CN103758995B - Dual-clutch transmission brake downshift controlling method - Google Patents

Dual-clutch transmission brake downshift controlling method Download PDF

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Publication number
CN103758995B
CN103758995B CN201410038453.3A CN201410038453A CN103758995B CN 103758995 B CN103758995 B CN 103758995B CN 201410038453 A CN201410038453 A CN 201410038453A CN 103758995 B CN103758995 B CN 103758995B
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China
Prior art keywords
gear
speed
clutch
brake
motor vehicle
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CN201410038453.3A
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CN103758995A (en
Inventor
严刚
徐瑞雪
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Anhui Jianghuai Automobile Group Corp
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Anhui Jianghuai Automobile Group Corp
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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
    • 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
    • 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
    • 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
    • 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
    • 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
    • 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
    • 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
    • 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

Abstract

The invention discloses 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 shift; Obtain according to brake pedal pressure the percentaeg that brakes, the relation table searching brake percentaeg and speed of a motor vehicle gain coefficient 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, search the actual speed of a motor vehicle and the mapping table between gas pedal aperture and first object gear of putting into gear and obtain first object gear; When first object gear is less than current shift, and gas pedal aperture equals 0, then according to brake percentaeg and car load acceleration, judge enter common brake downshift control mode or enter the downshift control mode that heavily touches on the brake; Corresponding brake downshift control mode is performed according to judged result.Adopt the present invention to ensure that gear can lower fast, improve driving comfortability and Security.

Description

Dual-clutch transmission brake downshift controlling method
Technical field
The present invention relates to automotive transmission technical field, particularly relate 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, controls odd number gear, and outer clutch is also called first clutch; Internal clutch is connected with interior input shaft, and control even number gear and the gear that reverses gear (namely R keeps off gear), internal clutch is also called second clutch.Utilize electrichydraulic control, drive solenoid valve to realize the alternation of gear change and clutch, final realization gearshift automation.
The unspecial function of the downshift process under brake intervention being carried out to Systematical control of current wet-type double-clutch automatic speed-change case, owing to not considering the impact of braking, so make gear not lower rapidly, probably cause in the process of brake downshift, occur that car load travels irregularity, the sliding wear overlong time of clutch causes the phenomenon of clutch overheat, reduce the Security of car load, the travelling comfort driven and the operating life of clutch, especially in the process heavily touched on the brake, car load load is likely caused to increase suddenly, engine speed sharply declines, even there is the generation of suppressing misfiring condition, reduce further the Security of car load and the travelling comfort of driving.
Summary of the invention
The object of the invention is to overcome deficiency of the prior art, provide a kind of dual-clutch transmission brake downshift controlling method.
For achieving the above object, technological scheme of the present invention is:
A kind of 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;
Obtain according to described brake pedal pressure the percentaeg that brakes, and search for representing that the table of the relation between brake percentaeg and speed of a motor vehicle gain coefficient obtains speed of a motor vehicle gain coefficient according to described brake percentaeg;
According to the described speed of a motor vehicle and described speed of a motor vehicle 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, search for representing that actual table of putting into gear the speed of a motor vehicle and the corresponding relation between gas pedal aperture and first object gear obtains first object gear;
Judge whether described first object gear is less than current gear, and whether described gas pedal aperture equals 0; If so, then according to described brake percentaeg and described 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.
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, then determine to enter common brake downshift control mode;
If so, then determine to enter standard heavily to touch on the brake downshift control mode;
Judge in the first time period of setting, whether remain that described standard heavily touches on the brake downshift control mode;
If so, then determine to enter the described heavy downshift control mode that touches on the brake;
If not, then determine to enter described common brake downshift control mode.
Preferably, the percentaeg threshold value of described setting is 5%, and the described acceleration rate threshold set is as-6m/s 2; The first time period of described setting is 3 sampling periods, and 1 sampling period is 10ms.
