53results about How to "Avoid undervoltage" patented technology

The invention relates to a narrow amplitude satellite type flexographic plate printing machine which is characterized in that linear guide rails are adopted for ink transfer motion of an anilox roller and movement of a printing plate roller drum, the operation is lightweight and the printing precision is high; by setting an operation mechanism which can read data of a dial indicator for indicating the position of the printing plate roller drum, the technical difficulty in operation is reduced; the anilox roller is connected with a motor through a clutch, thereby avoiding the frequent cleaning problem in a workshop of the anilox roller; by using a back bucket type double-doctor ink supply device, the structure of an ink supply mechanism is greatly simplified, and the cost is greatly reduced; a central stamping roller drum is equipped with a water circulation cooling constant temperature system, thereby ensuring the printing quality; an ultraviolet drying device is provided with a power conversion energy-saving control circuit, thereby saving electrical energy; and an infrared drying device, a printing film covering device and a printing synchronous circular die-cutting device are arranged on the back side of the ultraviolet drying device after the last color of a printing group, thereby further saving the electrical energy, realizing synchronous multiple functions in one machine and reducing the cost. The narrow amplitude satellite type flexographic plate printing machine is applicable to water-based ink printing, and can avoid polluting commodities and causing harm to health of people, and is environment-friendly.

Disclosed are a power management system and a state estimation method based on mining lithium ion batteries. The power management system based on a mining lithium ion battery set composed of a plurality of single lithium batteries comprises a master control unit, a single-bus temperature acquisition unit, a power management unit, a current acquisition unit, a control unit and a data transmission unit; the system allows overvoltage-undervoltage protection, overcurrent protection, overtemperature protection, charge balance management, capacity self-check and real-time uploading and correction of running parameters. The state estimation method based on a Gaussian process inference learning method is characterized in that sparse Gaussian process and Gaussian process are processed by a hypothesis density filter, strategy noise, system noise and model uncertainty are considered, filtering and prediction operating are performed at computation cost by means of the analytical method, and a non-stationary dynamic system is easy to model. Applicative effects show that the power management system and a state estimation model have the effect of ensuring operational security and efficiency of mining batteries, and energy utilization rate of the batteries is maximized.

The invention relates to a medium-sized pure electric bus chassis which comprises a chassis body, a first front wheel, a second front wheel, a first rear wheel, a second rear wheel, a front axle and a rear axle, wherein the first front wheel, the second front wheel, the first rear wheel, the second rear wheel, the front axle and the rear axle are arranged on the chassis body, the front axle is arranged between the first front wheel and the second front wheel, and the rear axle is arranged between the first rear wheel and the second rear wheel. An electric steering system, a power source system, a driving system, a control system and a brake system are arranged on the chassis body. The electric steering system is positioned in the front section of the chassis body, the power source system is positioned in the middle section of the chassis body, the driving system and the control system are positioned in the rear section of the chassis body, and the brake system is distributed on the whole chassis body in a penetrating manner. Electric energy serves as a power source, the power performance and safety of a power system can be ensured when a bus runs, and zero emission, energy conservation and environmental protection can be realized.

The invention discloses a real-time asphalt road compactness monitoring method which comprises the steps of (1) establishing a linear relation between compactness and detection density of a non-nuclear density gauge; (2) establishing a linear relation between a compaction value and the compactness; (3) according to the lower compactness limit requirement of a construction site and according to the linear relation between the compaction value and the compactness, established in the step (2), determining the lower limit of the compaction value; (4) monitoring the compactness in construction in real time, enabling an vibratory roller operator to control a vibratory roller through observing the compacted or uncompacted information displayed on an industrial control computer, continuously rolling when in uncompaction, and stopping rolling when in compaction. The real-time asphalt road compactness monitoring method is novel and reasonable in design, convenient to realize, capable of improving the compaction quality and efficiency of an asphalt road and avoiding damage to the road, relatively high in compactness detection accuracy, low in realization cost, strong in practicability, and high in popularization and application values.

