CN114791039A - Gear shifting control method and device for rear axle gearbox and vehicle - Google Patents
Gear shifting control method and device for rear axle gearbox and vehicle Download PDFInfo
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- CN114791039A CN114791039A CN202110097446.0A CN202110097446A CN114791039A CN 114791039 A CN114791039 A CN 114791039A CN 202110097446 A CN202110097446 A CN 202110097446A CN 114791039 A CN114791039 A CN 114791039A
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16H—GEARING
- F16H61/00—Control functions within control units of change-speed- or reversing-gearings for conveying rotary motion ; Control of exclusively fluid gearing, friction gearing, gearings with endless flexible members or other particular types of gearing
- F16H61/04—Smoothing ratio shift
- F16H61/0403—Synchronisation before shifting
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16H—GEARING
- F16H61/00—Control functions within control units of change-speed- or reversing-gearings for conveying rotary motion ; Control of exclusively fluid gearing, friction gearing, gearings with endless flexible members or other particular types of gearing
- F16H61/04—Smoothing ratio shift
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- Mechanical Engineering (AREA)
- Hybrid Electric Vehicles (AREA)
- Control Of Transmission Device (AREA)
Abstract
The disclosure relates to a gear shifting control method and device for a rear axle gearbox and a vehicle. The rear axle gearbox is of a multi-gear structure. The method comprises the following steps: the hybrid controller HCU judges whether the gears of the rear axle gearbox need to be converted or not; if the gear of the rear axle gearbox needs to be switched from the current gear to the target gear, the HCU sends a mode switching instruction to the motor controller MCU; if a mode conversion instruction is received, the MCU is converted into a mode for controlling the rotating speed of the rear axle motor in a rotating speed control mode so as to enable the rear axle motor and the shaft of the rear axle gearbox to be mechanically synchronous; if the shafts of the rear axle motor and the rear axle gearbox are mechanically synchronous on the rotating speed corresponding to the target gear, the gear shift controller ACU controls the gear of the rear axle gearbox to be converted to the target gear; the ACU sends a gear shifting completion message to the MCU; and if the gear shifting completion message is received, the MCU is converted into a torque control mode to control the rear axle motor to run. The method provided by the disclosure improves the acceleration performance of the whole vehicle.
Description
Technical Field
The disclosure relates to the field of control of hybrid vehicles, in particular to a gear shifting control method and device for a rear axle gearbox and a vehicle.
Background
With the increasing requirement for environmental friendliness, vehicles using clean energy such as pure electric vehicles and hybrid vehicles are increasingly researched and applied. In some hybrid vehicles, the front axle carries a high-voltage Belt-Driven Starter Generator (BSG), and the rear axle carries a high-voltage drive motor. The main functions of the BSG motor are engine starting, power generation, power assist, and energy recovery, and the main function of the rear axle motor is to provide power assist to the rear axle.
The basic functions of the motor are realized by controlling the torque of the motor, and the motor is controlled by controlling the torque of the motor. In addition, the rear axle transmission is usually of a single-gear structure, i.e., includes two gears, namely, neutral and 1-gear.
Disclosure of Invention
The invention aims to provide a gear shifting control method and device for a rear axle gearbox and a vehicle when the rear axle gearbox is of a multi-gear structure.
In order to achieve the above object, the present disclosure provides a shift control method of a rear axle transmission case, the rear axle transmission case being of a multi-gear structure, the method including:
the hybrid controller HCU judges whether the gears of the rear axle gearbox need to be converted or not;
if the gear of the rear axle gearbox needs to be switched from the current gear to the target gear, the HCU sends a mode switching instruction to the motor controller MCU;
if the mode conversion instruction is received, the MCU converts the rotation speed of the rear axle motor into a rotation speed control mode to control the rotation speed of the rear axle motor so as to enable the shafts of the rear axle motor and the rear axle gearbox to be mechanically synchronous;
if the shafts of the rear axle motor and the rear axle gearbox are mechanically synchronous on the rotating speed corresponding to the target gear, the gear shift controller ACU controls the gear of the rear axle gearbox to be converted to the target gear;
if the gear of the rear axle gearbox is switched to the target gear, the ACU sends a gear shifting completion message to the MCU;
and if the gear shifting completion message is received, the MCU is converted into a torque control mode to control the rear axle motor to operate.
