Patent ID: 6012284
Filing Date: 2000-01-11
Classification: B01D,F01N,Y02T

Abstract:
An engine exhaust gas purifying system comprising:a bypass passage provided to an exhaust pipe of an engine;an adsorbing member disposed in the bypass passage, for adsorbing harmful components within exhaust gas;an exhaust gas passage switching device for alternatively switching an exhaust gas passage between the bypass passage and the exhaust pipe;first control means for controlling the exhaust gas passage switching device during an adsorption mode so that exhaust gas flows through the bypass passage, whereby the adsorbing member adsorbs the harmful components within exhaust gas;second control means for controlling the exhaust gas passage switching device during a desorption mode so that exhaust gas flows through the bypass passage, whereby the exhaust gas flowing therethrough causes desorption of the harmful components adsorbed by the adsorbing member;given heat quantity calculation means for calculating heat quantity which the exhaust gas flowing through the bypass passage during the desorption mode gives to the adsorbing member, based on an operational state of the engine; andthird control means for controlling the exhaust gas passage switching device to cause exhaust gas to flow through the exhaust pipe when the heat quantity given to the adsorbing member exceeds a first predetermined value corresponding to heat quantity required for completion of harmful component desorption from the adsorbing member.