CN221049495U - Multi-motor coupling electric drive control system for vehicle - Google Patents

Abstract

The application relates to a multi-motor coupling electric drive control system for a vehicle, and relates to the technical field of electromechanical integrated drive control systems. The motor-driven gearbox comprises a gearbox, wherein the output end of the gearbox is connected with a differential mechanism, the input end of the gearbox is provided with four groups of motors which are mutually coupled in parallel, a fixed shaft type electromechanical coupling structure for torque transmission is arranged in the gearbox, and an oil cooling circulation structure is arranged on the gearbox and used for cooling the gearbox and the motors so as to optimize the working conditions of the gearbox and the motors; the motor is electrically connected with the controllers. The application is mainly applied to markets in the subdivision fields of commercial vehicle heavy trucks, mining trucks, engineering machinery and the like, is used as a solution to the problems of lack of a high-power and high-efficiency power system and the like, and particularly has the effects of optimizing the working condition of an engine or a motor, reducing oil consumption and emission and ensuring good power performance due to the special working condition using scene requirements of low-speed heavy-load and high-frequency short-connection transportation.

Description

Multi-motor coupling electric drive control system for vehicle

Technical Field

The application relates to the technical field of electromechanical integrated drive control systems, in particular to a multi-motor coupling electric drive control system for a vehicle.

Background

The main advantages and purposes of the development of the pure electric or hybrid electric vehicle are energy conservation and emission reduction, and the fuel consumption and emission of the whole vehicle are reduced on the premise of ensuring good dynamic performance, so that the method is one of the main development directions of the current automobile industry.

In market of commercial vehicles in the field of heavy truck, mine truck, engineering machinery and the like, a high-power and high-efficiency power system solution is lacking, and particularly, the special working condition of low-speed heavy-load and high-speed short-connection transportation is required, and the application of an electric power system can effectively provide the solution of the power system for the commercial vehicles in the field; although the oil-to-electricity technology is small in difficulty and short in development period, the boundary constraint of the whole vehicle is too much, and standardization and unification cannot be achieved.

At present, a large amount of passenger cars are pushed at 800V, the first is high power, the second is charging speed, namely super charging, and the commercial car is in a 800V route in a short period, so that industrialization is difficult to realize truly because production cost, a supply chain and matched infrastructure such as charging piles are taken into consideration.

From the output of the controller, the output voltage of the existing controller is mostly used for commercial vehicles at present, because the voltage of the commercial vehicles is usually rated at 540V, and the current voltage range of silicon carbide of the commercial vehicles is 400-900V, and 1200V is also achieved, the voltage of the commercial vehicles is required to be increased to be rated at 750V or higher, and a silicon carbide system is adopted to meet the requirements of light weight, high integration and long endurance.

From the perspective of a motor and a gearbox, the commercial heavy truck has the advantages that the commercial heavy truck is under 12000 revolutions in a short period, the commercial heavy truck is similar to a fuel version automobile, the torque of a driving motor can be multiplied by a matching speed reducer, the motor can work in a more efficient rotating speed interval through a multi-gear gearbox, the system can have a wider rotating speed interval and larger torque, but the multi-gear gearbox has some limiting factors such as performance, working conditions, reliability and cost, and the like, as the motor technology is developed, the rotating speed is higher and higher, the vehicle speed inflection point of the continuous maximum output torque is gradually transferred from a low speed to a high speed, namely the most economical cruising vehicle speed and the efficient working interval corresponding to the motor are gradually enlarged. Therefore, under the working condition of low speed and heavy load, a multi-gear transmission is not needed to amplify the high-efficiency interval of the motor.

In summary, from various factors, the voltage class of the whole vehicle system is improved to 800V, and a multi-motor, a silicon carbide controller and a single-gear gearbox are adopted, so that the method is the best solution for high-power vehicle types such as heavy truck and mine truck of commercial vehicles.

Disclosure of utility model

In order to optimize the working condition of an engine or a motor of an electromechanical coupling system, reduce oil consumption and emission and ensure good power performance, the application provides a multi-motor coupling electric drive control system for a vehicle.

