Patent ID: 6769502
Filing Date: 2004-08-03
Classification: B60K,B60L,B60W,F16H,Y02T,Y10S,Y10T

Abstract:
An oil pump drive control apparatus for a vehicle comprising:a drive power source for running the vehicle; a first oil pump driven by said drive power source; a second oil pump driven independently of said drive power source; a hydraulic controller which receives an oil pressure generated by said first oil pump and said second oil pump and which performs a speed shift by hydraulically controlling a plurality of friction engagement elements of an automatic transmission of the vehicle; detection means for detecting, as a control parameter, at least one of oil pressure output by said hydraulic controller apparatus; and a rotation speed of said drive power source; and oil pump drive control means for driving said second oil pump so as to maintain an oil pressure needed for the hydraulic control of the friction engagement elements when the detected control parameter is less than or equal to a first predetermined threshold value and for stopping said second oil pump when the detected control parameter is greater than or equal to a second predetermined threshold value that is different from the first predetermined threshold value.