Multi-mode hybrid power drive transmission control system and method

Abstract

The invention discloses a multi-mode hybrid power drive transmission control system and method. The system comprises an engine, a power generation motor, a transmission device, a speed reducing mechanism, a drive motor and a rear axle. The engine is in transmission connection with the power input shaft, and the power generation motor and the transmission device are arranged on the power input shaft; a power output shaft is in transmission connection with the transmission device, the driving motor, the speed reducing mechanism and the rear axle are arranged on the power output shaft, and the power output shaft is selectively linked with a connecting shaft of the transmission device, the driving motor and / or an intermediate shaft of the speed reducing mechanism; the engine drives the transmission device so that the power generation motor can be charged, and meanwhile the transmission device transmits power to the rear axle through the power output shaft to achieve wheel driving. And the driving motor drives wheels by driving the speed reducing mechanism and the rear axle. The power distribution efficiency of the hybrid vehicle can be improved, and the energy-saving and consumption-reducing performance of the vehicle can be improved.

Description

Technical Field

[0001] The present invention relates to the technical field of hybrid drive control, and more specifically, to a multi-mode hybrid drive transmission control system and method. Background Art

[0002] The existing traditional fuel vehicles have a single driving mode, and the optimization of the power system is difficult to cope with strict regulations. Pure electric vehicles are limited by issues such as driving range, battery, and cost and cannot completely replace traditional power vehicles. Hybrid vehicles use batteries and fuel as energy sources, and engines and electric motors to provide driving force. They have the advantages of long driving range of traditional fuel vehicles and high operating efficiency and low emissions of pure electric vehicles. The fuel consumption and emission levels of hybrid vehicles have been greatly improved, which is of great significance to environmental protection and energy conservation. Especially for commercial vehicles, the working conditions are complex, the application scenarios are diverse, and the utilization rate is high, which makes a huge contribution to fuel consumption and carbon emissions. However, existing hybrid vehicles may enter the power cycle under high working conditions, cannot be driven efficiently, and have poor economy. Therefore, how to combine the motor, electronic control, engine and transmission system architecture to maximize the energy saving and consumption reduction goals of the whole vehicle under different road conditions through control is of great significance. Summary of the invention

[0003] The present invention provides a multi-mode hybrid power drive transmission control system and method, which solves the problem of poor high-speed economy of existing hybrid vehicles, can improve the power distribution efficiency of hybrid vehicles, shorten the switching time, and improve the energy-saving and consumption-reducing performance of the vehicle.

[0004] To achieve the above objectives, the present invention provides the following technical solutions:

[0005] A multi-mode hybrid power drive transmission control system, comprising: an engine, a generator motor, a transmission device, a reduction mechanism, a drive motor and a rear axle;

[0006] The engine is drivingly connected to the power input shaft, and the generator motor and the transmission device are arranged on the power input shaft;

[0007] The power output shaft is in driving connection with the transmission device, the drive motor, the reduction mechanism and the rear axle are arranged on the power output shaft, and can be selectively linked with the connecting shaft of the transmission device, the drive motor and / or the intermediate shaft of the reduction mechanism;

[0008] The engine drives the transmission device to charge the generator motor, and the transmission device transmits power to the rear axle through the power output shaft to drive the wheels;

[0009] The driving motor drives the wheels by driving the reduction mechanism and the rear axle.

[0010] Preferably, the transmission device is a planetary gear and a disconnect mechanism, and the planetary gear and the disconnect mechanism are arranged between the engine and the drive motor, so that when the engine speed increases, the generator motor is driven to charge and at the same time power is provided to the wheels.

[0011] Preferably, the planetary gear and disconnection mechanism include: a planet carrier, a planetary wheel, a ring gear, a sun wheel, a sun wheel brake, a ring gear brake and a planet carrier clutch;

[0012] The planet carrier is fixed to the power input shaft and connected to the engine flywheel, and the planetary gear transmits the output power of the engine through the planet carrier;

[0013] The ring gear is arranged on the power output shaft, and the sun gear is connected to the generator motor shaft via a spline;

[0014] The sun gear brake and the ring gear brake are provided to lock or disconnect the sun gear and the ring gear respectively;

[0015] A planetary carrier clutch is provided to control the engagement or disengagement of the ring gear and the planetary carrier.

