CN113983155B - Method for determining required torque at engine end of vehicle - Google Patents
Method for determining required torque at engine end of vehicle Download PDFInfo
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- CN113983155B CN113983155B CN202111270974.8A CN202111270974A CN113983155B CN 113983155 B CN113983155 B CN 113983155B CN 202111270974 A CN202111270974 A CN 202111270974A CN 113983155 B CN113983155 B CN 113983155B
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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
- F16H59/02—Selector apparatus
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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
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Abstract
The invention discloses a method for determining the required torque at the engine end of a vehicle, which comprises the following steps: determining an actual torque transmission ratio N; according to vehicle state and actual torqueGear ratio N determines a virtual gear ratio Nvir; determining wheel end torque T CW And using the formula: t is ENG =T CW Div Nvir, calculating the engine end torque demand T ENG . The virtual transmission ratio is introduced in the accelerator stepping and gear-up process, and the actual torque transmission ratio is not used as a calculation factor of the engine end required torque, so that the calculated engine end required torque is more reasonable, the condition that the engine torque is increased excessively in the accelerator stepping and gear-up process can be avoided, the gear-shifting quality is improved, and the oil consumption is reduced.
Description
Technical Field
The invention belongs to the field of transmissions, and particularly relates to a method for determining a required torque at an engine end of a vehicle.
Background
CN108533739A discloses a method and device for shifting gears of automatic transmission vehicle, describing: when the vehicle needs to shift gears, the gearbox controller calculates a target gear according to the real-time vehicle speed and the position of an accelerator pedal, and the gearbox controller calculates an actual torque transmission ratio according to the target gear, the current gear and the torque distribution of the two clutches; when the vehicle does not need to shift gears, the gearbox controller takes the torque transmission ratio of the current gear as the actual torque transmission ratio; when the real-time vehicle speed does not reach the vehicle speed at the gear shifting point, the gearbox controller uses the torque transmission ratio of the current gear as the torque transmission ratio and sends the obtained torque transmission ratio to the engine controller, and the engine controller calculates the real-time output torque (namely the torque required by the engine end) required by the engine according to the actual torque transmission ratio and the required wheel torque. The method is characterized in that the actual torque transmission ratio is directly used as a calculation factor of the engine end required torque, and in the process of stepping on the accelerator and shifting up, if an engine controller calculates the engine end required torque according to the actual torque transmission ratio, the engine end required torque is larger, the situation of excessive engine torque increment occurs, and the problems of difficult gear shifting quality matching and high oil consumption are caused.
Disclosure of Invention
The invention aims to provide a method for determining the required torque at the engine end of a vehicle, so as to avoid the situation of excessive increase of the torque of an engine in the process of stepping on an accelerator to upshift, improve the gear shifting quality and reduce the oil consumption.
The invention discloses a method for determining the torque required by a vehicle engine end, which comprises the following steps:
determining an actual torque transmission ratio N;
determining a virtual transmission ratio Nvir according to the vehicle state and the actual torque transmission ratio N;
determining wheel end torque T CW And using the formula: t is ENG =T CW Div Nvir, calculating the engine end torque demand T ENG ；
Wherein the step of determining the virtual gear ratio Nvir from the vehicle state and the actual torque gear ratio N comprises:
s1, judging whether the vehicle state is in the process of stepping on the accelerator and upshifting, if so, executing S2, otherwise, executing S10;
s2, enabling the lower limit Nlow of the transmission ratio to = Nactg multiplied by A, and then executing S3; wherein Nactg represents the transmission ratio when the current gear transmission is locked, and A represents a virtual transmission ratio multiple;
s3, judging whether the actual torque transmission ratio N is larger than or equal to a transmission ratio lower limit Nlow, if so, executing S4, otherwise, executing S5;
s4, enabling the virtual transmission ratio Nvir = N, and then ending;
s5, starting timing by the timer, and then executing S6;
s6, judging whether the vehicle state is in the process of stepping on the accelerator and upshifting, if so, executing S7, otherwise, executing S10;
s7, setting the virtual gear ratio Nvir = Nlow, and then executing S8;
s8, judging whether the timing time reaches a time threshold B, if so, executing S9, otherwise, returning to execute S6;
s9, gradually changing the value of the virtual transmission ratio Nvir from a transmission ratio lower limit Nlow to an actual torque transmission ratio N, and then ending;
s10, the virtual gear ratio Nvir = Nactg, the lower limit gear ratio Nlow =0, and then the process ends.
