CN106762986B - A kind of detection method of double-clutch speed changer hydraulic system filter failure - Google Patents

A kind of detection method of double-clutch speed changer hydraulic system filter failure Download PDF

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Publication number
CN106762986B
CN106762986B CN201710049911.7A CN201710049911A CN106762986B CN 106762986 B CN106762986 B CN 106762986B CN 201710049911 A CN201710049911 A CN 201710049911A CN 106762986 B CN106762986 B CN 106762986B
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clutch
pressure
oil
filter failure
gear
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CN106762986A (en
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陈建勋
刘振宇
梁伟朋
王建忠
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FAW Group Corp
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FAW Group Corp
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B19/00—Testing; Calibrating; Fault detection or monitoring; Simulation or modelling of fluid-pressure systems or apparatus not otherwise provided for
    • F15B19/005—Fault detection or monitoring

Abstract

The invention discloses a kind of detection method of double-clutch speed changer hydraulic system filter failure, including step to be：Vehicle launch step；Gearbox oil temperature is more than setting value judgment step；Gear is being kept off in gear quantity-sensing step, only a gear；Gearshift request judgment step in setting time；The oil-filled step of inoperative clutch；Pressure differential calculation procedure；Filter failure judgment step and filter failure determination step.The present invention is not in the case where changing mechanical structure and installing external sensor additional, and the method for detection filter filter capacity, when filter failure, can in time identify and send signal, avoid that transmission pressure system is caused further to pollute in real time.Meanwhile this method is the sensor utilized in script hydraulic system, it is not necessary to which additional sensor, saves design alteration and the production cost of hardware.In addition, key parameter can also be demarcated according to the difference of different transmission pressure system characteristics, it is versatile.

