Multi-gear hybrid power transmission system and transmission method thereof

Abstract

The invention discloses a multi-gear hybrid power transmission system and a transmission method thereof, and belongs to the technical field of hybrid transmissions. The engine is connected with the hydraulic torque converter, the hydraulic torque converter is connected with the input shaft, the input shaft is connected with the starting clutch, the starting clutch is connected with the single planet row, the single planet row is connected with the second clutch, the first clutch and the generator, the second clutch is connected with the Ravigneaux planetary gear train, and the first clutch is connected with the driving motor. The driving motor is connected with the Ravigneaux planetary gear train; the Ravigneaux planetary gear train is connected with the output shaft, the first brake and the second brake; the first brake, the second brake and the single planet row are all fixed on the shell; the transmission structure is simplified, the number of parts is reduced, the manufacturing difficulty is lowered, the power performance is enhanced, engine overload is avoided, the acceleration capacity and the energy efficiency level are improved, and the problems that in the prior art, the structure is complex, the efficiency is limited, and the power performance is insufficient are solved.

Description

TECHNICAL FIELD

[0001] The present application relates to a multi-gear hybrid power transmission system and its transmission method, belonging to the technical field of hybrid transmission. BACKGROUND

[0002] With the rapid development and technological innovation of the automotive industry, new energy hybrid power devices are increasingly widely used in the field of transmissions. As a highly integrated, high-performance and multi-mode oil-electric hybrid power transmission system, it can effectively realize the matching of various power combination modes of engines, generators and electric motors, and has become the main development direction of new energy vehicle technology.

[0003] However, the power transmission structure of existing hybrid power devices still has technical bottlenecks. In typical schemes, a pair of fixed ratio long meshing gears are commonly used as core transmission components. Due to the small speed ratio design of such gears, in order to meet the power demand under different driving conditions, a multi-gear transmission is additionally configured for speed ratio adjustment. This design significantly increases the complexity of the overall transmission system structure, increases the number of components, and increases the difficulty of processing and manufacturing. At the same time, due to the lengthening of the transmission chain and the loss of efficiency, it limits the further improvement of energy saving level to a certain extent. SUMMARY

[0004] To solve the problems in the background art, the present application provides a multi-gear hybrid power transmission system and its transmission method.

[0005] To achieve the above object, the present application adopts the following technical scheme: a multi-gear hybrid power transmission system, comprising an engine, a hydraulic torque converter, a starting clutch, a generator, an input shaft, a second clutch, a first clutch, a drive motor, an output shaft, a first brake, a second brake, a single planetary gear set and a Ravigneaux planetary gear set; the output end of the engine is connected with the input end of the hydraulic torque converter, the output end of the hydraulic torque converter is connected with the input end of the input shaft, the output end of the input shaft is connected with the inner hub of the starting clutch, the outer disc of the starting clutch is connected with the single planetary gear set, the single planetary gear set is connected with the inner hub of the second clutch, the inner hub of the first clutch and the generator, the outer disc of the second clutch is connected with the Ravigneaux planetary gear set, the outer disc of the first clutch is connected with the rotor of the drive motor, and the rotor of the drive motor is connected with the Ravigneaux planetary gear set; the Ravigneaux planetary gear set is connected with the output shaft, the first brake and the second brake; the first brake, the second brake and the single planetary gear set are all fixed on the housing; the single planetary gear set comprises a first sun gear, a first planetary gear, a first planetary carrier and a first outer ring gear; the first sun gear and the first planetary carrier are sleeved on the outer side of the input shaft, the first planetary carrier is connected with the outer disc of the starting clutch, the inner hub of the second clutch and the inner hub of the first clutch, the first planetary gear is installed on the first planetary carrier, the first planetary gear is in meshing connection with the first sun gear and the first outer ring gear, and the first outer ring gear is fixed on the housing; the first sun gear is connected with the rotor of the generator; the Ravigneaux planetary gear set comprises a second sun gear, a third sun gear, a short planetary gear, a long planetary gear, a second outer ring gear and a second planetary carrier; the second planetary carrier is connected with the outer disc of the second clutch and the first brake, the short planetary gear and the long planetary gear are installed on the second planetary carrier, the outer end of the long planetary gear is in meshing connection with the second outer ring gear, the second outer ring gear is connected with the output shaft, the inner end of the long planetary gear is in meshing connection with the short planetary gear and the second sun gear, the second sun gear is connected with the second brake, the short planetary gear is in meshing connection with the third sun gear, and the third sun gear is connected with the rotor of the drive motor.

[0006] The present application also provides a multi-gear hybrid power transmission system one-gear transmission method. S1: the generator and the drive motor are in a non-working state, the second clutch and the second brake are in a separated state, the starting clutch, the first clutch and the first brake are in a combined state, and the engine and the hydraulic torque converter are in a working state; S2: the engine is started, the engine power is output to the input shaft through the hydraulic torque converter, the input shaft combines the starting clutch and the first clutch to transmit power to the third sun gear to make the third sun gear rotate; S3: The third sun gear drives the long planetary gear to rotate through the meshed short planetary gear, and the long planetary gear rotates to generate a reverse rotating torque to the second planet carrier; S4: The long planetary gear drives the second outer gear ring to rotate through the meshing. S5: The second outer gear ring outputs the power through the output shaft.