The application provides a multi-motor coupling electric drive control system for a vehicle, which adopts the following technical scheme:

The multi-motor coupling electric drive control system for the vehicle comprises a gear box, wherein the output end of the gear box is connected with a differential, the input end of the gear box is provided with four groups of motors, the four groups of motors are mutually coupled in parallel, a fixed shaft type electromechanical coupling structure for torque transmission is arranged in the gear box, an oil cooling circulation structure is arranged on the gear box, and the oil cooling circulation structure is used for cooling the gear box and the motors so as to optimize the working conditions of the gear box and the motors;

The motor is electrically connected with the controllers.

By adopting the technical scheme, the vehicle multi-motor coupling electric drive control system is powered by an external battery pack, the controller inverts and rectifies the input current, the current passing through the stator winding in the motor generates electromagnetic induction, so that the rotor is driven to rotate, the rotor transmits the rotating moment to the gear box, the differential, namely the vehicle drive axle pack, is driven to distribute power through the mechanical transmission of the fixed shaft type electromechanical coupling structure in the gear box so as to drive the vehicle half axle tyre to run, and when the vehicle multi-motor coupling electric drive control system runs, the oil cooling circulation structure can continuously exchange heat and cool the gear box and the motor, so that the working conditions of the gear box and the motor are optimized, and the effects of reducing oil consumption and emission and simultaneously maintaining good power performance are achieved.

Optionally, the fixed shaft type electromechanical coupling structure comprises four input shafts, four input shaft gears, an output shaft and an output shaft big gear, and the motor, the input shaft and the input shaft gears are in one-to-one correspondence; the input shaft is rotationally connected with the gear box, the rotor of the motor is connected with the corresponding input shaft, the input shaft gear is sleeved on the peripheral wall of the corresponding input shaft, the output shaft is rotationally connected with the gear box, the output shaft is connected with the differential mechanism, the output shaft big gear is sleeved on the peripheral wall of the output shaft, the output shaft big gear is positioned among the four input shaft gears, and each input shaft gear is meshed with the output shaft big gear.

Through the technical scheme, the rotor of the motor is connected with the corresponding input shaft, and the input shaft is driven to rotate in the rotating process of the electronic rotor, so that the output shaft is driven through the meshing relationship between the input shaft gear and the output shaft gear, and then the differential is driven to operate.

Optionally, the peripheral wall of the rotor is provided with a front bearing and a rear bearing, and the rotor is rotationally connected to the motor casing through the front bearing and the rear bearing; the input shaft is rotatably connected to the gear box through the front input shaft bearing and the rear input shaft bearing; the output shaft is provided with a front cone bearing and a rear cone bearing on the peripheral wall, and is rotatably connected to the gear box through the front cone bearing and the rear cone bearing.

By adopting the technical scheme, the front bearing and the rear bearing are arranged. The front bearing, the rear bearing, the front cone bearing and the rear cone bearing of the input shaft can effectively reduce abrasion of the rotor, the input shaft and the output shaft during rotation, so that the rotation is smoother, the smoothness in the transmission process is improved, and the service life is prolonged.

Optionally, the oil cooling circulation structure comprises a gear box oil pan, an oil pump oil distributor, four oil pumps and four heat exchangers, wherein the motor, the oil pump and the heat exchangers are in one-to-one correspondence; the oil pump oil distributor is communicated with the oil outlet end of the oil pan of the gear box, the oil pump is arranged on the outer wall of the corresponding motor, the oil pump is communicated with the oil outlet end of the corresponding motor, the oil pump oil distributor is used for distributing oil flowing out of the oil pan of the gear box into the oil pump, the heat exchanger is communicated with one end of the oil pump, which is far away from the oil pump oil distributor, the oil outlet end of the heat exchanger is communicated with the stator winding in the motor shell, and the rotor rotates to drive the oil to flow into an inner hole of an input shaft of the gear box.

