Shift control method, device, system, vehicle and storage medium of hybrid vehicle

Abstract

The application provides a shift control method, device and system of a hybrid vehicle, a vehicle and a storage medium, and belongs to the technical field of vehicle control. The method comprises the following steps: in the case that the vehicle is switched from a pure electric four-wheel drive mode to a pure electric rear-wheel drive mode, the torque of a front-wheel drive motor is controlled to be reduced, so that the torque of the front-wheel drive motor meets a synchronizer disengagement condition; in the case that the torque of the front-wheel drive motor meets the synchronizer disengagement condition, the synchronizer is controlled to be disengaged; and in the case that the synchronizer is successfully disengaged, the rotating speed of the front-wheel drive motor is controlled to be lower than a target rotating speed, so that a clutch meets a rapid closing condition. According to the embodiment of the application, in the case that the vehicle is switched from the pure electric four-wheel drive mode to the pure electric rear-wheel drive mode and needs to be immediately switched to a series mode, the clutch can be rapidly closed, and the engine can be started quickly, so that the process of starting the engine after the pure electric four-wheel drive mode is switched to the pure electric rear-wheel drive mode is more coherent and fast.

Description

Technical Field

[0001] This application relates to the field of vehicle control technology, and in particular to a method, apparatus, system, vehicle, and storage medium for shift control of a hybrid vehicle. Background Technology

[0002] With advancements in technology and automotive electronics, four-wheel-drive hybrid vehicles typically offer multiple driving modes to suit different driving needs, such as series mode, pure electric four-wheel-drive mode, and pure electric rear-wheel-drive mode. In series mode, the engine drives the front-drive motor to generate electricity, which then powers the rear-drive motor to propel the vehicle.

[0003] During vehicle operation, the three modes mentioned above may switch between each other under certain conditions depending on road conditions and driving needs. For example, after switching from pure electric four-wheel drive mode to pure electric rear-wheel drive mode, it may be necessary to start the engine immediately to switch to series mode. At this time, the clutch may not be able to close smoothly, the engine may not be able to output power quickly, resulting in a delayed response or even failure to switch modes. Summary of the Invention

[0004] This application provides a shift control method, device, system, vehicle, and storage medium for hybrid vehicles to solve the problem in related technologies where the engine may not be able to quickly output power when switching from pure electric four-wheel drive mode to pure electric rear-wheel drive mode and then immediately switching to series mode.

[0005] To solve the above problems, this application adopts the following technical solution:

[0006] In a first aspect, embodiments of this application provide a shift control method for a hybrid vehicle, the method comprising:

[0007] When the vehicle switches from pure electric four-wheel drive mode to pure electric rear-wheel drive mode, the torque of the front drive motor is reduced so that the torque of the front drive motor meets the synchronizer disengagement condition.

[0008] When the torque of the front drive motor meets the synchronizer disengagement condition, the synchronizer is controlled to disengage.

[0009] When the synchronizer is successfully disengaged, the speed of the front drive motor is controlled to be lower than the target speed so that the clutch meets the condition for rapid engagement.

[0010] In one embodiment of this application, when a vehicle switches from a pure electric four-wheel drive mode to a pure electric rear-wheel drive mode, the step of controlling the torque of the front drive motor to decrease so that the torque of the front drive motor meets the synchronizer disengagement condition includes:

[0011] When the vehicle is detected to switch from the pure electric four-wheel drive mode to the pure electric rear-wheel drive mode, a torque reduction request containing the target torque is sent to the drive motor controller, so that the drive motor controller responds to the torque reduction request and controls the torque of the front drive motor to be lower than the target torque.

[0012] If the torque of the front drive motor is detected to be lower than the target torque, it is determined that the torque of the front drive motor meets the synchronizer disengagement condition.

[0013] In one embodiment of this application, the step of controlling the synchronizer to disengage when the torque of the front drive motor meets the synchronizer disengagement condition includes:

[0014] When the torque of the front drive motor meets the synchronizer disengagement condition, a synchronizer disengagement command is sent to the transmission controller so that the transmission controller responds to the synchronizer disengagement command and controls the synchronizer to disengage.

[0015] If the synchronizer is detected to be in neutral, it is determined that the synchronizer has been successfully disengaged.

[0016] In one embodiment of this application, when the synchronizer is successfully disengaged, the step of controlling the speed of the front drive motor to be lower than the target speed so that the clutch meets the condition for rapid engagement includes:

[0017] When the synchronizer is successfully disengaged, a speed control mode activation signal is sent to the drive motor controller to switch the drive motor controller from torque control mode to speed control mode.

[0018] When the drive motor controller is detected to have entered the speed control mode, a speed reduction request containing the target speed is sent to the drive motor controller, so that the drive motor controller responds to the speed reduction request and controls the speed of the front drive motor to be lower than the target speed;

[0019] When the speed of the front drive motor is lower than the target speed, a speed control mode inactivation signal is sent to the drive motor controller so that the drive motor controller switches from the speed control mode to the torque control mode.

[0020] In one embodiment of this application, after the step of controlling the speed of the front drive motor to be lower than the target speed so that the clutch meets the rapid engagement condition when the synchronizer is successfully disengaged, the method further includes:

[0021] In response to the series mode switching command, the speed difference between the front drive motor and the engine is obtained;

[0022] If the speed difference is less than the target speed, it is determined that the clutch meets the rapid closing condition;

[0023] If the clutch meets the rapid engagement condition, the clutch is controlled to engage rapidly so that the vehicle switches from the pure electric rear-wheel drive mode to the series mode. In the series mode, the engine drives the front-drive motor to generate electricity through the clutch, and the generated electricity is provided to the rear-drive motor to drive the vehicle.

