Patent ID: 9624868
Date: 2017-04-18
CPC Classifications: F02D,Y02T

Claim:
1. A spark-ignition direct injection engine, comprising: an engine body having a cylinder; an intake valve for opening and closing an intake port that opens to the cylinder; an exhaust valve for opening and closing an exhaust port that opens to the cylinder; a fuel injection valve for injecting fuel into the cylinder; a catalyst provided in an exhaust passage; and a controller for operating the engine body by controlling at least the intake and exhaust valves and the fuel injection valve, wherein the controller performs a fuel cut by suspending the fuel injection from the fuel injection valve during deceleration of the engine body in a non-operated accelerator state, and when the speed of the engine body drops to a predetermined speed, the controller resumes the fuel injection from the fuel injection valve, wherein during the fuel cut, the controller opens the exhaust valve on intake stroke and then opens the intake valve, and at a timing after closing the exhaust valve and when mixture gas is blown back to the intake port, the controller closes the intake valve, and wherein during the fuel cut, the controller performs an exhaust open-twice control that opens the exhaust valve on both an exhaust stroke and the intake stroke in a given engine cycle before opening the intake valve on the intake stroke in the given engine cycle.