Air/fuel ratio control apparatus of an internal combustion engine
AssigneeHonda Motor Co., Ltd.
InventorsYuji Yasui, Masahiro Sato
Life of this patent
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Abstract
Apparatus and method for air/fuel ratio control for smoothening variation of air/fuel ratio among a plurality of cylinders of an internal combustion engine including a sensor for measuring output of the internal combustion engine. A device calculates a correlation function of each cylinder by taking cross-correlation of values measured by the sensor and a reference signal for each cylinder. A device then calculates a smoothing target value which is common for all of the cylinders. Cylinder controllers produce control input to the respective cylinders such that the correlation function converges to the smoothing target value.
Claims20
An air/fuel ratio control apparatus for smoothening variation of air/fuel ratio among a plurality of cylinders of an internal combustion engine, comprising
- a sensor for measuring output of the internal combustion engine,
- means for calculating a correlation function of each cylinder by taking cross-correlation of values measured by the sensor and a reference signal for each cylinder, the reference signal being a periodic signal in which one combustion cycle of the internal combustion engine is one period,
- means for calculating a smoothing target value which is common for all of the cylinders, and
- cylinder controllers for producing control input to the respective cylinders such the correlation function converges to the smoothing target value.
A method for smoothening variation of air/fuel ratio among a plurality of cylinders of an internal combustion engine, comprising
- measuring output of the engine,
- calculating a correlation function of each cylinder by taking cross-correlation of the measured values and a reference signal for each cylinder, the reference signal being a periodic signal in which one combustion cycle of the internal combustion engine is one period,
- calculating a smoothing target value which is common for all of the cylinders, and
- producing control input to the respective cylinders such the correlation function converges to the smoothing target value.
Dependencies are inferred from the claim text.