CN110857027A - Hybrid power drive system - Google Patents

Abstract

A hybrid drive system includes an engine, a first motor, a second motor, a planetary gear device, a clutch gear device and a switch device. The engine and the first motor are both connected to the planetary gear device, and the clutch gear device is arranged between the engine and the first motor. between the motors; the planetary gear device includes a first rotating element, a second rotating element and a third rotating element, the first rotating element has a rotating axle, and the first motor is connected with the rotating axle; the clutch gear device includes a first clutch and a second clutch , the first clutch connects the engine and the rotating axle, the second clutch connects the first rotating element and the third rotating element; the second motor is arranged in parallel with the first motor, and the second motor is connected to the output end. The hybrid drive system of the present invention has multiple working modes and is well platformed.

Description

Hybrid drive system

technical field

The invention relates to the technical field of new energy, in particular to a hybrid drive system.

Background technique

At present, there are two main types of transmissions on the market: stepped transmissions and continuously variable transmissions. Stepped transmissions are subdivided into manual and automatic. Most of them provide a limited number of discrete output to input speed ratios through different meshing arrangements of gear trains or planetary gear trains. The adjustment of the drive wheel speed between two adjacent speed ratios is achieved by the speed change of the internal combustion engine. Continuously variable transmission, whether it is mechanical, hydraulic, or mechanical or electrical, can provide an infinite number of continuously selectable speed ratios within a certain speed range. In theory, the speed change of the driving wheel can be completely completed by the transmission. . In this way, the internal combustion engine can work within the optimal speed range as much as possible. At the same time, compared with the stepped transmission, the continuously variable transmission has many advantages such as stable speed regulation and can make full use of the maximum power of the internal combustion engine. Therefore, the continuously variable transmission has been the research object of engineers from all over the world for many years.

In recent years, the birth of electric motor hybrid technology has opened up a new way to realize the complete matching of power between the internal combustion engine and the power wheel. Among the numerous powertrain design schemes, the most representative ones are the series hybrid system and the parallel hybrid system. In the motor series hybrid system, the internal combustion engine, generator, electric motor, shaft system and driving wheel form a series power chain, and the powertrain structure is extremely simple. Among them, the combination of generator and motor can be regarded as a transmission in the traditional sense. When used in combination with energy storage, such as batteries, capacitors, etc., the transmission can also be used as an energy regulating device to complete the independent regulation of speed and torque.

The motor parallel system has two parallel independent power chains. One consists of a traditional mechanical transmission, and the other consists of a motor and battery system. The mechanical transmission is responsible for completing the adjustment of speed, while the electric motor and battery system complete the adjustment of power or torque. To realize the full potential of the entire system, the mechanical transmission also needs to be continuously variable.

The advantages of the series hybrid system lie in its simple structure and flexible layout. However, all the power passes through the generator and the motor, so the power requirement of the motor is high, the volume is large, and the weight is heavy. At the same time, since the energy transmission process undergoes two electromechanical and motor conversions, the efficiency of the entire system is low. In a parallel hybrid system, only part of the power passes through the motor system, so the power requirements for the motor are relatively low, and the overall system efficiency is high. However, this system requires two independent subsystems, which is expensive. Usually only used in weakly mixed systems.

SUMMARY OF THE INVENTION

In view of this, the present invention provides a hybrid drive system with multiple working modes and good platformization.

A hybrid drive system includes an engine, a first motor, a second motor, a planetary gear device, a clutch gear device and a switch device, the engine and the first motor are both connected to the planetary gear device, and the clutch gear device is arranged between the engine and the first motor. between the motors; the planetary gear device includes a first rotating element, a second rotating element and a third rotating element, the first rotating element has a rotating axle, and the first motor is connected with the rotating axle; the clutch gear device includes a first clutch and a second clutch , the first clutch connects the engine and the rotating axle, the second clutch connects the first rotating element and the third rotating element; the second motor is arranged in parallel with the first motor, and the second motor is connected to the output end.

In an embodiment of the present invention, the above-mentioned second clutch includes a driving part and a driven part, the driving part is connected to the rotating axle, and the driven part is connected to the third rotating element; or, the driven part The moving part is connected to the rotating axle, and the active part is connected to the third rotating element.

