Automobile power system, range extended electric vehicle and control method

Abstract

The application relates to the technical field of electric vehicles, in particular to an automobile power system, a range-extended electric vehicle and a control method, wherein the system comprises: an engine and a first motor integrated with driving, power generation and starting functions; a first clutch arranged between the engine and the first motor; and a second clutch arranged between the first motor and a first drive shaft; wherein the first motor realizes the starting function, the power generation function and the driving function through cooperation between the first clutch and the second clutch. Therefore, the problems in the prior art that the range-extended generator of the range-extended electric vehicle only provides the power generation function, the hybrid driving form is complex, the control logic is difficult to realize, and the cost of realizing the four-wheel drive function is high and the like are solved.

Description

Technical Field

[0001] This application relates to the field of electric vehicle technology, and in particular to an automotive powertrain system, a range-extended electric vehicle, and a control method thereof. Background Technology

[0002] New energy electric vehicles mainly include pure electric vehicles, plug-in hybrid electric vehicles, and range-extended electric vehicles. Currently, pure electric vehicles are powered entirely by rechargeable batteries. Although they are environmentally friendly, energy-saving, and have low noise, they still cannot meet user needs when dealing with conditions such as long-distance travel at high speeds and low temperatures in winter. Among them, range-extended electric vehicles can meet the needs of commuting by pure electric vehicles and can make up for the shortcomings of pure electric vehicles, such as insufficient range at high speeds and short range in low temperatures in winter. They achieve zero emissions, low fuel consumption at medium and low speeds, and no range anxiety when driving in pure electric vehicles.

[0003] In related technologies, the range-extended electric vehicle's range-extending engine drives the range-extending generator to generate electricity, which charges the power battery or provides power to the drive motor to drive the vehicle. The engine and range-extending motor do not participate in driving, but only provide power generation. The hybrid drive form has a complex structure, which makes the control logic difficult and the cost of realizing four-wheel drive is high. Summary of the Invention

[0004] This application provides an automotive powertrain system, a range-extended electric vehicle, and a control method to solve the problems in related technologies, such as the range extender generator of a range-extended electric vehicle only providing power generation, the complex structure of the hybrid drive form leading to high difficulty in control logic, and the high cost of realizing four-wheel drive function.

[0005] The first aspect of this application provides an automotive powertrain system, including: an engine and a first motor that integrates driving, generating, and starting; a first clutch disposed between the engine and the first motor; and a second clutch disposed between the first motor and a first drive shaft; wherein the first motor realizes starting, generating, and driving functions through the cooperation between the first clutch and the second clutch.

[0006] Optionally, it further includes: a controller connected to the first clutch and the second clutch, which controls the first clutch to close and the second clutch to disengage when the starting function or the power generation function is triggered, so that the first motor starts the engine, or the engine drives the first motor to generate electricity; and controls the first clutch to disengage and the second clutch to close when the driving function is triggered, so that the first motor drives the first drive shaft.

[0007] Optionally, it further includes: a first reducer and a first differential, wherein the first clutch is mechanically connected to the first reducer, the first reducer is mechanically connected to the first differential, and the first differential is mechanically connected to the first drive shaft.

[0008] Optionally, it further includes: a second motor that drives the second drive shaft; a first power battery for storing electrical energy in range-extending power generation or energy recovery operation, and providing electrical energy to the first motor when the drive function is triggered; and a second power battery for providing electrical energy to the second motor.

[0009] Optionally, the first power battery is a power type battery, and the second power battery is an energy type battery.

[0010] Optionally, it further includes: a power distribution unit, wherein the power distribution unit is electrically connected to the first motor, the second motor, the first power battery and the second power battery respectively.

[0011] Optionally, it further includes: a second reducer and a second differential, wherein the second motor is mechanically connected to the second reducer, the second reducer is mechanically connected to the second differential, and the second differential is mechanically connected to the first drive shaft.

[0012] Optionally, the first clutch is a normally closed clutch, and the second clutch is a normally open clutch.

