CN103758995A - Braking kick-down control method of double clutch automatic transmission - Google Patents
Braking kick-down control method of double clutch automatic transmission Download PDFInfo
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- CN103758995A CN103758995A CN201410038453.3A CN201410038453A CN103758995A CN 103758995 A CN103758995 A CN 103758995A CN 201410038453 A CN201410038453 A CN 201410038453A CN 103758995 A CN103758995 A CN 103758995A
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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
- F16H59/20—Kickdown
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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
- F16H61/00—Control functions within control units of change-speed- or reversing-gearings for conveying rotary motion ; Control of exclusively fluid gearing, friction gearing, gearings with endless flexible members or other particular types of gearing
- F16H61/02—Control functions within control units of change-speed- or reversing-gearings for conveying rotary motion ; Control of exclusively fluid gearing, friction gearing, gearings with endless flexible members or other particular types of gearing characterised by the signals used
- F16H61/0293—Control functions within control units of change-speed- or reversing-gearings for conveying rotary motion ; Control of exclusively fluid gearing, friction gearing, gearings with endless flexible members or other particular types of gearing characterised by the signals used the signals being purely mechanical
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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
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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
- F16H61/68—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 specially adapted for stepped gearings
- F16H61/684—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 specially adapted for stepped gearings without interruption of drive
- F16H61/688—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 specially adapted for stepped gearings without interruption of drive with two inputs, e.g. selection of one of two torque-flow paths by clutches
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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
- F16H2061/0474—Smoothing ratio shift by smoothing engagement or release of positive clutches; Methods or means for shock free engagement of dog clutches
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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
- F16H2312/00—Driving activities
- F16H2312/16—Coming to a halt
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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
- F16H2710/00—Control devices for speed-change mechanisms, the speed change control is dependent on function parameters of the gearing
- F16H2710/04—Control dependent on 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
- F16H2710/00—Control devices for speed-change mechanisms, the speed change control is dependent on function parameters of the gearing
- F16H2710/24—Control dependent on torque
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- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Control Of Transmission Device (AREA)
Abstract
The invention discloses a braking kick-down control method of a double clutch automatic transmission. The braking kick-down control method includes the steps that the pressure on a braking pedal, the opening degree of an accelerator pedal, the vehicle speed, the acceleration of the whole vehicle and the current gear position are acquired; the braking percentage is obtained according to the pressure on the braking pedal, and the gain coefficient is obtained by looking up a table of the braking percentage; according to the vehicle speed and the gain coefficient, the actual gear engaging vehicle speed is obtained; according to the actual gear engaging vehicle speed and the opening degree of the accelerator pedal, a first target gear position is obtained by looking up a table; whether the first target gear position is smaller than the current gear position or not is judged, and whether the opening degree of the accelerator pedal is equal to zero or not is judged; if yes, according to the braking percentage and the acceleration of the whole vehicle, it is determined that a common braking kick-down control mode is executed or a re-treading braking kick-down control mode is executed; if the common braking kick-down control mode is executed, common braking kick-down control is executed; if the re-treading braking kick-down control mode is executed, the re-treading braking kick-down control is executed. By the adoption of the method, it is guaranteed that the gear position can be fast decreased, and the driving comfort and the driving safety are improved.
Description
Technical field
The present invention relates to automotive transmission technical field, relate in particular to a kind of dual-clutch transmission brake downshift controlling method.
Background technique
Typical wet-type double-clutch automatic speed-change case has inside and outside two clutches.Outer clutch is connected with outer input shaft, is controlling odd number gear, and outer clutch is called again first clutch; Internal clutch is connected with interior input shaft, is controlling even number gear and the gear that reverses gear (being R gear gear), and internal clutch is called again second clutch.Utilize electrichydraulic control, drive solenoid valve to realize the alternation of gear variation and clutch, final realization gearshift automation.
Wet-type double-clutch automatic speed-change case does not have the function of specially the downshift process under brake intervention being carried out to system control at present, owing to not considering the impact of brake, institute is so that gear can not lower rapidly, probably cause occurring the car load irregularity that travels in the process of brake downshift, the sliding wear overlong time of clutch causes the overheated phenomenon of clutch, reduced the Security of car load, the travelling comfort of driving and the operating life of clutch, especially in the process heavily touching on the brake, likely cause car load load to increase suddenly, engine speed sharply declines, even there is suppressing the generation of flame-out situation, further reduced the travelling comfort of Security and the driving of car load.
