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
  • F16D2500/30—Signal inputs
  • F16D2500/302—Signal inputs from the actuator
  • F16D2500/3026—Stroke
• • 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
  • F16D2500/50275—Estimation of the displacement of the clutch touch-point due to the modification of relevant parameters, e.g. temperature, wear
• • 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
  • F16D2500/70205—Clutch actuator
  • F16D2500/70211—Force

Definitions

• the invention relates to a method for referencing a zero point of a self-closing clutch in a motor vehicle, in which a clutch actuator is actuated, which is moved against a stop, wherein the clutch actuator has an Aktorkraftkennline.
• a reference position of an actuator wherein the actuator displaces an actuating element along an actuation path and the reference position is determined on a mechanical stop at one end of the actuation path.
• a reference position is considered to be plausible only if a force development of an energy store upstream of the mechanical stop along the actuating path can be assigned to a predetermined plausibility position assigned to the reference position.
• Referencing stop is not an obstacle in the transmission line at which the clutch actuator inadvertently carries out the zeroing. It is referenced in the first stage against a preloaded spring and should the found zero be implausible, the preloaded spring is further clamped and against a pressed mechanical stop. This mechanical stop then represents the plausibility checkpoint.
• the path difference between the plausibility checkpoint and the referenced zero point is structurally predetermined, as a result of which the referencing point can be clearly identified in its distance to the plausibility checkpoint.
• Coupling actuator to move (Fig. 7 and 8).
• the clutch actuator moves away from the tongues of the disk spring of the clutch and, when the referencing or plausibility check has been made, re-engages the tongues of the disk spring of the clutch.
• the lifting and re-impact of the actuator mechanism on the release bearing or the tongues of the plate spring of the coupling has a negative effect on the life of the clutch actuation system. At the same time, it also affects the acoustics.
• the invention is therefore based on the object to provide a method for referencing a zero point of a self-closing clutch in a motor vehicle, in which the life of the clutch actuation system is extended.
• the object is achieved in that the referencing takes place on the stop when the clutch is open, wherein the stopper has a greater rigidity than the Aktorkraftkennline the clutch actuator.
• Plausibility check of the referenced zero point if preferably a path difference
• a path difference between the currently referenced zero point and a plausibility check point is determined, which is compared with a given plausibility check path and if the path difference and the given plausibility check path match, the accuracy is correct of the referenced zero point is closed.
• This procedure can be used both in a clutch actuator with a mechanical as well as a hydraulic transmission path, if thereby a self-closing clutch (normally closed clutch) is actuated.
• the plausibility check is carried out when the clutch is closed.
• the clutch actuator moves in the opposite direction for referencing. It is a standby point of the clutch actuator, which represents a point in the clutch characteristic, where the clutch is closed and the release force is at a minimum preload for the release bearing overrun.
• the release bearing lifts off from the tongues of the disc spring or a release lever from an actuator linkage.
• the clutch actuator moves in this direction until the stop is reached with the given stiffness characteristic.
• This procedure can be used both for a clutch actuator with a mechanical transmission path and for a clutch actuator with an electro-hydraulic transmission path.
• the plausibility check is carried out with a closed clutch against a two-stage stop.
• the path difference between the referenced zero point, which was determined in the state clutch open, and the plausibility check, which was determined in a closed clutch, is evaluated.
• the two mechanical stops used in this case have a significantly greater rigidity than the coupling force characteristic, whereby this procedure is also applicable to clutch actuators with a mechanical or hydraulic transmission path.
• the path difference between the zero point referenced when the clutch is open and a plausibility check when the clutch is closed is determined. It can be a two-stage stop for the
• a two-stage plausibility curve is used, and the clutch actuator moved against a prestressed spring and referenced and then further biased the biased spring by the clutch actuator and pressed against a mechanical stop for plausibility, wherein for plausibility of the referenced zero point, the path difference between referenced Zero point and plausibility point is determined.
• a pressure spring characteristic is necessary, which can be assigned to a compression spring, which is positioned between the clutch actuator and Aktorgestfite.
• the plausibility of the referenced zero point takes place when the clutch is open. As in this embodiment, not only the
• FIG. 6 shows a third exemplary embodiment of the method according to the invention
