CN104089003B - A kind of double-clutch automatic gearbox limp-home controlling method - Google Patents
A kind of double-clutch automatic gearbox limp-home controlling method Download PDFInfo
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- CN104089003B CN104089003B CN201410290664.6A CN201410290664A CN104089003B CN 104089003 B CN104089003 B CN 104089003B CN 201410290664 A CN201410290664 A CN 201410290664A CN 104089003 B CN104089003 B CN 104089003B
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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
- F16H61/12—Detecting malfunction or potential malfunction, e.g. fail safe; Circumventing or fixing failures
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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
- F16H63/00—Control outputs from the control unit to change-speed- or reversing-gearings for conveying rotary motion or to other devices than the final output mechanism
- F16H63/40—Control outputs from the control unit to change-speed- or reversing-gearings for conveying rotary motion or to other devices than the final output mechanism comprising signals other than signals for actuating the final output mechanisms
- F16H63/42—Ratio indicator devices
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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
- F16H61/12—Detecting malfunction or potential malfunction, e.g. fail safe; Circumventing or fixing failures
- F16H2061/1208—Detecting malfunction or potential malfunction, e.g. fail safe; Circumventing or fixing failures with diagnostic check cycles; Monitoring of failures
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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
- F16H61/12—Detecting malfunction or potential malfunction, e.g. fail safe; Circumventing or fixing failures
- F16H2061/1224—Adapting to failures or work around with other constraints, e.g. circumvention by avoiding use of failed parts
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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
- F16H61/12—Detecting malfunction or potential malfunction, e.g. fail safe; Circumventing or fixing failures
- F16H2061/1244—Keeping the current state
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- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Control Of Transmission Device (AREA)
Abstract
The invention provides a kind of double-clutch automatic gearbox limp-home controlling method, comprising: gather vehicle speed signal, clutch input speed signal, interior input shaft tach signal, outer input shaft tach signal, output shaft tach signal, selector fork position signal; When described interior input shaft tach signal, outer input shaft tach signal are all lost, whether the speed ratio verification current shift according to described vehicle speed signal, described clutch input speed signal and current shift mates; If current shift is mated, keep current shift to travel, if current shift is not mated, carry out the switching of odd even gear.Keep normal vehicle operation under the condition that the present invention all can lose at shift fork position signal and do not stop, improve travel safety.
Description
Technical field
The present invention relates to automotive transmission control field, be specifically related to the controlling method of double-clutch automatic gearbox limp-home.
Background technique
Double-clutch automatic gearbox comprises two coaxial nested or clutches of being arranged in parallel, coaxially, the interior input shaft of inside and outside nested arrangement and outer input shaft, output shaft, is arranged in the multiple synchromesh gears on output shaft, multiple selector fork and 1 differential mechanism composition.Speed changer odd, even number gear driving gear is arranged on inside and outside input shaft, by switching and the different synchronizer action of two clutches, realizes torque conversion and output.
Limp-home function refer to speed changer occur some component occur damage, normal using function cannot be completed, but can also realize the output of vehicle power within the specific limits, a part of component that current function can be utilized intact complete the function of speed changer.
When driving, electronic control unit (ECU) is needed to be obtained by various sensor the signal of the different groups such as engine rotational speed signal, engine torque signal, vehicle speed signal, shift signal, accelerator opening amount signal thus carries out control realization self shifter to double-clutch automatic gearbox.With reference to figure 1, for wet-type double-clutch automatic speed-change device, realizing automatic gear change function needs automatic transmission case control unit (TCU) to gather different signals by the sensor of double-clutch automatic gearbox inside, wherein clutch rotational speed sensor 1 gathers clutch input speed signal (i.e. clutch driving plate rotating speed, equal engine speed), OSS 2 gathers the tach signal of the first output shaft 13, interior input shaft speed probe 3 gathers the tach signal of interior input shaft 11, outer input shaft speed probe 4 gathers the tach signal of outer input shaft 12, 2/6 gear shift fork position transducer 5, 5/N keeps off shift fork position transducer 6, 3/1 gear shift fork position transducer 7, R/4 keeps off shift fork position transducer 8 and gathers four selector fork position signals respectively, first clutch pressure transducer 9 gathers first clutch pressure signal, second clutch pressure transducer 10 gathers second clutch pressure signal, also there is the second output shaft 14 in the double clutch in Fig. 1, certainly also speed probe can be set for this output shaft 14.But at some in particular cases, such as in motion frequent start-stop or switch gear, the overheated interior input shaft speed probe 3 making automatic transmission inside of signal emitter can be caused, outer input shaft tach signal 4 lost efficacy even all speed probes 1 simultaneously, 2, 3, 4 all lost efficacy, or because the reasons such as line fault cause all speed probes 1, 2, 3, 4 all lost efficacy, although the mechanical n-back test of double-clutch automatic gearbox is still normal, but now TCU is due in cannot judging, outer input shaft and output shaft rotating speed, the control of automatic transmission cannot be proceeded and make car load enter fault mode, throw-out-of clutch makes car load run out of steam and stall or parking suddenly, and when after a period of time, sensor temperature decline works again, TCU controls again automatic transmission after obtaining signal and resumes work, car load accelerates suddenly, and fall off when driving, it is very dangerous for stopping or accelerating, when travelling especially on a highway.
