Patent ID: 7861691
Filing Date: 2011-01-04
Classification: F02D,F02M

Abstract:
1. A controller for an accumulator fuel injection system provided with a fuel pump which has a plurality of fuel pumping systems in which a suction and a discharge of a fuel are repeatedly performed at an individual timing along with a rotation of an engine output shaft, the accumulator fuel injection system provided with an accumulator in which the fuel supplied from the fuel pump is accumulated, the accumulator fuel injection system provided with a fuel injector which injects the fuel in the accumulator, the controller comprising: a pumping pressure detecting means for successively detecting a variation in a fuel pressure in a fuel passage between the fuel pump and the fuel injector at a respective time of a fuel pumping in the fuel pumping systems; and a pumping characteristic computing means for computing a pumping characteristic with respect to each fuel pumping system based on the variation in the fuel pressure detected by the pumping pressure detecting means; wherein the accumulator fuel injection system includes a fuel pressure sensor disposed downstream of a fuel outlet of the accumulator in a fuel passage from the accumulator to an injection port of the fuel injector; the fuel injector is provided to each cylinder of a multicylinder engine, the fuel injector performs an fuel injection in a specified order thereof, the fuel pressure sensor is provided to each cylinder; and the pumping pressure detecting means detects the variation in the fuel pressure based on an output of the fuel pressure sensor provided to the cylinder in which no fuel injection is currently performed.