[0013] A second aspect of this application provides a range-extended electric vehicle, including the vehicle powertrain system described in the above embodiments.

[0014] A third aspect of this application provides a control method for an automotive powertrain system. The method is used to control the automotive powertrain system as described in the above embodiments, wherein the method includes the following steps: detecting the current operating condition of the vehicle; triggering a starting function, a power generation function, or a driving function of a first motor according to the current operating condition, wherein when the starting function or the power generation function is triggered, controlling the first clutch to close and the second clutch to disengage, the first motor starts the engine, or the engine drives the first motor to generate electricity; when the driving function is triggered, controlling the first clutch to disengage and the second clutch to close, the first motor drives the first drive shaft.

[0015] Therefore, this application has at least the following beneficial effects:

[0016] In this embodiment of the application, the engine and the first motor that integrates drive, power generation and starting achieve starting, power generation and driving functions through the cooperation between the first clutch and the second clutch. By adding a range-extending auxiliary power unit to the electric vehicle, a multi-functional mode can be realized. The control logic is simple and four-wheel drive function can be achieved at low cost.

[0017] Additional aspects and advantages of this application will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of this application. Attached Figure Description

[0018] The above and / or additional aspects and advantages of this application will become apparent and readily understood from the following description of the embodiments taken in conjunction with the accompanying drawings, wherein:

[0019] Figure 1 This is a schematic diagram of the internal system of a range-extended hybrid electric vehicle in the prior art.

[0020] Figure 2 This is a structural diagram of a parallel hybrid power system in the existing technology;

[0021] Figure 3 This is a schematic diagram of an automotive powertrain system according to an embodiment of this application;

[0022] Figure 4 This is a schematic diagram of the power system of a range-extended electric vehicle provided according to an embodiment of this application;

[0023] Figure 5 This is a schematic diagram of pure electric driving condition 1 provided according to an embodiment of this application;

[0024] Figure 6 This is a schematic diagram of pure electric driving condition 2 provided according to an embodiment of this application;

[0025] Figure 7 This is a schematic diagram of pure electric driving condition 3 provided according to an embodiment of this application;

[0026] Figure 8 This is a schematic diagram of pure electric four-wheel drive driving condition 4 provided according to an embodiment of this application;

[0027] Figure 9 This is a schematic diagram of pure electric four-wheel drive driving condition 5 provided according to an embodiment of this application;

[0028] Figure 10 This is a schematic diagram of the extended-range driving condition 1 provided according to an embodiment of this application;

[0029] Figure 11 This is a schematic diagram of the extended-range driving condition 2 provided according to an embodiment of this application;

[0030] Figure 12 This is a schematic diagram of the extended-range driving condition 3 provided according to the embodiments of this application;

[0031] Figure 13 This is a schematic diagram of the extended-range driving condition 4 provided according to the embodiments of this application;

[0032] Figure 14 This is a schematic diagram of the engine starting conditions provided according to an embodiment of this application;

[0033] Figure 15 This is a schematic diagram of the idling power generation condition provided according to an embodiment of this application;

[0034] Figure 16 This is a schematic diagram of the energy recovery operating conditions provided according to the embodiments of this application;

[0035] Figure 17 This is a flowchart of a control method for an automotive powertrain system provided according to an embodiment of this application.

[0036] Explanation of reference numerals in the attached drawings: 1-Engine; 2-First clutch; 3-Second clutch; 4-First motor; 5-First reducer; 6-First differential; 7-Power distribution unit; 8-First power battery; 9-Second power battery; 10-Second motor; 11-Second reducer; 12-Second differential; 100-Automotive powertrain system. Detailed Implementation

[0037] The embodiments of this application are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain this application, and should not be construed as limiting this application.

[0038] Currently, the average range of pure electric vehicles is around 500km, which is sufficient for commuting in cities. However, it is still difficult to meet user needs when dealing with long-distance highway travel and low-temperature winter conditions. Extended-range electric vehicles have a clear advantage in this regard. Currently, the pure electric range of extended-range electric vehicles has reached over 200km, which can meet the needs of commuting by pure electric vehicle and overcome the shortcomings of pure electric vehicles such as insufficient range on long-distance highways and short range in low-temperature winter conditions.

