Fuel injection control method for an internal-combustion engine

Details Fuel injection control method for an internal-combustion engine Fuel injection control method for an internal-combustion engine

1995-02-24

1998-08-11

Hart, Douglas

Power plants

Internal combustion engine with treatment or handling of...

Methods

60276, 60285, 60301, F01N 320

Patent

active

057911398

ABSTRACT:
A fuel injection control method controls the air-fuel ratio of the air-fuel mixture to be supplied to an internal-combustion engine provided in its exhaust system with an NOx reducing catalytic converter so that the NOx reducing catalytic converter is able to give full play to its ability. A first air-fuel mixture of a stoichiometric or a fuel-rich air-fuel ratio and a second air-fuel mixture of a lean-fuel air-fuel ratio are supplied alternately for predetermined time intervals respectively. The air-fuel ratio is determined selectively on the basis of parameters indicating the operating condition of the internal-combustion engine and/or factors relating to the time of duration of operation of the internal-combustion engine under predetermined operating conditions, and the ratio between the predetermined time intervals is determined according to parameters indicating the operating condition of the internal-combustion engine and an NOx reduction ratio at which the NOx concentration of the exhaust gas must be reduced to meet an NOx concentration specified in an emission standard.

REFERENCES:
patent: 5437153 (1995-08-01), Takeshima
patent: 5473887 (1995-12-01), Takeshima

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