CN105179676A - Braking downshifting control method for automatic six-speed wet type double-clutch transmission - Google Patents
Braking downshifting control method for automatic six-speed wet type double-clutch transmission Download PDFInfo
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- CN105179676A CN105179676A CN201510489663.9A CN201510489663A CN105179676A CN 105179676 A CN105179676 A CN 105179676A CN 201510489663 A CN201510489663 A CN 201510489663A CN 105179676 A CN105179676 A CN 105179676A
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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
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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
- F16H59/18—Inputs being a function of torque or torque demand dependent on the position of the accelerator pedal
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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
- F16H59/38—Inputs being a function of speed of gearing elements
- F16H59/42—Input shaft speed
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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
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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
- F16H59/50—Inputs being a function of the status of the machine, e.g. position of doors or safety belts
- F16H59/56—Inputs being a function of the status of the machine, e.g. position of doors or safety belts dependent on signals from the main clutch
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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
- F16H59/68—Inputs being a function of gearing status
- F16H59/70—Inputs being a function of gearing status dependent on the ratio established
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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
- F16H61/06—Smoothing ratio shift by controlling rate of change of fluid pressure
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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
- F16H2061/0075—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 a particular control method
- F16H2061/0096—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 a particular control method using a parameter map
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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
- F16H2061/0459—Smoothing ratio shift using map for shift parameters, e.g. shift time, slip or pressure gradient, for performing controlled shift transition and adapting shift parameters by learning
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- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- Control Of Transmission Device (AREA)
Abstract
The invention discloses a braking downshifting control method for an automatic six-speed wet type double-clutch transmission. The braking downshifting control method for the automatic six-speed wet type double-clutch transmission comprises the steps that a driving intention is judged rapidly by monitoring the traveling state in real time, and the target accelerated speed is worked out; and then the target gear is updated in real time by checking a gear graph, whether the downshifting type refers to that an odd number of gears need to be reduced or that an even number of gears need to be reduced is determined according to the target gear, so that corresponding single-gear downshifting or multi-gear downshifting is controlled. According to the braking downshifting control method for the automatic six-speed wet type double-clutch transmission, in order to guarantee smooth downshifting of a vehicle, multi-gear downshifting in a repeated-braking downshifting strategy is developed based on the structural characteristics of a wet clutch and is verified in real vehicles.
Description
Technical field
What the present invention relates to is a kind of technology of automotive automation control field, specifically a kind of downshift controlling method that touches on the brake of six fast wet type double-clutch automatic gearboxes.
Background technique
DCT (DualClutchTransmission, double-clutch speed changer) be replace hand-gear shift lever by TCU and valve body on MT basis, and in order to ensure that power does not interrupt a kind of automatic transmission selecting two clutches to control transmission of power.Tacit agreement between two clutches coordinates, and the raising of automobile ride and power character, needs high-precision control strategy.How in vehicle travel process, we often run into a lot of emergency situations, need to take emergency braking to avoid danger, emphasis vehicle being stopped be research of quick and stable.The weight that braking pedal steps down, the selection for downshift type is a difficult point, and downshift type selecting is improper, can affect the life-span of driving sense and shortening two clutch.
When vehicle, driver in smooth ride process heavily touches on the brake with faster rate, double-clutch automatic gearbox can carry out downshifting to obtain larger power, when heavily touching on the brake, the speed of a motor vehicle declines rapidly, if at this moment employing order single grade of downshift, clutch is frequently mutual, easily causes clutch overheat, and downshift overlong time, driver can feel there is pause and transition in rhythm or melody sense.
When driver heavily touches on the brake, TCU decides the downshift point of each downshift according to the acceleration magnitude of vehicle.When acceleration ratio is larger, relatively, target gear change is fast, and synchronizer has little time action, and then occurs the situation of falling many grades for the shifting points between adjacent gear positions.
