Fuel injection control apparatus for internal combustion engines
AssigneeDenso Corporation
InventorSyota Okada
Life of this patent
Estimating the term…
Abstract
When performing a learning control of a fuel injection quantity, a fuel injection control apparatus adds a pilot fuel injection during the working state of a diesel engine when a learning data item (as a fuel injection amount correction value) is calculated per cylinder and fuel pressure. The apparatus compares, based on a combustion stroke of a target cylinder, a work load obtained during an ordinary fuel injection with a work load obtained during the pilot fuel injection. The apparatus calculates a learning data item for the target cylinder in order to correct an actual fuel injection quantity in the target cylinder with the learning data item so that the actual fuel injection quantity approaches a target fuel injection quantity.
Claims8
A fuel injection control apparatus which calculates a fuel injection quantity according to a working state of an internal combustion engine, and instructs fuel injection valves to supply a fuel into corresponding cylinders of the internal combustion engine based on a fuel injection pattern which is made based on the calculated fuel injection quantity, the fuel injection control apparatus comprising:
- fuel injection pattern changing means which changes a fuel injection pattern during a predetermined time period when a learning condition is established during the working of an internal combustion engine;
- working state change calculating means which compares the working state of the internal combustion engine (a) when the fuel injection pattern changing means changes the fuel injection pattern with the working state of the internal combustion engine (b) when the fuel injection pattern changing means does not change the fuel injection pattern, and calculates a change in value of a parameter of the working state of the internal combustion engine generated by the change of the fuel injection pattern performed by the fuel injection pattern changing means;
- and
- learning data calculating means which estimates a change value of the fuel injection quantity which is generated by the change of the fuel injection pattern performed by the fuel injection pattern changing means, and calculates a difference value between the estimated change value of the fuel injection quantity and a reference change value corresponding to the change of the fuel injection pattern, as a learning data item to be used to correct the fuel injection quantity supplied by the fuel injection valve.
Dependencies are inferred from the claim text.