Optionally, the hybrid controller HCU determining whether the gears of the rear axle transmission need to be switched includes:
the HCU monitors the speed of the vehicle;
and if the monitored vehicle speed reaches the vehicle speed corresponding to the target gear, the HCU judges that the gear of the rear axle gearbox needs to be converted from the current gear to the target gear.
Optionally, if the mode conversion instruction is received, the MCU converts the mode conversion instruction into a mode for controlling the rotation speed of the rear axle motor in a rotation speed control mode, including:
if the mode conversion instruction is received, the MCU controls to reduce the torque of the rear axle motor;
and if the torque of the rear axle motor is reduced to zero, the MCU is converted into the rotation speed of the rear axle motor controlled by the rotation speed control mode.
Optionally, if the torque of the rear axle motor is reduced to zero, the MCU is switched to control the rotation speed of the rear axle motor in the rotation speed control mode, which includes:
if the torque of the rear axle motor is reduced to zero, the MCU sends a gear shifting request to the HCU;
if the gear shifting request is received, the HCU sends a gear shifting command to the ACU;
if the gear shifting instruction is received, the ACU controls the rear axle gearbox to be separated from the current gear and sends a mode switching request to the MCU;
and if the mode conversion request is received, the MCU converts the rotation speed into the rotation speed of the rear axle motor controlled by the rotation speed control mode.
Optionally, the MCU converts to control the rotation speed of the rear axle motor in a rotation speed control mode, so as to mechanically synchronize the shafts of the rear axle motor and the rear axle gearbox, including:
the MCU is converted into a mode of controlling the rotating speed of a rear axle motor in a rotating speed control mode, the rear axle motor is controlled to operate at the rotating speed corresponding to the target gear, and the real-time rotating speed of the rear axle motor is sent to the ACU;
and the ACU controls the shaft of the rear axle gearbox and the rear axle motor to be mechanically synchronous.
Optionally, the method further comprises:
and if the gear of the rear axle gearbox is converted to the target gear, the ACU sends the gear shifting completion message to the HCU.
The present disclosure still further provides a shift control device of a rear axle transmission, the rear axle transmission being a multi-gear structure, the device comprising:
the hybrid controller HCU is used for judging whether the gears of the rear axle gearbox need to be converted or not, and sending a mode conversion instruction to the motor controller MCU if the gears of the rear axle gearbox need to be converted from the current gear to the target gear;
the MCU is used for converting the mode into a mode of controlling the rotating speed of a rear axle motor in a rotating speed control mode if the mode conversion instruction is received so as to enable the shafts of the rear axle motor and the rear axle gearbox to be mechanically synchronous;
the gear shifting controller ACU is used for controlling the gear of the rear axle gearbox to be converted to the target gear if the shafts of the rear axle motor and the rear axle gearbox are mechanically synchronous on the rotating speed corresponding to the target gear, and sending a gear shifting completion message to the MCU if the gear of the rear axle gearbox is converted to the target gear;
and the MCU is also used for converting the shifting into a torque control mode to control the operation of the rear axle motor if the shifting completion message is received.
Optionally, the HCU is further configured to:
monitoring the speed of the vehicle;
and if the monitored vehicle speed reaches the vehicle speed corresponding to the target gear, judging that the gear of the rear axle gearbox needs to be converted from the current gear to the target gear.
Optionally, the MCU is further configured to:
if the mode conversion instruction is received, controlling to reduce the torque of the rear axle motor;
and if the torque of the rear axle motor is reduced to zero, the rotation speed of the rear axle motor is controlled in the rotation speed control mode.
Optionally, the MCU is further configured to send a shift request to the HCU if the torque of the rear axle motor decreases to zero;
the HCU is further used for sending a gear shifting command to the ACU if the gear shifting request is received;
the ACU is further used for controlling the rear axle gearbox to be separated from the current gear and sending a mode switching request to the MCU if the gear shifting instruction is received;
and the MCU is also used for converting the mode into the rotating speed of the rear axle motor controlled by the rotating speed control mode if the mode conversion request is received.
Optionally, the MCU is further configured to convert the rotation speed of the rear axle motor into a rotation speed control mode, control the rear axle motor to operate at a rotation speed corresponding to the target gear, and send the real-time rotation speed of the rear axle motor to the ACU;
the ACU is also used for controlling the shaft of the rear axle gearbox and the rear axle motor to be mechanically synchronous.
Optionally, the ACU is further configured to send the shift completion message to the HCU if the gear of the rear axle transmission is shifted to the target gear.
