47 results about "Hybrid electric bus" patented technology

The invention discloses a hybrid electric bus energy management method based on a random operation condition model. The method comprises the following implementation steps of: 1) obtaining a historical speed-displacement relationship and an acceleration-displacement relationship according to the historical speed of the bus, obtaining the historical average speed and average acceleration on each displacement point on the running path, and obtaining a speed random factor of the bus on each displacement point according to the variance of the historical speed; 2) obtaining the power need within a certain prediction displacement section after the current displacement point, obtaining a historical motor power change range within the certain prediction displacement section after the current displacement point of the bus, and obtaining a power distribution ratio range of the current displacement point; and 3) obtaining the optimal distribution ratio of hybrid power, and controlling the output states of an engine and a motor according to the optimal distribution ratio. The method disclosed by the invention has the advantages of reasonable energy distribution, good fuel economy, little exhaust emission, good robustness, energy conservation and environmental friendliness.

The invention relates to a method for cooperatively controlling an air pressure and regenerative brake of a hybrid electric bus, which belongs to the technical field of new-energy vehicles. The method comprises the following steps of: firstly, collecting a current air pressure brake force, a brake pedal travel, a brake pedal travel speed, battery information, motor information and vehicle state information of a hybrid electric bus; secondly, distributing the air pressure brake force and a motor brake force by utilizing a regenerative brake force distribution algorithm; thirdly, cooperatively controlling regenerative brake and an ABS (Antilock Brake System) by utilizing a regenerative brake and ABS cooperative control algorithm; and fourthly, compensating and controlling the air pressure brake force by utilizing an air pressure brake force compensation control algorithm. By utilizing the invention, part resources of the common air pressure brake system and the regenerative brake system of the hybrid electric bus can be fully utilized, the brake energy can be recycled to the maximum extent, the economical efficiency of the entire bus is enhanced, and wheels can be prevented from locking so that the brake safety of the entire bus is improved.

The invention discloses a test bed of an air pressure and regenerative braking coordinated control system of a hybrid electric bus, comprising an air pressure and regenerative braking control coordinated control test system, an air brake test system, a data processing system, a model simulation experimental system and a motor braking test system, wherein an air brake system and a brake air pressure regulating device in the air brake test system are subjects, and characteristic test can be carried out by replacing different pressure regulating devices; a motor and a battery in the motor braking test system are subjects, and energy recovery and charging of a battery pack can be realized in braking; and the sensor signal is inputted in a vehicle model of the model simulation experimental system through the data processing system, the vehicle model sends out control commands to the motor and a solenoid valve according to the collected information so as to lead the motor and the solenoid valve to be in the desired state. The test bed can perform overall performance test for the air pressure and generative braking coordinated control system of the hybrid electric bus including hardware and control strategy.

The invention discloses a simulation system and method for a plug-in hybrid electric bus. The method comprises the steps that a first user layer leads received parameters in a functional layer used for parameter selection, and a second user layer leads received parameters in a functional layer used for performance analysis; the functional layer used for the parameter selection determines the feasible value range of the component parameters to be selected after receiving the parameters received by the first user layer and then selects optimization modes according to whether selective parameter combinations can be determined or not; the functional layer used for the performance analysis receives the parameters received by the second user layer and leads the parameters in a core layer; the functional layers call a finished bus simulation model of the core layer and a control strategy for simulation after determining the optimization modes and transmit the final results to the corresponding user layers for display. According to the simulation system and method for the plug-in hybrid electric bus, the parameter selection and optimization of the key components of a power assembly and the analysis and prediction of the performance of the finished bus are achieved.

