Method and device for controlling mode switching of hybrid electric vehicle, and vehicle

1 . A method for controlling mode switching of a hybrid electric vehicle, comprising:

acquiring, though a vehicle control unit, a current drive state information of the hybrid electric vehicle;

performing, through a processor, if the current drive state information indicates that a current drive mode of the hybrid electric vehicle is a forward mode of a non-hybrid drive mode and in a case that a current speed reaches a speed limit, a pre-gear operation when a transmission gear of the hybrid electric vehicle is a neutral gear, to switch the transmission gear from the neutral gear to a second gear; and

switching, though a transmission control unit, if the current drive state information meets preset switching conditions of drive modes, the hybrid electric vehicle from the non-hybrid drive mode to a hybrid drive mode when the transmission gear of the hybrid electric vehicle is the second gear;

wherein the speed limit is determined by:

acquiring a preset maximum speed difference in a synchronizer of the hybrid electric vehicle, wherein the preset maximum speed difference is a limit to a speed difference at both ends of the synchronizer, and the preset maximum speed difference is defined by an ability of the synchronizer; and

setting the speed limit according to the preset maximum speed difference, such that when a vehicle speed of the hybrid electric vehicle reaches the speed limit, a speed difference at both ends of the synchronizer is less than the preset maximum speed difference;

wherein the hybrid electric vehicle comprises the transmission control unit, a synchronizer electrically connected with the transmission control unit, and a clutch electrically connected with the transmission control unit; and

the pre-gear operation allows the vehicle to perform the pre-gear operation when the vehicle reaches the speed limit, and when the vehicle speed is higher than the speed limit and the vehicle is necessary to switch to the hybrid power drive mode, the synchronizer has been in gear, and the clutch can be directly engaged.

2 . The method according to claim 1 , further comprising:

performing, through the transmission control unit, if the current drive state information indicates that the current drive mode of the hybrid electric vehicle is the hybrid drive mode and a current speed of the hybrid electric vehicle is less than the speed limit, a reverse gear operation when the transmission gear of the hybrid electric vehicle is the second gear, to switch the transmission gear from the second gear to the neutral gear.

3 . The method according to claim 1 , wherein the hybrid electric vehicle comprises the transmission control unit and an electronic stability program, and the step of acquiring the current drive state information of the hybrid electric vehicle comprising:

determining a current drive mode of the hybrid electric vehicle and a gear information under the current drive mode according to an electric signal of the transmission control unit; and

determining a current vehicle speed and a current vehicle demand power of the hybrid electric vehicle according to an electric signal of the electronic stability program, wherein the drive state information comprises the current drive mode, the gear information, the current vehicle speed and the current vehicle demand power, and the current vehicle demand power is configured to determine whether a current vehicle needs to switch to the hybrid drive mode;

wherein the switching conditions of drive modes are that the drive state information indicates that the hybrid electric vehicle is in the forward mode of the non-hybrid drive mode, a current vehicle speed is in a preset speed range, and a current vehicle demand power is in an economic operation range.

4 . The method according to claim 1 , wherein the hybrid electric vehicle comprises an electronic stability program, and the step of performing a pre-gear operation comprises:

sending a pre-gear command to the transmission control unit, wherein the pre-gear command is configured to instruct the transmission control unit to control the synchronizer to perform the pre-gear operation.

5 . The method according to claim 4 , further comprising:

re-sending the pre-gear command to the transmission control unit when a gear failure message sent by the transmission control unit in response to the pre-gear command is received.

6 . The method according to claim 1 , wherein the step of switching the hybrid electric vehicle from the non-hybrid drive mode to the hybrid drive mode comprises:

sending a mode switching command to the transmission control unit, wherein the mode switching command is configured to instruct the transmission control unit to control an engagement of a clutch with an engine of the hybrid electric vehicle to complete an operation of switching from a pure electric drive mode or a series drive mode to a hybrid electric drive mode.

7 . A device for controlling mode switching of a hybrid electric vehicle, the device comprising:

an acquisition module, configured for acquiring, through a vehicle control unit, a current drive state information of the hybrid electric vehicle;

a processing module, configured for performing, through a processor, if the current drive state information indicates that a current drive mode of the hybrid electric vehicle is a forward mode of a non-hybrid drive mode and in a case that a current speed reaches a speed limit, a pre-gear operation when a transmission gear of the hybrid electric vehicle is a neutral gear, to switch the transmission gear from the neutral gear to a second gear; and

a switching module, configured for switching, through a transmission control unit, if the current drive state information meets preset switching conditions of drive modes, the hybrid electric vehicle from the non-hybrid drive mode to a hybrid drive mode when the transmission gear of the hybrid electric vehicle is the second gear;

wherein the speed limit is determined by:

acquiring a preset maximum speed difference in a synchronizer of the hybrid electric vehicle, wherein the preset maximum speed difference is a limit to a speed difference at both ends of the synchronizer, and the preset maximum speed difference is defined by an ability of the synchronizer; and

setting the speed limit according to the preset maximum speed difference, such that when a vehicle speed of the hybrid electric vehicle reaches the speed limit, a speed difference at both ends of the synchronizer is less than the preset maximum speed difference;

wherein the hybrid electric vehicle comprises the transmission control unit, a synchronizer electrically connected with the transmission control unit, and a clutch electrically connected with the transmission control unit; and

the pre-gear operation allows the vehicle to perform the pre-gear operation when the vehicle reaches the speed limit, and when the vehicle speed is higher than the speed limit and the vehicle is necessary to switch to the hybrid power drive mode, the synchronizer has been in gear, and the clutch can be directly engaged.

