CN105980727A - Determining a coefficient of friction for a friction clutch - Google Patents

Determining a coefficient of friction for a friction clutch Download PDF

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Publication number
CN105980727A
CN105980727A CN201480074332.2A CN201480074332A CN105980727A CN 105980727 A CN105980727 A CN 105980727A CN 201480074332 A CN201480074332 A CN 201480074332A CN 105980727 A CN105980727 A CN 105980727A
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CN
China
Prior art keywords
friction
friction clutch
clutch
coefficient
rotating speed
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Granted
Application number
CN201480074332.2A
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Chinese (zh)
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CN105980727B (en
Inventor
巴沙尔·易卜拉欣
格哈德·赫德鲁斯
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Schaeffler Technologies AG and Co KG
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Schaeffler Technologies AG and Co KG
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Classifications

    • 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
    • F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
    • F16D48/00—External control of clutches
    • F16D48/06—Control by electric or electronic means, e.g. of fluid pressure
    • 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
    • F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
    • F16D2500/00—External control of clutches by electric or electronic means
    • 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
    • F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
    • F16D2500/00—External control of clutches by electric or electronic means
    • F16D2500/10—System to be controlled
    • F16D2500/104—Clutch
    • F16D2500/10443—Clutch type
    • F16D2500/1045—Friction clutch
    • 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
    • F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
    • F16D2500/00—External control of clutches by electric or electronic means
    • F16D2500/30—Signal inputs
    • F16D2500/304—Signal inputs from the clutch
    • F16D2500/30402—Clutch friction coefficient
    • 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
    • F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
    • F16D2500/00—External control of clutches by electric or electronic means
    • F16D2500/30—Signal inputs
    • F16D2500/304—Signal inputs from the clutch
    • F16D2500/30404—Clutch temperature
    • 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
    • F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
    • F16D2500/00—External control of clutches by electric or electronic means
    • F16D2500/30—Signal inputs
    • F16D2500/304—Signal inputs from the clutch
    • F16D2500/3041—Signal inputs from the clutch from the input shaft
    • F16D2500/30415—Speed of the input shaft
    • 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
    • F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
    • F16D2500/00—External control of clutches by electric or electronic means
    • F16D2500/30—Signal inputs
    • F16D2500/304—Signal inputs from the clutch
    • F16D2500/3042—Signal inputs from the clutch from the output shaft
    • F16D2500/30426—Speed of the output shaft
    • 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
    • F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
    • F16D2500/00—External control of clutches by electric or electronic means
    • F16D2500/30—Signal inputs
    • F16D2500/305—Signal inputs from the clutch cooling
    • F16D2500/3055—Cooling oil properties
    • F16D2500/3056—Cooling oil temperature
    • 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
    • F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
    • F16D2500/00—External control of clutches by electric or electronic means
    • F16D2500/30—Signal inputs
    • F16D2500/312—External to the vehicle
    • F16D2500/3121—Ambient conditions, e.g. air humidity, air temperature, ambient pressure
    • 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
    • F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
    • F16D2500/00—External control of clutches by electric or electronic means
    • F16D2500/30—Signal inputs
    • F16D2500/316—Other signal inputs not covered by the groups above
    • F16D2500/3166—Detection of an elapsed period of time
    • 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
    • F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
    • F16D2500/00—External control of clutches by electric or electronic means
    • F16D2500/50—Problem to be solved by the control system
    • F16D2500/502—Relating the clutch
    • F16D2500/50236—Adaptations of the clutch characteristics, e.g. curve clutch capacity torque - clutch actuator displacement
    • 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
    • F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
    • F16D2500/00—External control of clutches by electric or electronic means
    • F16D2500/70—Details about the implementation of the control system
    • F16D2500/702—Look-up tables
    • 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
    • F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
    • F16D2500/00—External control of clutches by electric or electronic means
    • F16D2500/70—Details about the implementation of the control system
    • F16D2500/702—Look-up tables
    • F16D2500/70252—Clutch torque
    • F16D2500/70282—Time
    • 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
    • F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
    • F16D2500/00—External control of clutches by electric or electronic means
    • F16D2500/70—Details about the implementation of the control system
    • F16D2500/706—Strategy of control
    • F16D2500/70642—Inverse model

Abstract

A method for determining a change in a coefficient of friction (335) for a fully released friction clutch (120) in a drive train of a motor vehicle comprises steps for determining (225) a period (425) during which the friction clutch was released, determining (230) a rotational speed (430) of the friction clutch, and determining (235) the change in the coefficient of friction (335) on the basis of the period (425) and the rotational speed (430), the change in the coefficient of friction (335) being determined by means of a characteristic field (315).

