車両用エンジンにおける燃焼制御方法および車両用エンジンシステム

Japanese Patent JP7055641

B2

A combustion control method during a rich spike engine operation includes the steps of: specifying an exhaust gas A/F based on a first output from a NOx sensor on an upstream side of a catalyst; specifying a NOx concentration in the exhaust gas on the upstream side of the catalyst based on a second output from the NOx sensor; and when the A/F is less than a reference range and the NOx concentration is not more than a reference value, calculating a value P1−P0 between a cylinder pressure P1 at EVO during the rich spike operation and that pressure P0 during a normal operation, when P1−P0 is larger than the reference range and P1>P0, a fuel injection timing at a post injection is retarded, when P1−P0 is smaller than the reference range and P1