The present disclosure also provides a vehicle including a rear axle drive motor and a control device of the above-mentioned rear axle drive motor provided by the present disclosure.
According to the technical scheme, the gear shifting control method and the gear shifting control device are applied to the rear axle gearbox with the multi-gear structure, when the gear speed ratio of the rear driving shaft cannot meet the requirement of the vehicle speed, the gear is shifted up by converting the torque control mode into the rotating speed control mode, the rotating speed ratio is improved, the vehicle speed is further improved continuously, and the acceleration performance of the whole vehicle is improved.
Additional features and advantages of the present disclosure will be set forth in the detailed description which follows.
Drawings
The accompanying drawings, which are included to provide a further understanding of the disclosure and are incorporated in and constitute a part of this specification, illustrate embodiments of the disclosure and together with the description serve to explain the disclosure without limiting the disclosure. In the drawings:
FIG. 1 is a flowchart of a method of shift control of a rear axle transmission provided in an exemplary embodiment;
FIG. 2 is a signaling diagram of a shift control method for a rear axle transmission provided in another exemplary embodiment;
fig. 3 is a block diagram of a shift control device of a rear axle transmission provided in an exemplary embodiment.
Detailed Description
The following detailed description of the embodiments of the disclosure refers to the accompanying drawings. It should be understood that the detailed description and specific examples, while indicating the present disclosure, are given by way of illustration and explanation only, not limitation.
In the related art, a rear axle gearbox of the new energy vehicle is in a single-gear structure, and a motor with a P4 framework cannot perform matching operation of gear shifting, and is in a single-gear control mode. The inventor envisions that the rear axle gearbox may be configured in a multi-speed configuration, and when a higher vehicle speed is required and the speed ratio of the rear drive axle is not able to meet the vehicle speed requirement, an upshift may be made so that the vehicle speed may continue to be increased after the speed ratio is increased. Therefore, the gear shifting method of the rear axle driving motor and the rear axle gearbox which are matched with each other provided by the inventor solves the requirement of high speed, and improves the acceleration performance of the whole vehicle at high speed.
FIG. 1 is a flowchart of a method for shift control of a rear axle transmission provided in an exemplary embodiment. The rear axle gearbox is of a multi-gear structure. As shown in fig. 1, the method includes the following steps.
Step S11, a Hybrid Control Unit (HCU) determines whether a shift of the rear axle transmission needs to be converted.
Step S12, if it is determined that the shift position of the rear axle transmission needs to be changed from the current shift position to the target shift position, the HCU sends a mode change command to a Motor Control Unit (MCU).
In step S13, if the mode switching command is received, the MCU switches to control the rotation speed of the rear axle motor in the rotation speed control mode so that the shafts of the rear axle motor and the rear axle transmission are mechanically synchronized.
In step S14, if the shafts of the rear axle motor and the rear axle transmission are mechanically synchronized at the rotation speed corresponding to the target gear, the gear shift controller (ACU) controls the gear of the rear axle transmission to be shifted to the target gear.
And step S15, if the gear of the rear axle gearbox is switched to the target gear, the ACU sends a gear shifting completion message to the MCU.
In step S16, if the shift completion message is received, the MCU switches to control the operation of the rear axle motor in the torque control mode.
The rotation speed control mode is a control mode aiming at controlling the rotation speed of the rear axle motor, and the torque control mode is a control mode aiming at controlling the torque of the rear axle motor. When the gear is not shifted, the MCU controls the operation of the rear axle motor in a torque control mode, and in the gear shifting process, the MCU controls the operation of the rear axle motor in a rotating speed control mode.
The MCU may target a rotation speed corresponding to the target gear, i.e., control the rear axle motor to gradually reach the rotation speed. For example, the target gear is gear 2, and gear 2 corresponds to a rotation speed of 3000 rpm. The MCU can control the rear axle motor to gradually reach 3000rpm and send the real-time rotating speed to the ACU, and the ACU controls the transmission case to be mechanically synchronized with the rear axle motor and then controls the transmission case to be converted into a target gear.
The MCU, HCU and ACU CAN communicate with each other via a CAN bus in the vehicle. The rotational speed control accuracy requirement may be: when the rotating speed is less than 6000rpm, taking +/-30 rpm; when the rotation speed is more than or equal to 6000rpm, the rotation speed is within plus or minus 0.5 percent.