[0024] In one embodiment of this application, before the step of obtaining the speed difference between the front drive motor and the engine in response to a series mode switching command, the method further includes:

[0025] If the current remaining capacity of the power battery is detected to be less than the capacity threshold, the series mode switching command is triggered.

[0026] Secondly, based on the same inventive concept, embodiments of this application provide a shift control device for a hybrid vehicle, the device comprising:

[0027] The first control module is used to control the torque of the front drive motor to decrease when the vehicle switches from pure electric four-wheel drive mode to pure electric rear drive mode, so that the torque of the front drive motor meets the synchronizer disengagement condition.

[0028] The second control module is used to control the synchronizer to disengage when the torque of the front drive motor meets the synchronizer disengagement condition.

[0029] The third control module is used to control the speed of the front drive motor to be lower than the target speed when the synchronizer is successfully disengaged, so that the clutch meets the condition for rapid engagement.

[0030] In one embodiment of this application, the first control module includes:

[0031] A torque reduction request sending submodule is used to send a torque reduction request containing a target torque to the drive motor controller when the vehicle is detected to switch from the pure electric four-wheel drive mode to the pure electric rear-wheel drive mode, so that the drive motor controller responds to the torque reduction request and controls the torque of the front drive motor to be lower than the target torque.

[0032] The first determining submodule is used to determine that the torque of the front drive motor meets the synchronizer disengagement condition when the torque of the front drive motor is detected to be lower than the target torque.

[0033] In one embodiment of this application, the second control module includes:

[0034] The synchronizer disengagement command sending submodule is used to send a synchronizer disengagement command to the transmission controller when the torque of the front drive motor meets the synchronizer disengagement condition, so that the transmission controller responds to the synchronizer disengagement command and controls the synchronizer to disengage.

[0035] The second determining submodule is used to determine that the synchronizer has successfully disengaged when it is detected that the synchronizer is in neutral.

[0036] In one embodiment of this application, the third control module includes:

[0037] The activation signal sending submodule is used to send a speed control mode activation signal to the drive motor controller when the synchronizer is successfully disengaged, so that the drive motor controller switches from torque control mode to speed control mode.

[0038] A speed reduction request sending submodule is used to send a speed reduction request containing the target speed to the drive motor controller when the drive motor controller is detected to have entered the speed control mode, so that the drive motor controller responds to the speed reduction request and controls the speed of the front drive motor to be lower than the target speed;

[0039] The inactive signal transmission submodule is used to send a speed control mode inactive signal to the drive motor controller when the speed of the front drive motor is lower than the target speed, so that the drive motor controller switches from the speed control mode to the torque control mode.

[0040] In one embodiment of this application, the shift control device for the hybrid vehicle further includes:

[0041] The acquisition module is used to acquire the speed difference between the front drive motor and the engine in response to a series mode switching command after the step of controlling the speed of the front drive motor to be lower than the target speed so that the clutch meets the rapid closing condition when the synchronizer is successfully disengaged.

[0042] The determining module is used to determine that the clutch meets the rapid closing condition when the speed difference is less than the target speed;

[0043] The fourth control module is used to control the clutch to close rapidly when it is determined that the clutch meets the rapid closing condition, so as to switch the vehicle from the pure electric rear-wheel drive mode to the series mode; in the series mode, the engine drives the front drive motor to generate electricity through the clutch, and the generated electricity is provided to the rear drive motor to drive the vehicle.

[0044] In one embodiment of this application, the shift control device for the hybrid vehicle further includes:

[0045] The instruction triggering module is used to trigger the series mode switching instruction when the current remaining capacity of the power battery is detected to be less than the capacity threshold.

[0046] Thirdly, based on the same inventive concept, embodiments of this application provide a shift control system for a hybrid vehicle, the system comprising a vehicle controller, a transmission controller, and a drive motor controller; wherein...

[0047] The vehicle controller is used to send a torque reduction request to the drive motor controller when the vehicle switches from pure electric four-wheel drive mode to pure electric rear-wheel drive mode.

[0048] The drive motor controller is used to respond to the torque reduction request by controlling the torque of the front drive motor to decrease so that the torque of the front drive motor meets the synchronizer disengagement condition.

[0049] The vehicle controller is also used to send a synchronizer disengagement command to the transmission controller when the torque of the front drive motor meets the synchronizer disengagement condition.

[0050] The transmission controller is used to control the synchronizer to disengage in response to the synchronizer disengagement command;

[0051] The vehicle controller is also used to send a speed reduction request to the drive motor controller when the synchronizer is successfully disengaged;

[0052] The drive motor controller is also configured to, in response to the speed reduction request, control the speed of the front drive motor to be lower than the target speed so that the clutch meets the rapid engagement condition.

[0053] Fourthly, based on the same inventive concept, embodiments of this application provide a vehicle including the shift control system for a hybrid vehicle proposed in the third aspect of this application.

[0054] Fifthly, based on the same inventive concept, embodiments of this application provide a storage medium storing machine-executable instructions, which, when executed by a processor, implement the gear shifting control method for hybrid vehicles proposed in the first aspect of this application.

[0055] Compared with the prior art, this application has the following advantages:

[0056] This application provides a shift control method for a hybrid vehicle, comprising: when the vehicle switches from a pure electric four-wheel drive mode to a pure electric rear-wheel drive mode, controlling the torque of the front drive motor to decrease so that the torque of the front drive motor meets the synchronizer disengagement condition; when the torque of the front drive motor meets the synchronizer disengagement condition, controlling the synchronizer to disengage; and when the synchronizer successfully disengages, controlling the speed of the front drive motor to be lower than the target speed so that the clutch meets the rapid engagement condition. This application embodiment can actively control the torque reduction of the front drive motor when the vehicle switches from a pure electric four-wheel drive mode to a pure electric rear-wheel drive mode, achieving rapid synchronizer disengagement. Furthermore, after the synchronizer completes disengagement, it actively controls the speed of the front drive motor to rapidly decrease to the target speed. Therefore, when the engine needs to be started to switch to a series mode, the clutch can quickly engage, and the front drive motor can quickly start the engine. This makes the process of switching from a pure electric four-wheel drive mode to a pure electric rear-wheel drive mode and then starting the engine more seamless and faster, effectively avoiding lag or even failure in mode switching response. Attached Figure Description

[0057] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0058] Figure 1 This is a schematic diagram of the structure of a hybrid vehicle in one embodiment of this application.