The invention discloses a method, a device and a system for estimating the peak power of a battery pack. The method comprises the following steps of obtaining a discharge power limit value and a charging power limit value of the battery pack according to the charged state of the batteries in the battery pack and the temperature of the battery pack; acquiring the minimum voltage value and the maximum voltage value of the batteries in the battery pack, and determining the discharge peak power limit coefficient and the charging peak power limit coefficient based on the preset voltage limit condition, the minimum voltage value and the maximum voltage value; and calculating the discharge peak power of the battery pack and the charging peak power of the battery pack based on the discharge power limit value, the charging power limit value, the discharge peak power limit coefficient and the charging peak power limit coefficient. According to the method of estimating the peak power of the battery pack provided by the embodiment of the present invention, it is possible to adjust the peak power of the batteries in the battery pack by the battery voltage so as to avoid the risk of undervoltage or overvoltage during discharge or charging of the peak power.

The invention discloses an automatic tire charging control device, which comprises a power supply, a MCU (microprocessor control unit), an LCD screen, a control panel, an illumination lamp, a backlight lamp, an electric control valve, a limit switch, a manual charge switch, a pressure sensor, a buzzer, an LED state indicator lamp, a manual exhaust valve, and an air pressure input and output interfaces. The device can be used for charging a tire respectively by using two control air paths for manual charging and automatic charging. Before the preparation for automatic charging, the charging pressure of the device is preset and the charging process can be controlled in real time, thus achieving timely detection of set pressure, discharge and accurate electronic metering for the automatic charging process, preventing the occurrence of overpressure or underpressure, and achieving pressure setting, measurement and accuracy control of the charging process to meet the charging requirement of different tires. The device may also be used for other occasions requiring accurate charging other than tires.

The invention relates to a rolling construction monitoring system and a rolling construction monitoring method. Construction sections are divided in a construction area according to a design requirement, at least one construction section is set according to the design requirement, at least one construction roller is configured in each construction section, an RTK base station and a construction data processing mechanism are arranged in the construction area, a vehicle GPS mobile station is arranged on each construction roller, the RTK base station, the vehicle GPS mobile station and a GNSS satellite form a positioning system, and the rolling construction monitoring system is formed by the positioning system, the construction rollers, vehicle displays, vehicle controllers, the construction data processing mechanism, operation monitoring clients, and rolling degree detectors. According to the system and the method, the structure is simple, the design is scientific, the usage is convenient, the cost is low, the grasp is easy, monitoring data is accurate, the transmission is fast, the usage of equipment is long and durable, continuous, real-time and accurate rolling construction monitoring and rolling degree detection can be performed, and comprehensive control of the rolling process and the rolling quality is achieved.

The invention discloses a Bluetooth door opening method based on mobile terminal APP and a door lock. The Bluetooth door opening method comprises the following steps: a, awakening a system; b, opening a door by utilizing administrator login APP or APP entering temporary password, going to a step d if the administrator login APP is utilized for opening the door, and going to a step c if the APP entering temporary password is utilized for opening the door; c, firstly carrying out administrator login by virtue of APP, inputting a seed character string by an administrator, carrying out internal verification algorithm encryption on the seed character string to obtain a result character string, taking the result character string as the temporary password, inputting the temporary password into the mobile terminal APP, calling an internal verification algorithm for verifying the temporary password, and opening the door if verification is successful; and d, searching peripheral Bluetooth by virtue of secondary Bluetooth, acquiring a Bluetooth physical address designated for opening the door and storing the Bluetooth physical address into a memory chip, exiting administrator login, then searching peripheral Bluetooth equipment by virtue of primary Bluetooth, comparing a search result with the stored Bluetooth physical address, and opening the door if the search result is matched with the stored Bluetooth physical address. The door lock disclosed by the invention is not only low in power consumption and convenient to mount but also high in safety and can assist door opening remotely.