[0007] The two-gear transmission method of the multi-gear hybrid power transmission system comprises the following steps: S1: The generator and the driving motor are in a non-working state, the first brake and the second brake are in a separated state, the start clutch, the first clutch and the second brake are in a combined state, and the engine and the hydraulic torque converter are in a working state; S2: The engine is started, the engine power is output to the input shaft through the hydraulic torque converter, the input shaft combines the start clutch and the first clutch, and the power is transmitted to the third sun gear to make the third sun gear rotate; S3: The third sun gear drives the long planetary gear to rotate through the meshed short planetary gear, and the long planetary gear rotates to generate a reverse rotating torque to the second planet carrier; S4: The long planetary gear drives the second outer gear ring to rotate through the meshing. S5: The second outer gear ring outputs the power through the output shaft.

[0008] The three-gear transmission method of the multi-gear hybrid power transmission system comprises the following steps: S1: The generator and the driving motor are in a non-working state, the first brake and the second brake are in a separated state, the start clutch, the second clutch and the first clutch are in a combined state, and the engine and the hydraulic torque converter are in a working state; S2: The engine is started, the engine power is output to the input shaft through the hydraulic torque converter, the input shaft combines the start clutch, the second clutch and the first clutch, and the power is transmitted to the third sun gear and the second planet carrier; S3: The short planetary gear and the long planetary gear are constrained and cannot rotate, but can only revolve with the third sun gear and the second planet carrier, and the revolving short planetary gear and long planetary gear drive the second outer gear ring to rotate; S4: The second outer gear ring outputs the power through the output shaft.

[0009] The four-gear transmission method of the multi-gear hybrid power transmission system comprises the following steps: S1: make the generator and the driving motor in non-working state, make the first clutch and the first brake in disengaged state, make the starting clutch, the second clutch and the second brake in engaged state, make the engine and the hydraulic torque converter in working state; S2: start the engine, the engine power is output to the input shaft through the hydraulic torque converter, the input shaft combines the starting clutch and the second clutch, and the power is transmitted to the second planet carrier to make the second planet carrier rotate; S3: the second planet carrier rotates to drive the long planet gear and the short planet gear to rotate, because the second brake is in working state, the second sun gear is fixed, the long planet gear and the short planet gear rotate around the second sun gear while rotating, and then drive the second outer gear ring to rotate; S4: the second outer gear ring outputs the power through the output shaft.

[0010] The application discloses a multi-gear hybrid power transmission system three-power-source driving mode gear transmission method. S1: make the second clutch and the second brake in disengaged state, make the starting clutch, the first clutch and the first brake in engaged state, make the engine, the generator and the driving motor in working state, and make the hydraulic torque converter in non-working state; S2: start the engine, the engine power is output to the input shaft through the hydraulic torque converter, and the power is coupled to the single planet gear through the starting clutch; the generator power is transmitted to the first clutch through the single planet gear, the input shaft combines the starting clutch and the first clutch, and the power output by the driving motor is combined; S3: the power combined by the generator and the driving motor is transmitted to the third sun gear, the third sun gear drives the long planet gear to rotate through the meshed short planet gear, and the long planet gear rotates to generate a torque in the opposite direction to the second planet carrier; S4: because the second planet carrier is connected with the first brake in engaged state and is fixed, the long planet gear drives the second outer gear ring meshed therewith to rotate; S5: the second outer gear ring outputs the power through the output shaft.

[0011] The application discloses a multi-gear hybrid power transmission system EV1 gear transmission method. S1: make the engine, the hydraulic torque converter and the generator in non-working state, make the starting clutch, the second clutch, the first clutch and the second brake in disengaged state, make the first brake in engaged state, and make the driving motor in working state; S2: the driving motor outputs power, and the power is transmitted to the third sun gear to make the third sun gear rotate; S3: the third sun gear drives the long planetary gear to rotate through the meshed short planetary gear, and the long planetary gear drives the second outer gear ring to rotate under the constraint; S4: the second outer gear ring outputs the power through the output shaft.

[0012] The EV2 gear transmission method of the multi-gear hybrid power transmission system comprises the following steps: S1: the engine, the hydraulic torque converter and the generator are in a non-working state, the start clutch, the second clutch, the first clutch and the first brake are in a separated state, the second brake is in a combined state, and the drive motor is in a working state; S2: the drive motor outputs the power, and transmits the power to the third sun gear to drive the third sun gear to rotate; S3: the third sun gear drives the long planetary gear to rotate through the meshed short planetary gear, and the long planetary gear drives the second outer gear ring to rotate under the constraint; S4: the long planetary gear drives the second outer gear ring to rotate through the compound motion; S5: the second outer gear ring outputs the power through the output shaft.

[0013] The double-motor EV1 gear transmission method of the multi-gear hybrid power transmission system comprises the following steps: S1: the engine and the hydraulic torque converter are in a non-working state, the start clutch, the second clutch and the second brake are in a separated state, the first clutch and the first brake are in a combined state, and the generator and the drive motor are in a working state; S2: the engine is started, the engine power is transmitted to the first clutch through the single planetary gear set, the power is transmitted to the drive motor through the first clutch, the power output by the drive motor is combined with the power transmitted by the generator, and the combined power is transmitted to the third sun gear to drive the third sun gear to rotate; S3: the third sun gear drives the long planetary gear to rotate through the meshed short planetary gear, and the long planetary gear drives the second outer gear ring to rotate under the constraint; S4: the second outer gear ring outputs the power through the output shaft.