[0039] In related technology 1, such as Figure 1 As shown, range-extended hybrid electric vehicles mainly rely on an engine to drive a range extender generator to generate electricity, which charges the power battery or provides power to the drive motor to drive the vehicle. The engine and range extender motor do not participate in driving; they can only provide power generation, resulting in limited applicability.

[0040] In related technology 2, such as Figure 2 As shown, hybrid drive forms are further divided into power split, series-parallel, planetary gear, etc., which can realize multiple modes such as pure electric drive, range-extended drive, engine direct drive, and engine and motor hybrid drive. It can achieve effective and smooth switching between different modes, and has a simple structure, which can effectively reduce fuel consumption. However, the battery price is high, the energy utilization efficiency is very low, the battery capacity is relatively small, and the overall cost is high.

[0041] The embodiments of this application mainly add a dual clutch, which enables the auxiliary drive of the first motor through the first clutch and the second clutch, thereby achieving four-wheel drive at low cost. At the same time, the hybrid structure of the first power battery and the second power battery is adopted, which has greater advantages in terms of cost and energy density.

[0042] The following description, with reference to the accompanying drawings, describes an embodiment of the vehicle powertrain, a range-extended electric vehicle, and a control method thereof. Specifically, Figure 3 This is a schematic diagram of an automotive powertrain system provided in an embodiment of this application.

[0043] like Figure 3 and Figure 4 As shown, the vehicle powertrain 100 includes: a first motor 4, a first clutch 2, and a second clutch 3.

[0044] The first motor 4 is an integrated motor that drives, generates electricity, and starts the engine 1; the first clutch 2 is located between the engine 1 and the first motor 4; the second clutch 3 is located between the first motor 4 and the first drive shaft; the first motor 4 achieves starting, power generation, and driving functions through the cooperation between the first clutch 2 and the second clutch 3.

[0045] Among them, the first clutch 2 is a normally closed clutch, and the second clutch 3 is a normally open clutch.

[0046] It is understood that the embodiments of this application mainly realize the auxiliary drive of the first motor, such as the starting function, power generation function and driving function, through the first clutch and the second clutch. The control is simple and the four-wheel drive function is realized at low cost.

[0047] It should be noted that the second clutch 3 is preferably integrated with the first clutch 1 as a dual-clutch, or it can be separated from the first clutch 1 and formed as a separate component. In the case of separate components, a hydraulic coupling is preferred, which is beneficial for the smooth control of power when the four-wheel drive is engaged.

[0048] In this embodiment of the application, the vehicle powertrain 100 further includes a controller.

[0049] The controller is connected to the first clutch 2 and the second clutch 3. When the start-up function or the power generation function is triggered, the controller controls the first clutch 2 to close and the second clutch 3 to open, so that the first motor 4 starts the engine 1, or the engine 1 drives the first motor 4 to generate electricity. When the drive function is triggered, the controller controls the first clutch 2 to open and the second clutch 3 to close, so that the first motor 4 drives the first drive shaft.

[0050] It is understood that, in the embodiments of this application, the opening and closing of the first clutch 2 and the second clutch 3 can be controlled by the controller to ensure the auxiliary drive of the first motor 4, and to realize the starting function, power generation function and driving function.

[0051] In the embodiments of this application, such as Figure 4 As shown, the vehicle powertrain 100 also includes a first reducer 5 and a first differential 6.

[0052] The first clutch 2 is mechanically connected to the first reducer 5, the first reducer 5 is mechanically connected to the first differential 6, and the first differential 6 is mechanically connected to the first drive shaft.

[0053] It is understood that in this embodiment of the application, the first reducer 5 is used to receive the deceleration signal transmitted by the first clutch 2, thereby reducing the speed and increasing the torque to achieve the ideal transmission effect, and the first differential 6 is used to change the direction of power transmission to adjust the speed difference between the front and rear wheels.

