| 摘要 |
PURPOSE:To shift a vehicle to switchback travel automatically and quickly without entailing any troublesome operation in a driving system by constituting it so as to perform its control conformed to an accelerator pedal operated variable by merely selecting a forward-backward operating lever when shifting to the switchback travel. CONSTITUTION:When a forward-backward operating lever 24 is selected to shift from normal travel to switchback travel, a control signal for increasing braking force by degrees is outputted to a solenoid 35 of a braking hydraulic pressure control valve 30 by a central processing unit 25 via a digital-to-analog converter 29, on the basis of a signal out of a forward-backward operating lever position detecting sensor 23. If so, hydraulic pressure is fed to a brake operating actuator 14 installed in a traveling driving wheel 5 via a braking hydraulic pressure selector valve 40, thus smooth braking takes place. In addition, a signal for disengaging a clutch 2 is outputted to an actuator selector valve 11, and a clutch controlling actuator 8 is driven and controlled. Moreover, such a signal as setting the extent of throttle valve opening to zero is outputted to a throttle controlling actuator 7. |
