Search

EP-4520605-B1 - METHOD AND APPARATUS FOR CONTROLLING GEAR SHIFTING OF HYBRID ELECTRIC VEHICLE, AND STORAGE MEDIUM

EP4520605B1EP 4520605 B1EP4520605 B1EP 4520605B1EP-4520605-B1

Inventors

  • Wang, Qinglai
  • QI, Keguang
  • TAO, CHENG
  • LI, DEYU
  • LIANG, Zhenyang
  • GAO, LIJUAN

Dates

Publication Date
20260506
Application Date
20230926

Claims (15)

  1. A method for controlling gear shifting of a hybrid electric vehicle, being applied to a transmission control unit (TCU) (1) connected to a vehicle control unit (VCU) (2), wherein the VCU (2) is connected to a first microcontroller unit (MCU) (31) of an integrated starter generator (ISG) (3), a second MCU (41) of a traction motor (TM) (4), and a clutch (5), the method comprises: determining (201), in response to a received vehicle state transmitted by the VCU (2) being a braking state or a sliding state, a first target torque value; transmitting (202), once at an interval of a preset time period and via the VCU (2), a first torque control instruction to the first MCU (31) and a second torque control instruction to the second MCU (41) based on the first target torque value, wherein the first torque control instruction comprises a torque control mode and a first torque value, the second torque control instruction comprises a torque control mode and a second torque value, and a sum of the first torque value and the second torque value transmitted each time is equal to the first target torque value; transmitting (203), in response to a difference between a received rotational speed of the ISG (3) that is transmitted by the VCU (2) and a received rotational speed of the clutch (5) being within a preset speed difference range and via the VCU (2), a rotational speed control instruction to the first MCU (31) and a gear shift instruction to the second MCU (41), wherein the rotational speed control instruction comprises a rotational speed control mode and a target rotational speed; and transmitting (204), in response to receiving a TM (4) gear-shifting completion instruction transmitted by the VCU (2), once at an interval of a preset time period and via the VCU (2), a third torque control instruction to the first MCU (31) and a fourth torque control instruction to the second MCU (41) based on the first target torque value, wherein the third torque control instruction comprises a torque control mode and a third torque value, the fourth torque control instruction comprises a torque control mode and a fourth torque value, and a sum of the third torque value and the fourth torque value transmitted each time is equal to the first target torque value.
  2. The method for controlling gear shifting of the hybrid electric vehicle according to claim 1, wherein a difference between first torque values contained in two adjacent first torque control instructions transmitted to the first MCU (31) via the VCU (2) is a same as a difference between second torque values contained in corresponding second torque control instructions transmitted to the second MCU (41).
  3. The method for controlling gear shifting of the hybrid electric vehicle according to claim 1, wherein said transmitting, via the VCU (2), the first torque control instruction to the first MCU (31) and the second torque control instruction to the second MCU (41) comprises: transmitting the first target torque value as the first torque value in the first torque control instruction transmitted to the first MCU (31) via the VCU (2), and transmitting 0 as the second torque value in the second torque control instruction transmitted to the second MCU (41) via the VCU (2).
  4. The method for controlling gear shifting of the hybrid electric vehicle according to claim 1, wherein said transmitting, via the VCU (2), the third torque control instruction to the first MCU (31) and the fourth torque control instruction to the second MCU (41) comprises: transmitting 0 as the third torque value in the third torque control instruction transmitted to the first MCU (31) via the VCU (2), and transmitting the first target torque value as the fourth torque value in the fourth torque control instruction transmitted to the second MCU (41) via the VCU (2).
  5. The method for controlling gear shifting of the hybrid electric vehicle according to claim 1, further comprising: transmitting, via the VCU (2), a first pressure instruction to the clutch (5) while transmitting, via the VCU (2), the first torque control instruction to the first MCU (31) and the second torque control instruction to the second MCU (41), wherein the first pressure instruction comprises a first pressure value, a first pressure value in a current first pressure instruction being greater than a first pressure value in a previous first pressure instruction.
  6. The method for controlling gear shifting of the hybrid electric vehicle according to claim 1, further comprising: transmitting, via the VCU (2), a second pressure instruction to the clutch (5) while transmitting, via the VCU (2), the rotational speed control instruction to the first MCU (31) and the gear shift instruction to the second MCU (41), wherein the second pressure instruction comprises a second pressure value.
  7. The method for controlling gear shifting of the hybrid electric vehicle according to claim 6, further comprising: determining a second target torque value in a case that the difference between the received rotational speed of the ISG (3) that is transmitted by the VCU (2) and the received rotational speed of the clutch (5) being within the preset speed difference range and in response to the received vehicle state transmitted by the VCU (2) being an acceleration state; transmitting, once at an interval of the preset time period and via the VCU (2), a fifth torque control instruction to the first MCU (31) and the second pressure instruction to the clutch (5) based on the second target torque value, wherein the fifth torque control instruction comprises a torque control mode and a fifth torque value, and along with an increase of a quantity of transmitting times, a value of the fifth torque value is first decreased and then increased; and transmitting, in response to a received torque value of the ISG (3) that is transmitted by the VCU (2) being the second target torque value, once at an interval of the preset time period, a fourth pressure instruction to the clutch (5), wherein the fourth pressure instruction comprises a fourth pressure value, a fourth pressure value in a current fourth pressure instruction being less than a fourth pressure value in a previous fourth pressure instruction.
