Fuel injection controller

Abstract

In a case that actual values of a fuel injection quantity and fuel pressure are not in consistent with a representative point, an interpolation process is conducted by used of a learn value of a plurality of representative points. During the interpolation process, a computer 30 determines whether the number of learning exceeds a predetermined number N. When the number of learning is less that the number N, the learn value at the representative point is replaced by the learning value at a representative point of the actual values.

Description

technical field [0001] The present invention relates to a fuel injection controller for learning and storing a deviation amount of an operating characteristic of an actuator used for fuel injection control from a reference amount. The deviation amount is calculated with respect to a plurality of regions divided by the parameters used to calculate the fuel injection control. Background technique [0002] In a multi-cylinder engine, each fuel injection valve has a difference in its fuel injection characteristics, which causes unstable rotation of the engine crankshaft. The amount of deviation between the fuel injection characteristics of each fuel injection valve and the reference fuel injection characteristics is learned in order to make the rotational speed of the crankshaft uniform, which is obtained by each fuel injection in each cylinder. DE-19527218B4 shows such a control system. [0003] The amount of deviation is changed in accordance with the fuel pressure supplied ...

AI Technical Summary

Problems solved by technology

[0004] However, in the case where there are representative points in which the amount of deviation has not been learned, the interpolation process cannot be properly performed

Also, even if this learning is performed, an appropriate amount of deviation cannot be learned by performing the interpolation process only once

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