| 摘要 |
PURPOSE:To prevent a battery from being dead for sure by making the operation of a timer circuit ineffective during the driving of an engine to operate an auxiliary heater optionally and operating the timer circuit at the time of the stoppage of the engine. CONSTITUTION:When an engine is operated, a transistor Tr3b is on by an output H from an engine revolution detecting unit 3a. At this stage, when an operation switch 6 is thrown in, the output of a comparator 3c is L, and the output of an NAND circuit 3d is H, while the Tr3e is on. Consequently, the timer circuit 3f cannot be operated, and outputs of a comparator 3g and an AND circuit 3h are brought to H, while a contact 3k of a relay 3i is on, and an electric main body 4 is operated. Meanwhile, when the engine is stopped, to the contrary, Tr3b and 3e are off, and the timer 3f is on operation. The electric heater main body 4 is operated within the time set thereby. |
