CONTROL SYSTEM OF ENGINE

摘要

A control system of an engine is provided. The control system includes a deceleration fuel cutoff module for performing a deceleration fuel cutoff when a deceleration fuel cutoff condition is satisfied in an engine decelerating state, a purge unit for purging by supplying a purge gas to an intake passage during the deceleration fuel cutoff, an exhaust emission control catalyst provided in an exhaust passage, an O2 sensor provided at a position of the exhaust passage downstream of the exhaust emission control catalyst, an abnormality determining module for determining an abnormality of the exhaust emission control catalyst, and a purge restricting module for restricting the purge during an immediately previous deceleration fuel cutoff.

主权项

1. A control system of an engine in which a purge gas containing evaporated fuel desorbed from a canister is supplied to an intake passage of the engine, the control system comprising:
a deceleration fuel cutoff module for performing a deceleration fuel cutoff to stop a fuel supply from an injector to the engine when a predetermined deceleration fuel cutoff condition is satisfied in a decelerating state of the engine; a purge unit for purging by supplying the purge gas to the intake passage during the deceleration fuel cutoff; an exhaust emission control catalyst provided in an exhaust passage of the engine; an O2 sensor provided at a position of the exhaust passage downstream of the exhaust emission control catalyst; an abnormality determining module for determining an abnormality of the exhaust emission control catalyst by performing a rich operation of the engine when an operation of the engine is shifted from the deceleration fuel cutoff to a normal operation, calculating a total amount of excess fuel with respect to a stoichiometric amount of fuel in a period from the shift of the engine operation until an output value of the O2 sensor changes by a predetermined value due to the rich operation of the engine, and determining whether the exhaust emission control catalyst is abnormal based on the total amount of the excess fuel, the normal operation performed to operate the engine by injecting the fuel from the injector to the engine and combusting the injected fuel; and a purge restricting module for restricting the purge during an immediately previous deceleration fuel cutoff that is a deceleration fuel cutoff performed immediately before the abnormality determination.