Description

The coefficient of friction of friction clutch determines
Technical field
The present invention relates to the determination of the coefficient of friction of friction clutch.Especially, the present invention relates to The coefficient of friction of the friction clutch in the PWTN of motor vehicles determines.
Background technology
Motor vehicles include the PWTN with dual-clutch transmission, described double clutch Variator couples with driving motor by means of double clutch.Dual-clutch transmission is generally hung Enter to have two different gears, but wherein the most only in friction clutch is Guan Bi And between internal combustion engine and variator, transmit moment of torsion.During shifting gears, the friction clutch of Guan Bi Device disconnects and another friction clutch closes simultaneously.In order to realize comfortable and effectively Gearshift, need to accurately control multiple clutch parameters of friction clutch.These parameters are outstanding It can include contact, coefficient of friction, form factor and delayed.These parameters generally by means of Observation Blocks is assessed and considers measured and between the value calculated anticipated error, To continue to correct parameter to be monitored adaptively.It is then able to improvement based on described parameter Control gearshift.
DE 10 2,010 024 941 A1 illustrates that friction clutch is on dual-clutch transmission The determination of contact.
Because via the friction clutch not transfer of torque disconnected, so not can determine disconnection Friction clutch on all parameters.Generally, also the following is starting point: at friction clutch It is fully disconnected and transmits during moment of torsion not via friction clutch, such as friction clutch Or the coefficient of friction of clutch facing keeps constant.It has proven convenient that this imagination is not at all shapes It is all effective under condition.If friction clutch was such as off within the longer time period, So coefficient of friction of friction clutch can change.If coefficient of friction reduces, then At the end of the inoperative stage, when gearshift, high or long friction clutch can occur Device skids.If coefficient of friction increased during the inoperative stage, then changing subsequently Gear there will be the too early of friction clutch or attachment immediately.Both phenomenons all can be led Cause seriously to damage driving comfort.
Summary of the invention
Therefore it is an object of the invention to, propose a kind of for determining the friction clutch being fully disconnected The method of the coefficient of friction change of device.The present invention is by means of the feature with independent claims Method realizes this purpose.Dependent claims describes preferred embodiment.
The most disconnected for determine in the PWTN of motor vehicles according to the present invention The method of the coefficient of friction change of the friction clutch opened includes the steps of determining that the time period, During the described time period, friction clutch disconnects；Determine rotating speed and the root of friction clutch Determining that coefficient of friction changes according to time period and rotating speed, wherein coefficient of friction change is bent by means of feature Line race determines.
By the coefficient of friction changed of the friction clutch that consideration is fully disconnected, it is possible to essence Really control friction clutch engaging process after the inoperative time period.It is possible to Engage in the way of protection material, enabling extend the service life of friction clutch. Motor vehicles can move with higher driving comfort.Feature based family of curves can quickly and Error performs the determination of coefficient of friction change less.Characteristic family can only need a small amount of place Reason resource.Here, the data of characteristic family can determine by means of assay device, described examination Experiment device provides the result of coupling for multiple friction clutches or PWTN.
Can additionally determine the open gap of friction clutch, the most additionally based on disconnecting between Gap determines that coefficient of friction changes.Here, the output valve of characteristic family preferably with constant because of Several or predetermined function is multiplied.The temperature of friction clutch is regulated by the size of open gap to be had Impact.Open gap is the biggest, and friction clutch is the most more quickly matched with ambient temperature.Therefore can Enough determine the precision that coefficient of friction changes with improvement.
In another embodiment, it is also determined that the temperature of friction clutch, the most additionally based on Temperature determines that coefficient of friction changes.With with above for described in open gap Similar mode, preferably by the output valve of characteristic family and constant factor or predetermined letter Number is multiplied, in order to adjust temperature impact.It also is able to improvement by this measure and carries out coefficient of friction The precision that change determines.
In one embodiment, friction clutch works in air ambient, and in order to really Fixed temperature considers the specific heat capacity of air.It also is able to consider thermal mass and/or the capacity of heat transmission of pressing plate. Furthermore it is possible to consider other characteristic of air, such as, carry out the sky of heat exchange with friction clutch Air volume or air themperature.
Friction clutch also is able to work in oil environment, wherein considers the specific heat capacity of oil.Here, It is referred to as wet friction clutch.Here, also be able to consider the additional parameter of oil, such as oil body Amass or oil temperature.
Preferably, PWTN includes that double clutch, described double clutch have and is fully disconnected Friction clutch and another Guan Bi friction clutch.Here, friction clutch is designed for Transfer of torque between common power shaft and different transmission shafts.
The most such as can monitor or control the double clutches for dual-clutch transmission with improvement Device.
Accompanying drawing explanation
It is more fully described the present invention, wherein referring now to appended accompanying drawing:
Fig. 1 illustrates a part for the PWTN for motor vehicles；
