CN114940059A - Hybrid power system with multiple clutches and automobile - Google Patents

Abstract

The invention relates to a hybrid system with multiple clutches, comprising: the system comprises a power battery, a gearbox, an engine, a first motor, a second motor, a first motor controller, a second motor controller, a first clutch, a second clutch and a third clutch; the first motor and the second motor are connected with the power battery through a motor controller; the engine is connected with the first clutch, the first motor is connected with the second clutch, the first clutch, the second clutch are connected with the third clutch, and the third clutch and the second motor are connected to the gearbox together; and the controller is respectively connected with the first clutch, the second clutch, the third clutch, the first motor, the second motor, the first motor controller and the second motor controller, and controls the clutch states of the first clutch, the second clutch and the third clutch, the gears of the first motor and the second motor and the working modes of the first motor controller and the second motor controller according to the working mode of the hybrid power system.

Description

A hybrid power system and vehicle with multiple clutches

technical field

The invention relates to a hybrid power system of a hybrid vehicle, in particular to a hybrid power system with multiple clutches and a vehicle.

Background technique

As shown in FIG. 1 , in the current hybrid power system of the prior art, when the transmission gear is 1st or 3rd gear and the engine participates in direct drive, the engine needs to drive the first motor and the second motor.

The above technical solutions have the following technical problems: when the two motors participate in the direct drive of the engine, they will drive the two motors to run, causing part of the output power of the engine to be lost in driving the two motors to run.

As shown in FIG. 2, the prior art also provides a hybrid power system, which can solve the problem of starting damage and use the first motor to drive the vehicle when the available power of the power battery is high; when the available power of the power battery is lower than a certain value , Since the power split can only participate in the direct drive when the vehicle speed reaches a certain value, the engine cannot directly drive the vehicle at low speed. , In this type of configuration, when the available power of the power battery is less than a certain value, the engine cannot directly drive the vehicle at low speed, so that road assistance can only be called.

SUMMARY OF THE INVENTION

In order to solve the above technical problems, the present invention provides a hybrid power system with multiple clutches and an automobile.

The technical scheme of the present invention is:

The present invention provides a hybrid power system with multiple clutches, comprising: a power battery, a gearbox, an engine, a first motor, a second motor, a first motor controller, a second motor controller, a first clutch, a second motor clutch and third clutch;

The first motor, the first motor controller and the power battery are connected by a high-voltage wire harness, and the second motor, the second motor controller and the power battery are connected by a high-voltage wire harness;

The engine is mechanically connected to the first clutch, the first motor is mechanically connected to the second clutch, the first clutch, the second clutch and the third clutch are mechanically connected to each other, the The third clutch is then mechanically connected to the gearbox together with the second electric machine;

a controller, the controller communicates with the engine, the gearbox, the first clutch, the second clutch, the third clutch, the first motor, and the second motor respectively through a low-voltage wire harness , The first motor controller and the second motor controller are connected, the first motor and the first motor controller are connected through a low-voltage wiring harness, and the second motor and the second motor controller are connected through Low-voltage wiring harness connection;

The controller is configured to receive an external command, determine an operating mode of the hybrid power system according to the external command, and adjust the first clutch, the second clutch and the hybrid power system according to the operating mode of the hybrid power system. The clutch state of the third clutch and the working modes of the first motor and the second motor are controlled;

Wherein, the working modes of the first motor and the second motor include a drive mode, a power generation mode and a standby mode.

Preferably, the rated power of the engine, the first motor and the second motor are all the same, the peak power of the first motor and the second motor are all the same, and the power of the first motor and the second motor are all the same and, or, the power sum of the engine and the second electric machine outputs the maximum rated and peak power for the hybrid system.

Preferably, if it is determined that the operating mode of the hybrid system is an engine direct drive mode, the controller controls the third clutch to be disconnected, and controls the first clutch and the second clutch to be engaged; A motor controller controls the first motor to switch to a drive mode, and the DC electric energy output by the high voltage of the power battery is converted into kinetic energy through the first motor controller and the first motor, so as to drive the engine to start;

After the engine is started, the controller controls the second clutch to be disconnected and the third clutch to be engaged; the first motor controller controls the first motor to be in a standby mode, and the power output by the engine passes through the first clutch and the third clutch are transmitted to a transmission to drive the vehicle;

When the engine direct drive works in the optimal speed working range and the output power of the engine is greater than the driving demand of the vehicle, if the SOC of the power battery is lower than the preset SOC, the controller controls the second motor to switch to power generation through the second motor controller In the mode, the second motor and the second motor controller convert the excess kinetic energy of the engine into electrical energy, thereby charging the power battery.