The invention discloses an energy distribution method for a single-shaft parallel-connection hybrid electric bus. A set of road conditions is set according to the bus speed-time historical statistics information of the city bus, and a corresponding set of optimization control parameters is set according to each road condition; driving parameters are collected automatically in the driving process of the bus, the corresponding road condition is judged, a whole bus controller takes the corresponding optimization control parameter and energy distribution mode, and torque output and energy recovery of a motor and an engine of the bus are optimized and adjusted. The energy resources of the single-shaft parallel-connection hybrid electric bus running in a city can be reasonably distributed, and under the condition that an AMT gearbox is carried, the power performance of the whole bus is satisfied. More importantly, fuel consumption and discharge of pollutants are effectively reduced, and fuel economy is improved.

Disclosed are an engine cooling method and an engine cooling system device for hybrid electric buses. According to the method, electronic fans are used to cool an engine; engine outgoing water temperature and engine incoming gas temperature are controlled precisely in real time through the hierarchical logic control of the electronic fans. In the hierarchical logic control of the electronic fans, two electronic fan sets, namely a first electronic fan set and a second electronic fan set, are used; a bus controller outputs a control signal group to control start and stop of the first electronic fan set; the bus controller outputs a second control signal group to control start and stop of the second electronic fan set. The hierarchical control of the electronic fans is characterized in that the first electronic fan set is started in a delayed manner and stopped with priority, and the second electronic fan set is started with priority and stopped in a delayed manner. The engine cooling method and the engine cooling system device for hybrid electric buses have the advantages that radiating performance of the engine can be optimized, the service lives of the electronic fans can be prolonged, the auxiliary heating function is provided for the stage IV postprocessing system and the emission of harmful gases such as nitric oxide from the engine is reduced.

The invention relates to a control method of a double-source auxiliary braking control system for a hybrid electric bus. The control system comprises an inverter, a retarder controller, a power battery, an auxiliary braking device, a braking pedal, a vehicle speed sensor, a complete vehicle controller and a storage battery. The auxiliary braking device comprises a motor and a retarder; the input end and the output end of the vehicle controller are connected with the inverter, the retarder controller and the power battery in an interaction mode, and the input end of the complete vehicle controller is connected with the braking pedal and the output end of the vehicle speed sensor separately; the direct current side of the inverter is connected with the positive electrode and the negative electrode of the power battery, and the indirect current side of the inverter is connected with the motor; the direct current side of the retarder controller is connected with the positive electrode of the storage battery, and the signal output end of the retarder controller is connected with the retarder. Accordingly, the heat fading phenomenon caused by long-time working of service braking after motor auxiliary braking exits can be avoided, the braking safety problem of the hybrid electric bus is fundamentally solved, and the safety and the reliability of the complete vehicle are improved.

The invention discloses an AMT clutch control system and method of a single-shaft parallel hybrid electric vehicle. The AMT clutch control system and method are provided for a special structure on a hybrid electric bus, the speed adjusting functions of an engine and a motor during a clutch combining process are fully used, comfort is guaranteed, meanwhile, gear shifting time is shortened, abrasion of a clutch caused by film sliding is lowered, accordingly, the service life of the clutch is prolonged, and the contradiction of the impact degree and film sliding work is effectively resolved. Meanwhile, impact on people during a gear shifting process can be greatly reduced, and the comfort of passengers is improved.

The invention discloses a radiator assembly for a hybrid electric bus. The radiator assembly comprises a motor and controller cooling radiator, an engine cooling radiator, a supercharging intercooler and a cooling fan, wherein the motor and controller cooling radiator and the engine cooling radiator are connected in the same row; the supercharging intercooler is arranged outside the motor and controller cooling radiator and the engine cooling radiator; the engine cooling radiator is close to a hot end of the supercharging intercooler; the motor and controller cooling radiator is close to a cold end of the supercharging intercooler; and the cooling fan is arranged inside the motor and controller cooling radiator and the engine cooling radiator. Since the circulating water passages of the two radiators are independent of each other, the cooling effects of an engine and a motor and controller cooling system are enhanced, and the work and the life of the radiator assembly are guaranteed; and thus, the problem of arrangement of the radiator assembly in an engine driving cabin of the hybrid electric bus is solved.

