A hybrid vehicle IPU

Abstract

The present invention discloses a hybrid vehicle IPU, which belongs to the field of vehicle technology. The hybrid vehicle IPU includes: an engine, a main motor, a clutch, a front transmission gear set, a planetary gear set, an auxiliary motor, a rear transmission gear set, a hydraulic pump, an air compressor and an air conditioning compressor. The engine and the main motor are directly connected. The main motor and the auxiliary motor are connected through a clutch, a front transmission gear set and a planetary gear set. On the one hand, it serves as a power source for a series hybrid vehicle, and on the other hand, it integrates multiple motors required for a traditional vehicle electric air compressor, an electric air conditioning compressor, an electric steering pump and an electric hydraulic pump, thereby reducing the weight of components and occupying vehicle space. The power of the auxiliary motor and the main motor is separated and engaged through a clutch. When the auxiliary motor fails, it can be driven by the main motor instead; when the main motor fails, the auxiliary motor can meet the emergency starting and power generation functions, thereby improving the reliability of the IPU.

Description

Technical Field

[0001] The present invention belongs to the field of vehicle technology, and specifically relates to a hybrid vehicle IPU, which is particularly suitable for a series hybrid vehicle with hydraulic drive, compressed air, and air conditioning refrigeration function requirements. Background Art

[0002] Traditional fuel vehicles use internal combustion engines as their power source. When the vehicle requires hydraulic drive (such as hydraulic power steering), compressed air, air conditioning and other refrigeration functions, the hydraulic pump, air compressor, air conditioning compressor and other equipment are mainly driven directly by the engine. The specific implementation method is that the free end and flywheel end of the engine are equipped with a gear system or a pulley system for outputting the engine crankshaft power and adjusting the speed, and the gear system or pulley system transmits the power to the hydraulic pump, air compressor and air conditioning compressor. The advantage of this method is that the power of the internal combustion engine is directly transmitted to the hydraulic pump, air compressor and air conditioning compressor through mechanical transmission, with high transmission efficiency and high system integration.

[0003] With the development of technology, hybrid vehicles use both electric motors and engines as hybrid devices. Through energy storage devices such as power batteries and energy distribution and drive control systems, the hybrid devices are coordinated to achieve high performance and low fuel consumption characteristics of the vehicle. As an important configuration of hybrid power systems, series hybrid power has been widely used in heavy trucks, buses, military vehicles and other fields.

[0004] When a series hybrid vehicle is running in a pure electric state, the hydraulic pump, air compressor, air conditioning compressor and other equipment cannot be directly driven by the engine. At present, the solution of integrating the corresponding equipment with an independent motor is generally adopted to solve this problem, that is, the hydraulic pump, air compressor and air conditioning compressor directly driven by the engine of traditional fuel vehicles are replaced by independent electric hydraulic pumps, electric air compressors and electric air conditioning compressors.

[0005] The electric hydraulic pump, electric air compressor, electric air conditioning compressor and other equipment currently used in series hybrid vehicles are independent of the engine and driven by the motor. They can realize the functions of hydraulic steering assistance, braking power, refrigeration energy and other functions in pure electric driving, but there are also some shortcomings, including:

[0006] 1. The separately installed electric hydraulic pump, electric air compressor, electric air-conditioning compressor and other equipment are heavier than the hydraulic pump, air compressor and air-conditioning compressor systems directly driven by the engine of traditional fuel vehicles, which has an adverse effect on the curb weight of the vehicle.

[0007] 2. Compared with the hydraulic pumps, air compressors, and air-conditioning compressors that are directly driven by the engine of traditional fuel vehicles, separately installed electric hydraulic pumps, electric air compressors, and electric air-conditioning compressors have added multiple motors and motor drive controllers. For vehicles with stricter vehicle space requirements, they occupy other effective space inside the vehicle.

[0008] 3. Separately installed electric hydraulic pumps, electric air compressors, electric air-conditioning compressors and other equipment use high-voltage electric drive. Compared with direct engine drive, there is a loss of electric energy conversion efficiency in power generation efficiency and inverter efficiency, and energy consumption increases. Summary of the invention

[0009] The main purpose of the present invention is to solve the problem raised in the background technology: when a series hybrid vehicle is running in a pure electric state, the hydraulic pump, air compressor, air conditioning compressor and other equipment cannot be directly driven by the engine. The current series hybrid vehicle is independent of the engine and driven by a motor, which can realize the functions of hydraulic steering assistance, braking power, refrigeration energy and other functions in a pure electric state, but there are also some shortcomings: adding multiple motors and motor drive controllers, increasing weight, occupying effective space, and increasing energy consumption.