In an embodiment of the present invention, the first rotating element is a sun gear, the second rotating element is a planet carrier, the third rotating element is a ring gear, and the switching device is a brake or a one-way clutch;

The first motor has a first motor output shaft, the first motor output shaft is provided with a first gear, the rotating wheel shaft is provided with a second gear, and the first gear and the second gear are meshed with each other ;

The engine and the rotating axle are engaged when the first clutch operates; the sun gear and the ring gear are locked when the second clutch operates;

the brake or one-way clutch brakes or unlocks the ring gear;

The hybrid drive system further includes an intermediate shaft, and a third gear is arranged on the intermediate shaft, and the third gear is in mesh with the planet carrier;

The second motor has a second motor output shaft, the second motor output shaft is provided with a fourth gear, and the fourth gear and the third gear are in mesh with each other.

In an embodiment of the present invention, the above-mentioned hybrid drive system further includes a differential gear, the differential gear is provided with a differential gear, and the intermediate shaft is further provided with a fifth gear, the fifth gear and The differential gears mesh with each other.

In the embodiment of the present invention, the above-mentioned hybrid drive system has a single-motor pure electric mode, a dual-motor pure electric first-gear mode, a dual-motor pure electric second-gear mode, a range extension mode, a first-gear mode driven by the engine alone, and a single-drive mode of the engine. 2nd gear mode, 1st stage hybrid mode, 2nd stage hybrid mode and park power generation mode.

In the embodiment of the present invention, in the pure electric mode of the single motor, the first clutch, the second clutch, the brake or the one-way clutch, the engine and the first motor do not work , the second motor drives; in the dual-motor pure electric first gear mode, the engine, the first clutch and the second clutch do not work, the brake or the one-way clutch works, the A brake or a one-way clutch brakes the ring gear, and both the first motor and the second motor are driven; in the dual-motor pure electric second-gear mode, the engine and the first clutch do not work , the brake or the one-way clutch does not work, the second clutch works, the second clutch locks the sun gear and the ring gear, and both the first motor and the second motor are driven.

In an embodiment of the present invention, in the extended range mode, the first clutch is activated, the first clutch engages the engine and the rotating axle, the second clutch is deactivated, and the brake or The one-way clutch does not work, the engine drives the first motor to generate electricity, the first motor provides electrical energy for the second motor, and the second motor drives.

In an embodiment of the present invention, in the first gear mode of the engine alone, the first clutch is activated, the brake or the one-way clutch is activated, and the first clutch engages the engine and the rotating axle, The brake or the one-way clutch brakes the ring gear, the second clutch, the first motor and the second motor do not work, and the engine drives; in the second-gear mode of the engine alone driving down, the first clutch and the second clutch operate, the first clutch engages the engine and the rotating axle, the second clutch locks the sun gear and the ring gear, the first clutch The electric motor, the second electric motor, and the brake or one-way clutch do not operate, and the engine drives.

In an embodiment of the present invention, in the one-stage hybrid mode, the first clutch is operated, the brake or the one-way clutch is operated, the first clutch engages the engine and the rotating axle, and thus The brake or the one-way clutch brakes the ring gear, the second clutch does not work, and the engine, the first motor and the second motor are driven; in the two-stage hybrid mode, all The first clutch and the second clutch operate, the first clutch engages the engine and the rotating axle, the second clutch locks the sun gear and the ring gear, the brake or the one-way clutch When not in operation, the engine, the first motor and the second motor are all driven.

In an embodiment of the present invention, in the parking power generation mode, the first clutch operates, the first clutch engages the engine and the rotating axle, the second clutch and the brake or a single When the clutch is not operated, the power of the engine is transmitted to the first electric motor to generate electricity.

In an embodiment of the present invention, the first rotating element is a sun gear, the second rotating element is one of the ring gear and the planet carrier, the third rotating element is the other of the ring gear and the planet carrier, and the switch The device is a brake or a one-way clutch.

In an embodiment of the present invention, the first rotating element is a planet carrier, the second rotating element is one of the sun gear and the ring gear, the third rotating element is the other of the sun gear and the ring gear, and the switch The device is a brake or a one-way clutch.

The engine and the first motor of the hybrid drive system of the present invention are both connected to the planetary gear device, and the clutch gear device is arranged between the engine and the first motor; the planetary gear device includes a first rotating element, a second rotating element and a third rotating element, the first rotating element has a rotating axle, and the first motor is connected with the rotating axle; the clutch gear device includes a first clutch and a second clutch, the first clutch is connected with the engine and the rotating axle, and the second clutch is connected with the first a rotating element and a third rotating element; the switching device locks or unlocks the third rotating element; the second motor is arranged in parallel with the first motor, and the second motor is connected to the output end. The hybrid drive system of the present invention can operate in a single-motor pure electric mode, a dual-motor pure electric first-gear mode, a dual-motor pure electric second-gear mode, a range extension mode, an engine-driven first-gear mode, an engine-driven second-gear mode, a It works in the first-level hybrid mode, the second-level hybrid mode and the parking power generation mode, which has strong flexibility. The hybrid drive system of the present invention can cover HEV models and PHEV models, and is well platformed.