[0016] Preferably, the reduction mechanism is connected to the drive motor via a drive motor shaft, and the drive motor shaft is provided with the gear, which is assembled and connected to the rotor of the drive motor.

[0017] Preferably, it also includes: an engine controller, a dual motor controller and a vehicle controller;

[0018] The engine controller is connected to the engine signal and is used to control the operation of the engine;

[0019] The dual-motor controller is respectively connected to the generator motor and the drive motor for signal control of the operation of the generator motor and the drive motor;

[0020] The vehicle controller is respectively connected to the engine controller, the dual-motor controller, the transmission device and the deceleration mechanism signals to coordinate the engine controller and the dual-motor controller according to the vehicle road conditions, throttle, and battery electrical status, and directly controls the engagement and disconnection of the planetary gears and the disconnection mechanism to achieve power drive in each driving mode.

[0021] The present invention also provides a multi-mode hybrid power drive transmission control method, using the above drive transmission control system, and further comprising:

[0022] The drive transmission control system is set to have a pure electric drive mode, an engine drive mode, a hybrid mode, a power generation mode and an energy recovery mode;

[0023] A drive mode matrix table is set, and the vehicle controller coordinates and controls the engine controller and the dual motor controller according to the set control strategy, and controls the engagement or disconnection of the planetary gear and the disconnection mechanism and the first electromagnetic shift sleeve according to the drive mode matrix table and the drive mode to achieve power drive in each drive mode.

[0024] Preferably, it also includes:

[0025] The pure electric driving mode is set to a pure electric driving first gear mode power flow and a pure electric driving second gear mode power flow, so as to perform hierarchical control on the power flow;

[0026] In the pure electric drive mode, the engine does not work and the drive motor works, and the planetary gear and the disconnection mechanism are controlled to engage and disengage to drive the reduction mechanism and the rear axle to reduce speed and increase torque, thereby realizing wheel drive;

[0027] In the engine drive mode, power transmission is achieved through the engine drive planetary gears and the disconnect mechanism and the generator motor, and layered control is performed with power split PS engine drive mode power flow, P13 engine drive mode power flow, P13 engine drive direct gear power flow or P13 engine drive overdrive gear power flow.

[0028] Preferably, it also includes:

[0029] Set the hybrid mode to power split mode and fixed speed ratio output mode;

[0030] The power split mode drives the engine with the power split PS engine drive mode power flow, and controls the drive motor with the pure electric drive first gear mode power flow and the pure electric drive second gear mode power flow;

[0031] The fixed speed ratio output mode drives the engine with a P13 engine driven direct gear power flow or a P13 engine driven overdrive gear power flow, and controls the drive motor with a pure electric drive first gear mode power flow or a pure electric drive second gear mode power flow.

[0032] Preferably, it also includes:

[0033] Set the power generation mode to engine direct power generation mode, power split PS power generation mode and P13 direct gear power generation mode;

[0034] In the engine direct power generation mode, the engine drives the generator motor to charge the battery through the planetary gear and the disconnect mechanism, and converts all the engine power into battery power;

[0035] In the power split PS power generation mode or the P13 direct gear power generation mode, the engine drives the generator motor to charge the battery through the planetary gear and the disconnect mechanism, and converts all or part of the engine power into battery power.

[0036] Preferably, it also includes:

[0037] In energy recovery mode, the engine and generator motor do not work, the vehicle brakes and slows down, the wheels reverse-drive the rear axle and the reduction mechanism, the rear axle drives the output shaft to rotate, and the drive motor shaft is driven to rotate in the first or second gear power path, thereby driving the drive motor to achieve energy recovery.

[0038] The present invention provides a multi-mode hybrid power drive transmission control system and method, which realizes multi-mode power distribution and transmission through the combination of an engine, a generator motor, a transmission device, a reduction mechanism, a drive motor and a rear axle; solves the problem of poor high-speed economy of existing hybrid vehicles, can improve the power distribution efficiency of hybrid vehicles, shorten the switching time, and improve the energy-saving and consumption-reducing performance of the vehicle. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] In order to more clearly illustrate the specific embodiments of the present invention, the drawings required for use in the embodiments are briefly introduced below.

[0040] Figure 1 It is a schematic diagram of a multi-mode hybrid power drive transmission control system provided by the present invention.

[0041] Figure 2 It is a signal connection schematic diagram of a multi-mode hybrid power drive transmission control system provided by the present invention.