[0010] The present invention provides a hybrid vehicle IPU (Integrated Power Unit), which, in addition to the functions of a conventional hybrid vehicle (IPU) integrated power unit, also has auxiliary functions such as providing hydraulic energy, compressed air energy, and refrigerant compression.

[0011] Compared with hybrid vehicles equipped with traditional IPU and separately provided electric hydraulic pump, electric air compressor, electric air conditioning compressor and other equipment, the present invention has the advantages of light weight, small size, high efficiency and high reliability.

[0012] To achieve the above objectives, the present invention provides the following technical solutions.

[0013] A hybrid vehicle IPU (integrated power unit) comprises an engine, a main motor, a clutch, a front transmission gear set, a planetary gear set, an auxiliary motor, a rear transmission gear set, a hydraulic pump, an air compressor and an air conditioning compressor; the engine and the main motor are directly connected through a mechanical device; the main motor, the clutch, the front transmission gear set, the planetary gear set, the auxiliary motor and the rear transmission gear set are connected in series in sequence; the front end of the clutch is connected to the main motor, and the rear end is connected to the front transmission gear set, which is used to transmit and cut off the power between the main motor and the subsequent part; the front transmission gear set is composed of a front transmission central gear, a front output gear 1, and a front output gear 2, and the front transmission central gear (41) drives the front output gear 1 and the front output gear 2 to transmit the speed-adjusted power to the hydraulic pump and the air compressor respectively. The planetary gear set is composed of a sun gear, a planetary gear, a planetary frame and a gear ring, wherein the gear ring is fixed. The planetary gear set is connected to the auxiliary motor through the sun gear, and is connected to the front transmission gear set through the planetary frame, which is used to match the speed between the main motor and the auxiliary motor. The auxiliary motor is composed of a stator and a rotor. The front end of the rotor is connected to the planetary gear set, and the rear end is connected to the rear transmission gear set. The rear transmission gear set is composed of a rear output gear 1 and a rear output gear 2, and is used to transmit the power for adjusting the speed to the air-conditioning compressor.

[0014] The air conditioning compressor consists of the air conditioning compressor body and the electromagnetic clutch.

[0015] The main structure of the hybrid vehicle IPU is that, in addition to the engine (1) and the main motor (2), it also includes another motor - an auxiliary motor (4).

[0016] The combination of the engine and the main motor plays the role of IPU power generation in a conventional series hybrid vehicle. The engine is directly connected to the main motor. After the engine is reverse-driven by the main motor to start and run, it drags the main motor to generate electricity. The main motor includes two power input and output interfaces at the front and rear ends. The front interface is directly connected to the engine in the aforementioned manner, and the rear interface is connected to the auxiliary motor through a transmission mechanism such as a clutch. The front and rear interfaces of the main motor are rigidly integrated with the rotor of the main motor. When the clutch is in the disengaged state, the main motor and the auxiliary motor operate independently without affecting each other; when the clutch is in the engaged state, the main motor and the auxiliary motor operate in parallel through the transmission mechanism between the two. The transmission mechanism between the main motor and the auxiliary motor includes a clutch, a front transmission gear set and a planetary gear. The sun gear of the planetary gear set is connected to the motor rotor, the ring gear is fixed, and the planetary gear frame is connected to the center gear of the front transmission gear set. The front transmission center gear of the front transmission gear set is meshed and connected with the front output gear 1 and the front output gear 2, and is directly connected to the clutch. When the clutch is in the disengaged state, when the auxiliary motor works independently, the aforementioned planetary gear set reduces the speed of the auxiliary motor, and transmits the power after matching the speed to the hydraulic pump and the air compressor through the output gear. When the clutch is engaged, the planetary gearbox transmits power to the hydraulic pump and air compressor, and also establishes a transmission speed ratio between the main motor and the auxiliary motor when the motor is in parallel operation. The speed change output mechanism at the rear end of the auxiliary motor is connected to the air conditioning compressor through a gear change.

