CN110645350A - Pure electric vehicle speed reducer control method - Google Patents
Pure electric vehicle speed reducer control method Download PDFInfo
- Publication number
- CN110645350A CN110645350A CN201910898584.1A CN201910898584A CN110645350A CN 110645350 A CN110645350 A CN 110645350A CN 201910898584 A CN201910898584 A CN 201910898584A CN 110645350 A CN110645350 A CN 110645350A
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- Prior art keywords
- vehicle
- controller
- gear
- rotating speed
- motor
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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
- F16H61/02—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 characterised by the signals used
- F16H61/0202—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 characterised by the signals used the signals being electric
- F16H61/0204—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 characterised by the signals used the signals being electric for gearshift control, e.g. control functions for performing shifting or generation of shift signal
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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
- F16H59/00—Control inputs to control units of change-speed-, or reversing-gearings for conveying rotary motion
- F16H59/14—Inputs being a function of torque or torque demand
- F16H59/24—Inputs being a function of torque or torque demand dependent on the throttle opening
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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
- F16H59/00—Control inputs to control units of change-speed-, or reversing-gearings for conveying rotary motion
- F16H59/36—Inputs being a function of speed
- F16H59/44—Inputs being a function of speed dependent on machine speed of the machine, e.g. the vehicle
Abstract
The invention discloses a pure electric vehicle speed reducer control method, wherein a pure electric vehicle comprises a vehicle control unit, a gearbox controller, a microcontroller, a mechanical automatic transmission and a motor; the motor adopts a low-power motor; the mechanical automatic transmission adopts a two-gear mechanical automatic transmission; when the vehicle runs in different rotating speed ranges, the rotating speed of the motor is maintained in a reasonable range when the motor meets the power required by the vehicle running through the gear switching of the mechanical automatic transmission. By adopting the technical scheme, the control of the low-power motor and the two-gear AMT power assembly is realized through an optimization strategy, when the vehicle runs in different rotating speed ranges, the motor is maintained in a reasonable rotating speed range by switching gears when the running requirement of the vehicle is met, the purposes of reducing the cost and improving the endurance mileage are achieved, and particularly the endurance mileage of the electric vehicle running at high speed is improved; and has no influence on the service life of the battery.
Description
Technical Field
The invention belongs to the technical field of pure electric vehicle application, and particularly relates to a pure electric vehicle speed reducer control method.
Background
The new energy automobile is used as an important development strategy of the country, but is influenced by cost and endurance mileage, so that the advantages of the new energy automobile are not obvious compared with those of the traditional fuel oil automobile.
The mainstream technology of the power assembly of the pure electric passenger vehicle at present: the motor + a fixed speed ratio reducer. However, the single-stage speed regulator must simultaneously give consideration to the maximum climbing gradient and the maximum speed of the vehicle, and requires a large motor torque and a high rotating speed, which results in high vehicle cost; and when the vehicle runs at a high speed, the rotating speed of the motor is required to be higher, the efficient area of the motor cannot be effectively utilized, and the endurance mileage is influenced.
Disclosure of Invention
The invention provides a pure electric vehicle speed reducer control method, and aims to reduce cost, improve endurance mileage and not influence the service life of a battery.
In order to achieve the purpose, the invention adopts the technical scheme that:
the pure electric vehicle speed reducer control method comprises a vehicle control unit, a gearbox controller, a microcontroller, a mechanical automatic transmission and a motor; the motor adopts a low-power motor; the mechanical automatic transmission adopts a two-gear mechanical automatic transmission; when the vehicle runs in different rotating speed ranges, the rotating speed of the motor is maintained in a reasonable range when the motor meets the power required by the vehicle running through the gear switching of the mechanical automatic transmission.