Through adopting above-mentioned technical scheme, the inside lubricating oil of gear box flows into the gear box oil pan after carrying out lubrication to gear box inner structure, in the middle of entering oil pump oil separator through the gear box oil pan, in distributing lubricating oil to four oil pumps through oil pump oil separator, remaining lubricating oil in the motor that the oil pump corresponds also will get into the oil pump, lubricating oil again gets into in the heat exchanger by the oil pump, carry out heat transfer cooling to lubricating oil by the heat exchanger, the lubricating oil after the cooling just can continue to carry in the stator winding of corresponding motor, thereby spray the cooling to the stator winding through the lubricating oil after the cooling, simultaneously play the lubrication effect to the bearing on the motor inner rotor, lubricating oil further gets into in the hole of rotor, in rotor pivoted in-process, follow the rotor and enter into the hole of gear box input shaft, thereby enter into in the gear box, cool down and lubricate the part inside the gear box, form a set of complete oil cooling circulation from this, the oil duct realizes initiative lubrication function, the cooling lubrication effect of bearing when the motor is high-speed has been guaranteed, the sealing problem when the motor shaft is no longer needed to consider high-speed rotation to the cooling, and has higher practicality.

Optionally, the oil cooling circulation structure still includes first temperature sensor, first pressure sensor, second temperature sensor and the second pressure sensor that correspond four groups motor settings, first temperature sensor and first pressure sensor all link to each other with corresponding oil pump, first temperature sensor and first pressure sensor are used for detecting the temperature and the oil pressure that flow through the oil pump respectively, second pressure sensor and second temperature sensor set up in the play oil end of corresponding heat exchanger, second pressure sensor and second temperature sensor are used for monitoring the oil pressure and the temperature that flow through heat exchanger.

By adopting the technical scheme, the first temperature sensor, the first pressure sensor, the second temperature sensor and the second pressure sensor are arranged, so that the real-time temperature and oil pressure monitoring can be carried out on lubricating oil flowing in the oil cooling circulation structure, a driver and a whole vehicle controller can be timely reminded when the temperature and the oil pressure are abnormal, and the use safety of the multi-motor coupling electric drive control structure for the vehicle can be improved.

Optionally, be provided with first filter screen between gear box oil pan and the oil pump oil separator, be provided with the second filter screen between the play oil end of motor and the oil pump, be provided with the smart filter screen between oil pump and the heat exchanger.

Through the adoption of the technical scheme, the first filter screen, the second filter screen and the fine filter screen can filter impurities such as scrap iron mixed in lubricating oil so as to improve the overall quality of the lubricating oil, and meanwhile, the problem of blockage caused by excessive scrap iron in parts such as an oil pump, a heat exchanger and the like can be prevented, so that the oil cooling circulation structure is safer, more stable and more efficient in operation.

Optionally, each controller includes two sets of IGBT modules, IGBT module and motor both one-to-one, the IGBT module is connected with corresponding motor winding electricity, each IGBT module all includes 6 MOS transistor switching devices and 1 diode, MOS transistor switching devices and diode parallel arrangement.

Through adopting above-mentioned technical scheme, set up IGBT module and can control opening and close and running power of motor to make the vehicle can adopt different running modes respectively at different travel speeds, make the whole car can run with more high-efficient, energy-conserving mode.

Optionally, the MOS tube switching device is made of SiC.

Through adopting above-mentioned technical scheme, the MOS pipe switching device adopts the SiC material can effectively reduce the switching loss to increase 5-10% range of vehicle, improve energy conversion efficiency, the SiC has the effect that can realize the lightweight simultaneously, and its area is less, can reduce the controller volume about 10-40%, in order to reduce whole car cost.

Optionally, a transition plate is arranged between the motor and the gear box, and the motor is connected with the gear box through the transition plate.

Through adopting above-mentioned technical scheme, set up the cab apron and can install the motor for carry out quick assembly and dismantlement between motor and the gear box, improved the convenience.

Optionally, the motor outer wall is provided with the support frame, the controller forms the assembly with the motor through the support frame.

Through adopting above-mentioned technical scheme, set up the support frame and be convenient for dismantle between controller and the motor, improve the convenience of assembly, also can separate controller and motor simultaneously, guarantee the security of respective structure.