[0017] It has multiple output interfaces, which are respectively connected to a hydraulic pump (8), an air compressor (9), and an air conditioning compressor (10).

[0018] The engine is a diesel engine.

[0019] The main motor and the auxiliary motor are connected to their respective controllers through wires, and the controller is connected to the high-voltage power distribution device, the power battery pack, and the external power supply device through wires.

[0020] The main motor and the auxiliary motor are permanent magnet synchronous motors.

[0021] The advantages of the present invention are as follows: the engine plus the main motor, the auxiliary motor and the transmission mechanism form an IPU theme, the hydraulic pump, the air compressor and the air-conditioning compressor are connected to the IPU theme together, and a common motor drive is used. Through the engagement and disengagement of the clutch and the different working modes of the main motor and the auxiliary motor, the system efficiency can be improved, the system weight can be reduced, and the system size can be reduced. At the same time, through multi-mode operation, the main motor and the auxiliary motor can back up each other and have higher reliability.

[0022] The following describes the working mode of the IPU of a hybrid vehicle.

[0023] Mode 1 (pure electric driving): When the series hybrid vehicle is in pure electric driving, the power required for the vehicle to drive is all provided by the power battery. At this time, the IPU clutch of the hybrid vehicle is in a disengaged state according to the controller command, the engine and the main motor are both in a stopped state, and the auxiliary motor starts running by converting the power of the power battery through the controller. In the pure electric driving state of the vehicle, the hydraulic pump, air compressor, and air conditioning compressor are driven to keep the vehicle in a normal driving state.

[0024] Mode 2 (hybrid driving): When a series hybrid vehicle is in hybrid driving, the power required for the vehicle to drive is provided by the IPU and the power battery. At this time, the IPU clutch of the hybrid vehicle is in an engaged state according to the controller command, the engine and the main motor are in a running and generating state, the auxiliary motor is not working, and the main motor is dragged through the clutch and is in an idling state. At this time, the power is directly transmitted from the engine to the hydraulic pump, air compressor, and air conditioning compressor through a mechanical transmission device, with high mechanical efficiency.

[0025] Mode 3 (main motor failure): When the main motor fails and cannot operate, the IPU clutch of the hybrid vehicle is in an engaged state according to the controller command. The auxiliary motor not only drives the hydraulic pump, air compressor, and air-conditioning compressor, but also serves as a backup for the main motor. On the one hand, the auxiliary motor can transmit power to the engine crankshaft through the planetary gear set, front drive gear set, clutch, and main motor rotor to start the engine. On the other hand, after the engine starts running, the power is driven by the main motor rotor, clutch, front drive gear set, and planetary gear set to drive the auxiliary motor to generate electricity, providing electrical energy for vehicle driving and operation within a certain range, thereby improving system reliability.

[0026] Mode 4 (auxiliary motor failure): When the auxiliary motor fails and cannot operate, the IPU clutch of the hybrid vehicle is in an engaged state according to the controller command, and the engine power is transmitted through the main motor rotor and the clutch to drag the auxiliary motor, and transmits power to the steering pump, air compressor, and air-conditioning compressor to ensure the normal operation of vehicle-related functions and improve system reliability.

[0027] Mode 5 (Parking Power Generation): When the vehicle is parked and needs to output electric energy, the IPU clutch of the hybrid vehicle is in a disengaged state according to the controller command, and the engine drives the main motor to generate electricity, which is converted by the vehicle's high-voltage power distribution system and then output to the outside. In this mode, the auxiliary motor does not work. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 It is a structural schematic diagram of a hybrid vehicle IPU for implementing the solution of the present invention.

[0029] Figure 2 This is a schematic diagram of the power flow when the clutch is disengaged and the auxiliary motor independently drives the hydraulic pump, air compressor, and air-conditioning compressor in mode 1 (the vehicle is running on pure electricity).

[0030] Figure 3 In mode 2 (hybrid driving), the clutch is engaged, and the main motor directly drives the hydraulic pump, air compressor, and air compressor, and the power flow diagram of the engine driving the main motor to generate electricity.

[0031] Figure 4 In mode 3 (main motor failure), the clutch engages, the auxiliary motor drives the hydraulic pump, air compressor, and air-conditioning compressor, the auxiliary motor starts the engine, and the engine drags the auxiliary motor for auxiliary power generation. This is a power flow diagram.

