Controller for automatic transmissions

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, and
• switching-valve control means for switching said switching valve to the communication state during a predetermined time period when said idle-stop control means output a release command for releasing an idle stop of the engine after said idle stop.

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;
• an automatic transmission for performing speed change control using as a hydraulic-pressure supply source a main pump driven by said engine;
• a solenoid valve for directly supplying from said main pump an engagement pressure of a forward engagement element of said automatic transmission;
• and
• a solenoid-valve control means for current-value controlling operation of the solenoid valve, characterized in that
• said solenoid-valve control means include means for outputting a command for at least more than a predetermined pressure required for complete engagement of said forward engagement element with regard to a current value of said solenoid valve when said idle-stop control means output a release command for releasing an idle stop of the engine after the idle stop.