CN105179676B - The downshift control method that touches on the brake of six fast wet type double-clutch automatic gearboxes - Google Patents
The downshift control method that touches on the brake of six fast wet type double-clutch automatic gearboxes Download PDFInfo
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- CN105179676B CN105179676B CN201510489663.9A CN201510489663A CN105179676B CN 105179676 B CN105179676 B CN 105179676B CN 201510489663 A CN201510489663 A CN 201510489663A CN 105179676 B CN105179676 B CN 105179676B
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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
-
- 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
A kind of downshift control method that touches on the brake of six fast wet type double-clutch automatic gearbox, quickly judge driving intention by monitoring driving states in real time and calculate aimed acceleration, then by looking into gearshift figure real-time update target gear, and even number gear for drop odd number gear or is dropped come the type that determines to downshift according to target gear, to carry out corresponding single grade of downshift or multi gear downshift control；The present invention combines the architectural characteristic of wet clutch, and in order to ensure vehicle smooth-going downshift, multi gear downshift in heavy brake down-shift strategy is developed, and is verified in real vehicle.
Description
Technical field
The present invention relates to a kind of technology of automotive automation control field, specifically a kind of double clutches of six fast wet types are certainly
The downshift control method that touches on the brake of dynamic speed changer.
Background technology
DCT (DualClutchTransmission, double-clutch speed changer) is to be replaced on the basis of MT by TCU and valve body
Hand-gear shift lever, and in order to ensure that power does not interrupt the automatic change of one kind being controlled from two clutches to power transmission
Fast device.Tacit agreement cooperation between two clutches, the raising of automobile ride and dynamic property is, it is necessary to high-precision control strategy.
In vehicle travel process, to avoid danger, how soon we often run into many emergency situations, it is necessary to take brake hard
It is the emphasis of research that speed, which smoothly makes vehicle stop,.The weight that brake pedal steps down, the selection for the type that downshifts is one
Individual difficult point, downshift type selecting is improper, can influence to drive sense and shorten the life-span of double clutches.
When vehicle, driver is touched on the brake again with faster rate during smooth ride, and double-clutch automatic gearbox can be carried out
Downshift is to obtain bigger power, and when touching on the brake again, speed declines rapidly, at this moment if using single grade of downshift of order, clutch
Device frequently interacts, and easily causes clutch overheat, and the overlong time that downshifts, and driver can feel there is pause and transition in rhythm or melody sense.
When driver touches on the brake again, TCU determines the downshift point each to downshift according to the acceleration magnitude of vehicle.When adding
When speed is bigger, relatively, target gear change is fast for the shifting points between adjacent gear positions, and synchronizer has little time to act, and enters
And there is the situation of drop multi gear.
Found by the retrieval to prior art, Chinese patent literature CN103758995A, publication date 2014.04.30,
A kind of dual-clutch transmission brake downshift control method is disclosed, including：Obtain brake pedal pressure, gas pedal is opened
Degree, speed, vehicle acceleration and current gear；The percentage that brakes is obtained according to brake pedal pressure, according to brake percentage
Table look-up to obtain gain coefficient；According to speed and gain coefficient, speed of actually being put into gear；According to actually putting into gear speed and throttle is stepped on
Plate aperture, table look-up to obtain first object gear；Judge whether first object gear is less than current gear, and gas pedal aperture
Whether 0 is equal to；If it is, according to brake percentage and vehicle acceleration, it is determined that enter common brake downshift control model or
Person enters the downshift control model that touches on the brake again；If entering common brake downshift control model, common brake downshift control is performed
System；If into the downshift control model that touches on the brake again, the downshift control that touches on the brake again is performed.But the technology downshifts without multi gear
Clutch control strategy, easily cause clutch sliding wear and clutch overheat during downshift.
The content of the invention
In vehicle travel process, we often run into many emergency situations, it is necessary to take brake hard to avoid endangering
Danger, how quick and stable make vehicle stop be research emphasis.The weight that brake pedal steps down, for downshift type
Selection is a difficult point, and downshift type selecting is improper, can influence to drive sense and shorten the life-span of double clutches, the present invention is for existing
There are technology above shortcomings, propose a kind of downshift control method that touches on the brake of six fast wet type double-clutch automatic gearbox, when
Vehicle is in normal driving process, because certain danger situation driver with the power comparatively fast increased steps on brake pedal, is caused double
Clutch speed changer is downshifted automatically, steadily rapidly to reduce the effect that speed reaches fast braking.