In summary, the present application includes at least one of the following beneficial technical effects:

1. The vehicle multi-motor coupling electric drive control system is powered by an external battery pack, the controller inverts and rectifies the input current, the current passing through the stator winding in the motor generates electromagnetic induction so as to drive the rotor to rotate, the rotor transmits the rotating moment to the gear box, the differential mechanism, namely the vehicle drive axle pack, is driven to distribute power through further transmission of the fixed shaft type electromechanical coupling structure in the gear box so as to drive the vehicle half axle tire to run, and when the vehicle multi-motor coupling electric drive control system is operated, the oil cooling circulation structure can continuously exchange heat and cool the gear box and the motor, so that the working conditions of the gear box and the motor are optimized, and the effects of reducing oil consumption and emission and maintaining good power performance are achieved;

The MOS tube switching device adopts the SiC material, so that the switching loss can be effectively reduced, the endurance mileage of a vehicle is increased by 5-10%, the energy conversion efficiency is improved, meanwhile, the SiC has the effect of realizing light weight, the area is smaller, and the volume of the controller can be reduced by about 10-40%, so that the cost of the whole vehicle is reduced.

Drawings

Fig. 1 is a schematic structural diagram of a multi-motor coupling electric drive control system for a vehicle according to an embodiment of the present application.

Fig. 2 is a cross-sectional view of a motor and gearbox in an embodiment of the application.

Fig. 3 is a schematic diagram of the structure of a controller in an embodiment of the present application.

Fig. 4 is a schematic diagram of an oil cooling cycle structure in an embodiment of the present application.

Fig. 5 is a schematic diagram of switching between different vehicle speed modes according to an embodiment of the present application.

Reference numerals illustrate: 1. an oil pump; 2. a heat exchanger; 3. a controller; 4. a motor; 5. a gear box; 6. a support frame; 7. a motor housing; 8. a rear bearing; 9. a stator winding; 10. a rotor; 11. a front bearing; 12. a transition plate; 13. an oil seal; 14. an input shaft; 15. an input shaft front bearing; 16. an input shaft gear; 17. an input shaft rear bearing; 18. an output shaft gearwheel; 19. a rear cone bearing; 20. a front cone bearing; 21. an output shaft oil seal; 22. an output shaft; 23. a fixed shaft electromechanical coupling structure; 24. an oil cooling circulation structure; 25. a gearbox oil pan; 26. an oil pump separator; 27. a first temperature sensor; 28. a first pressure sensor; 29. a second temperature sensor; 30. a second pressure sensor; 31. a first filter screen; 32. a second filter screen; 33. fine filtering net; 34. an IGBT module; 35. a MOS transistor switching device; 36. a diode.

Description of the embodiments

The application is described in further detail below with reference to fig. 1-5.

The embodiment of the application discloses a multi-motor coupling electric drive control system for a vehicle. Referring to fig. 1 and 2, the motor assembly device comprises a gear box 5, four motors 4 and two controllers 3, wherein a transition plate 12 is arranged on one side of the gear box 5, and the four motors 4 are connected with the gear box 5 through the transition plate 12 so as to quickly assemble and connect the motors 4; four groups of motors 4 are mutually coupled in parallel, a stator winding 9 is arranged in each motor shell 7 and is connected with a rotor 10, the peripheral wall of the rotor 10 is provided with a front bearing 11 and a rear bearing 8, and the rotor 10 is in rotary connection with the motor shells 7 through the front bearing 11 and the rear bearing 8.

Referring to fig. 1 and 2, a fixed shaft type electromechanical coupling structure 23 for torque transmission is arranged in the gear box 5, and the fixed shaft type electromechanical coupling structure 23 comprises four input shafts 14, four input shaft gears 16, an output shaft 22 and an output shaft large gear 18, wherein the motor 4, the input shaft 14 and the input shaft gears 16 are arranged in one-to-one correspondence.

Referring to fig. 1 and 2, the input shaft 14 is provided with an input shaft front bearing 15 and an input shaft rear bearing 17 on the peripheral wall, the input shaft 14 is rotatably connected with the gear case 5 through the input shaft front bearing 15 and the input shaft rear bearing 17, and one end of the rotor 10 extending out of the motor casing 7 is connected with the corresponding input shaft 14 through a spline, so that the input shaft 14 is rotated; the output shaft 22 is arranged on the inner wall of one side of the gear box 5 far away from the motor 4, one end of the output shaft 22 extends out of the gear box 5 and is connected with a drive axle package (differential mechanism), a front cone bearing 20 and a rear cone bearing 19 are arranged on the peripheral wall of the output shaft 22 in the gear box 5, and the output shaft 22 is in rotary connection with the gear box 5 through the front cone bearing 20 and the rear cone bearing 19.