Through finding the retrieval of prior art, Chinese patent literature CN103758995A, publication date 2014.04.30, disclose a kind of dual-clutch transmission brake downshift controlling method, comprising: obtain brake pedal pressure, gas pedal aperture, the speed of a motor vehicle, car load acceleration and current gear; Obtain according to brake pedal pressure the percentaeg that brakes, tabling look-up according to brake percentaeg obtains gain coefficient; According to the speed of a motor vehicle and gain coefficient, obtain the actual speed of a motor vehicle of putting into gear; According to the actual speed of a motor vehicle and the gas pedal aperture of putting into gear, table look-up and obtain first object gear; Judge whether first object gear is less than current gear, and whether gas pedal aperture equals 0; If so, then according to brake percentaeg and car load acceleration, determine enter common brake downshift control mode or enter the downshift control mode that heavily touches on the brake; If enter common brake downshift control mode, then perform common brake downshift and control; If enter the downshift control mode that heavily touches on the brake, then perform the downshift that heavily touches on the brake and control.But this technology does not have many grades of downshift Clutch Control strategies, easily causes clutch sliding wear and clutch overheat in downshift process.
Summary of the invention
How in vehicle travel process, we often run into a lot of emergency situations, need to take emergency braking to avoid danger, emphasis vehicle being stopped be research of quick and stable.The weight that braking pedal steps down, selection for downshift type is a difficult point, downshift type selecting is improper, the life-span of driving sense and shortening two clutch can be affected, the present invention is directed to prior art above shortcomings, a kind of downshift controlling method that touches on the brake of six fast wet type double-clutch automatic gearboxes is proposed, when vehicle is in normal running process, because certain danger situation driver steps on brake petal with the power comparatively fast strengthened, double-clutch speed changer is caused automatically to downshift, steadily to reduce the effect that the speed of a motor vehicle reaches fast braking rapidly.
The present invention is achieved by the following technical solutions:
The present invention is by monitoring driving states in real time to judge driving intention fast and to calculate aimed acceleration, then by looking into gearshift figure real-time update target gear, and determine that downshift type is for falling odd number gear or falling even number gear according to target gear, to carry out single grade of corresponding downshift or many grades of downshift controls.
Described driving states comprises: the state of the speed of a motor vehicle, two input shaft rotating speeds, target gear, synchronizer action flag bit, two clutch, Engine torque and gas pedal and braking pedal angle.
Described driving intention comprises: when the speed of a motor vehicle is greater than 50km/h, and when target gear and actual-gear are all 5, vehicle is in stable state and drives, now:
A) step on brake petal with the power being less than 20Bar, target gear change is comparatively slow, and gearbox has time enough to complete gearshift, at this moment adopts single grade of down-shift strategy, can not cause clutch overheat, can ensure smooth gear shifting;
B) step on brake petal with the power being greater than 20Bar, target gear transformation period is too short, and gearbox has little time to carry out single grade of downshift, and at this moment adopt many grades of downshifts, guarantee can not cause clutch overheat, and smooth gear shifting.
The described gearshift figure that looks into refers to: the shifting points of each gear tabled look-up according to the speed of a motor vehicle negativeacceleration obtained of differentiating, obtained result of tabling look-up adds the compensation based on atmospheric pressure, to be applicable to the different road conditions such as plateau or level land.
Described recasting is moved downshift and is comprised: fall odd number gear and fall even number gear, and downshift gear span is larger, then motor needs the rotating speed of target span that reaches also larger.
The described odd number gear that falls refers to: former gear and target gear are at different input shaft upper driving, and such as 5 ?2, can directly downshift, and the concrete control stage is as follows:
1) heavy brake target gear determines the stage: jointly being tabled look-up by acceleration and atmospheric pressure obtains downshift point v_down, determines target gear by v_down.
2) the motor raising speed stage: offgoing clutch (clutch to be separated) moment of torsion declines, clutch is opened, controlling engine speed and carry out raising speed according to targeted rate, judging that downshift type is as falling odd number shelves according to target gear and actual-gear simultaneously.
3) engine speed synchronous phase: offgoing clutch moment of torque rises, controls motor raising speed and slows down, and prepares synchronous; When engine speed is greater than rotating speed of target, control engine peed stable at the above 50rpm of rotating speed of target; Oncoming clutch (clutch to be combined) carries out preliminary filling oil pressure.
4) moment of torsion switching phase: when engine speed and oncoming clutch rotational speed difference are less than 50rpm, and oncoming clutch preliminary filling oil pressure completes, then start moment of torsion and exchange, make oncoming clutch transmission torque, shift process terminates.