The invention discloses a multistage-damping torsion damper for a hybrid electric vehicle, belonging to the technical field of hybrid electric vehicle clutches. The invention aims at providing the multistage-damping torsion damper for the hybrid electric vehicle, wherein the multistage-damping torsion damper is suitable for the hybrid electric vehicle and is capable of realizing multistage buffering of a large torque brought by an engine and effectively reducing the abnormal sound probability generated by the whole transmission system. An idling damper is arranged between a predamping driven disk and a predamping cover plate; a driven disk and a damping disk are respectively provided with a first-stage main damper, a second-stage main damper and a third-stage main damper; and the first-stage main damper is composed of two groups of internally and externally sleeved springs. The distribution radius of the damping springs and the rigidity of the springs are increased, and the torsion limiting angle and limit torque of the torsion damper are effectively increased, so that the torsion damper can meet the special requirements of hybrid electric buses on the torsion damping characteristic, and the torsion damper is a brand-new designed and manufactured multistage-damping large-corner silencing torsion damper.

The invention discloses a battery pack temperature regulation system, which is used for regulating battery pack temperature of a hybrid power electric bus. The battery pack temperature regulation system comprises a pump, a battery pack box and a proportional control three-way valve which are sequentially communicated via a fluid pipeline, wherein the two outlets of the proportional control three-way valve are respectively communicated with a cooler and a heat exchanger via the fluid pipeline, the cooler and the heat exchanger are communicated with the pump via the fluid pipeline to form a circulation loop, and the fluid pipeline is filled with a fluid medium. In the battery pack temperature regulation system, the proportional control three-way valve is used for regulating fluid proportions of the cooler and the heat exchanger, a cooling fan of a motor cooling water tank and an engine cooling water circulation system of the hybrid power electric bus are respectively used for cooling and heating the fluid medium, an extra refrigeration device or a heating device is not added, the temperature of the fluid medium back-flowing to the battery pack box is kept in an appropriate range, the battery can be prevented from overheating, and particularly for a cold region, the normal operation of the battery also can be guaranteed.

The invention relates to a high-voltage power distribution unit of a hybrid electric bus. The high-voltage power distribution unit comprises an ISG (integrated starter generator) motor controller for connecting ISG motor generating output, a driving motor controller for controlling and connecting a driving motor and an energy storing device, wherein the negative ends of the ISG motor controller and the driving motor controller are connected with the negative end of the energy storing device. The high-voltage power distribution unit also comprises a switching circuit for charging and discharging, wherein one end of the switching circuit is in short-circuit connection with the positive ends of the ISG motor controller and the driving motor controller, and the other end of the switching circuit is connected with the positive end of the energy storing device; and the switching circuit is composed of two parallel branches, wherein one parallel branch is composed of one group of contact terminals of a first contactor and a first resistance, and the other parallel branch is composed of one group of contact terminals of a second contactor. According to the invention, the number of electronic elements is reduced and the influence of the damage of electric elements on the high-voltage circuit of the whole bus is also reduced on the premise that the high-voltage power distribution pre-charging requirement of the whole bus is met.

The invention relates to an integrated motor control and charge device for a hybrid electric bus, comprising a main current transformer, a sub current transformer, a main control unit, a charge interface, a power supply control unit, an electric accessory interface and a charge / drive switchover unit, wherein the alternating-current side of the main current transformer is connected with the charge interface via a charge contactor, and connected with a main motor via a drive contactor; the direct-current side of the main current transformer is serially connected with a switch circuit used for being connected with an onboard energy device; the direct-current side of the sub current transformer is correspondingly connected with the electric accessory interface formed on the device and the direct-current side of the main current transformer respectively; the alternating-current side of the sub current transformer is used for being connected with a power generator; the main control unit is in control connection with the main current transformer and the sub current transformer; the charge / drive switchover unit is used for switchover between charge and drive; and the power supply control unit is used for controlling the switch circuit to perform pre-charge and power-on actions on the device. Via the device, the use quantity of high-voltage wiring harnesses is reduced, the heat productivity of the components is reduced, the cost of the whole bus is decreased, and the valid space of the whole bus is increased.