[0054] In the embodiments of this application, such as Figure 4 As shown, the vehicle power system 100 also includes: a second motor 10, a first power battery 8, and a second power battery 9.

[0055] The second motor 10 drives the second drive shaft; the first power battery 8 is used to store electrical energy in range-extending power generation or energy recovery mode, and to provide electrical energy to the first motor 4 when the drive function is triggered; the second power battery 9 is used to provide electrical energy to the second motor 10.

[0056] Among them, the first power battery 8 is a power type battery, and the second power battery 9 is an energy type battery.

[0057] It is understood that in the embodiments of this application, the first power battery 8 and the second power battery 9 provide electrical energy to the first motor 4 and the second motor 10 respectively, and adopt a hybrid structure of power type battery (first power battery 8) and energy type battery (second power battery 9). Compared with simply using power type battery, the cost is lower and the energy density is more advantageous.

[0058] It should be noted that the first power battery 8 is a power-type battery, preferably around 2 kWh, while the second power battery 9 is an energy-type battery, with the capacity determined according to the pure electric range positioning requirements of the vehicle model. The first power battery 8 does not support external charging, while the second power battery 9 does support external charging.

[0059] In the embodiments of this application, such as Figure 4 As shown, it also includes: a power distribution unit 7.

[0060] The power distribution unit 7 is electrically connected to the first motor 4, the second motor 10, the first power battery 8, and the second power battery 9.

[0061] It is understood that the power distribution unit 7 in this application embodiment is used to distribute the electrical energy of the first power battery 8 and the second power battery 9 to the first motor 4 and the second motor 10, in range-extended power generation mode and energy recovery mode, and to receive excess generated electrical energy and recovered electrical energy.

[0062] In the embodiments of this application, such as Figure 4 As shown, the vehicle powertrain 100 also includes a second reducer 11 and a second differential 12.

[0063] The second motor 10 is mechanically connected to the second reducer 11, the second reducer 11 is mechanically connected to the second differential 12, and the second differential 12 is mechanically connected to the first drive shaft.

[0064] It is understood that in this embodiment of the application, the second reducer 11 is used to receive the deceleration signal transmitted by the second motor 10, thereby reducing the speed and increasing the torque to achieve the ideal transmission effect, and the second differential 12 is used to change the direction of power transmission to adjust the speed difference between the front and rear wheels.

[0065] According to the vehicle power system proposed in the embodiments of this application, the first motor 4 is assisted in driving through the first clutch 2 and the second clutch 3, such as starting function, power generation function and driving function. By adding a range-extending auxiliary power unit to the electric vehicle, a multi-functional mode can be realized. The control logic is simple and four-wheel drive function can be realized at low cost.

[0066] The following will combine Figure 4 The automotive powertrain system is described in detail below. The first motor 4 in this application can be a drive-generator-start integrated motor (MG motor), and the second motor 10 can be a main drive motor (M motor). For ease of understanding, this application uses the drive-generator-start integrated motor (MG motor 4) and the main drive motor (M motor 10) as examples for detailed explanation. The specific connection relationships are as follows:

[0067] Engine 1 and the integrated generator-starter MG motor 4 are connected via a clutch. The integrated generator-starter MG motor 4 and the first reducer 5 are connected via a second clutch 3. The first reducer 5 is connected to the first differential 6. The integrated generator-starter MG motor 4 assists in driving the front wheels or realizes energy recovery. The integrated generator-starter MG motor 4 is connected to the first power battery 8, the second power battery 9, and the main drive M motor 10 via a high-voltage line through the power distribution unit 7. The main drive M motor 10 is connected to the second differential 12 through the second reducer 11, drives the rear wheels, and is connected to the integrated generator-starter MG motor 4, the first power battery 8, and the second power battery 9 via a high-voltage connection through PDU 7.

