Patent ID: 7765995
Filing Date: 2010-08-03
Classification: F02D,F02M,Y02T

Abstract:
1. A fuel injection device comprising: a fuel injection valve for injecting fuel, which is distributed from a pressure-accumulation vessel; a pressure sensor located in a fuel passage, which extends from the pressure-accumulation vessel to a nozzle hole of the fuel injection valve, and configured to detect pressure of the fuel, the pressure sensor being located closer to the nozzle hole than the pressure-accumulation vessel; a storage unit for storing individual difference information, which indicates an injection characteristic of the fuel injection valve, the injection characteristic being obtained by an examination; and an extracting unit for extracting a fluctuation waveform using the individual difference information stored in the storage unit, wherein the individual difference information is related to a fluctuation pattern of a portion of the fluctuation in detected pressure waveform of the pressure sensor, the fluctuation being attributed to one fuel injection through the nozzle hole, and the portion of the fluctuation is subsequent to an end of the fuel injection.