Description of drawings

FIG. 1 is a schematic structural diagram of a hybrid drive system according to a first embodiment of the present invention.

FIG. 2 is a schematic diagram of power transmission of the hybrid drive system according to the first embodiment of the present invention in a single-motor pure electric mode.

3 is a schematic diagram of power transmission of the hybrid drive system according to the first embodiment of the present invention in a dual-motor pure electric first-gear mode.

4 is a schematic diagram of power transmission of the hybrid drive system according to the first embodiment of the present invention in a dual-motor pure electric second-gear mode.

FIG. 5 is a schematic diagram of power transmission of the hybrid drive system according to the first embodiment of the present invention in an extended-range mode.

6 is a schematic diagram of power transmission of the hybrid drive system according to the first embodiment of the present invention when the engine alone drives the first gear.

FIG. 7 is a schematic diagram of power transmission of the hybrid drive system according to the first embodiment of the present invention when the engine alone drives the second gear mode.

FIG. 8 is a schematic diagram of power transmission of the hybrid drive system according to the first embodiment of the present invention in a first-stage hybrid mode.

FIG. 9 is a schematic diagram of power transmission of the hybrid drive system according to the first embodiment of the present invention in a two-stage hybrid mode.

10 is a schematic diagram of power transmission of the hybrid drive system in the parking power generation mode according to the first embodiment of the present invention.

11 is a schematic structural diagram of a hybrid drive system according to a second embodiment of the present invention.

FIG. 12 is a schematic structural diagram of a hybrid drive system according to a third embodiment of the present invention.

Detailed ways

In order to make the objectives, technical solutions and advantages of the present invention clearer, the embodiments of the present invention will be further described below with reference to the accompanying drawings.

first embodiment

FIG. 1 is a schematic structural diagram of a hybrid drive system according to a first embodiment of the present invention. As shown in FIG. 1 , the hybrid drive system 10 includes an engine 11, a planetary gear device, a first motor 13, a clutch gear device, a switch device, an intermediate shaft 16, a second motor 17, a differential 18 and a power battery (not shown in the figure). Show).

The engine 11 is, for example, a gasoline engine or a diesel engine.

The planetary gear device includes a first rotation element, a second rotation element, and a third rotation element. The first rotating element has a rotating axle 122 , the rotating axle 122 and the first rotating element can rotate synchronously, and the rotating axle 122 is connected with the first motor 13 . In this embodiment, the first rotation element is, for example, the sun gear 121 , the second rotation element is, for example, the planet carrier 124 , and the third rotation element is, for example, the ring gear 126 . The planet carrier 124 is provided with a planetary gear 125, the planetary gear 125 is connected to the planetary carrier 124 through rolling or sliding bearings, the sun gear 121 is arranged in the ring gear 126, and the sun gear 121 meshes with the planetary gear 125 and the ring gear 126 respectively.

The first motor 13 has a first motor output shaft 131 , the first motor output shaft 131 is provided with a first gear 132 , the rotating wheel shaft 122 is provided with a second gear 123 , and the first gear 132 and the second gear 123 are meshed with each other. In this embodiment, the first motor 13 is an integrated drive and generator.

The clutch gear arrangement includes a first clutch 141 and a second clutch 142 . The second clutch 142 includes a driving part 142a connected to the rotating axle 122 and a driven part 142b connected to the third rotating element (the ring gear 126). In this embodiment, the first clutch 141 engages the engine 11 and the rotating axle 122. For example, when the first clutch 141 works, the first clutch 141 engages the engine 11 and the rotating axle 122; The clutch 141 separates the engine 11 from the rotating axle 122 . The second clutch 142 locks the first rotating element (sun gear 121 ) and the third rotating element (ring gear 126 ), for example, when the second clutch 142 works, the second clutch 142 locks the sun gear 121 and the ring gear 126 , that is, the second The driving part 142a of the clutch 142 is combined with the driven part 142b; when the second clutch 142 does not work, the second clutch 142 separates the sun gear 121 from the ring gear 126, that is, the driving part 142a and the driven part 142b of the second clutch 142 disconnect.