According to the technical scheme, the gear shifting control method and the gear shifting control device are applied to the rear axle gearbox with the multi-gear structure, when the gear speed ratio of the rear driving shaft cannot meet the requirement of the vehicle speed, the gear is shifted up by converting the torque control mode into the rotating speed control mode, the rotating speed ratio is improved, the vehicle speed is further improved continuously, and the acceleration performance of the whole vehicle is improved.
In another embodiment, the HCU determining whether the gears of the rear axle transmission need to be shifted in step S11 includes: the HCU monitors the speed of the vehicle; and if the monitored vehicle speed reaches the vehicle speed corresponding to the target gear, the HCU judges that the gear of the rear axle gearbox needs to be converted from the current gear to the target gear.
That is, it is determined whether or not a shift is required according to the vehicle speed. For example, the rear axle gearbox may comprise 1 st gear, 2 nd gear and neutral gear, when the vehicle speed is below 120km/h, 1 st gear may be maintained, when the vehicle speed reaches 120km/h, a gear shift operation may be triggered, and the target gear is 2 nd gear.
In the embodiment, whether gear shifting is needed or not is determined according to the vehicle speed, the method is simple and direct, and efficient gear shifting is facilitated, so that the acceleration performance of the whole vehicle is improved.
In another embodiment, if the mode switching command is received in step S13, the switching the MCU to control the rotation speed of the rear axle motor in the rotation speed control mode may include: if a mode conversion instruction is received, the MCU controls to reduce the torque of the rear axle motor; if the torque of the rear axle motor is reduced to zero, the MCU is converted into a rotation speed control mode to control the rotation speed of the rear axle motor.
That is, when it is determined that the gear is to be shifted, the torque of the rear axle motor is reduced to zero, and then the rear axle motor enters a rotation speed control mode, so that the control of the rotation speed is started under the condition that the rear axle motor is not controlled by the torque at all, the accurate control of the rotation speed is facilitated, and the gear shifting is smoother.
In another embodiment, if the torque of the rear axle motor is reduced to zero, the MCU may be switched to control the rotation speed of the rear axle motor in the rotation speed control mode, and the switching may include:
if the torque of the rear axle motor is reduced to zero, the MCU sends a gear shifting request to the HCU;
if the gear shifting request is received, the HCU sends a gear shifting command to the ACU;
if a gear shifting instruction is received, the ACU controls the rear axle gearbox to be separated from the current gear and sends a mode conversion request to the MCU;
and if the mode conversion request is received, the MCU is converted into the rotating speed of the rear axle motor controlled in the rotating speed control mode.
That is, the MCU sends a message to the ACU through the HCU, which is advantageous to integrally coordinate various states of the vehicle in the HCU to ensure smooth execution of gear shifting. If the situation that the gear shifting is not suitable occurs, the HCU does not send a gear shifting command to the ACU, and the safety of the vehicle is guaranteed.
In another embodiment, the MCU of step S13 configured to control the rotational speed of the rear axle motor in a rotational speed control mode so as to mechanically synchronize the shafts of the rear axle motor and the rear axle gearbox may include:
the MCU is converted into a mode for controlling the rotating speed of the rear axle motor in a rotating speed control mode, the rear axle motor is controlled to operate at the rotating speed corresponding to the target gear, and the real-time rotating speed of the rear axle motor is sent to the ACU;
and the ACU controls the shaft of the rear axle gearbox to be mechanically synchronous with the rear axle motor.
That is, the MCU actively controls the rear axle motor to synchronize with the target rotational speed corresponding to the target gear, the ACU controls the rear axle transmission to achieve rotational speed synchronization with the rear axle motor, and the gear of the rear axle transmission is conveniently controlled to switch to the target gear after synchronization. The rotating speed corresponding to the target gear can be sent to the MCU by the ACU in advance, or the MCU searches the rotating speed according to the corresponding relation between the target gear and the prestored gear.
In the embodiment, the mechanical synchronization is achieved by adopting the MCU initiative and ACU following modes, the strategy is simple, and the operability is strong.
In yet another embodiment, the method further comprises: and if the gear of the rear axle gearbox is converted to the target gear, the ACU sends a gear shifting completion message to the HCU.