Preferably, if it is determined that the working mode of the hybrid power system is the failure mode, the second motor is not locked and cannot output power, or, the discharge power of the power battery is less than the preset power and the remaining fuel in the engine exceeds the preset fuel The controller controls the third clutch to be disconnected, controls the first clutch and the second clutch to be engaged; controls the first motor to switch to the drive mode through the first motor controller, The DC electric energy output by the high voltage of the power battery is converted into kinetic energy by the first motor controller and the first motor to drive the engine to start; after the engine is started, the controller controls the second clutch to disconnect , the third clutch is engaged, the first motor is controlled by the first motor controller to be in a standby mode, and the power output by the engine is transmitted to the transmission via the first clutch and the third clutch to drive the vehicle;

If it is determined that the working mode of the hybrid power system is the failure mode, the controller controls the first clutch to disconnect when the second motor is not locked and cannot output power, the engine cannot work, and the discharge power of the power battery is greater than the preset power. open, control the second clutch and the third clutch to combine; control the first motor to switch to the drive mode through the first motor controller, and the DC power output by the high voltage of the power battery passes through the first motor controller and the first motor Converted into kinetic energy, the power output by the first motor is transmitted to the transmission via the second clutch and the third clutch to drive the vehicle.

Preferably, if it is determined that the working mode of the hybrid power system is a general pure electric drive mode or the power battery SOC is lower than a preset SOC, the controller controls the first clutch to the third clutch to be disconnected, and the The second motor controller controls the second motor to switch to the drive mode, the DC electric energy output by the high voltage of the power battery is converted into kinetic energy through the second motor controller and the second motor, and the power output by the second motor is transmitted to the transmission to drive the vehicle;

If it is determined that the working mode of the hybrid power system is the enhanced pure electric driving mode, the SOC of the power battery is higher than the preset SOC, and the power discharged by the power battery is greater than the peak power of the second motor, the controller controls the first clutch to be disconnected , the second clutch to the third clutch are all engaged, the first motor controller is controlled to switch the first motor to the drive mode, and the second motor controller is controlled to switch the second motor to the drive mode, so The DC electric energy output by the high voltage of the power battery is converted into kinetic energy by the first motor controller, the second motor controller and the corresponding first motor and the second motor, and the power output by the first motor and the second motor is transmitted to the transmission. drive the vehicle.

Preferably, if it is determined that the working mode of the hybrid system is a series working mode, the controller controls the third clutch to be disconnected, and controls the first clutch and the second clutch to be engaged; The motor controller controls the first motor to switch to the drive mode, the second motor controller controls the second motor to switch to the drive mode, and a part of the high-voltage DC power output by the power battery passes through the first motor controller and the first motor is converted into kinetic energy to drive the engine to start; the other part of the high-voltage DC electrical energy output by the power battery is converted into kinetic energy through the second motor controller and the second motor, and the power output by the second motor transmitted to the transmission to drive the vehicle;

After the engine is started, the first motor is controlled by the first motor controller to switch to the power generation mode, the engine drives the first motor to rotate, and the first motor and the first motor controller convert the kinetic energy of the engine into The electrical energy is used for the second electric motor to drive the vehicle and to charge the power battery with excess electrical energy.

Preferably, if it is determined that the operating mode of the hybrid power system is a parallel operating mode, the controller controls the third clutch to be disconnected, the first clutch and the second clutch to be engaged; The controller controls the first motor to switch to the drive mode, and the second motor controller controls the second motor to switch to the drive mode, and part of the high-voltage DC power output from the power battery passes through the first motor controller and the corresponding The first motor is converted into kinetic energy, and the power output by the first motor is transmitted to the engine through the second clutch and the first clutch to drive the engine to start; the other part of the high-voltage direct current power output by the power battery passes through the second clutch and the first clutch. The two-motor controller and the second motor are converted into kinetic energy, and the power output by the second motor is transmitted to the transmission to drive the vehicle;

After the engine is started, the controller controls the second clutch to be disconnected and the third clutch to be engaged, and the first motor controller controls the first motor to switch to the standby mode, and the high voltage output by the power battery The direct current electric energy is converted into kinetic energy by controlling the second motor through the second motor controller, and is transmitted to the transmission together with the power output by the engine through the first clutch and the second clutch to drive the vehicle.

