| 摘要 |
<p>A motor vehicle includes a hydraulically-operated transmission means and a hydraulically operated brake means which are controlled through means of an interlocked control system. The brake means is normally engaged in the absence of fluid pressure and a pump serves both as the charging pump for the fluid pressure to operate the transmission means and as the fluid supply pump for actuating the brake means. The control system includes a valve arrangement for disengaging the transmission means and applying the brake means at any time when transmission charge pressure drops to a predetermined level. The valve arrangement also provides for disengaging the transmission at any time that the service brake is applied. The valve arrangement further provides for releasing the brake means, in response to a manual actuation of a master cylinder, for permitting the vehicle to be towed or otherwise moved when the engine is inoperative.</p> |