[0042] Figure 3 It is a schematic diagram of a multi-mode hybrid power drive transmission control method provided by the present invention. DETAILED DESCRIPTION

[0043] In order to enable persons skilled in the art to better understand the solutions of the embodiments of the present invention, the embodiments of the present invention are further described in detail below in conjunction with the accompanying drawings and implementation modes.

[0044] In view of the problem that current hybrid vehicles have poor high-speed economic performance and are prone to power interruption, the present invention provides a multi-mode hybrid power drive transmission control system and method to solve the problem that existing hybrid vehicles have poor high-speed economic performance, improve the power distribution efficiency of hybrid vehicles, shorten the switching time, and improve the energy-saving and consumption-reducing performance of the vehicle.

[0045] like Figure 1 and Figure 2As shown, a multi-mode hybrid drive transmission control system includes: an engine 1, a generator motor 3, a transmission device, a reduction mechanism, a drive motor 4 and a rear axle 5. The engine 1 is connected to the power input shaft 6 in a transmission manner, and the generator motor 3 and the transmission device are arranged on the power input shaft 6. The power output shaft 8 is connected to the transmission device in a transmission manner, and the drive motor 4, the reduction mechanism and the rear axle 5 are arranged on the power output shaft 8, and can be selectively linked with the connecting shaft of the transmission device, the drive motor and / or the intermediate shaft of the reduction mechanism. The engine 1 drives the transmission device to charge the generator motor 3, and at the same time, the transmission device transmits power to the rear axle through the power output shaft to realize wheel drive. The drive motor 4 realizes wheel drive by driving the reduction mechanism and the rear axle 5.

[0046] Furthermore, the transmission device is a planetary gear and a disconnect mechanism, and the planetary gear and the disconnect mechanism are arranged between the engine and the drive motor, so that when the engine speed increases, the generator motor is driven to charge and at the same time power is provided to the wheels.

[0047] In practical applications, such as Figure 1 As shown, the system consists of the following modules: engine 1, generator motor 3, transmission device, reduction mechanism, drive motor 4 and rear axle 5. The transmission device includes: planetary gear and disconnection mechanism, and the reduction mechanism is a parallel shaft reduction mechanism. The motor module, planetary gear and disconnection mechanism module and parallel shaft reduction module are combined to realize multi-mode power distribution and transmission, and the energy saving and consumption reduction goals of the whole vehicle under different road conditions are met to the maximum extent through control. By controlling the matching of different driving modes, continuous power replenishment is realized during the mode switching process, and there is no power interruption during the process.

[0048] Further, the planetary gear and disconnection mechanism includes: a planet carrier 12, a planetary gear 13, a ring gear 11, a sun gear 14, a sun gear brake 24, a ring gear brake 25 and a planet carrier clutch 27. The planet carrier 12 is fixed to the power input shaft 6 and connected to the engine flywheel, and the planetary gear 13 transmits the output power of the engine through the planet carrier. The ring gear 11 is arranged on the power output shaft 8, and the sun gear 14 is connected to the generator motor shaft 7 through a spline. The sun gear brake 24 and the ring gear brake 25 are provided to lock or disconnect the sun gear 14 and the ring gear 11 respectively. The planet carrier clutch 27 is provided to control the engagement or disconnection of the ring gear with the planet carrier.

[0049] In actual application, the planetary gear and the planet carrier 12 in the disconnection mechanism are fixed to the power input shaft 6 and connected to the engine flywheel 2. The planetary gear 13 is directly driven by the engine 1 through this structure to output power. The ring gear 11 is not fixed and is splined to the power output shaft 8. The sun gear 14 is splined to the generator motor shaft 7. A sun gear brake 24 and a ring gear brake 25 are provided, which can lock or disconnect the sun gear 14 and the ring gear 11 respectively through control. The ring gear clutch 26 and the planet carrier clutch 27 can respectively control the ring gear 11 and the planet carrier 12 to engage and disconnect through control.

[0050] Furthermore, the speed reduction mechanism is connected to the drive motor 4 via the drive motor shaft 10 , and the drive motor shaft 10 is provided with the gear 15 , which is assembled and connected with the rotor of the drive motor 4 .

[0051] Specifically, the drive motor shaft 10 of the parallel axis reduction mechanism is connected to the drive motor 4 . The drive motor shaft 10 is designed to be shared by the input shaft and the motor rotor shaft, that is, a gear 15 is arranged on the drive motor shaft 10 , and the drive motor shaft 10 is assembled with the drive motor 4 rotor.