[0068] Among them, the MG motor 4, which drives the integrated generator and starter, is preferably a small-power, high-torque motor to assist in driving the front wheels and realize the four-wheel drive function; the first clutch 2 is preferably a normally closed clutch, and the second clutch 3 is preferably integrated with the first clutch 2 as a dual-clutch, or it can be separated from the first clutch 2 and formed as a separate component. In the case of separate components, a hydraulic coupling is preferred, which is beneficial to the smooth control of power when the four-wheel drive is engaged; the main drive M motor 10 is preferably a high-power motor, which is beneficial to high-speed power and high-speed energy consumption; the first power battery 8 is a power type battery, preferably around 2 kWh, and the second power battery 9 is an energy type battery, with the capacity determined according to the pure electric range positioning requirements of the vehicle model.

[0069] The following will combine Figures 5 to 15 The specific operating conditions of the automotive powertrain are described in detail below:

[0070] (1) Pure electric driving condition 1, such as Figure 5 As shown

[0071] The first power battery 8 supplies power to the main drive M motor 10 and drives the rear wheels. The preferred SOC of the first power battery 8 is 50%. When the SOC exceeds a certain threshold (which can be determined according to actual calibration), and when the power required by the main drive M motor 10 is not large, such as crawling or starting with a small throttle, the first power battery 8 supplies power to the main drive M motor 10 for driving.

[0072] (2) Pure electric driving condition 2, such as Figure 6 As shown

[0073] The second power battery 9 supplies power to the main drive M motor 10 and drives the rear wheels. When the first power battery 8 is below a certain threshold (which can be determined according to actual calibration) and the SOC of the second power battery 9 is above the minimum limit threshold, the second power battery 9 supplies power to the main drive M motor 10 for driving. This situation is also the main driving condition of this solution.

[0074] (3) Pure electric driving condition 3, such as Figure 7 As shown

[0075] The first power battery 8 and the second power battery 9 simultaneously supply power to the main drive motor 10 to drive the rear wheels. When the SOC of the first power battery 8 is higher than a certain threshold (which can be determined according to actual calibration) and the SOC of the second power battery 9 is higher than the minimum limit threshold, when the power required by the main drive motor 10 is large (exceeding the maximum power of the first power battery 8), such as high-power conditions like high-speed overtaking, the first power battery 8 and the second power battery 9 simultaneously supply power to the main drive motor 10 for driving.

[0076] (4) Pure electric four-wheel drive driving condition 4, such as Figure 8 As shown

[0077] The first power battery 8 supplies power to the MG motor 4, which drives the generator and starter integrated machine. The first clutch 2 is disengaged, the second clutch 3 is engaged, and the second power battery 9 supplies power to the main drive M motor 10, realizing the pure electric four-wheel drive function.

[0078] When the SOC of the first power battery 8 and the SOC of the second power battery 9 are higher than their respective minimum limit thresholds (which can be calibrated and determined), when four-wheel drive is required, such as when starting with high throttle, on low-friction surfaces, or on off-road surfaces, the first power battery 8 supplies power to the drive generator starter MG motor 4, while simultaneously disengaging the first clutch 2 and engaging the second clutch 3 to assist in driving the front wheels. The second power battery 9 supplies power to the main drive M motor 10 to drive the rear wheels, thus achieving pure electric four-wheel drive.

[0079] (5) Pure electric four-wheel drive driving condition 5, such as Figure 9 As shown

[0080] The second power battery 9 simultaneously supplies power to both the integrated generator-starter MG motor 4 and the main drive M motor 10, enabling pure electric four-wheel drive. When the SOC of the first power battery 8 is below the minimum limit threshold and the SOC of the power battery 2 is above the minimum limit threshold (which can be calibrated), when four-wheel drive is required, such as on low-friction surfaces or off-road surfaces, the second power battery 9 simultaneously supplies power to both the integrated generator-starter MG motor 4 and the main drive M motor 10, while simultaneously disengaging the first clutch 2 and engaging the second clutch 3. The integrated generator-starter MG motor 4 drives the front wheels, and the main drive M motor 10 drives the rear wheels, thus achieving pure electric four-wheel drive.