Description

A kind of detection method of double-clutch speed changer hydraulic system filter failure
Technical field
The present invention relates to automatic speed variator hydraulic system, particularly a kind of double-clutch speed changer hydraulic system filter failure Detection method.
Background technology
Double-clutch speed changer（DCT）It is to add a clutch on the basis of traditional single clutch speed changer, is shifting gears During by the cooperatings of two clutches, complete gear switching.Compared with traditional single clutch speed changer, solve and change The problem of keeping off power interruption.Since the cost of DCT compares automatic transmission（AT）And buncher（CVT）It is much lower, and The processing and manufacturing technology relative maturity of state's interior axle tooth, transmission efficiency, reliable operation, therefore the domestic application to DCT are increasingly It is more.
The clutch operating of wet dual clutch transmission is completed by HYDRAULIC CONTROL SYSTEM, the cleannes of hydraulic system It is to be ensured by the filter in oil circuit, if filter, because impurity accumulation causes to fail, the impurity in hydraulic oil does not have Have and enter hydraulic control system by filtering, it will cause the failure of hydraulic control system, ultimately result in TRANS PROGRAM.
The replacement mileage of general double-clutch speed changer filter is all obtained by complete vehicle test, but this method is not It can solve the filter premature failure situation caused by damage.
The content of the invention
In view of the above-mentioned deficiencies of the prior art, the technical problem to be solved by the present invention is to provide a kind of double-clutch speed changer The detection method of hydraulic system filter failure, the detection method of the double-clutch speed changer hydraulic system filter failure can become During fast device use, the state of hydraulic system mesohigh oil passage filter can be detected automatically, can be identified in time because of improper work Filter premature failure situation caused by condition.
In order to solve the above technical problems, the technical solution adopted by the present invention is：
A kind of detection method of double-clutch speed changer hydraulic system filter failure, includes the following steps.
Step 1, vehicle launch：Clutch pressure sensor gathers the work cavity pressure of corresponding clutch in real time, and will adopt The working chamber pressure value of collection feeds back to control unit for automatic shift TCU；Control unit for automatic shift TCU can record two automatically The actual pressure value of a clutch and order pressure value.
Step 2, gearbox oil temperature judges：Gearbox oil temperature is detected in real time, and by the transmission oil temperature value of detection Judge compared with setting value T.
Step 3, gear is detected in gear number amount：When the transmission oil temperature value that step 2 detects is more than setting value T, to gear It is detected in gear number amount and pre- put into gear.
Step 4, gearshift request judges in setting time：Confirm there was only a gear after step 3 detects in gear and without pre- After putting into gear, control unit for automatic shift TCU judges whether have gearshift to ask in setting time t1, wherein t1>3s.
Step 5, inoperative clutch is oil-filled：It is right when step 4 judging result is in setting time t1 without gearshift request Inoperative clutch carries out oil-filled, and the oil-filled duration is t2, and t2<t1.
Step 6：Pressure differential calculates：Pressure differential, which calculates, to be included the following steps.
Step 61, oil-filled preceding pressure differential calculates：Before inoperative clutch is oil-filled, the reality of the work cavity pressure of operative clutch Border collection value is P1, and at this time, the order pressure of operative clutch and the mathematic interpolation of actual pressure are △ P11.
Step 62, maximum pressure differential calculates in Oil feeding process：In inoperative clutch Oil feeding process, the work of operative clutch It is P2 to make the minimum value that cavity pressure is collected, at this time, the order pressure of operative clutch and the maximum difference meter of actual pressure Calculate as △ P12.
Step 63, oil-filled front and rear maximum differential pressure calculates：Oil-filled front and rear, the pressure change maximum difference of operative clutch is denoted as △ P13, then △ P13=△ P12- △ P11.
Step 7, filter failure judges：The △ P13 that step 63 calculates are compared with the pressure drop boundary condition P3 set Compared with judgement；As △ P13>P3, and when △ P12 are more than 0, are then determined as filter failure, record 1 filter failure.
Step 8, filter failure judges：Step 1- steps 7 are continuously circulated into n times, N >=3, if filter failure is sentenced every time It is disconnected when being failure, then judge filter failure.
In the step 2, the setting value T of gearbox oil temperature is 20 DEG C.
In the step 4, the setting time t1 for request of shifting gears is 10s.
In the step 7, pressure drop boundary condition P3=0.6bar of setting.
In the step 8, step 1- steps 7 are continuously circulated 5 times, when it is failure that 5 filter failures, which judge, then Judge filter failure.
After the present invention uses the above method, have the advantages that：
1. in the case where not changing mechanical structure and installing external sensor additional, the side of filter filter capacity is detected in real time Method, when filter failure, can in time identify and send signal, avoid that transmission pressure system is caused further to pollute.Together When, this method be utilize script hydraulic system in sensor, it is not necessary to additional sensor, save hardware design alteration and Production cost.
2. key parameter can be demarcated according to the difference of different transmission pressure system characteristics, it is versatile.Specifically Method is：In above-mentioned steps 1 to 8, oil temperature setting value T, shift gears request time t1, inoperative clutch precharge pressure P4, oil-filled Time t2, operative clutch pressure change maximum difference P13 is scalar quantity.Can be according to speed change during using this method Device oil viscosity-temperature characteristics, clutch disengaging spring pressure, clutch oil pocket volume, filter pressure drop loss etc. are demarcated, can be with Meet judgement of the different double-clutch speed changer hydraulic systems to filter failure.
Brief description of the drawings
Fig. 1 shows the stress control schematic diagram of double-clutch speed changer hydraulic system in the prior art.