[0032] Figure 5 In mode 4 (auxiliary motor failure), the clutch is engaged, and the engine drags the auxiliary motor to drive the hydraulic pump, air compressor, and air-conditioning compressor. Schematic diagram of power flow.

[0033] Figure 6 In mode 5 (parking power generation), the clutch is disengaged to realize the power flow diagram of parking power generation and external power output functions.

[0034] 8-Hydraulic pump, 9-Air compressor, 10-Air conditioning compressor, 11-Power battery pack, 12-High voltage power distribution device, 13-Controller I, 14-Controller II, 15-External power supply device DETAILED DESCRIPTION

[0035] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the accompanying drawings in the embodiments of the present invention. The described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0036] Figure 1The figure shows a representative embodiment of a hybrid IPU for implementing the scheme of the present invention. The crankshaft of the engine (1) is directly connected to the front end of the rotor (22) of the main motor (2), and the crankshaft of the engine (1) and the rotor (2) of the main motor run at the same speed. The rear end of the rotor (22) of the main motor (2) is connected to the clutch (3). The clutch (3) is separated and engaged according to different instructions, so that the rotation of the rotor (22) of the main motor (2) is disconnected and connected with the rotation of the auxiliary motor (6). The rear end of the clutch (3) is connected to the front transmission center gear (51) of the front transmission gear set (4). The front transmission center gear (51) is also meshed with the front output gear 1 (42) and the front output gear 2 (43) respectively, and drives the hydraulic pump (8) and the air compressor (9) to output suitable speeds respectively. The rear end of the front transmission center gear (51) is connected to the planetary gear frame (53) of the planetary gear (5). The planetary gear (5) is composed of a sun gear (51), a planetary gear (52), a planetary gear frame (53) and a ring gear (54). The planetary gear (5) is a speed-increasing planetary gear for the main motor (2) to the auxiliary motor (6), and is a speed-reducing planetary gear for the auxiliary motor (6). The front output end of the motor rotor (62) of the auxiliary motor (6) is connected to the sun gear (51), and the rear output end is connected to the rear output gear 1 (71). The rear output gear 1 (71) is connected to the rear output gear 2 (72), and transmits the appropriate speed and torque to the air conditioner compressor body (101) through the electromagnetic clutch (102).