The control strategy of the control method is as follows:
1. the vehicle controller judges whether the transmission controller is allowed to carry out gear-up or gear-down operation according to the fact that the vehicle is free of faults and the charging power is larger than the generating power;
2. after the vehicle controller judges that the vehicle is finished, a signal for allowing gear up or gear down and a vehicle driving mode signal are sent to a transmission controller;
3. the gearbox controller judges whether upshifting or downshifting can be carried out according to the driving mode, the vehicle speed and the accelerator opening;
4. if the gear-up or gear-down can be carried out, the gearbox controller sends a gear-up or gear-down request to the vehicle controller;
5. the vehicle control unit controls the microcontroller to unload the torque, and the microcontroller sends a torque signal to the vehicle control unit and the gearbox controller in real time;
6. the gear-shifting box controller performs gear shifting when judging that the torque is 0;
7. after gear disengagement is completed, the transmission controller sends a gear disengagement completion signal and a target rotating speed to the whole vehicle controller;
8. the finished vehicle controller controls the microcontroller to reduce the rotating speed to a target rotating speed, and the microcontroller sends the rotating speed to the gearbox controller and the finished vehicle controller in real time;
9. the vehicle control unit or the gearbox controller judges that the rotating speed reaches the target rotating speed and then prepares for synchronization;
10. the transmission controller sends a preparation synchronization signal to the vehicle control unit;
11. the vehicle control unit controls the microcontroller to unload the torque, and the microcontroller sends a torque signal to the vehicle control unit and the gearbox controller in real time;
12. the gear is engaged when the torque is judged to be 0 by the gearbox controller;
13. the transmission controller sends a gear engaging completion signal to the vehicle control unit;
14. and the vehicle control unit performs torque recovery according to the request of the driver.
And the battery management system of the pure electric vehicle sends the information of the current charging power to the gearbox controller.
By adopting the technical scheme, the control of the low-power motor and the two-gear AMT power assembly is realized through an optimization strategy, when the vehicle runs in different rotating speed ranges, the motor is maintained in a reasonable rotating speed range by switching gears when the vehicle running requirement is met, the purposes of reducing the cost and improving the endurance mileage are achieved, and particularly the endurance mileage of the electric vehicle running at high speed is improved; and has no influence on the service life of the battery.
Drawings
Fig. 1 is a schematic structural diagram of a control strategy according to the present invention.
Detailed Description
The following detailed description of the embodiments of the present invention will be given in order to provide those skilled in the art with a more complete, accurate and thorough understanding of the inventive concept and technical solutions of the present invention.
The meanings of abbreviations in the present invention:
VCU-vehicle control Unit;
TCU-Transmission controller;
MCU-microcontroller (interface circuit connection control in various peripheral circuits of the automobile);
BMS — battery management system;
AMT-automatic mechanical transmission.
Fig. 1 shows a pure electric vehicle retarder control method according to the present invention. The pure electric vehicle comprises a Vehicle Control Unit (VCU), a Transmission Control Unit (TCU), a Microcontroller (MCU), an Automatic Mechanical Transmission (AMT), a motor and a Battery Management System (BMS).
In order to solve the problems in the prior art, overcome the defects and achieve the purposes of reducing the cost and improving the endurance mileage, the invention adopts the technical scheme that:
as shown in the figure, the pure electric automobile speed reducer control method is characterized in that the motor adopts a low-power motor; the AMT adopts a two-gear mechanical automatic transmission; when the vehicle runs in different rotating speed ranges, the rotating speed is maintained in a reasonable range when the motor meets the power required by the running of the vehicle through the switching of the gears of the AMT.
According to the invention, through optimizing strategy control, the pure electric vehicle is controlled by using a low-power motor and a two-gear AMT power assembly, and the purposes of reducing cost, improving endurance mileage and having no influence on the service life of a battery are achieved. The dynamic property of the speed reducer reaches a high-power motor and a fixed speed ratio speed reducer, namely, the effect of reducing the cost is achieved by using a low-power motor.
