A method, device, vehicle and storage medium for controlling mode switching

Abstract

The present application provides a method, device, vehicle and storage medium for controlling mode switching, which is applied to the field of vehicle technology, and includes: when it is determined that the vehicle needs to switch from a pure electric rear-drive mode to a pure electric four-wheel drive mode, controlling the second input shaft to engage in an even gear; if it is detected that the gear position of the second input shaft is neutral, determining that the even gear on the second input shaft is unavailable; when it is determined that the even gear on the second input shaft is unavailable, controlling the first input shaft to engage in an odd gear, controlling the second clutch and the first clutch to close, so that the vehicle switches to a pure electric four-wheel drive mode; when it is determined that the vehicle switches to a pure electric four-wheel drive mode, controlling the front drive motor of the vehicle to output torque to the front wheels of the vehicle through the second clutch, the first clutch and the first input shaft. This method can ensure that the vehicle can switch from a pure electric rear-drive mode to a pure electric four-wheel drive mode when the even gear is unavailable, thereby ensuring the power performance of the vehicle.

Description

Technical Field

[0001] The present application relates to the field of vehicles, and more specifically, to a method, device, vehicle and storage medium for controlling mode switching in the field of vehicles. Background Art

[0002] With the development of technology, hybrid vehicles are gradually occupying the market. Hybrid-structured vehicles include multiple operating modes, such as pure electric rear-wheel drive mode, pure electric four-wheel drive mode, direct drive mode and other modes. In the pure electric rear-wheel drive mode, the front drive motor of the vehicle does not output power, and the rear drive motor outputs power to the rear wheels of the vehicle to drive the vehicle. In the pure electric four-wheel drive mode, the front wheels of the vehicle output power, and the rear drive motor of the vehicle outputs power to the rear wheels of the vehicle to drive the vehicle.

[0003] In the prior art, when a vehicle switches from a pure electric rear-wheel drive mode to a pure electric four-wheel drive mode, it is usually necessary to control the odd-numbered axles to shift into gear and the even-numbered axles to shift into gear, so that the front-wheel drive motor of the vehicle can transmit the output torque to the front wheels of the vehicle through the even-numbered axles to drive the vehicle.

[0004] However, when the even-numbered axle fails to shift gears, the vehicle's front-wheel drive motor cannot transmit the output torque to the vehicle's front wheels through the even-numbered axle. At this time, the vehicle cannot switch to pure electric four-wheel drive mode, and the power output of the vehicle is difficult to meet user needs. Summary of the invention

[0005] The present application provides a method, device, vehicle and storage medium for controlling mode switching. The method can ensure that the vehicle can switch from a pure electric rear-wheel drive mode to a pure electric four-wheel drive mode when an even gear is unavailable, thereby ensuring the vehicle's power performance.

[0006] In a first aspect, a method for controlling mode switching is provided, which is applied to a hybrid vehicle, the vehicle comprising a hybrid transmission, the hybrid transmission comprising: a first input shaft and a second input shaft, the first input shaft being connected to a first clutch, the second input shaft being connected to a second clutch, the method comprising: when it is determined that the vehicle needs to switch from a pure electric rear-wheel drive mode to a pure electric four-wheel drive mode, controlling the second input shaft to shift into an even gear; if it is detected that the gear position of the second input shaft is neutral, determining that the even gear on the second input shaft is unavailable; when it is determined that the even gear on the second input shaft is unavailable, controlling the first input shaft to shift into an odd gear, and controlling both the second clutch and the first clutch to close, so that the vehicle switches to the pure electric four-wheel drive mode; when it is determined that the vehicle switches to the pure electric four-wheel drive mode, controlling the front-wheel drive motor of the vehicle to output torque to the front wheels of the vehicle through the second clutch, the first clutch and the first input shaft.

[0007] In the above technical solution, when the vehicle switches from the pure electric rear-wheel drive mode to the pure electric four-wheel drive mode, if it is determined that the even gear on the second input shaft is unavailable, the first input shaft is controlled to be engaged in the odd gear, and the first clutch and the second clutch are controlled to be closed, so that the front-wheel drive motor of the vehicle transmits power to the front wheels of the vehicle through the second clutch, the first clutch and the first input shaft, ensuring that the vehicle can switch from the pure electric rear-wheel drive mode to the pure electric four-wheel drive mode when the even gear is unavailable, ensuring that the power output of the vehicle meets user needs, improving the power performance of the vehicle, and improving the success rate of the vehicle switching to the pure electric four-wheel drive mode, avoiding the situation where the front-wheel drive motor cannot output power to the front wheels through the second input shaft due to the unavailability of the even gear of the second input shaft, resulting in the vehicle being unable to switch from the pure electric rear-wheel drive to the pure electric four-wheel drive mode.

[0008] In combination with the first aspect, in certain possible implementations, controlling both the second clutch and the first clutch to close includes: controlling the speed of the front-drive motor to be less than or equal to the target speed; when the actual speed of the front-drive motor is less than or equal to the target speed, first controlling the second clutch to close, and then controlling the first clutch to close.

[0009] In the above technical solution, by controlling the front drive motor speed to be lower than or equal to the target speed, the speed difference between the two ends of the second clutch can be reduced, thereby reducing the mechanical shock and vibration generated when closing the second clutch, improving the driving experience, and reducing damage to the clutch. Controlling the closing of the second clutch first and then controlling the closing of the first clutch can avoid the redundant operation of closing the first clutch when the second clutch cannot be closed, thereby improving the accuracy and efficiency of controlling the closing of the clutch.

[0010] In combination with the first aspect and the above-mentioned implementation methods, in certain possible implementation methods, after controlling the front-drive motor of the vehicle to output torque to the front wheels of the vehicle through the second clutch, the first clutch and the first input shaft, the method also includes: when it is determined that the vehicle needs to switch from the pure electric four-wheel drive mode to the direct drive mode, controlling the first clutch to open; when it is determined that the first clutch is in an open state and the second clutch is in a closed state, controlling the vehicle's engine ignition to start the engine; when it is determined that the engine has started successfully, controlling the first clutch to close so that the vehicle switches to the direct drive mode.

[0011] In the above technical scheme, in the pure electric four-wheel drive mode when the even gears are unavailable and the first clutch and the second clutch are both closed, the first clutch is controlled to open, the engine is ignited to start the engine, and after the engine is successfully started, the first clutch is controlled to close. This enables the vehicle to start the engine in the pure electric four-wheel drive mode when the even gears are unavailable and the first clutch and the second clutch are both closed, thereby ensuring the vehicle's switching from the pure electric four-wheel drive mode to the direct drive mode and improving the success rate of the vehicle mode switching.

[0012] In combination with the first aspect and the above-mentioned implementation methods, in some possible implementation methods, when it is determined that the vehicle needs to switch from the pure electric four-wheel drive mode to the direct drive mode, the first clutch is controlled to open, including: when it is determined that the vehicle needs to switch from the pure electric four-wheel drive mode to the direct drive mode, the front drive motor is controlled to reduce the torque; when it is determined that the actual torque of the front drive motor is lower than the target torque, the first clutch is controlled to open.

[0013] In the above technical solution, by controlling the actual torque of the front-drive motor to drop below the target torque and then controlling the first clutch to open, the inertia of the front-drive motor after the first clutch is opened is reduced, the front-drive motor is avoided from spinning, the damage to the front-drive motor is reduced, and the stability of the vehicle during mode switching is improved.

[0014] In combination with the first aspect and the above-mentioned implementation methods, in certain possible implementation methods, when it is determined that the first clutch is in an open state and the second clutch is in a closed state, the vehicle's engine ignition is controlled to start the engine, including: when it is determined that the first clutch is in an open state and the second clutch is in a closed state, judging whether the actual speed of the engine is greater than or equal to the preset speed; when it is determined that the actual speed is greater than or equal to the preset speed, controlling the engine ignition to start the engine.