The present invention is achieved by the following technical solutions：
It is of the invention quickly to judge driving intention by monitoring driving states in real time and calculate aimed acceleration, then
By looking into gearshift figure real-time update target gear, and it is even for drop odd number gear or drop come the type that determines to downshift according to target gear
Several gears, to carry out corresponding single grade of downshift or multi gear downshift control.
Described driving states include：Speed, two input shaft rotating speeds, target gear, synchronizer action flag bit, it is double from
State, engine torque and the gas pedal and brake pedal angle of conjunction.
Described driving intention includes：When speed is more than 50km/h, and target gear and actual-gear are all 5, at vehicle
Driven in stable state, now：
A) brake pedal is stepped on the power less than 20Bar, target gear change is slower, and gearbox has time enough to complete to change
Gear, at this moment using single grade of down-shift strategy, will not cause clutch overheat, it is ensured that smooth gear shifting；
B) brake pedal is stepped on the power more than 20Bar, target gear transformation period is too short, and gearbox has little time to carry out single grade
Downshift, is at this moment downshifted, guarantee will not cause clutch overheat, and smooth gear shifting using multi gear.
Described gearshift figure of looking into refers to：The negativeacceleration that the shifting points of each gear are differentiated to obtain according to speed
Tabled look-up, the result obtained by tabling look-up adds the compensation based on atmospheric pressure, with different suitable for plateau or level land etc.
Road conditions.
Downshift is moved in described recasting to be included：Odd number gear and drop even number gear drop, and downshift gear span is bigger, then sends out
The rotating speed of target span that motivation needs reach is also bigger.
Described drop odd number gear refers to：Former gear and target gear are driven on different input shafts, such as 5-2, can
It is specific to control the stage as follows directly to be downshifted：
1) heavy brake target gear determines the stage：Tabled look-up to obtain downshift point v_down jointly by acceleration and atmospheric pressure, led to
V_down is crossed to determine target gear.
2) engine ramp-up stage：Offgoing clutches (clutch to be separated) moment of torsion declines, and clutch is opened, control
Engine speed carrys out raising speed according to targeted rate, while judges to downshift type according to target gear and actual-gear for drop odd number
Shelves.
3) engine speed synchronous phase：Offgoing clutch moment of torque rises, and control engine raising speed slows down, and prepares same
Step；When engine speed is more than rotating speed of target, control engine peed stable is in rotating speed of target above 50rpm；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 speeds difference are less than 50rpm, and oncoming
Clutch preliminary filling oil pressure is completed, then starts moment of torsion exchange, make oncoming clutch transmission torques, shift process terminates.
Described drop even number gear refers to：The downshift that former gear and target gear are driven by same input shaft, such as 4 drops
2；To ensure that smooth gear shifting needs the intervening gears on another input shaft to carry out transition, for example 4 drops 2 need 3 grades of transition, therefore
Difference of the drop even number gear with dropping odd number gear is that the transient process of intervening gears, specific to control the stage as follows：
I) heavy brake target gear determines the stage：Tabled look-up to obtain downshift point v_down jointly by acceleration and atmospheric pressure, led to
V_down is crossed to determine target gear.
Ii) engine ramp-up stage (the former gear speed governing stage)：The clutch moment of torque of work at present declines, and clutch is beaten
Open, control engine speed carrys out raising speed according to targeted rate, judges that downshift type is even for drop according to target gear and actual-gear
Several gears；
Iii) the intervening gears speed governing stage：When intervening gears pre-oiling presses and engine speed is raised to more than intervening gears
When, former gear clutch moment of torsion slowly declines, and clutch corresponding to intervening gears is taken over to control speed governing；
Iv) engine speed synchronous phase：Offgoing clutch moment of torque rises, and control engine raising speed slows down, and prepares
It is synchronous,；When engine speed is more than rotating speed of target, control engine peed stable is in rotating speed of target above 50rpm；
V) moment of torsion switching phase：When engine speed and oncoming clutch rotational speeds difference are less than 50rpm, and oncoming
Clutch preliminary filling oil pressure is completed, then starts moment of torsion exchange, make oncoming clutch transmission torques, shift process terminates.