Referring to fig. 1 and 2, the input shaft gears 16 are sleeved on the peripheral walls of the corresponding input shafts 14, the output shaft large gears 18 are sleeved on the peripheral walls of the output shafts 22, the output shaft large gears 18 are positioned among the four input shaft gears 16, and each input shaft gear 16 is meshed with the output shaft large gear 18, so that power transmission can be performed.

Referring to fig. 1 and 2, a supporting frame 6 is arranged on the outer wall of a motor 4, controllers 3 are assembled with the motor 4 through the supporting frame 6, each controller 3 is electrically connected with two motors 4, in a specific use process, the motors 4 are externally connected with battery packs, the battery packs with the rated 600V/282kWh provide continuous 200A current through a direct current bus, the current flowing through stator windings 9 of the motors 4 is rectified through the inversion of 2 controllers 3, electromagnetic induction is generated to drive a rotor 10 to rotate, the rotor 10 is assembled with spline fit tooth sides of an input shaft 14 of a gear box 5 in a centering manner, torque output by the rotor 10 is meshed with a gear of an output shaft large gear 18 through an input shaft gear 16, the torque is transmitted to an output shaft 22, and finally the output shaft 22 is externally connected with a transmission shaft to a drive axle pack to distribute power so as to drive a whole car half-axle tire to run; the fixed shaft electromechanical coupling structure 23 can independently control the running condition of the engine when in electric coupling, and control the engine to work in the most economical area when in torque coupling, and the torque of the engine can be controlled, and the rotating speed can not be independently controlled, so that the engine can work in the economical area by controlling the torque of the motor 4.

Referring to fig. 1 and 3, each group of controllers 3 includes two groups of IGBT modules 34, where the IGBT modules 34 and the motor 4 are arranged in a one-to-one correspondence, and the IGBT modules 34 are electrically connected with the windings of the corresponding motor 4; each group of IGBT modules 34 comprises 6 SiC silicon carbide MOS tube switching devices 35 and 1 diode 36,6 SiC silicon carbide MOS tube switching devices 35 and diodes 36 which are arranged in parallel, and the MOS tube switching devices 35 are made of SiC, so that switching loss can be reduced, and the endurance mileage can be increased by 5-10%; thanks to the superior performance of SiC, the volume of the controller 3 can be reduced by about 10% -40%; the cost of the whole vehicle is reduced.

Further, by adopting the controller 3 of the present application, the total 24 SiC silicon carbide MOS transistor switching devices 35 of the present application are sequentially named as Q1-Q24,4 diodes 36 are respectively named as T1-T4, and corresponding stator windings 9 of four motors 4 are also respectively named as 1# -4# motor 4 windings:

Referring to FIGS. 3 and 5, when the vehicle is running at a high speed (vehicle speed n. Gtoreq.45 km/h), T1& T3 is turned on, T2& T4 is turned off, windings 1# and 3# motor 4 participate in operation (partial windings), and windings 2# and 4# motor 4 stop operation. The mode reduces the working number of the participating motors 4, namely reduces the counter electromotive force of the windings and reduces the field weakening depth, so that the system keeps constant power and operates with high efficiency;

When the vehicle runs at a low speed (the vehicle speed n is less than 25 km/h), the T1 and the T3 are turned off, the T2 and the T4 are turned on, and the windings of the motor 4# 1 to the motor 4 work simultaneously (full windings). The mode increases the working number of the participating motors 4, namely increases the number of winding turns, and improves the torque output capacity of the motors 4 of the whole system;

When the vehicle speed is 25-45 km/h, T2 and T4 are closed, and the parasitic body diodes 36 of the 12 MOS transistors of Q7-Q12 and Q19-Q24 follow current to charge the capacitor and the battery pack, so that energy recovery is realized.

Referring to fig. 2 and 4, an oil cooling circulation structure 24 is provided on the gear box 5 for cooling the gear box 5 and the motor 4, and optimizing the working conditions of the gear box 5 and the motor 4, wherein the oil cooling circulation structure 24 comprises a gear box oil pan 25, an oil pump separator 26, four oil pumps 1 and four heat exchangers 2, and the motor 4, the oil pump 1 and the heat exchangers 2 are arranged in a one-to-one correspondence.