[0015] In the above technical solution, since the front-drive motor itself will drive the engine to rotate in the pure electric four-wheel drive mode, after the first clutch is opened, it is first determined whether the engine speed has reached the preset ignition speed. When it is determined whether the engine speed has reached the preset ignition speed, the engine ignition is directly controlled to start the engine. The speed of the front-drive motor to drive the engine to rotate in the pure electric four-wheel drive mode when the even-numbered shaft is unavailable is reasonably utilized, thereby shortening the engine starting time.

[0016] In combination with the first aspect and the above-mentioned implementation methods, in some possible implementation methods, the method also includes: when it is determined that the actual speed is less than the preset speed, controlling the front drive motor to output torque through the second clutch to drag the engine to rotate until the actual speed of the engine is greater than or equal to the preset speed, controlling the engine ignition to start the engine.

[0017] In the above technical solution, when it is determined that the actual speed of the engine is lower than the preset speed, the closed second clutch is used to control the front-drive motor to output torque to drag the engine to rotate, so that the actual speed of the engine can quickly reach the preset speed, ensuring stable ignition of the engine and improving the success rate of engine starting.

[0018] In combination with the first aspect and the above-mentioned implementation methods, in certain possible implementation methods, when it is determined that the engine has been started successfully, the first clutch is controlled to close so that the vehicle switches to the direct drive mode, including: when it is determined that the engine has been started successfully, the rotational speed of the first input shaft is obtained; according to the rotational speed of the first input shaft, the rotational speed of the front-drive motor is adjusted to reduce the speed difference between the two ends of the first clutch; when the speed difference between the two ends of the first clutch is less than the preset speed difference, the first clutch is controlled to close so that the vehicle switches to the direct drive mode.

[0019] In the above technical solution, after the engine is successfully started, the speed of the front-drive motor is adjusted based on the speed of the first input shaft connected to one end of the first clutch. The front-drive motor can drive the speed of the other end of the first clutch through the second clutch to reduce the speed difference between the two ends of the first clutch, thereby ensuring the safe and smooth closing of the first clutch and avoiding impact or vibration when the first clutch is closed, thereby improving driving comfort and vehicle stability.

[0020] In summary, in the present application, when the vehicle switches from the pure electric rear-drive mode to the pure electric four-wheel drive mode, if it is determined that the even gear on the second input shaft is unavailable, the first input shaft is controlled to be engaged in the odd gear, and the first clutch and the second clutch are controlled to be closed, so that the front-drive motor of the vehicle can transmit power to the front wheels of the vehicle through the second clutch, the first clutch and the first input shaft, ensuring that the vehicle can switch from the pure electric rear-drive mode to the pure electric four-wheel drive mode when the even gear is unavailable, ensuring that the power output of the vehicle meets the needs of users, improving the power performance of the vehicle, and improving the success rate of the vehicle switching to the pure electric four-wheel drive mode. Controlling the closing of the second clutch first and then controlling the closing of the first clutch can avoid the redundant operation of closing the first clutch when the second clutch cannot be closed. In the pure electric four-wheel drive mode when the even gears are unavailable and the first clutch and the second clutch are both closed, the first clutch is controlled to open and the engine is ignited to start the engine. After the engine starts successfully, the first clutch is controlled to close. This enables the vehicle to start the engine in the pure electric four-wheel drive mode when the even gears are unavailable and the first clutch and the second clutch are both closed, ensuring the vehicle's switching from the pure electric four-wheel drive mode to the direct drive mode and improving the success rate of the vehicle's mode switching.

[0021] In a second aspect, a control module switching device is provided, which is applied to a hybrid vehicle, the vehicle includes a hybrid transmission, the hybrid transmission includes: a first input shaft and a second input shaft, the first input shaft is connected to a first clutch, and the second input shaft is connected to a second clutch, the device includes: a first control module, which is used to control the second input shaft to engage in an even gear when it is determined that the vehicle needs to switch from a pure electric rear-wheel drive mode to a pure electric four-wheel drive mode; a determination module, which is used to determine that the even gear on the second input shaft is unavailable if it is detected that the gear position of the second input shaft is neutral; a second control module, which is used to control the first input shaft to engage in an odd gear when it is determined that the even gear on the second input shaft is unavailable, and control both the second clutch and the first clutch to close, so that the vehicle switches to the pure electric four-wheel drive mode; a third control module, which is used to control the front-wheel drive motor of the vehicle to output torque to the front wheels of the vehicle through the second clutch, the first clutch and the first input shaft when it is determined that the vehicle switches to the pure electric four-wheel drive mode.

[0022] In combination with the second aspect, in certain possible implementations, the second control module is specifically used to, when it is determined that the even gear on the second input shaft is unavailable, control the speed of the front-drive motor to be less than or equal to the target speed; when the actual speed of the front-drive motor is less than or equal to the target speed, first control the second clutch to close, and then control the first clutch to close.

[0023] In combination with the second aspect and the above-mentioned implementation methods, in some possible implementation methods, the device also includes: a fourth control module, which is used to control the first clutch to open when it is determined that the vehicle needs to switch from the pure electric four-wheel drive mode to the direct drive mode; a fifth control module, which is used to control the vehicle's engine ignition to start the engine when it is determined that the first clutch is in an open state and the second clutch is in a closed state; a sixth control module, which is used to control the first clutch to close when it is determined that the engine start is successful, so that the vehicle switches to the direct drive mode.

[0024] In combination with the second aspect and the above-mentioned implementation methods, in some possible implementation methods, the fourth control module is specifically used to control the front-drive motor to reduce torque when it is determined that the vehicle needs to switch from a pure electric four-wheel drive mode to a direct drive mode; and to control the first clutch to open when it is determined that the actual torque of the front-drive motor is lower than the target torque.

[0025] In combination with the second aspect and the above-mentioned implementation methods, in some possible implementation methods, the fifth control module is specifically used to determine whether the actual speed of the engine is greater than or equal to the preset speed when it is determined that the first clutch is in an open state and the second clutch is in a closed state; when it is determined that the actual speed is greater than or equal to the preset speed, control the engine ignition to start the engine.

[0026] In combination with the second aspect and the above-mentioned implementation methods, in some possible implementation methods, the fifth control module is specifically used to, when it is determined that the actual speed is less than the preset speed, control the front-drive motor to output torque through the second clutch to drag the engine to rotate until the actual speed of the engine is greater than or equal to the preset speed, and control the engine ignition to start the engine.

[0027] In combination with the second aspect and the above-mentioned implementation methods, in some possible implementation methods, the sixth control module is specifically used to, when it is determined that the engine has been started successfully, obtain the rotational speed of the first input shaft; adjust the rotational speed of the front-drive motor according to the rotational speed of the first input shaft to reduce the speed difference at both ends of the first clutch; when the speed difference at both ends of the first clutch is less than the preset speed difference, control the first clutch to close so that the vehicle switches to direct drive mode.

[0028] In a third aspect, a vehicle is provided, comprising a memory and a processor. The memory is used to store executable program code, and the processor is used to call and run the executable program code from the memory, so that the vehicle executes the method in the first aspect or any possible implementation of the first aspect.

[0029] In a fourth aspect, a computer program product is provided, comprising: a computer program code, which, when executed on a computer, enables the computer to execute the method in the first aspect or any possible implementation of the first aspect.

[0030] In a fifth aspect, a computer-readable storage medium is provided, which stores a computer program code. When the computer program code runs on a computer, the computer executes the method in the above-mentioned first aspect or any possible implementation manner of the first aspect. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 It is a schematic diagram of the architecture of a hybrid vehicle provided in an embodiment of the present application.

[0032] Figure 2 It is a flowchart of a method for controlling mode switching provided in an embodiment of the present application.

[0033] Figure 3 It is a structural schematic diagram of a control mode switching device provided in an embodiment of the present application.

[0034] Figure 4 It is a structural schematic diagram of a vehicle provided in an embodiment of the present application. DETAILED DESCRIPTION

[0035] The technical solution in the present application will be described clearly and in detail below in conjunction with the accompanying drawings. In the description of the embodiments of the present application, unless otherwise specified, " / " means or, for example, A / B can mean A or B: "and / or" in the text is only a description of the association relationship of associated objects, indicating that there can be three relationships, for example, A and / or B can mean: A exists alone, A and B exist at the same time, and B exists alone. In addition, in the description of the embodiments of the present application, "multiple" means two or more than two.

