HYDRAULIC CONTROLLER OF AUTOMATIC TRANSMISSION FOR VEHICLE

摘要

PROBLEM TO BE SOLVED: To provide a hydraulic controller of automatic transmission for vehicle capable of meeting the rapid increase in required amount of working fluid without increasing the electric power consumption so much. SOLUTION: When a vehicle condition is judged that the required amount of working fluid fed under pressure from a second hydraulic oil pump 54 into a hydraulic control circuit 48 for a power train is increased by means of the working fluid required amount increase judging means 130 with an oil cooler flow reduction controlling means 138, the flow of an oil cooler 89 is reduced and the amount of the working fluid in the hydraulic control circuit 48 is increased by the flow reduction, therefore it does not become necessary to compensate by the revolution speed increase of a second hydraulic pump 54 as well as this enables to meet the rapid increase of the working fluid required amount without increasing the electric power consumption for driving a second hydraulic pump 54 so much and an electric power amount is also lessened by the difference to increase the fuel consumption of a vehicle.