The described even number gear that falls refers to: former gear and target gear are by the driven off by shaft downshift of same input, and such as 4 fall 2; For ensureing that the intervening gears on another input shaft of smooth gear shifting sexual needs carries out transition, such as 4 fall the 3 grades of transition of 2 needs, and therefore fall the transient process that even number gear and the difference of falling odd number gear are just intervening gears, the concrete control stage is as follows:
I) heavy brake target gear determines the stage: jointly being tabled look-up by acceleration and atmospheric pressure obtains downshift point v_down, determines target gear by v_down.
Ii) the motor raising speed stage (former gear speed governing stage): the clutch moment of torque of work at present declines, clutch is opened, controlling engine speed and carry out raising speed according to targeted rate, judging that downshift type is as falling even number gear according to target gear and actual-gear;
Iii) in the intervening gears speed governing stage: when intervening gears pre-oiling presses and engine speed is raised to more than intervening gears, former gear clutch moment of torsion slowly declines, and the clutch adapter that intervening gears is corresponding controls speed governing;
Iv) engine speed synchronous phase: offgoing clutch moment of torque rises, controls motor raising speed and slows down, and prepares synchronous; When engine speed is greater than rotating speed of target, control engine peed stable at the above 50rpm of rotating speed of target;
V) moment of torsion switching phase: when engine speed and oncoming clutch rotational speed difference are less than 50rpm, and oncoming clutch preliminary filling oil pressure completes, then start moment of torsion and exchange, make oncoming clutch transmission torque, shift process terminates.
Technique effect
Compared with prior art, the shifting points that the present invention is determined by continuous real train test, the actual intention meeting driver is compared in determination for target gear, engine speed control strategy makes motor fast and stable in boosting velocity procedure, the control of clutch moment of torque makes clutch moment of torque exchange process smooth-going, simultaneously clutch temp rises slowly, has illustrated effective and has prevented clutch overheat, in a word high quality, complete whole heavy brake downshift fast, stably.
Accompanying drawing explanation
Fig. 1 is heavy brake process downshift control flow chart;
Fig. 2 is heavy brake when falling odd number gear, variation tendency schematic diagram between the variation tendency schematic diagram between axle rotating speed to be separated, axle rotating speed to be combined, engine speed and axle axle moment of torsion to be separated, axle axle moment of torsion to be combined, Engine torque;
In figure: (1) (2) are for engine speed is according to the targeted rate raising speed stage, and (3), for preparing synchronous phase, (4), for stablize the engine speed stage, (5) are clutch moment of torque switching phase.
Fig. 3 is heavy brake when falling even number gear, variation tendency schematic diagram between the variation tendency schematic diagram between axle rotating speed to be separated, axle rotating speed to be combined, engine speed and axle moment of torsion to be separated, axle moment of torsion to be combined, Engine torque;
In figure: (1) is the former gear speed governing stage, (2) be the intervening gears speed governing stage, (3) for preparing synchronous phase, (4), for stablize the engine speed stage, (5) are clutch moment of torque switching phase.
Fig. 4 is embodiment 1 effect schematic diagram;
Fig. 5 is embodiment 2 effect schematic diagram.
Embodiment
Elaborate to embodiments of the invention below, the present embodiment is implemented under premised on technical solution of the present invention, give detailed mode of execution and concrete operating process, but protection scope of the present invention is not limited to following embodiment.
Embodiment 1
Present embodiments provide 4 grades of emergency brakings and cause target gear consecutive variations 3 ?2, final goal gear is defined as 2, now for falling even number gear.As shown in Figure 3 and Figure 4.
Each gear downshift point under the different acceleration of table 1
In table 1: V_Down [1] is 2 shifting points of falling 1, V_Down [2] is 3 shifting points of falling 2, and V_Down [3] is 4 shifting points of falling 3, and V_Down [5] is 5 shifting points of falling 4, and V_Down [6] is 6 shifting points of falling 5.When the speed of a motor vehicle is less than V_Down, target gear upgrades.
With reference to the real vehicle data of gearshift figure and Fig. 4 of table 1, the present embodiment concrete steps are as follows:
1) Real-Time Monitoring brake pressure signal (BrakePressureHSC), engine speed (EngineSpeedHSC), odd number input shaft rotating speed (NIn1), even number input shaft rotating speed (NIn2), vehicle speed signal (VehiclSpeedHSC), acceleration signal (Vehicle_acc_Filt), actual-gear signal (GearActualHSC), target gear (GearTargetHSC), odd number clutch state (Sate_Tc1), even number clutch state (Sate_Tc2), as shown in Figure 4.
