| 摘要 |
<p>PROBLEM TO BE SOLVED: To secure a suction pipe negative pressure downstream of a throttle valve as a power source for a master bag and normalize the braking force at the time of deceleration with full closing of throttle valve even during the engine warmup operation including the cold condition with incremental rate of passing air flow owing to an ISC valve. SOLUTION: The degree of opening of an ISC valve to decide the rate of air flow passing through the ISC valve is controlled by the duty ratio of control duty signals set on the basis of the temp. of the engine cooling water and the throttle opening guard value THRG to specify the full closing speed-change line is set on the basis of the cooling water temp. Tw with attention paid on the dependency upon the cooling water temp. (Step 1). The actual degree of throttle opening THR0 is compared with the guard value THRG, and the greater is set at the throttle opening for gear ratio calculation THR (S2-S4), and the target primary pulley revolving speed NP is set (Step 5) by making reference to a fundamental speed-change characteristics map using THR and the car speed V as parameters.</p> |
