CN107218385B - Slide the power downshift control method in downshift - Google Patents
Slide the power downshift control method in downshift Download PDFInfo
- Publication number
- CN107218385B CN107218385B CN201710600479.6A CN201710600479A CN107218385B CN 107218385 B CN107218385 B CN 107218385B CN 201710600479 A CN201710600479 A CN 201710600479A CN 107218385 B CN107218385 B CN 107218385B
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- downshift
- speed
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- torque
- power
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Classifications
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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
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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
- F16H59/141—Inputs being a function of torque or torque demand of rate of change of torque or torque demand
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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
-
- 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
- F16H59/46—Inputs being a function of speed dependent on a comparison between speeds
-
- 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
Abstract
The invention discloses a kind of power downshift control methods slided in downshift.The power downshift control method slided in downshift of the invention, during sliding downshift, if driver steps on the gas, the gearshift condition of comprehensive descision vehicle adjusts clutch control strategy in shift process in real time.The present invention efficiently solves slide downshift during driver step on the gas under operating condition, shift shock problem caused by engine speed overshoot, can guarantee engine governed speed stablize, shift process is smooth, promoted vehicle driving impression.
Description
Technical field
The present invention relates to double-clutch automatic gearbox control technology field is belonged to, it is automatic to be related to a kind of wet-type dual-clutch
Speed changer slides the power downshift control method in downshift.
Background technique
Comfort and economy are two important indicators of development of automobile, speed changer as powerdriven significant element,
Play very important role.DCT (Dual Clutch Transmission) double-clutch automatic gearbox, be it is current from
One new direction of dynamic speed changer development.It is compared with AMT speed changer, DCT shift of transmission does not have power interruption, comfort property
Enough and AT speed changer matches in excellence or beauty.Since AT speed changer has fluid torque-converter, transmission efficiency is not high, and DCT speed changer is relative to tradition
AT speed changer, also have the advantages that fuel-efficient, DCT speed changer set AMT speed changer transmission efficiency height and AT speed changer are comfortable
The good feature of property, the quality of clutch control determine the comfort of shift of transmission.
The control of clutch can be divided into shift stage control and non-shift stage control, and control system is believed based on sensor
Number input, for example speed, accelerator open degree etc. obtains target gear by judgement, if target gear is consistent with current shift,
Then the clutch of current shift combines constant；If target gear and current shift are inconsistent, shift control model can be entered.
Based on different shifting type and dynamic mode, shift process is different, and shift process all includes clutch moment of torque switching phase
With the engine governed speed stage.
When driver unclamps gas pedal, brake pedal, DCT speed changer will will do it and slide downshift, slide downshift
Shift process in, first carry out clutch moment of torque exchange, then carry out engine governed speed.When driver steps on the gas (work of such as overtaking other vehicles suddenly
Condition), DCT speed changer will will do it power downshift, in the shift process of power downshift, first carry out engine governed speed, then carry out from
The exchange of clutch torque.
During vehicle sliding downshift, when driver intention changes, when stepping on the throttle, continue according to sliding downshift
Strategy is controlled, and is likely occurred speed overshoot in the engine governed speed stage, can be caused biggish impact, needs to be switched at this time
Power downshift control model makes engine smoothly adjustable-speed, realizes smooth shift.
Summary of the invention
During sliding downshift for wet-type double-clutch automatic speed-change device, engine speed overshoot after driver steps on the gas
Problem, the present invention provide a kind of power downshift control method slided in downshift, real-time judge engine speed and target gear
The difference of clutch rotational speed, according to the difference in shift process clutch moment of torque switching phase and the engine governed speed stage into
Row adjustment, guarantees vehicle smooth gear shifting.