Summary of the invention
The object of the invention is to overcome deficiency of the prior art, a kind of dual-clutch transmission brake downshift controlling method is provided.
For achieving the above object, technological scheme of the present invention is:
A dual-clutch transmission brake downshift controlling method, it comprises:
Obtain brake pedal pressure, gas pedal aperture, the speed of a motor vehicle, car load acceleration and current gear;
According to described brake pedal pressure, obtain the percentaeg that brakes, and table look-up and obtain gain coefficient according to described brake percentaeg;
According to the described speed of a motor vehicle and described gain coefficient, obtain the actual speed of a motor vehicle of putting into gear;
According to the described actual speed of a motor vehicle and the described gas pedal aperture of putting into gear, table look-up and obtain first object gear;
Judge whether described first object gear is less than current gear, and whether described gas pedal aperture equals 0; If so,, according to described brake percentaeg and described car load acceleration, determine and 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, carry out common brake downshift and control;
If enter the downshift control mode that heavily touches on the brake, carry out the downshift that heavily touches on the brake and control.
Preferably, described according to described brake percentaeg and described car load acceleration, determine to enter common brake downshift control mode or enter the downshift control mode that heavily touches on the brake to comprise:
Judge whether described brake percentaeg is greater than the percentaeg threshold value of setting, and whether described car load acceleration is less than the acceleration rate threshold of setting;
If not, determine and enter common brake downshift control mode;
If so, determine and enter the standard downshift control mode that heavily touches on the brake;
Whether judgement remains the described standard downshift control mode that heavily touches on the brake in the very first time section of setting;
If so, determine and enter the described heavy downshift control mode that touches on the brake;
If not, determine and enter described common brake downshift control mode.
Preferably, the percentaeg threshold value of described setting is 5%, and the acceleration rate threshold of described setting is-6m/s
2; The very first time section of described setting is 3 sampling periods, and 1 sampling period is 10ms.
Preferably, the common brake downshift of described execution is controlled and is comprised:
According to the described speed of a motor vehicle, car load acceleration, gain coefficient and gas pedal aperture, obtain pre-hung gear;
According to described pre-hung gear and described first object gear, table look-up and obtain the second target gear that selector fork need to be switched to;
Send selector fork switching command, control selector fork and switch to described the second target gear;
Judge whether described the second target gear is odd number gear;
If, described first clutch is carried out to preacceleration inflation, and the pressure of working as described first clutch is more than or equal to the first pressure threshold of setting, and when described selector fork has been switched to described the second target gear, continuation is carried out pressurising to described first clutch, until during the second pressure threshold that the pressure of described first clutch equals to set, the oil-filled amount of minimizing to second clutch, make the pressure decreased of described second clutch, and continue described first clutch to carry out pressurising, until the moment of torsion of described first clutch transmission is while being greater than the clean moment of torsion of motor, stop described second clutch to carry out pressurising,
The rotating speed of control engine, and make the rotating speed of the driven disc that the first object rotating speed of described motor is described first clutch;
In the time of in the margin of error that the rotating speed of described motor and the difference of described first object rotating speed are being set, the oil-filled amount of maintenance to described first clutch, make the pressure of described first clutch keep stable, stop the rotating speed of motor to control simultaneously, and exit described common brake downshift control mode.
Preferably, the common brake downshift of described execution is controlled and is also comprised:
If described the second target gear is even number gear or the gear that reverses gear, described second clutch is carried out to preacceleration inflation, and the pressure of working as described second clutch is greater than the first pressure threshold of described setting, and when described selector fork has been switched to described the second target gear, continuation is carried out pressurising to described second clutch, until the pressure of described second clutch is while equaling the second pressure threshold of described setting, the oil-filled amount of minimizing to first clutch, make the pressure decreased of described first clutch, and continue described second clutch to carry out pressurising, until the moment of torsion of described second clutch transmission is while being greater than engine net torque, stop described first clutch to carry out pressurising,
The rotating speed of control engine, and make the rotating speed of the driven disc that the second rotating speed of target of described motor is described second clutch;
When the rotating speed of described motor and the difference of described the second rotating speed of target in the margin of error in described setting time, the oil-filled amount of maintenance to described second clutch, make the pressure of described second clutch keep stable, stop the rotating speed of motor to control simultaneously, and exit described common brake downshift control mode.
