Process for purifying exhaust gas from gasoline engines

Details Process for purifying exhaust gas from gasoline engines Process for purifying exhaust gas from gasoline engines

B - Operations, Transporting

01

D

B01D 53/94 (2006.01) F01N 3/20 (2006.01) F01N 3/28 (2006.01) F02M 69/04 (2006.01) F01N 3/08 (2006.01) F02B 23/10 (2006.01) F02B 75/12 (2006.01)

Patent

CA 2211878

A process for purifying exhaust gas from a gasoline engine of the fuel-direct-injection type purifies exhaust gas that varies, in response to changes in the air-fuel ratio, between the first exhaust-gas state featured by an air-fuel ratio in the vicinity of the stoichiometrical air- fuel ratio and the second exhaust-gas state that forms a more oxidizing, low-temperature atmosphere and that is featured by an air-fuel ratio greater than the stoichiometrical air-fuel ratio, by using an exhaust-gas purifying catalyst (12) that contains at least one kind of noble metals, such as platinum, and transition metals. With the above-mentioned process, exhaust gas, which is discharged from a gasoline engine of the fuel-direct- injection type (1) that allows the air-fuel ratio to change between the stoichiometrical air-fuel ratio and air-fuel ratios within the lean burn mode, is purified by using the single purifying-use catalyst; therefore, it is possible to simplify the purifying operation for exhaust gas whose compositions and temperature vary widely due to frequent changes in the air-fuel ratio.

L'invention concerne un procédé pour réduire les émissions d'un moteur à injection directe d'essence, faisant appel à un catalyseur (12) pour l'épuration des gaz d'échappement, contenant un métal précieux tel que le platine et les métaux de transitions, permettant de réduire les émissions nocives, même en cas de changement du rapport air-carburant entre un premier état des gaz d'échappement où le rapport air/carburant est proche du rapport théorique et un second état où les gaz d'échappement ont une composition plus oxydante et une température plus faible, correspondant à un rapport air/carburant supérieur au rapport air/carburant théorique. Ce procédé permet de réduire les émissions d'un moteur (1) à injection directe d'essence, où le rapport air/carburant varie entre le rapport théorique et un rapport où le mélange est maigre, en n'utilisant qu'un seul catalyseur d'épuration (12). Ce procédé simplifie l'épuration des gaz d'échappement dont la composition et la température varient largement, suite à des changements fréquents du rapport air/carburant.

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