Fuel injection controller for internal combustion engine
AssigneeDenso Corporation
InventorsTetsuji Mitsuda, Kuniaki Ueda
Life of this patent
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Abstract
When an engine is driven in a high engine-load condition, a split fuel injection is performed in which a required fuel injection quantity is injected by multiple fuel injections. While the split fuel injection is performed, an actual air-fuel ratio of each cylinder is individually computed based on the output of the air-fuel ratio sensor. Based on the actual air-fuel ratio and a reference air-fuel ratio, an injection-quantity variation of each cylinder is computed. A correction value is computed and learned in order to correct the injection-quantity variation of each cylinder.
Claims11
A fuel injection controller for an internal combustion engine, comprising:
- an air-fuel ratio sensor provided in an exhaust passage of the internal combustion engine;
- and
- an information computing means for performing a split fuel injection in which a required fuel injection quantity is injected by multiple fuel injections when the engine is driven in a high load condition where a load of the engine is greater than a specified load value and the required fuel injection quantity of each cylinder is greater than a specified quantity value, wherein
- based on an actual air-fuel ratio detected by the air-fuel ratio sensor during the split fuel injection and a specified reference air-fuel ratio, the information computing means computes an injection-quantity variation information which represents an injection-quantity variation or an information correlating with the injection-quantity variation in a low load condition where the load of the engine is less than the specified load value.
A fuel injection controller for an internal combustion engine comprising:
- an air-fuel ratio sensor provided in an exhaust passage of the internal combustion engine;
- and
- a variation learning means for performing a split fuel injection in which a required fuel injection quantity is injected by multiple fuel injections when the engine is driven in high engine-load condition where the required fuel injection of each cylinder is greater than a specified value, wherein
- the variation learning means learns an injection-quantity variation in low engine-load condition based on a variation in air-fuel ratio which is obtained from an output of the air-fuel ratio sensor while the split fuel injection is performed, and
- the variation learning means determines a number of times of a fuel injection in the split fuel injection based on a fuel injection quantity which is within a specified fuel injection quantity range where a learning of the injection-quantity variation is executed.
Dependencies are inferred from the claim text.