Exhaust gas purifiying apparatus in internal combustion engine

Abstract

The present invention provides an exhaust gas purifying apparatus in an internal combustion engine comprising an oxidation accelerator (R 1 ) provided upstream of an exhaust gas purifying member (M) in an exhaust passage (P), fuel adding means (R 2 ) and heating means (R 3 ) positioned upstream of the oxidation accelerator (R 1 ) and control means (C) for controlling operations of the fuel adding means and the heating means. The control means (C) operates only the fuel adding means (R 2 ) when a temperature of the exhaust gas purifying member is within a predetermined temperature range and a flow speed of the exhaust gas is equal to or more than a predetermined speed, and operates the heating means (R 3 ) and the fuel adding means (R 2 ) when the temperature of the exhaust gas purifying member is within the predetermined temperature range and the flow speed of the exhaust gas is less than the predetermined speed.

1 . An exhaust gas purifying apparatus in an internal combustion engine with an exhaust passage provided with an exhaust gas purifying member therein, comprising:
 a catalyst provided upstream of the exhaust gas purifying member and having an oxidation function;   fuel adding means positioned upstream of the catalyst;   heating means positioned upstream of the catalyst; and   control means for controlling an operation of the fuel adding means and an operation of the heating means,   wherein the control means operates the fuel adding means without operating the heating means when a temperature of the exhaust gas purifying member is within a predetermined temperature range and a flow speed of the exhaust gas is equal to or more than a predetermined speed, and operates the heating means, as well as the fuel adding means when the temperature of the exhaust gas purifying member is within the predetermined temperature range and the flow speed of the exhaust gas is less than the predetermined speed.   
     
     
         2 . An exhaust gas purifying apparatus in an internal combustion engine according to  claim 1 , wherein
 the control means operates the fuel adding means without operating the heating means when the temperature of the exhaust gas purifying member is within the predetermined temperature range, a temperature of the exhaust gas is less than a predetermined exhaust gas temperature and the flow speed of the exhaust gas is equal to or more than the predetermined speed.