Patent ID: 6398693
Filing Date: 2002-06-04
Classification: F16H,Y10T

Abstract:
A line pressure control unit of an automatic transmission for a vehicle which performs feedback control of a line pressure of an automatic transmission, comprising:a line pressure solenoid valve which adjusts a line pressure, a sensor which detects a real line pressure, and a microprocessor which controls the line pressure solenoid valve, the microprocessor being programmed to: calculate a required line pressure according to the running state of the vehicle, calculate a target line pressure from the required line pressure, the target line pressure being modified by a safety factor for line pressure correction, and calculate a line pressure difference between the required line pressure and the real line pressure, and add a feedback control amount according to the line pressure difference to the target line pressure to calculate a command line pressure, control the line pressure valve based on the command line pressure.