If the MCU previously sent a shift request to the HCU and the HCU sent a shift command to the ACU, the HCU may be considered to allow the ACU to shift gears through communication with the MCU. If the target gear has been shifted, the ACU sending a shift complete message to the HCU may indicate that the ACU is no longer shifting gears via communication with the MCU until the next time the HCU sends a shift command to the ACU. Therefore, the gear shifting safety is further ensured, and the driving safety of the whole vehicle is improved.
FIG. 2 is a signaling diagram of a shift control method for a rear axle transmission provided in another exemplary embodiment. In the embodiment of fig. 2, technical features of the above embodiments are included and will not be described in detail here.
The present disclosure also provides a shift control device of a rear axle gearbox. FIG. 3 is a block diagram of a shift control device for a rear axle transmission provided in an exemplary embodiment. The rear axle gearbox is of a multi-gear structure. As shown in fig. 3, a shift control device 300 of a rear axle transmission case may include a MCU 301, a HCU 302, and an ACU 303.
The HCU 302 is configured to determine whether a gear of the rear axle transmission needs to be switched, and send a mode switching instruction to the MCU 301 if it is determined that the gear of the rear axle transmission needs to be switched from the current gear to the target gear.
The MCU 301 is configured to, if receiving a mode switching command, switch to control the rotational speed of the rear axle motor in a rotational speed control mode, so as to mechanically synchronize the shafts of the rear axle motor and the rear axle gearbox.
The ACU 303 is configured to control the gear of the rear axle transmission to be switched to the target gear if the shafts of the rear axle motor and the rear axle transmission are mechanically synchronized at the rotation speed corresponding to the target gear, and send a gear shifting completion message to the MCU 301 if the gear of the rear axle transmission is switched to the target gear.
The MCU 301 is also configured to switch to controlling the operation of the rear axle motor in the torque control mode if a shift complete message is received.
Optionally, the HCU may also be used to: monitoring the speed of the vehicle; and if the monitored vehicle speed reaches the vehicle speed corresponding to the target gear, judging that the gear of the rear axle gearbox needs to be converted from the current gear to the target gear.
Optionally, the MCU may also be configured to: if a mode conversion instruction is received, controlling to reduce the torque of a rear axle motor; and if the torque of the rear axle motor is reduced to zero, the rotation speed of the rear axle motor is controlled in a rotation speed control mode.
Optionally, the MCU may also be configured to send a shift request to the HCU if the torque of the rear axle motor falls to zero; the HCU is also used for sending a gear shifting command to the ACU if the gear shifting request is received; the ACU is also used for controlling the rear axle gearbox to be separated from the current gear and sending a mode conversion request to the MCU if a gear shifting instruction is received; and the MCU is also used for converting the mode into the rotating speed for controlling the rear axle motor in a rotating speed control mode if the mode conversion request is received.
Optionally, the MCU may also be configured to convert the rotation speed of the rear axle motor into a rotation speed control mode, control the rear axle motor to operate at a rotation speed corresponding to the target gear, and send the real-time rotation speed of the rear axle motor to the ACU; the ACU is also used to control the mechanical synchronization of the rear axle gearbox shaft and the rear axle motor.
Optionally, the ACU may also be configured to send a shift complete message to the HCU if the gear of the rear axle transmission is shifted to the target gear.
With regard to the apparatus in the above-described embodiment, the specific manner in which each module performs the operation has been described in detail in the embodiment related to the method, and will not be elaborated here.
According to the technical scheme, the gear shifting control method and the gear shifting control device are applied to the rear axle gearbox with the multi-gear structure, when the gear speed ratio of the rear driving shaft cannot meet the requirement of the vehicle speed, the gear shifting is carried out by converting the torque control mode into the rotating speed control mode, the rotating speed ratio is improved, the vehicle speed is further improved continuously, and the acceleration performance of the whole vehicle is improved.
The present disclosure also provides a vehicle including a rear axle drive motor and the control device 300 of the rear axle drive motor provided by the present disclosure.
The preferred embodiments of the present disclosure are described in detail above with reference to the accompanying drawings, however, the present disclosure is not limited to the specific details in the above embodiments, and various simple modifications may be made to the technical solution of the present disclosure within the technical idea of the present disclosure, and these simple modifications all belong to the protection scope of the present disclosure.
It should be noted that the various features described in the above embodiments may be combined in any suitable manner without departing from the scope of the invention. To avoid unnecessary repetition, the disclosure does not separately describe various possible combinations.
