| 摘要 |
A traveling control system for a hydraulically driven vehicle enables the vehicle to travel at a higher speed and also enables a vehicle body to be braked appropriately when the vehicle descends a slope with a travel control valve kept in its neutral position. The traveling control system includes pressure switches 30a, 30b for detecting an operative state of the travel control valve 9, a detection line 31 for detecting a shift position of a transmission 13, a controller 32, a solenoid valve 33, load lines 34a, 34b, a shuttle valve 35 and a control line 36 for cooperatively increasing the capacity of a travel motor 7 upon the detection of the travel control valve 9 being in its neutral position and also the transmission is shifted to a high-speed gear. A timer function 32b of the controller 32 allows the capacity of the travel motor 7 to be increased after the elapse of a predetermined time after the detection of the travel control valve 9 being in the neutral position. The load lines 34a, 34b and the shuttle valve 35 jointly serve as a hydraulic source for switching the motor capacity. <IMAGE> |