The switch device is used to lock or unlock the ring gear 126 (third rotational element). In this embodiment, the switch device is, for example, a brake 151 or a one-way clutch, and the brake 151 or the one-way clutch is used to brake or unlock the ring gear 126 . In this embodiment, when the brake 151 or the one-way clutch works, the brake 151 or the one-way clutch brakes the ring gear 126; when the brake 151 or the one-way clutch does not work, the brake 151 or the one-way clutch unlocks the ring gear 126.

The intermediate shaft 16 is provided with a third gear 161 and a fifth gear 162 , the third gear 161 and the fifth gear 162 are spaced apart from each other, and the third gear 161 and the planet carrier 124 are meshed with each other.

The second motor 17 is arranged in parallel with the first motor 13, and the second motor 17 is connected to the output terminal. Specifically, the second motor 17 has a second motor output shaft 171 , the second motor output shaft 171 is provided with a fourth gear 172 , and the fourth gear 172 and the third gear 161 are meshed with each other. In this embodiment, the second motor 17 is an integrated drive and generator.

The differential gear 181 is provided with a differential gear 181, and the differential gear 181 and the fifth gear 162 mesh with each other. In this embodiment, the differential 18 is used to adjust the speed difference between the left and right wheels. When the car turns or drives on uneven roads, the left and right wheels roll at different speeds to ensure pure rolling motion of the driving wheels on both sides.

The power battery is electrically connected to the first motor 13 and the second motor 17 respectively. The power battery provides power for driving the first motor 13 and the second motor 17, and the power generated by the rotation of the first motor 13 and the second motor 17 can be stored in the power battery. In this embodiment, the engine 11 drives the first motor 13 to rotate through the planet carrier 124 and the sun gear 121 to generate electrical energy, which can be stored in the power battery; when the vehicle brakes, the power is passed from the wheel end through the differential 18, The differential gear 181, the fifth gear 162, the third gear 161, and the fourth gear 172 are then transmitted to the second motor 17 to drive the second motor 17 to rotate to generate electrical energy, which can be stored in the power battery; when parking , the power of the engine 11 is transmitted to the first motor 13 through the sun gear 121, and the first motor 13 is rotated to generate electric energy.

The hybrid drive system 10 of the present invention has a single-motor pure electric mode, a dual-motor pure electric first-gear mode, a dual-motor pure electric second-gear mode, a range extension mode, an engine-driven first-gear mode, an engine-driven second-gear mode, a Primary Hybrid Mode, Secondary Hybrid Mode and Parking Power Generation Mode.

FIG. 2 is a schematic diagram of power transmission of the hybrid drive system according to the first embodiment of the present invention in a single-motor pure electric mode. As shown in FIG. 2 , the direction of power transmission is shown in the direction of the arrow in the figure. In the single-motor pure electric mode, the first clutch 141 and the second clutch 142 do not work, the brake 151 or the one-way clutch does not work, and the engine 11 and the second clutch do not work. One motor 13 does not work, and the second motor 17 is driven. In this embodiment, the power transmission has a path, that is, the power is transmitted from the second motor 17 to the third gear 161 , the intermediate shaft 16 , the fifth gear 162 , the differential gear 181 , and the differential 18 through the fourth gear 172 , Finally to the end of the wheel. It is worth mentioning that when the vehicle is running at full speed, the hybrid drive system 10 can be driven in a single-motor pure electric mode.

3 is a schematic diagram of power transmission of the hybrid drive system according to the first embodiment of the present invention in a dual-motor pure electric first-gear mode. As shown in Figure 3, the power transmission direction is shown in the direction of the arrow in the figure, in the dual-motor pure electric first gear mode, the engine 11, the first clutch 141 and the second clutch 142 do not work, the brake 151 or the one-way clutch works, The brake 151 or the one-way clutch brakes the ring gear 126, and both the first motor 13 and the second motor 17 are driven. In this embodiment, the power transmission has two paths, among which path one, the first motor 13 is transmitted to the intermediate shaft 16 through the rotating wheel shaft 122 , the planetary gear 125 and the planetary carrier 124 , and then passes through the third gear 161 and the fifth gear 162 , differential gear 181, differential 18, and finally to the wheel end; path 2, the second motor 17 is transmitted to the third gear 161, the intermediate shaft 16, the fifth gear 162, and the differential gear 181 through the fourth gear 172 , differential 18, and finally to the wheel end. It is worth mentioning that, when the vehicle is running at a medium or low speed, the hybrid drive system 10 can be driven in a dual-motor pure electric first-gear mode.