[0059] Figure 2 This is a flowchart illustrating the steps of a gear shifting control method for a hybrid vehicle according to one embodiment of this application.

[0060] Figure 3 This is a schematic diagram of the functional modules of a shift control device for a hybrid vehicle according to one embodiment of this application.

[0061] Figure 4 This is a schematic diagram of the gear shift control system of a hybrid vehicle according to one embodiment of this application.

[0062] Figure 5 This is a structural schematic diagram of a vehicle according to one embodiment of this application. Detailed Implementation

[0063] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0064] Reference Figure 1 The diagram shows a schematic of the structure of a hybrid vehicle according to an embodiment of this application. The hybrid vehicle includes a front-drive motor 101, a rear-drive motor 102, an engine 103, a clutch 104, a synchronizer 105, and a differential 106. The front-drive motor 101 is connected to one end of an input shaft, and the other end of the input shaft is connected to the engine 103 via the clutch 104. The input shaft is connected to an output shaft via a gear set, and a transmission gear that meshes with the differential 106 is connected to the output shaft. The synchronizer 105 is connected to the gear set and is used to synchronize the gear speeds between different gears. The rear-drive motor 102 is located on the rear axle and is used to provide power to the rear wheels through the rear drive shaft to drive the vehicle.

[0065] Hybrid vehicles employing the aforementioned architecture, equipped with a front-drive motor 101, a rear-drive motor 102, and an engine 103, typically offer multiple driving modes, including series mode, pure electric four-wheel drive mode, and pure electric rear-wheel drive mode, to adapt to different road conditions and driving needs. In pure electric four-wheel drive mode, the engine 103 is off, the clutch 104 is disengaged, the synchronizer 105 is engaged, and the vehicle is driven by both the front-drive motor 101 and the rear-drive motor 102. In pure electric rear-wheel drive mode, the engine 103 is off, the front-drive motor 101 is not engaged, the synchronizer 105 is in neutral, and the vehicle is driven solely by the rear-drive motor 102. In series mode, the engine 103 is running, the clutch 104 is engaged, the synchronizer 105 is in neutral, and the engine 103 drives the front-drive motor 101 to generate electricity via the clutch 104. This generated electricity is then supplied to the rear-drive motor 102 to drive the vehicle. During vehicle operation, the three modes mentioned above may switch between each other under certain conditions depending on road conditions and driving needs. If the vehicle switches from pure electric four-wheel drive mode to pure electric rear-wheel drive mode and then immediately switches to series mode, the engine 103 may not be able to output power quickly, resulting in a delayed mode switching response or even a failure to switch.

[0066] In response to the above phenomenon, the inventors of this application discovered that during the process of switching from pure electric four-wheel drive mode to pure electric rear-wheel drive mode, the synchronizer 105 of the front axle gearbox will disengage to reduce resistance. After the synchronizer 105 disengages, the front drive motor 101 will rotate freely. If the vehicle needs to switch to series mode at this time, after the engine starts, due to the large speed difference between the two ends of the clutch 104, the clutch 104 will not be able to close quickly, so the engine 103 cannot output power quickly, resulting in a delayed mode switching response or even a failure to switch.

[0067] To address the shortcomings of the aforementioned background technology, this application aims to provide a shift control method for hybrid vehicles. This method can quickly reduce the speed of the front drive motor 101 to a target speed after the vehicle switches from pure electric four-wheel drive mode to pure electric rear-wheel drive mode. This allows the clutch 104 to quickly close when switching to series mode, enabling the front drive motor 101 to drive the engine 103 to start quickly. This makes the process of switching from pure electric four-wheel drive mode to pure electric rear-wheel drive mode and then starting the engine 103 more seamless and faster, effectively avoiding the occurrence of delayed mode switching response or even switching failure.

[0068] Reference Figure 2 This application illustrates a shift control method for a hybrid vehicle, applied to a vehicle controller. The method may include the following steps:

[0069] S201: When the vehicle switches from pure electric four-wheel drive mode to pure electric rear-wheel drive mode, the torque of the front drive motor 101 is reduced so that the torque of the front drive motor 101 meets the disengagement condition of the synchronizer 105.

[0070] In this embodiment, the Vehicle Control Unit (VCU) can respond to a user-triggered command to switch the vehicle's driving mode from pure electric four-wheel drive mode to pure electric rear-wheel drive mode. The VCU can also automatically switch the vehicle's driving mode from pure electric four-wheel drive mode to pure electric rear-wheel drive mode when the vehicle meets preset pure electric rear-wheel drive mode switching conditions, such as when the driver's accelerator pedal opening degree is less than the opening degree threshold.

[0071] In this embodiment, after the vehicle switches to pure electric rear-wheel drive mode, the front-drive motor 101 will not participate in power output. To reduce the resistance of the front axle transmission, it is necessary to control the synchronizer 105 to disengage. However, for the synchronizer 105 to disengage, the torque of the front-drive motor 101 must be lower than a target torque to meet the disengagement condition. Therefore, after the VCU switches the vehicle from pure electric four-wheel drive mode to pure electric rear-wheel drive mode, it will trigger an active torque reduction strategy to control the torque of the front-drive motor 101 to decrease rapidly until the torque of the front-drive motor 101 meets the disengagement condition of the synchronizer 105.

