| 摘要 |
<p>To avoid an electrically controlled gearbox breaking down in a vehicle without any chance for the driver to limp home, to a service depot, or even off the road, a detachable facility (50) is provided in the flex to shifting actuators which change the gears. An emergency unit can be manually connected in, and a rotatory switch can drive the shifting actuator to either of two neutral positions (N1,N2) which lie respectively at the end of a reverse gear alley (AR) and at the end of a forward gear alley (AF2). Preferably there is no forward gear alley opposite any reverse alley (AR) to minimise chances of erroneously, or accidentally, selecting a wrong direction. The two neutral positions (N1,N2) are consecutive positions on the switch. Either the only forward gear is catered for, or one (F1) of them, if there are more than one, is chosen to involve shifting actuators which are all different from those involved in selecting a reverse gear (R) catered for.</p> |