  8. The method for controlling gear shifting of the hybrid electric vehicle according to claim 1, further comprising: transmitting, via the VCU (2), a third pressure instruction to the clutch (5) while transmitting, via the VCU (2), the third torque control instruction to the first MCU (31) and the fourth torque control instruction to the second MCU (41), wherein the third pressure instruction comprises a third pressure value, a third pressure value in a current third pressure instruction being less than a third pressure value in a previous third pressure instruction.
  9. The method for controlling gear shifting of the hybrid electric vehicle according to claim 1, wherein the rotational speed control mode is implemented by proportional-integral-derivative (PID) control; and the preset speed difference range is 200 rmp to 400 rmp.
  10. An apparatus for controlling gear shifting of a hybrid electric vehicle, comprising: a first torque value determining module (501), configured to determine, in response to a received vehicle state transmitted by a vehicle control unit (VCU) being a braking state or a sliding state, a first target torque value; a first instruction transmitting module (502), configured to transmit, once at an interval of a preset time period and via the VCU, a first torque control instruction to a first microcontroller unit (MCU) and a second torque control instruction to a second MCU based on the first target torque value, wherein the first torque control instruction comprises a torque control mode and a first torque value, the second torque control instruction comprises a torque control mode and a second torque value, and a sum of the first torque value and the second torque value transmitted each time is equal to the first target torque value; a second instruction transmitting module (503), configured to transmit, in response to a difference between a received rotational speed of an integrated starter generator (ISG) that is transmitted by the VCU and a received rotational speed of a clutch being within a preset speed difference range and via the VCU, a rotational speed control instruction to the first MCU and a gear shift instruction to the second MCU, wherein the rotational speed control instruction comprises a rotational speed control mode and a target rotational speed; and a third instruction transmitting module (504), configured to transmit, in response to receiving a traction motor (TM) gear-shifting completion instruction transmitted by the VCU, once at an interval of the preset time period and via the VCU, a third torque control instruction to the first MCU and a fourth torque control instruction to the second MCU based on the first target torque value, wherein the third torque control instruction comprises a torque control mode and a third torque value, the fourth torque control instruction comprises a torque control mode and a fourth torque value, and a sum of the third torque value and the fourth torque value transmitted each time is equal to the first target torque value.
  11. The apparatus for controlling gear shifting of the hybrid electric vehicle according to claim 10, wherein a difference between first torque values contained in two adjacent first torque control instructions transmitted to the first MCU via the VCU is a same as a difference between second torque values contained in corresponding second torque control instructions transmitted to the second MCU.
  12. The apparatus for controlling gear shifting of the hybrid electric vehicle according to claim 10, wherein the first instruction transmitting module (502) is specifically configured to: transmit the first target torque value as the first torque value in the first torque control instruction transmitted to the first MCU via the VCU, and transmit 0 as the second torque value in the second torque control instruction transmitted to the second MCU via the VCU.
  13. The apparatus for controlling gear shifting of the hybrid electric vehicle according to claim 10, wherein the third instruction transmitting module (504) is specifically configured to: transmit 0 as the third torque value in the third torque control instruction transmitted to the first MCU via the VCU, and transmit the first target torque value as the fourth torque value in the fourth torque control instruction transmitted to the second MCU via the VCU.
  14. The apparatus for controlling gear shifting of the hybrid electric vehicle according to claim 10, further comprising: a forth instruction transmitting module, configured to transmit, via the VCU, a first pressure instruction to the clutch while transmitting, via the VCU, the first torque control instruction to the first MCU and the second torque control instruction to the second MCU, wherein the first pressure instruction comprises a first pressure value, a first pressure value in a current first pressure instruction being greater than a first pressure value in a previous first pressure instruction.
  15. A non-transitory computer-readable storage medium storing at least one computer instruction, wherein the computer at least one instruction, when loaded and executed by a processor, causes the processor to perform the method for controlling gear shifting of the hybrid electric vehicle as defined in any one of claims 1 to 9.