[0037] Figures 2 to 6 Shown is a schematic diagram of a hybrid IPU composition and power flow under different operating modes for implementing the solution of the present invention. Figure 2 In the embodiment of the present invention, the clutch (3) is disengaged, and the electric energy drives the auxiliary motor rotor (62) to rotate through the power battery pack (11), the high-voltage power distribution device (12), and the controller II (14). The power of the auxiliary motor rotor (62) passes through the sun gear (51), the planetary gear (52), and the planetary frame output gear (53) of the planetary gear (5), and is output to the central gear (41) of the front transmission gear set (4) after deceleration. After passing through the front output gear 1 (42) and the front output gear 2 (43), the hydraulic pump (8) and the air compressor (9) are driven respectively. After passing through the rear output gear 1 (71) and the rear output gear (72), the power of the auxiliary motor rotor (62) drives the air conditioning compressor (10), thereby realizing the driving function of the hydraulic pump, the air compressor, and the air conditioning compressor when the vehicle is running purely electrically. Figure 3In the embodiment of the present invention, the clutch (3) is engaged, the output power of the engine (1) drives the main motor (2) to generate electricity, and the electric energy is transmitted through the controller I (13), the high-voltage power distribution device (12), and the power battery pack (11) to realize the function of providing the electric energy required for the vehicle to travel; the output power of the engine (1) is transmitted to the front output gear 1 (42) and the front output gear 2 (43) through the rotor (22) of the main motor (2), the clutch (3), and the front transmission center gear (41), thereby driving the hydraulic pump (8) and the air compressor (9); ...). The power is transmitted from the central gear (41), the planetary gear frame (53) of the planetary gear row (5), the planetary gear (53) and the sun gear (51) to the auxiliary motor rotor (62), and the auxiliary motor rotor (62) drives the rear output gear 1 (71) and the rear output gear 2 (72) to drive the air-conditioning compressor (10). The air-conditioning compressor (10) separates and engages the electromagnetic clutch (102) according to the working condition requirements to control the working state of the air-conditioning compressor body (101). Through the above process, the power generation function of the IPU and the driving function of the hydraulic pump (8), the air compressor (9) and the air-conditioning compressor (10) are realized in the hybrid power mode. Figure 4 In the embodiment of the present invention, the clutch (3) is engaged, the electric energy of the power battery pack (11) drives the auxiliary motor rotor (62) to rotate through the high-voltage power distribution device (12) and the controller II (14), and the power of the auxiliary motor rotor (62) drives the engine (1) through the sun gear (51), the planetary gear (53), the planetary gear frame (53), the front transmission center gear (41), the clutch (3), and the main motor rotor (22), thereby realizing the function of starting the engine in the event of a failure of the main motor (2); after the engine (1) is started and operated, the power of the engine (1) drives the auxiliary motor rotor (62) through the main motor rotor (22), the clutch (3), the front transmission center gear (41), the planetary gear frame (53), the planetary gear (52), and the sun gear, thereby causing the auxiliary motor (6) to generate electricity, and the electric energy drives the auxiliary motor (6) through the controller II (14), the high-voltage power distribution device (12), and the power battery pack (11), thereby realizing the auxiliary power generation function of the auxiliary motor (6) driven by the engine (1) in the event of a failure of the main motor (2); the power of the engine (1) drives the auxiliary motor (6) through the sun gear (51), the planetary gear frame (53), the planetary gear (52), and the sun gear, thereby realizing the auxiliary power generation function of the auxiliary motor (6) driven by the engine (1) in the event of a failure of the main motor (2); Figure 3 The method described above realizes the function of driving the hydraulic pump (8), the air compressor (9) and the air conditioning compressor (10) in the event of a failure of the main motor (2). Figure 5In the embodiment of the present invention, the clutch (3) is engaged, and after the engine (1) starts to run, the power of the engine (1) drives the hydraulic pump (8) and the air compressor (9) respectively through the main motor rotor (22), the clutch (3), the front transmission center gear (41), the front output gear 1 (42) and the front output gear 2 (43); the front transmission center gear (41) also transmits the power through the planetary gear (5) and the auxiliary motor rotor (62) to the rear output gear 1 (71) and the rear output gear 2 (72), and then drives the air conditioning compressor (10), thereby realizing the function of the engine (1) directly driving the hydraulic pump (8), the air compressor (9) and the air conditioning compressor (10) when the auxiliary motor fails. Figure 6 In the embodiment of the present invention, the clutch (3) is disengaged, the engine (1) drives the main motor (2) to generate electricity, and the electric energy is output to the external device through the controller I (13), the high-voltage power distribution device (12), and the external power supply device (15), thereby realizing the function of supplying power to the outside of the vehicle when the vehicle is parked.

[0038] A hybrid vehicle IPU is used as a power source for a series hybrid vehicle. On the other hand, it integrates multiple motors required for electric air compressors, electric air conditioning compressors, electric steering pumps, and electric hydraulic pumps of traditional vehicles, reducing the weight of components and the space occupied by the vehicle. The power of the auxiliary motor and the main motor is separated and engaged through the clutch. When the auxiliary motor fails, the main motor can replace the drive; when the main motor fails, the auxiliary motor can meet the emergency starting and power generation functions, improving the reliability of the IPU.

