CN102537314A - Main oil pressure control method for automatic transmission - Google Patents
Main oil pressure control method for automatic transmission Download PDFInfo
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- CN102537314A CN102537314A CN2011103455749A CN201110345574A CN102537314A CN 102537314 A CN102537314 A CN 102537314A CN 2011103455749 A CN2011103455749 A CN 2011103455749A CN 201110345574 A CN201110345574 A CN 201110345574A CN 102537314 A CN102537314 A CN 102537314A
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- 230000005540 biological transmission Effects 0.000 title claims abstract description 57
- 238000000034 method Methods 0.000 title claims abstract description 30
- 230000001276 controlling effect Effects 0.000 claims description 19
- 238000003745 diagnosis Methods 0.000 claims description 19
- 238000012886 linear function Methods 0.000 claims description 3
- 230000001105 regulatory effect Effects 0.000 claims description 2
- 238000005461 lubrication Methods 0.000 abstract description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 230000009897 systematic effect Effects 0.000 description 2
- FNMKZDDKPDBYJM-UHFFFAOYSA-N 3-(1,3-benzodioxol-5-yl)-7-(3-methylbut-2-enoxy)chromen-4-one Chemical compound C1=C2OCOC2=CC(C2=COC=3C(C2=O)=CC=C(C=3)OCC=C(C)C)=C1 FNMKZDDKPDBYJM-UHFFFAOYSA-N 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 239000000446 fuel Substances 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 239000000314 lubricant Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
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Abstract
The invention relates to a main oil pressure control method for an automatic transmission, which can be used for selecting proper oil pressure according to different conditions. The proper main oil pressure value is determined by judging parameters such as the state of the transmission, main oil pressure needed by a current gear, main oil pressure needed by a hot mode, main oil pressure needed by a high-speed mode, main oil pressure needed by a specific mode and the like, so that sufficient lubrication is realized, and the efficiency of the automatic transmission can be ensured. The main oil pressure control method is applied to all automotive automatic transmissions.
Description
Technical field
The present invention relates to a kind of hydraulic control method, especially relate to a kind of main oil pressure controlling method of automatic gearbox.
Background technique
Hydraulic transmission is widely used in automotive industry.Hydraulicdriven application in the car transmissions is one of them main application.In this type systematic, oil pressure is a main control target, and still according to the use condition of solenoid valve, pressure control is different again.Pressure control also is the pith that this type systematic reaches a suitable performance.
In the automatic gearbox system, the control of electronic controlled transmission also mainly is the pressure that is used to control hydraulic circuit.Pressure control in the hydraulic system mainly is the control that is used to control different units in the automatic transmission, comprises planetary engagement.Although be not quite similar with manual transmission as the change of epicyclic gear system states such as gear selection, gear shift, through the combination of different planetary gear set, the automatic transmission system just can realize the gear shift function identical with manual transmission.
In general, automobile-used automatic transmission case has several gears, advances or retreats the gear ratio of desired transmission input shaft and output shaft to realize vehicle.Vehicle is different to the demand of main oil pressure value under different working conditions.In order to improve fuel economy, raise the efficiency, should reduce the main oil pressure value, to improve oil pump efficient.But oil pressure reduces, and might cause that the cunning of clutch friction plate is rubbed, and causes efficient lower, therefore, still need keep a specific pressure, raises the efficiency satisfying under the prerequisite of function.The control of this pressure generally also is to depend on the input torque of speed changer and some other condition.
As everyone knows, the Clutch Control of automatic transmission plays crucial effects in the vehicle drive process, and convenience and travelling comfort when its performance quality and driver drive are closely related.Cross when low when automatic transmission main oil pressure value, cause that the clutch friction plate cunning rubs, enough lubricant oil can't be provided, too high when oil pressure, oil pump efficient reduces, and can influence the efficient of automatic transmission.Therefore, need under condition of different, different conditions, adopt different main oil pressure values,, improve the optimum efficiency of transmission efficiency simultaneously so that reach travelling comfort, the Economy of driving.
Summary of the invention
The present invention solves the technical problem that existing in prior technology main oil pressure value is difficult to adapt to the demand of different situations; Provide a kind of suitable main oil pressure value can be provided under different situations; Enough lubrications promptly are provided, can guarantee the automatic transmission main oil pressure controlling method of the efficient of automatic transmission again.