[0081] (6) Range-extended driving condition 1, such as Figure 10 As shown

[0082] Engine 1 drives the integrated generator-starter MG motor 4 to generate electricity, which powers the main drive M motor 10 for driving. When the SOC of the first power battery 8 and the second power battery 9 are lower than their respective certain thresholds (which can be calibrated and determined), engine 1 drives the integrated generator-starter MG motor 4 to generate electricity, which powers the main drive M motor 10 to drive the rear wheels. At this time, the amount of electricity generated is balanced with the amount of electricity required by the main drive M motor 10, such as in constant speed cruising conditions.

[0083] (7) Range-extending driving condition 2, such as Figure 11 As shown

[0084] Engine 1 drives the integrated generator-starter MG motor 4 to generate electricity, supplying power to the main drive M motor 10 for driving, and simultaneously charging the first power battery 8. When the state of charge (SOC) of the first power battery 8 and the state of charge (SOC) of the second power battery 9 are below a certain threshold (which can be calibrated and determined), engine 1 drives the integrated generator-starter MG motor 4 to generate electricity, supplying power to the main drive M motor 10 to drive the rear wheels. At the same time, the excess electricity generated is used to charge the first power battery 8. At this time, the power required by the main drive M motor 10 is less than the power generated by the integrated generator-starter MG motor, and the excess electricity is used to charge the first power battery 8, such as in low-speed driving conditions.

[0085] (8) Range-extending driving condition 3, such as Figure 12 As shown

[0086] Engine 1 drives the integrated generator-starter MG motor 4 to generate electricity, and the first power battery 8 simultaneously supplies power to the main drive M motor 10 for driving. When the state of charge (SOC) of the first power battery 8 is higher than the minimum limit threshold (which can be calibrated and determined), and the state of charge (SOC) of the second power battery 9 is lower than a certain threshold (which can be calibrated and determined), if the generated power is insufficient to meet the power demand of the M motor, the first power battery 8 supplements the main drive M motor 10 with a certain amount of power, such as in high-throttle overtaking acceleration conditions.

[0087] (9) Range-extending driving condition 4, such as Figure 13 As shown

[0088] Engine 1 drives the integrated generator-starter MG motor 4 to generate electricity, while the first power battery 8 and the second power battery 9 simultaneously supply power to the M motor for driving. When the state of charge (SOC) of the first power battery 8 and the state of charge (SOC) of the second power battery 9 exceed their respective minimum thresholds, and the power generated by the generator and the power provided by the first power battery 8 are insufficient to meet the power requirements of the main drive M motor 10, the second power battery 9 further supplements the main drive M motor 10 with a certain amount of power, such as during high-speed, high-throttle overtaking acceleration.

[0089] (10) Engine 1 starting condition, such as Figure 14 As shown

[0090] Before entering the range-extended operating mode, the first power battery 8 supplies power to the integrated generator and starter MG, starting the range-extended engine 1 and entering the range-extended operating mode.

[0091] (11) Idle power generation condition, such as Figure 15 As shown

[0092] Engine 1 drives the MG motor to generate electricity, which is used only for the vehicle's power consumption and to charge the first power battery 8. When both the first power battery 8 and the second power battery 9 are below their respective thresholds, such as when high-power vehicle electrical appliances such as the air conditioner are turned on at idle, the excess electricity generated is used to charge the first power battery 8, in addition to the electricity used for the vehicle's power consumption.

[0093] (12) Energy recovery operating conditions, such as Figure 16 As shown

[0094] During deceleration, the first clutch 2 is disengaged and the second clutch 3 is engaged. The front axle drives the integrated drive-generator-start motor MG 4 to generate electricity and charge the first power battery 8.

[0095] In summary, the main drive M motor 10 of this application is arranged on the second drive shaft, i.e., the rear axle, as the power source for common operating conditions. Depending on the actual situation, it obtains electrical energy from the first power battery 8, the second power battery 9, and the drive-generator-start integrated MG motor 4. A dual clutch is added to realize the auxiliary drive function of the drive-generator-start integrated MG motor. The drive-generator-start integrated MG motor 4 and the engine 1 are connected through the first clutch 2 to realize the starting and power generation functions. It is connected to the first reducer 5 through the second clutch 3. According to the needs of the whole vehicle, it provides auxiliary drive to the first drive shaft, i.e., the front axle, to realize the four-wheel drive function.

