초록 ▼

A method of reducing the amount of nitrogen oxides (NOx) in an internal combustion engine in which the air/fuel ratio is controlled higher than a theoreticl air/fuel ratio during normal operation of a vehicle, characterized in that the air/fuel ratio is controlled lower than the theoretical air-fuel

A method of reducing the amount of nitrogen oxides (NOx) in an internal combustion engine in which the air/fuel ratio is controlled higher than a theoreticl air/fuel ratio during normal operation of a vehicle, characterized in that the air/fuel ratio is controlled lower than the theoretical air-fuel ratio for a predetermined period of time during acceleration from the start of acceleration, the control being effected by means for detecting an accelerated state of the vehicle, means for measuring the lapse of time during acceleration from the start of acceleration and means for performing an acceleration increment correction upon detection of acceleration.

대표청구항 ▼

A method of reducing the amount of nitrogen oxides in an internal combustion engine, comprising the steps of: (a) calculating a basic fuel injection duration; (b) calculating an amount of variation in an intake pipe pressure; (c) judging whether or not said amount of variation in the intake pipe pre

A method of reducing the amount of nitrogen oxides in an internal combustion engine, comprising the steps of: (a) calculating a basic fuel injection duration; (b) calculating an amount of variation in an intake pipe pressure; (c) judging whether or not said amount of variation in the intake pipe pressure is larger than a predetermined value; (d) measuring an elapsed time from said amount of variation exceeding said predetermined value; (e) judging whether or not said elapsed time is longer than a predetermined time; (f) controlling the air/fuel ratio to be greater than a stoichiometric air/fuel ratio in response to said basic fuel injection duration both: (1) when said amount of variation in the intake pipe pressure is below said predetermined value, and (2) when said amount of variation in the intake pipe pressure is larger than said predetermined value and said elapsed time is longer than said predetermined time; (g) only when said amount of variation in the intake pipe pressure is larger than said predetermined value and said elapsed time is below said predetermined time, adding said basic fuel injection duration to an incremental injection duration as a final injection time; and (h) controlling the air/fuel ratio in accordance with said final injection time when said amount of variation in the intake pipe pressure is greater than said predetermined value and said elapsed time is shorter than said predetermined time, said incremental injection duration causing said final injection time to produce an air/fuel ratio which is smaller than said stoichiometric air/fuel ratio.