| 摘要 |
<p>The invention relates to a control system for controlling a power transmission device arranged between a driving engine and a drive axle of a vehicle and comprising a torque converter and an automatic step gearbox. The gearbox is equipped with an electric control device having a microcomputer, which device permits the operator to select, by means of a selector lever, the desired driving direction of the vehicle even if it is moving in the opposite direction to the desired direction. When a directional command signal is sent to the control device, reversing gear control means therein reverse the working direction of the gearbox so that the gearbox works in the opposite direction to the driving direction. First gear can be obtained by manually operating the selector lever to cause a forced downshift signal to be sent to drive gear control means, provided the vehicle speed is within the working range of second gear. The control system of the invention is particularly suitable for use in construction vehicles such as wheeled loaders.</p> |
