Patent ID: 6519931
Filing Date: 2003-02-18
Classification: F01N,F02B,F02D,Y02T

Abstract:
A direct gasoline injection type spark igniting internal combustion engine with turbocharger, said engine comprising a turbine of a turbocharger and a catalyst for purifying an exhaust gas which are provided in an exhaust gas passage,wherein said turbine is provided in an exhaust gas passage upstream of said catalyst, a pre catalyst assisting said catalyst is provided in a bypass exhaust gas passage bypassing said turbine, and wherein a control valve for controlling opening areas of both of an exhaust gas passage downstream of said pre catalyst and an exhaust gas passage downstream of said turbine is placed in a junction portion of the exhaust gas passages, said control valve shutting off the flow of the exhaust gas to the passage on the turbine side when starting and warming up the engine, and in remaining areas except the above, the opening of said control valve being controlled to be suitable for the operation of the engine in response to the operating condition of the engine.