50results about How to "Meet the dynamic requirements" patented technology

Disclosed is a structural dynamics design method of the rotor of an aerial engine. Based on the characteristics of the working status of a high propulsion ratio aerial engine, the structural dynamics design method of the rotor of the aerial engine presents the concept of thermal modal to adapt to structural dynamics design of the rotor of the aerial engine under variable working conditions. The structural dynamics design method of the rotor of the aerial engine is characterized by optimizing the parameters of the rotor and bearings, enabling the thermal modal of a rotor system to avoid the modal of the rotor under the absolute rigidity of the bearings, meanwhile, giving play to the effects of a damper and enabling the rotor system to meet the requirements of vibration standards in the thermal modal. The structural dynamics design method of the rotor of the aerial engine comprises taking the margin between the modal of the rotor with elastic bearings and the modal of the rotor under the absolute rigidity of the bearings as optimized parameters, meanwhile giving play to the damping effects of the damper to meet the dynamics requirements of the rotor system. The structural dynamics design method of the rotor of the aerial engine changes the traditional design concept of design first and checking calculation later and performs active design of the dynamics characteristics of the rotor to achieve circulating design, thereby improving the working efficiency and having significant engineering practical value.

The invention provides a power dividing method of a compound power source fuel cell hybrid energy system of an electric automobile. The method includes the steps that firstly, when a fuel cell is started, a fuel cell controller acquires the fuel cell voltage at the initial moment and the fuel cell current at the initial moment and acquires the fuel cell voltage and the compound power source voltage at every next moment; secondly, a discrete prediction model of the compound power source fuel cell hybrid energy system is established, and the power of the fuel cell at the next moment is determined; and thirdly, the reference output power of a storage battery at the next moment and the reference output power of a super capacitor at the next moment are further determined, and power division isachieved. By the adoption of the method, the demanded power of the whole automobile is optimized and divided, the defect that the fuel cell is slow in dynamic response is overcome, meanwhile power losses of a compound power source are reduced, the work efficiency of the compound power source is improved, the dynamic property requirement of the automobile is met, and the driving mileage of the automobile is increased.

The inventin discloses a protecting method in a projecting system comprising projection information transmitting end and projecting end, able to achieve static image and dynamic video display effect on the condition of limited transmission bandwidth. And it comprises the steps of: at the projection information transmitting end, analyzing the projection information to generate static picture information and dynamic picture information; transmitting them as data to the projecting end; at the projecting end, extracting them from the received data; and displaying them in the respective windows. And the invention can assure projected picture performance and effectively reduce CPU processing ability requirements.

The invention discloses a motor torque control method aiming at different driving modes. The motor torque control method aiming at the different driving modes comprises the following steps that (1) anaccelerator pedal position signal, an accelerator pedal change rate signal, a gear signal, a motor voltage signal and a battery SOC signal are acquired through a high-speed CAN bus to judge an immediate driving mode of a driver; the driving mode comprises an economic mode and a power mode; (2) the motor voltage signal is acquired, and initial motor target torque is determined according to the current voltage of a motor; and (3) the initial motor target torque is adjusted to final motor target torque according to the driving mode result judged in the step (1);and the final motor target torqueis the motor torque corresponding to a pedal working mode under the corresponding pedal opening under the specific working condition. According to the motor torque control method aiming at the different driving modes, the motor torque is rapidly adjusted according to the driving modes of a driver, the economical and dynamic requirements of the whole electric vehicle are met, and the endurance mileage of the whole vehicle and the output accuracy of the motor target torque are improved.

The invention provides an intelligent vehicle track lane changing planning method, which comprises the steps of acquiring road information, and fitting a current lane center line equation according tothe road information; judging the road shape according to the current lane center line equation, wherein the road shape comprises a straight road and a curved road, and the curved road comprises a fixed-curvature road and a variable-curvature road; determining the maximum lateral acceleration amax and lane changing time te in the lane changing process according to the road shape, the running state of the vehicle and obstacle information; inputting the lane changing time te, the running state of the vehicle and the obstacle information into a preset safe distance model, and judging whether a lane changing condition is met or not; and if so, planning a lane changing track according to the road shape and the lane changing time te. The track planning method provided by the invention meets thedynamics requirements of the vehicle, can guarantee the operation stability and the driving safety in the lane changing process, is suitable for various road shapes, and is higher in applicability.