The present invention solves technical problem and adopts the following technical scheme that a kind of power downshift control method slided in downshift,
Comprising:
S10, during sliding downshift, real-time judge accelerator open degree and engine torque, if accelerator open degree be greater than throttle
Aperture calibration value, while engine torque is greater than engine torque calibration value, then executes S20；
S20, judge whether current shift process enters the engine governed speed stage, if so, shifting type is switched to dynamic
Power downshift, and execute S30；If it is not, shifting type is switched to power after then waiting shift process to enter the engine governed speed stage
Downshift, and execute S30；
S30, the percentage for calculating target gear clutch rotational speed and engine speed difference；
S40, when the percentage calculated in S30 is less than or equal to percentage calibration value, control currently controlled shaft clutch and turn round
Square carries out engine governed speed, and until engine speed is synchronous with target gear clutch rotational speed, downshift is completed；When being calculated in S30
Percentage be greater than percentage calibration value when, then execute S50；
S50, into adjust the speed and adjust the torsion stage, carry out torque exchange, switching controlled shaft be current shift where axis；
Shaft clutch where S60, current shift is re-engaged, and speed regulation and torsion pass is carried out by the clutch, until starting
Machine revolving speed is synchronous with target gear clutch rotational speed；
S70, torque exchange is carried out, switching controlled shaft is axis where target gear；After the completion of torque exchange, downshift is completed.
Optionally, accelerator open degree calibration value is 5%.
Optionally, engine torque calibration value is 80Nm.
Optionally, the percentage calibration value is 20%.
The invention has the following beneficial effects: the power downshift control methods slided in downshift of the invention, are sliding drop
During gear, if driver steps on the gas, the gearshift condition of comprehensive descision vehicle adjusts clutch control plan in shift process in real time
Slightly.The present invention efficiently solves slide downshift during driver step on the gas under operating condition, shift caused by engine speed overshoot
Shock problem can guarantee that engine governed speed is stablized, and shift process is smooth, promote the driving impression of vehicle.
Detailed description of the invention
Fig. 1 is the flow chart for sliding the power downshift control method in downshift；
Fig. 2 is to slide the power downshift control process in downshift for stepping on the gas when sliding downshift speed regulation and starting；
Specific embodiment
Technical solution of the present invention is further elaborated below with reference to examples and drawings.
Embodiment 1
A kind of power downshift control method slided in downshift is present embodiments provided, during sliding downshift, if driving
The person of sailing steps on the gas, and waits shift process to enter the engine governed speed stage, will slide downshift and be switched to power downshift, sentence in real time at this time
Disconnected engine speed and target clutch rotational speed are poor, if difference is smaller, are directly adjusted the speed, downshift is rapidly completed, will not generated
Engine speed overshoot；If difference is larger, first carry out torque exchange, using shaft clutch where current shift carry out speed regulation and
Torsion pass can avoid engine speed overshoot after stepping on the gas, and carry out torque exchange again after the completion of speed regulation, complete downshift.
The described method includes:
S10, during sliding downshift, if accelerator open degree be greater than accelerator open degree calibration value, while engine torque be greater than hair
Motivation torque calibration value, and process of shifting gears has entered the engine governed speed stage, then shifting type is switched to power downshift；
In the present embodiment, with reference to Fig. 2, wherein t0 to the t1 moment is clutch moment of torque switching phase, and t1 to the t2 moment is hair
Motivation adjusts the speed the stage, and t2 to the t3 moment is to adjust the speed and adjust the torsion stage, and t3 to the t4 moment is engine governed speed stage, t4 to t5 moment
For clutch moment of torque switching phase.
During sliding downshift, real-time judge accelerator open degree and engine torque, if accelerator open degree is greater than accelerator open degree
Calibration value, while engine torque is greater than engine torque calibration value, then executes S20.This Rule of judgment is to guarantee vehicle
State has been switched to engine driving.Preferably, accelerator open degree calibration value is 5% in the present embodiment, engine torque calibration value
The arbitrary value that torque calibration value for 80Nm or engine is 80-100Nm.
S20, judge whether current shift process enters the engine governed speed stage, if so, shifting type is switched to dynamic
Power downshift, and execute S30；If it is not, shifting type is switched to power after then waiting shift process to enter the engine governed speed stage
Downshift, and execute S30.As shown in Fig. 2, that is, t2 moment, driver step on the throttle when sliding downshift speed regulation beginning, class of shifting gears
Type is switched to power downshift.