The control logic of existing double-clutch automatic transmission limp-home as shown in Figure 2, when when in interior input shaft or outer input shaft speed probe breaks down, another one is still normal, then control vehicle to stop, then controlling gearshift makes odd even keep off simultaneously in gear traveling, and export based on the detection of normal sensor the input shaft rotating speed calculated corresponding to abnormal sensor, thus realize limp-home function.But first the prerequisite that realizes of the method still has one can normally work in two input shaft speed probes, when the speed probe in speed changer inside is all abnormal, limp-home function cannot be realized; Secondly, the method still needs parking to carry out gear switching, and this remains very dangerous when driving; Again, the method can only travel with the gear of setting, and cannot carry out normal gear switching, but when road conditions is complicated, or when travelling on a highway, gear smoothly must be carried out and switch guarantee safety.
Summary of the invention
The object of the invention is to solve when the speed probe of double-clutch automatic gearbox inside all lost efficacy that vehicle is fallen off, stopping threatens the problem of safety, ensure that vehicle still can limp-home under not Parking condition, The embodiment provides following technological scheme for this reason:
A kind of double-clutch automatic gearbox limp-home controlling method, comprising: gather vehicle speed signal, clutch input speed signal, interior input shaft tach signal, outer input shaft tach signal, output shaft tach signal, selector fork position signal; When described interior input shaft tach signal, outer input shaft tach signal are all lost, whether the speed ratio verification current shift according to described vehicle speed signal, described clutch input speed signal and current shift mates; If current shift is mated, keep current shift to travel, if current shift is not mated, carry out the switching of odd even gear.
Preferably, when described clutch input speed signal, described output shaft tach signal are lost equally, read engine rotational speed signal from engine management system and substitute described clutch input speed signal, still can verify current shift and whether mate.
Preferably, when described interior input shaft tach signal, outer input shaft tach signal are all lost and occurred in gear switching or clutch handoff procedure, first perform gear shifting action according to default pressure and complete clutch switching action.
Preferably, described odd even gear switch step comprises: promote target gear selector fork; Judge whether described selector fork is correctly linked into target gear according to selector fork position signal; If selector fork is correctly linked into target gear, perform clutch switching action; Calculate target gear place input shaft rotating speed according to described vehicle speed signal, engine rotational speed signal and target gear speed ratio, judge whether correctly to complete gear switching action, if correctly, enter normal traveling.
Preferably, if selector fork is not correctly linked into target gear, then performs and move back gear action, then again promote selector fork, be correctly linked into target gear not yet, throw-out-of clutch when promotion selector fork number of times reaches predetermined value.
In the present invention, even if inside and outside input shaft tach signal is all lost, but whether mate due to current shift can be verified out by vehicle speed signal, engine rotational speed signal and current shift speed ratio, if gear coupling, still keep current shift to travel, without the need to gearshift of stopping.
Further, even if clutch input speed signal is also lost, engine rotational speed signal is now adopted to substitute clutch input speed signal, although less deviation may be had, but still the matching verification of current shift can be carried out, meet the verification requirement of limp-home.
Further, even if current shift is not mated, need to carry out gear switching, after selector fork is correctly switched to target gear and clutch switches, according to vehicle speed signal, engine rotational speed signal and target gear speed ratio, indirect calculation can go out the input shaft rotating speed at target gear place, thus judge whether correctly to complete gear switching action, normal gearshift function can be realized when limp-home.
Further, when tach signal all lose occur in gear switch or in clutch handoff procedure time, first perform gear shifting action according to default pressure and complete clutch switching action, can ensure that follow-up current shift matching verification proceeds.
