GB2376997A - Clutch biting point monitoring system - Google Patents

Clutch biting point monitoring system Download PDF

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Publication number
GB2376997A
GB2376997A GB0115785A GB0115785A GB2376997A GB 2376997 A GB2376997 A GB 2376997A GB 0115785 A GB0115785 A GB 0115785A GB 0115785 A GB0115785 A GB 0115785A GB 2376997 A GB2376997 A GB 2376997A
Authority
GB
United Kingdom
Prior art keywords
clutch
biting point
monitoring system
cbp
point
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
GB0115785A
Other versions
GB2376997B (en
GB0115785D0 (en
Inventor
Peter John Bennett
Simon Rouven Perkins
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Ford Global Technologies LLC
Original Assignee
Ford Global Technologies LLC
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Ford Global Technologies LLC filed Critical Ford Global Technologies LLC
Priority to GB0115785A priority Critical patent/GB2376997B/en
Publication of GB0115785D0 publication Critical patent/GB0115785D0/en
Publication of GB2376997A publication Critical patent/GB2376997A/en
Application granted granted Critical
Publication of GB2376997B publication Critical patent/GB2376997B/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

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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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60W—CONJOINT CONTROL OF VEHICLE SUB-UNITS OF DIFFERENT TYPE OR DIFFERENT FUNCTION; CONTROL SYSTEMS SPECIALLY ADAPTED FOR HYBRID VEHICLES; ROAD VEHICLE DRIVE CONTROL SYSTEMS FOR PURPOSES NOT RELATED TO THE CONTROL OF A PARTICULAR SUB-UNIT
    • B60W2510/00—Input parameters relating to a particular sub-units
    • B60W2510/06—Combustion engines, Gas turbines
    • B60W2510/0638—Engine speed
    • B60W2510/0652—Speed change rate
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60W—CONJOINT CONTROL OF VEHICLE SUB-UNITS OF DIFFERENT TYPE OR DIFFERENT FUNCTION; CONTROL SYSTEMS SPECIALLY ADAPTED FOR HYBRID VEHICLES; ROAD VEHICLE DRIVE CONTROL SYSTEMS FOR PURPOSES NOT RELATED TO THE CONTROL OF A PARTICULAR SUB-UNIT
    • B60W2510/00—Input parameters relating to a particular sub-units
    • B60W2510/06—Combustion engines, Gas turbines
    • B60W2510/0657—Engine torque
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60W—CONJOINT CONTROL OF VEHICLE SUB-UNITS OF DIFFERENT TYPE OR DIFFERENT FUNCTION; CONTROL SYSTEMS SPECIALLY ADAPTED FOR HYBRID VEHICLES; ROAD VEHICLE DRIVE CONTROL SYSTEMS FOR PURPOSES NOT RELATED TO THE CONTROL OF A PARTICULAR SUB-UNIT
    • B60W2540/00—Input parameters relating to occupants
    • B60W2540/14—Clutch pedal position
    • 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
    • F16D2500/306—Signal inputs from the engine
    • F16D2500/3065—Torque of the engine
    • 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
    • F16D2500/306—Signal inputs from the engine
    • F16D2500/3067—Speed of the engine
    • F16D2500/3068—Speed change of rate of the engine
    • 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
    • F16D2500/314—Signal inputs from the user
    • F16D2500/31406—Signal inputs from the user input from pedals
    • F16D2500/31413—Clutch pedal position
    • 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
    • F16D2500/314—Signal inputs from the user
    • F16D2500/31406—Signal inputs from the user input from pedals
    • F16D2500/31413—Clutch pedal position
    • F16D2500/3142—Clutch pedal position rate
    • 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
    • F16D2500/50245—Calibration or recalibration of the clutch touch-point
    • 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
    • F16D2500/50245—Calibration or recalibration of the clutch touch-point
    • F16D2500/50266—Way of detection
    • F16D2500/50269—Engine speed
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • 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
    • F16D2500/50245—Calibration or recalibration of the clutch touch-point
    • F16D2500/50266—Way of detection
    • F16D2500/50281—Transmitted torque

Landscapes

  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Mechanical Engineering (AREA)
  • Hydraulic Clutches, Magnetic Clutches, Fluid Clutches, And Fluid Joints (AREA)

Abstract

A clutch biting point (CBP) monitoring system comprises an engine management electronic control unit which measures and/or estimates vehicle engine torque and acceleration. When the clutch is fully disengaged there is a direct relationship between the torque produced by the engine and its rotational acceleration, hence the clutch biting point is monitored by detecting, in a predetermined time period, a significant loss in the proportionality between measured engine torque and measured engine rotational acceleration. A clutch pedal sensor has means to determined the velocity of the clutch pedal as it moves towards the clutch biting point and is used to compensate for any delays between the clutch reaching the biting point and the time taken for the monitoring system to detect biting point.