Preferably, the common brake downshift of described execution controls to comprise:
According to the described speed of a motor vehicle, car load acceleration, speed of a motor vehicle gain coefficient and gas pedal aperture, obtain pre-hung gear;
According to described pre-hung gear and described first object gear, the table searched for representing pre-hung gear and the corresponding relation between first object gear and the second target gear obtains the second target gear that selector fork needs are switched to;
Send selector fork switching command, control selector fork and switch to described second target gear;
Judge whether described second target gear is odd number gear;
If, then preacceleration inflation is carried out to described first clutch, and the pressure of working as described first clutch is more than or equal to the first pressure threshold of setting, and described selector fork is when being switched to described second target gear, continue to carry out pressurising to described first clutch, until when the pressure of described first clutch equals the second pressure threshold set, reduce the oil-filled amount to second clutch, the pressure of described second clutch is reduced, and continue to carry out pressurising to described first clutch, until when the moment of torsion of described first clutch transmission is greater than the clean moment of torsion of motor, stop carrying out pressurising to described second clutch,
Control the rotating speed of motor, and make the first object rotating speed of described motor be the rotating speed of the driven disc of described first clutch;
When the rotating speed of described motor and the difference of described first object rotating speed are in the margin of error set, keep the oil-filled amount to described first clutch, make the pressure remained steady of described first clutch, stop controlling the rotating speed of motor simultaneously, and exit described common brake downshift control mode.
Preferably, the common brake downshift of described execution controls also to comprise:
If described second target gear is even number gear or the gear that reverses gear, then preacceleration inflation is carried out to described second clutch, and the pressure of working as described second clutch is greater than the first pressure threshold of described setting, and described selector fork is when being switched to described second target gear, continue to carry out pressurising to described second clutch, until when the pressure of described second clutch equals the second pressure threshold of described setting, reduce the oil-filled amount to first clutch, the pressure of described first clutch is reduced, and continue to carry out pressurising to described second clutch, until when the moment of torsion of described second clutch transmission is greater than engine net torque, stop carrying out pressurising to described first clutch,
Control the rotating speed of motor, and make the second rotating speed of target of described motor be the rotating speed of the driven disc of described second clutch;
When the rotating speed of described motor and the difference of described second rotating speed of target are in the margin of error of described setting, keep the oil-filled amount to described second clutch, make the pressure remained steady of described second clutch, stop controlling the rotating speed of motor simultaneously, and exit described common brake downshift control mode.
Preferably, described according to the described speed of a motor vehicle, car load acceleration, speed of a motor vehicle gain coefficient and gas pedal aperture, obtain pre-hung gear and comprise:
Obtain pre-hung according to the described speed of a motor vehicle and car load acceleration to keep off a car speed;
Obtain actual pre-hung to keep off a car speed according to keep off a car speed and described speed of a motor vehicle gain coefficient of described pre-hung;
According to described actual pre-hung keep off a car speed and described gas pedal aperture, search for representing that actual table of putting into gear the speed of a motor vehicle and the corresponding relation between gas pedal aperture and described pre-hung gear obtains described pre-hung gear.
Preferably, the first pressure threshold of described setting is 80kpa; Second pressure threshold of described setting is 250kpa.