Preferably, if the accelerator opening is greater than a preset accelerator opening threshold value W and is in the gear shifting process, and the target gear is greater than the current gear, it indicates that the vehicle state is in the accelerator stepping and gear shifting process.
Preferably, a preset transmission ratio table is inquired according to the current gear, and the transmission ratio Nactg of the current gear transmission when the transmission is locked can be obtained; the preset transmission ratio table is a corresponding relation table of the current gear and the transmission ratio when the transmission is locked, which is obtained in a calibration mode.
Preferably, a preset multiple table is inquired according to the current gear and the accelerator opening, and a virtual transmission ratio multiple A can be obtained; the preset multiple table is a corresponding relation table of the current gear, the accelerator opening and the virtual transmission ratio multiple obtained in a calibration mode.
Preferably, a preset time threshold value table is inquired according to the current gear and the accelerator opening degree, and a time threshold value B can be obtained; the preset time threshold value table is a corresponding relation table of the current gear, the accelerator opening and the time threshold value obtained in a calibration mode.
Preferably, in step S9, the value of the virtual gear ratio Nvir is gradually changed from the gear ratio lower limit Nlow to the actual torque gear ratio N by a low-pass filter; the control time C of the low-pass filter is obtained by inquiring a preset control time table according to the current gear and the accelerator opening, and the preset control time table is a corresponding relation table of the current gear, the accelerator opening and the control time obtained in a calibration mode.
Preferably, the step of determining the virtual gear ratio Nvir based on the vehicle state and the actual torque gear ratio N may be performed by a transmission controller or may be performed by an engine controller.
The virtual transmission ratio is introduced in the accelerator stepping and gear-up process, and the actual torque transmission ratio is not used as a calculation factor of the engine end required torque, so that the calculated engine end required torque is more reasonable, the condition that the engine torque is increased excessively in the accelerator stepping and gear-up process is avoided, the gear-shifting quality is improved, and the oil consumption is reduced.
Drawings
Fig. 1 is a flowchart of a method for determining a required torque on the engine side of a vehicle according to embodiment 1.
Fig. 2 is a flowchart of determining the virtual gear ratio Nvir according to the vehicle state and the actual torque gear ratio N in embodiment 1.
Fig. 3 is a flowchart of a method for determining a required torque at the engine end of the vehicle according to embodiment 2.
Detailed Description
Example 1: as shown in fig. 1 and fig. 2, the method for determining the torque required at the engine end of the vehicle in the embodiment is cooperatively executed by a transmission controller and an engine controller, and specifically includes:
step one, the transmission controller determines the actual torque transmission ratio N (which is determined in a manner known in the art).
And step two, the transmission controller sends the actual torque transmission ratio N to the engine controller.
And step three, the engine controller determines a virtual transmission ratio Nvir according to the vehicle state and the actual torque transmission ratio N.
Specific ways of determining the virtual gear ratio Nvir include:
s1, judging whether the vehicle state is in the process of stepping on the accelerator and upshifting, if so, executing S2, otherwise, executing S10.
If the accelerator opening is larger than a preset accelerator opening threshold value W, the vehicle is in a gear shifting process, and the target gear is larger than the current gear, the vehicle is in the accelerator stepping and gear shifting process, otherwise, the vehicle is not in the accelerator stepping and gear shifting process. When the vehicle state is in the process of stepping on the accelerator for upshifting, the stepping on accelerator for upshifting mark position B _ power up = TURE, and when the vehicle state is not in the process of stepping on the accelerator for upshifting, the stepping on accelerator for upshifting mark position B _ power up = FALSE.
S2, let the gear ratio lower limit Nlow = Nactg × a, and then S3 is executed.
And S3, judging whether the actual torque transmission ratio N is greater than or equal to the transmission ratio lower limit Nlow, if so, executing S4, otherwise, executing S5.
S4, the virtual gear ratio Nvir = N, and then ends.
And S5, starting the timer, and then executing S6.
And S6, judging whether the vehicle state is in the process of stepping on the accelerator and upshifting, if so, executing S7, otherwise, executing S10.
S7, let virtual gear ratio Nvir = Nlow, and then S8 is executed.