Description

<Desc/Clms Page number 1>
CLUTCH PEDAL SENSOR The present invention relates to a vehicle clutch pedal operating position sensor. In particular, the present invention relates to a system and method for measuring the position of the clutch pedal when it is at the'biting point'.
With conventional vehicle manual clutch operation systems, a lever (assumed to be a foot pedal in the description infra) is operated to cause the clutch to move between a position of fully disengaged to fully engaged. As the lever is moved from the disengaged to the fully engaged position, the clutch plates will at some point start to transmit torque from the engine through to the transmission. This point is known as the'biting-point'of the clutch. The clutch biting point often varies both from vehicle to vehicle and with vehicle usage (i. e. temperature variation and wear/bedding in).
Any system that functions as a result of the clutch position relative to the biting point must therefore compensate for such variations.
To fit the manual gearbox or drive-shaft system with torque sensors would theoretically be a simple solution which would identify when the clutch is at biting point. However, with sensors manufactured under current production criteria this is not practical for volume vehicle manufacture due to the necessary sensor robustness and high cost. As an alternative, a clutch biting point monitoring system has been developed to infer the point at which torque is being transmitted through the clutch to the gearbox by using engine states measured/estimated by an engine management system control unit which is available on many car models and makes.
The clutch biting point monitoring system works on the following assumptions: Firstly, the engine management system is capable of measuring or estimating engine rotational speed, acceleration, temperature (normally coolant), and torque produced.
The techniques for measuring these parameters are known.
<Desc/Clms Page number 2>
When the clutch is fully disengaged there is a direct relationship between the torque produced by the engine and its rotational acceleration. This relationship is also a function of the free running engine inertia and any appropriate friction characteristics (typically varying with engine speed and temperature).
The theoretical relationship between acceleration and torque as follows :-
9 = T/ ! ,..
Wherein 6 is rotational acceleration, T is net torque and I is the inertia of the engine.
The inertia of the engine is a constant for any one vehicle and therefore the rotational acceleration can be considered proportional to the net torque. The net torque is equal to the torque produced by the engine minus the torque produced by the clutch. Hence, when the engine is unloaded, the torque produced by the clutch is zero and the rotational acceleration can be considered proportional to the torque produced by the engine.
When the clutch reaches the biting point the relationship defined supra is no longer valid as the additional load placed on the engine by the transmission and/or driveline and/or vehicle will result on reduced engine rotational acceleration for a given torque produced.
Accordingly, in one aspect, the invention provides a clutch biting point (CBP) monitoring system comprising an engine management electronic control unit for measuring and/or estimating vehicle engine torque and acceleration, wherein the CBP is monitored by detecting a significant loss in proportionality between measured engine torque and measured engine rotational acceleration.
It will be understood to a person skilled in the art that when the engine is unloaded, the torque produced by the clutch is zero and the rotational acceleration can be
<Desc/Clms Page number 3>
considered substantially proportional to the torque produced by the engine (see full description infra). However, slight variations may occur and therefore the loss in proportionality must be significant before engine loading is inferred.
Preferably, the loss in proportionality must be maintained for a minimum predetermined time before biting point is inferred.
For this assumption to be valid, the engine must be running in an error free condition. If errors have been detected then the engine management system may have some mechanism by which it establishes the validity of the critical criteria and notify the clutch biting point monitoring system accordingly.
Thus preferably, the system further comprises an error management system.
Once the clutch biting point is determined, this can be related to the clutch pedal position measured by a clutch pedal position sensor.
Therefore, the clutch biting point (CBP) monitoring system may further comprise a clutch pedal position sensor.
There will inevitably be some delay between the clutch reaching the biting point and the monitoring system detection depending upon the speed and accuracy at which the engine management system can measure/estimate the engine states and the amount by which the torque versus rotational acceleration must deviate from the free-running conditions before clutch biting can be inferred. Therefore it is necessary to determine the velocity (by differentiating clutch pedal position) at which the clutch pedal is moving when the biting point is identified so that either the system is only utilised for slow pedal velocities, thereby minimising errors produced as a result of the delay and/or the velocity is used to compensate for the delay.
Typically, the clutch biting point (CBP) monitoring system has means to determine the velocity of the clutch pedal as it moves towards the clutch biting point.
<Desc/Clms Page number 4>
In one embodiment, the clutch biting point (CBP) monitoring system is operational only at slow pedal velocities.
The skilled person will appreciate that as used herein, slow pedal velocities are defined as velocities at which the errors created by the speed and accuracy at which the engine management system can measure/estimate the engine states are acceptable.
By inference, fast velocities thus mean velocities at which the errors created by the speed and accuracy at which the engine management system can measure/estimate the engine states become unacceptable.
For example, the clutch biting point (CBP) monitoring system is operational only if the clutch pedal velocity as it approaches biting point is less than 50% and/or less than 40% and/or less than 30% and/or less than 20% of total displacement per second.
Alternatively, or in addition, the velocity of the clutch pedal as it reaches biting point is used to compensate for any delays between the clutch reaching biting point and the time taken for the monitoring system to detect biting point.
To account for any movement in clutch biting point over time or with wear, an adaptive strategy can be developed. This would re-calculate the estimated biting point so that the clutch pedal position sensor could derive the position of the clutch pedal relative to the biting point rather than its absolute position.
In another embodiment, the invention provides a vehicle control system comprising a clutch biting point (CBP) monitoring system as defined supra.
<Desc/Clms Page number 5>
In still a further aspect, the invention provides a vehicle comprising a clutch biting point (CBP) monitoring system as defined supra and/or a vehicle control system comprising a clutch biting point (CBP) monitoring system as defined supra.
The invention will now be described further with reference to the accompanying drawings, in which :Figure 1 shows the relationship between estimated engine torque and engine acceleration ; and Figure 2 shows the relationship between clutch pedal position and engine speed.
Referring now to the figures, Figure 1 shows the relationship between estimated engine torque 10 and engine acceleration 20 as the clutch reaches the biting point (65% at approximately 4 seconds). The graph illustrates that as soon as the clutch starts to bite the proportional relationship between torque and acceleration is no longer applicable, hence engine loading may be implied. The simultaneous relationship between clutch pedal position 130 and engine speed 140 is illustrated in Figure 2.
It will be understood that the present disclosure is for the purpose of illustration only and the invention extends to modifications, variations and improvements thereto.
The application of which this description and claims form part may be used as a basis for priority in respect of any subsequent application. The claims of such subsequent application may be directed to any feature or combination of features described therein. They may take the form of product, method or use claims and may include, by way of example and without limitation, one or more of the following claims :