Preferably, described execution heavily touch on the brake downshift control comprise:
Stop carrying out pressurising to first clutch and second clutch;
According to the described speed of a motor vehicle, car load acceleration, speed of a motor vehicle gain coefficient and gas pedal aperture, obtain pre-hung gear, and obtain according to described pre-hung gear and the described first object gear table searched for representing pre-hung gear and the corresponding relation between first object gear and the second target gear the second target gear that selector fork needs are switched to;
Send selector fork switching command, control selector fork and switch to described 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, speed of a motor vehicle gain coefficient and gas pedal aperture, obtain pre-hung gear and comprise:
Obtain pre-hung according to the described speed of a motor vehicle and car load acceleration to keep off a car speed;
Obtain actual pre-hung to keep off a car speed according to keep off a car speed and described speed of a motor vehicle gain coefficient of described pre-hung;
According to described actual pre-hung keep off a car speed and described gas pedal aperture, search for representing that actual table of putting into gear the speed of a motor vehicle and the corresponding relation between gas pedal aperture and described pre-hung gear obtains 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, considers the impact of brake, can ensure that gear can lower fast, achieve power free of discontinuities and export and drive smoothness; In addition, described controlling method has carried out effective differentiation to common brake downshift and the downshift that heavily touches on the brake: for common brake downshift control mode, is conducive to avoiding clutch to cause clutch overheat due to sliding wear overlong time, extends the operating life of clutch; For the control mode that heavily touches on the brake, avoid owing to heavily touching on the brake, cause car load load to increase suddenly, engine speed sharply declines and even suppresses the generation of misfiring condition, ensure that 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 to show in the embodiment of the present invention according to described brake percentaeg and described car load acceleration, determines the flow chart entering common brake downshift control mode or enter the downshift control mode that heavily touches on the brake:
Fig. 3 shows the flow chart obtaining selector fork and need the method for the gear be switched to;
Fig. 4 shows selector fork in the embodiment of the present invention when needing to be switched to odd number gear, performs the flow chart of the method that common brake downshift controls;
Fig. 5 show selector fork in the embodiment of the present invention need to be switched to even number gear or reverse gear gear time, perform the flow chart of the method that common brake downshift controls;
Fig. 6 shows in the embodiment of the present invention flow chart performing the method that the downshift that heavily touches on the brake controls.
Embodiment
Be described below in detail embodiments of the invention, the example of described embodiment is shown in the drawings, and wherein same or similar label represents same or similar element or has element that is identical or similar functions from start to finish.Being exemplary below by the embodiment be described with reference to the drawings, only for explaining the present invention, and can not limitation of the present invention being interpreted as.
Dual-clutch transmission brake downshift controlling method of the present invention, considers the impact of brake, can ensure that gear can lower fast, achieve power free of discontinuities and export and drive smoothness; In addition, described controlling method has carried out effective differentiation to common brake downshift and the downshift that heavily touches on the brake: for common brake downshift control mode, employ control of engine speed, control of engine speed shortens the lock in time of clutch driving plate rotating speed and driven disc rotating speed, be conducive to avoiding clutch to cause clutch overheat due to sliding wear overlong time, extend the operating life of clutch; For the control mode that heavily touches on the brake, stop respectively carrying out oil-filled to first clutch and second clutch, thus make first clutch and second clutch all cannot transmitting torque, avoid owing to heavily touching on the brake, car load load is caused to increase suddenly, engine speed sharply declines and even suppresses the generation of misfiring condition, ensure that 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 obtains by the pressure transducer be arranged on braking pedal, and gas pedal aperture obtains by the position transducer being arranged on gas pedal place, and the speed of a motor vehicle is obtained by vehicle speed sensor, car load acceleration by 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 by obtaining for the position transducer detecting shift lever position.Obtain manner due to each parameter above-mentioned is content well-known to those skilled in the art, so no longer carry out expansion explanation at this.
Step 102: obtain according to described brake pedal pressure the percentaeg that brakes, and table look-up according to described brake percentaeg and obtain gain coefficient.
Particularly, brake percentaeg by calculate, wherein F represents current brake pedal pressure, F maxand F minrepresent pressure maximum and the pressure minimum of braking pedal respectively, described pressure maximum and pressure minimum are the intrinsic parameter of braking pedal, here by gathering the speed of a motor vehicle, brake pedal pressure, calculate brake percentaeg, there are data be convenient to gather, workable advantage.
In addition, utilize brake percentaeg can obtain gain coefficient by the mode of tabling look-up, described table, namely the corresponding relation braked between percentaeg and gain coefficient can data be demarcated by experiment.