2) normal driving arrives 5 grades, when the speed of a motor vehicle reaches 43km/h, accelerator releasing, and step on braking pedal and make brake pressure be 11.7bar (as 3m6.6s in Fig. 4), the speed of a motor vehicle is 41.4km/h, and acceleration a is 0.458m/s
2, the speed of a motor vehicle declines slow, and target gear is updated to 4, at this moment first fill order's shelves downshift (5 ?4), continues to strengthen brake pressure to 40bar, when the speed of a motor vehicle is 36.45km/h (in as Fig. 4 3m6.9s).Acceleration is 2.26m/s
2, target gear is updated to 3, and when the speed of a motor vehicle is 30.54km/h (in as Fig. 4 3m7.2s), acceleration is 4.46m/s
2, at this moment target gear is updated to 2, when 5 fall 4 and are finished, judges that target gear is 2 grades, then perform 4 and fall 2, what enter many grades of downshifts falls even number gear strategy.
3) enter and fall even number gear logic, first remove intervening gears 3 grades, after 3 grades of shift forks are in place, pre-oiling force feed is carried out to odd number clutch, even number Clutch Control carries out speed governing to motor simultaneously, as the stage (1) in Fig. 3 and stage (2), 3m8.15s to the 3m8.33s of corresponding real vehicle design sketch 4.When engine speed exceedes jack shaft rotating speed, odd number clutch preliminary filling oil pressure completes simultaneously, then by odd number clutch, speed governing is carried out to motor, even number clutch is opened, at this moment 2 grades of instructions are sent, when 2 grades of target approach gear preliminary filling oil pressure speed governing stages in place, as the stage (3) in Fig. 3, enter moment of torsion switching phase when speed governing completes.
4) enter moment of torsion switching phase, odd number clutch moment of torque drops to 2Nm within the nominal time, and even number clutch moment of torque rises to Engine torque within the nominal time, and as the stage (4) in Fig. 3, after the 3m9.43s of Fig. 4, moment of torsion has exchanged.
Embodiment 2
Present embodiments provide 5 grades of emergency brakings and cause target gear consecutive variations 5 ?4 ?3 ?2, final goal gear is defined as 2, now for falling odd number gear.As Fig. 2 and Fig. 5, with reference to the gearshift figure of table 1, concrete implementation step is as follows:
1) Real-Time Monitoring brake pressure signal (BrakePressureHSC), engine speed (EngineSpeedHSC), odd number input shaft rotating speed (NIn1), even number input shaft rotating speed (NIn2), vehicle speed signal (VehiclSpeedHSC), acceleration signal (Vehicle_acc_Filt), actual-gear signal (GearActualHSC), target gear (GearTargetHSC), odd number clutch state (Sate_Tc1), even number clutch state (Sate_Tc2), as shown in Figure 5.
2) normal driving arrives 5 grades, and the speed of a motor vehicle reaches 46.9km/h, accelerator releasing, and step on braking pedal and make brake pressure be 31.7bar (as 1m50.6s in Fig. 5), when the speed of a motor vehicle is 43.53km/h, acceleration a is 1.81m/s
2, target gear is updated to 4, due to downshift time delay, when acceleration becomes 2.97m/s
2, when the speed of a motor vehicle is 40.1km/h (as 1m50.8s in Fig. 5), target gear is updated to 3 again in delay time, owing at this moment there being shift fork action, does not go execution 5 to fall 3, and continuing to strengthen brake pressure is 35.1bar, when acceleration is 4.47m/s
2, when the speed of a motor vehicle is 31.38km/h (as 1m51.3s in Fig. 5), target gear is updated to 2, and at this moment shift fork does not have action, is namely judged to be that 5 fall 2, and what enter many grades of downshifts falls odd number gear strategy.