• FIG. 7 shows a method for referencing and plausibility checking according to the prior art for a mechanical transmission path of the clutch actuation system
• Fig. 1 shows a section of a clutch actuation system 1, as used in motor vehicles with automatically closing clutches.
• the clutch 2 is actuated by adjacent to this plate springs, the tongues 3 rest against the release bearing 4.
• the release bearing 4 presses on a release lever 5, which is in operative connection with a release link 6 of the clutch actuator 7.
• a compression spring 8 is in this case positioned between the clutch actuator 7 and the actuator rod 6.
• the referencing of the zero point of the Kupplungsaktors7 takes place with the clutch open.
• the clutch actuator 7 is driven against a stop which in the clutch actuator 7 itself or in the transmission Coupling actuator 7 - release lever 5 - release bearing 4 - clutch 2 is arranged.
• the arrangement of the stop is variable.
• the decisive factor is that the stop has a significantly greater rigidity than the actuator force characteristic of the
• FIG. 2 shows a first exemplary embodiment for referencing or plausibility checking of a mechanical clutch actuation system 1, which is used primarily in clutch-by-wire systems.
• the clutch actuator 7 When the clutch 2 is open, the clutch actuator 7 is referenced against a mechanical stop to set the zero point for the further control of the clutch actuator 7. In order to make the referenced zero point plausible, the clutch actuator 7 travels in the opposite direction after referencing, i. that the clutch 2 is closed. If a standby point BP is run over, the release bearing 4 lifts off from the tongues 3 of the disc spring or the release lever 5 releases the actuator rod 6.
• Clutch actuator 7 moves in this predetermined direction until the mechanical stop is reached with the given stiffness characteristic.
• a plausibility check of the referenced zero point is performed by the clutch actuator 7 is moved against the prestressed compression spring 8. As a result, the clutch 2 is closed. Subsequently, the compression spring 8 is further compressed by the clutch actuator 7 and continued until the actual mechanical stop on the Aktorgestlinde 6. The plausibility point of the clutch actuator 7 results from this.
• the path difference between the referencing point and the plausibility checkpoint is compared with a plausibility check path, which is predetermined by design, and closed if it matches a correctly determined zero point.
• FIG. 3 In addition to the referencing and plausibility check methods for mechanical clutch actuation systems 1, the method just explained is illustrated in FIG. 3 for a hydraulic clutch actuation system 1.
• the standby point BP corresponds to the point where the volume compensation of the hydraulic line also takes place. Therefore, only a standby point BP is marked here, since there is always a pressure equalization in the hydraulic transmission path.
• the referencing of the zero Point of the clutch actuator 7 with the clutch 2 open, while the plausibility is verified with the plausibility curve of the compression spring 8 with the clutch 2 closed.
• FIG. 5 shows the second exemplary embodiment of the referencing method and the plausibility method for clutch actuation system 1 with a hydraulic transmission path. Also in this case, the compression spring 8 and thus the pressure spring characteristic is dispensed with. Referencing takes place with the clutch open against a first stop, while the plausibility check with the clutch is closed against a second stop. In the characteristic actuator force over the Aktorweg the new condition of the clutch 2 equal to the state of wear of the clutch second
• FIG. 6 A further exemplary embodiment of the method according to the invention is shown in FIG. 6, in which both the referencing stop and the plausibility stop are approached with the clutch 2 open, whereby the release bearing 4 is lifted off to the tongues 3 of the disk spring or the release lever 5 is lifted off Release bearing 4 or lifting the Aktorgestfites 6 to the release lever 5 is no longer done.
• This variant is suitable both for the mechanical and the hydraulic transmission path of the clutch actuation system 1.
• the two-stage capability of the plausibility check characteristic of the compression spring 8, as explained in FIGS. 2 and 3, is used again.
• the advantage that it can not come to the plausibility of lifting off for example, the release bearing 4 to the tongues 3 of the plate spring.

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• 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)
• Mechanical Operated Clutches (AREA)
• Power-Operated Mechanisms For Wings (AREA)

Priority Applications (2)

Applications Claiming Priority (4)

Publications (2)

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ID=52946201

Family Applications (1)

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Cited By (2)

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Citations (1)

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• 2015
  • 2015-03-19 WO PCT/DE2015/200180 patent/WO2015149793A2/de active Application Filing
  • 2015-03-19 DE DE112015001641.4T patent/DE112015001641A5/de active Pending
  • 2015-03-19 CN CN201580017277.8A patent/CN106133375B/zh active Active

Patent Citations (1)

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