Patent ID: 6497846
Filing Date: 2002-12-24
Classification: B01D,F01N,F02B,F02D,Y02T

Abstract:
An exhaust gas purifying system for an internal combustion engine having a fuel injector valve for directly injecting fuel into a combustion chamber of the engine, comprising:an adsorbent catalytic converter disposed in an exhaust gas passageway of the engine, said adsorbent catalytic converter including a catalytic element having an adsorption layer, said adsorption layer containing an adsorbent which is able to adsorb HC (hydrocarbons) of exhaust gas in a first temperature range and to release the adsorbed HC in a second temperature range which is higher than the first temperature range, and a catalyst component for promoting reaction for oxidizing HC which is released from said adsorbent; and a control unit programmed to carry out judging whether a temperature of said adsorption layer has reached a releasing level so as to make a first judgment result; judging whether a temperature of exhaust gas flowing into said adsorbent catalytic converter will rise upon injection of an additional fuel amount from said fuel injector valve into the combustion chamber during a time period including an expansion stroke and an exhaust stroke of the engine, so as to make a second judgment result; judging whether a temperature of the catalyst component has not reached an activation level at which the catalyst component is activated, so as to make a third judgment result; and causing said fuel injector valve to controllably inject the additional fuel amount during the time period including the expansion stroke and the exhaust stroke of the engine upon making the first judgment result that the temperature of said adsorption layer has reached the releasing level, the second judgment result that the temperature of exhaust flowing into said adsorbent catalytic converter will rise upon injection of the additional fuel amount, and the third judgment result that the temperature of the catalyst component has not reached the activation level.