[0072] S202: When the torque of the front drive motor 101 meets the conditions for the synchronizer 105 to disengage, control the synchronizer 105 to disengage.

[0073] In this embodiment, after the VCU detects that the torque of the front drive motor 101 is lower than the target torque, it determines that the torque of the front drive motor 101 meets the disengagement condition of the synchronizer 105, and controls the synchronizer 105 to perform the disengagement operation.

[0074] In the specific implementation, after the VCU controls the synchronizer 105 to disengage, it will obtain the current gear position of the synchronizer 105 in real time. If it detects that the current gear position of the synchronizer 105 is neutral, it will determine that the synchronizer 105 has completed the disengagement operation.

[0075] S203: When the synchronizer 105 is successfully disengaged, the speed of the front drive motor 101 is controlled to be lower than the target speed so that the clutch 104 meets the condition for rapid engagement.

[0076] In this embodiment, when the synchronizer 105 is successfully disengaged, the VCU will trigger an active speed reduction strategy to control the speed of the front drive motor 101 to decrease rapidly until the speed of the front drive motor 101 is lower than the target speed. The target speed can be set to 50 rpm.

[0077] It should be noted that the condition for rapid engagement of clutch 104 is that the speed difference between the front drive motor 101 and the engine 103 located at both ends of clutch 104 is less than a calibrated value. Since the engine 103 is off during the transition from pure electric four-wheel drive mode to pure electric rear-wheel drive mode, meaning the engine 103's speed is zero, the speed difference at both ends of clutch 104 is numerically equal to the speed of the front drive motor 101. If the speed of the front drive motor 101 is lower than the target speed, it means the speed difference at both ends of clutch 104 is lower than the target speed. Therefore, the condition for rapid engagement of clutch 104 is equivalent to: the speed difference between the front drive motor 101 and the engine 103 located at both ends of clutch 104 being less than the target speed.

[0078] In this embodiment, after the synchronizer 105 successfully disengages, the speed of the front drive motor 101 is actively controlled to decrease to the target speed, which enables the clutch 104 to quickly meet the fast closing condition. Thus, when it is necessary to start the engine 103 to switch to the series mode, the clutch 104 can quickly close, and the front drive motor 101 drags the engine 103 to start quickly. This makes the process of switching from pure electric four-wheel drive mode to pure electric rear drive mode and then starting the engine 103 more smooth and faster, effectively avoiding the occurrence of mode switching response lag or even switching failure.

[0079] In one feasible implementation, S201 may specifically include the following steps:

[0080] S201-1: When the vehicle is detected to switch from pure electric four-wheel drive mode to pure electric rear-wheel drive mode, a torque reduction request containing the target torque is sent to the drive motor controller so that the drive motor controller responds to the torque reduction request and controls the torque of the front drive motor 101 to be lower than the target torque.

[0081] In this embodiment, when the VCU detects that the vehicle has switched from pure electric four-wheel drive mode to pure electric rear-wheel drive mode, it will read the pre-stored target torque from its memory, generate a torque reduction request for the front drive motor 101 containing the target torque, and send it to the drive motor controller. The drive motor controller obtains the target torque by parsing the torque reduction request sent by the VCU, and then controls the front drive motor 101 to perform torque control with the target torque as the control target. After the drive motor controller controls the torque of the front drive motor 101 to be lower than the target torque, it will feed back a torque reduction completion signal to the VCU indicating that the torque of the front drive motor 101 has been lowered than the target torque.

[0082] In this embodiment, the target torque can be set to 1 N·m. That is, when the torque of the front drive motor 101 is less than 1 N·m, it can be considered that the front drive motor 101 has no torque output, and the synchronizer 105 can be disengaged.

[0083] S201-2: If the torque of the front drive motor 101 is detected to be lower than the target torque, determine that the torque of the front drive motor 101 meets the disengagement condition of the synchronizer 105.

[0084] In this embodiment, after the VCU obtains the torque reduction completion signal fed back by the drive motor controller, it determines that the torque of the front drive motor 101 has met the disengagement condition of the synchronizer 105, and then controls the synchronizer 105 to perform the disengagement operation.

[0085] In this embodiment, by actively controlling the drive motor to reduce torque at the first moment when the vehicle switches from pure electric four-wheel drive mode to pure electric rear-wheel drive mode, the synchronizer 105 can be quickly disengaged, shortening the start-up time of the engine 103.

[0086] In one feasible implementation, S202 may specifically include the following steps:

[0087] S202-1: When the torque of the front drive motor 101 meets the conditions for the synchronizer 105 to disengage, a synchronizer disengagement command is sent to the transmission controller so that the transmission controller responds to the synchronizer disengagement command and controls the synchronizer 105 to disengage.

[0088] It should be noted that in order to ensure that the synchronizer 105 can shift gears smoothly, the synchronizer 105 needs the permission of VCU whether it is disengaging or engaging a gear. Therefore, after the torque of the front drive motor 101 meets the disengagement condition of the synchronizer 105, the VCU will also send a shift permission signal to the transmission controller and the engine controller to make the synchronizer disengagement command take effect.

[0089] In this embodiment, during the process of disengaging the synchronizer 105, the transmission controller will provide real-time feedback of the shift process signal to the VCU. This shift process signal represents the current progress of the entire shift speed adjustment process. After receiving the shift process signal, the VCU will continuously send shift permission signals to the transmission controller and the engine controller until the entire shift speed adjustment process is completed. For example, after the transmission controller controls the synchronizer 105 to disengage, it will provide feedback to the VCU with a shift process signal indicating "the synchronizer has disengaged." If the transmission controller detects that the speed of the front drive motor 101 is lower than the target speed, it will also provide feedback to the VCU with a shift process signal indicating "shift speed adjustment is complete." After receiving this shift process signal, the VCU determines that the entire shift speed adjustment process has been completed.