4 is a schematic diagram of power transmission of the hybrid drive system according to the first embodiment of the present invention in a dual-motor pure electric second-gear mode. As shown in FIG. 4 , the power transmission direction is shown in the direction of the arrow in the figure. In the dual-motor pure electric second gear mode, the engine 11 and the first clutch 141 do not work, the brake 151 or the one-way clutch does not work, and the second clutch 142 Working, the second clutch 142 locks the sun gear 121 and the ring gear 126 (the sun gear 121 and the ring gear 126 are locked as a whole, the entire planetary gear device rotates as a whole, and its speed ratio is 1), the first motor 13 and the second motor 17 are driven. In this embodiment, the power transmission has two paths, wherein the first path is that the first motor 13 is transmitted to the intermediate shaft 16 through the entire planetary gear device, and then through the third gear 161 , the fifth gear 162 , the differential gear 181 , Differential 18, finally to the wheel end; path 2, the second motor 17 is transmitted to the third gear 161, the intermediate shaft 16, the fifth gear 162, the differential gear 181, the differential 18 through the fourth gear 172, and finally to the end of the wheel. It is worth mentioning that when the vehicle is running at a medium or high speed, the hybrid drive system 10 can be driven in a dual-motor pure electric second-gear mode.

FIG. 5 is a schematic diagram of power transmission of the hybrid drive system according to the first embodiment of the present invention in an extended-range mode. As shown in FIG. 5 , the power transmission direction is shown in the direction of the arrow in the figure. In the extended-range mode, the first clutch 141 works, the first clutch 141 engages the engine 11 and the rotating axle 122 , the second clutch 142 does not work, and the brake 151 Or the one-way clutch does not work, the engine 11 drives the first motor 13 to generate electricity, the first motor 13 provides electrical energy for the second motor 17 , and the second motor 17 drives. The engine 11 drives the first motor 13 via the rotating axle 122, the second gear 123, and the first gear 132, so that the first motor 13 rotates to generate electricity. The electric energy generated by the first motor 13 is stored in the power battery, and the power battery provides the second motor 17 Power for driving. In this embodiment, the power transmission has a path, which is transmitted from the second motor 17 to the third gear 161, the intermediate shaft 16, the fifth gear 162, the differential gear 181, the differential 18 through the fourth gear 172, and finally to the end of the wheel. It is worth mentioning that when the vehicle is running at full speed, the hybrid drive system 10 can be driven in the extended range mode.

6 is a schematic diagram of power transmission of the hybrid drive system according to the first embodiment of the present invention when the engine alone drives the first gear. As shown in FIG. 6 , the power transmission direction is shown in the direction of the arrow in the figure. In the first gear mode of the engine alone, the first clutch 141 works, the brake 151 or the one-way clutch works, and the first clutch 141 engages the engine 11 and the rotating axle. 122 , the brake 151 or the one-way clutch brakes the ring gear 126 , the second clutch 142 , the first motor 13 and the second motor 17 do not work, and the engine 11 drives. In this embodiment, the power transmission has a path, which is transmitted from the engine 11 to the intermediate shaft 16 through the first clutch 141, the rotating wheel shaft 122, the planetary gear 125, the planet carrier 124, and the third gear 161, and then passes through the fifth gear 162, Differential gear 181, differential 18, and finally to the wheel end. It is worth mentioning that, when the vehicle is running at a medium or low speed, the hybrid drive system 10 can be driven in a mode where the engine alone drives the first gear.

FIG. 7 is a schematic diagram of power transmission of the hybrid drive system according to the first embodiment of the present invention when the engine alone drives the second gear mode. As shown in FIG. 7 , the power transmission direction is shown in the direction of the arrow in the figure. In the second gear mode of the engine alone driving, the first clutch 141 and the second clutch 142 work, the first clutch 141 engages the engine 11 and the rotating axle 122, and the first clutch 141 is engaged with the rotating axle 122. The second clutch 142 locks the sun gear 121 and the ring gear 126 (the sun gear 121 and the ring gear 126 are locked as a whole, the entire planetary gear device rotates as a whole, and its speed ratio is 1), and the first motor 13 and the second motor 17 do not work , the brake 151 or the one-way clutch does not work, and the engine 11 drives. In this embodiment, the power transmission has a path, the engine 11 is transmitted to the intermediate shaft 16 through the entire planetary gear arrangement, then through the fifth gear 162, the differential gear 181, the differential 18, and finally to the wheel end. It is worth mentioning that when the vehicle is running at medium and high speed, the hybrid drive system 10 can be driven in the second gear mode of the engine alone.