Technique effect
Compared with prior art, the shifting points that the present invention is determined by continuous real train test, for target gear really
Surely the actual intention of driver is more conform with, engine speed control strategy makes engine fast and stable in boosting velocity procedure, from
The control of clutch moment of torsion smoothes out clutch moment of torque exchange process, while clutch temp rises slowly, and having illustrated effective prevents
Clutch overheat, in a word high quality, it is quick, smoothly achieved whole heavy brake downshift.
Brief description of the drawings
Fig. 1 is heavy brake process downshift control flow chart；
When Fig. 2 is that odd number gear drops in heavy brake, the change between rotating speed to be separated, rotating speed to be combined, engine speed
Variation tendency schematic diagram between change trend schematic diagram and axle axle moment of torsion to be separated, axle axle moment of torsion to be combined, engine torque；
In figure：(1) (2) are preparation synchronous phase according to targeted rate ramp-up stage, (3) for engine speed, and (4) are steady
Determine the engine speed stage, (5) are clutch moment of torque switching phase.
When Fig. 3 is that even number gear drops in heavy brake, the change between rotating speed to be separated, rotating speed to be combined, engine speed
Variation tendency schematic diagram between change trend schematic diagram and axle moment of torsion to be separated, axle moment of torsion to be combined, engine torque；
In figure：(1) it is the former gear speed governing stage, (2) are the intervening gears speed governing stage, and (3) are to prepare synchronous phase, (4)
To stablize the engine speed stage, (5) are clutch moment of torque switching phase.
Fig. 4 is the effect diagram of embodiment 1；
Fig. 5 is the effect diagram of embodiment 2.
Embodiment
Embodiments of the invention are elaborated below, the present embodiment is carried out lower premised on technical solution of the present invention
Implement, give detailed embodiment and specific operating process, but protection scope of the present invention is not limited to following implementation
Example.
Embodiment 1
Present embodiments providing 4 grades of brake hards causes target gear consecutive variations 3-2, and final goal gear is defined as 2,
It is now drop even number gear.As shown in Figure 3 and Figure 4.
Each gear downshift point under 1 different acceleration of table
In table 1：V_Down [1] is the shifting points of 2 drops 1, and V_Down [2] is the shifting points of 3 drops 2, and V_Down [3] is 4 drops 3
Shifting points, V_Down [5] be 5 drop 4 shifting points, V_Down [6] be 6 drop 5 shifting points.When speed is less than V_Down,
Target gear updates.
With reference to the gearshift figure of table 1 and Fig. 4 real vehicle data, the present embodiment comprises the following steps that：
1) in real time monitoring brake pressure signal (BrakePressureHSC), engine speed (EngineSpeedHSC),
Odd input shaft rotating speed (NIn1), even number input shaft rotating speed (NIn2), GES (VehiclSpeedHSC), acceleration signal
(Vehicle_acc_Filt), actual-gear signal (GearActualHSC), target gear (GearTargetHSC), odd number from
Clutch state (Sate_Tc1), even number clutch state (Sate_Tc2), as shown in Figure 4.
2) normal driving reaches 5 grades, when speed reaches 43km/h, and accelerator releasing, stepping on brake pedal makes the brake pressure be
11.7bar (3m6.6s in such as Fig. 4), speed 41.4km/h, acceleration a are 0.458m/s2, slow down under speed, target gear
Be updated to 4, at this moment first carry out single grade of downshift (5-4), continue increase brake pressure arrive 40bar, when speed for 36.45km/h (such as
3m6.9s in Fig. 4).Acceleration is 2.26m/s2, target gear is updated to 3, when speed is 30.54km/h (in such as Fig. 4
3m7.2s), acceleration 4.46m/s2, at this moment target gear be updated to 2, when 5 drops 4 are finished, judge target gear for 2
Shelves, then 4 drops 2 are performed, into the drop even number gear strategy of multi gear downshift.