Preferably, if it is determined that the working mode of the hybrid power system is the energy recovery mode, the second motor is controlled by the second motor controller to switch to the power generation mode, and the power transmitted by the gearbox is provided to the first motor. Two motors, the second motor and the second motor controller convert kinetic energy into electrical energy, thereby charging the power battery.

Preferably, the engine is a low-voltage-free starter, which is not started by a vehicle-mounted 12V low-voltage battery.

Preferably, the second motor is mechanically connected to the gearbox through a fourth clutch, and the fourth clutch is connected to the controller through a low-voltage wiring harness;

If it is determined that the operating mode of the hybrid system is the failure mode and the second motor is locked, the controller controls the fourth clutch to be disconnected.

Preferably, the engine is started by the on-board 12V low-voltage battery. If it is determined that the working mode of the hybrid power system is the failure mode and the maximum discharge power of the power battery is 0, the controller starts the engine by controlling the 12V low-voltage battery, and controls the first A clutch is combined with the third clutch to control the disconnection of the second clutch, and the engine power is transferred to the gearbox to directly drive the vehicle through the combination of the first clutch and the third clutch.

Preferably, the engine is started by the on-board 12V low-voltage battery. If it is determined that the operating mode of the hybrid power system is the failure mode and the maximum discharge power of the power battery is 0, the controller starts the engine by controlling the 12V low-voltage battery, and controls the first A clutch is combined with the third clutch to control the disconnection of the second clutch and the fourth clutch, and the engine power is transferred to the gearbox to directly drive the vehicle through the combination of the first clutch and the third clutch.

The present invention also provides an automobile, including the above-mentioned hybrid power system with multiple clutches.

The beneficial effects of the present invention are:

1. By controlling the combination of disconnection and combination of the first clutch, the second clutch and the third clutch, the power distribution of the first motor, the second motor and the engine is controlled to realize various working modes.

2. For the scheme where the fourth clutch is not designed, after the first motor drives the engine to start, if the engine participates in driving, the second clutch is disconnected, which can isolate the first motor, so that the power loss of the engine driving is in the first motor. Part of it can be used for driving, which improves the efficiency of the direct drive of the engine; for the scheme of designing the fourth clutch, after the first motor drives the engine to start, if the engine participates in driving, the second clutch and the fourth clutch are disconnected, and the The first motor and the second motor are isolated, so that part of the energy lost in the driving power of the engine in the first motor and the second motor can be used for driving, which further improves the efficiency of the direct driving of the engine;

3. Since the rated power and peak power of the engine, the first motor and the second motor are set to be the same, the maximum power output by the vehicle is the sum of the power of the engine and the second motor, or the sum of the power of the first motor and the second motor. In this way, the single power of the engine and the first and second motors can be selected as half of the maximum power of the whole vehicle, the corresponding volume is correspondingly smaller, and the space saved can be placed in the gearbox of a traditional car, so the gearbox of this scheme can be based on It is developed based on the excellent gearbox of traditional fuel vehicles, reducing the development cycle and development cost.

4. When the second motor fails and cannot output power (non-rotor cannot rotate); the power battery has a serious failure, which causes the maximum discharge power of the power battery to be limited to less than the preset power; or the maximum discharge power of the power battery is limited to greater than When the preset power, the second motor failure cannot output power (non-rotor cannot rotate), and the engine cannot work, it can also maintain the motion of the vehicle, increasing the application scenarios of vehicle failures.

Description of drawings

1 is a configuration diagram of a hybrid power system in the prior art;

2 is a configuration diagram of a hybrid power system in the prior art;

FIG. 3 is a configuration diagram of a hybrid power system according to the first embodiment of the present invention;

4 is a configuration diagram of a hybrid power system according to a second embodiment of the present invention;

FIG. 5 is a configuration diagram of a hybrid power system according to a third embodiment of the present invention;

FIG. 6 is a configuration diagram of a hybrid power system according to a third embodiment of the present invention.

Detailed ways

3, the first embodiment of the present invention provides a hybrid power system with multiple clutches, including: a power battery, a gearbox, an engine, a first motor, a second motor, a first motor controller, and a second motor control clutch, first clutch, second clutch and third clutch;

The first motor, the first motor controller and the power battery are connected by a high-voltage wire harness, and the second motor, the second motor controller and the power battery are connected by a high-voltage wire harness;

The engine is mechanically connected to the first clutch, the first motor is mechanically connected to the second clutch, the first clutch, the second clutch and the third clutch are mechanically connected to each other, and the third clutch and the second motor are mechanically connected to the gearbox;

The controller is connected with the engine, the gearbox, the first clutch, the second clutch, the third clutch, the first motor, the second motor, the first motor controller and the second motor controller through the low-voltage wiring harness respectively. The motor and the first motor controller are connected through a low-voltage wire harness, and the second motor and the second motor controller are connected through a low-voltage wire harness;

The controller is configured to receive an external command, and determine the working mode of the hybrid power system according to the external command, and the clutch states of the first clutch, the second clutch and the third clutch, the first motor and the second motor according to the working mode of the hybrid power system. control the working mode;

Wherein, the working modes of the first motor and the second motor include a drive mode, a power generation mode and a standby mode.

