Wear monitoring device for friction clutch of motor vehicle

• Main Author: DREXL, HANS-JUERGEN
• Format: Patent
• Language: English; German
• Published: 16.09.1999
• Edition: 6
• Subjects: ARRANGEMENT OR MOUNTING OF PLURAL DIVERSE PRIME-MOVERS INVEHICLES; ARRANGEMENT OR MOUNTING OF PROPULSION UNITS OR OFTRANSMISSIONS IN VEHICLES; ARRANGEMENTS IN CONNECTION WITH COOLING, AIR INTAKE, GASEXHAUST OR FUEL SUPPLY OF PROPULSION UNITS, IN VEHICLES; AUXILIARY DRIVES FOR VEHICLES; BLASTING; BRAKES; CLUTCHES; CONJOINT CONTROL OF VEHICLE SUB-UNITS OF DIFFERENT TYPE ORDIFFERENT FUNCTION; CONTROL SYSTEMS SPECIALLY ADAPTED FOR HYBRID VEHICLES; COUPLINGS FOR TRANSMITTING ROTATION; ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVEFUNCTIONING OF MACHINES OR INSTALLATIONS; HEATING; INSTRUMENTATION OR DASHBOARDS FOR VEHICLES; INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIRCHEMICAL OR PHYSICAL PROPERTIES; LIGHTING; MEASURING; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS; MEASURING LENGTH, THICKNESS OR SIMILAR LINEARDIMENSIONS; MECHANICAL ENGINEERING; PERFORMING OPERATIONS; PHYSICS; ROAD VEHICLE DRIVE CONTROL SYSTEMS FOR PURPOSES NOT RELATED TOTHE CONTROL OF A PARTICULAR SUB-UNIT; TESTING; TESTING STATIC OR DYNAMIC BALANCE OF MACHINES ORSTRUCTURES; TESTING STRUCTURES OR APPARATUS NOT OTHERWISE PROVIDED FOR; THERMAL INSULATION IN GENERAL; TRANSPORTING; VEHICLES IN GENERAL; WEAPONS

The arrangement has a wear detection unit (16b) which receives information from a tachometer (3b) indicative of the instantaneous speed of the friction clutch, from which it determines the load on the clutch at the time of starting-off as a predetermined monotonic decreasing function of a value of the speed information or of a number of values of the speed information following each other. The wear detection unit also receives speed information representing of the vehicle travel speed from a sensor (5b). Upon receiving information from the sensor indicative of the vehicle starting-off information, the wear detection unit determines the load on the friction clutch at the time of the starting-off operation by evaluating a number of values of the speed information from the tachometer following each other within a time period of predetermined length after the beginning of the starting-off operation. The arrangement may also include a memory to store which stores information regarding a number of starting-off operations and which can be accessed at a later date to enable analysis to be carried out on the stored information. A dashboard mounted indicator with a digital readout can be provided that displays a value of the load on the clutch to the driver until the next starting-off operation. Es wird eine Anordnung zur Überwachung des Verschleißzustands einer Reibungskupplung im Antriebsstrang eines von einem Verbrennungsmotor angetriebenen Kraftfahrzeugs vorgeschlagen, welche eine Verschleißerfassungsschaltung (1b) umfaßt, die auf eine von einem ersten Drehzahlgeber (3b) gelieferte, die momentane Eingangsdrehzahl der Reibungskupplung repräsentierende Drehzahlinformation und eine von einem Bewegungssensor (5b) gelieferte, den Beginn eines Anfahrvorgangs repräsentierende Information anspricht und als Maß für die Belastung der Reibungskupplung bei einem Anfahrvorgang eine Belastungsinformation liefert, die eine vorbestimmte monotone Funktion eines dem Bewegungsbeginn in einem vorbestimmten zeitlichen Abstand folgenden Werts der ersten Drehzahlinformation oder eines Mittelwerts aus einer Mehrzahl von nach dem Bewegungsbeginn in vorbestimmten zeitlichen Abständen aufeinanderfolgenden Werten der ersten Drehzahlinformation ist.