The invention discloses a plug-in hybrid electric bus electromechanical coupling system which comprises an auxiliary power system region, an energy source region, a transmission system region and a control and signal region. On the basis of the characteristic that a series-parallel plug-in hybrid electromechanical coupling system integrates series hybrid power and parallel hybrid power, the plug-in hybrid electric bus electromechanical coupling system disclosed by the invention can ensure both an engine and a driving motor to work in a high efficiency region under any condition, has wider application range and has the advantages of fulfilling the aims of improving the reliability of a finished automobile and reducing the energy consumption by the high integration and integrated control of the system and meeting the requirement on the mass production.

The invention discloses a pneumatic-electric system of a pneumatic-electric hybrid electric bus, including LNG cylinders, a gas control panel, an electric generator , an air-conditioning compressor, acirculating water pump for a driving motor, a heat dissipation fan for high-pressure cabin, a power battery fire extinguisher and a battery charging port, The LNG cylinder is horizontally laid on theleft side of the middle section of the body, a cylinder collision beam is installed between the hatch door of the LNG cylinder and the LNG cylinder, the gas control panel is arranged at the rear endof the LNG cylinder, a battery is arranged at the bottom of one end of the system, and the battery is arranged at the bottom of the rear end of the body. The invention has the advantages that: the twohigh-pressure cabin cooling fans are located on the roof directly above the high-pressure cabin, The utility model is used for heat dissipation of the high-pressure cabin, and the power battery fireextinguisher is used for extinguishing the power battery in case of an accident. The system has the advantages of high selectivity, reasonable layout, simple and compact structure, better utilizationof the frame space, and better overall stability and safety performance of the pneumatic-electric hybrid electric bus.

The invention provides a plug-in hybrid electric bus power supply system, the positive pole of the 24V battery group is connected with a power switch, the power switch is connected with a ON power switch, an ACC power switch and a start power switch respectively, the connection and disconnection of the coil of a first relay is controlled by the start power switch, the connection and disconnection of the coil of a second relay is controlled by the ON power switch; the positive pole of the12V battery group is connected with the end of the first relay with normal open touch points, and the end of the second relay with normal open touch points, and the constant electric end of the12V drive box control device respectively, the other end of the first relay with normal open touch points is connected with the signal starting end of the 12V drive box control device, the other end of the second relay with normal open touch points is connected with the IG ignition power end of the 12V drive box control device, the 24V vehicle control device and the ACC power switch are connected, the 24V vehicle control device and the 12V drive box control device are connected through a first route CAN bus, and the vehicle is controlled in a power-on and power-off mode by the power system through a CAN communications agreement. The system is novel in design, safe and reliable.

The invention discloses a cyclic operation state testing system and method for a hybrid electric bus. According to the cyclic operation state testing system, a user layer carries out selection of operation states to be tracked, connection confirmation of equipment and setting of basic parameters; an execution layer analyzes actual vehicle CAN signals received from a real-time controller according to settings of the user layer, the related parameters, obtained through analysis, of a motor and an engine are used for judgment of the work modes of the hybrid electric bus, and the vehicle speed signals obtained through analysis are used for vehicle speed display; and the real-time vehicle speed analyzed out by the execution layer, the standard operation state vehicle speed to be tracked and the boundary vehicle speed to be tracked are displayed in an oscillogram of a display layer, and meanwhile the equipment connection state, the actual vehicle speed value, the number of times of vehicle speed overrun and the work mode are displayed in real time. Vehicle speed tracking in a standard cyclic operation state test of the hybrid electric bus is realized.

