Internal combustion engine knock control apparatus and method
AssigneeToyota Jidosha Kabushiki Kaisha
InventorZenichiro Mashiki
Life of this patent
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Abstract
When a fuel injection period and a knock determination period switch from a state in which they do not overlap to a state in which they do overlap, operational noise from a fuel injector rides on an output signal from a knock sensor during the knock determination period. By preventing execution of knock control that changes the ignition timing based on determination results from after that switch until a predetermined period of time has passed, it is possible to preferably avoid a case in which the ignition timing is improperly changed based on an erroneous determination in the knock determination due to an effect from operational noise from the fuel injector.
Claims22
A knock control apparatus for a multi-cylinder internal combustion engine, comprising:
- a fuel injection timing changing device that changes a fuel injection timing in each cylinder based on an operating state of the engine;
- a knock determining device that makes a knock determination for each cylinder based on an output signal from a knock sensor during a knock determination period corresponding to each cylinder;
- an engine control amount changing device that changes an engine control amount based on determination results of the knock determination;
- and
- a prohibiting device that prohibits execution of the knock determination when a fuel injection period in a first cylinder overlaps with the knock determination period corresponding to a second cylinder.
A knock control apparatus for a multi-cylinder internal combustion engine, comprising:
- a fuel injection timing changing device that changes a fuel injection timing in each cylinder based on an operating state of the engine;
- a knock determining device that makes a knock determination for each cylinder based on an output signal from a knock sensor during a knock determination period corresponding to each cylinder;
- an engine control amount changing device that changes an engine control amount based on determination results of the knock determination;
- and
- a prohibiting device that prohibits a change in the engine control amount based on the determination results when a fuel injection period in a first cylinder and the knock determination period corresponding to a second cylinder overlap.
A knock control method for a multi-cylinder internal combustion engine, comprising the steps of:
- changing a fuel injection timing in each cylinder based on an operating state of the engine;
- making a knock determination for each cylinder based on an output signal from a knock sensor during a knock determination period corresponding to each cylinder;
- changing an engine control amount based on determination results of the knock determination;
- and
- prohibiting execution of the knock determination when a fuel injection period in a first cylinder overlaps with the knock determination period corresponding to a second cylinder.
A knock control method for a multi-cylinder internal combustion engine, comprising the steps of:
- changing a fuel injection timing in each cylinder based on an operating state of the engine;
- making a knock determination for each cylinder based on an output signal from a knock sensor during a knock determination period corresponding to each cylinder;
- changing an engine control amount based on determination results of the knock determination;
- and
- prohibiting a change in the engine control amount based on the determination results when a fuel injection period in a first cylinder and the knock determination period corresponding to a second cylinder overlap.
Dependencies are inferred from the claim text.