FIG. 8 is a schematic diagram of power transmission of the hybrid drive system according to the first embodiment of the present invention in a first-stage hybrid mode. As shown in FIG. 8 , the power transmission direction is shown in the direction of the arrow in the figure. In the first-stage hybrid mode, the first clutch 141 works, the brake 151 or the one-way clutch works, and the first clutch 141 engages the engine 11 and the rotating axle 122 , the brake 151 or the one-way clutch brakes the ring gear 126, the second clutch 142 does not work, and the engine 11, the first motor 13 and the second motor 17 are driven. In this embodiment, the power transmission has three paths, among which path one, the engine 11 transmits to the intermediate shaft 16 through the rotating axle 122, the planetary gear 125, the planet carrier 124, and the third gear 161, and then passes through the fifth gear 162, the differential speed The first motor 13 is transmitted to the intermediate shaft 16 through the rotating wheel shaft 122, the planetary wheel 125 and the planetary carrier 124, and then passes through the third gear 161 and the fifth gear 162. , differential gear 181, differential 18, and finally to the wheel end; path three, the second motor 17 is transmitted to the third gear 161, the intermediate shaft 16, the fifth gear 162, and the differential gear 181 through the fourth gear 172 , differential 18, and finally to the wheel end. It is worth mentioning that, when the vehicle is running at a medium or low speed, the hybrid drive system 10 can be driven in a mode where the engine alone drives the first gear.

FIG. 9 is a schematic diagram of power transmission of the hybrid drive system according to the first embodiment of the present invention in a two-stage hybrid mode. As shown in FIG. 9 , the power transmission direction is shown in the direction of the arrow in the figure. In the two-stage hybrid mode, the first clutch 141 and the second clutch 142 work, the first clutch 141 engages the engine 11 and the rotating axle 122 , and the second clutch 141 The clutch 142 locks the sun gear 121 and the ring gear 126 (the sun gear 121 and the ring gear 126 are locked as a whole, the entire planetary gear device rotates as a whole, and its speed ratio is 1), the brake 151 or the one-way clutch does not work, the engine 11, Both the first motor 13 and the second motor 17 are driven. In this embodiment, the power transmission has three paths, among which path one, the engine 11 is transmitted to the intermediate shaft 16 through the entire planetary gear device, and then through the fifth gear 162, the differential gear 181, the differential 18, and finally to the wheel end; path two, the first motor 13 is transmitted to the intermediate shaft 16 through the entire planetary gear device, and then passes through the third gear 161, the fifth gear 162, the differential gear 181, the differential 18, and finally to the wheel end; path three , the second motor 17 is transmitted to the third gear 161, the intermediate shaft 16, the fifth gear 162, the differential gear 181, the differential 18 through the fourth gear 172, and finally to the wheel end. It is worth mentioning that when the vehicle is driving at a medium or high speed, the hybrid drive system 10 can be driven in the second gear mode of the engine alone.

10 is a schematic diagram of power transmission of the hybrid drive system in the parking power generation mode according to the first embodiment of the present invention. As shown in FIG. 10 , the power transmission direction is shown in the direction of the arrow in the figure. In the parking power generation mode, the first clutch 141 works, the first clutch 141 engages the engine 11 and the rotating axle 122 , the second clutch 142 does not work, and the brake 151 or the one-way clutch does not work, and the power of the engine 11 is transmitted to the first motor 13 to generate electricity.

The hybrid drive system 10 of the present invention has a single-motor pure electric mode, a dual-motor pure electric first-gear mode, a dual-motor pure electric second-gear mode, a range extension mode, an engine-driven first-gear mode, an engine-driven second-gear mode, a The first-level hybrid mode, the second-level hybrid mode and the parking power generation mode can automatically switch between different modes according to the SOC (remaining power) value of the power battery and the vehicle speed demand. For example, judging the magnitude relationship between the power battery SOC value and the first threshold, or simultaneously judging the magnitude relationship between the power battery SOC value and the first threshold, and the magnitude relationship between the vehicle speed and the second threshold; according to the judgment result, switch the operation of the hybrid drive system 10 model. It should be noted that the first threshold is used to judge the SOC value of the power battery, and the second threshold is used to judge the speed of the vehicle. This embodiment does not limit the value ranges of the first threshold and the second threshold. The control strategy is freely set, and under different control strategies, the values of the first threshold and the second threshold are different. After the first threshold value and the second threshold value are set, it is automatically determined and automatically switched between various modes according to the determination result.