[0036] In the following, the terms "first" and "second" are used for descriptive purposes only and are not to be understood as suggesting or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features.

[0037] Figure 1 It is a schematic diagram of the architecture of a hybrid vehicle provided in an embodiment of the present application.

[0038] For example, Figure 1 As shown, the hybrid vehicle includes: a first motor 101 , a first motor controller 102 , a hybrid transmission 103 , an engine 104 , a high-voltage battery 105 , a second motor 106 , front wheels 107 , rear wheels 108 and a differential 109 .

[0039] The first motor 101 is also called a front drive motor or a P2.5 motor. The first motor 101 drives the front wheels 107 of the vehicle through the hybrid transmission 103 or works as a generator.

[0040] The first motor controller 102 is used to control the speed, torque and direction of the first motor 101. Specifically, by adjusting the current and voltage of the first motor 101, the speed of the first motor 101 is accurately controlled to ensure that the first motor 101 operates within the optimal speed range under different working conditions. According to the needs of the vehicle, the output torque of the first motor 101 is accurately controlled to ensure that the vehicle obtains sufficient driving force under acceleration, climbing, etc. By controlling the rotation direction of the first motor 101, it is ensured that the first motor 101 can rotate forward or reverse when needed.

[0041] The hybrid transmission 103 is a 4-speed transmission, including 4 forward gears, namely 1st gear, 2nd gear, 3rd gear and 4th gear. The hybrid transmission specifically includes: a K1 clutch 1031 , a K2 clutch 1032 , a first input shaft 1033 , a second input shaft 1034 , a first synchronizer 1035 , and a second synchronizer 1036 .

[0042] The K1 clutch 1031 and the K2 clutch 1032 are used to connect or disconnect the mechanical connection between the engine 104 and the input shaft of the hybrid transmission 103, and the input shaft of the hybrid transmission is the first input shaft 1033 and the second input shaft 1034. Specifically, the K1 clutch 1031 is connected to the first input shaft 1033. When the K1 clutch 1031 is in an open state, the engine 104 and the first input shaft 1033 are disconnected. When the K1 clutch 1031 is in a closed state, the engine 104 and the first input shaft 1033 are connected. The K2 clutch 1032 is connected to the second input shaft 1034. When the K2 clutch 1032 is in an open state, the engine 104 and the second input shaft 1034 are disconnected. When the K2 clutch 1032 is in a closed state, the engine 104 and the second input shaft 1034 are connected.

[0043] The first input shaft 1033 is also called an odd-numbered shaft, including odd-numbered gears: 1st gear and 3rd gear. The first synchronizer 1035 is used to select the 1st gear or 3rd gear on the first input shaft 1033, so that the engine 104 transmits the power corresponding to the 1st gear or 3rd gear. The second input shaft 1034 is also called an even-numbered shaft, including even-numbered gears: 2nd gear and 4th gear. The second synchronizer 1036 is used to select the 2nd gear or 4th gear on the second input shaft 1034, so that the engine 104 transmits the power corresponding to the 2nd gear or 4th gear.

[0044] The first motor 101 is also connected to the second input shaft 1034 of the hybrid transmission 103 , and the K2 clutch 1032 is also used to connect or disconnect the engine 104 from the first motor 101 .

[0045] The engine 104 is one of the power sources of the vehicle, and generates power by burning fuel (such as gasoline or diesel). The power generated by the engine 104 is transmitted to the hybrid transmission 103 through the clutch, and finally drives the front wheels 107 of the vehicle.

[0046] The high-voltage battery 105 is used to supply power to the second motor 106 and the first motor 101 , so that the second motor 106 and the first motor 101 output torque to drive the vehicle.

[0047] The second motor 106 is a rear-drive motor or a P4 motor. When the second motor 106 is running, it transmits power to the rear wheels 108 of the vehicle to drive the vehicle.

[0048] The differential 109 is used to allow the left and right wheels to rotate at different speeds when the vehicle turns. Through the differential 109, the outer wheels can rotate at a faster speed, and the inner wheels can rotate at a slower speed, ensuring that the vehicle turns smoothly.

[0049] In the pure electric rear-drive mode, the engine 104 and the first motor 101 are both in a stopped state, the K1 clutch 1031 and the K2 clutch 1032 are both in an open state, and the first input shaft 1033 and the second input shaft 1034 are both in neutral. The second motor 106 is in a running state, transmitting power to the rear wheels 108 of the vehicle to drive the vehicle.

[0050] In the pure electric four-wheel drive mode, the engine 104 is in a stopped state, the first motor 101 is in a running state, the K1 clutch 1031 and the K2 clutch 1032 are both in an open state, the first input shaft 1033 is in 1st gear or 3rd gear, and the second input shaft 1034 is in 2nd gear or 4th gear. The first motor 101 transmits power to the front wheels 107 of the vehicle through the second input shaft 1034, and the second motor 106 is in a running state, transmitting power to the rear wheels 108 of the vehicle to drive the vehicle.

[0051] In direct drive mode, the engine 104 and the motor drive the vehicle together. Specifically, the second motor 106 and the engine 104 are both in a driving state, the second motor 106 is used to drive the rear wheels 108, and the engine 104 is used to drive the front wheels 107. The state of the first motor 101 is related to the current vehicle speed, which is described below:

[0052] In direct drive mode, if the current vehicle speed is less than or equal to the creeping speed, the first motor 101 is in a non-operating state. The non-operating state can be understood as a 0 torque state, that is, the first motor 101 does not output torque. In the non-operating state, the first motor 101 neither participates in the driving of the front wheels 107 nor charges the high-voltage battery 105. In direct drive mode, if the current vehicle speed is greater than the creeping speed, the first motor 101 is in a power generation state or a driving state. When the first motor 101 is in a power generation state, the first motor 101 is used to charge the high-voltage battery 105. When the first motor 101 is in a driving state, the engine 104 and the first motor 101 are used to drive the front wheels 107 together.

[0053] Specifically, the output torque of the engine 104 may be compared with the required torque of the front wheels 107 to determine whether the first motor 101 is in a power generation state or a driving state.

[0054] If the output torque of the engine 104 is greater than the required torque of the front wheels 107, it means that the output torque of the engine 104 can not only meet the required torque of the front wheels 107 but also has excess torque. At this time, the output torque of the engine 104 can be divided into driving torque and charging torque. The driving torque is equal to the required torque of the front wheels, and the driving torque is used to drive the front wheels 107. The charging torque is equal to the torque difference between the output torque of the engine 104 and the driving torque, that is, the excess torque. The charging torque is used to provide to the first motor 101, so that the high-voltage battery 105 can be charged through the first motor 101. At this time, the first motor 101 is in a power generation state.

[0055] If the output torque of the engine 104 is less than the required torque of the front wheels 107, it means that the output torque of the engine 104 cannot meet the required torque of the front wheels 107, and the first motor 101 needs to assist. At this time, the torque difference between the required torque of the front wheels 107 and the output torque of the engine 104 can be determined as the assist torque of the first motor 101 so that the first motor 101 drives the front wheels 107 together with the engine 104 by outputting the assist torque. At this time, the first motor 101 is in a driving state.

[0056] If the output torque of the engine 104 is equal to the required torque of the front wheels 107, it means that the output torque of the engine 104 can just meet the required torque of the front wheels 107. At this time, the first motor 104 does not need to assist or generate electricity, that is, the first motor 101 can be in a non-working state.

[0057] In the prior art, Figure 1 When a hybrid vehicle of the shown architecture switches from pure electric rear-wheel drive mode to pure electric four-wheel drive mode, it is usually necessary to control the first input shaft to shift into an odd gear and the second input shaft to shift into an even gear, so that the vehicle's front-wheel drive motor can transmit the output torque to the vehicle's front wheels through the second input shaft to drive the vehicle.