[0096] The power battery adopts a hybrid structure of small-capacity power type battery (first power battery 8) and large-capacity energy type battery (second power battery 9). The first power battery 8 meets the requirements of frequent charging and discharging, high-power discharge under low SOC (State of Charge, battery remaining power). When driving, it can supply power to the MG motor 4 and the main drive M motor 10 through PDU7 (Power Distribution Unit). In range-extending power generation mode and energy recovery mode, it receives excess generated power and recovered power, but does not support external charging. The second power battery 9 provides power to the main drive M motor 10 in driving mode and supports external fast and slow charging, but does not support charging of the MG motor 4 or energy recovery charging.

[0097] This application also provides a range-extended electric vehicle, including the vehicle powertrain system as described in the above embodiments.

[0098] Figure 17This is a flowchart illustrating a control method for an automotive powertrain system provided in an embodiment of this application.

[0099] like Figure 17 As shown, the control method for this vehicle powertrain includes the following steps:

[0100] In step S101, the current operating condition of the vehicle is detected.

[0101] It is understood that the current operating condition in the embodiments of this application can be the power generation condition, the engine starting condition, or the driving condition, without being specifically limited. The actual operating condition can be determined to facilitate subsequent control of the opening and closing of the first clutch and the second clutch.

[0102] In step S102, the starting function, power generation function, or driving function of the first motor is triggered according to the current working conditions. When the starting function or power generation function is triggered, the first clutch is controlled to close and the second clutch is controlled to disengage, and the first motor starts the engine, or the engine drives the first motor to generate electricity. When the driving function is triggered, the first clutch is controlled to disengage and the second clutch is controlled to close, and the first motor drives the first drive shaft.

[0103] It is understood that, according to the current operating conditions, the embodiments of this application trigger the starting function, power generation function or driving function of the first motor, and control the opening and closing of the first clutch and the second clutch to achieve the corresponding function.

[0104] According to the control method of the vehicle power system proposed in the embodiments of this application, the starting function, power generation function or driving function of the first motor is triggered according to the current actual working condition. If the current working condition is the starting or power generation function, the first clutch is controlled to close and the second clutch is controlled to open, and the first motor starts the engine or the engine drives the first motor to generate electricity. If the current working condition is the driving function, the first clutch is controlled to open and the second clutch is controlled to close, and the first motor drives the first drive shaft. By adding a range extender auxiliary power unit on the basis of electric vehicle, a multi-functional mode can be realized. The control logic is simple and four-wheel drive function can be realized at low cost.

[0105] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of this application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0106] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this application, "N" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0107] Any process or method described in the flowchart or otherwise herein can be understood as representing a module, segment, or portion of code comprising one or N executable instructions for implementing custom logic functions or processes, and the scope of the preferred embodiments of this application includes additional implementations in which functions may be performed not in the order shown or discussed, including substantially simultaneously or in reverse order depending on the functions involved, as should be understood by those skilled in the art to which embodiments of this application pertain.

[0108] It should be understood that the various parts of this application can be implemented using hardware, software, firmware, or a combination thereof. In the above embodiments, the N steps or methods can be implemented using software or firmware stored in memory and executed by a suitable instruction execution system. For example, if implemented in hardware, as in another embodiment, it can be implemented using any one or a combination of the following techniques known in the art: discrete logic circuits having logic gates for implementing logical functions on data signals, application-specific integrated circuits (ASICs) having suitable combinational logic gates, programmable gate arrays (FPGAs), field-programmable gate arrays (FPGAs), etc.

[0109] Those skilled in the art will understand that all or part of the steps of the methods in the above embodiments can be implemented by a program instructing related hardware. The program can be stored in a computer-readable storage medium, and when executed, the program includes one or a combination of the steps of the method embodiments.