[0052] The system also includes: an engine controller ECU, a dual motor controller PCU and a vehicle controller VCU. The engine controller is connected to the engine signal for controlling the operation of the engine. The dual motor controller is respectively connected to the generator motor and the drive motor signal for controlling the operation of the generator motor and the drive motor. The vehicle controller is respectively connected to the engine controller, the dual motor controller, the transmission device and the deceleration mechanism signal to coordinate the engine controller and the dual motor controller according to the vehicle road conditions, throttle, and battery electrical status, and directly control the planetary gear and the disconnection mechanism to engage and disconnect, so as to achieve power drive in each driving mode.

[0053] In actual application, the control module is composed of the engine controller ECU, the dual motor controller PCU of the generator motor and the drive motor, and the vehicle controller VCU. The vehicle controller VCU coordinates the engine controller ECU and the dual motor controller PCU according to the vehicle road conditions, throttle, battery electrical status and other systems, and directly controls the engagement and disconnection of the sun gear brake 24, the ring gear brake 25, the planetary carrier clutch 27, the ring gear clutch 26, and the first electromagnetic shift gear sleeve of the disconnection mechanism. The vehicle controller VCU coordinates and controls the engine controller ECU, the dual motor controller PCU, the planetary gear and the sun gear brake 24, the ring gear brake 25, the planetary carrier clutch 27, the ring gear clutch 26, the first electromagnetic shift gear sleeve 21 of the disconnection mechanism according to the control strategy requirements such as power, economy and comfort to realize multi-mode control such as pure electric drive mode, engine drive mode, hybrid drive mode, power generation mode, energy recovery mode, etc.

[0054] The shift control method includes:

[0055] 1) Gear shift control of the deceleration mechanism: After the VCU issues a gear shift command, the VCU determines the gear shift speed difference, and the PCU controls the drive motor 4 to adjust the speed until the intermediate shaft 9 speed is the same as the first electromagnetic shift gear sleeve 21, and the speed difference with the first gear engagement tooth 23 or the second gear engagement tooth 22 is less than 50 (rpm), and then the VCU issues a command to control the drive first electromagnetic shift gear sleeve 21 to shift to the first gear or the second gear; after confirming that the gear shift is successful, the VCU sends a command to the PCU to start the drive motor 4 to realize the drive. During the engagement or separation process, the drive motor 4 is in the "zero torque control mode";

[0056] 2) Brake control: The VCU issues a braking command, the VCU determines the locking speed difference, and the PCU controls the generator motor 3 to adjust the speed to the sun gear 14 or the ring gear (11) speed less than 50 (rpm) as required, and then the VCU issues a command to control the sun gear brake 24 and the ring gear brake 25 to engage. During the engagement or disengagement process, the generator motor 3 is in the "zero torque control mode".

[0057] 3) Clutch control: VCU issues a braking command, VCU determines the engagement speed difference, PCU controls the generator motor 3 to adjust the speed to the ring gear 11 speed until the speed difference with the output shaft 8 is less than 50 (rpm), and then VCU issues a command to control the ring gear clutch 26 to engage; similarly, VCU determines the engagement speed difference, ECU controls the engine 1 to adjust the speed to the planetary carrier 12 speed until the speed difference with the output shaft 8 is less than 50 (rpm), and then VCU issues a command to control the planetary carrier clutch 27 to engage; during the engagement or disengagement process, the generator motor 3 is in the "zero torque control mode".

[0058] It can be seen that the present invention provides a multi-mode hybrid drive transmission control system, which realizes multi-mode power distribution and transmission through the combination of an engine, a generator motor, a transmission device, a reduction mechanism, a drive motor and a rear axle; solves the problem of poor high-speed economy of existing hybrid vehicles, can improve the power distribution efficiency of hybrid vehicles, shorten the switching time, and improve the vehicle's energy-saving and consumption-reduction performance.

[0059] like Figure 3 As shown, the present invention also provides a multi-mode hybrid power drive transmission control method, using the above drive transmission control system, and further comprising:

[0060] S1: Setting the pure electric drive mode, engine drive mode, hybrid mode, power generation mode and energy recovery mode for the drive transmission control system;

[0061] S2: Setting a drive mode matrix table, the vehicle controller coordinates and controls the engine controller and the dual motor controller according to the set control strategy, and controls the engagement or disconnection of the planetary gear and the disconnection mechanism and the first electromagnetic shift sleeve according to the drive mode matrix table and the drive mode, so as to realize the power drive of each drive mode.

