| 摘要 |
<p>PURPOSE:To prevent departure of a car by controlling the operation of a valve of a brake booster according to range, rev count, car velocity and acceleration opening, and switching a booster transformation chamber to the atmosphere when the rev count of an engine is high in an automatic car. CONSTITUTION:An operating member 15 for a control valve 13 is provided on a brake booster 1, and the operating member 15 is operated according to signals for a range of an automatic speed change gear, a rev count of an engine, a car velocity and an acceleration opening to switch the transformation chamber P2 of the booster 1 to the atmosphere. Thus, when the rev count of the engine is high, the transformation chamber of the booster is switched to the atmosphere to operate a booster piston to reliably check the departure of a car.</p> |