Preferably, described according to the described speed of a motor vehicle, car load acceleration, gain coefficient and gas pedal aperture, obtain pre-hung gear and comprise:
According to the described speed of a motor vehicle and car load acceleration, obtain the pre-hung speed of keeping off a car;
According to keep off a car speed and described gain coefficient of described pre-hung, obtain the actual pre-hung speed of keeping off a car;
According to described actual pre-hung keep off a car speed and described gas pedal aperture, table look-up acquisition described pre-hung gear.
Preferably, the first pressure threshold of described setting is 80kpa; The second pressure threshold of described setting is 250kpa.
Preferably, the described execution downshift that heavily touches on the brake is controlled and to be comprised:
Stop described first clutch and described second clutch to carry out pressurising;
According to the described speed of a motor vehicle, car load acceleration, gain coefficient and gas pedal aperture, obtain pre-hung gear, and table look-up and obtain the second target gear that selector fork need to be switched to according to described pre-hung gear and described first object gear;
Send selector fork switching command, control selector fork and switch to described the second target gear;
After the second time period of setting, exit the described heavy downshift control mode that touches on the brake.
Preferably, described according to the described speed of a motor vehicle, car load acceleration, gain coefficient and gas pedal aperture, obtain pre-hung gear and comprise:
According to the described speed of a motor vehicle and car load acceleration, obtain the pre-hung speed of keeping off a car;
According to keep off a car speed and described gain coefficient of described pre-hung, obtain the actual pre-hung speed of keeping off a car;
According to described actual pre-hung keep off a car speed and described gas pedal aperture, table look-up acquisition described pre-hung gear.
Preferably, the second time period of described setting is 3 sampling periods.
Beneficial effect of the present invention is, dual-clutch transmission brake downshift controlling method of the present invention, has considered the impact of brake, can guarantee that gear can lower fast, has realized the output of power free of discontinuities and has driven smoothness; In addition, described controlling method has been carried out effective differentiation to common brake downshift and the downshift that heavily touches on the brake: for common brake downshift control mode, be conducive to avoid clutch because sliding wear overlong time causes clutch overheated, extended the operating life of clutch; For the control mode that heavily touches on the brake, avoided owing to heavily touching on the brake, cause car load load to increase suddenly, engine speed sharply declines and even suppresses the generation of flame-out situation, has guaranteed driving comfortability and Security.
Accompanying drawing explanation
Fig. 1 shows the flow chart of embodiment of the present invention dual-clutch transmission brake downshift controlling method;
Fig. 2 shows in the embodiment of the present invention according to described brake percentaeg and described car load acceleration, determines and enters common brake downshift control mode or enter the flow chart of the downshift control mode that heavily touches on the brake:
Fig. 3 shows the flow chart of the method for obtaining the gear that selector fork need to be switched to;
Fig. 4 shows in the embodiment of the present invention when selector fork need to be switched to odd number gear, carries out the flow chart of the method that common brake downshift controls;
Fig. 5 shows in the embodiment of the present invention when selector fork need to be switched to even number gear or reverse gear gear, carries out the flow chart of the method that common brake downshift controls;
Fig. 6 shows the flow chart of carrying out the method for the downshift control that heavily touches on the brake in the embodiment of the present invention.
Embodiment
Describe embodiments of the invention below in detail, described embodiment's example is shown in the drawings, and wherein same or similar label represents same or similar element or has the element of identical or similar functions from start to finish.Below by the embodiment who is described with reference to the drawings, be exemplary, only for explaining the present invention, and can not be interpreted as limitation of the present invention.
Dual-clutch transmission brake downshift controlling method of the present invention, has considered the impact of brake, can guarantee that gear can lower fast, has realized the output of power free of discontinuities and has driven smoothness; In addition, described controlling method has been carried out effective differentiation to common brake downshift and the downshift that heavily touches on the brake: for common brake downshift control mode, used control of engine speed, control of engine speed has shortened the lock in time of clutch driving plate rotating speed and driven disc rotating speed, be conducive to avoid clutch because sliding wear overlong time causes clutch overheated, extended the operating life of clutch; For the control mode that heavily touches on the brake, stop respectively first clutch and second clutch to carry out oil-filled, thereby make first clutch and the second clutch all cannot transmitting torque, avoided owing to heavily touching on the brake, cause car load load to increase suddenly, engine speed sharply declines and even suppresses the generation of flame-out situation, has guaranteed driving comfortability and Security.
