Patent ID: 6106435
Filing Date: 2000-08-22
Classification: F16H,Y10T

Abstract:
A tie-up decision device for an automatic transmission which decides whether or not tie-up in which engagement of an engagement side clutch proceeds too fast relative to release of a release side clutch has occurred, in case of executing a clutch-to-clutch gearshift in which the engagement side clutch and the release side clutch are simultaneously engaged and released, respectively, comprising:means for setting a deciding term which extends from a time of a command for the gearshift, until r.p.m. of an input shaft of the automatic transmission falls a predetermined magnitude from synchronous r.p.m. of a lower-speed-stage side since beginning of an inertia phase;means for obtaining a fluctuating magnitude of r.p.m. of an output shaft of said automatic transmission from values of the output shaft r.p.m. within the set deciding term; andmeans for deciding the degree of the tie-up on the basis of the obtained fluctuating magnitude.