The invention relates to a continuously adjustable mechanical hydraulic valve lift device which belongs to the technical field of internal combustion engine. The continuously adjustable mechanical hydraulic valve lift device comprises a valve cam, a valve, a valve spring, a plunger piston adjusting arm, a plunger piston spring base, a tappet plunger piston, a plunger piston spring, a tappet plunger barrel, a retaining nut, a low pressure oil cylinder, a first gasket, a second gasket, an executing plunger piston and an executing plunger barrel. The lift range is decided by the relative position of the tappet plunger piston and a first oil hole at the tappet plunger barrel. The symmetrical plane of the plunger piston adjusting arm is coincident with the symmetrical plane of a diclinic section at the head of the tappet plunger piston, and the symmetrical plane of the plunger piston adjusting arm along the axial line is considered as a reference plane. When maximum lift is required, the plunger piston adjusting arm is rotated to ensure that the reference plane is parallel with the axial line of the first oil hole. When minimum lift is required, the plunger piston adjusting arm is rotated to ensure that the reference plane is vertical to the axial line of the first oil hole. When medium lift is required, the plunger piston adjusting arm is rotated to ensure that the reference plane and the axial line of the first oil hole form any angle between 0 to 90 degrees. The device has simple structure and can adjust valve lift, valve right timing and duration continuously.

The invention discloses an electric vehicle power system with a hollow rotor motor and double-gear speed reduction with differential speed. The electric vehicle power system comprises a hollow rotor brushless direct current motor; a sun wheel hollow rotor of the hollow rotor brushless direct current motor is used as a sun wheel of a first-grade planetary speed reduction gear train and is used for carrying out power input; double-gear speed change is realized through a second-grade planetary speed reduction gear train; the sun wheel hollow rotor is provided with a through central hole, so that an axle shaft conveniently penetrates through the through central hole to carry out power transmission; the combination and separation of two groups of the planetary speed reduction gear trains are realized through driving a gear-shifting shift fork by a gear-shifting motor, so that the conversion of high and low speed ratios is realized; a differential speed function of output is realized through a bevel gear differential mechanism. According to the electric vehicle power system with a hollow rotor motor and double-gear speed reduction with differential speed, disclosed by the invention, high-frequency output of the motor is realized through double-gear speed reduction under different working conditions of the motor; meanwhile, the structure of the motor is optimized, the transmission efficiency is high, the structure is compact, the weight is light and the power system is convenient to mount and arrange.

The symmetrical admission and exhaust cam for three cylinder gasoline engine has profile line with the work section equation of h=(hmax-hr)(1+c2A2+c4A4+cpAp+cqAq+crAr+csAs), where, h is the lift of the cam work section, hmax is the maximum lift and equals to 7.3-7.5 mm, hr is the lift of cam buffer section and equals to 0.3-0.35 mm, A is cam angle, p, q, r and s are indexes, c4=0.1, p=14, q=28, r=42, and s=56. The cam has base circle diameter of 33 mm, contact width to the jib of 10 mm, total contact angle of 167-172 deg, work section angle of 121 deg, and buffer section angle of 46-52 deg. The symmetrical admission and exhaust cam has the advantages of capacity of reaching excellent dynamic characteristic of gasoline engine and smooth running of the valve mechanism, and small thickness.

The invention discloses a collaborative optimization energy management method of a parallel hybrid electric vehicle. The problem that the existing energy management control cannot meet the requirements of two aspects of real-time application and global optimization at the same time can be better solved; the advantages of dynamic planning and fuzzy control are combined; the invention further provides an off-line optimization decision support system, a globally optimal torque distribution strategy and a battery SOC trajectory are used as guidance, the optimal performance of a real-time controller is improved, a membership function and a fuzzy rule of a fuzzy controller are improved, and a high-performance real-time control strategy is obtained.

