Patent ID: 9488083
Filing Date: 2016-11-08
CPC Classification: B60W,F01N,F02D,F02M,F16H,Y02T

Claim Text:
1. An internal combustion engine comprising: an engine exhaust passage; an exhaust purification catalyst arranged in the engine exhaust passage; a hydrocarbon feed valve arranged in the engine exhaust passage upstream of the exhaust purification catalyst; precious metal catalysts carried on exhaust gas flow surfaces of the exhaust purification catalyst; basic exhaust gas flow surface parts formed around the precious metal catalysts, the exhaust purification catalyst having a property of chemically reducing NO a low pressure exhaust gas recirculation system which causes exhaust gas in the engine exhaust passage downstream of the exhaust purification catalyst to be recirculated into an intake passage; a torque converter provided with a lock-up clutch and arranged between an output shaft of the engine and a transmission, the output shaft of the engine being fluidly coupled with an input shaft of the transmission when the engagement action of the lock-up clutch is not being performed, the output shaft of the engine being mechanically coupled with the input shaft of the transmission when the engagement action of the lock-up clutch is being performed; and an electric control unit configured to control the lock-up clutch, wherein when an engagement action of the lock-up clutch should be performed, if an exhaust gas recirculation action by the low pressure exhaust gas recirculation system is being performed and hydrocarbons are injected from the hydrocarbon feed valve within said predetermined range of period, non-sliding engagement of the lock-up clutch is prohibited and the lock-up clutch is engaged by sliding engagement constantly or in accordance with a magnitude of a torque fluctuation of an engine output.