The invention relates to a hybrid power automobile, a battery electric quantity balance control method and a control system. During the operation of the hybrid power vehicle, when the battery electricquantity is reduced to a low set threshold value, the power generation power of a generator is increased, as the output power of a driving motor is kept unchanged or only floats in a small range, then the power generation power of the generator and the output power of the driving motor have a certain difference, and thus the electric quantity is saved, and the electric quantity is used for recharging the battery; and when the electric quantity of the battery increases to a high set threshold value, the power generation power of the generator is controlled to be switched to the value before the increase, and thus the consistency of input and output is realized, and the electric quantity of the battery is ensured to be stable in a balanced state. Therefore, the power generation quantity ofthe generator and the power consumption of the driving motor are dynamically coordinated and controlled, so that the electric quantity balance under multiple working conditions can be realized, the situations that the electric quantity cannot be balanced such as under-voltage and over-voltage of the battery are avoided, and the service life of the battery is prolonged.

The invention relates to the technical field of shield tunnel automatic control, and particularly relates to a shield tunnel remote automatic control device. The shield tunnel remote automatic control device comprises a man-machine interface, a PLC, the Ethernet, frequency converters and cutter motors, wherein the man-machine interface is connected with the PLC through the Ethernet, the six frequency converters are respectively connected with the six cutter motors through cables, the cutter motors are connected to a cutter driving big gear through a reducer, the PLC comprises a control station PLC and a work station PLC, the control station PLC is installed in an operating room, the control station PLC is connected with the work station PLC through an NETH / H network, the work station PLC is connected with the frequency converters through an R485 bus, the six frequency converters are connected with a pulse distributor, and the pulse distributor is connected with the work station PLC through an RTD100S encoders. The device can be remotely operated, is simple and reliable in control mode and has the characteristics of the maximum openness and flexibility.

The invention provides a power supply port protective circuit. The power supply port protective circuit comprises a first low-loss power device, a second low-loss power device, a reverse-connection protective circuit, an undervoltage protective circuit, an overvoltage protective circuit and an overcurrent protective circuit, wherein the first end of the first low-loss power device is connected with a power supply input end while the second end of the first low-loss power device is connected with the first end of the second low-loss power device; the second end of the second low-loss power device is connected with the input end of a to-be-protected power supply port; the reverse-connection protective circuit is connected with the third end of the first low-loss power device and the power supply input end separately; and the undervoltage protective circuit, the overvoltage protective circuit and the overcurrent protective circuit are all connected with the second end of the first low-loss power device, the second end of the second low-loss power device and the third end of the second low-loss power device separately. By adoption of the abovementioned way, conditions of reverse connection, overvoltage, undervoltage and overcurrent and the like of the power supply port can be avoided, thereby improving operational reliability of the system.

The invention discloses a roadbed compaction quality detection method and system based on modal parameter identification, and the method comprises the steps: obtaining position information and a vibration signal in a compaction operation process of a road roller, carrying out the frequency domain analysis, and obtaining a frequency domain signal; identifying the system inherent frequency of the road roller-soil body vibration system in the frequency domain signal through a modal parameter identification method, judging the change of the rigidity of the road roller-soil body vibration system through the change of the system inherent frequency of the road roller-soil body vibration system, and judging the change of the compaction quality of the compacted body through the change of the systemrigidity of the road roller-soil body vibration system. Continuous, accurate and real-time compactness detection is carried out on the roadbed, the compactness quality of each point is effectively reflected, and the roadbed compactness quality is truly judged.

The invention discloses an automobile and an automobile power supply system dormancy control circuit. The automobile power supply system dormancy control circuit comprises a start power supply, a BMS(Battery Management System) main engine, at least one BMS slave engine, a CAN bus, at least one power supply voltage detection unit and at least one slave engine power supply management unit, whereinthe slave engine power supply management units are connected between the corresponding BMS slave engines and the start power supply; the BMS main engine enters a start state and a dormancy state according to start signals and stop signals of the automobile and controls power supply and power cutoff for the CAN bus; and according to the power supply voltage of the CAN bus, the slave engine power supply management unit controls power on or power off of the connected BMS slave engine. According to the start or stop state of the automobile, the BMS main engine controls power supply of all BMS slave engines, all slave engine modules are power-off and dormant in a condition in which the automobile stops and is not used, once the automobile starts, the main engine then wakes up all slave engine modules to work normally, the power consumption of the system is greatly reduced, and under voltage or insufficient capacity of the start power supply is avoided.