[0058] However, when the second input shaft fails to shift into an even-numbered gear, the vehicle's front-wheel drive motor cannot transmit the output torque to the vehicle's front wheels through the even-numbered shaft. At this time, the vehicle cannot switch to pure electric four-wheel drive mode, and the power output of the vehicle is difficult to meet user needs.

[0059] Based on this, the present application proposes a method for control mode switching, by controlling the closing of the first clutch and the second clutch when it is determined that the second input shaft fails to shift into an even gear, so that the front drive motor of the vehicle outputs power to the front wheels of the vehicle through the second clutch, the first clutch and the odd-numbered shaft, so that the vehicle can switch to a pure electric four-wheel drive mode, ensuring that the power output of the vehicle can meet user needs.

[0060] Figure 2is a flow chart of a method for controlling mode switching provided in an embodiment of the present application. The method is applied to include Figure 1 The vehicle includes a hybrid transmission 103, which includes a first input shaft 1033 and a second input shaft 1034, wherein the first input shaft 1033 is connected to a first clutch, and the second input shaft is connected to a second clutch. Figure 1 The K1 clutch 1031 in the second clutch is Figure 1 K2 clutch 1032 in.

[0061] For example, Figure 2 As shown, the method 200 includes:

[0062] Step 201, when it is determined that the vehicle needs to switch from the pure electric rear-wheel drive mode to the pure electric four-wheel drive mode, control the second input shaft to engage in an even-numbered gear;

[0063] Step 202, if it is detected that the gear position of the second input shaft is neutral, then determining that the even-numbered gear on the second input shaft is unavailable;

[0064] Step 203, when it is determined that the even-numbered gear on the second input shaft is unavailable, control the first input shaft to be engaged in the odd-numbered gear, and control both the second clutch and the first clutch to be engaged;

[0065] Step 204, when it is determined that the vehicle is switched to the pure electric four-wheel drive mode, the front drive motor of the vehicle is controlled to output torque to the front wheels of the vehicle through the second clutch, the first clutch and the first input shaft.

[0066] exist Figure 2 In the shown embodiment, when the vehicle switches from the pure electric rear-wheel drive mode to the pure electric four-wheel drive mode, if it is determined that the even gear on the second input shaft is unavailable, the first input shaft is controlled to be engaged in the odd gear, and the first clutch and the second clutch are controlled to be closed, so that the front-wheel drive motor of the vehicle transmits power to the front wheels of the vehicle through the second clutch, the first clutch and the first input shaft, ensuring that the vehicle can switch from the pure electric rear-wheel drive mode to the pure electric four-wheel drive mode when the even gear is unavailable, ensuring that the power output of the vehicle meets user needs, improving the power performance of the vehicle, and improving the success rate of the vehicle switching to the pure electric four-wheel drive mode, avoiding the situation where the front-wheel drive motor cannot output power to the front wheels through the second input shaft due to the unavailability of the even gear of the second input shaft, resulting in the vehicle being unable to switch from the pure electric rear-wheel drive to the pure electric four-wheel drive mode.

[0067] Below Figure 2 The specific implementation of each step in the embodiment shown is described in detail:

[0068] In step 201, the even-numbered gears include the 2nd gear and the 4th gear. Controlling the second input shaft to be engaged in the even-numbered gear means controlling the second input shaft to be engaged in the 2nd gear or the 4th gear. Specifically, by Figure 1 The second synchronizer 1036 shown controls the second input shaft 1034 to shift into 2nd gear or 4th gear.

[0069] Determining that the vehicle needs to switch from pure electric rear-wheel drive mode to pure electric four-wheel drive mode means that the current actual operation mode of the vehicle is determined to be pure electric rear-wheel drive mode, and the target operation mode of the vehicle is pure electric four-wheel drive mode. In pure electric rear-wheel drive mode, the first input shaft and the second input shaft of the vehicle are both in neutral gear. In pure electric four-wheel drive mode, the second input shaft of the vehicle is in an even gear, and the first input shaft is usually in neutral gear. Therefore, when it is determined that the vehicle needs to switch from pure electric rear-wheel drive mode to pure electric four-wheel drive mode, it is necessary to control the second input shaft to be in an even gear, 2nd gear or 4th gear.

[0070] The user can send a switching instruction with a target operating mode to the vehicle to make the vehicle switch the operating mode. For example, the user can send a switching instruction with a target operating mode to the pure electric four-wheel drive mode to the vehicle when the vehicle's actual operating mode is the pure electric rear-wheel drive mode. After receiving the switching instruction, the vehicle determines that the vehicle needs to switch from the pure electric rear-wheel drive mode to the pure electric four-wheel drive mode.

[0071] In some embodiments, the vehicle may also automatically trigger mode switching in certain scenarios. For example, in pure electric rear-wheel drive mode, when the power of the vehicle's high-voltage battery is greater than a preset threshold, if the vehicle is in a scenario requiring greater power output, such as sand, mud, snow, etc., it can be determined that the vehicle currently needs to switch from pure electric rear-wheel drive mode to pure electric four-wheel drive mode.

[0072] In some embodiments, the scenario in which the vehicle switches from the pure electric rear-wheel drive mode to the pure electric four-wheel drive mode may also be a scenario in which the vehicle needs greater power to start. When the scenario is a scenario in which greater power is needed to start, the power of the vehicle starting can be improved by controlling the following steps of this case.

[0073] In step 202, after the second input shaft is controlled to shift to the 2nd gear or the 4th gear, the actual gear position of the second input shaft can be monitored. When it is detected that the actual gear position of the second input shaft is still neutral, it is determined that the even gear (i.e., the 2nd gear or the 4th gear) on the second input shaft is unavailable.

[0074] Specifically, when the vehicle switches from the pure electric rear-wheel drive mode to the pure electric four-wheel drive mode, the vehicle generally has a certain current speed, and the specific gear to be engaged by the second input shaft can be determined based on the current speed of the vehicle. When the current speed of the vehicle is less than or equal to a certain speed threshold, it can be determined that the second input shaft needs to be controlled to engage in the second gear. When the current speed of the vehicle is greater than a certain speed threshold, it can be determined that the second input shaft needs to be controlled to engage in the fourth gear.

[0075] For example, the vehicle speed threshold is 60 km / h, the current vehicle speed is 0 (i.e., the vehicle is in a starting state), and the current vehicle speed is less than the vehicle speed threshold, so it can be determined that the vehicle needs to control the second input shaft to shift into the 2nd gear. If after the second input shaft is controlled to shift into the 2nd gear, it is monitored that the actual gear position of the second input shaft is still neutral, it can be determined that the even-numbered gears of the second input shaft are unavailable.

[0076] In step 203, when it is determined that the even gear of the second input shaft 1034 is unavailable, it can be determined that the front drive motor of the vehicle, i.e. Figure 1 The first motor 101 in the vehicle cannot transmit power to the front wheels 107 of the vehicle through the second input shaft 1034. At this time, it is necessary to control the first input shaft to be engaged in an odd gear, and control the second clutch and the first clutch to be closed. When it is determined that the first clutch and the second clutch are both closed, it can be determined that the vehicle has switched from the pure electric rear-wheel drive mode to the pure electric four-wheel drive mode.

[0077] Among them, the odd gears include the 1st gear and the 3rd gear, and controlling the first input shaft to be engaged in the odd gears is controlling the first input shaft to be engaged in the 1st gear or the 3rd gear. Figure 1 The first synchronizer 1035 shown controls the first input shaft 1033 to shift into the 1st gear or the 3rd gear.

[0078] In some embodiments, the specific gear to be engaged by the first input shaft may also be determined based on the current speed of the vehicle. For example, when the current speed of the vehicle is less than or equal to a certain speed threshold, it may be determined that the first input shaft needs to be controlled to engage in the first gear. When the current speed of the vehicle is greater than a certain speed threshold, it may be determined that the first input shaft needs to be controlled to engage in the third gear.