And S8, judging whether the timing time reaches a time threshold B, if so, executing S9, otherwise, returning to execute S6.
And S9, gradually changing the value of the virtual transmission ratio Nvir from the transmission ratio lower limit Nlow to the actual torque transmission ratio N through a low-pass filter, and then ending.
S10, the virtual gear ratio Nvir = Nactg, the lower limit gear ratio Nlow =0, and then the process ends.
Where Nactg represents the gear ratio when the current gear transmission is locked, and A represents the virtual gear ratio multiple. And inquiring a preset transmission ratio table according to the current gear to obtain the transmission ratio Nactg when the transmission of the current gear is locked, wherein the preset transmission ratio table is a corresponding relation table of the current gear and the transmission ratio when the transmission is locked, and the corresponding relation table is obtained in a calibration mode. And inquiring a preset multiple table according to the current gear and the accelerator opening to obtain a virtual transmission ratio multiple A, wherein the preset multiple table is a corresponding relation table of the current gear, the accelerator opening and the virtual transmission ratio multiple obtained in a calibration mode. And inquiring a preset time threshold value table according to the current gear and the accelerator opening to obtain a time threshold value B, wherein the preset time threshold value table is a corresponding relation table of the current gear, the accelerator opening and the time threshold value obtained by a calibration mode. The control time C of the low-pass filter is obtained by inquiring a preset control time table according to the current gear and the accelerator opening, and the preset control time table is a corresponding relation table of the current gear, the accelerator opening and the control time obtained in a calibration mode.
Step four, the engine controller determines the wheel end torque T CW (the way of determination is in the prior art) and using the formula: t is ENG =T CW Nvir, calculating the engine end required torque T ENG 。
Example 2: as shown in fig. 3, the method for determining the torque required at the engine end of the vehicle in the present embodiment is executed by the transmission controller and the engine controller, and specifically includes:
step one, the transmission controller determines the actual torque transmission ratio N (which is determined in a manner known in the art).
And step two, the transmission controller determines a virtual transmission ratio Nvir according to the vehicle state and the actual torque transmission ratio N. The specific manner of determining the virtual gear ratio Nvir is the same as in embodiment 1, and includes steps S1 to S10 as well, except that steps S1 to S10 are implemented by programming from the transmission controller.
And step three, the transmission controller sends the virtual transmission ratio Nvir to the engine controller.
Step four, the engine controller determines the wheel end torque T CW (the way of determination is in the prior art) and using the formula: t is ENG =T CW Nvir, calculating the engine end required torque T ENG 。
Claims (5)
1. A method of determining a torque demand on an engine side of a vehicle, comprising:
determining an actual torque transmission ratio N;
determining a virtual transmission ratio Nvir according to the vehicle state and the actual torque transmission ratio N;
determining wheel end torque T CW And using the formula: t is ENG =T CW Nvir, calculating the engine end required torque T ENG ；
Wherein the step of determining the virtual gear ratio Nvir from the vehicle state and the actual torque gear ratio N comprises:
s1, judging whether the vehicle state is in the process of stepping on the accelerator and upshifting, if so, executing S2, otherwise, executing S10;
s2, enabling the lower limit Nlow of the transmission ratio to = Nactg multiplied by A, and then executing S3; wherein Nactg represents the transmission ratio when the current gear transmission is locked, and A represents a virtual transmission ratio multiple;
s3, judging whether the actual torque transmission ratio N is larger than or equal to a transmission ratio lower limit Nlow, if so, executing S4, otherwise, executing S5;
s4, enabling the virtual transmission ratio Nvir = N, and then ending;
s5, starting timing by a timer, and then executing S6;
s6, judging whether the vehicle state is in the process of stepping on the accelerator and upshifting, if so, executing S7, otherwise, executing S10;
s7, making the virtual gear ratio Nvir = Nlow, and then executing S8;
s8, judging whether the timing time reaches a time threshold B, if so, executing S9, otherwise, returning to execute S6;
s9, gradually changing the value of the virtual transmission ratio Nvir from a transmission ratio lower limit Nlow to an actual torque transmission ratio N, and then ending;
s10, the virtual gear ratio Nvir = Nactg, and the gear ratio lower limit Nlow =0, and then ends;
if the accelerator opening is larger than a preset accelerator opening threshold value W and is in the gear shifting process, and the target gear is larger than the current gear, the vehicle state is in the accelerator stepping and gear shifting process.
