Patent ID: 9488124
Filing Date: 2016-11-08
CPC Classification: F02B,F02D,Y02T

Claim Text:
1. An engine comprising: an engine body equipped with a supercharger; an engine rotational speed sensor which detects an engine rotational speed; an acceleration opening degree sensor which detects a load on the engine; a supercharging pressure sensor which detects a supercharging pressure; a supercharger rotational speed sensor which detects a supercharger rotational speed; and an engine control unit calculates a main injection amount from the engine rotational speed and the acceleration opening degree; fuel is injected based on the main injection amount; the engine control unit calculates a target supercharger rotational speed based on the engine rotational speed, the supercharging pressure, the main injection amount, and the supercharger rotational speed so as to minimize an amount of smoke, CO and HC in an exhaust gas; the supercharger is adjusted based on the target supercharger rotational speed; the engine control unit determines an absolute value of a difference between the supercharger rotational speed and the target supercharger rotational speed relative to a threshold and performs the post-injection as follows: fuel is injected at least once in expansion or exhaust strokes so as to increase exhaust energy based on the post-injection control.