Referring to fig. 4, a gear box oil pan 25 is communicated with an oil outlet end of a gear box 5, an oil pump 1 is arranged on the outer wall of a corresponding motor 4, the oil pump 1 is communicated with the oil outlet end of the corresponding motor 4, and a first filter screen 31 is arranged between the gear box oil pan 25 and an oil pump oil separator 26 and is used for filtering impurities such as scrap iron; the oil pump separator 26 is used for distributing oil flowing out from the oil sump 25 of the gear box into the oil pump 1, meanwhile, the oil outlet end of each motor 4 is also communicated with the corresponding oil pump 1, a second filter screen 32 is arranged between the oil outlet end of the motor 4 and the oil pump 1, and the residual lubricating oil in the motor housing 7 can also enter the corresponding oil pump 1.

Referring to fig. 4, the heat exchanger 2 is connected to an end of the oil pump 1 far away from the oil pump separator 26, a fine filter screen 33 is disposed between the oil pump 1 and the heat exchanger 2, so as to further filter impurities such as scrap iron, so as to prevent blockage in the heat exchanger 2, an oil outlet end of the heat exchanger 2 is connected to the stator winding 9 in the motor casing 7, and the rotor 10 rotates to drive oil to flow into an inner hole of the input shaft 14 of the gearbox 5.

Referring to fig. 4, the oil cooling circulation structure 24 further includes a first temperature sensor 27, a first pressure sensor 28, a second temperature sensor 29 and a second pressure sensor 30 provided corresponding to the four sets of motors 4, the first temperature sensor 27 and the first pressure sensor 28 are connected to the respective oil pumps 1, the first temperature sensor 27 and the first pressure sensor 28 are respectively used for detecting the temperature and the oil pressure flowing through the oil pumps 1, the second pressure sensor 30 and the second temperature sensor 29 are provided at the oil outlet ends of the respective heat exchangers 2, and the second pressure sensor 30 and the second temperature sensor 29 are used for monitoring the oil pressure and the temperature flowing through the heat exchangers 2.

In the specific implementation process, the motor 4 is cooled by spraying, the bearing actively lubricates, an oil seal 13 is arranged at the input shaft 14, an output shaft oil seal 21 is arranged at the output shaft 22, an integrated oil duct design is adopted, the rotor 10 shaft of the motor 4 and the input shaft 14 of the gear box 5 can be made into a whole, a branch oil duct is designed in a bearing chamber to realize the active lubrication function, the cooling and lubrication effects of the bearing when the motor 4 rotates at a high speed are ensured, and in addition, the sealing problem when the motor 4 rotates at a high speed is not needed to be considered in the integrated cooling; the pressure and the temperature of the system are monitored at different positions, the cooling medium is oil special for the gearbox, different flow demands are arranged at different cooling points, and on the other hand, the safety overflow valve is arranged on the oil pump 1 for preventing the internal pressure of the cooling and lubricating system from being overlarge.

Furthermore, the application adopts a four-motor parallel architecture and a multi-mode switching control strategy, and can flexibly switch under the following five working condition working modes so as to improve the working efficiency of the system and save the energy consumption.

(1) EV mode: under the low-speed working condition (10-25 km/h), the internal combustion engine has lower power efficiency, the engine does not work in the mode, and under the condition of single-axle driving (such as 4 multiplied by 2 vehicle type), 4 motors (full windings) or 2 motors (partial windings) drive the vehicle to run; when the vehicle starts under a low speed of 25km/h or under a specific working condition or a heavy load goes up a slope, 4 motors are controlled to output power at the same time; when the high speed is above 45km/h, only 2 motors are controlled to output power; and when the speed is 25-45 km/h, entering a gear shifting interval, and outputting power by a 2 motor or a 4 motor.

(2) Series mode (Cheng Chexing increase): when the battery electric quantity is insufficient under the low-speed working condition, the hybrid system is converted into a serial architecture, the engine (diesel oil or methanol) drives the generator to provide power for the driving motor, and at the moment, the hybrid system controls the energy flow by the 2 groups of double-motor controllers so as to ensure that the engine is kept in a high-efficiency working interval and supplies power for the battery and the driving motor.

