Patent ID: 6716127
Filing Date: 2004-04-06
Classification: F16H

Abstract:
A control system for an automatic transmission, comprising:a manual valve capable of outputting an original pressure depending on a select operation of a driver; a pressure regulating valve capable of supplying a working pressure to be obtained by regulating the original pressure which is supplied from the manual valve to an engaging element to be engaged in a D range; a solenoid for supplying a variable control pressure to the pressure regulating valve and controlling a magnitude of working pressure to be outputted by the pressure regulating valve; and a control unit for supplying a filtered current to the solenoid; said control unit selecting a filtering process using a weak filter when the driver switches a range selector from the D range to an N range and then again returns it to the D range during running of a vehicle and returning said filtering process using a weak filter to a filtering process using a strong filter after a predetermined time elapsed.