[0062] In actual applications, VCU coordinates and controls ECU, PCU, planetary gear and disconnection mechanism, first electromagnetic shift gear sleeve 21 engagement and disconnection according to control strategy requirements such as power, economy and comfort to realize more than ten power transmission modes such as pure electric drive, engine direct drive mode, hybrid drive, energy recovery, power generation, etc. The drive mode matrix is ​​shown in Table 1:

[0063] In Table 1, 22 is the second gear engagement tooth, 23 is the first gear engagement tooth, 24 is the sun gear brake, 25 is the ring gear brake, 26 is the ring gear clutch, and 27 is the planetary carrier clutch.

[0064] The method further includes:

[0065] The pure electric driving mode is set to a pure electric driving first gear mode power flow and a pure electric driving second gear mode power flow, so as to perform hierarchical control on the power flow;

[0066] In the pure electric drive mode, the engine does not work and the drive motor works, and the planetary gear and the disconnection mechanism are controlled to engage and disengage to drive the reduction mechanism and the rear axle to reduce speed and increase torque, thereby realizing wheel drive;

[0067] In the engine drive mode, power transmission is achieved through the engine drive planetary gears and the disconnect mechanism and the generator motor, and layered control is performed with power split PS engine drive mode power flow, P13 engine drive mode power flow, P13 engine drive direct gear power flow or P13 engine drive overdrive gear power flow.

[0068] The method further includes:

[0069] Set the hybrid mode to power split mode and fixed speed ratio output mode;

[0070] The power split mode drives the engine with the power split PS engine drive mode power flow, and controls the drive motor with the pure electric drive first gear mode power flow and the pure electric drive second gear mode power flow;

[0071] The fixed speed ratio output mode drives the engine with a P13 engine driven direct gear power flow or a P13 engine driven overdrive gear power flow, and controls the drive motor with a pure electric drive first gear mode power flow or a pure electric drive second gear mode power flow.

[0072] The method further includes:

[0073] Set the power generation mode to engine direct power generation mode, power split PS power generation mode and P13 direct gear power generation mode;

[0074] In the engine direct power generation mode, the engine drives the generator motor to charge the battery through the planetary gear and the disconnect mechanism, and converts all the engine power into battery power;

[0075] In the power split PS power generation mode or the P13 direct gear power generation mode, the engine drives the generator motor to charge the battery through the planetary gear and the disconnect mechanism, and converts all or part of the engine power into battery power.

[0076] The method also includes: in the energy recovery mode, the engine and the generator motor are not working, the vehicle is braked and decelerated, the wheels reverse drive the rear axle and the deceleration mechanism, the rear axle drives the output shaft to rotate, and the drive motor shaft is driven to rotate in the first gear or second gear power path, thereby driving the drive motor to achieve energy recovery.

[0077] Specifically, each module function uses the VCU control module to realize different working modes to achieve the goal of efficient driving. Through different power flow combinations, the following basic functional modes are realized:

[0078] Pure electric drive mode: the engine does not work, the drive motor (E) works, driving the reduction mechanism and the rear axle 5 to reduce speed and increase torque to achieve wheel drive.

[0079] As shown in Table 1, A1-1.1 Pure electric drive first gear mode power flow: the drive motor 4 drives the drive motor shaft 10 to rotate, the drive motor shaft 10 drives the constant mesh driving gear 15 to rotate, the constant mesh driving gear 15 drives the constant mesh driven gear 16 to rotate, the constant mesh driving gear 16 drives the intermediate shaft 9 to rotate, the intermediate shaft 9 drives the first electromagnetic shift gear sleeve 21, the first electromagnetic shift gear sleeve 21 drives the first gear engagement teeth 23, the first gear engagement teeth 23 drives the first gear driving gear 19, the first gear driving gear 19 drives the first gear driven gear 20, the first gear driven gear 20 drives the output shaft 8 to rotate, and the output shaft 8 drives the rear axle 5 to realize wheel drive. In this process, the first electromagnetic shift gear sleeve 21 is controlled to push and engage with the first gear engagement teeth 23 and is placed in an engaged state.

