CONSTANT SPEED TRAVEL DEVICE

摘要

PURPOSE:To protect control of an unexpected traveling condition by making no judgement on a switch condition until an ON state is broken once even if limit speed in low speed is overrun when a switch in regard to constant speed control under the fixed set speed is in ON state. CONSTITUTION:Outputs of a set switch SW4 and a resume switch SW5 are input as well as outputs of a vehicle sped switch SW2, a clutch switch SW3 and a break switch SW6 are input in a CPU. And an output of a vacuum switch SW7 disposed on a surge tank ST is also input therein. On the other hand, the output of CPU is connected to each of valves V1-V3 which control a negative pressure actuator AC through each of drive circuits D1-D3. And the travel device has no control condition without determining a switch condition until the ON state is broken once even if limit speed in low speed is overrun when switches SW4 and SW5 in regard to constant speed control under the fixed set speed has the ON state.