The present invention is directed to above-mentioned technical problem mainly is able to solve through following technical proposals: a kind of main oil pressure controlling method of automatic transmission; The control module that is used for automatic transmission is regulated the inner main oil pressure value of speed changer; Control module stores normality oil pressure value, oil pressure minimum value, oil pressure maximum value, fault diagnosis oil pressure value and gearshift management oil pressure value, and main oil pressure control may further comprise the steps:
Step 1, control module judge automatic transmission current whether be gearshift fault diagnosis state, if when that is: automatic transmission was in gearshift fault diagnosis state, control module to the main oil pressure value, and changed fault diagnosis oil pressure value assignment over to step 4; If, then do not change step 2 over to;
Step 2, control module are judged the current gearshift controlled state that whether is in of automatic transmission, if when that is: automatic transmission is in the gearshift controlled state, control module will be shifted gears management oil pressure value assignment to the main oil pressure value, and change step 4 over to; If, then do not change step 3 over to;
Step 3, control module with normality oil pressure value assignment to the main oil pressure value;
Whether step 4, control module judge the main oil pressure value less than the oil pressure minimum value, if that is: the main oil pressure value is less than the oil pressure minimum value, then again with oil pressure minimum value assignment to the main oil pressure value, and change step 1 over to, repeat above-mentioned circulation; Then the main oil pressure value is constant, and changes step 5 over to if not;
Whether step 5, control module judge the main oil pressure value greater than the oil pressure maximum value, if that is: the main oil pressure value is greater than the oil pressure maximum value, again with oil pressure maximum value assignment to the main oil pressure value; Then the main oil pressure value is constant, and changes step 1 over to, repeats above-mentioned circulation if not.
Control module constantly repeats above-mentioned circulation, adjusts the main oil pressure value of automatic transmission in real time.
As preferably; In the said step 3; The normality oil pressure value confirms that according to the main oil pressure of current gear demand, the main oil pressure of heat pattern demand, the main oil pressure of fast mode demand and the main oil pressure of AD HOC demand said normality oil pressure is the maximum value in above-mentioned four main oil pressures.
As preferably, the main oil pressure of current gear demand is obtained by following linear function:
P
_gear=mτ
Input+P
0
In the formula, P
_ gearBe the main oil pressure of current gear demand, τ
InputBe the moment of torsion input of clutch, m is current clutch moment of torque oil pressure coefficient, P
0Be the demand oil pressure side-play amount of the corresponding clutch of current gear, for each range state, moment of torsion oil pressure coefficient and side-play amount are calibration value.
As preferably, under the situation of a plurality of clutches, each clutch calculates the main oil pressure of demand separately, and the maximum value of getting then wherein is the main oil pressure of current gear demand.
As preferably, store the minimum oil pressure of heat pattern in the said control module, when heat pattern activated, the main oil pressure of setting the heat pattern demand was the minimum oil pressure of heat pattern; When the heat pattern un-activation, the main oil pressure of setting the heat pattern demand is 0.
As preferably, said control module stores rated engine speed and the minimum oil pressure of high rotating speed, and the main oil pressure of setting high-speed mode requirement is the minimum oil pressure of high rotating speed when engine speed is higher than rated engine speed; When engine speed was not higher than rated engine speed, the main oil pressure of setting high-speed mode requirement was 0.
As preferably, said control module stores the AD HOC oil pressure, and when vehicle is in starting, garage gearshift situation following time, the main oil pressure of setting the AD HOC demand is the AD HOC oil pressure, and the main oil pressure of other times AD HOC demand is 0.
As preferably, maximum value in four main oil pressures and the peaked variance ratio of a last circuit are less than 1500bar/s.Variance ratio be twice maximum value difference and twice cycle time ratio at interval, reacted the pace of change of main oil pressure.Suitable pace of change can guarantee to drive the fluency of controlling.According to the upper limit that can adjust changing value under the different situations, general span is 4-1500bar/s.
The substantial effect that the present invention brings is, 1, the present invention adopts the controlling method of main oil pressure strategy, makes the more perfect function of automatic transmission fluid pressure-controlled.
