Importance

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Abstract

An exhaust gas recirculation device for reducing nitrogen oxide in exhausting gas of a motorcycle engine includes an exhaust gas recirculation pipe between an exhausting end and a negative pressure air inlet end of the engine; at least one check valve installed in the exhaust recirculation pipe. A negative pressure control valve is installed between the check valve and the inlet end of the engine. Thereby the negative pressure of the engine is used as a power source so as to guide unidirectionally exhaust gas containing carbon dioxide at the exhausting end to the inlet end of the engine through the check valve and the negative pressure control valve so as to decrease operation temperatures of the engine and as a result, nitrogen oxide in the exhaust gas of the engine is reduced.

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First Claim