As shown in Figure 1, be the flow chart of embodiment of the present invention dual-clutch transmission brake downshift controlling method, described dual-clutch transmission brake downshift controlling method comprises the following steps:
Step 101: obtain brake pedal pressure, gas pedal aperture, the speed of a motor vehicle, car load acceleration and current gear.
Particularly, brake pedal pressure can obtain by the pressure transducer being arranged on braking pedal, and gas pedal aperture can obtain by being arranged on the position transducer at gas pedal place, and the speed of a motor vehicle is obtained by vehicle speed sensor, and car load acceleration can pass through
calculate, wherein v
t1for t
1the speed of a motor vehicle that sampling instant collects, v
t0for t
0the speed of a motor vehicle that sampling instant collects, t
0sampling instant is t
1a upper sampling instant of sampling instant; Current gear can obtain by the position transducer for detection of gear level position.Because the obtain manner of above-mentioned each parameter is content well-known to those skilled in the art, so no longer launch explanation at this.
Step 102: obtain according to described brake pedal pressure the percentaeg that brakes, and table look-up and obtain gain coefficient according to described brake percentaeg.
Particularly, brake percentaeg can pass through
calculate, wherein F represents current brake pedal pressure, F
maxand F
minrepresent respectively pressure maximum and the pressure minimum of braking pedal, described pressure maximum and pressure minimum are the intrinsic parameter of braking pedal, by gathering the speed of a motor vehicle, brake pedal pressure, calculate brake percentaeg here, there are data and be convenient to gather, workable advantage.
In addition, utilize brake percentaeg to obtain gain coefficient by the mode of tabling look-up, described table, the corresponding relation braking between percentaeg and gain coefficient by experiment data is demarcated.
Step 103: according to the described speed of a motor vehicle and described gain coefficient, obtain the actual speed of a motor vehicle of putting into gear, and according to the described actual speed of a motor vehicle and the described gas pedal aperture of putting into gear, table look-up and obtain first object gear.
Particularly, the described actual speed of a motor vehicle of putting into gear equals the product of the described speed of a motor vehicle and gain coefficient; In addition, first object gear is also that the mode by tabling look-up is obtained, this table, i.e. and actual corresponding relation of putting into gear between the speed of a motor vehicle and gas pedal aperture and described first object gear, also data are demarcated by experiment.
Step 104: judge whether described first object gear is less than current gear, and whether described gas pedal aperture equals 0.Here, by judging whether first object gear is less than current gear and whether accelerator pedal, as the Rule of judgment that enters the control of brake downshift, has application strong, is easy to the advantage realizing.
Step 105: if according to described brake percentaeg and described car load acceleration, determine and enter common brake downshift control mode or enter the downshift control mode that heavily touches on the brake.
Particularly, if described first object gear is less than current gear, and whether described gas pedal aperture equal 0, means and be now about to enter downshift pattern; Then, the present invention is according to brake percentaeg and these two parameters of car load acceleration, further determine that car load enters common brake downshift control mode or enters the downshift control mode that heavily touches on the brake, about how to judge, enter the method that common brake downshift control mode still enters the downshift control mode that heavily touches on the brake, will in conjunction with Fig. 2, be described in detail hereinafter.
Step 106: if enter common brake downshift control mode, carry out common brake downshift and control.The method that the common brake downshift of described execution is controlled will be described in detail in conjunction with Fig. 4 and Fig. 5 hereinafter.
Step 107: if enter the downshift control mode that heavily touches on the brake, carry out the downshift that heavily touches on the brake and control.The described execution method that downshift controls that heavily touches on the brake will be described in detail in conjunction with Fig. 6 hereinafter.
As shown in Figure 2, according to described brake percentaeg and described car load acceleration in the embodiment of the present invention, determine to enter common brake downshift control mode or to enter the flow chart of the downshift control mode that heavily touches on the brake, described determine to enter common brake downshift control mode or enter the downshift control mode that heavily touches on the brake comprise the following steps:
Step 201: judge whether described brake percentaeg is greater than the percentaeg threshold value of setting, and whether described car load acceleration is less than the acceleration rate threshold of setting.Here, the percentaeg threshold value of described setting is preferably 5%, and the acceleration rate threshold of described setting is-6m/s
2.