2, the present invention increases the main oil pressure strategy, makes automatic transmission under condition of different, adopt different main oil pressures, has improved transmission efficiency.
3, the strategy based on " oil pressure range of set value " of the present invention adopts the maximin restriction of oil pressure, has prevented the excessive too small damage that possibly cause the automatic transmission system of speed changer oil pressure.
4, the main oil pressure controlling method of automatic transmission of the present invention has been set the maximum value of oil pressure variance ratio, has prevented the oil pressure sudden change, protected the system zero parts, the main oil pressure fluctuation brings when having avoided gear shift, starting and cruising vibration and impact.
5, main oil pressure controlling method of the present invention is applicable to various types of wet-type double-clutch automatic speed-change devices and AT automatic transmission.
Description of drawings
Fig. 1 is that a kind of main oil pressure of the present invention is confirmed method flow diagram;
Fig. 2 and Fig. 3 are that a kind of normality oil pressure of the present invention is confirmed method flow diagram.
Embodiment
Pass through embodiment below, and combine accompanying drawing, do further bright specifically technological scheme of the present invention.
Embodiment: the controlling method of a kind of automatic transmission of present embodiment; Be applied to planet row formula electricity liquid automatic transmission, in the working procedure of automatic transmission, this controlling method can be according to different gears and the needed main oil pressure of condition calculating; Simultaneously the main oil pressure request under the different situations is handled; This controlling method comprises by choosing maximum value in the minimum main oil pressure demand that range state is confirmed, heat pattern, high pressure demand, high rotating speed are confirmed, when the main oil pressure that do not have gear shift management and gear shift fault diagnosis to confirm, adopts this maximum value as system's main oil pressure; When main oil pressure that gear shift management and gear shift fault diagnosis are confirmed; Do not adopt above-mentioned maximum value, the main oil pressure (when not having fault diagnosis, adopting gear shift management oil pressure) that adopts the gear shift fault diagnosis to confirm as main oil pressure.
In the process of automatic transmission work, Different control module in the automatic transmission, the Different control function is different to the demand of oil pressure, in order to satisfy the requirement of each functions of modules, need control main oil pressure Pmain.
Definite process of Pmain comprises the steps.
Main oil pressure control may further comprise the steps:
Step 1, control module judge automatic transmission current whether be gearshift fault diagnosis state, if when that is: automatic transmission was in gearshift fault diagnosis state, control module to the main oil pressure value, and changed fault diagnosis oil pressure value assignment over to step 4; If, then do not change step 2 over to;
Step 2, control module are judged the current gearshift controlled state that whether is in of automatic transmission, if when that is: automatic transmission is in the gearshift controlled state, control module will be shifted gears management oil pressure value assignment to the main oil pressure value, and change step 4 over to; If, then do not change step 3 over to;
Step 3, control module with normality oil pressure value assignment to the main oil pressure value;
Whether step 4, control module judge the main oil pressure value less than the oil pressure minimum value, if that is: the main oil pressure value is less than the oil pressure minimum value, then again with oil pressure minimum value assignment to the main oil pressure value, and change step 1 over to, repeat above-mentioned circulation; Then the main oil pressure value is constant, and changes step 5 over to if not;
Whether step 5, control module judge the main oil pressure value greater than the oil pressure maximum value, if that is: the main oil pressure value is greater than the oil pressure maximum value, again with oil pressure maximum value assignment to the main oil pressure value; Then the main oil pressure value is constant, and changes step 1 over to, repeats above-mentioned circulation if not.
Said operating method step 3; The normality oil pressure value confirms that according to the main oil pressure of current gear demand, the main oil pressure of heat pattern demand, the main oil pressure of fast mode demand and the main oil pressure of AD HOC demand the normality oil pressure value is the maximum value in above-mentioned four main oil pressures.
The main oil pressure of current gear demand uses following linear function to calculate according to the input torque of speed changer:
P
_gear=mτ
Input+P
0
P
_ gearThe main oil pressure of current gear demand
τ
InputThe moment of torsion input
The moment of torsion oil pressure coefficient that m is current
For each range state, moment of torsion oil pressure coefficient and side-play amount are calibration value.