The above-mentioned controllers that output control signals to the first clutch, the second clutch, the third clutch, the engine, the gearbox, the first motor controller and the second motor controller can be an integrated controller or an independent controller. device. That is, the control functions of the first clutch to the third clutch are integrated into a single clutch controller, and the control functions of the engine, transmission, the first motor controller, the second motor controller, and the clutch controller are integrated into another controller (such as vehicle controller).

In this embodiment, the first to third clutches may be multi-spring clutches or diaphragm clutches.

Wherein, the external command may be derived from the driver's command, or may be the command determined according to the parameters of the whole vehicle.

The working modes of the hybrid system include: pure electric drive mode, engine direct drive mode, series working mode, parallel working mode, failure mode and energy recovery mode.

Among them, if the gearbox does not have an R gear, the engine direct drive mode, parallel working mode and energy recovery mode can only work in forward gears (such as D gear).

Specifically, the pure electric drive mode includes the vehicle's default general pure electric drive mode and the driver's input enhanced pure electric drive mode. Generally, the pure electric drive mode is the default mode of the vehicle; when the power battery SOC is lower than the preset SOC, even if the driver inputs the enhanced pure electric drive mode, the vehicle cannot enter the enhanced pure electric drive mode, that is, enter the enhanced pure electric drive mode. In pure electric drive mode, the power battery SOC is required to be higher than the preset SOC.

In the general pure electric drive mode, no matter whether the transmission is in R gear or not, the controller controls the first clutch to the third clutch to be disconnected, and the second motor controller controls the second motor to switch to the drive mode, and the DC power output by the high voltage of the power battery It can be converted into kinetic energy through the second motor controller and the second motor, and the power output by the second motor is transmitted to the transmission to drive the vehicle forward or backward.

In the enhanced pure electric drive mode, no matter whether the transmission has R gear or not, if the power battery SOC is higher than the preset SOC and the power battery discharge power is greater than the peak power of the second motor, the controller controls the first clutch to be disconnected and the second clutch to be disconnected. To the third clutch are all combined, the first motor controller is controlled to switch the first motor to the drive mode, the second motor controller is controlled to switch the second motor to the drive mode, and the DC power output by the high voltage of the power battery is controlled by the first motor controller. , the second motor controller and the corresponding first and second motors are converted into kinetic energy, and the power output by the first and second motors is transmitted to the transmission to drive the vehicle forward or backward.

In the above-mentioned pure electric drive mode, the engine does not participate in the work, so the first clutch is always in a disconnected state. Due to the arrangement of the second clutch, the vehicle can be driven selectively according to the user's choice of two ways of providing normal or stronger driving force. When the second motor, or, the first motor and the second motor are switched to the driving mode, the power output by the first motor and the second motor is transmitted to the transmission shaft of the vehicle through the gearbox, so as to realize the driving of the vehicle.

The engine direct drive mode can work with the transmission having an R gear or not having an R gear.

When the transmission has an R gear, the engine direct drive mode can only work when the vehicle is in a forward gear; when the transmission has an R gear, the engine direct drive mode can work in either a forward gear or a reverse gear.

If it is determined that the working mode of the hybrid system is the engine direct drive mode, the controller controls the third clutch to be disconnected and the first clutch and the second clutch to be connected; the first motor controller controls the first motor to switch to the drive mode, and the power battery The DC electric energy output by the high voltage is converted into kinetic energy through the first motor controller and the first motor to drive the engine to start;

After the engine is started, the controller controls the second clutch to be disconnected and the third clutch to be engaged; the first motor controller controls the first motor to be in standby mode, and the power output by the engine is transmitted to the gearbox through the first clutch and the third clutch. Drive the vehicle (here, if the gearbox does not have an R gear, the engine can only drive the vehicle forward);

When the engine direct drive works in the optimal speed working range and the output power of the engine is greater than the driving demand of the vehicle, if the SOC of the power battery is lower than the preset SOC, the controller controls the second motor to switch to the power generation mode through the second motor controller. The motor and the second motor controller convert the excess kinetic energy of the engine into electrical energy, thereby charging the power battery.

