RESTART EXTENSION METHOD OF LAMBDA CONTROL IN INTERNAL COMBUSTION ENGINE WITH LAMBDA CONTROL

摘要

PROBLEM TO BE SOLVED: To reduce toxic nitrogen oxide by a simple method as much as possible in a restart process in an internal combustion engine by changing set values of λ control in a predetermined period of time so that lean extension or rich extension of an air-fuel mixture is formed. ;SOLUTION: A change II of a set value FR of λ control prolongs a rise integration part 110 which forms a change of an air ratio λ from a rich condition to a lean condition in a two position controller during a period of a predetermined time interval Δt so as to achieve rich extension of an air-fuel mixture. Consequently, the set value FR forms the rich extension of an air-fuel ratio of air and fuel which are jetted. Moreover, it is possible to further raise a rise diagonal face of the integration part 110 during the predetermined time interval Δt only instead of fixed extension. Rich extension of the air fly(31 mixture which is jetted, namely, restart extension of λ control, is securely done in a restart process only based on various determination standards. Furthermore, it is possible to reduce nitrogen oxide owing to the operation through the optimum air ratio.;COPYRIGHT: (C)1999,JPO