The control strategy of the control method is as follows:
1. the VCU judges whether the TCU is allowed to carry out gear-up or gear-down operation according to the fact that the whole vehicle has no fault and the charging power is larger than the generating power;
2. after the VCU judges that the vehicle is finished, the VCU sends a signal for allowing the gear to be shifted up or shifted down and a vehicle driving mode signal to the TCU;
3. the TCU judges whether the upshift or the downshift can be carried out according to the driving mode, the vehicle speed and the accelerator opening;
4. if the upshift or downshift can be performed, the TCU sends an upshift or downshift request to the VCU;
5. the VCU controls the MCU to unload the torque, and the MCU sends a torque signal to the VCU and the TCU in real time;
6. the TCU performs gear disengagement when judging that the torque is 0;
7. after the gear-off is finished, the TCU sends a gear-off finishing signal and a target rotating speed to the VCU;
8. the VCU controls the MCU to reduce the rotating speed to a target rotating speed, and the MCU sends the rotating speed to the TCU and the VCU in real time;
9. VCU or TCU judges that the rotating speed is ready for synchronization after reaching the target rotating speed;
10. the TCU sends a preparation synchronization signal to the VCU;
11. the VCU controls the MCU to unload the torque, and the MCU sends a torque signal to the VCU and the TCU in real time;
12. the TCU performs gear engagement when judging that the torque is 0;
13. the TCU sends a gear engaging completion signal to the VCU;
14. the VCU performs torque recovery based on the driver request.
The control strategy of the invention is as follows:
by adopting the technical scheme, when the vehicle runs in different rotating speed ranges, the motor is maintained in a reasonable rotating speed range when the vehicle running requirement is met through switching of gears, and the endurance mileage of the electric vehicle running at high speed is improved. Meanwhile, the pure electric vehicle is controlled through a strategy to use the low-power motor and the two-gear AMT power assembly, the situation that the power generation power is larger than the battery charging power when the gear is shifted is avoided, and the service life of the battery cannot be influenced.
And the battery management system of the pure electric vehicle sends the information of the current charging power to the TCU.
The invention has been described above with reference to the accompanying drawings, it is obvious that the invention is not limited to the specific implementation in the above-described manner, and it is within the scope of the invention to apply the inventive concept and solution to other applications without substantial modification.
Claims (3)
1. A pure electric vehicle speed reducer control method is disclosed, wherein the pure electric vehicle comprises a vehicle control unit, a gearbox controller, a microcontroller, a mechanical automatic transmission and a motor, and is characterized in that: the motor adopts a low-power motor; the mechanical automatic transmission adopts a two-gear mechanical automatic transmission; when the vehicle runs in different rotating speed ranges, the rotating speed of the motor is maintained in a reasonable range when the motor meets the power required by the vehicle running through the gear switching of the mechanical automatic transmission.
2. The pure electric vehicle speed reducer control method according to claim 1, characterized in that: the control strategy of the control method is as follows:
1) the vehicle controller judges whether the transmission controller is allowed to carry out gear-up or gear-down operation according to the fact that the vehicle is free of faults and the charging power is larger than the generating power;
2) after the vehicle controller judges that the vehicle is finished, the vehicle controller sends a signal for allowing gear up or gear down and a vehicle driving mode signal to the transmission controller;
3) judging whether the gear can be shifted up or down by the gearbox controller according to the driving mode, the vehicle speed and the accelerator opening;
4) if the vehicle can be shifted up or down, the transmission controller sends a shift-up or shift-down request to the vehicle controller;
5) the whole vehicle controller controls the microcontroller to unload the torque, and the microcontroller sends a torque signal to the whole vehicle controller and the gearbox controller in real time;
6) when the torque is judged to be 0 by the gearbox controller, gear shifting is carried out;
7) after gear disengagement is finished, the transmission controller sends a gear disengagement finishing signal and a target rotating speed to the whole vehicle controller;
8) the whole vehicle controller controls the microcontroller to reduce the rotating speed to a target rotating speed, and the microcontroller sends the rotating speed to the gearbox controller and the whole vehicle controller in real time;
9) the vehicle control unit or the gearbox controller judges that the rotating speed reaches the target rotating speed and then prepares for synchronization;
10) the transmission controller sends a preparation synchronization signal to the vehicle control unit;
11) the whole vehicle controller controls the microcontroller to unload the torque, and the microcontroller sends a torque signal to the whole vehicle controller and the gearbox controller in real time;
12) when the torque is judged to be 0 by the gearbox controller, gear engagement is carried out;
13) the transmission controller sends a gear engaging completion signal to the vehicle control unit;
14) and the vehicle control unit recovers the torque according to the request of the driver.
