| 摘要 |
PURPOSE:To control the conduction of a post purge relay only when post purging by mounting a switching element for driving the post purge relay and a switching element stopping the clock of a post purge timer. CONSTITUTION:Charge to the capacitor 32 of a timer 28 is started by the OFF of a transistor 34 through the opening of an auxiliary switch 15. That is, when the timing of the timer 28 is started and the charging voltage reaches the predetermined conduction level of the switching element 33 that is, when the timing of the timer 28 is completed, the switching element 33 is at ON, and capacitor 37 is electrified. Accordingly, a transistor 39 is at ON, a transistor 27 for drive is at OFF and post purge is completed. The capacitor 32 is not electrified by the ON of the transistor 34 through the making of the auxiliary switch 15. That is, timing is stopped while the transistor 27 for drive is kept at OFF. |