Step 202: if not, determine and enter common brake downshift control mode.
Step 203: if determine and enter the standard downshift control mode that heavily touches on the brake.Here, the described standard not corresponding any control action of downshift control mode that heavily touches on the brake, it is only as a sign.
Step 204: whether judgement remains the described standard downshift control mode that heavily touches on the brake in the very first time section of setting.
Particularly, the very first time section of described setting is preferably 3 sampling periods, if according to each sampling period words that are 10ms, this step needs judgement, for 3 sampled datas in 30ms, for each sampled data integrating step 201 to the resulting result of step 203, be whether all to enter the standard downshift control mode that heavily touches on the brake.
Step 205: if determine and enter the described heavy downshift control mode that touches on the brake; If not, determine and enter described common brake downshift control mode.
First the method that the common brake downshift of described execution is controlled comprises the method for obtaining the gear that selector fork need to be switched to, and as shown in Figure 3, described obtaining method comprises the following steps:
Step 301: obtain the pre-hung speed of keeping off a car according to the described speed of a motor vehicle and car load acceleration.
Particularly, first judge whether described car load acceleration is greater than 0, if so, represent that car load is in acceleration mode, now, the described pre-hung speed of keeping off a car equals the skew speed of a motor vehicle that the described speed of a motor vehicle adds setting; If not, represent that car load is in deceleration regime, now, the described pre-hung speed of keeping off a car equals the skew speed of a motor vehicle that the described speed of a motor vehicle deducts described setting.Here, the skew speed of a motor vehicle of described setting is preferably 2km/h.
Step 302: obtain the actual pre-hung speed of keeping off a car according to keep off a car speed and described gain coefficient of described pre-hung.
Particularly, the described actual pre-hung speed of keeping off a car equals the product of the described speed of a motor vehicle and gain coefficient.
Step 303: according to described actual pre-hung keep off a car speed and described gas pedal aperture, table look-up acquisition described pre-hung gear.
Particularly, be similar to step 103, described pre-hung gear is also that the mode by tabling look-up is obtained, this table, i.e. and actual corresponding relation of putting into gear between the speed of a motor vehicle and gas pedal aperture and described pre-hung gear, also data are demarcated by experiment.
Step 304: according to described pre-hung gear and described first object gear, table look-up and obtain the second target gear that selector fork need to be switched to.
Particularly, described the second target gear is also that the mode by tabling look-up is obtained, this table, it is the corresponding relation between pre-hung gear and first object gear and described the second target gear, also data are demarcated by experiment, concrete calibration method is the method that those skilled in the art usually adopt, and therefore no longer repeats in this article.
What deserves to be explained is, because actual the put into gear speed of a motor vehicle and the pre-hung fast acquisition process of keeping off a car has all been considered the impact of brake, so adopt above-mentioned controlling method to guarantee that gear can lower fast, realized the output of power free of discontinuities.
After obtaining the second target gear that selector fork need to be switched to, the method that the common brake downshift of described execution is controlled also comprises:
First: send selector fork switching command, make to control selector fork and switch to described the second target gear.Here, it should be noted that, from gearbox control sends selector fork switching command, while being switched to described the second target gear to selector fork, the actuator's actuation time that at least needs 30ms, thereby in follow-up controlling method, also need further to judge whether described selector fork has been switched to described the second target gear.
Second: judge whether described the second target gear is odd number gear.
The 3rd: if, due to the corresponding first clutch of odd number gear, the corresponding second clutch of even number gear and reverse graft gear, therefore need to carry out second clutch to the switching of first clutch, and detailed controlling method will be described in detail in conjunction with Fig. 4 hereinafter.
The the 4th: if not, carry out first clutch to the switching of second clutch, detailed controlling method will be described in detail in conjunction with Fig. 5 hereinafter.
As shown in Figure 4, be when in the embodiment of the present invention, selector fork need to be switched to odd number gear, carry out the flow chart of the method for common brake downshift control, said method comprising the steps of:
Step 401: described first clutch is carried out to preacceleration inflation.
Particularly, by hydraulic control system, to first clutch, carry out pre-oiling, the hydraulic fluid chamber that can rapidly oil be charged into first clutch is inner, sets up oil pressure, thereby can make first clutch can meet rapidly the condition of transmitting torque, there is the feature fast that responds.