S30, first calculate target gear clutch rotational speed and engine speed difference percentage, it may be assumed that (target gear from
Clutch speed-engine revolving speed)/(target gear clutch rotational speed-current shift clutch rotational speed).Then by the percentage with
Percentage calibration value is compared, which is obtained based on complete vehicle test, it is preferable that the percentage in the present embodiment
Calibration value is 20%.
S40, when the percentage calculated in S30 is less than or equal to percentage calibration value (20%), i.e., engine speed has been
Close to target gear clutch rotational speed, then current controlled shaft clutch moment of torque is controlled, carry out engine governed speed, until engine turns
Speed is synchronous with target gear clutch rotational speed, and downshift is completed；When the percentage calculated in S30 is greater than percentage calibration value (20%)
When, i.e. engine speed and target gear clutch rotational speed difference is larger, then executes S50.
S50, shift process enter SpeedandTorque (the speed regulation and tune are turned round) stage, carry out torque exchange, switching is controlled
Axis is axis where current shift；The torque swap time in stage be it is independent, can individually demarcate, with guarantee torque exchange it is fast
Speed.
In the present embodiment, because driver steps on the gas, engine is in dynamic regime, and current controlled shaft is targeted gear at this time
Axis where position, is adjusted the speed using the shaft clutch, can be aggravated the rate of engine speed rising, be made engine speed overshoot
Greatly, it is unfavorable for control of engine speed.Therefore need to carry out torque exchange, switching controlled shaft is axis where current shift, is utilized
The shaft clutch is adjusted the speed, and the rate of engine speed rising can be preferably controlled.
As shown in Fig. 2, t2 moment engine speed differs larger with target clutch rotational speed, adjusted at t2 to the t3 moment
Speed and tune are turned round, and clutch moment of torque exchange is rapidly completed.
Shaft clutch where S60, current shift is re-engaged, and speed regulation and torsion pass is carried out by the clutch, until starting
Machine revolving speed is synchronous with target gear clutch rotational speed.
As shown in Fig. 2, t3 to the t4 moment is the engine governed speed stage, adjusted the speed by shaft clutch where current shift
And torsion pass, engine speed are finally synchronous with target gear clutch rotational speed.
S70, carry out torque exchange, switching controlled shaft is axis where target gear, as in Fig. 2 the t4 moment to t5 moment curve
It is shown.After the completion of torque exchange, downshift is completed.
The power downshift control method slided in downshift of the present embodiment, during sliding downshift, if driver steps on oil
Door, the gearshift condition of comprehensive descision vehicle adjust clutch control strategy in shift process in real time.The present invention efficiently solves cunning
Driver steps on the gas under operating condition in row downshift, and shift shock problem caused by engine speed overshoot can guarantee engine tune
Speed is stablized, and shift process is smooth, promotes the driving impression of vehicle.
In the present embodiment, the engine governed speed stage during the downshift is to have engaged clutch moment of torque by adjusting, controls
Engine speed ascending curve processed, it is finally consistent with target gear clutch rotational speed.
The sequencing of above embodiments is not only for ease of description, represent the advantages or disadvantages of the embodiments.
Finally, it should be noted that the above embodiments are merely illustrative of the technical solutions of the present invention, rather than its limitations；Although
Present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that: it still may be used
To modify the technical solutions described in the foregoing embodiments or equivalent replacement of some of the technical features；
And these are modified or replaceed, technical solution of various embodiments of the present invention that it does not separate the essence of the corresponding technical solution spirit and
Range.
Claims (4)
1. a kind of power downshift control method slided in downshift characterized by comprising
S10, during sliding downshift, real-time judge accelerator open degree and engine torque, if accelerator open degree be greater than accelerator open degree
Calibration value, while engine torque is greater than engine torque calibration value, then executes S20；
S20, judge whether current shift process enters the engine governed speed stage, if so, shifting type is switched to power drop
Gear, and execute S30；If it is not, shifting type is switched to power drop after then waiting shift process to enter the engine governed speed stage
Gear, and execute S30；
S30, the percentage for calculating target gear clutch rotational speed and engine speed difference；
S40, when the percentage calculated in S30 be less than or equal to percentage calibration value when, control current controlled shaft clutch moment of torque,
Engine governed speed is carried out, until engine speed is synchronous with target gear clutch rotational speed, downshift is completed；When what is calculated in S30
When percentage is greater than percentage calibration value, then S50 is executed；
S50, into adjust the speed and adjust the torsion stage, carry out torque exchange, switching controlled shaft be current shift where axis；
Shaft clutch where S60, current shift is re-engaged, and carries out speed regulation and torsion pass by the clutch, until engine turns
Speed is synchronous with target gear clutch rotational speed；
S70, torque exchange is carried out, switching controlled shaft is axis where target gear；After the completion of torque exchange, downshift is completed.