In addition, any combination of various embodiments of the present disclosure may be made, and the same should be considered as the disclosure of the present disclosure as long as it does not depart from the gist of the present disclosure.
Claims (13)
1. A shift control method of a rear axle transmission, characterized in that the rear axle transmission is of a multi-speed structure, the method comprising:
the hybrid controller HCU judges whether the gears of the rear axle gearbox need to be converted or not;
if the gear of the rear axle gearbox needs to be switched from the current gear to the target gear, the HCU sends a mode switching instruction to the motor controller MCU;
if the mode conversion instruction is received, the MCU converts the rotation speed of the rear axle motor into a rotation speed control mode to control the rotation speed of the rear axle motor so as to enable the shafts of the rear axle motor and the rear axle gearbox to be mechanically synchronous;
if the shafts of the rear axle motor and the rear axle gearbox are mechanically synchronous on the rotating speed corresponding to the target gear, the gear shift controller ACU controls the gear of the rear axle gearbox to be converted to the target gear;
if the gear of the rear axle gearbox is switched to the target gear, the ACU sends a gear shifting completion message to the MCU;
and if the gear shifting completion message is received, the MCU is converted into a torque control mode to control the rear axle motor to operate.
2. The method of claim 1, wherein the hybrid controller HCU determining whether a gear shift of the rear axle transmission is required comprises:
the HCU monitors the speed of the vehicle;
and if the monitored vehicle speed reaches the vehicle speed corresponding to the target gear, the HCU judges that the gear of the rear axle gearbox needs to be converted from the current gear to the target gear.
3. The method of claim 1, wherein if the mode switching command is received, the MCU switches to control the rotational speed of the rear axle motor in a rotational speed control mode, comprising:
if the mode conversion instruction is received, the MCU controls to reduce the torque of the rear axle motor;
and if the torque of the rear axle motor is reduced to zero, the MCU is converted into the rotation speed of the rear axle motor controlled by the rotation speed control mode.
4. The method of claim 3, wherein if the torque of the rear axle motor drops to zero, the MCU transitions to controlling the speed of the rear axle motor in the speed control mode, comprising:
if the torque of the rear axle motor is reduced to zero, the MCU sends a gear shifting request to the HCU;
if the gear shifting request is received, the HCU sends a gear shifting command to the ACU;
if the gear shifting instruction is received, the ACU controls the rear axle gearbox to be separated from the current gear and sends a mode switching request to the MCU;
and if the mode conversion request is received, the MCU converts the rotation speed into the rotation speed of the rear axle motor controlled by the rotation speed control mode.
5. The method of claim 1, wherein the MCU is switched to control the speed of a rear axle motor in a speed control mode to mechanically synchronize the shafts of the rear axle motor and the rear axle gearbox, comprising:
the MCU is converted into a rotating speed control mode for controlling the rotating speed of a rear axle motor, controlling the rear axle motor to operate at a rotating speed corresponding to the target gear, and sending the real-time rotating speed of the rear axle motor to the ACU;
and the ACU controls the shaft of the rear axle gearbox and the rear axle motor to be mechanically synchronous.
6. The method of claim 1, further comprising:
and if the gear of the rear axle gearbox is converted to the target gear, the ACU sends the gear shifting completion message to the HCU.
7. A shift control device of a rear axle transmission, characterized in that the rear axle transmission is of a multi-gear structure, the device comprising:
the hybrid controller HCU is used for judging whether the gear of the rear axle gearbox needs to be switched or not, and sending a mode switching instruction to the motor controller MCU if the gear of the rear axle gearbox needs to be switched from the current gear to the target gear;
the MCU is used for converting the mode conversion instruction into a mode for controlling the rotating speed of the rear axle motor in a rotating speed control mode if the mode conversion instruction is received so as to enable the rear axle motor and the shaft of the rear axle gearbox to be mechanically synchronous;
the gear shifting controller ACU is used for controlling the gear of the rear axle gearbox to be switched to the target gear if the shafts of the rear axle motor and the rear axle gearbox are mechanically synchronous on the rotating speed corresponding to the target gear, and sending a gear shifting completion message to the MCU if the gear of the rear axle gearbox is switched to the target gear;
and the MCU is also used for switching to control the operation of the rear axle motor in a torque control mode if the gear shifting completion message is received.
8. The apparatus of claim 7, wherein the HCU is further configured to:
monitoring the speed of the vehicle;
and if the monitored vehicle speed reaches the vehicle speed corresponding to the target gear, judging that the gear of the rear axle gearbox needs to be switched from the current gear to the target gear.