[0014] The double-motor EV2 gear transmission method of the multi-gear hybrid power transmission system comprises the following steps: S1: the engine and the hydraulic torque converter are in a non-working state, the start clutch, the second clutch and the first brake are in a separated state, the first clutch and the second brake are in a combined state, and the generator and the drive motor are in a working state; S2: start the engine, the engine power is transmitted to the first clutch through the single planetary gear set, the power is transmitted to the drive motor through the first clutch, the power output by the drive motor and the power transmitted by the generator are combined and transmitted to the third sun gear, so that the third sun gear rotates; S3: the third sun gear drives the long planetary gear to rotate through the meshing short planetary gear; because the second brake is in the working state, the second sun gear is fixed, and the long planetary gear rotates synchronously while rotating; S4: the long planetary gear drives the second outer gear ring to rotate through the compound motion of rotation and revolution; S5: the second outer gear ring outputs the power through the output shaft.

[0015] The application discloses a multi-gear hybrid power transmission system ECVT gear transmission method. S1: the first clutch, the first brake and the second brake are in the separated state, the starting clutch and the second clutch are in the combined state, and the engine and the drive motor are in the working state; S2: power distribution and transmission under different working conditions: S201: low-speed running working condition: the engine power is transmitted to the input shaft through the hydraulic torque converter, and is coupled to the single planetary gear set through the starting clutch to be transmitted to the generator, so that energy is recovered; the drive motor serves as a power source, transmits power to the third sun gear, and drives the short planetary gear and the long planetary gear to rotate with the third sun gear, drives the second outer gear ring to rotate, and outputs the power through the output shaft; S202: normal running working condition: part of the engine power is transmitted to the generator through the input shaft; the other part is transmitted to the second planetary carrier through the input shaft and the second clutch, the second planetary carrier rotates, drives the long planetary gear and the short planetary gear to rotate, and then drives the second outer gear ring to rotate, and outputs the power through the output shaft; S203: full-speed running / accelerating working condition: the engine outputs full power, the drive motor supplements power, and the two cooperate to provide the power required for acceleration to drive the second outer gear ring to rotate, and output the power through the output shaft.

[0016] Compared with the prior art, the application has the following beneficial effects: The present application realizes the significant improvement of compact structure and transmission efficiency by integrating single planetary row and Ravigneaux planetary gear train, combining the cooperative control of multiple clutches and brakes. Compared with the complex transmission chain problem caused by the additional configuration of multiple gear transmission in the prior art, the present application effectively simplifies the transmission structure, reduces the number of parts, and reduces the manufacturing difficulty through the double planetary row structure and multi-gear design (four-gear engine drive, two-gear pure electric drive and ECVT mode). At the same time, through the flexible combination of power sources (three power sources of engine, generator and drive motor cooperative driving and double motor pure electric driving) and working condition adaptation (low-speed motor driving, high-speed engine direct driving, and motor power supplement during acceleration), the power performance is significantly enhanced, the engine overload is avoided, and the acceleration ability and energy efficiency level are improved. In addition, the present application also has the functions of energy recovery, parking power generation and ECVT stepless speed change, covering the driving demand in the whole speed range, taking into account the power performance and economy, solving the problems of complex structure, limited efficiency and insufficient power performance in the prior art. BRIEF DESCRIPTION OF DRAWINGS

[0017] Figure 1 is a structural schematic diagram of the present application; Figure 2 is a working schematic diagram of one-gear transmission; Figure 3 is a working schematic diagram of two-gear transmission; Figure 4 is a working schematic diagram of three-gear transmission; Figure 5 is a working schematic diagram of four-gear transmission; Figure 6 is a working schematic diagram of EV1 gear transmission; Figure 7 is a working schematic diagram of EV2 gear transmission; Figure 8 is a working schematic diagram of double motor EV1 gear transmission; Figure 9 is a working schematic diagram of double motor EV2 gear transmission; Figure 10 is a working schematic diagram of three power source driving mode; Figure 11 is a working schematic diagram of ECVT gear transmission. DETAILED DESCRIPTION

[0018] The technical solutions in the present application will be described clearly and completely in the embodiments of the present application combined with the drawings. Obviously, the described embodiments are only a part of the embodiments of the present application, not all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor are within the scope of protection of the present application.