Fig. 2 illustrates the method for the coefficient of friction change for determining the friction clutch being fully disconnected Flow chart；
Fig. 3 illustrates the simplification view determining that coefficient of friction changes；
Fig. 4 illustrates for setting up for according to the characteristic family used in the method for Fig. 2 The flow chart of method；
Fig. 5 illustrates the clutch characteristic curve of the friction clutch of Fig. 1；And
Fig. 6 illustrates the characteristic family of the method according to Fig. 4.
Detailed description of the invention
PWTN that Fig. 1 illustrates PWTN 100, that be particularly useful for motor vehicles A part.PWTN 100 includes driving motor 105, double clutch 110 and double clutch Device variator 115.Double clutch 110 include the first friction clutch 120 and the second friction from Clutch 125.The two friction clutch 120,125 is connected with identical power shaft 130. But the first friction clutch 120 is in the first speed change of outlet side Yu dual-clutch transmission 115 Device axle 135 connects, and the second friction clutch 125 and the second of dual-clutch transmission 115 Transmission shaft 140 connects.Illustratively, the first transmission shaft 135 is linked into the first gear 145 and on the second transmission shaft 140, be linked into the second gear 150.The two gear 140, 145 pairs of common output shafts 155 work, and described output shaft such as can be with motor vehicles Driving wheel connects.
Friction clutch 120 and 125 can be dry type and work in air ambient or It is wet type and works in oil environment.In shown PWTN 100 the most only In friction clutch 120,125 one is Guan Bi, and another is fully disconnected. The gear that so friction clutch 120,125 with Guan Bi is connected works, and another Gear is inoperative.When gearshift, the friction clutch 120,125 of Guan Bi is disconnected And another friction clutch 125,120 is closed.In this transition period, the two friction Clutch 120,125 can simultaneously partially close.
In order to control gearshift or friction clutch 120,125, it is provided with control device 160.Control Device 160 is especially connected with executor's (not shown), described executor be capable of rub from Being opened or closed of clutch 120,125.Can also pass with other additionally, control device 160 Sensor, especially rotating speed or temperature sensor and/or other executor are such as used for being linked into or de- Executor from gear 145,150 connects.
Friction clutch 120,125 Guan Bi in order to realize will be switched off makes to treat by friction clutch Device 120,125 transmission moment of torsion improve the most in a desired manner, in addition it should be understood that The coefficient of friction of friction clutch 120,125.Moment of torsion not via friction clutch 120, During 125 transmission, the coefficient of friction of friction clutch 120,125 can change.Right Consideration in subsequently is not necessarily required to exist more than one friction in PWTN 100 Clutch 120,125, but the generation on a friction clutch 120,125 disconnected The problem of the coefficient of friction of change particularly occurs on double clutch 110, and moment of torsion is via accordingly Another friction clutch 120,125 transmit.
Fig. 2 illustrates the described coefficient of friction change for determining the friction clutch being fully disconnected The flow chart of method 200.The power in this is with reference to Fig. 1 in the case of without loss of generality Friction clutch 120 in power train 100.
In first step 205, friction clutch 120 is off.Generally, this pair of clutch Another friction clutch 125 of device 110 completely or at least partially closes.In step In 210, determine the temperature of friction clutch 120.Such as can break at friction clutch 120 Before opening or period determines temperature based on friction clutch model.In step 215, determine And store the rotating speed of friction clutch 120.Described storage forms the average of rotating speed for afterwards Value；In other embodiments, by only considering the recent rotating speed of predetermined quantity or can divide Rotating speed determined by the most only considering finally, it is also possible to form moving average (gleitender Durchschnitt)。
Check whether in a step 220 to need via friction clutch 120 transfer of torque.This is right Should be in the demand of gearshift.If not via friction clutch 120 transfer of torque, then described side Method 200 returns step 215 and re-executes.Can experience predetermined before re-executing Waiting time.
When there is the demand to transfer of torque, it is defined below the time period in step 225, During the described time period, friction clutch 120 is off.To this end, such as it can be considered that deposited The quantity of the tachometer value of storage.If inserting the constant waiting time when rebound, then time described Between section can correspond to inserted waiting time and the product of the quantity of rotating speed stored.
In step 230, preferably from the rotating speed stored, mean speed is determined.As an alternative, It also is able to the rotating speed using moving average or the rotating speed finally determined.In this step 235, Determine the friction system of friction clutch 120 based on rotating speed and time period by means of characteristic family Number change.The determination of characteristic family is more fully described with reference to Fig. 4.Preferably, in step Also defeated by the correction factor of temperature based on friction clutch 120 and characteristic family in 240 Go out value to be multiplied.Here, the temperature of step 210 is preferably used, described temperature is directly disconnected Determine after driving friction clutch 120.It is furthermore preferred that in following step 245 Determine the open gap of friction clutch 120.Open gap is corresponding to friction clutch 120 Friction plate spacing to each other and can be based on the executor position for friction clutch 120 Put and determine with contact, start via friction clutch transfer of torque at described contact.In step The correction factor being subsequently used for open gap in rapid 250 is applied to the output of characteristic family Value or corrected output valve.Correction factor and temperature for open gap naturally also can Apply in reverse order.