Step 103: according to the described speed of a motor vehicle and described gain coefficient, obtains 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, tables 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 obtains, and this table, namely the actual speed of a motor vehicle and the corresponding relation between gas pedal aperture and described first object gear of putting into gear, also can data demarcate 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 entering the control of brake downshift, has application strong, is easy to the advantage realized.
Step 105: if then according to described brake percentaeg and described car load acceleration, determine 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 equals 0, then mean 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, determine that car load enters common brake downshift control mode or enters the downshift control mode that heavily touches on the brake further, enter about how to judge the method that common brake downshift control mode still enters the downshift control mode that heavily touches on the brake, will be described in detail by composition graphs 2 hereinafter.
Step 106: if enter common brake downshift control mode, then perform common brake downshift and control.The method that the common brake downshift of described execution controls will composition graphs 4 and Fig. 5 be described in detail hereinafter.
Step 107: if enter the downshift control mode that heavily touches on the brake, then perform the downshift that heavily touches on the brake and control.Described execution heavily touch on the brake downshift control method will hereinafter composition graphs 6 be described in detail.
As shown in Figure 2, according to described brake percentaeg and described car load acceleration in the embodiment of the present invention, determine the flow chart entering common brake downshift control mode or enter the downshift control mode that heavily touches on the brake, describedly determine to enter common brake downshift control mode or enter the downshift control mode that heavily touches on the brake to 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 described acceleration rate threshold set is as-6m/s 2.
Step 202: if not, then determine to enter common brake downshift control mode.
Step 203: if then determine to enter standard and heavily to touch on the brake downshift control mode.Here, described standard heavily touches on the brake the not corresponding any control action of downshift control mode, and it is only as a mark.
Step 204: judge whether remain that in the first time period of setting described standard heavily touches on the brake downshift control mode.
Particularly, the first time period of described setting is preferably 3 sampling periods, if be the words of 10ms according to each sampling period, then this step needs to judge, for time sampled data of 3 in 30ms, the result whether obtained for each sampled data integrating step 201 to step 203 is all enter standard heavily to touch on the brake downshift control mode.
Step 205: if then determine to enter the described heavy downshift control mode that touches on the brake; If not, then determine to enter described common brake downshift control mode.
First the method that the common brake downshift of described execution controls comprises the method obtaining the gear that selector fork needs are switched to, and as shown in Figure 3, described obtaining method comprises the following steps:
Step 301: obtain pre-hung according to the described speed of a motor vehicle and car load acceleration and to keep off a car speed.
Particularly, first judge whether described car load acceleration is greater than 0, if so, then represent that car load is in acceleration mode, now, 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, then represent that car load is in deceleration regime, now, 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 actual pre-hung to keep off a car speed according to keep off a car speed and described gain coefficient of described pre-hung.
Particularly, 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 obtains, and this table, namely the actual speed of a motor vehicle and the corresponding relation between gas pedal aperture and described pre-hung gear of putting into gear, also can data demarcate by experiment.
Step 304: according to described pre-hung gear and described first object gear, the second target gear that acquisition selector fork of tabling look-up needs to be switched to.
Particularly, described second target gear is also that the mode by tabling look-up obtains, this table, i.e. pre-hung gear and the corresponding relation between first object gear and described second target gear, also can data demarcate 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 the keep off a car acquisition process of speed of actual the put into gear speed of a motor vehicle and pre-hung all considers the impact of brake, so adopt above-mentioned controlling method ensure that, gear can lower fast, achieves power free of discontinuities and exports.
After acquisition selector fork needs the second target gear be switched to, the method that the common brake downshift of described execution controls also comprises:
First: send selector fork switching command, control selector fork is switched to described second target gear.Here, it should be noted that, from gearbox control sends selector fork switching command, when being switched to described second target gear to selector fork, at least need actuator's actuation time of 30ms, thus in follow-up controlling method, also need to judge whether described selector fork has been switched to described second target gear further.