Disclosed are a power management system and a state estimation method based on mining lithium ion batteries. The power management system based on a mining lithium ion battery set composed of a plurality of single lithium batteries comprises a master control unit, a single-bus temperature acquisition unit, a power management unit, a current acquisition unit, a control unit and a data transmission unit; the system allows overvoltage-undervoltage protection, overcurrent protection, overtemperature protection, charge balance management, capacity self-check and real-time uploading and correction of running parameters. The state estimation method based on a Gaussian process inference learning method is characterized in that sparse Gaussian process and Gaussian process are processed by a hypothesis density filter, strategy noise, system noise and model uncertainty are considered, filtering and prediction operating are performed at computation cost by means of the analytical method, and a non-stationary dynamic system is easy to model. Applicative effects show that the power management system and a state estimation model have the effect of ensuring operational security and efficiency of mining batteries, and energy utilization rate of the batteries is maximized.

The invention discloses an electronic shift lever circuit of a manual adjustment and automatic adjustment integrated gearbox. The electronic shift lever circuit comprises a vehicle-mounted direct-current power source feedback circuit unit, a P-gear acquisition circuit unit, a lock control signal acquisition circuit unit, a gear indicting circuit unit, a processor unit, an ESD protective circuit unit, an LIN transceiver unit, an LIN signal filtering unit and a power source unit. The five output ends of the processor unit are connected with the control ends of controllable switching circuit units of a P-gear driving circuit unit, an R-gear driving circuit unit, a N-gear driving circuit unit, a D-gear driving circuit unit and a M-gear driving circuit unit correspondingly through the ESD protective circuit unit; and the vehicle-mounted direct-current power source feedback circuit unit, the P-gear acquisition circuit unit and the lock control signal acquisition circuit unit are connected with the input end of the processor unit through the ESD protective circuit unit, the data end of the processor unit is connected with the RXD end and the TXD end of the LIN transceiver unit, and the LIN end of the LIN transceiver unit is connected with the LIN signal filtering unit and used for being connected with a controller of the gearbox.

The present invention discloses a method and an apparatus for monitoring the number of rolling passes of a roller and determining whether the rolling is qualified. The present invention belongs to thefield of road construction, and particularly relates to a method for monitoring the number of rolling passes of a roller and determining whether the rolling is qualified. The method comprises: S1: determining a range of each lane of a road section constructed by using a roller, and dividing each lane into cells; S2: calculating the number of rolling passes of each cell; S3: determining whether the number of rolling passes of the cell is qualified; and S4: determining whether the rolling overlap width between adjacent lanes meets the requirements. According to the technical scheme provided bythe present invention, the number of rolling passes of cells of each lane is monitored in real time, and the number of rolling passes of the lane is monitored to prevent missing rolling or excessive rolling and improve the rolling quality.

The invention provides a battery cell equalization method and a battery management system. The method comprises the following steps: acquiring the battery cell equalization temperature of an automobile and the battery cell states of all the battery cells when the automobile is in a starting state; based on the battery cell equalization temperature and the battery cell state of each battery cell, determining whether the automobile needs to be subjected to battery cell equalization or not; if the automobile needs to be subjected to battery cell equalization, determining to-be-equalized battery cells needing to be equalized in all the battery cells by utilizing the voltage of each battery cell; and equalizing all the to-be-equalized battery cells. According to a scheme in the invention, whenthe automobile is in the starting state, whether the automobile needs to be subjected to battery cell equalization or not is determined according to the battery cell equalization temperature and the battery cell state; and if so, the to-be-equalized battery cells required to be equalized are determined and are equalized, so undervoltage of a battery caused by multiple self-awakening of the batterymanagement system after the automobile is shut down is avoided, normal starting of the automobile is guaranteed, and the use experience of the automobile is improved.