More than be the oil pressure demand of single clutch, for automatic transmission, the clutch of working simultaneously has 2 even more.For the situation of two clutches, the main oil pressure that adopts two clutches to need calculates respectively, gets maximum value.As shown in the formula.
P
_gear =?max?(?m
1|τ
Input|?+?p
1,m
2|τ
Input|?+?p
2)
In the step 3, comprise that also heat pattern main oil pressure demand is definite.In order to improve the flow of lubricated cooling, when heat pattern activates, give the heat pattern main oil pressure with minimum essential requirement oil pressure assignment.When heat pattern did not activate, heat pattern main oil pressure demand was 0.
Step 3 also comprises the main oil pressure demand of AD HOC.Under situation such as starting, garage gear shift, have the high pressure demand, these high pressure requirements are calibration value, and synchronization, have only a kind of state to activate, and the main oil pressure demand of AD HOC is assigned the corresponding calibration value of state when state activates; When these patterns did not activate, AD HOC main oil pressure demand was 0.
Step 3 comprises that also the main oil pressure demand is confirmed under the high rotating speed pattern, and is overheated in order to prevent speed changer when engine speed is higher than certain rated engine speed, and the minimum main oil pressure value assignment that maximum speed is corresponding is down given main oil pressure under the high rotating speed pattern.
Step 3 also comprises under comparison AD HOC, range state, high rotating speed pattern, the heat pattern main oil pressure of confirming, with the oil pressure maximum value of demand under above-mentioned each pattern as main oil pressure.
Step 3 also comprises for the maximum main oil pressure of confirming, limits its variance ratio.Be each program cycle cycle, can not make the oil pressure demand that excessive fluctuation is arranged.When demand oil pressure that this demand oil pressure was confirmed greater than the last time, the oil pressure increment can only be less than setting value.
Like Fig. 1, Fig. 2 and shown in Figure 3, the flow process that said main oil pressure is confirmed comprises:
(1) carries out the order 101 that main oil pressure is confirmed beginning, and then get into the gearshift fault diagnosis request 102 that judged whether;
(2) when having judged whether the request 102 of gearshift fault diagnosis, if the request of gearshift fault is arranged, then main oil pressure Pmain equals fault diagnosis state oil pressure P_SHMD 103, if do not shift gears the fault request, has then judged whether gearshift request 104;
(3) judging whether gearshift request 104 o'clock, if the gearshift request is arranged, then main oil pressure Pmain equals gearshift management oil pressure P_SHM 105; If not gearshift request, the main oil pressure that then gets under the normal condition confirms 201;
(4) main oil pressure under the normal condition confirms that 201 may further comprise the steps; Calculate speed changer input torque 202 earlier; Detect work at present gear 203 then; Then will give the first intermediate variable P1 204, judge whether to satisfy the condition 205 that gets into heat pattern then by the oil pressure demand P_gear assignment of current range state decision;
(5) when judging whether to satisfy the condition 205 that gets into heat pattern,, then make the second variable P2 equal the oil pressure demand P_Hot_model 207 that confirms by heat pattern if satisfy; If do not satisfy the condition that gets into heat pattern, then a shilling oil pressure demand P_Hot_model who is confirmed by heat pattern is 0 206, makes the second variable P2 equal the oil pressure demand P_Hot_model 207 that is confirmed by heat pattern then;
After the oil pressure demand P_Hot_model 207 that (6) second variable P2 equal to be confirmed by heat pattern; Judge whether to satisfy the high rotating speed mode condition 208 of entering; If satisfy, then make ternary P3 equal the oil pressure demand P_high_speed 210 that confirms by fast mode; Do not get into high rotating speed mode condition if do not satisfy, then a shilling oil pressure demand P_high_speed who is confirmed by fast mode is 0 209, makes ternary P3 equal the oil pressure demand P_high_speed 210 that is confirmed by fast mode then;
Judge whether to satisfy the AD HOC condition 211 that gets into after the oil pressure demand P_high_speed 210 that (7) ternary P3 equal to be confirmed by fast mode; If satisfy; Then make the 4th variable P4 equal the oil pressure demand P_special_model 213 that confirms by special pattern, get into step 214 then; If do not satisfy the AD HOC condition that gets into, then Schilling makes the 4th variable P4 equal the oil pressure demand P_special_model that is confirmed by special pattern by the definite oil pressure demand P_special_model 212 of special pattern then, then gets into step 214;
(8) confirmed after the value of P1, P2, P3 and four variablees of P4; The size that compares P1, P2, P3, P4; The maximum value of getting wherein is P1max 214; Whether the variance ratio of judging a current circuit variable maximum P1max and a last circuit variable maximum P1max_previous then is greater than predefined value K 215, and the variance ratio formula is:
Variance ratio=| (P1max-P1max_previous) |/s
K is made as 1500bar/s, and can adjust as required; If variance ratio is less than or equal to K, then make normality oil pressure P5 equal P1max 217, then get into step 218; If variance ratio is greater than K, and current circuit variable maximum P1max then makes normality oil pressure P5 equal P1max_previous+t*K greater than a last circuit variable maximum P1max_previous, then gets into step 218; If variance ratio is greater than K, and current circuit variable maximum P1max then makes normality oil pressure P5 equal P1max_previous-t*K less than a last circuit variable maximum P1max_previous, then gets into step 218;
(9) make main oil pressure Pmain equal normality oil pressure P5, and get into step 107;
(10) obtain after the main oil pressure Pmain 107, whether judge main oil pressure Pmain less than the oil pressure minimum value Pmin 108 that sets, if, then make main oil pressure Pmain equal oil pressure minimum value Pmin 109, jump to step 101 then; If main oil pressure Pmain, judges then that whether main oil pressure Pmain is greater than the oil pressure maximum value Pmax 111 that sets more than or equal to the oil pressure minimum value Pmin that sets;
(11) judge that main oil pressure Pmain whether during greater than the oil pressure maximum value Pmax that sets 111, if main oil pressure Pmain then makes main oil pressure Pmain equal oil pressure maximum value Pmax 109 greater than the oil pressure maximum value Pmax that sets, jumps to step 101 then; If main oil pressure Pmain is less than or equal to the oil pressure maximum value Pmax of setting, then jump to step 101.
Variable declaration:
Pmax oil pressure maximum value
Pmin oil pressure minimum value
P_gear is by the oil pressure demand of current range state decision
The oil pressure demand that P_Hot_model is confirmed by heat pattern
The oil pressure demand that P_special_model is confirmed by special pattern
The oil pressure demand that P_high_speed is confirmed by fast mode
Oil pressure maximum value in each pattern of P1max
The main oil pressure that the last circulation of P1max_previous obtains
P1, P2, P3, P4 intermediate variable;
P5 normality oil pressure
Oil pressure demand during P_SHM gear shift management
Oil pressure demand during the P_SHMD fault diagnosis
The K main oil pressure is at the variance ratio of each circulation time
Specific embodiment described herein only is that the present invention's spirit is illustrated.Person of ordinary skill in the field of the present invention can make various modifications or replenishes or adopt similar mode to substitute described specific embodiment, but can't depart from spirit of the present invention or surmount the defined scope of appended claims.
Although this paper has used terms such as main oil pressure, fast mode morely, do not get rid of the possibility of using other term.Using these terms only is in order to describe and explain essence of the present invention more easily; It all is contrary with spirit of the present invention being construed to any additional restriction to them.
Claims (8)
1. the main oil pressure controlling method of an automatic transmission; The control module that is used for automatic transmission is regulated the inner main oil pressure value of speed changer; It is characterized in that; Control module stores oil pressure minimum value, oil pressure maximum value, fault diagnosis oil pressure value and gearshift management oil pressure value, and main oil pressure control may further comprise the steps:
Step 1, control module judge automatic transmission current whether be gearshift fault diagnosis state, if when that is: automatic transmission was in gearshift fault diagnosis state, control module to the main oil pressure value, and changed fault diagnosis oil pressure value assignment over to step 4; If, then do not change step 2 over to;
Step 2, control module are judged the current gearshift controlled state that whether is in of automatic transmission, if when that is: automatic transmission is in the gearshift controlled state, control module will be shifted gears management oil pressure value assignment to the main oil pressure value, and change step 4 over to; If, then do not change step 3 over to;
Step 3, control module with normality oil pressure value assignment to the main oil pressure value;
Whether step 4, control module judge the main oil pressure value less than the oil pressure minimum value, if that is: the main oil pressure value is less than the oil pressure minimum value, then again with oil pressure minimum value assignment to the main oil pressure value, and change step 1 over to, repeat above-mentioned circulation; Then the main oil pressure value is constant, and changes step 5 over to if not;
Whether step 5, control module judge the main oil pressure value greater than the oil pressure maximum value, if that is: the main oil pressure value is greater than the oil pressure maximum value, again with oil pressure maximum value assignment to the main oil pressure value; Then the main oil pressure value is constant, and changes step 1 over to, repeats above-mentioned circulation if not.