The invention relates to a charging method for hybrid electric bus super capacitors. A super capacitor is charged by a generator carried by a hybrid electric bus. First, the super capacitor is charged at limited power through counter electromotive force generated by the generator; when the voltage of the super capacitor reaches a first set value through charging, an engine is started to drive the generator to charge the super capacitor at low power; when the voltage of the super capacitor reaches a second set value, power is compensated to the super capacitor through trickle charge; and when the super capacitor is compensated to reach a certain range, the speed of the engine is improved to an economic zone, and the generator is driven by the engine to charge the super capacitor at high power. The whole charging process requires no external charger or new equipment. The charging process is simpler. The defects of a scheme in which a super capacitor and a motor are combined are avoided. The problems of factory charging and after-repair power compensation of super capacitors are solved.

The invention provides a management system circuit for a hybrid electric bus, in particular to a management system circuit used for a hybrid power of a hybrid electric bus. The management system circuit comprises a hybrid power control circuit and a hybrid power circuit, wherein the hybrid power control circuit comprises an intelligent power module; the hybrid power circuit comprises a storage battery and an ultra-capacitor which are of a parallel-connection structure; the storage battery is connected with the intelligent power module in series; and the ultra-capacitor is connected with the intelligent power module in series. By using the management system circuit used for the hybrid power of the hybrid electric bus, the flexibility of the storage battery access control and the reliability of the system can be ensured; the seamless access or the seamless switch, the flexibility of power distribution and the diversification of charging and discharging modes can be realized, the system efficiency is further improved and the system life is prolonged.

The invention discloses a power device of a plug-in series-parallel hybrid electric bus. The power device comprises a generator, an engine, an automatic clutch, a driving motor, a motor controller and a whole control box, wherein the whole control box is provided with a lithium battery energy storage system, an electric inflating pump and an electric power-assisted steering pump; the lithium battery energy storage system is provided with an outer charging interface; and the whole control box is respectively connected with the generator and the motor controller. By the way, the power device of the plug-in series-parallel hybrid electric bus can realize purely electric running, effectively reduce the discharge of tail gas and improve the economical efficiency of fuel oil.

The invention discloses a hybrid electric vehicle control strategy, and relates to a novel dynamic switching method for the speed of a hybrid electric bus. The novel dynamic switching method mainly includes the steps: acquiring acceleration information of the bus; acquiring on-off information of an air conditioner of the bus; acquiring speed information of the bus; determining switching speed of the bus according to the three information parameters; and controlling an automatic clutch according to the switching speed of the bus. The novel dynamic switching method for the speed of the hybrid electric bus can be used for not only meeting the requirements of the clutch on connection and separation, but also meeting the requirements of the clutch on connection and separation after idle speed boost of an engine and the air conditioner, so that oil consumption of the bus can be reduced, smoothness of the bus is improved, and the service life of the clutch is prolonged.

The invention discloses a method for predicting the future speed trajectory of a hybrid power bus. The method includes the following steps that parameters are obtained and normalized; an input parameter vector and an output parameter vector of an RBF neural network are determined; the RBF neural network is offline trained; the future speed trajectory is online predicted. Based on online learning of the RBF neural network, prediction of the speed trajectory is studied under the precondition that global optimization of the control strategy of the hybrid power bus is achieved from the aspect of a people-bus-environment system, the method for predicting the bus future driving trajectory is provided and fully takes bus state parameters, driver driving styles and front road environment and traffic state parameters into consideration, and accuracy of prediction of the bus speed is improved. The influences of the people-bus-environment system on the future working condition is fully taken into consideration, accuracy of prediction of the working condition is improved while the bus has the precognition capacity, and a good foundation is laid for global optimization of the control strategy.

The invention discloses a mounting device used for a power mechanism of a hybrid electric bus. The mounting device comprises a motor (5), a motor-end belt wheel (6) connected with the motor (5), an engine (1) connected on the bus, an engine-end belt wheel (2) connected with the engine (1), a transmission belt (3) used for connecting the motor-end belt wheel (6) with the engine-end belt wheel (2), and a swinging and tensioning mechanism (4) connected on the bus, both the motor (5) and motor-end belt wheel (6) are arranged on the swinging and tensioning mechanism (4), and stressing and tensioning of the transmission belt (3) are adjusted through the swinging and tensioning mechanism (4). By the mounting device, stress between the two belt wheels can be more balanced, and wear of the transmission belt can be reduced.