The above nine modes are embodied in the table as follows:

Second Embodiment

11 is a schematic structural diagram of a hybrid drive system according to a second embodiment of the present invention. As shown in FIG. 11 , the structure of the hybrid drive system 10 of this embodiment is substantially the same as that of the hybrid drive system 10 of the first embodiment, and the difference lies in the connection relationship between the engine 11 and the planetary gear device, and the clutch gear device and the planetary gear device. connections are different.

Specifically, in this embodiment, the first rotating element is the ring gear 126 , the second rotating element is one of the sun gear 121 and the planet carrier 124 , and the third rotating element is the other one of the sun gear 121 and the planet carrier 124 . For brake 151 or one-way clutch. For the connection relationship and driving method of the components of the hybrid drive system 10, please refer to the first embodiment. Third Embodiment

FIG. 12 is a schematic structural diagram of a hybrid drive system according to a third embodiment of the present invention. As shown in FIG. 12 , the structure of the hybrid drive system 10 of the present embodiment is substantially the same as that of the hybrid drive system 10 of the first embodiment, and the difference lies in the connection relationship between the engine 11 and the planetary gear device, and the clutch gear device and the planetary gear device. connections are different.

Specifically, in this embodiment, the first rotation element is the planet carrier 124 , the second rotation element is one of the sun gear 121 and the ring gear 126 , the third rotation element is the other of the sun gear 121 and the ring gear 126 , and the switch device For brake 151 or one-way clutch. For the connection relationship and driving method of the components of the hybrid drive system 10, please refer to the first embodiment.

The engine 11 and the first motor 13 of the hybrid drive system 10 of the hybrid drive system 10 of the present invention are both connected to the planetary gear device, and the clutch gear device is arranged between the engine 11 and the first motor 13; the planetary gear device includes a first A rotating element, a second rotating element and a third rotating element, the first rotating element has a rotating axle 122, the first motor 13 is connected with the rotating axle 122; the clutch gear device includes a first clutch 141 and a second clutch 142, the first clutch 141 Connecting the engine 11 and the rotating axle 122, the second clutch 142 connects the first rotating element and the third rotating element; the second motor 17 is arranged in parallel with the first motor 13, and the second motor 17 is connected to the output end. The hybrid drive system 10 of the present invention can operate in the single-motor pure electric mode, the dual-motor pure electric first-gear mode, the dual-motor pure electric second-gear mode, the range-extending mode, the engine-driven first-gear mode, the engine-single-drive second-gear mode, It works in the first-level hybrid mode, the second-level hybrid mode and the parking power generation mode, which has strong flexibility. Moreover, the engine 11 and the first motor 13 are connected through a planetary gear device, the speed ratio is adjustable, and the speed ratio range is large, which can effectively reduce the volume of the first motor 13 . In addition, when the hybrid drive system 10 of the present invention performs mode switching, the second motor 17 participates in driving, and there is no problem of power interruption. In addition, the hybrid drive system 10 of the present invention can cover HEV models and PHEV models, and is well platformed.

It is worth mentioning that the engine 11 of the hybrid drive system 10 of the present invention is connected to the sun gear 121 , and the ratio of the speed ratio (the gear ratio) of the two gears in the system is relatively large, so the hybrid drive system 10 The power performance is better.

The present invention is not limited to the specific details in the above-mentioned embodiments, and within the scope of the technical concept of the present invention, various simple modifications can be made to the technical solutions of the present invention, and these simple modifications all belong to the protection scope of the present invention. The various specific technical features described in the above-mentioned specific embodiments may be combined in any suitable manner under the condition of no contradiction. In order to avoid unnecessary repetition, the present invention will not describe various possible combinations.

Claims (12)

