| 摘要 |
PURPOSE:To reduce the burden of a control valve by providing two compensating fuel passages in parallel, wherein an electromagnetic driven control valve is installed on the first passage, and a negative pressure driven opening/closing valve is installed on the second passage. CONSTITUTION:Two compensating fuel passages 16, 17 are provided in parallel on a fuel passage 4 for the leanest air-fuel. Then, on the first passage 16, an electromagnetic driven control valve 21 which is opened/closed by a driving signal transmitted from an electronic control unit 21 is installed. And, on the second passage 17, a negative pressure driven opening/closing valve 20 which is opened/closed by the pressure in the intake pipe 5 of an engine, being selectively applied. Therefore, it is possible to reduce the burden of the control valve and stably perform the control with the wide range of the air-fuel ratio.
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