In the above-mentioned engine direct drive mode, if the transmission of the vehicle does not have an R gear, the engine direct drive mode can only work in the forward gear.

In this engine direct drive mode, the engine no longer needs to supply energy for the first motor that does not need to work, which can save the energy of the engine and improve the utilization efficiency of the engine. Moreover, when the energy provided by the engine is too much, the second motor can also be driven to generate electricity to charge the power battery, so as to realize the energy recovery of the engine.

In this first embodiment, a scenario where the vehicle can continue to run under certain fault conditions is also provided. Specifically, the following fault application scenarios are included: if it is determined that the operating mode of the hybrid power system is the fault mode, the second motor is not locked (that is, the second motor can rotate) and cannot output power, or the discharge power of the power battery When the power is less than the preset power and the remaining fuel amount in the engine exceeds the preset fuel amount, the controller controls the third clutch to be disconnected, and controls the first clutch and the second clutch to be engaged; the first motor is controlled by the first motor controller to switch to drive mode, the DC electric energy output by the high voltage of the power battery is converted into kinetic energy by the first motor controller and the first motor to drive the engine to start; after the engine is started, the controller controls the second clutch to be disconnected and the third clutch to be engaged. A motor controller controls the first motor to be in a standby mode, and the power output by the engine is transmitted to the transmission via the first clutch and the third clutch to drive the vehicle.

In the above failure mode, the energy of the engine is used to drive the vehicle. At this time, when the gearbox does not have an R gear, the failure mode can only work when the vehicle transmission gear is the forward gear, and can only use the energy of the engine to drive the vehicle forward. When the transmission is in R gear, the fault mode can work in forward gear or reverse gear.

If it is determined that the working mode of the hybrid power system is the failure mode, when the second motor is not locked and cannot output power, the engine cannot work, and the discharge power of the power battery is greater than the preset power, the controller controls the first clutch to disconnect, controls the third The second clutch is combined with the third clutch; the first motor is controlled by the first motor controller to switch to the drive mode, the DC power output by the high voltage of the power battery is converted into kinetic energy through the first motor controller and the first motor, and the power output by the first motor The vehicle is driven forward or backward by being transmitted to the transmission via the second clutch and the third clutch. Under this condition, the output power of the first motor is used to drive the vehicle to continue to move. At this time, the transmission can be realized with or without R gear.

Compared with the existing scenarios, in the first embodiment, two application scenarios in which the vehicle can continue to drive when the vehicle fails are added.

In the first embodiment, the formation of the series working mode may be formed by a user's active input command, or may be formed according to vehicle parameters. The series working mode is the extended range mode again. In this mode, the controller controls the third clutch to disconnect, controls the first clutch and the second clutch to engage; controls the first motor to switch to the drive mode through the first motor controller, and controls the second motor to switch through the second motor controller In the driving mode, the high-voltage DC power output by the power battery is converted into kinetic energy by the first motor controller and the first motor to drive the engine to start; after the engine is started, the first motor is controlled by the first motor controller to switch to the power generation mode. , the engine drives the first motor to rotate, and the first motor and the first motor controller convert the kinetic energy of the engine into electrical energy, which is used for the second motor to drive the vehicle and the excess electrical energy to charge the power battery;

After the engine is started, the controller controls the first motor to switch to the power generation gear, controls the first motor controller to rectify and controls the first motor to switch to the power generation gear, and the power output by the engine is also transmitted to the No. 1 through the first clutch and the second clutch. A motor, the alternating current generated by the first motor is rectified into direct current power by the first motor controller, so as to charge the power battery.

In the above-mentioned series working mode, the power output by the engine is transmitted through the first motor to charge the power battery, and the power provided by the power battery is then transmitted to the gearbox to drive the vehicle through the second motor, forming a series connection state. In addition, due to the existence of the gearbox, the power consumption of the second motor when driving the vehicle at a high speed is low.

In the first embodiment, the parallel working mode is also called a hybrid mode. In this mode, if the gearbox does not have an R gear, the parallel working mode can only work in a forward gear. Specifically, if it is determined that the working mode of the hybrid power system is the parallel working mode and the gear of the vehicle is the forward gear, the controller controls the third clutch to be disconnected and the first clutch and the second clutch to be engaged; through the first motor controller Control the first motor to switch to the drive mode, control the second motor to switch to the drive mode through the second motor controller, and convert the high-voltage DC power output by the power battery into kinetic energy through the first motor controller and the corresponding first motor, and the first motor The output power is transmitted to the engine via the second clutch and the first clutch to drag the engine to start;

After the engine is started, the controller controls the second clutch to be disconnected and the third clutch to be engaged. The first motor controller controls the first motor to switch to standby mode, and the high-voltage DC power output from the power battery controls the second motor through the second motor controller. It is converted into kinetic energy and transmitted to the transmission together with the power output by the engine via the first clutch and the second clutch to drive the vehicle forward.