Second: judge whether described second target gear is odd number gear.
3rd: if, due to the corresponding first clutch of odd number gear, even number gear and the corresponding second clutch of reverse graft gear, therefore need to carry out the switching of second clutch to first clutch, and detailed controlling method will be described in detail by composition graphs 4 hereinafter.
4th: if not, then carry out the switching of first clutch to second clutch, detailed controlling method will be described in detail by composition graphs 5 hereinafter.
As shown in Figure 4, be when selector fork needs to be switched to odd number gear in the embodiment of the present invention, perform the flow chart of the method that common brake downshift controls, said method comprising the steps of:
Step 401: preacceleration inflation is carried out to described first clutch.
Particularly, carry out pre-oiling by hydraulic control system to first clutch, the hydraulic fluid chamber that rapidly oil can be charged into first clutch is inner, sets up oil pressure, thus first clutch can be enable to meet the condition of transmitting torque rapidly, have and respond feature fast.
Step 402: when the pressure of 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 second target gear, continue to carry out pressurising to described first clutch.Here, the first pressure threshold of described setting is preferably 80kpa.
Step 403: until when the pressure of described first clutch equals the second pressure threshold set, reduce the oil-filled amount to second clutch, make the pressure of described second clutch reduce, and continue to carry out pressurising to described first clutch.
Particularly, second pressure threshold of described setting is preferably 250kpa, i.e. binding site pressure (kiss-point point pressure), when the pressure of first clutch exceedes binding site pressure, further pressurising is carried out to first clutch on the one hand, increase the pressure of first clutch, suitably reduce the oil-filled amount of second clutch on the other hand, reduce the pressure of second clutch, give first clutch by the task of transmitting torque gradually.
Step 404: until when the moment of torsion of described first clutch transmission is greater than the clean moment of torsion of motor, stops carrying out pressurising to described second clutch.Now, the transmission of moment of torsion can be completed completely by first clutch.
Step 405: control the rotating speed of motor, and make the first object rotating speed of described motor be the rotating speed of the driven disc of described first clutch.
Particularly, once the task of being born moment of torsion transmission by first clutch, with regard to needing, the rotating speed of motor is intervened, with the rotating speed making motor as early as possible with the synchronization of the driven disc of first clutch, with the sliding wear time of the driving disc and driven disc that reduce first clutch, the first clutch being conducive to avoiding first clutch to cause due to sliding wear overlong time is overheated, extends the operating life of first clutch.
Here, the PID closed loop control method that described method of intervening the rotating speed of motor can adopt those skilled in the art usually to adopt, the first object rotating speed of the motor set in closed loop control method is the rotating speed of the driven disc of first clutch, can also 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 method that those skilled in the art usually adopt, therefore no longer repeat in this article.
Step 406: when the rotating speed of described motor and the difference of described first object rotating speed are in the margin of error set, keep the oil-filled amount to described first clutch, make the pressure remained steady of described first clutch, stop controlling the rotating speed of motor simultaneously.
Step 407: exit described common brake downshift control mode.
Correspondingly, method of the present invention also comprise selector fork need to be switched to even number gear or reverse gear gear time, perform the method that common brake downshift controls, as shown in Figure 5, be in the embodiment of the present invention selector fork need to be switched to even number gear or reverse gear gear time, perform the flow chart of the method that common brake downshift controls, because the method shown in Fig. 5 is very similar to the method shown in Fig. 4, the just difference of control object, therefore only composition graphs 5 carries out brief description below.
