Patent ID: 6234139
Filing Date: 2001-05-22
Classification: F02D,Y02T

Abstract:
An engine control system for an engine operative in a plurality of engine operation modes different in fuel injection pattern according to engine operating conditions, said engine control system comprising:intake air flow control means for controlling an intake air flow introduced into a combustion chamber of the engine from an intake passage according to a control value thereof;engine operating condition monitoring means for monitoring an engine operating condition; andcontrol means for judging based on a change in said engine operating condition whether a mode shift to one of said engine operation modes to another of said engine operation modes is demanded, comparing said control value with a permissible extent of said control value of said intake air flow control means for said one engine operation mode when a specific mode shift between said engine operation modes is demanded, and controlling, when said control value is out of said permissible extent, said intake air flow control means so as to attain a target control value of said intake air flow control means for said one engine operation mode to which said specific mode shift is made while keeping said specific mode shift waiting until said control value reaches said permissible extent.