[0019] A multi-gear hybrid power transmission system, comprising an engine 1, a hydraulic torque converter 2, a starting clutch 3, a generator 4, an input shaft 5, a second clutch 10, a first clutch 11, a drive motor 12, an output shaft 19, a first brake 20, a second brake 21, a single planetary gear set and a Ravigneaux planetary gear set; the output end of the engine 1 is connected with the input end of the hydraulic torque converter 2, the output end of the hydraulic torque converter 2 is connected with the input end of the input shaft 5, the output end of the input shaft 5 is connected with the inner hub of the starting clutch 3, the outer disc of the starting clutch 3 is connected with the single planetary gear set, the single planetary gear set is connected with the inner hub of the second clutch 10, the inner hub of the first clutch 11 and the generator 4, the outer disc of the second clutch 10 is connected with the Ravigneaux planetary gear set, the outer disc of the first clutch 11 is connected with the rotor of the drive motor 12, and the rotor of the drive motor 12 is connected with the Ravigneaux planetary gear set; the Ravigneaux planetary gear set is connected with the output shaft 19, the first brake 20 and the second brake 21; the first brake 20, the second brake 21 and the single planetary gear set are all fixed on the housing 22; the single planetary gear set comprises a first sun gear 6, a first planetary gear 7, a first planetary carrier 8 and a first outer ring gear 9; the first sun gear 6 and the first planetary carrier 8 are sleeved on the outer side of the input shaft 5, the first planetary carrier 8 is connected with the outer disc of the starting clutch 3, the inner hub of the second clutch 10 and the inner hub of the first clutch 11, the first planetary gear 7 is installed on the first planetary carrier 8, the first planetary gear 7 is meshed with the first sun gear 6 and the first outer ring gear 9, and the first outer ring gear 9 is fixed on the housing 22; the first sun gear 6 is connected with the rotor of the generator 4; the Ravigneaux planetary gear set comprises a second sun gear 13, a third sun gear 14, a short planetary gear 15, a long planetary gear 16, a second outer ring gear 17 and a second planetary carrier 18; the second planetary carrier 18 is connected with the outer disc of the second clutch 10 and the first brake 20, the short planetary gear 15 and the long planetary gear 16 are installed on the second planetary carrier 18, the outer end of the long planetary gear 16 is meshed with the second outer ring gear 17, and the second outer ring gear 17 is connected with the output shaft 19; the inner end of the long planetary gear 16 is meshed with the short planetary gear 15 and the second sun gear 13, the second sun gear 13 is connected with the second brake 21, the short planetary gear 15 is meshed with the third sun gear 14, and the third sun gear 14 is connected with the rotor of the drive motor 12.

[0020] The output shaft 19 obtains power output from the Ravigneaux planetary gear set, the first brake 20 and the second brake 21 are used to brake the corresponding components to realize different gears or modes, S1 and S2 are related power transmission nodes, and the whole realizes various power transmission and mode switching through the meshing, constraint and other relationships of various components, so as to meet the requirements of different working conditions.

[0021] The application discloses a multi-gear hybrid power transmission system one-gear transmission method. S1: the generator 4 and the driving motor 12 are in a non-working state, the second clutch 10 and the second brake 21 are in a separated state, the starting clutch 3, the first clutch 11 and the first brake 20 are in a combined state, and the engine 1 and the hydraulic torque converter 2 are in a working state; the driving motor 12 and the generator 4 can participate in power generation or driving.

[0022] S2: the engine 1 is started, the engine 1 power is output to the input shaft 5 through the hydraulic torque converter 2, the input shaft 5 combines the starting clutch 3 and the first clutch 11, and the power is transmitted to the third sun gear 14, so that the third sun gear 14 rotates; S3: the third sun gear 14 rotates the long planetary gear 16 through the meshed short planetary gear 15, and in the one-gear state, the rotating speed of the long planetary gear 16 is very low, and the long planetary gear 16 rotates to generate a reverse rotating torque on the second planetary carrier 18; S4: the long planetary gear 16 rotates the second outer gear ring 17 meshed with the long planetary gear 16, and the second outer gear ring 17 is fixed in connection with the first brake 20 in the combined state; S5: the second outer gear ring 17 outputs the power through the output shaft 19.

[0023] The application discloses a multi-gear hybrid power transmission system two-gear transmission method. S1: the generator 4 and the driving motor 12 are in a non-working state, the second clutch 10 and the first brake 20 are in a separated state, the starting clutch 3, the first clutch 11 and the second brake 21 are in a combined state, and the engine 1 and the hydraulic torque converter 2 are in a working state; the driving motor 12 and the generator 4 can participate in power generation or driving.

[0024] S2: the engine 1 is started, the engine 1 power is output to the input shaft 5 through the hydraulic torque converter 2, the input shaft 5 combines the starting clutch 3 and the first clutch 11, and the power is transmitted to the third sun gear 14, so that the third sun gear 14 rotates; S3: the third sun gear 14 rotates the long planetary gear 16 through the meshed short planetary gear 15, and in the one-gear state, the rotating speed of the long planetary gear 16 is very low, and the long planetary gear 16 rotates to generate a reverse rotating torque on the second planetary carrier 18; S4: the long planetary gear 16 rotates the second outer gear ring 17 meshed with the long planetary gear 16, and the second outer gear ring 17 is fixed in connection with the first brake 20 in the combined state; S5: the second outer gear ring 17 outputs the power through the output shaft 19.

[0025] The application discloses a multi-gear hybrid power transmission system three-gear transmission method. S1: make the generator 4 and the drive motor 12 in a non-working state, make the first brake 20 and the second brake 21 in a separated state, make the starting clutch 3, the second clutch 10 and the first clutch 11 in a combined state, make the engine 1 and the hydraulic torque converter 2 in a working state; the drive motor 12 and the generator 4 can participate in power generation or driving.

[0026] S2: start the engine 1, the power of the engine 1 is output to the input shaft 5 through the hydraulic torque converter 2, the input shaft 5 combines the starting clutch 3, the second clutch 10 and the first clutch 11, and transmits power to the third sun gear 14 and the second planet carrier 18, so that the input shaft 5, the third sun gear 14 and the second planet carrier 18 are connected as a whole, and the three rotate with the input shaft 5 at the same speed; S3: the short planet gear 15 and the long planet gear 16 are constrained and cannot rotate, but can revolve with the third sun gear 14 and the second planet carrier 18, and the revolving short planet gear 15 and long planet gear 16 drive the second outer ring gear 17 to rotate; S4: the second outer ring gear 17 outputs power through the output shaft 19.