1. A hybrid drive system is characterized in that, comprising: An engine, a first motor, a second motor, a planetary gear device, a clutch gear device and a switch device, the engine and the first motor are both connected to the planetary gear device, and the clutch gear device is provided between the engine and the between the first motors; The planetary gear device includes a first rotating element, a second rotating element and a third rotating element, the first rotating element has a rotating axle, and the first motor is connected with the rotating axle; the clutch gear device includes a first clutch connecting the engine and the rotating axle, and a second clutch connecting the first rotating element and the third rotating element; the switch device locks or unlocks the third rotary element; The second motor is arranged in parallel with the first motor, and the second motor is connected to the output end. 2 . The hybrid drive system of claim 1 , wherein the second clutch includes a driving portion and a driven portion, the driving portion is connected to the rotating axle, and the driven portion is connected to the the third rotating element; or, the driven part is connected to the rotating axle, and the driving part is connected to the third rotating element. 3 . The hybrid drive system of claim 1 , wherein the first rotating element is a sun gear, the second rotating element is a planet carrier, the third rotating element is a ring gear, and the The switch device is a brake or a one-way clutch; The first motor has a first motor output shaft, the first motor output shaft is provided with a first gear, the rotating wheel shaft is provided with a second gear, and the first gear and the second gear are meshed with each other ; The engine and the rotating axle are engaged when the first clutch operates; the sun gear and the ring gear are locked when the second clutch operates; the brake or one-way clutch brakes or unlocks the ring gear; The hybrid drive system further includes an intermediate shaft, and a third gear is arranged on the intermediate shaft, and the third gear is in mesh with the planet carrier; The second motor has a second motor output shaft, the second motor output shaft is provided with a fourth gear, and the fourth gear and the third gear are in mesh with each other. 4 . The hybrid drive system according to claim 3 , wherein the hybrid drive system further comprises a differential gear, the differential gear is provided with a differential gear, and the intermediate shaft is further provided with a differential gear. 5 . There is a fifth gear intermeshing with the differential gear. 5 . The hybrid drive system according to claim 3 , wherein the hybrid drive system has a single-motor pure electric mode, a dual-motor pure electric first-gear mode, a dual-motor pure electric second-gear mode, and a range extension mode. 6 . , The engine alone drives the first gear mode, the engine alone drives the second gear mode, the first-level hybrid mode, the second-level hybrid mode and the parking power generation mode. 6 . The hybrid drive system according to claim 5 , wherein, in the single-motor pure electric mode, the first clutch, the second clutch, the brake or the one-way clutch, the The engine and the first motor do not work, and the second motor drives; in the dual-motor pure electric first gear mode, the engine, the first clutch and the second clutch do not work, so The brake or the one-way clutch works, the brake or the one-way clutch brakes the ring gear, and both the first motor and the second motor are driven; in the two-motor pure electric second gear mode, all the The engine and the first clutch do not work, the brake or one-way clutch does not work, the second clutch works, the second clutch locks the sun gear and the ring gear, the first motor and Both the second motors are driven. 7. The hybrid drive system of claim 5, wherein, in the extended range mode, the first clutch is active, the first clutch engages the engine and the rotating axle, the The second clutch does not work, the brake or the one-way clutch does not work, the engine drives the first motor to generate electricity, the first motor provides electrical energy for the second motor, and the second motor drives. 8 . The hybrid drive system according to claim 5 , wherein, in the mode of driving the first gear alone by the engine, the first clutch is activated, the brake or the one-way clutch is activated, and the first clutch is activated. 9 . The engine and the rotating axle are engaged, the brake or one-way clutch brakes the ring gear, the second clutch, the first motor, and the second motor are all deactivated, and the engine drives ; In the engine alone driving second gear mode, the first clutch and the second clutch operate, the first clutch engages the engine and the rotating axle, and the second clutch locks the sun gear And the ring gear, the first motor, the second motor, and the brake or the one-way clutch all do not work, and the engine drives. 9 . The hybrid drive system of claim 5 , wherein in the one-stage hybrid mode, the first clutch is activated, the brake or one-way clutch is activated, and the first clutch is engaged. 10 . the engine and the rotating axle, the brake or the one-way clutch brakes the ring gear, the second clutch does not work, the engine, the first motor and the second motor are driven; in In the two-stage hybrid mode, the first clutch and the second clutch operate, the first clutch engages the engine and the rotating axle, and the second clutch locks the sun gear and the The ring gear, the brake or the one-way clutch do not work, and the engine, the first motor and the second motor are all driven. 10 . The hybrid drive system of claim 5 , wherein, in the park power generation mode, the first clutch is active, the first clutch engages the engine and the rotating axle, and the The second clutch and the brake or the one-way clutch do not work, and the power of the engine is transmitted to the first motor to generate electricity. 11. The hybrid drive system according to claim 1, wherein the first rotating element is a sun gear, the second rotating element is one of a ring gear and a planet carrier, and the third rotating element is a The ring gear is the other of the planet carrier, and the switch device is a brake or a one-way clutch. 12 . The hybrid drive system of claim 1 , wherein the first rotating element is a planet carrier, the second rotating element is one of a sun gear and a ring gear, and the third rotating element is 12 . The sun gear and the ring gear are the other, and the switch device is a brake or a one-way clutch.

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