The invention discloses a motor protector. The motor protector comprises a single chip microcomputer control unit and a display screen which is electrically connected with the single chip microcomputer control unit, wherein the single chip microcomputer control unit is connected with a current transformer, a voltage transformer, a Hall sensor, a temperature sensor, a voice alarm module, a wireless transmission module, a lightning protection module, an air switch, an electric leakage protector, an automatic transformer, a magnetic field detection coil and a thermal relay at the same time. The motor protector is reasonable in design, capable of effectively protecting a three-phase motor by detecting the voltage, current, temperature and bearing position information, and high in precision, reliable in operation, and high in stability; various lines of motor operating parameters can be displayed on the display screen, so that an operator can analyze reasons; in addition, the motor operating parameters can be fed back in a remote manner through the wireless transmission module, so that the motor protector can be controlled more conveniently; and moreover, the operating voltages at the two ends of the motor can be automatically regulated through the automatic transformer to prevent undervoltage and overvoltage, thereby prolonging the service life of the motor.

The invention relates to a device capable of indicating the packing compression status of a valve stem. The device comprises a fastening part, a compressioncover, an elastic assembly, a packing compression cylinder and a guide cylinder, wherein one end of the packing compression cylinder acts onto the compression packing in a packing box, the guide cylinder is fixed to the other end of the packing compression cylinder, the elastic assembly is sleeved onto the guide cylinder, one end of the elastic assembly contacts with the packing compression cylinder, the other end of the elastic assembly contacts with the lower end surface of the compression cover, and the fastening part is fixed on the compression cover and acts onto the compression packing in the packing box through the compression cover, the elastic assembly and the packing compression cylinder. The device further comprises an indication assembly which comprises an annular groove arranged on the guide cylinder and a pointer arranged on the upper end surface of the compression cover. The device solves the technical problem that the existing device does not have the indication assembly and cannot indicate the packing compression status, and can provide clear information whether the packing compression status is appropriate in order to prevent overpressure or pressure shortage of the packing and prolong service life and maintenance period of the packing.

The invention discloses a power balancing method for a single power battery for a vehicle. The method is applied to a battery management system, so that the power of the single power battery can be kept within a range of SOC<AVE>+ / -eta. According to the performance attributes of the power battery, eta2 is smaller than eta1 at the first half stage of a life cycle of the vehicle, the power of the single power battery can be kept within a range of SOC<AVE>+ / -eta1 through balancing, the power consumed for balancing the power management system is the power designed by power battery redundancy, and the requirements of the vehicle on the power of the battery are not affected by balancing. At a later half stage of the life cycle of the vehicle, eta2 is greater than eta1, the power of the single power battery can be kept within a range of SOC<AVE>+ / -eta2 through balancing, the condition that the power deviation of the single battery does not exceed the consistent characteristic is ensured by the balancing function, the phenomena of accelerated ageing, under voltage and zero voltage of individual single battery can be avoided, the power battery meets the requirements of the vehicle on energy, and the consistent characteristic is also ensured, so that the balancing target is more explicit.

The invention provides a storage battery pack sampling line breakage detection device and a storage battery pack sampling line breakage detection method. The line breakage detection device comprises acurrent-limiting resistor module which comprises n current-limiting resistors and a reference current-limiting resistor, a divider resistor module comprising n divider resistors, detection switch modules in which each detection switch is provided with one end connected with the corresponding divider resistor and provided with the other end connected with the corresponding current-limiting resistor and the divider resistor corresponding to the adjacent high-node single battery, a switching resistor module comprising n switching resistor units, a voltage acquisition module each used for singlebattery voltage acquisition and voltage real-time diagnosis, a comparison and judgment module used for turning off a corresponding switching tube when judging that the voltage of the single battery isgreater than a preset reference voltage, and a microprocessor used for controlling the on-off of the detection switches, calculating a theoretical diagnosis voltage, and judging that a correspondingacquisition line is in a broken line state when judging that the real-time diagnosis voltage is not in the error range of the corresponding theoretical diagnosis voltage.