Fig. 2 shows the pressure differential signal in the detection method of double-clutch speed changer hydraulic system filter failure of the present invention Figure.
Fig. 3 shows the flow chart in the detection method of double-clutch speed changer hydraulic system filter failure of the present invention.
Embodiment
The present invention is described in further detail with specific better embodiment below in conjunction with the accompanying drawings.
As shown in Figure 1, double clutch control pressurer system of the prior art includes transmission pressure system working connection, mistake Filter, double clutch pressure-regulating valve and two clutch pressure sensors.
Hydraulic oil in transmission pressure system working connection is delivered to two clutch pressure tune after filter filters Valve inlet is saved, clutch pressure sensor is between clutch pressure modulation valve and clutch, the corresponding clutch of measurement in real time Real work cavity pressure.
As shown in figure 3, a kind of detection method of double-clutch speed changer hydraulic system filter failure, includes the following steps.
Step 1, vehicle launch：Clutch pressure sensor gathers the work cavity pressure of corresponding clutch in real time, and will adopt The working chamber pressure value of collection feeds back to control unit for automatic shift TCU；Control unit for automatic shift TCU can record two automatically The actual pressure value of a clutch and order pressure value.
Step 2, gearbox oil temperature judges：Gearbox oil temperature is detected in real time using oil temperature sensor, and will detection Transmission oil temperature value judge compared with setting value T.
Here, the setting value T of gearbox oil temperature is preferably 20 DEG C.The setting value T of gearbox oil temperature cannot be too low, because low Under oil temperature, transmission oil viscosity is big, poor fluidity, and pressure drop is big before and after filter, and judging result can be interfered.
Step 3, gear is detected in gear number amount：When the transmission oil temperature value that step 2 detects is more than setting value T, Ye Ji great When 20 DEG C, gear is detected in gear number amount and pre- put into gear.
It is in gear number amount and the preferred detection mode put into gear in advance：Control unit for automatic shift TCU is according to selector fork position Put and gear is detected in gear number amount and pre- put into gear.
Step 4, gearshift request judges in setting time：Confirm there was only a gear after step 3 detects in gear and without pre- After putting into gear, control unit for automatic shift TCU judges whether have gearshift to ask in setting time t1, wherein t1>3s, is preferably 10s, so as to ensure that inoperative clutch has the enough oil-filled time.
It can be speed changer handle position, gas pedal aperture whether to have the basis for estimation that gearshift is asked in setting time t1 Or one kind in transmission output speed acceleration magnitude etc..
It is assumed that after vehicle launch, transmission oil temperature value is more than 20 DEG C, and control unit for automatic shift TCU is detected at 1 gear In not putting into gear in advance in working status, even number axis.At this time, control unit for automatic shift TCU is judged according to when front output shaft turns The stand-by period that fast interconversion rate pre-hung 2 is kept off is more than 10s, and therefore, filter failure detection method enters state of activation.
Step 5, inoperative clutch is oil-filled：It is right when step 4 judging result is in setting time t1 without gearshift request Inoperative clutch carries out oil-filled, and the oil-filled duration is t2, and t2<t1.
In this step, as shown in Fig. 2, oil-filled order pressure is P4, the time that oil-filled order pressure reaches P4 should be less than 100ms, then carries out oil-filled, and the oil-filled duration is t2, and preferably 0.5s<t2<t1.
Wherein oil-filled order pressure P4 should be greater than the elastic force of clutch disengaging spring, wherein, t2>0.5s, makes oil-filled lasting Time can guarantee that clutch oil pocket is completely oil-filled；And t2<T1, then be to ensure to ask without gearshift in inoperative clutch Oil feeding process Ask.
Step 6：Pressure differential calculates：Include the following steps as shown in Fig. 2, pressure differential calculates.
Step 61, oil-filled preceding pressure differential calculates：Before inoperative clutch is oil-filled, the reality of the work cavity pressure of operative clutch Border collection value is P1, and at this time, the order pressure of operative clutch and the mathematic interpolation of actual pressure are △ P11.
It is assumed that at this time, odd number shaft clutch order pressure and actual pressure difference are △ P11=0.2bar。
Step 62, maximum pressure differential calculates in Oil feeding process：In inoperative clutch Oil feeding process, the work of operative clutch It is P2 to make the minimum value that cavity pressure is collected, at this time, the order pressure of operative clutch and the maximum difference meter of actual pressure Calculate as △ P12.
Assuming that even number shaft clutch order pressure is changed into P4=7bar out of off working state P4=0bar, 10ms, and continue 3 Second.Odd number shaft clutch order pressure and actual pressure difference, maximum difference △ P are recorded during this12=1.0bar。
Step 63, oil-filled front and rear maximum differential pressure calculates：Oil-filled front and rear, the pressure change maximum difference of operative clutch is denoted as △ P13, then △ P13=△ P12- △ P11.
Step 7, filter failure judges：The △ P13 that step 63 calculates are compared with the pressure drop boundary condition P3 set Compared with judgement；As △ P13>P3, and when △ P12 are more than 0, are then determined as filter failure, record 1 filter failure.
Pressure drop boundary condition P3=0.6bar of setting, odd number shaft clutch pressure difference value △ P during this13=△P12-△ P11=0.8bar, more than the pressure drop Failure Boundaries condition of setting, records this filter failure and is detected as failure.
Step 8, filter failure judges：Step 1- steps 7 are continuously circulated into n times, N >=3, are preferably 5 times.If each mistake When filter breakdown judge is failure, then filter failure is judged.
The preferred embodiment of the present invention described in detail above, still, during present invention is not limited to the embodiments described above Detail, in the range of the technology design of the present invention, a variety of equivalents can be carried out to technical scheme, this A little equivalents belong to protection scope of the present invention.

