| 摘要 |
<p>During engine cranking and after cranking if engine coolant temperature has not yet exceeded a minimum value, an air bypass valve (dashpot) provides maximum additional air to the engine fuel mixture in addition to the air provided in accordance with engine throttle position. During normal engine run conditions with the throttle not effectively closed, the dashpot provides minimum additional air to the fuel mixture. During deceleration when engine throttle is effectively closed, if engine speed is at least a maximum speed IDLEH and then declines, effective dashpot actuation will be 100% (maximum additional air) for engine speeds at least equal to IDLEH, 0% for engine speeds below a minimum speed IDLEL, and for engine speeds between IDLEH and IDLEL, the change (decrease) in dashpot actuation will be proportional to the change in current engine speed and substantially independent of time. If during deceleration engine speed decreases to IDLEL, then dashpot actuation remains at a minimum.</p> |