[0027] The four-gear transmission method of the multi-gear hybrid power transmission system of the application comprises the following steps: S1: make the generator 4 and the drive motor 12 in a non-working state, make the first clutch 11 and the first brake 20 in a separated state, make the starting clutch 3, the second clutch 10 and the second brake 21 in a combined state, make the engine 1 and the hydraulic torque converter 2 in a working state; the drive motor 12 and the generator 4 can participate in power generation or driving.

[0028] S2: start the engine 1, the power of the engine 1 is output to the input shaft 5 through the hydraulic torque converter 2, the input shaft 5 combines the starting clutch 3 and the second clutch 10, and transmits power to the second planet carrier 18, so that the second planet carrier 18 rotates; S3: the second planet carrier 18 rotates, drives the long planet gear 16 and the short planet gear 15 to rotate, because the second brake 21 is in a working state, the second sun gear 13 is fixed, the long planet gear 16 and the short planet gear 15 rotate around the second sun gear 13 while rotating, and further drive the second outer ring gear 17 to rotate; S4: the second outer ring gear 17 outputs power through the output shaft 19.

[0029] The three-power-source driving mode gear transmission method of the multi-gear hybrid power transmission system of the application is mainly applied to starting or low-speed high-torque working conditions. The method comprises the following steps: S1: make the second clutch 10 and the second actuator 21 in the disengaged state, make the starting clutch 3, the first clutch 11 and the first brake 20 in the engaged state, make the engine 1, the generator 4 and the drive motor 12 in the working state; make the hydraulic torque converter 2 in the non-direct working condition, work through the pump and turbine direct sliding abrasion state, decouple the engine and the vehicle speed, solve the working condition that the engine cannot work below the working speed.

[0030] S2: start the engine 1, the engine 1 power is output to the input shaft 5 through the hydraulic torque converter 2, and is coupled to the single planetary gear through the starting clutch 3; the generator 4 power is transmitted to the first clutch 11 through the single planetary gear; the input shaft 5 is combined with the starting clutch 3 and the first clutch 11, and the output power of the drive motor 12 is combined; S3: the power combined by the generator 4 and the drive motor 12 is transmitted to the third sun gear 14, the third sun gear 14 drives the long planetary gear 16 to rotate through the meshing short planetary gear 15, and the long planetary gear 16 rotates to generate a reverse rotating torque on the second planet carrier 18 in the first gear position; S4: the long planetary gear 16 drives the second outer ring gear 17 meshing with it to rotate because the second planet carrier 18 is connected with the first brake 20 in the engaged state and is fixed; S5: the second outer ring gear 17 outputs power through the output shaft 19.

[0031] The EV1 gear transmission method of the multi-gear hybrid power transmission system of the application comprises the following steps: S1: make the engine 1, the hydraulic torque converter 2 and the generator 4 in the non-working state, make the starting clutch 3, the second clutch 10, the first clutch 11 and the second brake 21 in the disengaged state, make the first brake 20 in the engaged state, and make the drive motor 12 in the working state; S2: the drive motor 12 outputs power and transmits the power to the third sun gear 14 to make the third sun gear 14 rotate; S3: the third sun gear 14 drives the long planetary gear 16 to rotate through the meshing short planetary gear 15, the second planet carrier 18 is fixed to prevent reverse rotation because the first brake 20 is in the working state, and the long planetary gear 16 drives the second outer ring gear 17 to rotate under constraint; S4: the second outer ring gear 17 outputs power through the output shaft 19.

[0032] The EV2 gear transmission method of the multi-gear hybrid power transmission system of the application comprises the following steps: S1: make engine 1, hydraulic torque converter 2 and generator 4 are in non-working state, make starting clutch 3, second clutch 10, first clutch 11 and first brake 20 are in the separated state, make the second brake 21 is in the combined state, make the drive motor 12 is in working state; S2: drive motor 12 outputs power, and power is transmitted to third sun gear 14, and third sun gear 14 rotates; S3: third sun gear 14 drives long planetary gear 16 to rotate through meshing short planetary gear 15, and long planetary gear 16 rotates synchronously in revolution due to the working state of second brake 21, and second sun gear 13 is fixed; S4: long planetary gear 16 drives second outer gear 17 to rotate through compound motion; S5: second outer gear 17 outputs power through output shaft 19.

[0033] A double-motor EV1 gear transmission method of a multi-gear hybrid power transmission system, the method comprises the following steps: S1: make engine 1 and hydraulic torque converter 2 are in non-working state, make starting clutch 3, second clutch 10 and second brake 21 are in the separated state, make first clutch 11 and first brake 20 are in the combined state, make generator 4 and drive motor 12 are in working state; S2: start engine 1, and power of engine 1 is transmitted to first clutch 11 through single planetary gear train, and power is transmitted to drive motor 12 through first clutch 11, and power output by drive motor 12 is combined with power transmitted by generator 4, and then the combined power is transmitted to third sun gear 14, so that third sun gear 14 rotates; S3: third sun gear 14 drives long planetary gear 16 to rotate through meshing short planetary gear 15, and long planetary gear 16 drives second outer gear 17 to rotate under constraint due to the working state of first brake 20, and second planetary carrier 18 is fixed to prevent reverse rotation; S4: second outer gear 17 outputs power through output shaft 19.