3) enter and fall odd number gear logic, because target gear and actual-gear be not at same input shaft, can directly carry out upper 2 grades, by the speed governing of odd number Clutch Control engine target speed, as the stage (1) in Fig. 2 and stage (2), 1m51.3s to 1m52.4s in corresponding real vehicle design sketch 5, when engine speed exceedes target axle rotating speed, odd number clutch moment of torque rises, control motor raising speed to slow down, prepare synchronous, as the stage (3) in Fig. 2,1m52.4s to the 1m52.6s in corresponding real vehicle design sketch 5; When engine speed flies over rotating speed of target, control engine peed stable near rotating speed of target, as the stage (4) in Fig. 2,1m52.6s to the 1m52.8s in corresponding real vehicle design sketch 5; ; Even number clutch carries out preliminary filling oil pressure, when preliminary filling oil pressure completes and speed sync completes and enters moment of torsion switching phase.
4) enter moment of torsion switching phase, odd number clutch moment of torque slowly drops to 2Nm, and even number clutch moment of torque slowly rises to Engine torque, and as the stage (5) in Fig. 2, after the 1m52.8s in corresponding real vehicle design sketch 5, moment of torsion has exchanged.
Claims (8)
1. the downshift controlling method that touches on the brake of a fast wet type double-clutch automatic gearbox, it is characterized in that, by monitoring driving states in real time to judge driving intention fast and to calculate aimed acceleration, then by looking into gearshift figure real-time update target gear, and determine that downshift type is for falling odd number gear or falling even number gear according to target gear, to carry out single grade of corresponding downshift or many grades of downshift controls;
Described driving states comprises: the state of the speed of a motor vehicle, two input shaft rotating speeds, target gear, synchronizer action flag bit, two clutch, Engine torque and gas pedal and braking pedal angle.
2. the downshift controlling method that touches on the brake of six fast wet type double-clutch automatic gearboxes according to claim 1, it is characterized in that, described driving intention comprises: when the speed of a motor vehicle is greater than 50km/h, when target gear and actual-gear are all 5, vehicle is in stable state and drives, now:
A) when stepping on brake petal with the power being less than 20Bar, target gear change is comparatively slow, and gearbox has time enough to complete gearshift, at this moment adopts single grade of down-shift strategy, can not cause clutch overheat, can ensure smooth gear shifting;
B) when stepping on brake petal with the power being greater than 20Bar, target gear transformation period is too short, and gearbox has little time to carry out single grade of downshift, and at this moment adopt many grades of downshifts, guarantee can not cause clutch overheat, and smooth gear shifting.
3. the downshift controlling method that touches on the brake of six fast wet type double-clutch automatic gearboxes according to claim 1, it is characterized in that, the described gearshift figure that looks into refers to: the shifting points of each gear tabled look-up according to the speed of a motor vehicle negativeacceleration obtained of differentiating, obtained result of tabling look-up adds the compensation based on atmospheric pressure.
4. the downshift controlling method that touches on the brake of six fast wet type double-clutch automatic gearboxes according to claim 1, it is characterized in that, described recasting is moved downshift and is comprised: fall odd number gear and fall even number gear, downshift gear span is larger, then motor needs the rotating speed of target span that reaches also larger.
5. the downshift controlling method that touches on the brake of six fast wet type double-clutch automatic gearboxes according to claim 4, is characterized in that, the described odd number gear that falls refers to: former gear and target gear at different input shaft upper driving, then directly downshift.
6. the downshift controlling method that touches on the brake of according to claim 4 or 5 six fast wet type double-clutch automatic gearboxes, it is characterized in that, described falls odd number gear, the concrete control stage is as follows:
1) heavy brake target gear determines the stage: jointly being tabled look-up by acceleration and atmospheric pressure obtains downshift point v_down, determines target gear by v_down;
2) in the motor raising speed stage: offgoing clutch moment of torque declines, and clutch is opened, controlling engine speed and carry out raising speed according to targeted rate, judging that downshift type is as falling odd number shelves according to target gear and actual-gear simultaneously;
3) engine speed synchronous phase: offgoing clutch moment of torque rises, controls motor raising speed and slows down, and prepares synchronous; When engine speed is greater than rotating speed of target, control engine peed stable at the above 50rpm of rotating speed of target; Oncoming clutch carries out preliminary filling oil pressure;
4) moment of torsion switching phase: when engine speed and oncoming clutch rotational speed difference are less than 50rpm, and oncoming clutch preliminary filling oil pressure completes, then start moment of torsion and exchange, make oncoming clutch transmission torque, shift process terminates.