In optional step 255, make friction clutch based on the change of so provided coefficient of friction Device 120 closes.The coefficient of friction changed by consideration can perform to close with the precision improved Conjunction process, especially when another friction clutch 125 simultaneously switched off in PWTN 100 Time.
Fig. 3 illustrates that the method according to Fig. 2 determines the simplification view that coefficient of friction changes.Rub from The rotating speed 305 of clutch 120 and time period 310 friction clutch during the described time period 120 have disconnected the input value being used as the characteristic family 315 for two dimension.Feature is bent The output valve 320 of line race 315 be multiplied with the correction factor 325 for temperature and subsequently with Correction factor 330 in the open gap of friction clutch 120 is multiplied.The two is corrected For factor 325,330 preferably, its be respectively and input value, i.e. temperature or disconnect between The factor of gap linear correlation.If desired, it is also possible to select than the most more complicated relation.These are two years old The application of individual correction factor 325 and 330 is optionally and order is to exchange.Subsequently, Thering is provided coefficient of friction change 335, the change of described coefficient of friction is the friction of friction clutch 120 Coefficient with before described method 200, the most directly disconnect friction clutch The deviation of the coefficient of friction determined before 120.
Fig. 4 illustrates the flow chart of the exemplary method 400 for determining characteristic family 315. Here, the device that be similar to Fig. 1 is preferably used, wherein power shaft 130 can be by means of driving Motor loads predetermined moment of torsion, and two transmission shafts 135,140 can be independently of each other Braked by predetermined moment of torsion.Preferably, axle 130,135 and 140 dispose rotating speed pass Sensor and with control device be connected.
In first step 405, determine first clutch characteristic curve.Clutch characteristic curve It is given at the manipulation of clutch 120, i.e. control run, and the torsion being transmitted corresponding thereto Relation between square, wherein the fricting clutch plate of friction clutch 120 is with described control run The most close to each other.Exemplary first clutch characteristic curve 505 is in following Fig. 5 Draw.
In following step 410, introduce predetermined energy alternatively.Here, preferred portion Ground is divided to disconnect friction clutch 120 to produce predetermined skidding and predetermined rotating speed, and another One friction clutch 125 transfer of torque in the case of non-slip.On friction clutch 120 The frictional energy of release produces heat so that the temperature of friction clutch 120 raises.By predetermined Energy introduce can realize desired temperature raise.It also is able to as an alternative at friction clutch Temperature is detected at 120.
At step 420, friction clutch 120 be off and be in inoperative rank Duan Zhong.The time period 425 in inoperative stage can at random be controlled, wherein in order to keep away Exempt from measurement error and should be not less than predetermined time period 425.During the inoperative stage 420 The rotating speed 430 of friction clutch 120 is changed by correspondingly changing the rotating speed of power shaft 130. In order to obtain reproducible result, it is preferred that be linked into predetermined at the first transmission shaft 135 Gear 145.It is furthermore possible to during the inoperative stage 420 change open gap 435.
At the end of the inoperative stage 420, determine second clutch characteristic curve 510, Described second clutch characteristic curve figure 5 illustrates equally.Clutch characteristic curve 505 He The determination of 510 in known manner by friction clutch 120 be gradually turned off or close into OK, and now another friction clutch 125 is Guan Bi.Preferably, determining that clutch is special During levying curve 505,510, the rotating speed of power shaft 130 is maintained in predetermined level.
In step 445, friction is determined based on specific clutch characteristic curve 505 and 510 Index variation.
More than 400 traversal of described method, wherein changes parameter between traversal the most accordingly 415, in 425,430 and 435 so that when traversal every time parameter 415,425, The new combination of 430 and 435 is applicable.Preferably, the time period 425 is the most systematically changed And/or rotating speed 430, in order to characteristic family 315 is provided.Subsequently, it is possible to change temperature 415 And/or open gap 435, in order to determine correction factor 325 or 330.
So provided parameter is preferred for performing described method on PWTN 100 200。
Fig. 6 illustrates exemplary characteristic family 315, in order to based on time period 425 and rotating speed 430 determine coefficient of friction change 335 by means of the method 200 in Fig. 2.
Reference numerals list
100 PWTNs
105 drive motor
110 double clutches
115 dual-clutch transmissions
120 first friction clutches
125 second friction clutches
130 power shafts
135 first transmission shafts
140 second transmission shafts
145 first gears
150 second gears
155 output shafts
160 control device
200 methods
205 disconnect friction clutch
210 determine temperature
215 determine and store rotating speed
220 transmit moment of torsion the need of friction clutch？
225 determine the time period, and during the described time period, friction clutch disconnects
230 determine mean speed
By means of characteristic family, 235 determine that coefficient of friction changes
240 application are for the correction factor of temperature
245 determine open gap
250 application are for the correction factor of open gap
255 Guan Bi friction clutches
305 rotating speeds
310 time periods
315 characteristic families
320 output valves
The correction factor of 325 temperature
The correction factor of 330 open gap
335 coefficient of friction changes
400 methods
405 determine first clutch characteristic curve
410 introduce predetermined energy
415 temperature
420 inoperative stages
425 time periods
430 rotating speeds
435 open gap
440 determine second clutch characteristic curve
445 determine that coefficient of friction changes
505 first clutch characteristic curves
510 second clutch characteristic curves