The invention discloses a current / frequency conversion circuit linearity and symmetry digital compensation method. The current / frequency conversion circuit linearity and symmetry digital compensation method comprises the steps of measuring and recording D trigger output pulse number and subdivided pulse number when different current values are input into a current / frequency conversion circuit; confirming conversion circuit linearity compensation factors and performing compensation to a conversion circuit output in digital mode; measuring and obtaining symmetrical coefficient and zero coefficient of the current / frequency conversion circuit; and confirming symmetrical compensation coefficient of the conversion circuit and performing real-time compensation to the conversion circuit output in digital mode. By means of the current / frequency conversion circuit linearity and symmetry digital compensation method, the problems including complicated operation, effective accuracy, high demands on debugging persons and unsatisfied batch production demand in the current production debugging process is effectively solved.

The invention provides a lithium iron phosphate battery state of charge (SOC) estimation method based on dynamic optimization forgetting factor recursive least square online identification. The method comprises the steps: carrying out segmented equal-interval discharge standing test on a lithium iron phosphate battery to obtain the curve relation between the open-circuit voltage and the state of charge of the lithium iron phosphate battery, carrying out particle swarm optimization on a forgetting factor, recurring a forgetting factor of a least square method, and estimating the SOC of the battery by combining optimized least square online identification and extended Kalman filtering. According to the method, the forgetting factor selected in real time can enable the terminal voltage following error to be extremely small so as to ensure the accuracy of parameter online identification, and the optimized forgetting factor recursive least square and extended Kalman filtering are combined to estimate the SOC of the lithium iron phosphate battery; and the combined estimation precision is high, and the dynamic requirements of combined estimation on forgetting factor values under different batteries and different battery use environments can be adapted.

The invention discloses an energy management system based on hierarchical control. The energy management system comprises a GPS module, a working condition prediction module, an energy management unit, an execution control unit and a battery state estimation unit, the GPS module sends a road condition information to the working condition prediction module, and the working condition prediction module comprises a driving working condition identification unit and a vehicle running state transition probability matrix. According to the energy management system, the hierarchical control principleis introduced so as to establish the pure electric vehicle capability management system, the system comprises two levels of control strategies, a top level strategy is an energy management strategy, aMarkov decision theory is used for establishing an energy optimization management model which is responsible for monitoring the energy flow of the whole pure electric vehicle power system, the targetpower of a motor is determined according to the current state of the system, a bottom level decision-making is the executive control unit, power distribution and motor control are carried out according to the current state of the system, so that the power requirements of the pure electric vehicle are met.

The invention discloses an online balancing device and method for a stranding machine. The device comprises the stranding machine and a portable dynamic balancing instrument, wherein a flywheel disc is concentrically assembled on a main shaft to form a main shaft flywheel rotation mechanism; two main shaft flywheel rotation mechanisms are symmetrically installed at the two sides of a rocking backet, a first end of the main shaft is connected with one side of the rocking backet through a first bearing, a second end of the main shaft is installed on a main shaft seat in a penetrating manner andthrough a second bearing, and the main shaft seat is fixed to a main machine support; during balancing, a probe is fixed to the main machine support, a measurement point of the probe and the main shaft are located at the same height and the measurement point of the probe is aligned with the main shaft at one side, and a magnetic vibration sensing head is placed at the middle position of the frontside of the main shaft seat at the same side; the probe and the magnetic vibration sensing head are connected to a dynamic balancing display separately; and online balancing for the stranding machineis realized by configuring an arc-shaped counter-weight sheet with a corresponding angle at a corresponding angle on the flywheel disc at the same side according to a measurement result which is displayed by the dynamic balancing display when the running speeds of the main shaft and the flywheel reach a set value.

The invention relates to an electric drive device with double motors and single planetary gear train. The electric drive device comprises a first drive motor (16), a planetary gear train (100), a second drive motor (13) and a wet clutch (104), wherein the planetary gear train (100 ) comprises a sun gear (101), a gear ring (102), a planet carrier (103) and a planetary gear train housing, the firstdrive motor (16) is connected with the sun gear (101), the gear ring (102) is fixedly connected with the planetary gear train housing, the second drive motor (13) is connected with the planet carrier(103), one end of the wet clutch (104) is connected with the sun gear (101), and the other end of the wet clutch (104) is connected with the planet carrier (103). Compared with the prior art, the electric drive device has the advantages that the electric drive device can realize two speed transmission without power interruption, achieve the purpose of decelerating and increasing the torque of thefirst driving motor and satisfy the power requirements of a vehicle, meanwhile complete the shifting process through the wet clutch, and achieve smooth shifting process, short shifting time and good driving comfort.

