Patent ID: 6736755
Filing Date: 2004-05-18
Classification: B60W,F16H,Y10T

Abstract:
A control system for an automatic transmission in a vehicle comprising:an engine including a starter motor for start and idle-stop control means for outputting signals for idle operation and stop for the engine to an engine control unit in accordance with preset idle stop conditions and on the basis of a vehicle speed signal sensed by a vehicle speed sensor, a steering angle signal sensed by a steering angle sensor, a signal out of brake operation detecting means for detecting brake operation and the like; and an automatic transmission for performing speed change control using as a hydraulic-pressure supply source a main pump driven by said engine, characterized by arranging a bypass hydraulic passage for ensuring communication between said main pump and a point immediately before an engagement-pressure supply port of a forward engagement element in the automatic transmission, a switching valve on said bypass hydraulic passage to allow switching between a communication state and a non-communication state, and switching-valve control means for switching said switching valve between the communication state and the non-communication state.