[0079] It is understandable that, although the second clutch and the first clutch are not closed in the general pure electric four-wheel drive mode, in this case, because the even gear is not available, the front drive motor cannot transmit the output torque to the front wheels of the vehicle through the second input shaft, so the first input shaft is controlled to be engaged in the odd gear and the second clutch and the first clutch are closed. In addition, after the first clutch and the second clutch are closed in this application, the engine is not started, and the vehicle still uses the high-voltage battery to power the front drive motor and the rear drive motor so that the front drive motor and the rear drive motor drive the front and rear wheels of the vehicle, thereby driving the vehicle. Therefore, in this case, when the first clutch and the second clutch are both closed, it can also be determined that the vehicle has switched from the pure electric rear drive mode to the pure electric four-wheel drive mode.

[0080] Controlling both the second clutch and the first clutch to close includes three methods: controlling the first clutch to close first and then controlling the second clutch to close, controlling the first clutch and the second clutch to close simultaneously, and controlling the second clutch to close first and then controlling the first clutch to close.

[0081] In one possible implementation, controlling the second clutch and the first clutch to close includes: controlling the speed of the front-drive motor to be less than or equal to the target speed; when the actual speed of the front-drive motor is less than or equal to the target speed, first controlling the second clutch to close, and then controlling the first clutch to close.

[0082] When it is determined that the even gear on the second input shaft is unavailable, it can be determined that the vehicle currently needs to control the first clutch and the second clutch to close in order to switch the vehicle from the pure electric rear-wheel drive mode to the pure electric four-wheel drive mode.

[0083] The target speed is a speed that makes the speed difference between the two ends of the second clutch less than a certain speed threshold, so as to achieve the speed of safely closing the second clutch. Figure 1 The two ends of the second clutch K2 are the engine and the front drive motor respectively. When the vehicle is in pure electric rear drive mode, the engine is in a stopped state, that is, the speed of one end of the second clutch is 0 rpm (revolutions per minute). At this time, the target speed can be determined to be 0 rpm, and the actual speed of the front drive motor needs to be controlled to be equal to the target speed 0 rpm.

[0084] In some embodiments, a speed threshold slightly greater than 0 rpm may also be determined as the target speed. For example, based on a speed threshold of 2 rpm, the target speed is determined to be 2 rpm. At this time, the actual speed of the front drive motor may be controlled to be less than the target speed of 2 rpm.

[0085] After the speed of the front drive motor is controlled to be equal to the target speed of 0rpm or less than the target speed of 2rpm, the second clutch can be controlled to close. The vehicle first controls the second clutch to close, and then controls the first clutch to close after confirming that the second clutch is closed, so that the vehicle switches from the pure electric rear drive mode to the pure electric four-wheel drive mode.

[0086] It can be understood that the power output by the front-drive motor is transmitted to the first clutch through the second clutch. Closing the second clutch first can avoid the redundant operation of closing the first clutch when the second clutch cannot be closed. When the second clutch cannot be closed, it can be determined that power cannot be transmitted, and the first clutch does not need to be closed at this time.

[0087] In some embodiments, Figure 1The control unit in the hybrid vehicle shown may include: a hybrid transmission controller (Transmission Control Unit, TCU), a vehicle controller (Hybrid Control Unit, HCU), an EMS (Engine Management System), and a FMCU (Front Motor Control Unit). The execution subject of the control method may be a control unit in the vehicle, such as the above-mentioned HCU or TCU or EMS or FMCU.

[0088] Specifically, when it is determined that the vehicle fails to engage the even-numbered shaft (i.e., the second input shaft) in a scenario where the target mode is the pure electric four-wheel drive mode, the actual operation mode is the pure electric rear-wheel drive mode, and the target even-numbered gear is the 2nd or 4th gear, the TCU sends a signal to the HCU that the even-numbered shaft gear is unavailable, and the TCU controls the synchronizer 2 to be in neutral, and controls the speed of the front-wheel drive motor to the target speed of 0rpm. When the HCU receives the signal from the TCU that the even-numbered shaft gear is unavailable and determines that the actual speed of the front-wheel drive motor is equal to 0rpm, the HCU sends the even-numbered shaft neutral signal to the TCU, sends the K2 clutch closing command, and sends the K1 clutch closing command. When the TCU receives the K2 clutch closing command and the K1 clutch closing command sent by the HCU, it first controls the K2 clutch to close, and then controls the K1 clutch to close, and sends a signal to the HCU that the actual states of the K1 clutch and the K2 clutch are both in the closed state. When the HCU detects that both the K2 clutch and the K1 clutch are closed, the actual operation mode of the vehicle is set to the pure electric four-wheel drive mode.

[0089] In the above method, by controlling the front drive motor speed to be lower than or equal to the target speed, the speed difference between the two ends of the second clutch can be reduced, thereby reducing the mechanical shock and vibration generated when closing the second clutch, improving the driving experience, and reducing clutch damage. Controlling the closing of the second clutch first and then controlling the closing of the first clutch can avoid redundant operations of closing the first clutch when the second clutch cannot be closed, thereby improving the accuracy and efficiency of controlling the closing of the clutch.

[0090] In step 204, after the vehicle switches from the pure electric rear-wheel drive mode to the pure electric four-wheel drive mode, it can start to control the output torque of the front-wheel drive motor. The torque output by the front-wheel drive motor is transmitted to the front wheels of the vehicle through the second clutch, the first clutch and the first input shaft. When the even-numbered shaft gear is unavailable, the torque output by the front-wheel drive motor is transmitted to the front wheels of the vehicle through the first input shaft to drive the vehicle.

[0091] Specifically, when the HCU sets the actual operating mode of the vehicle to the pure electric four-wheel drive mode, the HCU starts to control the output torque of the front motor.

[0092] It can be understood that the front-drive motor is connected to the second clutch, the second clutch is connected to the first clutch, and the first clutch is connected to the first input shaft. After the second clutch and the first clutch are closed, the front-drive motor can first transmit power to the second clutch, then from the second clutch to the first clutch, and then from the first clutch to the first input shaft, and the first input shaft outputs power to the front wheels of the vehicle according to the currently engaged odd gear.

[0093] In a possible implementation, after controlling the front drive motor of the vehicle to output torque to the front wheels of the vehicle through the second clutch, the first clutch and the first input shaft, the method further includes the following S11 to S13:

[0094] S11, when it is determined that the vehicle needs to switch from the pure electric four-wheel drive mode to the direct drive mode, control the first clutch to open.

[0095] It can be understood that in the pure electric four-wheel drive mode, the vehicle's engine is in a stopped state, and in the direct drive mode, the vehicle's engine is in a running state. When it is determined that the vehicle needs to switch from the pure electric four-wheel drive mode to the direct drive mode, it can be determined that the vehicle's engine needs to be controlled to start.

[0096] In the above-mentioned pure electric four-wheel drive mode, the vehicle's even gears are unavailable, the second input shaft is in neutral, the first input shaft is in odd gears, and the second clutch and the first clutch are both in a closed state. When the first input shaft is in an odd gear and the first clutch is in a closed state, the engine is connected to the front wheels of the vehicle through the first clutch and the odd gear of the first input shaft. At this time, if the engine is to be started, the connection between the engine and the front wheels of the vehicle needs to be disconnected. Specifically, the first clutch can be controlled to open and disconnect the engine from the front wheels so that the engine can be started without load.

[0097] The user can send a switching instruction to the vehicle to switch to the direct drive mode in the pure electric four-wheel drive mode. When the vehicle receives the above switching instruction, it determines that the vehicle needs to switch from the pure electric four-wheel drive mode to the direct drive mode.

[0098] In some embodiments, the vehicle may determine that it needs to switch from pure electric four-wheel drive mode to direct drive mode in scenarios where greater power output is required in pure electric four-wheel drive mode, such as when the vehicle speed is greater than a preset speed or the depth of the accelerator pedal is greater than a preset depth, or when the charge of the high-voltage battery is lower than a preset threshold.

[0099] In one possible implementation, when it is determined that the vehicle needs to switch from the pure electric four-wheel drive mode to the direct drive mode, the first clutch is controlled to open, including: when it is determined that the vehicle needs to switch from the pure electric four-wheel drive mode to the direct drive mode, the front drive motor is controlled to reduce the torque; when it is determined that the actual torque of the front drive motor is lower than the target torque, the first clutch is controlled to open.