Claims

1. A hybrid vehicle IPU, characterized in that: It comprises an engine (1), a main motor (2), a clutch (3), a front transmission gear set (4), a planetary gear set (5), an auxiliary motor (6), a rear transmission gear set (7), a hydraulic pump (8), an air compressor (9) and an air conditioning compressor (10); The engine (1) is connected to the main motor (2); the main motor (2), the clutch (3), the front transmission gear set (4), the planetary gear set (5), the auxiliary motor (6) and the rear transmission gear set (7) are sequentially connected in series; The front end of the clutch (3) is connected to the main motor (2), and the rear end is connected to the front transmission gear set (4), and is used to transmit and cut off the power between the main motor (2) and the subsequent parts; The front transmission gear set (4) is composed of a front transmission center gear (41), a front output gear 1 (42), and a front output gear 2 (43). The front transmission center gear (41) drives the front output gear 1 (42) and the front output gear 2 (43) to transmit the power after the speed adjustment to the hydraulic pump (8) and the air compressor (9) respectively. The planetary gear (5) is composed of a sun gear (51), a planetary gear (52), a planetary frame (53) and a ring gear (54), wherein the ring gear (54) is fixed; the planetary gear (5) is connected to the auxiliary motor (6) through the sun gear (51), and is connected to the front transmission gear set (4) through the planetary frame (53), so as to match the rotation speed between the main motor (2) and the auxiliary motor (6); The auxiliary motor (6) is composed of a stator (61) and a rotor (62), wherein the front end of the rotor (62) is connected to the planetary gear set (5), and the rear end is connected to the rear transmission gear set (7); The rear transmission gear set (7) is composed of a rear output gear 1 (71) and a rear output gear 2 (72), and is used to transmit the power for adjusting the rotation speed to the air-conditioning compressor (10); The IPU implements the following modes through the controller: When the clutch (3) is disengaged and the vehicle is running purely electrically, the power battery pack (11) drives the auxiliary motor, which drives the hydraulic pump, the air compressor, and the air-conditioning compressor; When the clutch (3) is engaged and the main motor and the auxiliary motor are operating normally, the engine (1) drives the main motor (2) to generate electricity, and the main motor directly drives the hydraulic pump (8), the air compressor (9), and the air conditioning compressor (10); When the main motor fails, the clutch engages; the auxiliary motor drives the hydraulic pump, air compressor, and air conditioning compressor, and the auxiliary motor starts the engine; The engine drives the auxiliary motor to perform auxiliary power generation function; When the auxiliary motor fails, the clutch engages; The engine drives the hydraulic pump, air compressor and air-conditioning compressor through the main motor rotor and clutch to drive the auxiliary motor.

2. A hybrid vehicle IPU as claimed in claim 1, characterized in that: The engine is directly connected to the main motor. After the engine is reverse-driven by the main motor to start running, it drives the main motor to generate electricity. The main motor includes two power input and output interfaces, the front end interface is directly connected to the engine, and the rear end interface is connected to the auxiliary motor through a clutch; When the clutch is in the disengaged state, the main motor and the auxiliary motor operate independently; When the clutch is in the engaged state, the main motor and the auxiliary motor run in parallel; When the clutch is in the engaged state, a transmission speed ratio for parallel operation is established between the main motor and the auxiliary motor.

3. A hybrid vehicle IPU as claimed in claim 1, characterized in that: A clutch (3) is provided between the main motor (2) and the auxiliary motor (6). The clutch (3) performs engagement and disengagement operations according to control instructions, thereby playing the role of power transmission and interruption between the main motor (2) and the auxiliary motor (6).

4. A hybrid vehicle IPU as claimed in claim 1, characterized in that: The auxiliary motor (6) is provided with a speed change gear mechanism at the front end and the rear end respectively; the planetary gear set (5) at the front end matches the motor speeds of the main motor (2) and the auxiliary motor (6); the front transmission gear set at the front end of the planetary gear set (5) matches the output speed with the speeds of the hydraulic pump (8) and the air compressor (9); and the rear transmission gear set (7) at the rear end of the auxiliary motor (6) matches the output speed with the air conditioning compressor (10).

5. A hybrid vehicle IPU as claimed in claim 1, characterized in that: The main motor and the auxiliary motor are respectively connected to their respective controllers through wires.

6. A hybrid vehicle IPU as claimed in claim 1, characterized in that: The air-conditioning compressor (10) is composed of an air-conditioning compressor body (101) and an electromagnetic clutch (102); The air-conditioning compressor (10) transmits and cuts off the power transmitted by the rear transmission gear set (7) through the electromagnetic clutch (102).

7. A hybrid vehicle IPU as claimed in claim 1, characterized in that: The main motor and the auxiliary motor are permanent magnet synchronous motors.

8. A hybrid vehicle IPU as claimed in claim 1, characterized in that: The planetary gear (5) is a speed-increasing planetary gear for the main motor (2) to the auxiliary motor (6), and is a speed-reducing planetary gear for the reverse direction.

9. A hybrid vehicle IPU as claimed in claim 1, characterized in that: When the main motor (2) fails, the clutch (3) is engaged, and the power battery pack (11) drives the auxiliary motor rotor (62) to rotate. The auxiliary motor can drive the engine (1) through the planetary gear set, the front transmission gear set, the clutch, and the main motor rotor to achieve the engine starting function.

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