Fuel injection controller
AssigneeDenso Corporation
InventorKoji Hata
Life of this patent
Estimating the term…
Abstract
A fuel injection controller of an internal combustion engine calculates a correction value for correcting a rotation fluctuation amount among cylinders of the engine during idling stabilization control. The controller calculates an average change in correction value over M number of changes in correction value for the cylinder. If it is determined that the average change is less than or equal to a threshold value a, it is determined that the correction value is stabilized. The correction value at that time is fixed as a learning value of a deviation amount of an injection characteristic among the cylinders. Thus, the fuel injection controller suitably achieves accurate learning of an inter-cylinder variation in the injection characteristic of the fuel injection valve and performing of the learning in a short time.
Claims4
A fuel injection controller comprising:
- an injecting means for performing fuel injection by operating a fuel injection valve of a multi-cylinder internal combustion engine based on a command value of an injection amount of the fuel injection valve;
- a fluctuation restricting means for calculating a fluctuation correction value for restricting rotation fluctuation of an output shaft of the engine among cylinders of the engine and for reflecting the fluctuation correction value in the operation of the fuel injection valve when the fuel injection is performed;
- and
- a learning means for learning a deviation amount of an injection characteristic of the fuel injection valve in accordance with the fluctuation correction value, wherein
- the learning means has a determining means for determining whether the fluctuation correction value is stabilized based on an average change in the fluctuation correction value, and
- the learning means learns the deviation amount if the determining means determines that the fluctuation correction value is stabilized.
Dependencies are inferred from the claim text.