In this parallel working mode, the energy provided by the power battery is transmitted to the gearbox through the second motor to drive the vehicle, and the energy provided by the engine is also transmitted through the gearbox to drive the vehicle, forming a hybrid utilization of the energy of the engine and the power battery.

In addition, in the first embodiment, if it is determined that the working mode of the hybrid power system is the energy recovery mode (including coasting energy recovery and braking energy recovery), the second motor controller is controlled to switch the second motor to the power generation mode, and the The power transmitted by the gearbox is provided to the second motor, and the second motor and the second motor convert the kinetic energy into electrical energy by the controller, thereby charging the power battery.

In the above-mentioned first embodiment, the engine is not started by the 12V low-voltage battery of the vehicle; instead, the engine is started by being driven by the first motor with the energy provided by the power battery.

In the above-mentioned first embodiment of the present invention, by setting a hybrid system configuration of dual motors and three clutches, the vehicle integrates pure electric drive mode, engine direct drive mode, series operation mode, parallel operation mode, failure mode and energy recovery mode. After the first motor drives the engine to start, if the engine participates in driving, the second clutch is disconnected, which can isolate the first motor, so that the part of the engine driving power loss in the first motor can be used for driving, which improves the direct drive of the engine. When the second motor fails and cannot output power (non-rotor cannot rotate); a serious failure of the power battery causes the maximum discharge power of the power battery to be limited to less than the preset power; or the maximum discharge power of the power battery is limited to When the power is greater than the preset power, the second motor fails to output power (non-rotor cannot rotate), and the engine cannot work, the motion of the vehicle can also be maintained, increasing the application scenarios of vehicle failures. Since the rated power and peak power of the engine, the first motor and the second motor are set to be the same, the gearbox of this solution can be developed based on the excellent gearbox of traditional fuel vehicles, reducing the development cycle and development cost.

Referring to FIG. 4 , in the second embodiment of the present invention, a modification has been made on the basis of the above-mentioned first embodiment. That is, a fourth clutch mechanically connected with the controller is added between the second motor and the gearbox. At this time, based on the first embodiment, a fault usage scenario is added, that is, if it is determined that the operating mode of the hybrid power system is the fault mode and the second motor is locked, the controller controls the fourth clutch to be disconnected.

For other working modes in the first embodiment, if the second motor is required to work, the fourth clutch is controlled to be engaged, and if the second motor is not required to work, the fourth clutch is controlled to be disconnected.

In this second embodiment, on the basis of the above-mentioned first embodiment, after the first motor starts to drive the engine, if the engine participates in driving, the second clutch and the fourth clutch are disconnected, and the first motor and the fourth clutch can be disconnected. The two motors are isolated, so that part of the energy lost by the engine driving power in the first motor and the second motor can be used for driving, which further improves the efficiency of the direct drive of the engine; at the same time, it also increases the use scenario of continuing driving when the vehicle fails.

Referring to FIG. 5 , in the third embodiment, modifications are made on the basis of the above-mentioned first and second embodiments. That is, the engine is connected through the on-board 12V low-voltage battery, so that the engine can be started by the on-board 12V low-voltage battery when the first motor, the second motor or the power battery fails, thereby realizing the driving of the vehicle. Specifically, if it is determined that the working mode of the hybrid power system is the failure mode and the maximum discharge power of the power battery is 0, the controller starts the engine by controlling the 12 low-voltage battery, and controls the first clutch and the third clutch to be combined, and controls the second The clutch is disengaged to drive the vehicle directly from the engine. At this time, this embodiment may retain the presence of the fourth clutch in the second embodiment, as shown in FIG. 6 .

The present invention also provides an automobile comprising the above-mentioned multi-clutch.