The invention discloses a parallel type hybrid power monorail crane control method. A cab, a hoisting beam, a track, a first anti-explosion container, a second anti-explosion container and a hydraulic driving part are included. The required torque in the driving process is Tr, and the optimal working interval of the torque is Te_min-Te_max; when Tr is smaller than Te_min, a pure motor driving mode is adopted; when Tr is larger than Te_min and smaller than Te_max, a pure fuel oil driving mode is adopted; and when Tr is greater than Te_max, a hybrid power driving mode is adopted. The two power sources of the diesel engine and the motor are arranged by combining the structural characteristics of the monorail crane, the whole vehicle is compact in structure and better in high-speed economical efficiency due to the parallel hybrid power connection mode, different driving modes are adopted according to different power requirements, stronger and more stable power can be provided, and the problems of insufficient power and the like of the monorail crane during urgent acceleration, steep slope climbing and high-speed running can be solved.

The invention relates to a truss structure of a spiral escalator, comprising an inner support structure, an outer support structure and a web connection structure, the inner support structure and the outer support structure are independent cylindrical structures or polygonal structures, The web connection structure is a connection structure between the inner support structure and the outer support structure. The truss structure of the spiral escalator is a closed structure, which does not need to be supported by the building structure; because the mechanics of the closed structure of the spiral escalator truss is optimized, it can save a lot of materials and has a relatively superior economic advantage; because the cylindrical structure itself is a A support structure, so the spiral escalator involved in this application is a closed structure and can be used as a support for building lifting frames.

The invention discloses an idle oxygen supply control method and system for a fuel cell system. It is obtained after the vehicle is in an idling state and the electric energy of the second energy storage device reaches the set value, the air compressor of the oxygen supply subsystem in the fuel cell system is input through the fuel cell stack to work at the set power P0 ACS Oxygen is supplied to the fuel cell stack, and the excess electric energy generated by the fuel cell stack is consumed, so that the fuel cell stack's output of electric energy to the vehicle is zero. When the vehicle is idling, the fuel cell stack is used to supply power to the oxygen supply subsystem to consume the excess electric energy of the stack, so that the power output of the fuel cell stack to the whole vehicle is zero, which not only ensures that the stack maintains a low power working state, Shut down to ensure the power performance of the vehicle.

The invention provides an NURBS curve interpolation method, comprising the steps of predicting parameters of a node at which an NURBS curve should arrive in a next period; performing velocity correction on the node parameters to enable a velocity error to be lower than a preset velocity threshold value; performing path correction on the node parameters to enable a path error to be lower than a preset path threshold value; and performing acceleration and jerk correction on the node parameters to enable an acceleration error to be lower than a preset acceleration threshold value and a jerk error to be lower than a preset jerk threshold value, thereby realizing curve interpolation. The invention also provides an NURBS interpolation device. By use of the method, processing requirements of high speed and high precision can be realized.

The invention provides a multi-mode continuously variable transmission with a rotating speed and torque coupling function. The multi-mode continuously variable transmission comprises an engine power input assembly, a hydraulic transmission assembly, a motor transmission assembly, a planetary gear assembly, an output component, a clutch component and a brake component, wherein the output end of theplanetary gear assembly is connected to the output component; the engine power input assembly, the hydraulic transmission assembly and the motor transmission assembly are connected to the input end of the planetary gear assembly through the clutch component; the engine power input assembly is connected to the hydraulic transmission assembly through the clutch component; and the clutch component and the brake component are used for providing a continuously changing transmission ratio of the engine power input assembly or / and the motor transmission assembly to the output component. Optimal power matching of a power source and optimal combination of power output modes can be achieved by switching the clutch component and the brake component and adjusting the displacement ratio of the hydraulic transmission assembly and the rotating speed / torque of a motor.

