| 摘要 |
PURPOSE:To provide stable engine idling by providing a device having no effect of variable spark advance caused by variation in negative pressure in a suction system. CONSTITUTION:Combination negative pressure sent from negative pressure outlet ports 4, 5 of a suction passage 2 depends on the opening of a throttle valve 3 which works with step on an acceleration pedal. With an engine idled, the negative pressure forces a diaphgram 9 to move right and a spring 15 to come in contact with a spring shoe, which affects no load on the secondary spring 17. If combination negative pressure makes a little variation during engine idling, the diaphgram 9 is brought in no action to cause no spark advance. When the throttle valve gains further opening, the diaphgram 9 and spring 14 are moved right together to advance ignition timing. |