[0034] A double-motor EV2 gear transmission method of a multi-gear hybrid power transmission system, the method comprises the following steps: S1: make engine 1 and hydraulic torque converter 2 are in non-working state, make starting clutch 3, second clutch 10 and first brake 20 are in the separated state, make first clutch 11 and second brake 21 are in the combined state, make generator 4 and drive motor 12 are in working state; S2: start the engine 1, the engine 1 power is transmitted to the first clutch 11 through the single planetary row, the power is transmitted to the driving motor 12 through the first clutch 11, the power output by the driving motor 12 is combined with the power transmitted by the generator 4, and the combined power is transmitted to the third sun gear 14, so that the third sun gear 14 rotates; S3: the third sun gear 14 drives the long planetary gear 16 to rotate through the meshing short planetary gear 15; because the second brake 21 is in the working state, the second sun gear 13 is fixed, and the long planetary gear 16 rotates synchronously while rotating; S4: the long planetary gear 16 drives the second outer gear 17 to rotate through the compound motion of rotation and revolution; S5: the second outer gear 17 outputs power through the output shaft 19.

[0035] The application discloses a multi-gear hybrid power transmission system ECVT gear transmission method. S1: the first clutch 11, the first brake 20 and the second brake 21 are in the separated state, the starting clutch 3 and the second clutch 10 are in the combined state, and the engine 1 and the driving motor 12 are in the working state; S2: power distribution and transmission under different working conditions: S201: low-speed running working condition: the engine 1 power is transmitted to the input shaft 5 through the hydraulic torque converter 2, and is coupled to the single planetary row through the starting clutch 3 and is transmitted to the generator 4, so that energy recovery is realized; the driving motor 12 is used as a power source and the power is derived from a battery or the input shaft 5, the power is transmitted to the third sun gear 14, the short planetary gear 15 and the long planetary gear 16 rotate with the third sun gear 14, the second outer gear 17 is driven to rotate, and the power is output through the output shaft 19; S202: normal running working condition: one part of the engine 1 power is transmitted to the generator 4 through the input shaft 5 to supply power or store energy as required; the other part is transmitted to the second planetary carrier 18 through the input shaft 5 and the second clutch 10, the second planetary carrier 18 rotates, drives the long planetary gear 16 and the short planetary gear 15 to rotate, and then drives the second outer gear 17 to rotate, and the power is output through the output shaft 19; S203: full-speed running / accelerating working condition: the engine 1 outputs full power, the driving motor 12 supplements power, and the power is derived from a battery or an input shaft 5; the two cooperate to provide the power required for acceleration to drive the second outer gear 17 to rotate, and the power is output through the output shaft 19.

[0036] Through speed regulation of the driving motor 12 and the engine 1, the planetary gear mechanism Ravigneaux train realizes continuous variable transmission ratio between the engine and the wheels, and matches efficient power matching under different working conditions.

[0037] It will be obvious to a person skilled in the art that the application is not limited to the details of the foregoing exemplary embodiments and can be implemented in other forms without departing from the spirit or essential characteristics of the application. The embodiments are considered in all respects to be illustrative and not restrictive, the scope of the application being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalents of the claims are therefore intended to be embraced therein. No reference signs in the claims should be considered as limiting the scope of the claims to the features to which the reference signs are attached.

[0038] Furthermore, it should be understood that although the description is made on the basis of the embodiments, not every embodiment contains only one independent technical solution, and the description of the specification is only for the sake of clarity, and those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that those skilled in the art can understand.

Claims

1. A multi-speed hybrid power transmission system, characterized by: The invention comprises an engine (1), a torque converter (2), a starting clutch (3), a generator (4), an input shaft (5), a second clutch (10), a first clutch (11), a drive motor (12), an output shaft (19), a first brake (20), a second brake (21), a single planetary gear and a Ravenna planetary gear train; the output end of the engine (1) is connected to the input end of the torque converter (2), the output end of the torque converter (2) is connected to the input end of the input shaft (5), the output end of the input shaft (5) is connected to the inner hub of the starting clutch (3), the outer disk of the starting clutch (3) is connected to the single planetary gear, the single planetary gear is connected to the inner hub of the second clutch (10), The inner hub of the first clutch (11) is connected to the generator (4), the outer disk of the second clutch (10) is connected to the Ravenna planetary gear train, the outer disk of the first clutch (11) is connected to the rotor of the drive motor (12), and the rotor of the drive motor (12) is connected to the Ravenna planetary gear train; the Ravenna planetary gear train is connected to the output shaft (19), the first brake (20) and the second brake (21); the first brake (20), the second brake (21) and the single planetary gear are all fixed on the housing (22); the single planetary gear includes a first sun gear (6), a first planetary gear (7), a first planetary carrier (8) and a first outer ring gear (9); the outer sleeve of the input shaft (5) A first sun gear (6) and a first planetary carrier (8) are provided, the first planetary carrier (8) is connected to the outer plate of the starting clutch (3), the inner hub of the second clutch (10) and the inner hub of the first clutch (11), a first planetary gear (7) is installed on the first planetary carrier (8), the first planetary gear (7) is meshed with the first sun gear (6) and the first outer ring gear (9), the first outer ring gear (9) is fixed on the housing (22); the first sun gear (6) is connected to the rotor of the generator (4); the Ravenna planetary gear system includes a second sun gear (13), a third sun gear (14), a short planetary gear (15), a long planetary gear (16), a second outer ring gear (17) and a second planetary carrier (18); the second planetary carrier (18) is connected to the outer plate of the second clutch (10) and the first brake (20); a short planetary gear (15) and a long planetary gear (16) are mounted on the second planetary carrier (18); the outer end of the long planetary gear (16) is meshed and connected to the second outer ring gear (17); the second outer ring gear (17) is connected to the output shaft (19); the inner end of the long planetary gear (16) is meshed and connected to the short planetary gear (15) and the second sun gear (13); the second sun gear (13) is connected to the second brake (21); the short planetary gear (15) is meshed and connected to the third sun gear (14); and the third sun gear (14) is connected to the rotor of the drive motor (12).