2. The method of determining a torque demand on the engine side of a vehicle as claimed in claim 1, wherein:
inquiring a preset transmission ratio table according to the current gear to obtain the transmission ratio Nactg when the transmission of the current gear is locked; the preset transmission ratio table is a corresponding relation table of the current gear and the transmission ratio when the transmission is locked, which is obtained in a calibration mode;
inquiring a preset multiple table according to the current gear and the accelerator opening to obtain a virtual transmission ratio multiple A; the preset multiple table is a corresponding relation table of the current gear, the accelerator opening and the virtual transmission ratio multiple obtained in a calibration mode;
inquiring a preset time threshold table according to the current gear and the accelerator opening to obtain a time threshold B; the preset time threshold value table is a corresponding relation table of the current gear, the accelerator opening and the time threshold value obtained in a calibration mode.
3. The method of determining a torque demand on the engine side of a vehicle according to claim 1 or 2, characterized in that: in step S9, gradually changing the value of the virtual gear ratio Nvir from the gear ratio lower limit Nlow to the actual torque gear ratio N by a low-pass filter; the control time C of the low-pass filter is obtained by inquiring a preset control time table according to the current gear and the accelerator opening, and the preset control time table is a corresponding relation table of the current gear, the accelerator opening and the control time obtained in a calibration mode.
4. The method of determining a required torque on the engine side of a vehicle according to claim 3, characterized in that: the step of determining a virtual gear ratio Nvir based on the vehicle state and the actual torque transmission ratio N is performed by a transmission controller.
5. The method of determining a torque demand on the engine side of a vehicle as set forth in claim 3, wherein: the step of determining a virtual gear ratio Nvir based on vehicle conditions and the actual torque ratio N is performed by an engine controller.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111270974.8A CN113983155B (en) | 2021-10-29 | 2021-10-29 | Method for determining required torque at engine end of vehicle |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202111270974.8A CN113983155B (en) | 2021-10-29 | 2021-10-29 | Method for determining required torque at engine end of vehicle |
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| CN113983155A CN113983155A (en) | 2022-01-28 |
| CN113983155B true CN113983155B (en) | 2023-03-24 |
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| CN114738479B (en) * | 2022-04-26 | 2023-12-22 | 中国北方车辆研究所 | Safety control method for transmission device with ultra-wide transmission ratio range |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| DE19652457C2 (en) * | 1996-12-17 | 2003-05-15 | Zahnradfabrik Friedrichshafen | Safety system for an automatic transmission |
| JP4251182B2 (en) * | 2006-01-13 | 2009-04-08 | トヨタ自動車株式会社 | Vehicle control device |
| JP4488058B2 (en) * | 2007-11-09 | 2010-06-23 | トヨタ自動車株式会社 | Vehicle driving force control device |
| DE102009035779A1 (en) * | 2009-08-01 | 2011-02-03 | Daimler Ag | Method for operating transmission i.e. power-split hybrid-transmission, for hybrid vehicle, involves selecting gear of transmission based on modified reference speed value and determined tolerance range |
| US8795131B2 (en) * | 2012-11-28 | 2014-08-05 | Ford Global Technologies, Llc | Method and apparatus for reducing torque during a transmission upshift for a hybrid vehicle |
| US9862384B2 (en) * | 2016-02-08 | 2018-01-09 | Ford Global Technologies, Llc | Method of shifting a transmission |
| CN108533739B (en) * | 2018-03-27 | 2020-06-23 | 吉利汽车研究院（宁波）有限公司 | Gear shifting method and device for automatic transmission vehicle |
| CN112855920B (en) * | 2019-11-27 | 2022-04-26 | 广州汽车集团股份有限公司 | Calculation method and gear shifting method for continuous speed ratio of double-clutch transmission |
| CN111942385B (en) * | 2020-07-28 | 2021-12-03 | 广州汽车集团股份有限公司 | Control method and system for automatic lane change of vehicle, control device and medium |
| CN112283339B (en) * | 2020-11-16 | 2022-04-05 | 潍柴动力股份有限公司 | Gear processing method, gear processing device, gear processing equipment and computer readable storage medium |
| CN113291163B (en) * | 2021-06-28 | 2023-03-14 | 重庆长安汽车股份有限公司 | Torque control method and system of automatic transmission automobile and automobile |
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