Described selector fork need to be switched to even number gear or reverse gear gear time, perform the method that common brake downshift controls and comprise the following steps:
Step 501: preacceleration inflation is carried out to described second clutch;
Step 502: when the pressure of described second clutch is greater than the first pressure threshold of described setting, and when described selector fork has been switched to described second target gear, continue to carry out pressurising to described second clutch;
Step 503: until when the pressure of described second clutch equals the second pressure threshold of described setting, reduces the oil-filled amount to first clutch, and the pressure of described first clutch is reduced, and continues to carry out pressurising to described second clutch;
Step 504: until when the moment of torsion of described second clutch transmission is greater than engine net torque, stops carrying out pressurising to described first clutch;
Step 505: control the rotating speed of motor, and make the second rotating speed of target of described motor be the rotating speed of the driven disc of described second clutch;
Step 506: when the rotating speed of described motor and the difference of described second rotating speed of target are in the margin of error of described setting, keep the oil-filled amount to described second clutch, make the pressure remained steady of described second clutch, stop controlling the rotating speed of motor simultaneously.
Step 507: exit described common brake downshift control mode.
As shown in Figure 6, be perform in the embodiment of the present invention heavily touch on the brake downshift control flow chart, described execution heavily touch on the brake downshift control method comprise the following steps:
Step 601: stop carrying out pressurising to described first clutch and described second clutch.
Step 602: according to the described speed of a motor vehicle, car load acceleration, gain coefficient and gas pedal aperture, obtains pre-hung gear.
Particularly, owing to obtaining the method for pre-hung gear with the method described in step 301 to step 303, so no longer repeat at this.
Step 603: table look-up according to described pre-hung gear and described first object gear and obtain selector fork and need the second target gear of being switched to.
Particularly, owing to obtaining the method for the second target gear with the method described in step 304, so no longer repeat at this.
Step 604: send selector fork switching command, controls selector fork and switches to described second target gear.
Step 605: after the second time period of setting, exits 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, namely make the described heavy downshift control mode that touches on the brake keep 30ms backed off after random, then select to need the clutch bearing moment of torsion transmission tasks according to described second target gear.
Adopt in the present embodiment the method performing the downshift that heavily touches on the brake and control, first first clutch and second clutch is allowed to open, what namely stop first clutch and second clutch is oil-filled, thus avoid owing to heavily touching on the brake, car load load is caused to increase suddenly, the rotating speed of motor sharply declines and even suppresses the generation of misfiring condition, ensure that driving comfortability and Security.
In addition, controlling method of the present invention is easy to realize, be easy to application, workable, data capture convenience, compare with the controlling method of other wet-type double-clutch automatic speed-change casees domestic, while the driving comfortability that this method enhances car load and Security, extend the operating life of double clutch.
Structure of the present invention, feature and action effect is described in detail above according to graphic shown embodiment; 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 done according to conception of the present invention; or be revised as the Equivalent embodiments of equivalent variations; do not exceed yet specification with diagram contain spiritual time, all should 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;
Obtain according to described brake pedal pressure the percentaeg that brakes, and search for representing that the table of the relation between brake percentaeg and speed of a motor vehicle gain coefficient obtains speed of a motor vehicle gain coefficient according to described brake percentaeg;
According to the described speed of a motor vehicle and described speed of a motor vehicle 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, search for representing that actual table of putting into gear the speed of a motor vehicle and the corresponding relation between gas pedal aperture and first object gear obtains first object gear;
Judge whether described first object gear is less than current gear, and whether described gas pedal aperture equals 0; If so, then according to described brake percentaeg and described 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.