2. A first gear transmission method for a multi-gear hybrid power transmission system according to claim 1, characterized in that: The method comprises the following steps: S1: The generator (4) and the drive motor (12) are placed in a non-operating state, the second clutch (10) and the second brake (21) are placed in a disengaged state, the starting clutch (3), the first clutch (11) and the first brake (20) are placed in a coupled state, and the engine (1) and the torque converter (2) are placed in an operating state; S2: The engine (1) is started, and the power of the engine (1) is output to the input shaft (5) through the torque converter (2). The input shaft (5) is combined with the starting clutch (3) and the first clutch (11) to transmit the power to the third sun gear (14), causing the third sun gear (14) to rotate; S3: The third sun gear (14) drives the long planet gear (16) to rotate through the meshed short planet gear (15), and the rotation of the long planet gear (16) generates a torque in the opposite direction on the second planet carrier (18); S4: Since the second planet carrier (18) is connected and fixed to the first brake (20) in the engaged state, the long planet gear (16) drives the second outer ring gear (17) meshed with the long planet gear (16) to rotate; S5: The second outer ring gear (17) outputs the power through the output shaft (19).

3. A second-gear transmission method for a multi-gear hybrid power transmission system according to claim 1, characterized in that: The method comprises the following steps: S1: The generator (4) and the drive motor (12) are placed in a non-operating state, the second clutch (10) and the first brake (20) are placed in a disengaged state, the starting clutch (3), the first clutch (11) and the second brake (21) are placed in a coupled state, and the engine (1) and the torque converter (2) are placed in an operating state; S2: The engine (1) is started, and the power of the engine (1) is output to the input shaft (5) through the torque converter (2). The input shaft (5) is combined with the starting clutch (3) and the first clutch (11) to transmit the power to the third sun gear (14), causing the third sun gear (14) to rotate; S3: The third sun gear (14) drives the long planet gear (16) to rotate through the meshed short planet gear (15). At the same time, because the second brake (21) is combined with the fixed second sun gear (13), the long planet gear (16) rotates synchronously with the long planet gear (16). S4: The long planetary gear (16) drives the second outer gear ring (17) meshing with it to rotate through the combined motion of revolution and rotation; S5: The second outer ring gear (17) outputs the power through the output shaft (19).

4. A three-gear transmission method for a multi-gear hybrid power transmission system according to claim 1, characterized in that: The method comprises the following steps: S1: The generator (4) and the drive motor (12) are placed in a non-operating state, the first brake (20) and the second brake (21) are placed in a disengaged state, the starting clutch (3), the second clutch (10) and the first clutch (11) are placed in a coupled state, and the engine (1) and the torque converter (2) are placed in an operating state; S2: The engine (1) is started, and the power of the engine (1) is output to the input shaft (5) through the torque converter (2). The input shaft (5) is combined with the starting clutch (3), the second clutch (10) and the first clutch (11) to transmit the power to the third sun gear (14) and the second planetary carrier (18); S3: The short planetary gear (15) and the long planetary gear (16) are constrained and cannot rotate on their own. They can only revolve together with the third sun gear (14) and the second planet carrier (18). The revolving short planetary gear (15) and the long planetary gear (16) drive the second outer ring gear (17) to rotate together; S4: The second outer ring gear (17) outputs the power through the output shaft (19).

5. A four-gear transmission method for a multi-gear hybrid power transmission system according to claim 1, characterized in that: The method comprises the following steps: S1: The generator (4) and the drive motor (12) are placed in a non-operating state, the first clutch (11) and the first brake (20) are placed in a disengaged state, the starting clutch (3), the second clutch (10) and the second brake (21) are placed in a coupled state, and the engine (1) and the torque converter (2) are placed in an operating state; S2: The engine (1) is started, and the power of the engine (1) is output to the input shaft (5) through the torque converter (2). The input shaft (5) is combined with the starting clutch (3) and the second clutch (10) to transmit the power to the second planetary carrier (18), causing the second planetary carrier (18) to rotate; S3: The second planet carrier (18) rotates, driving the long planet gear (16) and the short planet gear (15) to rotate. Since the second brake (21) is in the working state, the second sun gear (13) is fixed. The long planet gear (16) and the short planet gear (15) rotate while revolving around the second sun gear (13), thereby driving the second outer ring gear (17) to rotate. S4: The second outer ring gear (17) outputs the power through the output shaft (19).

