| 摘要 |
PURPOSE:To feed intake air to an intake pipe at the rate most suited for the operational conditions of an engine, by providing two secondary-air control means and operating one of the two control means operated in response to one operational conditions of the engine independently of the other control means which is operated in response to other operational conditions of the engine. CONSTITUTION:An air supply passage 1 has an air control valve 5 for opening and closing the passage 1, and a vacuum chamber 6 is communicated with an intake pipe 3 via a first vacuum passage 8 and a secondary vacuum passage 9. The first vacuum passage 8 has a valve 11 which is operated in response to the temperature of engine cooling water while the second vacuum passage 9 has a vacuum control valve means 12. Further, a shot-air valve means 10 is provided at the connecting section of the first and the second vacuum passages 8, 9. Here, arrangement is such that the air control valve 5 is operated at the time of deceleration, gear change or slight deceleration of the engine for opening the passage 1. |