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, then determine to enter common brake downshift control mode;
If so, then determine to enter standard heavily to touch on the brake downshift control mode;
Judge in the first time period of setting, whether remain that described standard heavily touches on the brake downshift control mode;
If so, then determine to enter the described heavy downshift control mode that touches on the brake;
If not, then determine to 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 described acceleration rate threshold set is as-6m/s 2; The first time period 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 controls to comprise:
According to the described speed of a motor vehicle, car load acceleration, speed of a motor vehicle gain coefficient and gas pedal aperture, obtain pre-hung gear;
According to described pre-hung gear and described first object gear, the table searched for representing pre-hung gear and the corresponding relation between first object gear and the second target gear obtains the second target gear that selector fork needs are switched to;
Send selector fork switching command, control selector fork and switch to described second target gear;
Judge whether described second target gear is odd number gear;
If, then preacceleration inflation is carried out to first clutch, and the pressure of working as described first clutch is more than or equal to the first pressure threshold of setting, and described selector fork is when being switched to described second target gear, continue to carry out pressurising to described first clutch, until when the pressure of described first clutch equals the second pressure threshold set, reduce the oil-filled amount to second clutch, the pressure of described second clutch is reduced, and continue to carry out pressurising to described first clutch, until when the moment of torsion of described first clutch transmission is greater than the clean moment of torsion of motor, stop carrying out pressurising to described second clutch,
Control the rotating speed of motor, and make the first object rotating speed of described motor be the rotating speed of the driven disc of described first clutch;
When the rotating speed of described motor and the difference of described first object rotating speed are in the margin of error set, keep the oil-filled amount to described first clutch, make the pressure remained steady of described first clutch, stop controlling the rotating speed of motor 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 controls also to comprise:
If described second target gear is even number gear or the gear that reverses gear, then preacceleration inflation is carried out to described second clutch, and the pressure of working as described second clutch is greater than the first pressure threshold of described setting, and described selector fork is when being switched to described second target gear, continue to carry out pressurising to described second clutch, until when the pressure of described second clutch equals the second pressure threshold of described setting, reduce the oil-filled amount to first clutch, the pressure of described first clutch is reduced, and continue to carry out pressurising to described second clutch, until when the moment of torsion of described second clutch transmission is greater than engine net torque, stop carrying out pressurising to described first clutch,
Control the rotating speed of motor, and make the second rotating speed of target of described motor be the rotating speed of the driven disc of described second clutch;
When the rotating speed of described motor and the difference of described second rotating speed of target are in the margin of error of described setting, keep the oil-filled amount to described second clutch, make the pressure remained steady of described second clutch, stop controlling the rotating speed of motor simultaneously, and exit described common brake downshift control mode.
6. the method according to claim 4 or 5, is characterized in that, described according to the described speed of a motor vehicle, car load acceleration, speed of a motor vehicle gain coefficient and gas pedal aperture, obtains pre-hung gear and comprises:
Obtain pre-hung according to the described speed of a motor vehicle and car load acceleration to keep off a car speed;
Obtain actual pre-hung to keep off a car speed according to keep off a car speed and described speed of a motor vehicle gain coefficient of described pre-hung;
According to described actual pre-hung keep off a car speed and described gas pedal aperture, search for representing that actual table of putting into gear the speed of a motor vehicle and the corresponding relation between gas pedal aperture and described pre-hung gear obtains described pre-hung gear.
7. the method according to claim 4 or 5, is characterized in that, the first pressure threshold of described setting is 80kpa; Second pressure threshold of described setting is 250kpa.
8. method according to claim 1, is characterized in that, described execution heavily touch on the brake downshift control comprise:
Stop carrying out pressurising to first clutch and second clutch;
According to the described speed of a motor vehicle, car load acceleration, speed of a motor vehicle gain coefficient and gas pedal aperture, obtain pre-hung gear, and obtain according to described pre-hung gear and the described first object gear table searched for representing pre-hung gear and the corresponding relation between first object gear and the second target gear the second target gear that selector fork needs are switched to;
Send selector fork switching command, control selector fork and switch to described 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, speed of a motor vehicle gain coefficient and gas pedal aperture, obtains pre-hung gear and comprises:
Obtain pre-hung according to the described speed of a motor vehicle and car load acceleration to keep off a car speed;
Obtain actual pre-hung to keep off a car speed according to keep off a car speed and described speed of a motor vehicle gain coefficient of described pre-hung;
According to described actual pre-hung keep off a car speed and described gas pedal aperture, search for representing that actual table of putting into gear the speed of a motor vehicle and the corresponding relation between gas pedal aperture and described pre-hung gear obtains 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.