Disclosed is a structural dynamics design method of the rotor of an aerial engine. Based on the characteristics of the working status of a high propulsion ratio aerial engine, the structural dynamics design method of the rotor of the aerial engine presents the concept of thermal modal to adapt to structural dynamics design of the rotor of the aerial engine under variable working conditions. The structural dynamics design method of the rotor of the aerial engine is characterized by optimizing the parameters of the rotor and bearings, enabling the thermal modal of a rotor system to avoid the modal of the rotor under the absolute rigidity of the bearings, meanwhile, giving play to the effects of a damper and enabling the rotor system to meet the requirements of vibration standards in the thermal modal. The structural dynamics design method of the rotor of the aerial engine comprises taking the margin between the modal of the rotor with elastic bearings and the modal of the rotor under the absolute rigidity of the bearings as optimized parameters, meanwhile giving play to the damping effects of the damper to meet the dynamics requirements of the rotor system. The structural dynamics design method of the rotor of the aerial engine changes the traditional design concept of design first and checking calculation later and performs active design of the dynamics characteristics of the rotor to achieve circulating design, thereby improving the working efficiency and having significant engineering practical value.

The invention discloses a cantilever type rotor used for a backing turbine air blowing loss test and relates to a cantilever type rotor. The cantilever type rotor used for the backing turbine air blowing loss test solves the problems that in a traditional wheel disk and blade rotor test, cost is high, the period is long, and lubricating of bearing system structures at the two ends is relatively complicated. A forward vehicle moving blade (11) is installed on a turbine overall blade disk; a backing turbine blade (12) is installed on the forward vehicle moving blade (11) through a middle ring (13); the turbine overall blade disk, the forward vehicle moving blade (11), the middle ring (13) and the backing turbine blade (12) jointly form a backing turbine double-layer overall blade disk (1); one end of a backing turbine output shaft (2) is connected with the backing turbine double-layer overall blade disk (1) through a disk shaft connection pin (3), and one end of the backing turbine output shaft (2) is suspended; and the backing turbine double-layer overall blade disk (1) is located on the outer sides of two supporting bearing supporting points of a whole rotor. The cantilever type rotor is used for the backing turbine air blowing loss test

A lane change planning method for an intelligent vehicle trajectory proposed by the present invention includes: obtaining road information, and fitting the current lane centerline equation according to the road information; judging the road shape according to the current lane centerline equation, and the road shape includes straight roads and curved roads Roads, curved roads include fixed curvature roads and variable curvature roads; determine the maximum lateral acceleration a during the lane change process according to the road shape, the running state of the own vehicle, and obstacle information max and lane change time t e ; Change lane time t e , Input the running status and obstacle information of the self-vehicle into the preset safety distance model to judge whether the lane-changing conditions are met; if yes, then according to the road shape and the lane-changing time t e Plan the lane change trajectory. The trajectory planning method proposed by the invention satisfies the vehicle dynamics requirements, can ensure the handling stability and driving safety of the lane changing process, is applicable to various road shapes, and has stronger applicability.

The invention discloses a vehicle power output control method and a device. The method comprises the steps that when a unit coordination controller receives required power, the environment temperatureof the environment where a vehicle is located currently is obtained, a power mode corresponding to the environment temperature is determined, and a power output instruction containing the required power and power mode information is sent to a motor controller; and the motor controller is used for determining the engine rotating speed corresponding to the required power based on the power mode andsending the engine rotating speed to an engine controller, so that the engine controller controls an engine by utilizing the engine rotating speed to meet the power requirement of the vehicle; a unitcoordination controller is used for selecting a targeted power mode according to the using environment temperature of the whole vehicle and sending different power output instructions to the motor controller, and therefore the motor controller is used for selecting the rotating speed of the engine in a targeted mode according to the required power so as to meet the dynamic property requirement under the current environment temperature.

The invention discloses a method and system for reducing the influence of a speed error on integrated navigation precision in a lock losing process. The system comprises a global positioning system receiver, a micromechanical inertial measurement unit, a programmable logic controller, a digital signal processor and a CAN bus, the signal output end of the global positioning system receiver is connected with the signal input end of the programmable logic controller, the signal output end of the micromechanical inertial measurement unit is connected with the signal input end of the digital signal processor, the signal output end of the programmable logic controller is connected with the signal input end of the digital signal processor, and the signal output end of the digital signal processor is connected with the CAN bus. The method and system can obviously improve the navigation precision of an inertial navigation / global positioning satellite integrated navigation system in the lock losing state of a satellite.