Step 402: when the pressure of described first clutch is more than or equal to the first pressure threshold of setting, and described selector fork is while being switched to described the second target gear, continues described first clutch to carry out pressurising.Here, the first pressure threshold of described setting is preferably 80kpa.
Step 403: until during the second pressure threshold that the pressure of described first clutch equals to set, reduce the oil-filled amount to second clutch, make the pressure decreased of described second clutch, and continue described first clutch to carry out pressurising.
Particularly, the second pressure threshold of described setting is preferably 250kpa, be binding site pressure (kiss-point point pressure), when the pressure of first clutch surpasses binding site pressure, further first clutch is carried out to pressurising on the one hand, increase the pressure of first clutch, suitably reduce on the other hand the oil-filled amount of second clutch, reduce the pressure of second clutch, by the task of transmitting torque, give first clutch gradually.
Step 404: until the moment of torsion of described first clutch transmission while being greater than the clean moment of torsion of motor, stops described second clutch to carry out pressurising.Now, can by first clutch, be completed the transmission of moment of torsion completely.
Step 405: the rotating speed of control engine, and make the rotating speed of the driven disc that the first object rotating speed of described motor is described first clutch.
Particularly, Once you begin by first clutch, bear the task that moment of torsion transmits, just need to intervene the rotating speed of motor, so that the rotating speed of motor as early as possible with the synchronization of the driven disc of first clutch, to reduce the sliding wear time of driving disc and the driven disc of first clutch, be conducive to avoid first clutch because the first clutch that sliding wear overlong time causes is overheated, extended the operating life of first clutch.
Here, the described method that the rotating speed of motor is intervened can adopt the usual PID closed loop control method adopting of those skilled in the art, the rotating speed of the driven disc that the first object rotating speed of the motor of setting in closed loop control method is first clutch can also be set the synchronization of motor in addition to described first object rotating speed lock in time used in described closed loop control method.Because above-mentioned closed loop control method is the usual methods that adopt of those skilled in the art, therefore no longer repeat in this article.
Step 406: in the time of in the margin of error that the rotating speed of described motor and the difference of described first object rotating speed are being set, the oil-filled amount of maintenance to described first clutch, make the pressure of described first clutch keep stable, stop the rotating speed of motor to control simultaneously.
Step 407: exit described common brake downshift control mode.
Correspondingly, method of the present invention also comprises when selector fork need to be switched to even number gear or reverse gear gear, carry out the method that common brake downshift is controlled, as shown in Figure 5, be when selector fork need to be switched to even number gear or reverse gear gear in the embodiment of the present invention, carry out the flow chart of the method for common brake downshift control, because the method shown in Fig. 5 is very similar to the method shown in Fig. 4, just the difference of control object, therefore only carries out brief description in conjunction with Fig. 5 below.
When described selector fork need to be switched to even number gear or reverse gear gear, the method for carrying out common brake downshift control comprises the following steps:
Step 501: described second clutch is carried out to preacceleration inflation;
Step 502: when the pressure of described second clutch is greater than the first pressure threshold of described setting, and described selector fork is while being switched to described the second target gear, continues described second clutch to carry out pressurising;
Step 503: until the pressure of described second clutch while equaling the second pressure threshold of described setting, reduces the oil-filled amount to first clutch, make the pressure decreased of described first clutch, and continue described second clutch to carry out pressurising;
Step 504: until the moment of torsion of described second clutch transmission while being greater than engine net torque, stops described first clutch to carry out pressurising;
Step 505: the rotating speed of control engine, and make the rotating speed of the driven disc that the second rotating speed of target of described motor is described second clutch;
Step 506: when the rotating speed of described motor and the difference of described the second rotating speed of target in the margin of error in described setting time, the oil-filled amount of maintenance to described second clutch, make the pressure of described second clutch keep stable, stop the rotating speed of motor to control simultaneously.
Step 507: exit described common brake downshift control mode.
As shown in Figure 6, be in the embodiment of the present invention, to carry out the flow chart that the downshift that heavily touches on the brake is controlled, the described execution method that downshift controls that heavily touches on the brake comprises the following steps:
Step 601: stop described first clutch and described second clutch to carry out pressurising.
Step 602: according to the described speed of a motor vehicle, car load acceleration, gain coefficient and gas pedal aperture, obtain pre-hung gear.
Particularly, due to the method for obtaining pre-hung gear with step 301 to the method described in step 303, so no longer repeat at this.