3) enter drop even number gear logic, first remove 3 grades of intervening gears, after 3 grades of shift forks are in place, odd number clutch is entered
Row pre-oiling presses oil, while even number clutch control carries out speed governing to engine, right such as the stage (1) and stage (2) in Fig. 3
3m8.15s to the 3m8.33s for the real vehicle design sketch 4 answered.When engine speed exceedes middle rotating speed, while odd number clutch is pre-
Oil-filled pressure is completed, then speed governing is carried out to engine by odd number clutch, and even number clutch is opened, and at this moment sends 2 grades of instructions,
When 2 grades it is in place enter the target gear pre-oiling pressure speed governing stage, such as the stage (3) in Fig. 3, handed over when speed governing is completed to enter moment of torsion
Change the stage.
4) moment of torsion switching phase is entered, odd number clutch moment of torque drops to 2Nm, even number clutch moment of torque within the nominal time
Engine torque is risen within the nominal time, such as the stage (4) in Fig. 3, after Fig. 4 3m9.43s, moment of torsion, which exchanges, to be completed.
Embodiment 2
Present embodiments providing 5 grades of brake hards causes target gear consecutive variations 5-4-3-2, and final goal gear determines
It is now drop odd number gear for 2.It is as follows with reference to the gearshift figure of table 1, specific implementation step such as Fig. 2 and Fig. 5：
1) in real time monitoring brake pressure signal (BrakePressureHSC), engine speed (EngineSpeedHSC),
Odd input shaft rotating speed (NIn1), even number input shaft rotating speed (NIn2), GES (VehiclSpeedHSC), acceleration signal
(Vehicle_acc_Filt), actual-gear signal (GearActualHSC), target gear (GearTargetHSC), odd number from
Clutch state (Sate_Tc1), even number clutch state (Sate_Tc2), as shown in Figure 5.
2) normal driving reaches 5 grades, and speed reaches 46.9km/h, accelerator releasing, and stepping on brake pedal makes the brake pressure be
31.7bar (1m50.6s in such as Fig. 5), when speed is 43.53km/h, acceleration a is 1.81m/s2, target gear is updated to 4,
Because downshift is delayed, when acceleration is changed into 2.97m/s2, when speed is 40.1km/h (1m50.8s in such as Fig. 5), target gear exists
3 are updated to again in delay time, due at this moment there is shift fork action, does not go to perform 5 drops 3, continuing increasing brake pressure is
35.1bar, when acceleration is 4.47m/s2, when speed is 31.38km/h (1m51.3s in such as Fig. 5), target gear is updated to 2,
At this moment shift fork does not act, that is, is determined as 5 drops 2, into the drop odd number gear strategy of multi gear downshift.
3) drop odd number gear logic is entered, can be direct because target gear and actual-gear be not in same input shaft
2 grades are carried out, by odd number clutch control engine target speed speed governing, such as the stage (1) and stage (2) in Fig. 2, is corresponded to
Real vehicle design sketch 5 in 1m51.3s to 1m52.4s, when engine speed exceedes target rotating speed, on odd number clutch moment of torque
Rise, control engine raising speed slows down, prepare it is synchronous, such as the stage (3) in Fig. 2, the 1m52.4s in corresponding real vehicle design sketch 5
To 1m52.6s；When engine speed flies over rotating speed of target, control engine peed stable is near rotating speed of target, in Fig. 2
Stage (4), 1m52.6s to the 1m52.8s in corresponding real vehicle design sketch 5；；Even number clutch carries out preliminary filling oil pressure, when pre-
Oil-filled pressure is completed and speed sync is completed to enter moment of torsion switching phase.
4) moment of torsion switching phase is entered, odd number clutch moment of torque slowly drops to 2Nm, and even number clutch moment of torque slowly rises
To engine torque, such as the stage (5) in Fig. 2, after the 1m52.8s in corresponding real vehicle design sketch 5, moment of torsion, which exchanges, to be completed.