(3) Engine direct drive mode (hybrid vehicle type-oil electric or methanol & electric): the engine in the medium-high speed working condition has higher working efficiency, and the series mode generates kinetic energy waste due to the need of driving the motor and the addition of some transmission mechanical devices, so that the fuel consumption can be reduced by 10% -15% compared with the series mode by adopting the direct driving mode of the engine.

(4) Parallel mode (mixing or adding Cheng Chexing): under the driving of double axles (such as 6X 4 vehicle type), the heavy load is up-hill (16% -30%) or under the condition of rapid acceleration, the diesel or methanol engine is kept in a high-efficiency working area to directly drive one axle wheel, and the other axle is provided with auxiliary power by the 4-motor driving system.

(5) Energy recovery mode: when the speed is reduced, braking or the vehicle is in a heavy-load downhill slope or the vehicle speed is in a gear shifting interval of 25-45 km/h, the system can convert part of kinetic energy into electric energy, 2 motors are used as generators to recover energy and charge batteries (only a single-axle driving 4 multiplied by 2 vehicle type), and energy waste caused by friction is reduced. Under the driving of double bridges (such as 6 multiplied by 4 vehicle types), 4 motors on one bridge are used for driving, and 4 motors on the other bridge are used as generators for energy recovery, and charging is carried out to supplement the battery packs.

The modes (1) and (5) are applicable to pure electric vehicles; modes (1) - (5) are suitable for mixing or adding Cheng Chexing, and are specifically defined by development of a whole vehicle factory, namely a 4X 2 single-axle driving vehicle type or a 6X 4 double-axle driving vehicle type.

The implementation principle of the multi-motor coupling electric drive control system for the vehicle provided by the embodiment of the application is as follows: the vehicle multi-motor coupling electric drive control system is powered by an external battery pack, the controller 3 inverts and rectifies the input current, the current passing through the stator winding 9 in the motor 4 generates electromagnetic induction, so that the rotor 10 is driven to rotate, the rotor 10 transmits the rotating moment to the gear box 5, the differential, namely the vehicle drive axle pack, is driven to distribute power through further transmission of the fixed shaft type electromechanical coupling structure 23 in the gear box 5 so as to drive the vehicle half axle tyre to run, and when the vehicle multi-motor coupling electric drive control system is operated, the oil cooling circulation structure 24 can continuously perform heat exchange cooling on the gear box 5 and the motor 4, so that the working conditions of the gear box 5 and the motor 4 are optimized, and the effects of reducing oil consumption and emission and maintaining good power performance are achieved.

The above embodiments are not intended to limit the scope of the present application, so: all equivalent changes in structure, shape and principle of the application should be covered in the scope of protection of the application.

Claims (10)

1. A multi-motor coupling electric drive control system for a vehicle is characterized in that: the motor driving device comprises a gear box (5), wherein the output end of the gear box (5) is connected with a differential mechanism, the input end of the gear box (5) is provided with four groups of motors (4), the four groups of motors (4) are mutually coupled in parallel, a fixed shaft type electromechanical coupling structure (23) for torque transmission is arranged in the gear box (5), an oil cooling circulation structure (24) is arranged on the gear box (5), and the oil cooling circulation structure (24) is used for cooling the gear box (5) and the motors (4) so as to optimize the working conditions of the gear box (5) and the motors (4); the motor also comprises two groups of controllers (3), and the motor (4) is electrically connected with the controllers (3).

2. The multi-motor coupling electric drive control system for a vehicle of claim 1, wherein: the fixed shaft type electromechanical coupling structure (23) comprises four input shafts (14), four input shaft gears (16), an output shaft (22) and an output shaft large gear (18), and the motor (4), the input shafts (14) and the input shaft gears (16) are in one-to-one correspondence; the input shaft (14) is rotationally connected with the gear box (5), a rotor (10) of the motor (4) is connected with the corresponding input shaft (14), an input shaft gear (16) is sleeved on the peripheral wall of the corresponding input shaft (14), an output shaft (22) is rotationally connected with the gear box (5), the output shaft (22) is connected with the differential mechanism, an output shaft big gear (18) is sleeved on the peripheral wall of the output shaft (22), the output shaft big gear (18) is positioned among the four input shaft gears (16), and each input shaft gear (16) is meshed with the output shaft big gear (18).