[0080] As shown in Table 1, A2-1.2 Pure electric drive second gear mode power flow: the drive motor 4 drives the drive motor shaft 10 to rotate, the drive motor shaft 10 drives the constant mesh driving gear 15 to rotate, the constant mesh driving gear 15 drives the constant mesh driven gear 16 to rotate, the constant mesh driving gear 16 drives the intermediate shaft 9 to rotate, the intermediate shaft 9 drives the first electromagnetic shift gear sleeve 21, the first electromagnetic shift gear sleeve 21 drives the second gear engagement teeth 22, the second gear engagement teeth 22 drives the second gear driving gear 17, the second gear driving gear 17 drives the second gear driven gear 18, the second gear driven gear 18 drives the output shaft 8 to rotate, and the output shaft 8 drives the rear axle 5 to realize wheel drive. In this process, the first electromagnetic shift gear sleeve 21 is controlled to push and engage with the second gear engagement teeth 22 and is placed in an engaged state.

[0081] Engine drive mode: The engine drive realizes power transmission through planetary gears, disconnection mechanism and generator motor control, which can realize the power split (PS) function, that is, the engine stepless speed regulation drive.

[0082] As shown in Table 1, B1-2.1 Power Split PS Engine Drive Mode Power Flow: Engine 1 drives the crankshaft flywheel assembly, the crankshaft flywheel assembly drives the power input shaft 6 to rotate, the power input shaft 6 drives the planetary carrier 12 to rotate, the planetary carrier 12 drives the planetary gear 13 to rotate, the planetary gear 13 drives the sun gear 14 and the ring gear 11 to rotate, the sun gear 14 drives the generator motor shaft 7 to rotate, thereby driving the generator motor 3 to generate electricity to charge the battery system, and at the same time the generator motor 3 can adjust the output speed of the ring gear 11, the ring gear 11 drives the output shaft 8 to rotate and transmit power, at this time the ring gear clutch 26 is engaged, and the output shaft 8 drives the rear axle 5 to realize wheel drive. In this process, the sun gear brake 24, the ring gear brake 25, and the planetary carrier clutch 27 are placed in a non-engaged state.

[0083] As shown in Table 1, 2.2 P13 engine drive mode power flow (fixed speed ratio output P13 mode): The engine drive realizes power transmission through planetary gears and disconnection mechanism and generator motor control, and can realize the P13 function, that is, the engine power is transmitted through the planetary gears and disconnection mechanism with a fixed speed ratio output.

[0084] As shown in Table 1, B2-2.2.1 P13 engine driven direct gear power flow: In this process, the sun gear brake 24, the ring gear brake 25, and the planetary carrier clutch 27 are engaged, and the ring gear clutch 26 is disengaged. The engine 1 drives the crankshaft flywheel assembly, the crankshaft flywheel assembly drives the power input shaft 6 to rotate, the power input shaft 6 drives the planetary carrier 12 to rotate, and the power output shaft 8 is driven to rotate and transmit power through the planetary carrier 12 and the planetary carrier clutch 27, and the power output shaft 8 drives the rear axle 5 to realize wheel drive.

[0085] As shown in Table 1, B3-2.2.2 P13 engine drive overdrive power flow: In this process, the sun gear brake 24 and the ring gear clutch 26 are engaged, and the planetary carrier clutch 27 and the ring gear brake 25 are disengaged. The engine 1 drives the crankshaft flywheel assembly, the crankshaft flywheel assembly drives the power input shaft 6 to rotate, the power input shaft 6 drives the planetary carrier 12 to rotate, the planetary carrier 12 drives the sun gear 14 and the ring gear 11 to rotate, and drives the output shaft 8 to rotate and transmit power through the ring gear clutch 26, and the output shaft (8) drives the rear axle 5 to realize wheel drive.

[0086] Hybrid mode:

[0087] As shown in Table 1, 3.1 Power Split (PS) Mode Hybrid Drive: Working Mode: The engine works, drives the generator motor to charge the battery system through the planetary gear and the disconnection mechanism, and drives the power output shaft 8 to achieve deceleration through the rear axle 5 to achieve wheel drive; at the same time, the drive motor works to drive the deceleration mechanism and the rear axle 5 to decelerate, and achieve wheel drive. The process distributes power by controlling the engine, generator motor, planetary gear and disconnection mechanism; according to the needs of power and economy, the drive motor selects pure electric drive first gear or second gear drive through the deceleration mechanism.