Description

TECHNICAL FIELD The present disclosure relates to the field of vehicle electric control technology, and in particular, relates to a method and apparatus for controlling gear shifting of a hybrid electric vehicle, and a storage medium. BACKGROUND With a series of social problems brought by the continuous increase in vehicle ownership, the depletion of fossil energy, and the deterioration of the atmospheric environment, the state has successively issued policies to encourage and require the development of new energy vehicles. However, pure electric new energy vehicles are affected by subjective and objective factors such as inconvenient charging and short range, which bring poor practical experience to users. Hybrid electric vehicles, which are also in the field of new energy vehicles, have gradually gained popularity in the market due to their superior energy saving and emission reduction as well as better user experience. SUMMARY In view of the above, the present disclosure provides a method and apparatus for controlling gear shifting of a hybrid electric vehicle, and a storage medium. Specifically, the present disclosure includes the following technical solution. In a first aspect, embodiments of the present disclosure provide a method for controlling gear shifting of a hybrid electric vehicle. The method is applied to a transmission control unit (TCU) connected to a vehicle control unit (VCU), wherein the VCU is connected to a first microcontroller unit (MCU) of an integrated starter generator (ISG), a second MCU of a traction motor (TM), and a clutch, and the method includes: determining, in response to a received vehicle state transmitted by the VCU being a braking state or a sliding state, a first target torque value;transmitting, once at an interval of a preset time period and via the VCU, a first torque control instruction to the first MCU and a second torque control instruction to the second MCU based on the first target torque value, wherein the first torque control instruction includes a torque control mode and a first torque value, the second torque control instruction includes a torque control mode and a second torque value, and a sum of the first torque value and the second torque value transmitted each time is equal to the first target torque value;transmitting, in response to a difference between a received rotational speed of the ISG that is transmitted by the VCU and a received rotational speed of the clutch being within a preset speed difference range and via the VCU, a rotational speed control instruction to the first MCU and a gear shift instruction to the second MCU, wherein the rotational speed control instruction includes a rotational speed control mode and a target rotational speed; andtransmitting, in response to receiving a TM gear-shifting completion instruction transmitted by the VCU, once at an interval of a preset time period and via the VCU, a third torque control instruction to the first MCU and a fourth torque control instruction to the second MCU based on the first target torque value, wherein the third torque control instruction includes a torque control mode and a third torque value, the fourth torque control instruction includes a torque control mode and a fourth torque value, and a sum of the third torque value and the fourth torque value transmitted each time is equal to the first target torque value. In some embodiments, a difference between first torque values contained in two adjacent first torque control instructions transmitted to the first MCU via the VCU is the same as a difference between second torque values contained in corresponding second torque control instructions transmitted to the second MCU. In some embodiments, transmitting, via the VCU, the first torque control instruction to the first MCU and the second torque control instruction to the second MCU, includes: transmitting the first target torque value as the first torque value in the first torque control instruction transmitted to the first MCU via the VCU, and transmitting 0 as the second torque value in the second torque control instruction transmitted to the second MCU via the VCU. In some embodiments, transmitting, via the VCU, the third torque control instruction to the first MCU and the fourth torque control instruction to the second MCU, includes: transmitting 0 as the third torque value in the third torque control instruction transmitted to the first MCU via the VCU, and transmitting the first target torque value as the fourth torque value in the fourth torque control instruction transmitted to the second MCU via the VCU. In some embodiments, the method further includes: transmitting, via the VCU, a first pressure instruction to the clutch while transmitting, via the VCU, the first torque control instruction to the first MCU and the second torque control instruction to the second MCU, wherein the first pressure instruction includes a first pressure value, a first pressure value in a current f