7. the downshift controlling method that touches on the brake of six fast wet type double-clutch automatic gearboxes according to claim 4, it is characterized in that, the described even number gear that falls refers to: former gear and target gear are by the driven off by shaft downshift of same input, and the intervening gears on another input shaft carries out transition, to ensure smooth gear shifting.
8. the downshift controlling method that touches on the brake of according to claim 4 or 7 six fast wet type double-clutch automatic gearboxes, it is characterized in that, described falls even number gear, the concrete control stage is as follows:
I) heavy brake target gear determines the stage: jointly being tabled look-up by acceleration and atmospheric pressure obtains downshift point v_down, determines target gear by v_down;
Ii) motor raising speed stage, i.e. former gear speed governing stage: the clutch moment of torque of work at present declines, and clutch is opened, controlling engine speed and carry out raising speed according to targeted rate, judging that downshift type is as falling even number gear according to target gear and actual-gear;
Iii) in the intervening gears speed governing stage: when intervening gears pre-oiling presses and engine speed is raised to more than intervening gears, former gear clutch moment of torsion slowly declines, and the clutch adapter that intervening gears is corresponding controls speed governing;
Iv) engine speed synchronous phase: offgoing clutch moment of torque rises, controls motor raising speed and slows down, and prepares synchronous; When engine speed is greater than rotating speed of target, control engine peed stable at the above 50rpm of rotating speed of target;
V) moment of torsion switching phase: when engine speed and oncoming clutch rotational speed difference are less than 50rpm, and oncoming clutch preliminary filling oil pressure completes, then start moment of torsion and exchange, make oncoming clutch transmission torque, shift process terminates.
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| CN201510489663.9A CN105179676B (en) | 2015-08-11 | 2015-08-11 | The downshift control method that touches on the brake of six fast wet type double-clutch automatic gearboxes |
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| CN201510489663.9A CN105179676B (en) | 2015-08-11 | 2015-08-11 | The downshift control method that touches on the brake of six fast wet type double-clutch automatic gearboxes |
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Cited By (15)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107226085A (en) * | 2017-06-20 | 2017-10-03 | 上海汽车变速器有限公司 | The shift control method of wet dual clutch transmission hybrid vehicle |
| CN107763200A (en) * | 2016-08-18 | 2018-03-06 | 上海汽车集团股份有限公司 | Double-clutch speed changer slides downshift control method and control device |
| CN108501953A (en) * | 2018-06-14 | 2018-09-07 | 重庆长安汽车股份有限公司 | A kind of electric vehicle gear method for handover control, device and automobile |
| CN109572445A (en) * | 2017-09-29 | 2019-04-05 | 比亚迪股份有限公司 | Leapfrog shifting system, leapfrog process for gear and the electric vehicle of electric vehicle |
| CN111720535A (en) * | 2020-06-29 | 2020-09-29 | 安徽江淮汽车集团股份有限公司 | Synchronizer control method, synchronizer control device and storage medium |
| CN112524243A (en) * | 2020-12-04 | 2021-03-19 | 东风汽车集团有限公司 | Pre-synchronization control method for clutches of double-clutch automatic gearbox |
| CN112984099A (en) * | 2021-05-08 | 2021-06-18 | 北京航空航天大学 | Gear shifting control method for changing intention in unpowered gear-up process |
| CN113879310A (en) * | 2021-11-15 | 2022-01-04 | 潍柴动力股份有限公司 | Downshift skip control method |
| CN114909468A (en) * | 2021-02-07 | 2022-08-16 | 广汽埃安新能源汽车有限公司 | Vehicle downshift control method and device and storage medium |
| CN115059757A (en) * | 2022-06-13 | 2022-09-16 | 中国第一汽车股份有限公司 | Control method, computing device and medium for coaxial downshift |