3. The pure electric vehicle speed reducer control method according to claim 1, characterized in that: and the battery management system of the pure electric vehicle sends the information of the current charging power to the gearbox controller.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910898584.1A CN110645350A (en) | 2019-09-23 | 2019-09-23 | Pure electric vehicle speed reducer control method |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910898584.1A CN110645350A (en) | 2019-09-23 | 2019-09-23 | Pure electric vehicle speed reducer control method |
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| CN110645350A true CN110645350A (en) | 2020-01-03 |
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| CN201910898584.1A Pending CN110645350A (en) | 2019-09-23 | 2019-09-23 | Pure electric vehicle speed reducer control method |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114562559A (en) * | 2022-03-23 | 2022-05-31 | 广汽埃安新能源汽车有限公司 | Neutral gear control method and device for two-gear motor, electronic equipment and storage medium |
| CN114562559B (en) * | 2022-03-23 | 2024-04-26 | 广汽埃安新能源汽车有限公司 | Neutral gear control method and device of two-gear motor, electronic equipment and storage medium |
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| CN103723142A (en) * | 2012-10-15 | 2014-04-16 | 北汽福田汽车股份有限公司 | Battery electric vehicle and start control method thereof |
| CN105972199A (en) * | 2016-07-13 | 2016-09-28 | 北京理工华创电动车技术有限公司 | Clutch-free AMT control system and method |
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| CN106926747A (en) * | 2017-02-15 | 2017-07-07 | 同济大学 | Pure electric automobile shifting control system based on no-clutch two-shift automatic speed variator |
| CN107117160A (en) * | 2017-03-10 | 2017-09-01 | 北京理工大学 | A kind of drive system of electric automobile and control method |
| CN110155030A (en) * | 2019-05-28 | 2019-08-23 | 奇瑞汽车股份有限公司 | Two gear transmission control systems of one kind and method |
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2019
- 2019-09-23 CN CN201910898584.1A patent/CN110645350A/en active Pending
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102887149A (en) * | 2012-09-27 | 2013-01-23 | 重庆长安汽车股份有限公司 | Automatic variable speed control system of pure electric vehicle and pure electric vehicle |
| CN103723142A (en) * | 2012-10-15 | 2014-04-16 | 北汽福田汽车股份有限公司 | Battery electric vehicle and start control method thereof |
| CN105972199A (en) * | 2016-07-13 | 2016-09-28 | 北京理工华创电动车技术有限公司 | Clutch-free AMT control system and method |
| CN106114493A (en) * | 2016-07-28 | 2016-11-16 | 长春孔辉汽车科技股份有限公司 | A kind of electric automobile AMT shift process control method |
| CN106926747A (en) * | 2017-02-15 | 2017-07-07 | 同济大学 | Pure electric automobile shifting control system based on no-clutch two-shift automatic speed variator |
| CN107117160A (en) * | 2017-03-10 | 2017-09-01 | 北京理工大学 | A kind of drive system of electric automobile and control method |
| CN110155030A (en) * | 2019-05-28 | 2019-08-23 | 奇瑞汽车股份有限公司 | Two gear transmission control systems of one kind and method |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114562559A (en) * | 2022-03-23 | 2022-05-31 | 广汽埃安新能源汽车有限公司 | Neutral gear control method and device for two-gear motor, electronic equipment and storage medium |
| CN114562559B (en) * | 2022-03-23 | 2024-04-26 | 广汽埃安新能源汽车有限公司 | Neutral gear control method and device of two-gear motor, electronic equipment and storage medium |
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Application publication date: 20200103 |