[0100] It is understandable that in the above-mentioned pure electric four-wheel drive mode, the front drive motor of the vehicle outputs a certain torque to the front wheels of the vehicle through the second clutch and the first clutch to drive the vehicle. After the first clutch is opened, the front drive motor and the front wheels of the vehicle are disconnected. At this time, the front drive motor has no load and is prone to spin.

[0101] In order to prevent the front-drive motor from spinning after the first clutch is opened, when it is determined that the vehicle needs to switch from pure electric four-wheel drive mode to direct drive mode, it is necessary to first control the front-drive motor to reduce torque. After determining that the actual torque of the front-drive motor is lower than the target torque, the first clutch is controlled to open.

[0102] The target torque is a torque set in advance to ensure that the front drive motor does not spin out of control, and is usually slightly greater than 0 NM (Newton-meter), for example, 2 NM, to ensure that the torque of the front drive motor is reduced to about 0 NM and does not spin out of control after the first clutch is opened.

[0103] Specifically, when it is determined that the current actual operation mode of the vehicle is pure electric four-wheel drive mode, the second input shaft is in neutral gear, the first input shaft is in an odd gear, and the K2 clutch is closed and the K1 clutch is closed, if it is determined that the target operation mode to be switched by the vehicle is direct drive mode, it can be determined that the vehicle's engine has a start requirement. At this time, the HCU controls the front drive motor torque to 0Nm. When it is detected that the actual torque of the front drive motor is lower than the target torque of 2Nm, the HCU sends a K1 clutch opening request to the TCU. After receiving the K1 clutch opening request sent by the HCU, the TCU controls the K1 clutch to open and sends the actual state of the K1 clutch as the open state to the HCU.

[0104] In the above method, by controlling the actual torque of the front-drive motor to drop below the target torque and then controlling the first clutch to open, the inertia of the front-drive motor after the first clutch is opened is reduced, the front-drive motor is avoided from spinning, the damage to the front-drive motor is reduced, and the stability of the vehicle during mode switching is improved.

[0105] S12, when it is determined that the first clutch is in the open state and the second clutch is in the closed state, controlling the engine ignition of the vehicle to start the engine.

[0106] It can be understood that after determining that the vehicle needs to switch from pure electric four-wheel drive mode to direct drive mode, only the first clutch is controlled to open, and the second clutch is in a closed state in the pure electric four-wheel drive mode. If the second clutch is not controlled, the second clutch will still be in a closed state.

[0107] When it is determined that the first clutch is in an open state and the second clutch is in a closed state, the engine ignition system can be controlled to start working, ignite the mixed gas in the engine cylinder, and make the engine enter a self-sustaining operation state to start the engine.

[0108] In one possible implementation, when it is determined that the first clutch is in an open state and the second clutch is in a closed state, the engine ignition is controlled to start the engine, including: when it is determined that the first clutch is in an open state and the second clutch is in a closed state, judging whether the actual speed of the engine is greater than or equal to the preset speed; when it is determined that the actual speed is greater than or equal to the preset speed, controlling the engine ignition to start the engine.

[0109] It can be understood that one end of the second clutch is connected to the engine and the other end is connected to the front drive motor. In the pure electric four-wheel drive mode, the second clutch is in a closed state, and part of the torque output by the front drive motor will be transmitted to the engine through the second clutch to drive the engine to rotate. Therefore, when switching from the pure electric four-wheel drive mode to the direct drive mode, although the engine is not started, the engine currently has a certain speed.

[0110] When it is determined that the first clutch is in the open state and the second clutch is in the closed state, the current actual speed of the engine can be obtained to determine whether the actual speed of the engine is greater than or equal to the preset speed. The preset speed is the minimum speed at which the engine can be ignited and started, such as 900 rpm, to ensure that the engine can be stably ignited.

[0111] When it is determined that the actual engine speed is greater than or equal to the preset speed, it can be determined that the engine meets the conditions for stable ignition. At this time, the ignition system that controls the engine starts working, ignites the mixture in the engine cylinder, and puts the engine into a self-sustaining operation state to start the engine.

[0112] Specifically, after detecting that the K1 clutch is open, the HCU determines whether the current actual speed of the engine is greater than or equal to the preset speed of 900rpm. When determining that the current actual speed of the engine is greater than or equal to the preset speed of 900rpm, the HCU sends an ignition command to the ECM. After receiving the ignition command sent by the HCU, the ECM controls the engine ignition.

[0113] In the above method, since the front-drive motor itself will drive the engine to rotate in the pure electric four-wheel drive mode, after the first clutch is opened, it is first determined whether the engine speed has reached the preset ignition speed. When it is determined whether the engine speed has reached the preset ignition speed, the engine ignition is directly controlled to start the engine. The speed of the front-drive motor to drive the engine to rotate in the pure electric four-wheel drive mode when the even-numbered shaft is unavailable is reasonably utilized, thereby shortening the engine starting time.

[0114] In one possible implementation, the method also includes: when it is determined that the actual speed is less than the preset speed, controlling the front drive motor to output torque through the second clutch to drag the engine to rotate until the actual speed of the engine is greater than or equal to the preset speed, and controlling the engine ignition to start the engine.

[0115] It is understandable that when the vehicle is in direct-drive four-wheel drive mode, the torque output by the front-drive motor is relatively small. At this time, the speed of the engine driven by the front-drive motor through the second clutch is also relatively small. If the vehicle needs to switch from pure electric four-wheel drive mode to direct-drive mode at this time, after controlling the first clutch to open, the current actual speed of the engine may be lower than the preset speed.

[0116] When it is determined that the current actual speed of the engine is less than the preset speed, it can be determined that the engine currently does not meet the stable ignition condition, and the engine speed needs to be increased. Since the second clutch of the current vehicle is in a closed state, the front drive motor can be controlled to output torque through the second clutch to drag the engine to rotate until the actual speed of the engine is greater than or equal to the preset speed, and then the engine ignition is controlled to start the engine.

[0117] Specifically, after detecting that the K1 clutch is open, the HCU determines whether the current actual speed of the engine is greater than or equal to the preset speed of 900rpm. When it is determined that the current actual speed of the engine is less than the preset speed of 900rpm, the HCU controls the front drive motor to produce torque to drag the actual speed of the engine to the above preset speed, and then sends an ignition command to the ECM. After receiving the ignition command sent by the HCU, the ECM controls the engine to ignite.

[0118] In the above method, when it is determined that the actual speed of the engine is lower than the preset speed, the closed second clutch is used to control the front drive motor to output torque to drag the engine to rotate, so that the actual speed of the engine can quickly reach the preset speed, ensuring stable ignition of the engine and improving the success rate of engine starting.

[0119] S13, when it is determined that the engine is started successfully, controlling the first clutch to close so that the vehicle switches to the direct drive mode.

[0120] If the engine is successfully ignited, it can be determined that the engine is started successfully. Since the first clutch and the second clutch of the vehicle are both in the closed state in the direct drive mode, the first clutch can be controlled to close at this time to switch the vehicle from the pure electric four-wheel drive mode to the direct drive mode.

[0121] In the above method, in the pure electric four-wheel drive mode where the even gears are unavailable and the first clutch and the second clutch are both closed, the first clutch is controlled to open, the engine is ignited to start the engine, and after the engine is successfully started, the first clutch is controlled to close. This enables the vehicle to start the engine in the pure electric four-wheel drive mode where the even gears are unavailable and the first clutch and the second clutch are both closed, thereby ensuring the vehicle's switching from the pure electric four-wheel drive mode to the direct drive mode and improving the success rate of the vehicle mode switching.

[0122] In one possible implementation, when it is determined that the engine has started successfully, the first clutch is controlled to close so that the vehicle switches to the direct drive mode, including: when it is determined that the engine has started successfully, the rotational speed of the first input shaft is obtained; according to the rotational speed of the first input shaft, the rotational speed of the front-drive motor is adjusted to reduce the speed difference between the two ends of the first clutch; when the speed difference between the two ends of the first clutch is less than the preset speed difference, the first clutch is controlled to close so that the vehicle switches to the direct drive mode.