[0090] S202-2: If synchronizer 105 is detected to be in neutral, it is determined that synchronizer 105 has successfully disengaged.

[0091] In this embodiment, when the VCU receives the shift process signal "the synchronizer has completed disengagement" from the transmission controller, it considers that the synchronizer 105 is in neutral, and thus determines that the synchronizer 105 has successfully disengaged.

[0092] In one feasible implementation, S203 may specifically include the following steps:

[0093] S203-1: When the synchronizer 105 is successfully disengaged, a speed control mode activation signal is sent to the drive motor controller to enable the drive motor controller to switch from torque control mode to speed control mode.

[0094] It should be noted that for hybrid vehicles with separate drive motor controllers and transmission controllers, the VCU can directly send a speed control mode activation signal to the motor controller. For hybrid vehicles where the drive motor controller is integrated into the transmission controller, the transmission controller can send a speed control mode activation signal to the drive motor controller, allowing the transmission controller to reduce the speed of the front drive motor 101. In this case, the transmission controller controls the drive motor controller to reduce the speed while simultaneously sending a shift process signal to the VCU to provide feedback on the current progress of the speed reduction operation. The following explanation will focus on the transmission controller as the execution entity for step S203. It should be noted that the VCU can also be used to implement this step.

[0095] It should be further explained that since the front drive motor 101 is normally in driving mode, outputting torque to drive the vehicle, the default control mode of the drive motor controller is torque control mode. In torque control mode, the drive motor controller can control the front drive motor 101 to output the corresponding torque based on user operation and current vehicle operating conditions. Therefore, before controlling the front drive motor 101 to reduce its speed, it is necessary to switch the drive motor controller from torque control mode to speed control mode to achieve speed regulation.

[0096] S203-2: When the drive motor controller is detected to have entered the speed control mode, a speed reduction request containing the target speed is sent to the drive motor controller so that the drive motor controller responds to the speed reduction request and controls the speed of the front drive motor 101 to be lower than the target speed.

[0097] In this embodiment, after the drive motor controller enters the speed control mode, the transmission controller reads the pre-stored target speed from its memory, generates a speed reduction request for the front drive motor 101 containing the target speed, and sends it to the drive motor controller. The drive motor controller parses the speed reduction request sent by the transmission controller to obtain the target speed, and then controls the front drive motor 101 to perform speed control with the target speed as the control target. After the speed of the front drive motor 101 is lower than the target speed, the transmission controller sends a speed reduction completion signal to the transmission controller, which indicates that the speed of the front drive motor 101 has been lower than the target speed. At the same time, the transmission controller will continue to send a shift process signal to the VCU to inform the VCU of the current progress of the speed reduction operation.

[0098] S203-3: When the speed of the front drive motor 101 is lower than the target speed, a speed control mode inactivation signal is sent to the drive motor controller so that the drive motor controller switches from speed control mode to torque control mode.

[0099] In this embodiment, since the transmission controller is still in the speed control mode at this time, in order to ensure that the front drive motor 101 can output torque smoothly when the vehicle switches to the series mode or other driving modes that require the front drive motor 101 to output torque, the transmission controller will also send a speed control mode inactive signal to the drive motor controller after detecting that the speed reduction operation has been completed, so that the drive motor controller switches from the speed control mode back to the torque control mode.

[0100] It should be noted that when the transmission controller detects that the speed of the front drive motor 101 is lower than the target speed, it will also send a shift process signal to the VCU indicating that the shift process has been completed. After receiving the shift process signal, the VCU determines that the entire shift process has been completed and will send a reset signal to the transmission controller and the drive motor controller to reset the transmission controller and the drive motor controller to their respective stable states, and then control the vehicle normally according to the control strategy in the pure electric rear drive mode.

[0101] In one feasible implementation, after S203, the shift control method for hybrid vehicles may further include the following steps:

[0102] S204: In response to the series mode switching command, obtain the speed difference between the front drive motor 101 and the engine 103.

[0103] In this embodiment, after the synchronizer 105 is successfully disengaged and the speed of the front drive motor 101 is controlled to be lower than the target speed, if the VCU immediately receives a series mode switching command triggered by the user or automatically triggered by the system, it will execute a preset series mode switching strategy to detect the speed difference between the front drive motor 101 and the engine 103, so as to determine that the clutch 104 meets the fast closing condition.

[0104] S205: When the speed difference is less than the target speed, determine that the clutch 104 meets the rapid closing condition.

[0105] In this embodiment, since the speed of the front drive motor 101 has been pre-controlled to be lower than the target speed, and the speed of the engine 103 is zero, the VCU will immediately determine that the clutch 104 meets the fast closing condition, and then control the clutch 104 to close quickly.

[0106] S206: If it is determined that the clutch 104 meets the conditions for rapid closing, control the clutch 104 to close rapidly so that the vehicle switches from pure electric rear-wheel drive mode to series mode.

[0107] In its implementation, after determining that the clutch 104 meets the conditions for rapid engagement, the VCU will send a clutch 104 engagement command to the transmission controller. Upon receiving this clutch 104 engagement command, the transmission controller will control the clutch 104 to complete fluid pre-charging within 150ms. After the fluid pre-charging is complete, the torque of the clutch 104 will be increased to enable rapid engagement of the clutch 104. The controller will then control the front drive motor 101 to drive the engine 103 quickly via the clutch 104, entering series mode. Once in series mode, the engine 103 will drive the front drive motor 101 to generate electricity via the clutch 104. The generated electricity will then be supplied to the rear drive motor 102 to drive the vehicle.

