METHOD AND APPARATUS FOR MEASURING PISTON-STROKE END PRESSURE OF FRICTIONAL ENGAGEMENT ELEMENT, CORRECTION-VALUE CALCULATION METHOD AND APPARATUS FOR CALCULATING CORRECTION VALUE FOR AUTOMATIC TRANSMISSION ON THE BASIS OF PRESSURIZATION VALUE MEASURED BY THE MEASURING METHOD AND APPARATUS, AND AUTOMATIC TRANSMISSION WHICH UTILIZES CORRECTION VALUE CALCULATED BY THE CALCULATION METHOD AND APPARATUS

摘要

PROBLEM TO BE SOLVED: To measure a piston stroke end pressure of a frictional engagement element constituting an automatic transmission in a state of assembly, and reduce the time for the measurement.

SOLUTION: A piston stroke end pressure is measured in the state that the frictional engagement element of the automatic transmission is assembled. The displacement of one side-face of the frictional member is detected, and the pistion is pressurized to push the frictional member to one side, so that the one side-face of the frictional member is brought into contact with a thrust-stopper. The contact position is set as a reference point of the displacement. The value of the pressure activing on the piston is measured at a point of time when a detected displacement has reached a determined displacement which is set at a position specified distance away from the reference point to the other side.

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