Patent ID: 6117048
Filing Date: 2000-09-12
Classification: F16D,F16H,Y10T

Abstract:
An apparatus for determining abrasion of a clutch of a transmission which includes plural gear clutches, hydraulic operation pistons for receiving pressurized oil from a hydraulic pump through clutch hydraulic control valves to engage with these gear clutches, clutch piston chambers for receiving pressurized oil pressing these hydraulic operation pistons, and control means for selecting a gear by a depression quantity of an acceleration pedal and a signal from a vehicle speed sensor and for outputting a change over instruction to a selected clutch hydraulic control valve, said apparatus comprising:a pressure sensor for measuring a pressure in a clutch piston chamber; andclutch abrasion detection means for storing a relation between a time T, when a respective clutch piston chamber is filled with pressurized oil so as to reach a predetermined pressure value, and a stroke L of the clutch corresponding to said respective clutch piston chamber; for storing a time when a change over instruction is outputted to a selected clutch hydraulic control valve; for finding a time difference between (a) a time when said change over instruction is outputted to said selected clutch hydraulic control valve and (b) a time when a pressure in the clutch piston chamber corresponding to the selected clutch hydraulic control valve reaches a predetermined value; and for determining the abrasion of the gear clutch corresponding to the selected clutch hydraulic control valve from this time difference.