| 摘要 |
PURPOSE:To assist the safety driving by functioning an alarm upon detection of the openig of a key switch during the travelling. CONSTITUTION:A key switch 2 is connected to a power source 1 and a control circuit 5 with which a power supply switch 3 is connected in parallel with the key switch 2. The control circuit 5 is provided with an output signal from a speed sensor 4 for detecting the travelling of a car, and during the interval where a signal from the speed sensor 4 for informing that the car is travelling is being provided, power supply command signals are fed continuously to the power supply switch 3 to turn it on, thus to receive the power supply from the power source 1. The control circuit 5 will detect the opening of the key switch 2 and provide an output signal from the speed sensor 4 to an alarm 6 if a travel signal is being provided continuously. |
