Importance

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Abstract

An exhaust system includes: an exhaust pipe defining an exhaust path of exhaust gas to atmosphere; a recirculation pipe defining a recirculation path separating a part of exhaust gas passing through the exhaust pipe and allowing the part to flow back to a power unit; a purification unit purifying exhaust gas by catalyst; and a heating device heating exhaust gas before purification to activate the purification ability of the catalyst. The heating device includes: an acoustic-wave generator generating acoustic waves by absorbing heat from exhaust gas passing through the recirculation pipe and by giving the heat to working fluid to cause the working fluid to oscillate, and a heat transfer part transferring heat of exhaust gas in the exhaust pipe passing through a downstream position from the purification unit to exhaust gas in the exhaust pipe passing through an upstream position from the purification unit by using acoustic waves.

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First Claim