Claims (7)

1. the coefficient of friction change being used for determining the friction clutch (120) being fully disconnected (335) method (200), described friction clutch is for the PWTN (100) of motor vehicles In, wherein said method (200) comprises the steps:
-determine (225) time period (425), during the described time period, described friction clutch Device (120) disconnects；
-determine the rotating speed (430) of (230) described friction clutch (120)；
-determine according to described time period (425) and described rotating speed (430) and to rub described in (235) Wipe index variation (335),
-wherein determine that described coefficient of friction changes (335) by means of characteristic family (315).
Method the most according to claim 1 (200), comprises determining that (245) institute in addition State the open gap (435) of friction clutch (120), the most additionally based on described disconnection between Gap (435) determines that described coefficient of friction changes (335).
Method the most according to claim 1 and 2 (200), comprises determining that (210) in addition The temperature (415) of described friction clutch (120), the most additionally based on described temperature (415) Determine that described coefficient of friction changes (335).
Method the most according to claim 3 (200), wherein said friction clutch (120) Air ambient works and considers the specific heat capacity of air.
Method the most according to claim 3 (200), wherein said friction clutch (120) Oil environment works and considers oily specific heat capacity.
6. according to the method (200) according to any one of the claims, wherein based on described The meansigma methods of period rotating speed time period (425) (430) determines (230) described rotating speed (430).
7., according to the method (200) according to any one of the claims, wherein said power passes Dynamic system (100) includes double clutch (110), and described double clutch has the friction being fully disconnected Clutch (120) and the friction clutch (125) of another Guan Bi, and described friction clutch (120,125) be designed for common power shaft (130) and different transmission shaft (135, 140) transfer of torque between.
CN201480074332.2A 2014-01-29 2014-12-15 The coefficient of friction of friction clutch determines Active CN105980727B (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE102014201553.7 2014-01-29
DE102014201553 2014-01-29
PCT/DE2014/200712 WO2015113538A1 (en) 2014-01-29 2014-12-15 Determining a coefficient of friction for a friction clutch

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CN105980727A true CN105980727A (en) 2016-09-28
CN105980727B CN105980727B (en) 2018-05-22

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DE (1) DE112014006294A5 (en)
WO (1) WO2015113538A1 (en)

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CN106763285A (en) * 2016-12-27 2017-05-31 湘潭大学 The control device and control method of multi-disc wet clutch coefficient of friction compensating for loss and damage
CN109312793A (en) * 2016-06-07 2019-02-05 奥迪股份公司 Vehicle and method for running the clutch as initiating element
CN114245855A (en) * 2019-09-20 2022-03-25 株式会社小松制作所 Transmission system for work machine, and method for predicting life of transmission system in work machine

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Publication number Priority date Publication date Assignee Title
DE102016209536B4 (en) 2016-06-01 2022-12-01 Ford Global Technologies, Llc Method and device for estimating the coefficient of friction of a clutch

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