6. A gear transmission method in a three-power source driving mode of a multi-gear hybrid power transmission system according to claim 1, characterized in that: The method comprises the following steps: S1: The second clutch (10) and the second actuator (21) are in a disengaged state, the starting clutch (3), the first clutch (11) and the first brake (20) are in a coupled state, the engine (1), the generator (4) and the drive motor (12) are in a working state; and the torque converter (2) is in a non-direct working state; S2: The engine (1) is started, and the power of the engine (1) is output to the input shaft (5) through the torque converter (2), and is coupled to the single planetary gear set through the starting clutch (3); the power of the generator (4) is transmitted to the first clutch (11) through the single planetary gear set, and the input shaft (5) is combined with the starting clutch (3) and the first clutch (11) to merge with the output power of the drive motor (12); S3: The combined power of the generator (4) and the drive motor (12) is transmitted to the third sun gear (14). The third sun gear (14) drives the long planet gear (16) to rotate through the meshing short planet gear (15). The rotation of the long planet gear (16) generates a torque in the opposite direction on the second planet carrier (18); S4: Since the second planet carrier (18) is connected and fixed to the first brake (20) in the engaged state, the long planet gear (16) drives the second outer ring gear (17) meshed with the long planet gear (16) to rotate; S5: The second outer ring gear (17) outputs the power through the output shaft (19).

7. A multi-speed hybrid power transmission system EV1 gear transmission method according to claim 1, characterized in that: The method comprises the following steps: S1: The engine (1), the torque converter (2) and the generator (4) are placed in a non-operating state, the starting clutch (3), the second clutch (10), the first clutch (11) and the second brake (21) are placed in a disengaged state, the first brake (20) is placed in a coupled state, and the drive motor (12) is placed in an operating state; S2: The driving motor (12) outputs power and transmits the power to the third sun gear (14), causing the third sun gear (14) to rotate; S3: The third sun gear (14) drives the long planet gear (16) to rotate through the meshing short planet gear (15), and the long planet gear (16) drives the second outer ring gear (17) to rotate under the constraint; S4: The second outer ring gear (17) outputs the power through the output shaft (19).

8. A multi-speed hybrid power transmission system EV2 gear transmission method according to claim 1, characterized in that: The method comprises the following steps: S1: The engine (1), the torque converter (2) and the generator (4) are placed in a non-operating state, the starting clutch (3), the second clutch (10), the first clutch (11) and the first brake (20) are placed in a disengaged state, the second brake (21) is placed in a coupled state, and the drive motor (12) is placed in an operating state; S2: The driving motor (12) outputs power and transmits the power to the third sun gear (14), causing the third sun gear (14) to rotate; S3: The third sun gear (14) drives the long planet gear (16) to rotate through the meshed short planet gear (15). Since the second brake (21) is in the working state, the second sun gear (13) is fixed, and the long planet gear (16) rotates on its own and revolves synchronously; S4: The long planet gear (16) drives the second outer ring gear (17) to rotate through compound motion; S5: The second outer ring gear (17) outputs the power through the output shaft (19).

9. A method for driving a dual-motor EV in 1st gear in a multi-gear hybrid powertrain system according to claim 1, characterized in that: The method comprises the following steps: S1: The engine (1) and the torque converter (2) are placed in a non-operating state, the starting clutch (3), the second clutch (10) and the second brake (21) are placed in a disengaged state, the first clutch (11) and the first brake (20) are placed in a coupled state, and the generator (4) and the drive motor (12) are placed in an operating state; S2: The engine (1) is started, and the power of the engine (1) is transmitted to the first clutch (11) through the single planetary gear, and the power is transmitted to the drive motor (12) through the first clutch (11). The power output by the drive motor (12) is combined with the power transmitted by the generator (4), and then transmitted to the third sun gear (14), so that the third sun gear (14) rotates; S3: The third sun gear (14) drives the long planet gear (16) to rotate through the meshing short planet gear (15), and the long planet gear (16) drives the second outer ring gear (17) to rotate under the constraint; S4: The second outer ring gear (17) outputs the power through the output shaft (19).

10. A multi-speed hybrid power transmission system ECVT transmission method according to claim 1, characterized in that: The method comprises the following steps: S1: The first clutch (11), the first brake (20) and the second brake (21) are in a disengaged state, the starting clutch (3) and the second clutch (10) are in a coupled state, and the engine (1) and the drive motor (12) are in a working state; S2: Power distribution and transmission under different working conditions: S201: Low-speed driving condition: The power of the engine (1) is transmitted to the input shaft (5) through the torque converter (2), and is coupled to the single planetary gear through the starting clutch (3) and transmitted to the generator (4) to achieve energy recovery; the drive motor (12) serves as the power source and transmits the power to the third sun gear (14), the short planetary gear (15) and the long planetary gear (16) rotate along with the third sun gear (14), driving the second outer ring gear (17) to rotate, and outputting the power through the output shaft (19); S202: Normal driving condition: a portion of the power of the engine (1) is transmitted to the generator (4) via the input shaft (5); the other portion is transmitted to the second planetary carrier (18) via the input shaft (5) and the second clutch (10). The second planetary carrier (18) rotates, driving the long planetary gear (16) and the short planetary gear (15) to rotate, and further driving the second outer ring gear (17) to rotate, and outputting the power via the output shaft (19); S203: Full speed running / acceleration condition: The engine (1) outputs full power, and the drive motor (12) adds power. The two work together to provide the power required for acceleration, driving the second outer gear ring (17) to rotate and output the power through the output shaft (19).

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