The invention provides an integrated optimization algorithm for a dual-motor coupling driving system of an electric bus. An upper layer algorithm and a lower layer algorithm are respectively constructed by using a particle swarm optimization algorithm and a dynamic programming algorithm. According to the particle swarm optimization, particle coordinates represent to-be-optimized system parameters, the dynamic programming algorithm is used as a control strategy optimization algorithm under each particle, system power loss is used as a target function to optimize a control strategy of the coupling driving system, and it is guaranteed that each particle operates with the optimal control strategy. The obtained particles can reach the minimum power loss, weighted summation is carried out on the power loss and the power level to serve as an objective function of the particle swarm algorithm, and the particle coordinate corresponding to the minimum value of the objective function is sought by the particle swarm algorithm to serve as the optimal system parameter.

The invention discloses a vehicle power output control method and device, the method comprising: when the unit coordination controller receives the required power, acquires the ambient temperature of the environment where the vehicle is currently located, and determines the power mode corresponding to the ambient temperature , and send a power output instruction containing the required power and the power mode information to the motor controller; the motor controller determines the engine speed corresponding to the required power based on the power mode, and sends the engine controller to the engine controller speed, so that the engine controller uses the engine speed to control the engine to meet the power demand of the vehicle. The unit coordination controller selects a targeted power mode according to the ambient temperature of the vehicle, and sends different power output commands to the motor controller, so that the motor controller selects the engine speed in a targeted manner according to the required power to achieve the current ambient temperature The following dynamic requirements.

The invention provides an integrated optimization method for a dual-motor coupling drive system for an electric bus, wherein an upper layer and a lower layer algorithm are respectively constructed by using the particle swarm algorithm and the dynamic programming algorithm. Among them, the particle swarm algorithm uses the particle coordinates to represent the system parameters to be optimized, and uses the dynamic programming algorithm as the control strategy optimization algorithm under each particle to optimize the control strategy of the coupled drive system with the system power loss as the objective function. Each particle runs with the optimal control strategy, so that the minimum power loss that the obtained particle can achieve, and the weighted summation of the power loss and the power level is used as the objective function of the particle swarm optimization algorithm, and the particle swarm optimization algorithm seeks its objective function. The particle coordinate corresponding to the minimum value is the optimal system parameter.

The invention discloses a hybrid power coupling mechanism. An output shaft of an engine (1) is fixedly sleeved with a first sun wheel (2), the first sun wheel (2) is meshed with a first outer ring (5) through first planet gears (3), all the first planet gears (3) are arranged on one end face of a planet carrier (4), second planet gears (7) are arranged on the other end face of the planet carrier (4), and all the second planet gears (7) are meshed with a second outer ring (6) and a second sun wheel (8); a big gear wheel (9) is coaxially fixed to the second sun wheel (8) and meshed with a pinion (11), and the pinion (11) is arranged on a main shaft of an ISG motor (10) in a sleeved mode. According to the hybrid power coupling mechanism, the optimum driving form under different working conditions can be achieved, power performance demands can be met, and fuel economy can be effectively improved; the hybrid power coupling mechanism has the advantages of being simple and compact in structure, small in size, easy to assemble, low in production cost, convenient to control, little in power loss, good in reliability, and the like.

The invention discloses a current / frequency conversion circuit linearity and symmetry digital compensation method. The current / frequency conversion circuit linearity and symmetry digital compensation method comprises the steps of measuring and recording D trigger output pulse number and subdivided pulse number when different current values are input into a current / frequency conversion circuit; confirming conversion circuit linearity compensation factors and performing compensation to a conversion circuit output in digital mode; measuring and obtaining symmetrical coefficient and zero coefficient of the current / frequency conversion circuit; and confirming symmetrical compensation coefficient of the conversion circuit and performing real-time compensation to the conversion circuit output in digital mode. By means of the current / frequency conversion circuit linearity and symmetry digital compensation method, the problems including complicated operation, effective accuracy, high demands on debugging persons and unsatisfied batch production demand in the current production debugging process is effectively solved.