The invention relates to a disassembling and assembling auxiliary tool, in particular to a floating-type disassembling and assembling machine for inspection and maintenance of a single-rotating-arm wheel-set axle box of a rail vehicle. The floating-type disassembling and assembling machine comprises a chassis, a load-carrying frame and a pressing head, guiding stand columns are fixedly arranged on the left side and the right side of the chassis respectively, the load-carrying frame comprises a base and sliding stand columns arranged on the left side and the right side of the base, each sliding stand column is connected with the corresponding guiding stand column in an internally and externally sliding and matched mode, the base is fixedly installed between the sliding stand columns on the two sides, and the pressing head is located over the base; a hydraulic or pneumatic cylinder and a hydraulic or pneumatic cylinder seat are vertically arranged on the pressing head, the hydraulic or pneumatic cylinder seat is fixedly installed between the sliding stand columns on the two sides, and vertical guiding mechanisms are arranged on the front side and the rear side of the hydraulic or pneumatic cylinder in parallel to be connected with the pressing head. The floating-type disassembling and assembling machine further comprises a hydraulic or pneumatic station and an electrical control unit which are arranged on the chassis, the hydraulic or pneumatic cylinder is connected with the hydraulic or pneumatic station through a hydraulic pipeline, and the electrical control unit comprises a starting unit and a control unit. According to the floating-type disassembling and assembling machine for inspection and maintenance of the single-rotating-arm wheel-set axle box of the rail vehicle, mechanical, electrical and hydraulic integrated control of the inspection and maintenance process is achieved, the work efficiency is greatly improved, the labor intensity of workers is reduced, and the inspection and maintenance technology is obviously improved.

The invention discloses a rasterization-based unmanned road roller operation path planning method and system. The method comprises the following steps of performing rasterization processing on a construction layer pavement plane; designing a road roller circulation route; acquiring position information of the road roller in a construction layer pavement plane in real time, constructing a road roller motion model, and controlling the road roller to perform construction operation according to a circulating route mode; rolling compaction information of each grid is obtained, the rolling compaction condition of the grids is judged, and when the grids meet the rolling compaction process requirements, the road roller does not roll the grids any more. The unmanned road roller operation path planning system is used for executing the path planning method. The compaction information of the grids is obtained in real time through rasterization, and the compaction quality of the construction area can be effectively monitored; according to the method, route planning guidance is carried out on the unmanned road roller in the dimension of compaction quality, the problems of underpressure, overpressure and the like are avoided, the pavement compaction quality can be ensured, and the re-compaction level is further improved.

The invention relates to a narrow amplitude satellite type flexographic plate printing machine which is characterized in that linear guide rails are adopted for ink transfer motion of an anilox roller and movement of a printing plate roller drum, the operation is lightweight and the printing precision is high; by setting an operation mechanism which can read data of a dial indicator for indicating the position of the printing plate roller drum, the technical difficulty in operation is reduced; the anilox roller is connected with a motor through a clutch, thereby avoiding the frequent cleaningproblem in a workshop of the anilox roller; by using a back bucket type double-doctor ink supply device, the structure of an ink supply mechanism is greatly simplified, and the cost is greatly reduced; a central stamping roller drum is equipped with a water circulation cooling constant temperature system, thereby ensuring the printing quality; an ultraviolet drying device is provided with a powerconversion energy-saving control circuit, thereby saving electrical energy; and an infrared drying device, a printing film covering device and a printing synchronous circular die-cutting device are arranged on the back side of the ultraviolet drying device after the last color of a printing group, thereby further saving the electrical energy, realizing synchronous multiple functions in one machine and reducing the cost. The narrow amplitude satellite type flexographic plate printing machine is applicable to water-based ink printing, and can avoid polluting commodities and causing harm to health of people, and is environment-friendly.

Disclosed is a method and a battery management system for estimating the parameters of an equivalent circuit model for a battery. The equivalent circuit model includes a first resistor, a second resistor connected in series to the first resistor and a capacitor connected in parallel to the second resistor. The method according to an embodiment of the present disclosure individually estimates the resistance of the first resistor and the resistance of the second resistor based on a first number of terminal voltages and a first number of currents measured in a sequential order at each time step in a sliding time window having a predefined size, and stores data indicating the estimated results in the memory.