[0123] The condition for closing the first clutch is that the speed difference between the two ends of the first clutch is less than the preset speed difference to ensure that the first clutch can be closed safely. The two ends of the first clutch are the first input shaft and the second clutch, the second clutch is connected to the front drive motor, and the first input shaft is connected to the front wheels of the vehicle. At this time, the vehicle is in a driving state, that is, the front wheels of the vehicle have a certain speed, and the corresponding first input shaft has a certain speed.

[0124] Before closing the first clutch, it is necessary to obtain the speed of the first input shaft, and adjust the speed of the front drive motor according to the speed of the first input shaft so that the speed difference between the two ends of the first clutch is less than the preset speed difference. When the speed difference between the two ends of the first clutch is less than the preset speed difference, the first clutch is controlled to close so that the vehicle switches from the pure electric four-wheel drive mode to the direct drive mode.

[0125] Specifically, when the engine ignition is detected to be successful, the HCU adjusts the speed of the front drive motor according to the speed of the odd-numbered input shaft (i.e., the first input shaft) to reduce the speed difference at both ends of the K1 clutch (i.e., the first clutch). When the speed difference at both ends of the K1 clutch is less than the preset speed difference (e.g., 100rpm), the HCU sends a K1 clutch closing command to the TCU. After receiving the K1 clutch closing command, the TCU controls the K1 clutch to close and sends the actual state of the K1 clutch as a closed state to the HCU. When the HCU detects that the K1 clutch is in a closed state, the actual operating mode of the vehicle is set to the direct drive mode.

[0126] In some embodiments, after determining that the actual operating mode of the vehicle is the direct drive mode, the HCU controls the engine and the front drive motor to jointly output torque to the front wheels of the vehicle to drive the vehicle.

[0127] In the above method, after the engine is successfully started, the speed of the front-drive motor is adjusted based on the speed of the first input shaft connected to one end of the first clutch. The front-drive motor can drive the speed of the other end of the first clutch through the second clutch to reduce the speed difference between the two ends of the first clutch, thereby ensuring the safe and smooth closing of the first clutch and avoiding impact or vibration when the first clutch is closed, thereby improving driving comfort and vehicle stability.

[0128] In summary, in the present application, when the vehicle switches from the pure electric rear-drive mode to the pure electric four-wheel drive mode, if it is determined that the even gear on the second input shaft is unavailable, the first input shaft is controlled to be engaged in the odd gear, and the first clutch and the second clutch are controlled to be closed, so that the front-drive motor of the vehicle can transmit power to the front wheels of the vehicle through the second clutch, the first clutch and the first input shaft, ensuring that the vehicle can switch from the pure electric rear-drive mode to the pure electric four-wheel drive mode when the even gear is unavailable, ensuring that the power output of the vehicle meets the needs of users, improving the power performance of the vehicle, and improving the success rate of the vehicle switching to the pure electric four-wheel drive mode. Controlling the closing of the second clutch first and then controlling the closing of the first clutch can avoid the redundant operation of closing the first clutch when the second clutch cannot be closed. In the pure electric four-wheel drive mode when the even gears are unavailable and the first clutch and the second clutch are both closed, the first clutch is controlled to open and the engine is ignited to start the engine. After the engine starts successfully, the first clutch is controlled to close. This enables the vehicle to start the engine in the pure electric four-wheel drive mode when the even gears are unavailable and the first clutch and the second clutch are both closed, ensuring the vehicle's switching from the pure electric four-wheel drive mode to the direct drive mode and improving the success rate of the vehicle's mode switching.

[0129] Figure 3 It is a structural schematic diagram of a device for controlling module switching provided in an embodiment of the present application.

[0130] The invention is applied to a hybrid vehicle, the vehicle comprises a hybrid transmission, the hybrid transmission comprises: a first input shaft and a second input shaft, the first input shaft is connected to a first clutch, and the second input shaft is connected to a second clutch.

[0131] For example, Figure 3 As shown, the device 300 includes:

[0132] The first control module 301 is used to control the second input shaft to shift into an even-numbered gear when it is determined that the vehicle needs to switch from the pure electric rear-wheel drive mode to the pure electric four-wheel drive mode;

[0133] A determination module 302 is configured to determine that an even-numbered gear on the second input shaft is unavailable if it is detected that the gear position of the second input shaft is neutral;

[0134] The second control module 303 is used to control the first input shaft to be engaged in an odd gear and control the second clutch and the first clutch to be engaged, so that the vehicle switches to the pure electric four-wheel drive mode when it is determined that the even gear on the second input shaft is unavailable;

[0135] The third control module 304 is used to control the front drive motor of the vehicle to output torque to the front wheels of the vehicle through the second clutch, the first clutch and the first input shaft when it is determined that the vehicle is switched to the pure electric four-wheel drive mode.

[0136] In one possible implementation, the second control module 303 is specifically used to control the speed of the front-drive motor to be less than or equal to the target speed; when the actual speed of the front-drive motor is less than or equal to the target speed, the second clutch is first controlled to close, and then the first clutch is controlled to close.

[0137] In one possible implementation, the device also includes: a fourth control module, which is used to control the first clutch to open when it is determined that the vehicle needs to switch from the pure electric four-wheel drive mode to the direct drive mode; a fifth control module, which is used to control the vehicle's engine ignition to start the engine when it is determined that the first clutch is in an open state and the second clutch is in a closed state; and a sixth control module, which is used to control the first clutch to close when it is determined that the engine has started successfully, so that the vehicle can switch to the direct drive mode.

[0138] In one possible implementation, the fourth control module is specifically used to control the front-drive motor to reduce torque when it is determined that the vehicle needs to switch from the pure electric four-wheel drive mode to the direct drive mode; and to control the first clutch to open when it is determined that the actual torque of the front-drive motor is lower than the target torque.

[0139] In one possible implementation, the fifth control module is specifically used to, when it is determined that the first clutch is in an open state and the second clutch is in a closed state, determine whether the actual speed of the engine is greater than or equal to the preset speed; when it is determined that the actual speed is greater than or equal to the preset speed, control the engine ignition to start the engine.

[0140] In one possible implementation, the fifth control module is specifically used to, when it is determined that the actual speed is less than the preset speed, control the front-drive motor to output torque through the second clutch to drag the engine to rotate until the actual speed of the engine is greater than or equal to the preset speed, and control the engine ignition to start the engine.

[0141] In one possible implementation, the sixth control module is specifically used to, when it is determined that the engine has been started successfully, obtain the rotational speed of the first input shaft; adjust the rotational speed of the front-drive motor according to the rotational speed of the first input shaft to reduce the speed difference across the first clutch; and when the speed difference across the first clutch is less than a preset speed difference, control the first clutch to close so that the vehicle switches to direct drive mode.

[0142] Figure 4 It is a structural schematic diagram of a vehicle provided in an embodiment of the present application.

[0143] For example, Figure 4 As shown, the vehicle 400 includes: a memory 401 and a processor 402, wherein the memory 401 stores an executable program code 4011, and the processor 402 is used to call and execute the executable program code 4011 to perform a method for switching a control mode.

[0144] In addition, an embodiment of the present application also protects a device, which may include a memory and a processor, wherein the memory stores an executable program code, and the processor is used to call and execute the executable program code to perform a method for control mode switching provided in an embodiment of the present application.

[0145] In this embodiment, the functional modules of the device can be divided according to the above method example. For example, each functional module can be corresponded, or two or more functions can be integrated into one processing module. The above integrated module can be implemented in the form of hardware. It should be noted that the division of modules in this embodiment is schematic and is only a logical function division. There may be other division methods in actual implementation.

[0146] In the case of dividing each functional module according to each function, the device may also include a first control module, a determination module, a second control module, and a third control module. It should be noted that all relevant contents of each step involved in the above method embodiment can be referred to the functional description of the corresponding functional module, which will not be repeated here.

[0147] It should be understood that the device provided in this embodiment is used to execute the above-mentioned method for switching control modes, and thus can achieve the same effect as the above-mentioned implementation method.