Claims (13)

  1. Claims :- 1. A clutch biting point (CBP) monitoring system comprising an engine management electronic control unit for measuring and/or estimating vehicle engine torque and acceleration, wherein the CBP is monitored by detecting a significant loss in proportionality between measured engine torque and measured engine rotational acceleration.
  2. 2. A clutch biting point (CBP) monitoring system according to claim 1 wherein the loss in proportionality must be maintained for a minimum predetermined time before biting point is inferred.
  3. 3. A clutch biting point (CBP) monitoring system according to claim 1 or claim 2 further comprising a clutch pedal position sensor.
  4. 4. A clutch biting point (CBP) monitoring system according to any one of claims 1 to 3 having means to determine the velocity of the clutch pedal as it moves towards the clutch biting point.
  5. 5. A clutch biting point (CBP) monitoring system according to claim 4 operational only at slow pedal velocities.
  6. 6. A clutch biting point (CBP) monitoring system according to claim 5 operational only if the clutch pedal velocity as it approaches biting point is less than 50% and/or less than 40% and/or less than 30% and/or less than 20% of total displacement per second.
  7. 7. A clutch biting point (CBP) monitoring system according to claim 4 wherein the velocity of the clutch pedal as it reaches biting point is used to compensate for any delays between the clutch reaching biting point and the time taken for the monitoring system to detect biting point.
    <Desc/Clms Page number 7>
  8. 8. A clutch biting point (CBP) monitoring system according to any one of the preceding claims further comprising an error management system.
  9. 9. A clutch biting point (CBP) monitoring system substantially as described hereinabove.
  10. 10. A vehicle control system comprising a clutch biting point (CBP) monitoring system according to any one of the preceding claims.
  11. 11. A vehicle comprising a clutch biting point (CBP) monitoring system according to any one of claims 1 to 9 and/or a vehicle control system comprising a clutch biting point (CBP) monitoring system according to claim 10.
  12. 12. A method of monitoring the biting point of a vehicle clutch comprising the use of a clutch biting point (CBP) monitoring system according to any one of the preceding claims.
  13. 13. A method of monitoring the biting point of a vehicle clutch substantially as described hereinabove.
GB0115785A 2001-06-28 2001-06-28 Clutch biting point monitoring Expired - Fee Related GB2376997B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB0115785A GB2376997B (en) 2001-06-28 2001-06-28 Clutch biting point monitoring