[0108] In this embodiment, by disengaging the synchronizer 105, the speed of the front drive motor 101 is reduced to below 50 rpm, which facilitates the rapid start of the engine 103. This makes the process of switching from pure electric four-wheel drive to pure electric rear drive and then starting the engine 103 more seamless and faster. It not only shortens the engine 103 start-up time, but also avoids the situation where the speed difference between the two ends of the clutch 104 is too high when switching to series mode, which may cause the clutch 104 to wear or even fail to switch modes.

[0109] In one feasible implementation, prior to S204, the shift control method for hybrid vehicles may further include the following steps:

[0110] S301: When the current remaining capacity of the power battery is detected to be less than the capacity threshold, a series mode switching command is triggered.

[0111] In this embodiment, the VCU will detect the current remaining capacity of the power battery in real time, and when it detects that the current remaining capacity of the power battery is less than the capacity threshold, it will automatically trigger the series mode switching command to control the vehicle to switch from pure electric rear-wheel drive mode to series mode, so that the engine 103 can be used as the power source to drive the vehicle and avoid the power battery from operating under low charge conditions.

[0112] In one example, a driver is driving the vehicle at high speed in pure electric four-wheel drive mode on a suburban or elevated road. After reaching urban roads, the driver releases the accelerator to drive at low speed. When the VCU detects that the driver's accelerator pedal opening is less than the opening threshold, it will automatically switch the vehicle's driving mode from pure electric four-wheel drive mode to pure electric rear-wheel drive mode and actively control the speed of the front drive motor 101 to be lower than the target speed. At this time, the VCU detects that the current remaining capacity of the power battery is less than the capacity threshold and will automatically trigger the series mode switching command to control the vehicle to switch from pure electric rear-wheel drive mode to series mode. Since the speed of the front drive motor 101 has been reduced in advance, the clutch can be quickly closed, and the front drive motor 101 can drive the engine 103 to start quickly, so that the vehicle can switch from pure electric rear-wheel drive mode to series mode in a shorter time.

[0113] In this embodiment, the VCU can intelligently switch the vehicle from pure electric four-wheel drive mode to pure electric rear-wheel drive mode based on the driver's operation information, and can quickly switch the vehicle from pure electric rear-wheel drive mode to series mode based on the current remaining capacity of the power battery, so that the vehicle can complete the intelligent switching between multiple driving modes more smoothly in a shorter time.

[0114] Secondly, based on the same inventive concept, and referring to... Figure 3 This application provides a shift control device 300 for a hybrid vehicle, which includes:

[0115] The first control module 301 is used to control the torque of the front drive motor 101 to decrease when the vehicle switches from pure electric four-wheel drive mode to pure electric rear drive mode, so that the torque of the front drive motor 101 meets the disengagement condition of the synchronizer 105.

[0116] The second control module 302 is used to control the synchronizer 105 to disengage when the torque of the front drive motor 101 meets the disengagement condition of the synchronizer 105.

[0117] The third control module 303 is used to control the speed of the front drive motor 101 to be lower than the target speed when the synchronizer 105 is successfully disengaged, so that the clutch 104 can meet the conditions for rapid engagement.

[0118] In one embodiment of this application, the first control module 301 includes:

[0119] The torque reduction request sending submodule is used to send a torque reduction request containing the target torque to the drive motor controller when the vehicle is detected to switch from pure electric four-wheel drive mode to pure electric rear-wheel drive mode, so that the drive motor controller responds to the torque reduction request and controls the torque of the front drive motor 101 to be lower than the target torque.

[0120] The first determining submodule is used to determine that the torque of the front drive motor 101 meets the disengagement condition of the synchronizer 105 when the torque of the front drive motor 101 is detected to be lower than the target torque.

[0121] In one embodiment of this application, the second control module 302 includes:

[0122] The synchronizer disengagement command sending submodule is used to send a synchronizer disengagement command to the transmission controller when the torque of the front drive motor 101 meets the disengagement condition of the synchronizer 105, so that the transmission controller responds to the synchronizer disengagement command and controls the synchronizer 105 to disengage.

[0123] The second determining submodule is used to determine that the synchronizer 105 has successfully disengaged when it is detected that the synchronizer 105 is in neutral.

[0124] In one embodiment of this application, the third control module 303 includes:

[0125] The activation signal sending submodule is used to send a speed control mode activation signal to the drive motor controller when the synchronizer 105 is successfully disengaged, so that the drive motor controller switches from torque control mode to speed control mode.

[0126] The speed reduction request sending submodule is used to send a speed reduction request containing the target speed to the drive motor controller when the drive motor controller is detected to enter the speed control mode, so that the drive motor controller responds to the speed reduction request and controls the speed of the front drive motor 101 to be lower than the target speed.

[0127] The inactive signal transmission submodule is used to send a speed control mode inactive signal to the drive motor controller when the speed of the front drive motor 101 is lower than the target speed, so that the drive motor controller switches from speed control mode to torque control mode.

[0128] In one embodiment of this application, the shift control device 300 for a hybrid vehicle further includes:

[0129] The acquisition module is used to control the speed of the front drive motor 101 to be lower than the target speed when the synchronizer 105 is successfully disengaged, so that the clutch 104 meets the condition for rapid engagement. After this step, in response to the series mode switching command, the module acquires the speed difference between the front drive motor 101 and the engine 103.

[0130] The determination module is used to determine whether the clutch 104 meets the rapid closing condition when the speed difference is less than the target speed.

[0131] The fourth control module is used to control the clutch 104 to close quickly when it is determined that the clutch 104 meets the conditions for rapid closing, so that the vehicle switches from pure electric rear-wheel drive mode to series mode. In series mode, the engine 103 drives the front drive motor 101 to generate electricity through the clutch 104, and the generated electricity is provided to the rear drive motor 102 to drive the vehicle.