Claims (2)
1. the downshift control method that touches on the brake of a kind of six fast wet type double-clutch automatic gearbox, it is characterised in that by supervising in real time
Driving states are controlled quickly to judge driving intention and calculate aimed acceleration, then by looking into gearshift figure real-time update target
Gear, and even number gear for drop odd number gear or is dropped come the type that determines to downshift according to target gear, corresponding to carrying out
Single grade of downshift or multi gear downshift control；
Described driving states include：Speed, two input shaft rotating speeds, target gear, synchronizer action flag bit, double clutches
State, engine torque and gas pedal and brake pedal angle；
Described driving intention includes：When speed is more than 50km/h, and target gear and actual-gear are all 5, vehicle is in steady
State drives, now：
A) when stepping on brake pedal with the power less than 20Bar, target gear change is slower, and gearbox has time enough to complete to change
Gear, at this moment using single grade of down-shift strategy, will not cause clutch overheat, it is ensured that smooth gear shifting；
B) when stepping on brake pedal with the power more than 20Bar, target gear transformation period is too short, and gearbox has little time to carry out single grade of drop
Shelves, are at this moment downshifted, guarantee will not cause clutch overheat, and smooth gear shifting using multi gear；
Described multi gear downshift includes：Odd number gear and drop even number gear drop, and downshift gear span is bigger, then engine needs
The rotating speed of target span to be reached is also bigger, wherein：
Described drop odd number gear refers to：Former gear and target gear are driven on different input shafts, then are directly downshifted；
Described drop even number gear refers to：The downshift that former gear and target gear are driven by same input shaft, and another input
Intervening gears on axle carry out transition, to ensure smooth gear shifting；
Described drop odd number gear, it is specific to control the stage as follows：
1) heavy brake target gear determines the stage：Tabled look-up to obtain downshift point v_down jointly by acceleration and atmospheric pressure, pass through v_
Down determines target gear；
2) engine ramp-up stage：Offgoing clutch moment of torque declines, and clutch is opened, and control engine speed is according to target
Speed carrys out raising speed, while judges to downshift type according to target gear and actual-gear for drop odd number shelves；
3) engine speed synchronous phase：Offgoing clutch moment of torque rises, and control engine raising speed slows down, and prepares synchronous；
When engine speed is more than rotating speed of target, control engine peed stable is in rotating speed of target above 50rpm；Oncoming clutches
Device carries out preliminary filling oil pressure；
4) moment of torsion switching phase：When engine speed and oncoming clutch rotational speeds difference are less than 50rpm, and oncoming clutches
Device preliminary filling oil pressure is completed, then starts moment of torsion exchange, make oncoming clutch transmission torques, shift process terminates；
Described drop even number gear, it is specific to control the stage as follows：
I) heavy brake target gear determines the stage：Tabled look-up to obtain downshift point v_down jointly by acceleration and atmospheric pressure, pass through v_
Down determines target gear；
Ii) engine ramp-up stage, i.e., former gear speed governing stage：The clutch moment of torque of work at present declines, and clutch is opened, control
Engine speed processed carrys out raising speed according to targeted rate, judges to downshift type according to target gear and actual-gear for drop even number shelves
Position；
Iii) 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 clutch corresponding to intervening gears is taken over to control speed governing；
Iv) engine speed synchronous phase：Offgoing clutch moment of torque rises, and control engine raising speed slows down, and prepares synchronous；
When engine speed is more than rotating speed of target, control engine peed stable is in rotating speed of target above 50rpm；
V) moment of torsion switching phase：When engine speed and oncoming clutch rotational speeds difference are less than 50rpm, and oncoming clutches
Device preliminary filling oil pressure is completed, then starts moment of torsion exchange, make oncoming clutch transmission torques, shift process terminates.
2. the downshift control method that touches on the brake of six fast wet type double-clutch automatic gearbox according to claim 1, its feature
It is that described gearshift figure of looking into refers to：The negativeacceleration that the shifting points of each gear differentiate to obtain according to speed is carried out
Table look-up, the result obtained by tabling look-up adds the compensation based on atmospheric pressure.
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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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| CN105179676B true CN105179676B (en) | 2017-11-17 |
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| CN103047408B (en) * | 2012-12-24 | 2015-12-02 | 三一重工股份有限公司 | A kind of automatic gearbox gear shifting method and vehicle |
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