| CN115143277A (en) * | 2022-06-17 | 2022-10-04 | 中国第一汽车股份有限公司 | Gear shifting control method, shifting fork control method and system for double-clutch transmission, double-clutch transmission and automobile with double-clutch transmission |
| CN115217956A (en) * | 2021-06-10 | 2022-10-21 | 广州汽车集团股份有限公司 | Coasting upshift method and transmission |
| CN115217960A (en) * | 2022-01-05 | 2022-10-21 | 广州汽车集团股份有限公司 | Control method for power downshift and dual clutch transmission |
| CN115405686A (en) * | 2022-09-30 | 2022-11-29 | 上海汽车变速器有限公司 | Dual clutch downshift control method, device, storage medium and device |
| CN116877285A (en) * | 2023-09-06 | 2023-10-13 | 潍柴动力股份有限公司 | Engine output torque control method and device |
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| CN107763200A (en) * | 2016-08-18 | 2018-03-06 | 上海汽车集团股份有限公司 | Double-clutch speed changer slides downshift control method and control device |
| CN107226085A (en) * | 2017-06-20 | 2017-10-03 | 上海汽车变速器有限公司 | The shift control method of wet dual clutch transmission hybrid vehicle |
| CN107226085B (en) * | 2017-06-20 | 2019-05-28 | 上海汽车变速器有限公司 | The shift control method of wet dual clutch transmission hybrid vehicle |
| CN109572445A (en) * | 2017-09-29 | 2019-04-05 | 比亚迪股份有限公司 | Leapfrog shifting system, leapfrog process for gear and the electric vehicle of electric vehicle |
| CN108501953A (en) * | 2018-06-14 | 2018-09-07 | 重庆长安汽车股份有限公司 | A kind of electric vehicle gear method for handover control, device and automobile |
| CN108501953B (en) * | 2018-06-14 | 2019-08-27 | 重庆长安新能源汽车科技有限公司 | A kind of electric car gear method for handover control, device and automobile |
| CN111720535A (en) * | 2020-06-29 | 2020-09-29 | 安徽江淮汽车集团股份有限公司 | Synchronizer control method, synchronizer control device and storage medium |
| CN112524243A (en) * | 2020-12-04 | 2021-03-19 | 东风汽车集团有限公司 | Pre-synchronization control method for clutches of double-clutch automatic gearbox |
| CN114909468A (en) * | 2021-02-07 | 2022-08-16 | 广汽埃安新能源汽车有限公司 | Vehicle downshift control method and device and storage medium |
| CN114909468B (en) * | 2021-02-07 | 2024-04-19 | 广汽埃安新能源汽车有限公司 | Vehicle downshift control method, device and storage medium |
| CN112984099A (en) * | 2021-05-08 | 2021-06-18 | 北京航空航天大学 | Gear shifting control method for changing intention in unpowered gear-up process |
| CN115217956B (en) * | 2021-06-10 | 2024-02-02 | 广州汽车集团股份有限公司 | Sliding upshift method and transmission |
| CN115217956A (en) * | 2021-06-10 | 2022-10-21 | 广州汽车集团股份有限公司 | Coasting upshift method and transmission |
| CN113879310A (en) * | 2021-11-15 | 2022-01-04 | 潍柴动力股份有限公司 | Downshift skip control method |
| CN115217960A (en) * | 2022-01-05 | 2022-10-21 | 广州汽车集团股份有限公司 | Control method for power downshift and dual clutch transmission |
| CN115217960B (en) * | 2022-01-05 | 2024-03-26 | 广州汽车集团股份有限公司 | Control method for power downshift and double-clutch transmission |
| CN115059757A (en) * | 2022-06-13 | 2022-09-16 | 中国第一汽车股份有限公司 | Control method, computing device and medium for coaxial downshift |
| CN115143277A (en) * | 2022-06-17 | 2022-10-04 | 中国第一汽车股份有限公司 | Gear shifting control method, shifting fork control method and system for double-clutch transmission, double-clutch transmission and automobile with double-clutch transmission |
| CN115143277B (en) * | 2022-06-17 | 2024-03-22 | 中国第一汽车股份有限公司 | Gear shifting control method and system for double-clutch transmission, double-clutch transmission and automobile with double-clutch transmission |
| CN115405686B (en) * | 2022-09-30 | 2024-02-20 | 上海汽车变速器有限公司 | Dual clutch downshift control method, apparatus, storage medium and device |
| CN115405686A (en) * | 2022-09-30 | 2022-11-29 | 上海汽车变速器有限公司 | Dual clutch downshift control method, device, storage medium and device |
| CN116877285B (en) * | 2023-09-06 | 2023-12-15 | 潍柴动力股份有限公司 | Engine output torque control method and device |
| CN116877285A (en) * | 2023-09-06 | 2023-10-13 | 潍柴动力股份有限公司 | Engine output torque control method and device |
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