[0088] As shown in Table 1, 3.2 Fixed speed ratio output (P13) mode hybrid drive: Working mode: According to the needs of power and economy, the engine drive mode overdrive gear and the engine drive mode overdrive gear can be selected to be combined with the pure electric drive mode first gear and the pure electric drive mode second gear for power transmission.

[0089] Power generation mode:

[0090] As shown in Table 1, E1-4.1 Direct engine power generation: The engine drives the generator motor 3 to charge the battery through the planetary gear and the disconnect mechanism, and converts all the engine power into battery power. Direct engine power generation power flow.

[0091] During this process, the sun gear brake 24 and the ring gear brake 25 are engaged, and the planetary carrier clutch 27 and the ring gear clutch 26 are disengaged. The engine 1 drives the crankshaft flywheel assembly, the crankshaft flywheel assembly drives the power input shaft 6 to rotate, the power input shaft 6 drives the planetary carrier 12 to rotate, and the planetary carrier 12 drives the sun gear (14), the generator motor shaft 7, and the generator motor 3 to charge the battery.

[0092] As shown in Table 1, E2-4.2 Power Split PS Power Generation Mode Condition: In the power split PS mode, the engine drives the generator motor 3 to charge the battery through the planetary gear and the disconnect mechanism, and converts all or part of the engine power into battery power. Power generation power flow under the power split PS mode condition: Same as "2.1 Engine Drive Mode Power Flow (Power Split PS Mode)".

[0093] As shown in Table 1, E3-4.3 P13 direct gear power generation mode: In the fixed speed ratio output (P13) mode, the engine drives the generator motor 3 to charge the battery through the planetary gear and the disconnect mechanism, and converts all or part of the engine power into battery power. The power flow of power generation in the fixed speed ratio output (P13) mode is the same as "2.2.1 Engine drive mode direct gear power flow".

[0094] Energy recovery mode:

[0095] Working mode: The engine and generator motor are not working. The vehicle brakes and decelerates, and the wheels reversely drive the rear axle 5 and the deceleration mechanism, thereby driving the drive motor to achieve energy recovery.

[0096] Power flow: the wheels reverse drive the rear axle 5, the rear axle 5 drives the power output shaft 8 to rotate, and the drive motor shaft 10 is driven to rotate in the first gear or second gear power path to drive the drive motor 4 to charge the battery system to achieve energy recovery.

[0097] It can be seen that the present invention provides a multi-mode hybrid drive transmission control method, which realizes multi-mode power distribution and transmission through the combination of an engine, a generator motor, a transmission device, a reduction mechanism, a drive motor and a rear axle; solves the problem of poor high-speed economy of existing hybrid vehicles, can improve the power distribution efficiency of hybrid vehicles, shorten the switching time, and improve the vehicle's energy-saving and consumption-reduction performance.

[0098] The above describes in detail the structure, features and effects of the present invention based on the embodiments shown in the drawings. The above is only a preferred embodiment of the present invention, but the present invention is not limited to the scope of implementation shown in the drawings. Any changes made in accordance with the concept of the present invention, or modifications to equivalent embodiments with equivalent changes, which still do not exceed the spirit covered by the description and drawings, should be within the protection scope of the present invention.

Claims

1. A multi-mode hybrid drive transmission control system, characterized in that: include: Engine, generator motor, transmission, reduction mechanism, drive motor and rear axle; The engine is drivingly connected to the power input shaft, and the generator motor and the transmission device are arranged on the power input shaft; The power output shaft is in driving connection with the transmission device, the drive motor, the reduction mechanism and the rear axle are arranged on the power output shaft, and can be selectively linked with the connecting shaft of the transmission device, the drive motor and / or the intermediate shaft of the reduction mechanism; The engine drives the transmission device to charge the generator motor, and the transmission device transmits power to the rear axle through the power output shaft to drive the wheels; The driving motor drives the wheels by driving the reduction mechanism and the rear axle.

2. The multi-mode hybrid drive transmission control system according to claim 1, characterized in that: The transmission device is a planetary gear and a disconnect mechanism, and the planetary gear and the disconnect mechanism are arranged between the engine and the drive motor, so that when the engine speed increases, the generator motor is driven to charge and at the same time power is provided to the wheels.

