Patent ID: 8316639
Filing Date: 2012-11-27
Classification: F01N,F02B,Y02A,Y02T

Abstract:
1. An internal combustion engine comprising: a combustion chamber including an exhaust port; an exhaust valve arranged to open or close the exhaust port; an exhaust device including an exhaust path arranged to guide exhaust gas discharged from the combustion chamber via the exhaust port; and an exhaust cleaning device provided in the exhaust path and including a catalyst; wherein the exhaust device includes: the exhaust path is arranged to cause the exhaust gas that generated the shock wave and is flowing into the exhaust path from the combustion chamber to pass the convergent section and to collide against the shock wave, which has propagated in the branch section, between the branch section and the divergent section, so as to increase the pressure of the exhaust gas in the convergent section; the exhaust gas is caused to pass the divergent section to generate a new shock wave and thus to decrease the temperature of the exhaust gas; and the catalyst of the exhaust cleaning device is provided in a portion of the exhaust path which is downstream with respect to the divergent section.