2. the power downshift control method according to claim 1 slided in downshift, which is characterized in that accelerator open degree calibration
Value is 5%.
3. the power downshift control method according to claim 2 slided in downshift, which is characterized in that engine torque mark
Definite value is 80Nm.
4. the power downshift control method according to claim 3 slided in downshift, which is characterized in that the percentage mark
Definite value is 20%.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710600479.6A CN107218385B (en) | 2017-07-21 | 2017-07-21 | Slide the power downshift control method in downshift |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710600479.6A CN107218385B (en) | 2017-07-21 | 2017-07-21 | Slide the power downshift control method in downshift |
Publications (2)
| Publication Number | Publication Date |
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| CN107218385A CN107218385A (en) | 2017-09-29 |
| CN107218385B true CN107218385B (en) | 2019-02-26 |
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| CN201710600479.6A Active CN107218385B (en) | 2017-07-21 | 2017-07-21 | Slide the power downshift control method in downshift |
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| CN108944933B (en) * | 2018-06-12 | 2020-09-11 | 吉利汽车研究院（宁波）有限公司 | Intelligent idling control system and method for engine |
| CN110816536B (en) * | 2018-08-08 | 2021-07-20 | 宝沃汽车（中国）有限公司 | Vehicle control method and device and vehicle |
| CN110077408B (en) * | 2019-03-25 | 2020-11-06 | 中山职业技术学院 | Intelligent downshift control method for automatic-gear vehicle |
| CN110304034B (en) * | 2019-06-24 | 2020-12-18 | 中国第一汽车股份有限公司 | Start-up and shift coordination control method for P2 configuration hybrid vehicle starter |
| CN111071242B (en) * | 2019-12-29 | 2021-08-31 | 吉泰车辆技术（苏州）有限公司 | Seamless downshift control method for hybrid system |
| CN111810627B (en) * | 2020-07-08 | 2021-08-27 | 中国第一汽车股份有限公司 | Double-clutch sliding downshift control method |
| CN112392948B (en) * | 2020-12-08 | 2022-02-01 | 安徽江淮汽车集团股份有限公司 | Vehicle power upshift method, TCU and vehicle |
| CN112963527B (en) * | 2021-02-26 | 2022-06-21 | 蜂巢传动科技河北有限公司 | Vehicle control method, device, storage medium, electronic device and vehicle |
| CN115217950B (en) * | 2021-04-25 | 2023-11-17 | 广州汽车集团股份有限公司 | Coasting downshift control method, vehicle-mounted controller and automobile |
| CN113062977B (en) * | 2021-04-28 | 2022-07-22 | 蜂巢传动科技河北有限公司 | Clutch control method and device during engine load change and vehicle |
| CN113074247B (en) * | 2021-05-08 | 2022-03-04 | 北京航空航天大学 | Gear shifting control method for changing intention in power gear shifting process |
| CN113847421B (en) * | 2021-09-30 | 2022-11-18 | 蜂巢传动系统(江苏)有限公司保定研发分公司 | Vehicle transmission control method, unit and control system and vehicle |
| CN113978442B (en) * | 2021-10-30 | 2024-03-19 | 蜂巢传动科技河北有限公司 | Vehicle control method and unit, vehicle control system and vehicle |
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| US6656087B1 (en) * | 2002-06-11 | 2003-12-02 | General Motors Corporation | Multi-stage skip downshift control for an automatic transmission |
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| CN103765052A (en) * | 2011-09-07 | 2014-04-30 | 日产自动车株式会社 | Coasting downshift control device for automatic transmission |
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| CN107218385A (en) | 2017-09-29 |
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