Claims (13)

1. A hybrid power system with multiple clutches, comprising: a power battery, a gearbox, an engine, a first motor, a second motor, a first motor controller, a second motor controller, a first clutch, the second clutch and the third clutch; The first motor, the first motor controller and the power battery are connected by a high-voltage wire harness, and the second motor, the second motor controller and the power battery are connected by a high-voltage wire harness; The engine is mechanically connected to the first clutch, the first motor is mechanically connected to the second clutch, the first clutch, the second clutch and the third clutch are mechanically connected to each other, the The third clutch is then mechanically connected to the gearbox together with the second electric machine; a controller, the controller communicates with the engine, the gearbox, the first clutch, the second clutch, the third clutch, the first motor, and the second motor respectively through a low-voltage wire harness , The first motor controller and the second motor controller are connected, the first motor and the first motor controller are connected through a low-voltage wiring harness, and the second motor and the second motor controller are connected through Low-voltage wiring harness connection; The controller is configured to receive an external command, determine an operating mode of the hybrid power system according to the external command, and adjust the first clutch, the second clutch and the hybrid power system according to the operating mode of the hybrid power system. The clutch state of the third clutch and the working modes of the first motor and the second motor are controlled; Wherein, the working modes of the first motor and the second motor include a drive mode, a power generation mode and a standby mode. 2 . The hybrid power system with multiple clutches according to claim 1 , wherein the rated power of the engine, the first electric machine and the second electric machine are all the same, and the first electric machine and the second electric machine have the same rated power. 3 . The peak powers of the second electric machines are all the same, and the sum of the powers of the first electric machine and the second electric machine, or the sum of the powers of the engine and the second electric machine, outputs the maximum rated and peak power for the hybrid system. 3 . The hybrid power system with multiple clutches according to claim 1 , wherein if it is determined that the operating mode of the hybrid power system is an engine direct drive mode, the controller controls the third clutch to disconnect, Control the combination of the first clutch and the second clutch; control the first motor to switch to the drive mode through the first motor controller, and the DC power output by the high voltage of the power battery passes through the first motor controller and the first motor controller. a motor converted into kinetic energy to propel the engine to start; After the engine is started, the controller controls the second clutch to be disconnected and the third clutch to be engaged; the first motor controller controls the first motor to be in a standby mode, and the power output by the engine passes through the first clutch and the third clutch are transmitted to a transmission to drive the vehicle; When the engine direct drive works in the optimal speed working range and the output power of the engine is greater than the driving demand of the vehicle, if the SOC of the power battery is lower than the preset SOC, the controller controls the second motor to switch to power generation through the second motor controller In the mode, the second motor and the second motor controller convert the excess kinetic energy of the engine into electrical energy, thereby charging the power battery. 4 . The hybrid power system with multiple clutches according to claim 1 , wherein, if it is determined that the working mode of the hybrid power system is a failure mode, the second motor is not locked and cannot output power, or the power When the discharge power of the battery is less than the preset power and the remaining fuel amount in the engine exceeds the preset fuel amount, the controller controls the third clutch to be disconnected, and controls the first clutch and the second clutch to be engaged; by The first motor controller controls the first motor to switch to a drive mode, and the DC electric energy output by the high voltage of the power battery is converted into kinetic energy through the first motor controller and the first motor to drive the engine to start; After the engine is started, the controller controls the second clutch to be disconnected and the third clutch to be engaged, and the first motor controller controls the first motor to be in a standby mode, and the power output by the engine passes through the engine. the first clutch and the third clutch are transmitted to the transmission to drive the vehicle; If it is determined that the working mode of the hybrid power system is the failure mode, the controller controls the first clutch to disconnect when the second motor is not locked and cannot output power, the engine cannot work, and the discharge power of the power battery is greater than the preset power. open, control the second clutch and the third clutch to combine; control the first motor to switch to the drive mode through the first motor controller, and the DC power output by the high voltage of the power battery passes through the first motor controller and the first motor Converted into kinetic energy, the power output by the first motor is transmitted to the transmission via the second clutch and the third clutch to drive the vehicle. 