3. The multi-motor coupling electric drive control system for a vehicle of claim 2, wherein: the peripheral wall of the rotor (10) is provided with a front bearing (11) and a rear bearing (8), and the rotor (10) is rotationally connected to the motor casing (7) through the front bearing (11) and the rear bearing (8); the peripheral wall of the input shaft (14) is provided with an input shaft front bearing (15) and an input shaft rear bearing (17), and the input shaft (14) is rotatably connected to the gear box (5) through the input shaft front bearing (15) and the input shaft rear bearing (17); the peripheral wall of the output shaft (22) is provided with a front cone bearing (20) and a rear cone bearing (19), and the output shaft (22) is rotatably connected to the gear box (5) through the front cone bearing (20) and the rear cone bearing (19).

4. The multi-motor coupling electric drive control system for a vehicle of claim 2, wherein: the oil cooling circulation structure (24) comprises a gear box oil pan (25), an oil pump oil separator (26), four oil pumps (1) and four heat exchangers (2), wherein the motor (4), the oil pumps (1) and the heat exchangers (2) are in one-to-one correspondence; the oil pump oil separator (26) is communicated with the oil outlet end of the gear box oil pan (25), the oil pump (1) is arranged on the outer wall of the corresponding motor (4), the oil pump (1) is communicated with the oil outlet end of the corresponding motor (4), the oil pump oil separator (26) is used for distributing oil flowing out of the gear box oil pan (25) into the oil pump (1), the heat exchanger (2) is communicated with the oil pump (1) at one end far away from the oil pump oil separator (26), the oil outlet end of the heat exchanger (2) is communicated with the stator winding (9) in the motor casing (7), and the rotor (10) rotates to drive the oil to flow into an inner hole of the input shaft (14) of the gear box (5).

5. The vehicle multi-motor coupling electric drive control system of claim 4, wherein: the oil cooling circulation structure (24) further comprises a first temperature sensor (27), a first pressure sensor (28), a second temperature sensor (29) and a second pressure sensor (30) which are arranged corresponding to the four groups of motors (4), the first temperature sensor (27) and the first pressure sensor (28) are connected with the corresponding oil pump (1), the first temperature sensor (27) and the first pressure sensor (28) are respectively used for detecting the temperature and the oil pressure flowing through the oil pump (1), the second pressure sensor (30) and the second temperature sensor (29) are arranged at the oil outlet ends of the corresponding heat exchangers (2), and the second pressure sensor (30) and the second temperature sensor (29) are used for monitoring the oil pressure and the temperature flowing through the heat exchangers (2).

6. The vehicle multi-motor coupling electric drive control system of claim 4, wherein: a first filter screen (31) is arranged between the gear box oil pan (25) and the oil pump oil separator (26), a second filter screen (32) is arranged between the oil outlet end of the motor (4) and the oil pump (1), and a fine filter screen (33) is arranged between the oil pump (1) and the heat exchanger (2).

7. The multi-motor coupling electric drive control system for a vehicle of claim 1, wherein: each controller (3) all includes two sets of IGBT modules (34), IGBT module (34) and motor (4) both one-to-one, IGBT module (34) are connected with corresponding motor (4) winding electricity, and each IGBT module (34) all includes 6 MOS pipe switching device (35) and 1 diode (36), MOS pipe switching device (35) and diode (36) parallelly connected setting.

8. The vehicle multi-motor coupling electric drive control system of claim 7, wherein: the MOS tube switching device (35) is made of SiC.

9. The multi-motor coupling electric drive control system for a vehicle of claim 1, wherein: a transition plate (12) is arranged between the motor (4) and the gear box (5), and the motor (4) is connected with the gear box (5) through the transition plate (12).

10. The multi-motor coupling electric drive control system for a vehicle of claim 1, wherein: the outer wall of the motor (4) is provided with a supporting frame (6), and the controller (3) is assembled with the motor (4) through the supporting frame (6).