Patent ID: 7588515

Claim:
A fuel injection controller of an internal combustion engine connectable with driving wheels through a connecting device, the fuel injection controller learning a learning value of an operation amount of a fuel injection valve to compensate for a difference between a desired fuel injection amount and an actual fuel injection amount during control of fuel injection of the fuel injection valve, the fuel injection controller comprising: a learning control device that feedback-controls a rotation state of an output shaft of the engine to a target rotation state by performing the fuel injection with a preset pattern in which a relation between the number of multiple injection steps and fuel injection amounts of the respective injection steps is preset; a load sensor that senses a load applied to the output shaft by the connecting device based on a behavior of the output shaft accompanying the fuel injection with a pattern different from the preset pattern; a memory that stores processing information for learning the learning value based on a difference between the operation amount required in the feedback control performed by the learning control device and a standard operation amount, the difference being reduced by its component caused by a difference between the load applied to the output shaft by the connecting device during the feedback control and a load expected with the standard operation amount: a determination device that determines whether there exists a certain state in which a load substantially equal to the load applied to the output shaft by the connecting device during the feedback control is applied to the output shaft; and a learning device that learns the learning value by reflecting a sensing result, which is sensed by the load sensor when the determination device determines that the certain state exists, in the processing information; wherein the connecting device includes a fluid friction connecting portion connected to the output shaft and an automatic transmission mechanism for changing rotation speed of an output of the fluid friction connecting portion in accordance with a shift position thereof; and the determination device determines that the certain state exists when the automatic transmission mechanism is in a shift position at which the feedback control is performed; the learning control device performs the feedback control when the shift position is in a drive range.