Patent ID: 6110072
Filing Date: 2000-08-29
Classification: F16H,Y10S,Y10T

Abstract:
An oil pump control device for an automatic transmission controlled by a speed ratio control mechanism in response to an oil pressure, said oil pump control device comprising:an oil pump supplying an oil pressure to an oil pressure control mechanism of said automatic transmission; andan oil pump controller controlling a rotation speed of said oil pump wherein said oil pump controller further comprisesa circuit setting a rotation speed of said oil pump rotation speed to maintain at least a minimum required oil pressure to control said automatic transmission,a stationary vehicle determination circuit determining a condition that a vehicle is braking and a vehicle speed is below a set vehicle speed value,a circuit determining a second pump rotation speed lower than said first pump rotation speed when said stationary vehicle condition is established, anda circuit controlling a pump rotation speed to equal said set pump rotation speeds.