| 摘要 |
<p>PURPOSE:To put on a stop lamp only at the time of deceleration by providing a relay circuit to connect the stop lamp and an power source to each other in a circuit to connect an exhaust brake switch. CONSTITUTION:When an exhaust brake works while travelling, an exhaust brake switch 5 comes to be in the closed state, an acceleration pedal 12 is stepped on, an acceleration switch 9 and a clutch switch 10 do not come to be in the opened state as long as a clutch is not opened, and as a parking brake switch 7 is also in the closed state, an electric current from a power source 2 excites an excitating coil of a relay circuit 8, makes a contact point in the closed state and puts on a stop lamp 3. When a vehicle parks, the parking brake switch 7 comes to be in the opened state, and supply of the electric current from the power source 2 to the stop lamp 3 is stopped. Even if an engine is started and the exhaust brake is made to be in the working state in such a state, as the contact point of the relay circuit 8 is in the opened state, putting on of the stop lamp 3 is avoided.</p> |
