| 摘要 |
In 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(14) which adjusts a line pressure, a sensor which detects a real line pressure and a microprocessor (17) which controls the line pressure solenoid valve. The microprocessor is programmed to: calculate a required line pressure(PREQ) according to the running state of the vehicle, calculate a target line pressure(PREQ*) from the required line pressure(PREQ), the target line pressure(PREQ*) being modified by a safety factor(S1) for line pressure correction, and calculate a line pressure difference(DELTAPERR) between the required line pressure(PREQ) and the real line pressure(PL) and add a feedback control amount(DELTAPFB) according to the line pressure difference to the target line pressure to calculate a command line pressure(PL*) control the line pressure valve based on the command line pressure(PL*).
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