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB0115785A GB2376997B (en) 2001-06-28 2001-06-28 Clutch biting point monitoring

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GB0115785D0 GB0115785D0 (en) 2001-08-22
GB2376997A true GB2376997A (en) 2002-12-31
GB2376997B GB2376997B (en) 2004-11-17

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Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2854216A1 (en) * 2003-04-22 2004-10-29 Valeo Embrayages Clutch friction lining wear diagnosing device for e.g. tourism vehicle, has measurement block with pressure sensor measuring effort on clutch pedal, and position sensor measuring effort variation as function of pedal position
WO2008028817A1 (en) * 2006-09-08 2008-03-13 Zf Friedrichshafen Ag Method for detecting the engagement point of a clutch, especially a wet starting clutch
WO2008028818A1 (en) * 2006-09-08 2008-03-13 Zf Friedrichshafen Ag Method for detecting the engagement point of a clutch, especially a wet starting clutch
DE102006029044B4 (en) * 2006-06-24 2009-12-10 Ford Global Technologies, LLC, Dearborn A method of assisting the launching of motor vehicles
EP2192319A1 (en) * 2008-12-01 2010-06-02 GM Global Technology Operations, Inc. Clutch system
DE102009000532A1 (en) 2009-02-02 2010-08-05 Ford Global Technologies, LLC, Dearborn Method and device for determining the coupling point in a motor vehicle

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH11241736A (en) * 1998-02-25 1999-09-07 Isuzu Motors Ltd Half clutch learning vehicle
US6022295A (en) * 1998-11-12 2000-02-08 Eaton Corporation Touch point identification for vehicle master clutch

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH11241736A (en) * 1998-02-25 1999-09-07 Isuzu Motors Ltd Half clutch learning vehicle
US6022295A (en) * 1998-11-12 2000-02-08 Eaton Corporation Touch point identification for vehicle master clutch

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2854216A1 (en) * 2003-04-22 2004-10-29 Valeo Embrayages Clutch friction lining wear diagnosing device for e.g. tourism vehicle, has measurement block with pressure sensor measuring effort on clutch pedal, and position sensor measuring effort variation as function of pedal position
WO2004094855A2 (en) * 2003-04-22 2004-11-04 Valeo Embrayages Device for identifying clutch friction lining wear
WO2004094855A3 (en) * 2003-04-22 2004-12-09 Valeo Embrayages Device for identifying clutch friction lining wear
DE102006029044B4 (en) * 2006-06-24 2009-12-10 Ford Global Technologies, LLC, Dearborn A method of assisting the launching of motor vehicles
WO2008028817A1 (en) * 2006-09-08 2008-03-13 Zf Friedrichshafen Ag Method for detecting the engagement point of a clutch, especially a wet starting clutch
WO2008028818A1 (en) * 2006-09-08 2008-03-13 Zf Friedrichshafen Ag Method for detecting the engagement point of a clutch, especially a wet starting clutch
EP2192319A1 (en) * 2008-12-01 2010-06-02 GM Global Technology Operations, Inc. Clutch system
WO2010063337A1 (en) * 2008-12-01 2010-06-10 Gm Global Technology Operations, Inc. Clutch system
DE102009000532A1 (en) 2009-02-02 2010-08-05 Ford Global Technologies, LLC, Dearborn Method and device for determining the coupling point in a motor vehicle

Also Published As

Publication number Publication date
GB2376997B (en) 2004-11-17
GB0115785D0 (en) 2001-08-22

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Effective date: 20100210

PCNP Patent ceased through non-payment of renewal fee

Effective date: 20200628