The invention discloses an electric bus hybrid charging station charging timetable design method based on robust optimization, and the method comprises the steps: building a hybrid electric bus charging station frame, and determining problems and parameter variables; declaring basic hypotheses and conditions; establishing a deterministic optimization model; building a robust optimization problem based on a budget uncertainty set by considering the uncertainty of the inbound residual electric quantity; by using affine transformation, converting an observation variable into a current variable, and constructing an affine adjustable robust peer-to-peer model; and forming a solvable robust optimization model based on a strong duality theory and duality conversion, and designing a charging timetable. According to the method, plug-in type charging and battery replacement charging are creatively fused, the uncertainty of the remaining electric quantity of the bus when the bus enters the station is considered, robust optimization is adopted, the electric bus charging timetable design is carried out based on the strong dual theorem, the charging cost is reduced, and constructive suggestions and reliable technical supports are provided for operation optimization of the hybrid charging station.

The invention discloses a regional control method for bus stops of hybrid buses based on intelligent traffic information. The method comprises the steps of: step 1, collecting the speed, the throttleopening, the distance from the next bus station and the battery power information of a bus according to a sampling period; step 2: carrying fuzzification on the speed, the throttle opening, the distance from the next bus station and the battery power information of the bus, and then performing fuzzy inference calculation, defuzzification and obtaining a control permission degree; step 3, when thecontrol permission degree is {low}, allowing the bus to drive according to the original driving state; when the control permission is {medium, high}, disconnecting an engine of the bus from a clutch of a transmission to maintain torqueless transmission between the engine and the transmission and keeping the engine turned off; keeping the transmission running in a low gear position, allow downshifting, prohibiting the upshift; and using a drive motor to drive the bus separately and limiting the output power thereof. Accordingly, the comprehensive energy consumption and the service life of the clutch are improved.

The invention discloses a hybrid electric bus engine starting method. A hybrid electric bus comprises an engine, a clutch mechanism, an electric motor and a transmission; the engine, the clutch mechanism, the electric motor and the transmission are arranged in sequence; the engine and the electric motor are dynamically coupled with each other and mutually provide power needed by bus running; an output shaft of the electric motor is connected with the input end of the transmission; the transmission is connected with a rear axle of the hybrid electric bus; when the hybrid electric bus is started, the hybrid electric bus is driven by the electric motor to run; after a vehicle speed reaches a certain value, the engine is started to drive the hybrid electric bus to run; the engine is started after being towed to an idling speed by the electric motor; and the engine is slowly driven to run to the idling speed while the bus is driven by the electric motor. No influence on the power of the buscan be guaranteed, and an effect of economically starting the engine can also be achieved.

The invention relates to a hybrid power bus tail end structure. The hybrid power bus tail end structure comprises a hybrid power nine-piece beam, an engine compartment framework assembly installed above the hybrid power nine-piece beam, an engine left tail longitudinal beam assembly, an engine right tail longitudinal beam assembly, a heat release module installation support arranged on the left side of the engine left tail longitudinal beam assembly, a plurality of post-treatment system installation supports arranged on the right side of the engine right tail longitudinal beam assembly, a first connection support connecting the engine compartment framework assembly with the heat release module installation support, and a second connection support used for connecting the engine right tail longitudinal beam assembly with part of the post-treatment system installation supports. The engine left tail longitudinal beam assembly and the engine right tail longitudinal beam assembly are arranged on the left side and the right side of the middle segment of the hybrid power nine-piece beam symmetrically. The defects in the prior art can be overcome through the hybrid power bus tail end structure. The hybrid power bus tail end structure is suitable for hybrid power buses of various lengths and high in universality, and has the characteristics of being small in overall weight, high in strength, high in safety and the like.