9. The apparatus of claim 7, wherein the MCU is further configured to:
if the mode conversion instruction is received, controlling to reduce the torque of the rear axle motor;
and if the torque of the rear axle motor is reduced to zero, the rotation speed of the rear axle motor is controlled in the rotation speed control mode.
10. The apparatus of claim 9,
the MCU is also used for sending a gear shifting request to the HCU if the torque of the rear axle motor is reduced to zero;
the HCU is further used for sending a gear shifting command to the ACU if the gear shifting request is received;
the ACU is further used for controlling the rear axle gearbox to be separated from the current gear and sending a mode switching request to the MCU if the gear shifting instruction is received;
and the MCU is also used for converting the mode into the rotating speed of the rear axle motor controlled by the rotating speed control mode if the mode conversion request is received.
11. The apparatus of claim 7,
the MCU is also used for converting the rotating speed into a rotating speed control mode for controlling a rear axle motor, controlling the rear axle motor to operate at a rotating speed corresponding to the target gear, and sending the real-time rotating speed of the rear axle motor to the ACU;
the ACU is also used for controlling the shaft of the rear axle gearbox and the rear axle motor to be mechanically synchronous.
12. The apparatus of claim 7,
the ACU is further configured to send the gear shift completion message to the HCU if the gear of the rear axle transmission is switched to the target gear.
13. A vehicle characterized by comprising a rear axle drive motor and a control device of the rear axle drive motor according to any one of claims 7-12.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110097446.0A CN114791039B (en) | 2021-01-25 | 2021-01-25 | Gear shifting control method and device for rear axle gearbox and vehicle |
| PCT/CN2022/071383 WO2022156564A1 (en) | 2021-01-25 | 2022-01-11 | Gear shift control method and apparatus for rear axle gearbox, and vehicle |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110097446.0A CN114791039B (en) | 2021-01-25 | 2021-01-25 | Gear shifting control method and device for rear axle gearbox and vehicle |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN114791039A true CN114791039A (en) | 2022-07-26 |
| CN114791039B CN114791039B (en) | 2023-09-15 |
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| CN202110097446.0A Active CN114791039B (en) | 2021-01-25 | 2021-01-25 | Gear shifting control method and device for rear axle gearbox and vehicle |
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| CN (1) | CN114791039B (en) |
| WO (1) | WO2022156564A1 (en) |
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| CN102815301A (en) * | 2012-08-16 | 2012-12-12 | 重庆长安汽车股份有限公司 | Method and system for cruise control for pure electric vehicle |
| CN204222624U (en) * | 2014-11-10 | 2015-03-25 | 于军 | A kind of rear-axle drive system of electronlmobil |
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| JP3506227B2 (en) * | 2000-02-18 | 2004-03-15 | 日産自動車株式会社 | Driving force distribution control device for four-wheel drive vehicles |
| CN101323302B (en) * | 2007-07-31 | 2011-06-22 | 北京理工大学 | Non-clutch shift control method and control system of pure electric vehicle |
| CN103600670B (en) * | 2013-11-25 | 2017-04-05 | 北京中瑞蓝科电动汽车技术有限公司 | A kind of AMT types pure electric vehicle gear-shifting control method |
| CN110065489B (en) * | 2019-04-30 | 2020-05-22 | 苏州赫行新能源汽车科技有限公司 | Dual-motor hybrid power system for high-power heavy truck and control method thereof |
| CN112303223B (en) * | 2020-10-29 | 2022-01-11 | 重庆长安汽车股份有限公司 | Method for controlling rear axle clutch of hybrid electric vehicle |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20080070745A1 (en) * | 2006-09-20 | 2008-03-20 | Makoto Ogata | Gear shift control device for a hybrid electric vehicle |
| CN102815301A (en) * | 2012-08-16 | 2012-12-12 | 重庆长安汽车股份有限公司 | Method and system for cruise control for pure electric vehicle |
| CN204222624U (en) * | 2014-11-10 | 2015-03-25 | 于军 | A kind of rear-axle drive system of electronlmobil |
| CN107128210A (en) * | 2016-02-29 | 2017-09-05 | 陕西汽车集团有限责任公司 | Pure electric vehicle whole-control system containing two-shift automatic variable speed |
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| CN114791039B (en) | 2023-09-15 |
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