| 摘要 |
PURPOSE:To aim at improvement in fuel consumption, by installing two air pumps for supply of secondary air to an exhaust passage, and selecting these pumps according to a driving state. CONSTITUTION:A supercharging pump 15, serving both as a supercharger and a secondary air supplying air pump, is installed in a supercharging passage 9, and it is connected to an engine output shaft via a solenoid clutch 29. A small flowing air pump 28, driven by a motor via this solenoid clutch 29, is installed in a secondary air passage 27. Separately at the time of stationary driving of an engine and at the transition, it is selected to a state of supplying secondary air from the small flowing air pump 28 and another state of supplying it from the supercharging pump 15 or both air pumps. With this constitution, load being imposed on these air pumps are reduced, and fuel consumption is improvable.
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