2. the main oil pressure controlling method of automatic transmission according to claim 1; It is characterized in that; In the said step 3; The normality oil pressure confirms that according to the main oil pressure of current gear demand, the main oil pressure of heat pattern demand, the main oil pressure of fast mode demand and the main oil pressure of AD HOC demand said normality oil pressure is the maximum value in above-mentioned four main oil pressures.
3. the main oil pressure controlling method of automatic transmission according to claim 2 is characterized in that, the main oil pressure of current gear demand is obtained by following linear function:
P
_gear=mτ
Input+P
0
In the formula, P
_ gearBe the main oil pressure of current gear demand, τ
InputBe the moment of torsion input of clutch, m is current clutch moment of torque oil pressure coefficient, P
0Be the demand oil pressure side-play amount of the corresponding clutch of current gear, for each range state, moment of torsion oil pressure coefficient and side-play amount are calibration value.
4. the main oil pressure controlling method of automatic transmission according to claim 3 is characterized in that, under the situation of a plurality of clutches, each clutch calculates the main oil pressure of demand separately, and the maximum value of getting then wherein is the main oil pressure of current gear demand.
5. the main oil pressure controlling method of automatic transmission according to claim 2 is characterized in that, stores the minimum oil pressure of heat pattern in the said control module, and when heat pattern activated, the main oil pressure of setting the heat pattern demand was the minimum oil pressure of heat pattern; When the heat pattern un-activation, the main oil pressure of setting the heat pattern demand is 0.
6. the main oil pressure controlling method of automatic transmission according to claim 2; It is characterized in that; Said control module stores rated engine speed and the minimum oil pressure of high rotating speed, and the main oil pressure of setting high-speed mode requirement is the minimum oil pressure of high rotating speed when engine speed is higher than rated engine speed; When engine speed was not higher than rated engine speed, the main oil pressure of setting high-speed mode requirement was 0.
7. the main oil pressure controlling method of automatic transmission according to claim 2; It is characterized in that; Said control module stores the AD HOC oil pressure; When vehicle is in starting, garage gearshift situation following time, the main oil pressure of setting the AD HOC demand is the AD HOC oil pressure, and the main oil pressure of other times AD HOC demand is 0.
8. according to the main oil pressure controlling method of any described automatic transmission in the claim 1 to 7, it is characterized in that maximum value in four main oil pressures and the peaked variance ratio of a last circuit are less than 1500bar/s.
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| CN103075441A (en) * | 2013-01-18 | 2013-05-01 | 浙江吉利汽车研究院有限公司杭州分公司 | Clutch controlling method for automatic transmission |
| CN104458119A (en) * | 2013-09-12 | 2015-03-25 | 上海汽车集团股份有限公司 | Hydraulic gearbox hydraulic sensor fault diagnosis device and method thereof |
| CN104728427A (en) * | 2015-03-03 | 2015-06-24 | 盛瑞传动股份有限公司 | Protection method for too low pressure of gearbox main oil path |
| CN106402376A (en) * | 2016-10-10 | 2017-02-15 | 联合汽车电子有限公司 | Pressure control method of main oil way of automatic transmission |
| CN107035855A (en) * | 2016-12-20 | 2017-08-11 | 安徽江淮汽车集团股份有限公司 | A kind of wet-type dual-clutch main oil pressure control method and system |
| CN108518478A (en) * | 2018-04-08 | 2018-09-11 | 吉泰车辆技术（苏州）有限公司 | Double-clutch speed changer main oil pressure self-adaptation control method and system |
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