5 . The hybrid power system with multiple clutches according to claim 1 , wherein if it is determined that the operating mode of the hybrid power system is a general pure electric drive mode or the power battery SOC is lower than a preset SOC, the control The controller controls the first clutch to the third clutch to be disconnected, the second motor is controlled by the second motor controller to switch to the drive mode, and the DC power output by the high voltage of the power battery is controlled by the second motor The motor and the second motor are converted into kinetic energy, and the power output by the second motor is transmitted to the transmission to drive the vehicle; if it is determined that the working mode of the hybrid system is the enhanced pure electric drive mode, the power battery SOC is higher than the preset SOC and The power discharged from the power battery is greater than the peak power of the second motor, the controller controls the first clutch to be disconnected, the second clutch to the third clutch are all engaged, and the first motor controller controls the first motor The motor is switched to the drive mode, and the second motor is controlled to switch to the drive mode by the second motor controller, and the DC power output by the high voltage of the power battery passes through the first motor controller, the second motor controller and the corresponding first motor , The second motor is converted into kinetic energy, and the power output by the first motor and the second motor is transmitted to the transmission to drive the vehicle. 6 . The hybrid power system with multiple clutches according to claim 1 , wherein if it is determined that the working mode of the hybrid power system is a series working mode, the controller controls the third clutch to disconnect, control the The first clutch and the second clutch are combined; the first motor is controlled by the first motor controller to switch to the driving mode, and the second motor is controlled by the second motor controller to switch to the driving mode , a part of the high voltage DC power output by the power battery is converted into kinetic energy by the first motor controller and the first motor to drive the engine to start; the other part of the high voltage DC power output by the power battery is passed through the second motor The controller and the second motor are converted into kinetic energy, and the power output by the second motor is transmitted to the transmission to drive the vehicle; after the engine is started, the first motor is controlled by the first motor controller to switch to the power generation mode, and the engine drives the The first motor rotates, and the first motor and the first motor controller convert the kinetic energy of the engine into electrical energy, which is used by the second motor to drive the vehicle and charge the power battery with excess electrical energy. 7 . The hybrid power system with multiple clutches according to claim 1 , wherein if it is determined that the operating mode of the hybrid power system is a parallel operating mode, the controller controls the third clutch to disconnect, control the The first clutch and the second clutch are combined; the first motor controller is controlled to switch the first motor to the drive mode, the second motor controller is controlled to switch the second motor to the drive mode, and the power battery outputs A part of the high-voltage DC electric energy is converted into kinetic energy through the first motor controller and the corresponding first motor, and the power output by the first motor is transmitted to the engine through the second clutch and the first clutch to drive the engine. The engine is started; the other part of the high-voltage direct current electric energy output by the power battery is converted into kinetic energy through the second motor controller and the second motor, and the power output by the second motor is transmitted to the transmission to drive the vehicle; After the engine is started, the controller controls the second clutch to be disconnected and the third clutch to be engaged, and the first motor controller controls the first motor to switch to the standby mode, and the high voltage output by the power battery The direct current electric energy is converted into kinetic energy by controlling the second motor through the second motor controller, and is transmitted to the transmission together with the power output by the engine through the first clutch and the second clutch to drive the vehicle. 8 . The hybrid power system with multiple clutches according to claim 1 , wherein if it is determined that the working mode of the hybrid power system is an energy recovery mode, the second motor is controlled by the second motor controller. 9 . Switching to the power generation mode, the power transmitted by the gearbox is provided to the second motor, and the second motor and the second motor convert the kinetic energy into electrical energy by the controller, thereby charging the power battery. 9 . The hybrid power system with multiple clutches according to claim 1 , wherein the engine is a low-voltage-free starter, which is not started by a vehicle-mounted 12V low-voltage battery. 10 . 10. The hybrid power system with multiple clutches according to any one of claims 1 to 8, wherein the second electric machine is mechanically connected to the gearbox through a fourth clutch, and the fourth clutch is connected through a low pressure The wiring harness is connected with the controller; If it is determined that the operating mode of the hybrid system is the failure mode and the second motor is locked, the controller controls the fourth clutch to be disconnected. 11 . The hybrid power system with multiple clutches according to claim 1 , wherein the engine is started by a vehicle-mounted 12V low-voltage battery. If it is determined that the operating mode of the hybrid power system is a failure mode and the maximum discharge of the power battery is determined. 12 . When the power is 0, the controller starts the engine by controlling the 12V low-voltage battery, and controls the combination of the first clutch and the third clutch, and controls the disconnection of the second clutch, and the engine power is transferred to the speed change through the combination of the first clutch and the third clutch. The box drives the vehicle directly. 12 . The hybrid power system with multiple clutches according to claim 10 , wherein the engine is started by a vehicle-mounted 12V low-voltage battery, and if it is determined that the operating mode of the hybrid power system is a failure mode and the maximum discharge of the power battery is determined. 13 . When the power is 0, the controller starts the engine by controlling the 12 low-voltage battery, and controls the first clutch and the third clutch to be engaged, and the second clutch and the fourth clutch to be disconnected, and the engine power is connected through the first clutch and the third clutch. Transfer to the gearbox for direct drive vehicles. 13. An automobile, characterized by comprising the hybrid power system with multiple clutches according to any one of claims 1 to 12.

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