Step 603: table look-up and obtain the second target gear that selector fork need to be switched to according to described pre-hung gear and described first object gear.
Particularly, because the method for obtaining the second target gear is with the method described in step 304, so no longer repeat at this.
Step 604: send selector fork switching command, control selector fork and switch to described the second target gear.
Step 605: after the second time period of setting, exit the described heavy downshift control mode that touches on the brake.
Particularly, the second time period of described setting is preferably 3 sampling periods, and each sampling period is preferably 10ms; For this kind of set-up mode, after 30ms, exit the described heavy downshift control mode that touches on the brake, make the described heavy downshift control mode that touches on the brake keep 30ms backed off after random, then according to described the second target gear, select to bear the clutch of moment of torsion transmission tasks.
Adopt the method for carrying out the downshift control that heavily touches on the brake in the present embodiment, first allow first clutch and second clutch open, stop oil-filled to first clutch and second clutch, thereby avoided owing to heavily touching on the brake, cause car load load to increase suddenly, the rotating speed of motor sharply declines and even suppresses the generation of flame-out situation, has guaranteed driving comfortability and Security.
In addition, controlling method of the present invention is easy to realize, is easy to application, workable, data capture convenience, compare with the controlling method of domestic other wet-type double-clutch automatic speed-change casees, when this method has strengthened the driving comfortability of car load and Security, the operating life that has extended double clutch.
Embodiment shown in above foundation is graphic describes structure of the present invention, feature and action effect in detail; the foregoing is only preferred embodiment of the present invention; but the present invention does not limit practical range with shown in drawing; every change of doing according to conception of the present invention; or be revised as the equivalent embodiment of equivalent variations; when not exceeding yet specification and illustrating contain spiritual, all should be in protection scope of the present invention.
Claims (10)
1. a dual-clutch transmission brake downshift controlling method, is characterized in that, comprising:
Obtain brake pedal pressure, gas pedal aperture, the speed of a motor vehicle, car load acceleration and current gear;
According to described brake pedal pressure, obtain the percentaeg that brakes, and table look-up and obtain gain coefficient according to described brake percentaeg;
According to the described speed of a motor vehicle and described gain coefficient, obtain the actual speed of a motor vehicle of putting into gear;
According to the described actual speed of a motor vehicle and the described gas pedal aperture of putting into gear, table look-up and obtain first object gear;
Judge whether described first object gear is less than current gear, and whether described gas pedal aperture equals 0; If so,, according to described brake percentaeg and described car load acceleration, determine and 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, carry out common brake downshift and control;
If enter the downshift control mode that heavily touches on the brake, carry out the downshift that heavily touches on the brake and control.
2. method according to claim 1, is characterized in that, described according to described brake percentaeg and described car load acceleration, determines to enter common brake downshift control mode or enter the downshift control mode that heavily touches on the brake to comprise:
Judge whether described brake percentaeg is greater than the percentaeg threshold value of setting, and whether described car load acceleration is less than the acceleration rate threshold of setting;
If not, determine and enter common brake downshift control mode;
If so, determine and enter the standard downshift control mode that heavily touches on the brake;
Whether judgement remains the described standard downshift control mode that heavily touches on the brake in the very first time section of setting;
If so, determine and enter the described heavy downshift control mode that touches on the brake;
If not, determine and enter described common brake downshift control mode.
3. method according to claim 2, is characterized in that, the percentaeg threshold value of described setting is 5%, and the acceleration rate threshold of described setting is-6m/s
2; The very first time section of described setting is 3 sampling periods, and 1 sampling period is 10ms.
4. method according to claim 1, is characterized in that, the common brake downshift of described execution is controlled and comprised:
According to the described speed of a motor vehicle, car load acceleration, gain coefficient and gas pedal aperture, obtain pre-hung gear;
According to described pre-hung gear and described first object gear, table look-up and obtain the second target gear that selector fork need to be switched to;
Send selector fork switching command, control selector fork and switch to described the second target gear;
Judge whether described the second target gear is odd number gear;
If, described first clutch is carried out to preacceleration inflation, and the pressure of working as described first clutch is more than or equal to the first pressure threshold of setting, and when described selector fork has been switched to described the second target gear, continuation is carried out pressurising to described first clutch, until during the second pressure threshold that the pressure of described first clutch equals to set, the oil-filled amount of minimizing to second clutch, make the pressure decreased of described second clutch, and continue described first clutch to carry out pressurising, until the moment of torsion of described first clutch transmission is while being greater than the clean moment of torsion of motor, stop described second clutch to carry out pressurising,
The rotating speed of control engine, and make the rotating speed of the driven disc that the first object rotating speed of described motor is described first clutch;
In the time of in the margin of error that the rotating speed of described motor and the difference of described first object rotating speed are being set, the oil-filled amount of maintenance to described first clutch, make the pressure of described first clutch keep stable, stop the rotating speed of motor to control simultaneously, and exit described common brake downshift control mode.
