| 摘要 |
PURPOSE:To restrain line pressure from being increased by correcting an initial duty ratio which is determined by the opening of an accelerator in such a way as not to be affected by engine revolutions, and concurrently regulating line pressure to an automatic transmission based on solenoid energizing time in response to a corrected duty ration. CONSTITUTION:An ECU 1 reads the output signal of an accelerator opening sensor 5 first so as to determine an initial duty ratio corresponding to the opening of an accelerator based on a memory table. In the second place, the ECU reads the output signal of an engine revolution sensor 6 so as to determine a correction factor to the engine revolution based on the memory table. Following which, an initial correction factor is corrected by the correction factor so that a corrected duty ratio is thereby determined. Energizing time for a line pressure solenoid 2 is then determined based on the corrected duty ratio. By this constitution, proper throttle pressure is built up, and desired line pressure is thereby obtained with the throttle pressure converted into pressure modifier pressure by means of a valve V2. |