Further, if selector fork correctly cannot be switched to target gear, again attempting switching after moving back gear can improve chance of success, and still incorrect after reaching pre-determined number, then prove that the mechanical actuating mechanism of automatic transmission goes wrong, now just holdback clutch is rational.
Accompanying drawing explanation
Next will be described in further detail specific embodiments of the invention by reference to the accompanying drawings, wherein:
Fig. 1 is a kind of typical double-clutch automatic gearbox structural representation;
Fig. 2 is the double-clutch automatic gearbox limp-home controlling method logic diagram of prior art;
Fig. 3 is the double-clutch automatic gearbox limp-home controlling method logic diagram of embodiments of the invention.
Description of symbols in upper figure: 1 is clutch rotational speed sensor, 2 is OSS, 3 is interior input shaft speed probe, 4 is outer input shaft speed probe, 5 is 2/6 gear shift fork position transducer, 6 is 5/N gear shift fork position transducer, 7 is 3/1 gear shift fork position transducer, 8 is R/4 gear shift fork position transducer, 9 is first clutch pressure transducer, 10 is second clutch pressure transducer, 11 is interior input shaft, 12 is outer input shaft, 13 is output shaft 1, 14 is the second output shaft.
Embodiment
In next described embodiment, although be the wet-type double-clutch automatic speed-change device with two output shafts for example is described, but controlling method of the present invention also can be applied to has single output shaft or multi-output shaft, dry-type dual-clutch automatic transmission, and the quantity of gear is also not limited to the present embodiment.
With reference to figure 1, in wet-type double-clutch automatic speed-change device, realize clutch by oil pump (pump) to two clutch pressurisation and switch.Clutch rotational speed sensor 1 gathers clutch input speed signal (i.e. clutch driving plate rotating speed), first clutch pressure transducer 9 gathers first clutch pressure signal, second clutch pressure transducer 10 gathers second clutch pressure signal, interior input shaft 11 is connected with first clutch, and outer input shaft 12 is connected with second clutch.Outside input shaft 11 is furnished with 1 gear driving gear and 3 gear driving gears, interior input shaft is furnished with 2 gear driving gears and 4 gear driving gears, wherein 3 gear driving gears are used as 5 gear driving gears simultaneously, 4 gear driving gears are used as 6 gear driving gears simultaneously, 2 gear driving gears are simultaneously as the driving gear that reverses gear, like this, odd number gear driving gear is all arranged on interior input shaft 11, and even number gear driving gear is all arranged on outer input shaft 12.First output shaft 13 is furnished with parking ratchet wheel (parklock), 5 gears driven gear (5TH), 6 gears driven gear (6TH) and 2 gears driven gear (2ND), the second output shaft 14 is furnished with 1 gear driven gear (1ST), 3 gears driven gear (3RD), 4 gear driven gear (4TH) and the driven gears that reverse gear (REV).By the gear pair engagement of the switching of first clutch and second clutch and each driving gear, driven gear, realize Power output through differential mechanism (differential).OSS 2 gathers the tach signal of the first output shaft 13, interior input shaft speed probe 3 gathers the tach signal of interior input shaft 11, outer input shaft speed probe 4 gathers the tach signal of outer input shaft 12, and 2/6 gear shift fork position transducer 5,5/N keep off shift fork position transducer 6,3/1 and keep off shift fork position transducer 7, R/4 gear shift fork position transducer 8 collection four selector fork positions respectively.
With reference to figure 3, when driving, ECU constantly can gather vehicle speed signal, accelerator opening amount signal etc., and reads engine rotational speed signal from engine management system (EMS).The clutch input speed signal gathered by TCU, interior input shaft tach signal, outer input shaft tach signal, output shaft tach signal, selector fork position signal also can pass to ECU, and ECU can send instruction according to collected signal to TCU, TCU controls the switching of each selector fork action, first clutch and second clutch.Under normal travel situations, engine speed equals clutch input speed, or only there is less deviation.
When no signal fault, vehicle can normally travel, and once there is signal fault, first judge whether because interior input shaft speed probe 3, outer input shaft speed probe 4 all lost efficacy and caused the tach signal in automatic transmission all to be lost, if otherwise take other control measure described in background technique, if yes then enter subsequent step.
If inside and outside input shaft tach signal is all lost, then TCU cannot obtain clutch input speed, interior input shaft rotating speed, but TCU can record the data of current shift always, due under a certain gear, relation between the speed ratio (velocity ratio) of the speed of a motor vehicle, engine speed and this gear is determined, the relation of each gear velocity ratio of the vehicle of such as certain double-clutch automatic gearbox and engine speed, the speed of a motor vehicle is as shown in table 1.