[0148] In the case of an integrated unit, the device may include a processing module and a storage module. When the device is applied to a vehicle, the processing module may be used to control and manage the actions of the vehicle. The storage module may be used to support the vehicle in executing relevant program codes, etc.

[0149] The processing module may be a processor or a controller, which may implement or execute various exemplary logic blocks, modules and circuits shown in combination with the contents disclosed in this application. The processor may also be a combination that implements computing functions, such as a combination of one or more microprocessors, a combination of digital signal processing (DSP) and a microprocessor, etc. The storage module may be a memory.

[0150] In addition, the device provided in the embodiments of the present application may specifically be a chip, a component or a module, and the chip may include a connected processor and a memory; wherein the memory is used to store instructions, and when the processor calls and executes the instructions, the chip can execute a control mode switching method provided in the above embodiments.

[0151] This embodiment also provides a computer-readable storage medium, in which a computer program code is stored. When the computer program code is executed on a computer, the computer executes the above-mentioned related method steps to implement a control mode switching method provided in the above embodiment.

[0152] This embodiment further provides a computer program product. When the computer program product is run on a computer, the computer is caused to execute the above-mentioned related steps to implement a control mode switching method provided in the above embodiment.

[0153] Among them, the device, computer-readable storage medium, computer program product or chip provided in this embodiment is used to execute the corresponding method provided above. Therefore, the beneficial effects that can be achieved can refer to the beneficial effects in the corresponding method provided above, and will not be repeated here.

[0154] Through the description of the above implementation methods, technical personnel in the relevant field can understand that for the convenience and simplicity of description, only the division of the above-mentioned functional modules is used as an example. In actual applications, the above-mentioned functions can be assigned to different functional modules as needed, that is, the internal structure of the device can be divided into different functional modules to complete all or part of the functions described above.

[0155] In the embodiments provided in the present application, it should be understood that the disclosed devices and methods can be implemented in other ways. For example, the device embodiments described above are only schematic, for example, the division of modules or units is only a logical function division, and there may be other division methods in actual implementation, such as multiple units or components can be combined or integrated into another device, or some features can be ignored or not executed. Another point is that the mutual coupling or direct coupling or communication connection shown or discussed can be through some interfaces, indirect coupling or communication connection of devices or units, which can be electrical, mechanical or other forms.

[0156] The above contents are only specific implementation methods of the present application, but the protection scope of the present application is not limited thereto. Any technician familiar with the technical field can easily think of changes or substitutions within the technical scope disclosed in the present application, which should be included in the protection scope of the present application. Therefore, the protection scope of the present application should be based on the protection scope of the claims.

Claims

1. A method for switching a control mode, characterized in that: A hybrid vehicle is applied, the vehicle includes a hybrid transmission, the hybrid transmission includes: a first input shaft and a second input shaft, the first input shaft is connected to a first clutch, the second input shaft is connected to a second clutch, the first clutch is used to disconnect or connect the mechanical connection between the engine of the vehicle and the first input shaft, the second clutch is used to disconnect or connect the mechanical connection between the engine of the vehicle and the second input shaft, the front drive motor of the vehicle is connected to the second input shaft, and the method includes: When it is determined that the vehicle needs to switch from the pure electric rear-wheel drive mode to the pure electric four-wheel drive mode, controlling the second input shaft to be engaged in an even-numbered gear; If it is detected that the gear position of the second input shaft is neutral, determining that the even-numbered gear on the second input shaft is unavailable; When it is determined that the even gear on the second input shaft is unavailable, controlling the first input shaft to be engaged in the odd gear, and controlling both the second clutch and the first clutch to be engaged, so that the vehicle is switched to the pure electric four-wheel drive mode; When it is determined that the vehicle is switched to the pure electric four-wheel drive mode, the front drive motor of the vehicle is controlled to output torque to the front wheels of the vehicle through the second clutch, the first clutch and the first input shaft.

2. The method according to claim 1, characterized in that Controlling the second clutch and the first clutch to close includes: Controlling the rotation speed of the front drive motor to be less than or equal to the target rotation speed; When the actual speed of the front-drive motor is less than or equal to the target speed, the second clutch is controlled to close first, and then the first clutch is controlled to close.

3. The method according to claim 1 or 2, characterized in that: After controlling the front drive motor of the vehicle to output torque to the front wheels of the vehicle through the second clutch, the first clutch and the first input shaft, the method further includes: When it is determined that the vehicle needs to switch from the pure electric four-wheel drive mode to the direct drive mode, controlling the first clutch to open; When it is determined that the first clutch is in an open state and the second clutch is in a closed state, controlling an engine ignition of the vehicle to start the engine; When it is determined that the engine is started successfully, the first clutch is controlled to close so that the vehicle is switched to the direct drive mode.

4. The method according to claim 3, characterized in that When it is determined that the vehicle needs to switch from the pure electric four-wheel drive mode to the direct drive mode, controlling the first clutch to open includes: When it is determined that the vehicle needs to switch from the pure electric four-wheel drive mode to the direct drive mode, controlling the front drive motor to reduce torque; When it is determined that the actual torque of the front drive motor is lower than the target torque, the first clutch is controlled to be opened.

5. The method according to claim 3, characterized in that: When it is determined that the first clutch is in an open state and the second clutch is in a closed state, controlling the engine ignition of the vehicle to start the engine comprises: When it is determined that the first clutch is in an open state and the second clutch is in a closed state, determining whether the actual speed of the engine is greater than or equal to a preset speed; When it is determined that the actual speed is greater than or equal to the preset speed, the engine ignition is controlled to start the engine.

6. The method according to claim 5, characterized in that The method further comprises: When it is determined that the actual speed is less than the preset speed, the front-drive motor is controlled to output torque through the second clutch to drag the engine to rotate until the actual speed of the engine is greater than or equal to the preset speed, and the engine is controlled to ignite to start the engine.

7. The method according to claim 3, characterized in that When it is determined that the engine is started successfully, controlling the first clutch to close so that the vehicle switches to the direct drive mode includes: When it is determined that the engine is started successfully, obtaining the rotation speed of the first input shaft; According to the rotation speed of the first input shaft, adjusting the rotation speed of the front drive motor to reduce the speed difference between the two ends of the first clutch; When the speed difference between the two ends of the first clutch is less than a preset speed difference, the first clutch is controlled to close so that the vehicle switches to the direct drive mode.

8. A device for controlling module switching, characterized in that: A hybrid vehicle is applied to the hybrid vehicle, the vehicle includes a hybrid transmission, the hybrid transmission includes: a first input shaft and a second input shaft, the first input shaft is connected to a first clutch, the second input shaft is connected to a second clutch, the first clutch is used to disconnect or connect the mechanical connection between the engine of the vehicle and the first input shaft, the second clutch is used to disconnect or connect the mechanical connection between the engine of the vehicle and the second input shaft, the front drive motor of the vehicle is connected to the second input shaft, and the device includes: A first control module is used to control the second input shaft to shift into an even-numbered gear when it is determined that the vehicle needs to switch from a pure electric rear-wheel drive mode to a pure electric four-wheel drive mode; a determination module, configured to determine that an even-numbered gear on the second input shaft is unavailable if it is detected that the gear position of the second input shaft is a neutral gear; a second control module, configured to control the first input shaft to be engaged in an odd gear, and control both the second clutch and the first clutch to be engaged, so that the vehicle is switched to the pure electric four-wheel drive mode, when it is determined that the even gear on the second input shaft is unavailable; The third control module is used to control the front drive motor of the vehicle to output torque to the front wheels of the vehicle through the second clutch, the first clutch and the first input shaft when it is determined that the vehicle is switched to the pure electric four-wheel drive mode.

9. A vehicle, characterized in that: The vehicle comprises: A memory for storing executable program codes; A processor, configured to call and run the executable program code from the memory, so that the vehicle executes the method according to any one of claims 1 to 7.

10. A computer-readable storage medium, characterized in that: The computer-readable storage medium stores a computer program, and when the computer program is executed, the method according to any one of claims 1 to 7 is implemented.

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