CN201410038453.3A 2014-01-26 2014-01-26 Dual-clutch transmission brake downshift controlling method Active CN103758995B (en)

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Families Citing this family (19)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US9242651B1 (en) * 2014-08-19 2016-01-26 GM Global Technology Operations LLC Power-on downshift control of a dual-clutch transmission
CN104455377B (en) * 2014-12-09 2016-08-24 安徽江淮汽车股份有限公司 A kind of selector fork position learning method and system
GB2535521B (en) 2015-02-20 2017-09-13 Ford Global Tech Llc A method of controlling the stopping and starting of an engine
CN104976243B (en) * 2015-07-17 2017-03-29 上海汽车变速器有限公司 The pre-oiling pressure adaptive method and system of wet dual-clutch automatic transmission
CN105179676B (en) * 2015-08-11 2017-11-17 上海汽车变速器有限公司 The downshift control method that touches on the brake of six fast wet type double-clutch automatic gearboxes
DE102015215445A1 (en) 2015-08-13 2017-02-16 Bayerische Motoren Werke Aktiengesellschaft Control method and control device in a motor vehicle for switching an automatic transmission
CN107208788A (en) * 2016-01-13 2017-09-26 爱信Ai株式会社 The control device of automobile-used pair of disengaging type speed changer
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
CN107763201B (en) * 2016-08-19 2019-12-24 上海汽车集团股份有限公司 Gear shifting control method and control device of double-clutch transmission under sliding downshift working condition
CN109424738B (en) * 2017-09-05 2020-10-02 上海汽车集团股份有限公司 Shifting fork control method and device during downshift of double-clutch gearbox
CN107542914A (en) * 2017-10-17 2018-01-05 安徽江淮汽车集团股份有限公司 A kind of wet dual-clutch automatic transmission is stepped on the gas the control method of downshift
CN108223775B (en) * 2018-01-05 2020-10-02 重庆青山工业有限责任公司 Vehicle emergency braking flameout prevention control system and functional module framework
CN109896471B (en) * 2019-04-04 2020-09-01 杭叉集团股份有限公司 Automatic gear shifting method and system
CN110159750B (en) * 2019-05-09 2020-08-21 中国第一汽车股份有限公司 Power downshift rotating speed adjusting and controlling method for double-clutch automatic transmission
CN113135176B (en) * 2020-07-06 2022-05-31 长城汽车股份有限公司 Mode switching control method and device of hybrid vehicle and vehicle
CN112460252B (en) * 2020-11-20 2022-07-19 浙江吉利控股集团有限公司 Intelligent gear shifting method and device based on double clutches
CN114370499B (en) * 2022-01-28 2023-05-09 奇瑞商用车（安徽）有限公司 Automatic gearbox vehicle type downshift control method
CN114962622B (en) * 2022-04-25 2023-06-09 安徽江淮汽车集团股份有限公司 Gear shifting control method and device for 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

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP3508313B2 (en) * 1995-07-25 2004-03-22 マツダ株式会社 Control device for automatic transmission
CN101153654A (en) * 2007-09-19 2008-04-02 同济大学 Dual-clutch automatic speed transmission synchronizer and self-adapting control method for gear switch
JP2010143361A (en) * 2008-12-18 2010-07-01 Nissan Motor Co Ltd Regenerative braking time gear shift control device for automatic transmission for electric vehicle
CN102537312B (en) * 2011-12-31 2015-04-01 重庆长安汽车股份有限公司 Method for controlling automatic transmission to downshift after braking
US8744705B2 (en) * 2012-03-15 2014-06-03 GM Global Technology Operations LLC System and method for determining clutch gains in a transmission during a power downshift

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