Table 1
| Gear | Velocity ratio | 1500rpm | 2000rpm | 2500rpm | 3000rpm | 3500rpm | 4000rpm | 4500rpm | 5000rpm | 5500rpm | 6000rpm |
| One gear | 3.545 | 12.761 | 17.016 | 21.268 | 25.522 | 29.775 | 34.029 | 38.283 | 42.536 | 46.79 | 51.044 |
| Two gears | 2.158 | 20.963 | 27.95 | 34.938 | 41.925 | 48.913 | 55.9 | 62.888 | 69.876 | 76.863 | 83.851 |
| Three gears | 1.478 | 30.607 | 40.81 | 51.012 | 61.214 | 71.417 | 81.619 | 91.823 | 102.024 | 112.226 | 122.429 |
| Four gears | 1.129 | 40.069 | 53.425 | 66.781 | 80.137 | 93.493 | 106.85 | 120.206 | 133.562 | 146.918 | 160.274 |
| Five gears | 0.886 | 51.058 | 68.077 | 85.097 | 102.116 | 119.135 | 136.155 | 153.174 | 170.193 | 187.213 | 204.232 |
| Reverse gear | 3.333 | 13.573 | 18.097 | 22.621 | 27.145 | 31.669 | 36.194 | 40.718 | 45.242 | 49.766 | 54.29 |
And in the ordinary course of things, when stable traveling, whether clutch input speed and engine speed are substantially identical, therefore, just can verify current shift mate according to the speed ratio (i.e. velocity ratio) at vehicle speed signal, clutch input speed signal and current shift place.And when if the tach signal comprised in all speed changers of clutch rotational speed sensor 1, OSS 2 is all lost, ECU reads engine rotational speed signal from engine management system (EMS) and substitutes clutch input speed signal, verifies.Such as in 3 gear running process, TCU tach signal is all lost, now TCU is recorded to current shift is 3 gears, corresponding speed ratio is 1.478, ECU is 2500rpm from the engine speed that EMS reads, the vehicle speed signal that ECU obtains is 51 kilometers/hour, then can prove 3 gear couplings, otherwise for not mate.
If current shift is mated, keep current shift to travel, need not stop, ensure safety.
If current shift is not mated, such as accelerator open degree becomes large and engine speed improves, and causes 3 gears not mate, and needs to carry out follow-up odd even gear and switches.
Certainly, because there is the process of putting into gear in advance and switching with clutch in double-clutch automatic gearbox, if when selector fork position signal is all lost and is occurred in gear switching or clutch handoff procedure, first perform gear shifting action according to default pressure and complete clutch switching action, thus automatic transmission is reached at gear travelling state, this is favourable to follow-up verification.The pressure that the pressure of default pressure and the action of automatic transmission factory-designed promotion selector fork or promotion clutch switch.
As shown in the dotted line frame of Fig. 3, switch to perform odd even gear, need first to promote target gear selector fork, if target gear selector fork is correctly linked into, then odd number gear and even number gear respectively have a gear at gear, then perform clutch switching action, and whether calculate target gear place input shaft rotating speed according to vehicle speed signal, engine rotational speed signal and target gear speed ratio correct, thus judge whether correctly to complete gear switching action.Be still 3 gears citings with current shift, because accelerator open degree becomes large, engine speed improves, then 3 gears need to switch to 4 gears, now promotes 4 gear selector forks.If 4 gear selector forks are correctly linked into 4 gears, then now on the second output shaft 14,3 gears, 4 gears, simultaneously at gear, then perform the switching of first clutch and second clutch, engine power are switched to outer input shaft 12 by interior input shaft 11.But, now due to interior input shaft speed probe 3, outer input shaft speed probe 4, OSS 2, clutch input speed sensor 1 all lost efficacy, therefore TCU directly cannot know each axle rotating speed, directly cannot judge that clutch driving plate is synchronous with driven disc whether to complete, but by shift fork position transducer 8, TCU knows that 4 gears are correctly linked into, because each gear speed ratio is definite value, differential mechanism speed ratio is similarly definite value, therefore, according to vehicle speed signal, engine rotational speed signal and 4 gear speed ratios just can calculate the rotating speed of outer input shaft 12, when the rotating speed of outer input shaft 12 reaches 4 correct gear tachometer value, namely mean that the rotating speed of outer input shaft 12 is correct, clutch driving plate and driven disc synchronously complete, the gear switching action that 3 gears change 4 gears correctly completes.This rear vehicle can travel so that 4 gears are normal.