[0132] In one embodiment of this application, the shift control device 300 for a hybrid vehicle further includes:

[0133] The instruction triggering module is used to trigger a series mode switching instruction when the current remaining capacity of the power battery is detected to be less than the capacity threshold.

[0134] It should be noted that the specific implementation of the hybrid vehicle shift control device 300 in this application embodiment refers to the specific implementation of the hybrid vehicle shift control method proposed in the first aspect of the above-mentioned application embodiment, and will not be repeated here.

[0135] Thirdly, based on the same inventive concept, and referring to... Figure 4 This application provides a shift control system for a hybrid vehicle, the system including a vehicle controller 401, a transmission controller 402, and a drive motor controller 403; wherein,

[0136] The vehicle controller 401 is used to send a torque reduction request to the drive motor controller 403 when the vehicle switches from pure electric four-wheel drive mode to pure electric rear-wheel drive mode.

[0137] The drive motor controller 403 is used to control the torque of the front drive motor 101 to decrease in response to a torque reduction request, so that the torque of the front drive motor 101 meets the disengagement condition of the synchronizer 105.

[0138] The vehicle controller 401 is also used to send a synchronizer disengagement command to the transmission controller 402 when the torque of the front drive motor 101 meets the disengagement condition of the synchronizer 105.

[0139] The transmission controller 402 is used to control the synchronizer 105 to disengage in response to the synchronizer disengagement command;

[0140] The vehicle controller 401 is also used to send a speed reduction request to the drive motor controller 403 when the synchronizer 105 is successfully disengaged;

[0141] The drive motor controller 403 is also used to control the speed of the front drive motor 101 to be lower than the target speed in response to a speed reduction request, so that the clutch 104 meets the fast closing condition.

[0142] It should be noted that the specific implementation of the hybrid vehicle shift control system of the hybrid vehicle in the embodiments of this application refers to the specific implementation of the hybrid vehicle shift control method proposed in the first aspect of the embodiments of this application, and will not be repeated here.

[0143] Fourthly, based on the same inventive concept, referring to Figure 5 This application provides a vehicle 500, including the gear shift control system for a hybrid vehicle as proposed in the third aspect of this application.

[0144] It should be noted that the specific implementation of the vehicle 500 in this application embodiment refers to the specific implementation of the hybrid vehicle shift control system proposed in the third aspect of the above-mentioned application embodiment, and will not be repeated here.

[0145] Fifthly, based on the same inventive concept, embodiments of this application provide a storage medium storing machine-executable instructions, which, when executed by a processor, implement the gear shifting control method for hybrid vehicles proposed in the first aspect of this application.

[0146] It should be noted that the specific implementation of the storage medium in the embodiments of this application refers to the specific implementation of the gear shifting control method for hybrid vehicles proposed in the first aspect of this application, and will not be repeated here.

[0147] Those skilled in the art will understand that embodiments of the present invention can be provided as methods, apparatus, or computer program products. Therefore, embodiments of the present invention can take the form of entirely hardware embodiments, entirely software embodiments, or embodiments combining software and hardware aspects. Furthermore, embodiments of the present invention can take the form of computer program products implemented on one or more computer-usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) containing computer-usable program code.

[0148] This invention is described with reference to flowchart illustrations and / or block diagrams of methods, terminal devices (systems), and computer program products according to embodiments of the invention. It will be understood that each block of the flowchart illustrations and / or block diagrams, and combinations of blocks in the flowchart illustrations and / or block diagrams, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, special-purpose computer, embedded processor, or other programmable data processing terminal device to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing terminal device, generate instructions for implementing the flowchart illustrations and / or block diagrams. Figure 1 One or more processes and / or boxes Figure 1 A device that provides the functions specified in one or more boxes.

[0149] These computer program instructions may also be stored in a computer-readable storage medium that can direct a computer or other programmable data processing terminal device to operate in a particular manner, such that the instructions stored in the computer-readable storage medium produce an article of manufacture including instruction means, which are implemented in a process Figure 1 One or more processes and / or boxes Figure 1 The function specified in one or more boxes.

[0150] These computer program instructions can also be loaded onto a computer or other programmable data processing terminal equipment, causing a series of operational steps to be performed on the computer or other programmable terminal equipment to produce a computer-implemented process, thereby providing instructions that execute on the computer or other programmable terminal equipment for implementing the process. Figure 1 One or more processes and / or boxes Figure 1 The steps of the function specified in one or more boxes.

[0151] Although preferred embodiments of the present invention have been described, those skilled in the art, upon learning the basic inventive concept, can make other changes and modifications to these embodiments. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments as well as all changes and modifications falling within the scope of the embodiments of the present invention.

[0152] Finally, it should be noted that in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or terminal device that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or terminal device. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or terminal device that includes the element.

[0153] The foregoing has provided a detailed description of the shift control method, device, system, vehicle, and storage medium for a hybrid vehicle provided by the present invention. Specific examples have been used to illustrate the principles and implementation methods of the present invention. The descriptions of the above embodiments are only for the purpose of helping to understand the method and core ideas of the present invention. At the same time, for those skilled in the art, there will be changes in the specific implementation methods and application scope based on the ideas of the present invention. Therefore, the content of this specification should not be construed as a limitation of the present invention.

