Patent ID: 8010277

Claim:
A fuel injection controller for controlling an injection operation of an injector injecting and supplying fuel used for combustion in an engine, the fuel injection controller comprising: an injection execution device that executes injections of plural injection patterns including at least an injection pattern of a multiple injection into a certain cylinder of the engine in a certain order at least on a condition that the certain cylinder is performing non-injection operation before the injections, the injection pattern being defined only by parameters controllable with a control command to the injector; a fluctuation degree obtaining device that obtains a sum of fluctuation degrees of an engine operating condition or an equivalent thereof due to all the injections in each of at least a first injection unit composed of one or a combination of the plural patterns and a second injection unit composed of a different one or combination of the plural patterns with an injection condition; and an injection deviation obtaining device that compares the sums of the fluctuation degrees of the respective injection units performed in the same certain cylinder with each other and obtained by the fluctuation degree obtaining device to obtain a deviation degree between the sums, wherein the execution condition of the injection execution device includes a condition that injection pressure is within a predetermined range as one of satisfaction requirements thereof.