5. method according to claim 4, is characterized in that, the common brake downshift of described execution is controlled and also comprised:
If described the second target gear is even number gear or the gear that reverses gear, described second clutch is carried out to preacceleration inflation, and the pressure of working as described second clutch is greater than the first pressure threshold of described setting, and when described selector fork has been switched to described the second target gear, continuation is carried out pressurising to described second clutch, until the pressure of described second clutch is while equaling the second pressure threshold of described setting, the oil-filled amount of minimizing to first clutch, make the pressure decreased of described first clutch, and continue described second clutch to carry out pressurising, until the moment of torsion of described second clutch transmission is while being greater than engine net torque, stop described first clutch to carry out pressurising,
The rotating speed of control engine, and make the rotating speed of the driven disc that the second rotating speed of target of described motor is described second clutch;
When the rotating speed of described motor and the difference of described the second rotating speed of target in the margin of error in described setting time, the oil-filled amount of maintenance to described second clutch, make the pressure of described second clutch keep stable, stop the rotating speed of motor to control simultaneously, and exit described common brake downshift control mode.
6. according to the method described in claim 4 or 5, it is characterized in that, described according to the described speed of a motor vehicle, car load acceleration, gain coefficient and gas pedal aperture, obtain pre-hung gear and comprise:
According to the described speed of a motor vehicle and car load acceleration, obtain the pre-hung speed of keeping off a car;
According to keep off a car speed and described gain coefficient of described pre-hung, obtain the actual pre-hung speed of keeping off a car;
According to described actual pre-hung keep off a car speed and described gas pedal aperture, table look-up acquisition described pre-hung gear.
7. according to the method described in claim 4 or 5, it is characterized in that, the first pressure threshold of described setting is 80kpa; The second pressure threshold of described setting is 250kpa.
8. method according to claim 1, is characterized in that, the described execution downshift that heavily touches on the brake is controlled and to be comprised:
Stop described first clutch and described second clutch to carry out pressurising;
According to the described speed of a motor vehicle, car load acceleration, gain coefficient and gas pedal aperture, obtain pre-hung gear, and table look-up and obtain the second target gear that selector fork need to be switched to according to described pre-hung gear and described first object gear;
Send selector fork switching command, control selector fork and switch to described the second target gear;
After the second time period of setting, exit the described heavy downshift control mode that touches on the brake.
9. method according to claim 8, is characterized in that, described according to the described speed of a motor vehicle, car load acceleration, gain coefficient and gas pedal aperture, obtains pre-hung gear and comprises:
According to the described speed of a motor vehicle and car load acceleration, obtain the pre-hung speed of keeping off a car;
According to keep off a car speed and described gain coefficient of described pre-hung, obtain the actual pre-hung speed of keeping off a car;
According to described actual pre-hung keep off a car speed and described gas pedal aperture, table look-up acquisition described pre-hung gear.
10. method according to claim 8, is characterized in that, the second time period of described setting is 3 sampling periods.
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| CN201410038453.3A CN103758995B (en) | 2014-01-26 | 2014-01-26 | Dual-clutch transmission brake downshift controlling method |
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| CN201410038453.3A CN103758995B (en) | 2014-01-26 | 2014-01-26 | Dual-clutch transmission brake downshift controlling method |
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| CN104455377A (en) * | 2014-12-09 | 2015-03-25 | 安徽江淮汽车股份有限公司 | Shifting fork position learning method and system |
| CN104976243A (en) * | 2015-07-17 | 2015-10-14 | 上海汽车变速器有限公司 | Precharge oil pressure self-adaption method and system for wet type double clutch automatic gearbox |
| CN105179676A (en) * | 2015-08-11 | 2015-12-23 | 上海汽车变速器有限公司 | Braking downshifting control method for automatic six-speed wet type double-clutch transmission |
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