Claims

1. A shift control method for a hybrid vehicle, characterized in that, The method, applied to a vehicle controller, includes: When the vehicle switches from pure electric four-wheel drive mode to pure electric rear-wheel drive mode, the torque of the front drive motor is reduced so that the torque of the front drive motor meets the synchronizer disengagement condition. When the torque of the front drive motor meets the synchronizer disengagement condition, the synchronizer is controlled to disengage. When the synchronizer is successfully disengaged, the speed of the front drive motor is controlled to be lower than the target speed so that the clutch meets the condition for rapid engagement. The step of controlling the speed of the front drive motor to be lower than the target speed when the synchronizer is successfully disengaged, so as to satisfy the condition for rapid clutch engagement, includes: When the synchronizer is successfully disengaged, a speed control mode activation signal is sent to the drive motor controller to switch the drive motor controller from torque control mode to speed control mode. When the drive motor controller is detected to have entered the speed control mode, a speed reduction request containing the target speed is sent to the drive motor controller, so that the drive motor controller responds to the speed reduction request and controls the speed of the front drive motor to be lower than the target speed; When the speed of the front drive motor is lower than the target speed, a speed control mode inactivation signal is sent to the drive motor controller so that the drive motor controller switches from the speed control mode to the torque control mode. The condition for disengaging the synchronizer is that the torque of the front drive motor is less than 1 N·m.

2. The shift control method for a hybrid vehicle according to claim 1, characterized in that, When the vehicle switches from pure electric four-wheel drive mode to pure electric rear-wheel drive mode, the step of controlling the torque of the front drive motor to decrease so that the torque of the front drive motor meets the synchronizer disengagement condition includes: When the vehicle is detected to switch from the pure electric four-wheel drive mode to the pure electric rear-wheel drive mode, a torque reduction request containing the target torque is sent to the drive motor controller, so that the drive motor controller responds to the torque reduction request and controls the torque of the front drive motor to be lower than the target torque. If the torque of the front drive motor is detected to be lower than the target torque, it is determined that the torque of the front drive motor meets the synchronizer disengagement condition.

3. The shift control method for a hybrid vehicle according to claim 1, characterized in that, When the torque of the front drive motor meets the synchronizer disengagement condition, the steps of controlling the synchronizer to disengage include: When the torque of the front drive motor meets the synchronizer disengagement condition, a synchronizer disengagement command is sent to the transmission controller so that the transmission controller responds to the synchronizer disengagement command and controls the synchronizer to disengage. If the synchronizer is detected to be in neutral, it is determined that the synchronizer has been successfully disengaged.

4. The shift control method for a hybrid vehicle according to claim 1, characterized in that, After the synchronizer is successfully disengaged, and the speed of the front drive motor is controlled to be lower than the target speed so that the clutch meets the condition for rapid engagement, the method further includes: In response to the series mode switching command, the speed difference between the front drive motor and the engine is obtained; If the speed difference is less than the target speed, it is determined that the clutch meets the rapid closing condition; If the clutch meets the rapid engagement condition, the clutch is controlled to engage rapidly so that the vehicle switches from the pure electric rear-wheel drive mode to the series mode. In the series mode, the engine drives the front-drive motor to generate electricity through the clutch, and the generated electricity is provided to the rear-drive motor to drive the vehicle.

5. The shift control method for a hybrid vehicle according to claim 4, characterized in that, Prior to the step of acquiring the speed difference between the front drive motor and the engine in response to the series mode switching command, the method further includes: If the current remaining capacity of the power battery is detected to be less than the capacity threshold, the series mode switching command is triggered.

6. A shift control device for a hybrid vehicle, characterized in that, The device includes: The first control module is used to control the torque of the front drive motor to decrease when the vehicle switches from pure electric four-wheel drive mode to pure electric rear drive mode, so that the torque of the front drive motor meets the synchronizer disengagement condition. The second control module is used to control the synchronizer to disengage when the torque of the front drive motor meets the synchronizer disengagement condition. The third control module is used to control the speed of the front drive motor to be lower than the target speed when the synchronizer is successfully disengaged, so that the clutch meets the condition for rapid engagement. The third control module includes: The activation signal sending submodule is used to send a speed control mode activation signal to the drive motor controller when the synchronizer is successfully disengaged, so that the drive motor controller switches from torque control mode to speed control mode. The speed reduction request sending submodule is used to send a speed reduction request containing the target speed to the drive motor controller when the drive motor controller is detected to enter the speed control mode, so that the drive motor controller responds to the speed reduction request and controls the speed of the front drive motor to be lower than the target speed. The inactive signal transmission submodule is used to send a speed control mode inactive signal to the drive motor controller when the speed of the front drive motor is lower than the target speed, so that the drive motor controller switches from speed control mode to torque control mode. The condition for disengaging the synchronizer is that the torque of the front drive motor is less than 1 N·m.

7. A shift control system for a hybrid vehicle, characterized in that, The system includes a vehicle controller, a transmission controller, and a drive motor controller; wherein... The vehicle controller is used to send a torque reduction request to the drive motor controller when the vehicle switches from pure electric four-wheel drive mode to pure electric rear-wheel drive mode. The drive motor controller is used to respond to the torque reduction request by controlling the torque of the front drive motor to decrease so that the torque of the front drive motor meets the synchronizer disengagement condition. The vehicle controller is also used to send a synchronizer disengagement command to the transmission controller when the torque of the front drive motor meets the synchronizer disengagement condition. The transmission controller is used to control the synchronizer to disengage in response to the synchronizer disengagement command; The vehicle controller is also used to send a speed reduction request to the drive motor controller when the synchronizer is successfully disengaged; The drive motor controller is also configured to, in response to the speed reduction request, control the speed of the front drive motor to be lower than the target speed so that the clutch meets the rapid engagement condition.

8. A vehicle, characterized in that, Including the gear shift control system for hybrid vehicles as described in claim 7.

9. A storage medium, characterized in that, The storage medium stores machine-executable instructions, which, when executed by a processor, implement the gear shifting control method for a hybrid vehicle as described in any one of claims 1-5.

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