8 . The device according to claim 7 , wherein the transmission control unit is further configured for:

performing, if the current drive state information indicates that the current drive mode of the hybrid electric vehicle is the hybrid drive mode and a current speed of the hybrid electric vehicle is less than the speed limit, a reverse gear operation when the transmission gear of the hybrid electric vehicle is the second gear, to switch the transmission gear from the second gear to the neutral gear.

9 . The device according to claim 7 , wherein the hybrid electric vehicle comprises an electronic stability program, and the vehicle control unit is further configured for:

determining a current drive mode of the hybrid electric vehicle and a gear information under the current drive mode according to an electric signal of the transmission control unit; and

determining a current vehicle speed and a current vehicle demand power of the hybrid electric vehicle according to an electric signal of the electronic stability program, wherein the current drive state information comprises the current drive mode, the gear information, the current vehicle speed and the current vehicle demand power, and the current vehicle demand power is configured to determine whether a current vehicle needs to switch to the hybrid drive mode;

wherein the switching conditions of drive modes are that the current drive state information indicates that the hybrid electric vehicle is in the forward mode of the non-hybrid drive mode, a current vehicle speed is in a preset speed range, and a current vehicle demand power is in an economic operation range.

10 . The device according to claim 7 , the hybrid electric vehicle comprises an electronic stability program, and the processor is configured for:

sending a pre-gear command to the transmission control unit, wherein the pre-gear command is configured to instruct the transmission control unit to control the synchronizer to perform the pre-gear operation.

11 . The device according to claim 10 , wherein the processor is further configured for:

re-sending the pre-gear command to the transmission control unit when a gear failure message sent by the transmission control unit in response to the pre-gear command is received.

12 . The device according to claim 7 , wherein the transmission control unit is configured for:

sending a mode switching command to the transmission control unit, wherein the mode switching command is configured to instruct the transmission control unit to control an engagement of the clutch with an engine of the hybrid electric vehicle to complete an operation of switching from a pure electric drive mode or a series drive mode to a hybrid electric drive mode.

13 . A hybrid electric vehicle, comprising: a transmission control unit, an electronic stability program and a device for controlling mode switching electrically connected with the transmission control unit and the electronic stability program, and the device for controlling mode switching is configured for implementing a method comprising:

acquiring, though a vehicle control unit, a current drive state information of the hybrid electric vehicle;

performing, through a transmission control unit, if the current drive state information indicates that a current drive mode of the hybrid electric vehicle is a forward mode of a non-hybrid drive mode and in a case that a current speed reaches a speed limit, a pre-gear operation when a transmission gear of the hybrid electric vehicle is a neutral gear, to switch the transmission gear from the neutral gear to a second gear; and

switching, though the vehicle control unit, if the current drive state information meets preset switching conditions of drive modes, the hybrid electric vehicle from the non-hybrid drive mode to a hybrid drive mode when the transmission gear of the hybrid electric vehicle is the second gear;

wherein the speed limit is determined by:

acquiring a preset maximum speed difference in a synchronizer of the hybrid electric vehicle, wherein the preset maximum speed difference is a limit to a speed difference at both ends of the synchronizer, and the preset maximum speed difference is defined by an ability of the synchronizer; and

setting the speed limit according to the preset maximum speed difference, such that when a vehicle speed of the hybrid electric vehicle reaches the speed limit, a speed difference at both ends of the synchronizer is less than the preset maximum speed difference;

wherein the hybrid electric vehicle comprises the transmission control unit, a synchronizer electrically connected with the transmission control unit, and a clutch electrically connected with the transmission control unit; and

the pre-gear operation allows the vehicle to perform the pre-gear operation when the vehicle reaches the speed limit, and when the vehicle speed is higher than the speed limit and the vehicle is necessary to switch to the hybrid power drive mode, the synchronizer has been in gear, and the clutch can be directly engaged.

14 . The method according to claim 2 , wherein the hybrid electric vehicle comprises and the step of performing a pre-gear operation comprising:

sending a pre-gear command to the transmission control unit, wherein the pre-gear command is configured to instruct the transmission control unit to control the synchronizer to perform the pre-gear operation.

15 . The method according to claim 3 , wherein the hybrid electric vehicle comprises an electronic stability program, and the step of performing a pre-gear operation comprising:

sending a pre-gear command to the transmission control unit, wherein the pre-gear command is configured to instruct the transmission control unit to control the synchronizer to perform the pre-gear operation.

16 . The method according to claim 2 , wherein the step of switching the hybrid electric vehicle from a non-hybrid drive mode to a hybrid drive mode comprising:

sending a mode switching command to the transmission control unit, wherein the mode switching command is configured to instruct the transmission control unit to control an engagement of the clutch with an engine of the hybrid electric vehicle to complete an operation of switching from a pure electric drive mode or a series drive mode to a hybrid electric drive mode.