Internal combustion engine
AssigneeToyota Jidosha Kabushiki Kaisha
InventorsNoriyasu Adachi, Tetsuji Nagata
Life of this patent
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Abstract
A reference injection quantity of fuel to be injected from a port injection valve and an in-cylinder injection valve as well as an injection ratio are determined based on an operation condition. A ratio between a feedback correction amount for port injection and a feedback correction amount for in-cylinder injection is set equal to a ratio of the reference injection quantity. If an injection quantity obtained as a result of addition of a correction amount is smaller than a minimum injection quantity of the injection valve, feedback correction is prohibited. Meanwhile, if the feedback correction amount is small, only the injection valve attaining a larger injection quantity is subjected to feedback correction.
Claims8
An internal combustion engine comprising a port injection valve injecting a fuel into an intake port and an in-cylinder injection valve injecting a fuel into a combustion chamber, in which the fuel is injected from the port injection valve and the in-cylinder injection valve at a ratio determined in accordance with an operation condition, an air-fuel ratio of an exhaust gas is detected by an air-fuel ratio sensor and a fuel injection quantity is subjected to feedback correction based on an output from the air-fuel ratio sensor;
- wherein
- an injection quantity ratio between a port injection quantity and an in-cylinder injection quantity is calculated, and
- a ratio between a feedback correction amount for port injection and a feedback correction amount for in-cylinder injection is determined based on the calculated injection quantity ratio.
An internal combustion engine comprising a port injection valve injecting a fuel into an intake port and an in-cylinder injection valve injecting a fuel into a combustion chamber, in which the fuel is injected from the port injection valve and the in-cylinder injection valve at a ratio determined in accordance with an operation condition, an air-fuel ratio of an exhaust gas is detected by an air-fuel ratio sensor and a fuel injection quantity is subjected to feedback correction based on an output from the air-fuel ratio sensor;
- wherein
- air-fuel ratio difference representing difference between a target air-fuel ratio and an actual air-fuel ratio is obtained, and based on the air-fuel ratio difference, excessive/insufficient fuel in in-cylinder injection and excessive/insufficient fuel in port injection are calculated,
- the calculated excessive/insufficient fuel in in-cylinder injection is multiplied by in-cylinder injection feedback gain to calculate an in-cylinder injection correction amount, and the calculated excessive/insufficient fuel in port injection is multiplied by port injection feedback gain to calculate a port injection correction amount, and
- the in-cylinder injection feedback gain and the port injection feedback gain are set separately.
Dependencies are inferred from the claim text.