Claims (5)

  1. A kind of 1. detection method of double-clutch speed changer hydraulic system filter failure, it is characterised in that：Include the following steps：
    Step 1, vehicle launch：Clutch pressure sensor gathers the work cavity pressure of corresponding clutch in real time, and by collection Working chamber pressure value feeds back to control unit for automatic shift TCU；Control unit for automatic shift TCU can record automatically two from The actual pressure value of clutch and order pressure value；
    Step 2, gearbox oil temperature judges：Gearbox oil temperature is detected in real time, and by the transmission oil temperature value of detection with setting Definite value T is compared judgement；
    Step 3, gear is detected in gear number amount：When the transmission oil temperature value that step 2 detects is more than setting value T, gear is being kept off Quantity and pre- put into gear are detected；
    Step 4, gearshift request judges in setting time：Confirm there was only a gear in gear and without putting into gear in advance after step 3 detects Afterwards, control unit for automatic shift TCU judges whether have gearshift to ask in setting time t1, wherein t1>3s；
    Step 5, inoperative clutch is oil-filled：When step 4 judging result is in setting time t1 without gearshift request, to non-work Make clutch and carry out oil-filled, the oil-filled duration is t2, and t2<t1；
    Step 6：Pressure differential calculates：Pressure differential, which calculates, to be included the following steps：
    Step 61, oil-filled preceding pressure differential calculates：Before inoperative clutch is oil-filled, the working chamber of operative clutch is collected at this time Actual pressure value be P1, at this time, the order pressure of operative clutch and the mathematic interpolation of actual pressure are △ P11；
    Step 62, maximum pressure differential calculates in Oil feeding process：In inoperative clutch Oil feeding process, the working chamber of operative clutch The minimum value of the actual pressure collected at this time is P2, at this time, the order pressure of operative clutch and the maximum of actual pressure Mathematic interpolation is △ P12；
    Step 63, oil-filled front and rear maximum differential pressure calculates：Oil-filled front and rear, the pressure change maximum difference of operative clutch is denoted as △ P13, then △ P13=△ P12- △ P11；
    Step 7, filter failure judges：The △ P13 that step 63 calculates are sentenced compared with the pressure drop boundary condition P3 set It is disconnected；As △ P13>P3, and when △ P12 are more than 0, are then determined as filter failure, record 1 filter failure；
    Step 8, filter failure judges：Step 1- steps 7 are continuously circulated into n times, N >=3, if filter failure judges every time For failure when, then judge filter failure.
  2. 2. the detection method of double-clutch speed changer hydraulic system filter failure according to claim 1, it is characterised in that： In the step 2, the setting value T of gearbox oil temperature is 20 DEG C.
  3. 3. the detection method of double-clutch speed changer hydraulic system filter failure according to claim 1, it is characterised in that： In the step 4, the setting time t1 for request of shifting gears is 10s.
  4. 4. the detection method of double-clutch speed changer hydraulic system filter failure according to claim 1, it is characterised in that： In the step 7, pressure drop boundary condition P3=0.6bar of setting.
  5. 5. the detection method of double-clutch speed changer hydraulic system filter failure according to claim 1, it is characterised in that： In the step 8, by continuously circulation 5 times of step 1- steps 7, when it is failure that 5 filter failures, which judge, then filtering is judged Device fails.
CN201710049911.7A 2017-01-23 2017-01-23 A kind of detection method of double-clutch speed changer hydraulic system filter failure Active CN106762986B (en)

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CN110486349B (en) * 2019-07-26 2020-11-06 中国第一汽车股份有限公司 Filter failure detection method, hydraulic system, vehicle and storage medium
CN111288043B (en) * 2020-02-19 2022-09-30 中国第一汽车股份有限公司 Clutch execution piston clamping stagnation detection method and device

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US7373809B2 (en) * 2006-09-22 2008-05-20 General Motors Corporation Method for controlling a filter maintenance indicator
CN101608648B (en) * 2009-07-06 2011-04-06 三一重工股份有限公司 Method for acquiring characteristic parameters of displacement control mechanism of hydraulic pump and detection device
CN202040152U (en) * 2011-05-20 2011-11-16 长沙理工大学 Fault detection system of hydraulic system
CN104061208A (en) * 2014-07-02 2014-09-24 北京机械设备研究所 Online fault diagnosis method for hydraulic system
CN105697455B (en) * 2014-11-28 2018-05-11 上海汽车集团股份有限公司 The method that oil circuit monitoring is carried out to automotive transmission hydraulic system
CN105201960B (en) * 2015-09-08 2017-07-25 宁波亿控自动化科技有限公司 Double clutch electric ＆ hydraulic control module detecting device

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