Fuel injection controller

摘要

In a fuel injection controller that controls a fuel injection device that injects fuel directly into cylinders of an engine, a unit that detects an interference period gradually shifts an injection period of fuel from the fuel injector from a first period during which the injection period does not overlap with an initial value of the interference period, and is distant from the initial value by a given value or larger toward a second period during which the injection period overlaps with the initial value of the interference period. Then, the fuel injection controller detects an actual interference period according to a variation of an air-fuel ratio (A/F value) detected by an air-fuel ratio sensor toward lean.

主权项

1. A fuel injection controller that controls a fuel injector which injects a fuel directly into a cylinder of an engine during an injection period, comprising:
an air-fuel ratio sensor disposed in an exhaust passage of the engine, and an interference period detection unit detecting an interference period of an crank angle range in which the fuel injected from the fuel injector is adhered to an opened intake valve, wherein the interference period detection unit shifts an injection period from a first period during which the injection period does not overlap with the interference period toward a second period during which the injection period overlaps with the interference period, and then the interference period detection unit detects the interference period according to a variation of an air-fuel ratio detected by an air-fuel ratio sensor.