If promote selector fork in target gear selector fork process can not correctly be linked into, now prove there is mechanical failure or other logic fault, then perform and move back gear action, then promotion selector fork is shifted gears again again, and TCU records once-through operation, still has the correct possibility switched through attempting selector fork, now still need not stop, only have and be correctly linked into target gear not yet, throw-out-of clutch when promotion selector fork number of times reaches predetermined value, car load runs out of steam.
Visible from the above description, in whole control procedure, although the tach signal in double-clutch automatic gearbox is all lost, but still self shifter action can be performed safely, need not stop or Reduced Speed Now in limp-home process.
Although the present invention is described in conjunction with above embodiment, but the present invention is not limited to above-described embodiment, and only by the restriction of claim, those of ordinary skill in the art can easily modify to it and change, but do not leave essential idea of the present invention and scope.
Claims (4)
1. a double-clutch automatic gearbox limp-home controlling method, comprising:
Gather vehicle speed signal, clutch input speed signal, interior input shaft tach signal, outer input shaft tach signal, output shaft tach signal, selector fork position signal;
It is characterized in that, when described interior input shaft tach signal, outer input shaft tach signal are all lost, whether the speed ratio verification current shift according to described vehicle speed signal, described clutch input speed signal and current shift mates;
If current shift is mated, keep current shift to travel, if current shift is not mated, carry out the switching of odd even gear;
When described interior input shaft tach signal, outer input shaft tach signal are all lost and occurred in gear switching or clutch handoff procedure, first perform gear shifting action according to default pressure and complete clutch switching action.
2. double-clutch automatic gearbox limp-home controlling method according to claim 1, it is characterized in that, when described clutch input speed signal, described output shaft tach signal are lost equally, substitute described clutch input speed signal from engine management system reading engine rotational speed signal and whether mate to verify current shift.
3. double-clutch automatic gearbox limp-home controlling method according to claim 1 and 2, is characterized in that, described odd even gear switch step comprises:
Promote target gear selector fork;
Judge whether described selector fork is correctly linked into target gear according to selector fork position signal;
If selector fork is correctly linked into target gear, perform clutch switching action;
Calculate target gear place input shaft rotating speed according to described vehicle speed signal, engine rotational speed signal and target gear speed ratio, judge whether correctly to complete gear switching action, if correctly, enter normal traveling.
4. double-clutch automatic gearbox limp-home controlling method according to claim 3, it is characterized in that, if selector fork is not correctly linked into target gear, then perform and move back gear action, then again selector fork is promoted, correctly target gear is linked into not yet, throw-out-of clutch when promotion selector fork number of times reaches predetermined value.
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| FR3034737B1 (en) * | 2015-04-13 | 2017-04-21 | Peugeot Citroen Automobiles Sa | METHOD FOR MANAGING A HYBRID VEHICLE WITH AUTOMATIC GEARBOX IN CASE OF A FAILURE OF THIS BOX |
| CN105465353B (en) * | 2015-12-16 | 2017-10-27 | 安徽江淮汽车集团股份有限公司 | A kind of control method of wet-type dual-clutch gearbox limp-home |
| CN111006011B (en) * | 2018-10-08 | 2021-11-19 | 海马汽车有限公司 | Transmission correction method and device and motor vehicle |
| CN113738864B (en) * | 2021-09-29 | 2022-10-28 | 蜂巢传动科技河北有限公司 | AT transmission control method and system, AT transmission and vehicle |
| CN114542704B (en) * | 2022-01-12 | 2024-06-14 | 中国第一汽车股份有限公司 | Vehicle gear identification method and device, electronic equipment and storage medium |
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| CN103827552A (en) * | 2011-10-05 | 2014-05-28 | 爱信Ai株式会社 | Dual-clutch automatic transmission |
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| CN103827552A (en) * | 2011-10-05 | 2014-05-28 | 爱信Ai株式会社 | Dual-clutch automatic transmission |
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Address after: 230601 Anhui Province, Hefei City Industrial Park, the Peach Blossom Road No. 669 Patentee after: Anhui Jianghuai Automobile Group Limited by Share Ltd Address before: 230601 Anhui Province, Hefei City Industrial Park, the Peach Blossom Road No. 669 Patentee before: Anhui Jianghuai Automotive Co., Ltd. |