[0110] Although embodiments of this application have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting this application. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of this application.

Claims

1. A vehicle powertrain system, characterized in that, include: The engine and the first motor, which integrates drive, power generation, and starting, are combined into one unit. A first clutch is disposed between the engine and the first motor; A second clutch is disposed between the first motor and the first drive shaft; wherein the first motor realizes the starting function, power generation function and driving function through the cooperation between the first clutch and the second clutch; It also includes: a second motor that drives the second drive shaft; a first power battery for storing electrical energy in range-extending power generation or energy recovery operation, and providing electrical energy to the first motor when the drive function is triggered; and a second power battery for providing electrical energy to the second motor. It also includes: a second reducer and a second differential, wherein the second motor is mechanically connected to the second reducer, the second reducer is mechanically connected to the second differential, and the second differential is mechanically connected to the first drive shaft; the first power battery does not support external charging, while the second power battery does support external charging; the second clutch and the first clutch are integrated into a dual-clutch system; the first motor is a low-power, high-torque motor that assists in driving the front wheels to achieve four-wheel drive; the second motor is a high-power motor; It also includes: a power distribution unit, which is electrically connected to the first motor, the second motor, the first power battery and the second power battery respectively; The first power battery is a small-capacity power battery, and the second power battery is a large-capacity energy battery. Under driving conditions, the first power battery supplies power to the first motor and the second motor through the power distribution unit. Under range-extending and energy recovery conditions, the first power battery receives excess generated and recovered energy and does not support external charging. Under driving conditions, the second power battery provides power to the second motor, supports external fast and slow charging, is not charged by the first motor, and is not charged under energy recovery conditions. When the state of charge of the first power battery and the state of charge of the second power battery are both higher than their respective minimum limit thresholds and four-wheel drive is required, the first power battery supplies power to the first motor, the first clutch is disengaged, the second clutch is engaged, the first motor assists in driving the front wheels, the second power battery supplies power to the second motor, and the second motor drives the rear wheels to achieve pure electric four-wheel drive. When the state of charge of the first power battery is below the minimum threshold and the state of charge of the second power battery is above the minimum threshold and four-wheel drive is required, the second power battery simultaneously supplies power to the first motor and the second motor. The first clutch is disengaged and the second clutch is engaged. The first motor drives the front wheels and the second motor drives the rear wheels to achieve pure electric four-wheel drive.

2. The automotive powertrain system according to claim 1, characterized in that, Also includes: The controller is connected to the first clutch and the second clutch. When the starting function or the power generation function is triggered, the controller controls the first clutch to close and the second clutch to disengage, so that the first motor starts the engine, or the engine drives the first motor to generate electricity. When the drive function is triggered, the first clutch is disengaged and the second clutch is engaged, and the first motor drives the first drive shaft.

3. The automotive powertrain system according to claim 1, characterized in that, Also includes: A first reducer and a first differential, wherein the first clutch is mechanically connected to the first reducer, the first reducer is mechanically connected to the first differential, and the first differential is mechanically connected to the first drive shaft.

4. The automotive powertrain system according to claim 1, characterized in that, The first power battery is a power type battery, and the second power battery is an energy type battery.

5. The automotive powertrain system according to any one of claims 1-4, characterized in that, The first clutch is a normally closed clutch, and the second clutch is a normally open clutch.

6. A range-extended electric vehicle, characterized in that, Including the automotive powertrain system as described in any one of claims 1-5.

7. A control method for an automotive powertrain system, characterized in that, The method is used for controlling an automotive powertrain system as described in any one of claims 1-5, wherein the method includes the following steps: Detect the current operating condition of the vehicle; The starting function, power generation function, or drive function of the first motor are triggered according to the current operating conditions, wherein, When the start-up function or the power generation function is triggered, the first clutch is controlled to close and the second clutch is controlled to disengage, and the first motor starts the engine, or the engine drives the first motor to generate electricity; when the drive function is triggered, the first clutch is controlled to disengage and the second clutch is controlled to close, and the first motor drives the first drive shaft.

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