The invention belongs to the technical field of illumination and particularly relates to an LED (Light-emitting Diode) drive circuit and a mine explosion-proof lamp. The LED drive circuit provided by the invention comprises a drive module, a mine battery protector, a storage battery, a current-limiting module and an overcurrent and overvoltage protection module. According to the LED drive circuit, electric energy stored in the storage battery is utilized for supplying power to the whole LED drive circuit, and the mine battery protector is adopted to protect the battery, so that the battery is prevented from the phenomena such as overvoltage, undervoltage, overcurent or short circuit; in addition, the overcurrent and overvoltage protection module is utilized to disconnect a power supply loop under a condition that overcurrent and overvoltage occur; meanwhile, diodes in the current-limiting module are utilized to limit currents output by the storage battery; furthermore, the drive module only outputs currents which are less than one third of the rated working current of an LED module. Since the whole circuit has high safety, the mine explosion-proof lamp adopts a light shell, so that the portability of the mine explosion-proof lamp is enhanced.

The invention discloses a roadbed compaction quality detection method and system based on modal parameter identification, and the method comprises the steps: obtaining position information and a vibration signal in a compaction operation process of a road roller, carrying out the frequency domain analysis, and obtaining a frequency domain signal; identifying the system inherent frequency of the road roller-soil body vibration system in the frequency domain signal through a modal parameter identification method, judging the change of the rigidity of the road roller-soil body vibration system through the change of the system inherent frequency of the road roller-soil body vibration system, and judging the change of the compaction quality of the compacted body through the change of the systemrigidity of the road roller-soil body vibration system. Continuous, accurate and real-time compactness detection is carried out on the roadbed, the compactness quality of each point is effectively reflected, and the roadbed compactness quality is truly judged.

The invention discloses a method for detecting transverse compactness and uniformity of a roadbed. The method comprises the steps that before a roadbed to be compacted is compacted, whether a first linear regression equation K = aF<SE> + b and a second linear regression equation s = cI<n> + d can be obtained or not is judged, wherein in the formulas, K is the transverse compactness, F<SE> is the resultant force of the counter force of a compacted layer, s is a transverse compactness uniformity parameter, and I<n> is a transverse uniformity index; if yes, the first linear regression equation and the second linear regression equation are obtained; acceleration information of a road roller is acquired in the process of compacting the roadbed to be compacted; the resultant force of the counter force of the compacted layer and the transverse uniformity index of the compacted layer are calculated according to a calculation rule and the acceleration information; and the transverse compactness of the roadbed to be compacted is determined according to the resultant force of the counter force of the compacted layer and the first linear regression equation, and the transverse compactness uniformity parameter of the roadbed to be compacted is determined according to the transverse uniformity index of the compacted layer and the second linear regression equation. According to the method, the transverse compactness and uniformity of the roadbed can be detected in real time.

The embodiment of the invention discloses a road roller facing system. The road roller facing system comprises: a non-contact distance measuring device used for collecting a first distance between a front wheel edge of a road roller and a roadside edge and a second distance between a rear wheel edge and the roadside edge; a contact type distance measuring device used for collecting a third distance between the front wheel edge of the road roller and the roadside edge and a fourth distance between the rear wheel edge and the roadside edge; an angle sensor used for collecting the rotation angle of the road roller; a vehicle speed sensor used for collecting the vehicle speed of the road roller; and a display controller used for adjusting the turning angle and the vehicle speed of the road roller according to the first distance, the second distance, the third distance, the fourth distance, the turning angle and the vehicle speed to make the road roller run along the edge. According to the invention, the automatic welt compaction of the road roller is realized, the operation of a driver is not needed, the requirement on the operation skill of the driver is reduced, the welt compaction safety and the road edge construction quality are effectively improved, and the phenomena of underpressure and slag falling are avoided.

The invention discloses a multi-lifting platform control system and method, and the system comprises a power module, a switching module and a plurality of control modules for controlling lifting of the corresponding lifting platforms, wherein the switching module is used for connecting the plurality of control modules; the power module is connected to the plurality of control modules for supplyingpower to the plurality of control modules at the same time; a control module detects the running state of the other control modules through the switching module, and the control module is not workingwhen being set to detect that the other control modules are in the working state. The multi-lifting platform control system and method provided by the invention realize the connection between the plurality of control modules through the switching module, so that a single power module can supply power to the plurality of control modules at the same time with no need to set a corresponding power module for each control module, thereby saving power resources and reducing the cost of the multi-lifting platform control system.