3. The multi-mode hybrid drive transmission control system according to claim 2, characterized in that: The planetary gear and disconnection mechanism include: a planet carrier, a planetary wheel, a ring gear, a sun wheel, a sun wheel brake, a ring gear brake and a planet carrier clutch; The planet carrier is fixed to the power input shaft and connected to the engine flywheel, and the planetary gear transmits the output power of the engine through the planet carrier; The ring gear is arranged on the power output shaft, and the sun gear is connected to the generator motor shaft via a spline; The sun gear brake and the ring gear brake are provided to lock or disconnect the sun gear and the ring gear respectively; A planetary carrier clutch is provided to control the engagement or disengagement of the ring gear and the planetary carrier.

4. The multi-mode hybrid drive transmission control system according to claim 3, characterized in that: The speed reduction mechanism is connected to the drive motor via the drive motor shaft. The drive motor shaft is provided with the gear and is assembled and connected with the rotor of the drive motor.

5. The multi-mode hybrid drive transmission control system according to claim 4, characterized in that: Also includes: Engine controller, dual motor controller and vehicle controller; The engine controller is connected to the engine signal and is used to control the operation of the engine; The dual-motor controller is respectively connected to the generator motor and the drive motor for signal control of the operation of the generator motor and the drive motor; The vehicle controller is respectively connected to the engine controller, the dual-motor controller, the transmission device and the deceleration mechanism signals to coordinate the engine controller and the dual-motor controller according to the vehicle road conditions, throttle, and battery electrical status, and directly controls the engagement and disconnection of the planetary gears and the disconnection mechanism to achieve power drive in each driving mode.

6. A multi-mode hybrid power transmission control method, using the drive transmission control system according to claim 5, characterized in that: Also includes: The drive transmission control system is set to have a pure electric drive mode, an engine drive mode, a hybrid mode, a power generation mode and an energy recovery mode; A drive mode matrix table is set, and the vehicle controller coordinates and controls the engine controller and the dual motor controller according to the set control strategy, and controls the engagement or disconnection of the planetary gear and the disconnection mechanism and the first electromagnetic shift sleeve according to the drive mode matrix table and the drive mode to achieve power drive in each drive mode.

7. The multi-mode hybrid drive transmission control method according to claim 6, characterized in that: Also includes: The pure electric driving mode is set to a pure electric driving first gear mode power flow and a pure electric driving second gear mode power flow, so as to perform hierarchical control on the power flow; In the pure electric drive mode, the engine does not work and the drive motor works, and the planetary gear and the disconnection mechanism are controlled to engage and disengage to drive the reduction mechanism and the rear axle to reduce speed and increase torque, thereby realizing wheel drive; In the engine drive mode, power transmission is achieved through the engine drive planetary gears and the disconnect mechanism and the generator motor, and layered control is performed with power split PS engine drive mode power flow, P13 engine drive mode power flow, P13 engine drive direct gear power flow or P13 engine drive overdrive gear power flow.

8. The multi-mode hybrid drive transmission control method according to claim 7, characterized in that: Also includes: Set the hybrid mode to power split mode and fixed speed ratio output mode; The power split mode drives the engine with the power split PS engine drive mode power flow, and controls the drive motor with the pure electric drive first gear mode power flow and the pure electric drive second gear mode power flow; The fixed speed ratio output mode drives the engine with a P13 engine driven direct gear power flow or a P13 engine driven overdrive gear power flow, and controls the drive motor with a pure electric drive first gear mode power flow or a pure electric drive second gear mode power flow.

9. The multi-mode hybrid drive transmission control method according to claim 8, characterized in that: Also includes: Set the power generation mode to engine direct power generation mode, power split PS power generation mode and P13 direct gear power generation mode; In the engine direct power generation mode, the engine drives the generator motor to charge the battery through the planetary gear and the disconnect mechanism, and converts all the engine power into battery power; In the power split PS power generation mode or the P13 direct gear power generation mode, the engine drives the generator motor to charge the battery through the planetary gear and the disconnect mechanism, and converts all or part of the engine power into battery power.

10. The multi-mode hybrid drive transmission control method according to claim 9, characterized in that: Also includes: In energy recovery mode, the engine and generator motor do not work, the vehicle brakes and slows down, the wheels reverse-drive the rear axle and the reduction mechanism, the rear axle drives the output shaft to rotate, and the drive motor shaft is driven to rotate in the first or second gear power path, thereby driving the drive motor to achieve energy recovery.

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