| 摘要 |
PURPOSE:To remove danger caused by an increase of a car speed, by suspending a speed increase by a resuming switch, and stopping constant speed running, when the resuming switch and a cancelling switch become on simultaneously. CONSTITUTION:An input terminal of an OR gate 100 for a safety circuit is connected to a resuming switch SW2 and a cancelling switch SW3, respectively, and its output terminal is fed back to one input terminal. When the switch SW3 is closed in the course of a speed increasing operation by the switch SW2, an FF circuit 70 is operated, constant speed running is released, and an output of the gate 100 becomes L and holds it. Therefore, even if the switch SW3 is opened, the circuit 70 maintains the released state of constant speed running. This state is continued until the switch SW2 is opened once. Therefore, even in case when the switch SW2 is not reset in a state that it remains closed in the course of running, constant speed running can be released by closing the switch SW3, and such danger as acceleration is not stopped can be prevented. |
