Fuel metering control system for internal combustion engine
AssigneeHonda Giken Kogyo Kabushiki Kaisha
InventorsHidetaka Maki, Shusuke Akazaki
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Abstract
A fuel metering control system for an internal combustion engine including a feedback loop having an adaptive controller and an adaptation mechanism that estimates controller parameters .theta.. The adaptive controller corrects the quantity of fuel injection to bring a controlled variable obtained at least based on an output of said air/fuel ratio sensor, to a desired value. The convergence speed of the controller parameters is determined by a gain matrix that has non-diagonal and diagonal element. The system is configured that the controller parameters are determined without calculating the non-diagonal elements of the gain matrix, or without calculating using the non-diagonal elements of the gain matrix in the determination, decreasing calculation volume.
Claims40
A system for controlling fuel metering for a multi-cylinder internal combustion engine, comprising:
- an air/fuel ratio sensor installed at an exhaust system of the engine;
- engine operating condition detecting means for detecting engine operating conditions at least including engine speed and engine load;
- fuel injection quantity determining means for determining a quantity of fuel injection for individual cylinders at least based on the detected engine operating conditions;
- a fuel injector for injecting fuel in the individual cylinders of the engine in response to a corrected quantity of the fuel injection;
- and
- a feedback loop having an adaptive controller and an adaptation mechanism that estimates controller parameters at a convergence speed determined by a gain matrix having diagonal and non-diagonal elements, said adaptive controller correcting the quantity of fuel injection to bring a controlled variable at least obtained based on an output of said air/fuel ratio sensor to a desired value,
- wherein said adaptation mechanism estimates the controller parameter independent of the non-diagonal elements of the gain matrix.
A system for controlling fuel metering for a multi-cylinder internal combustion engine, comprising:
- an air/fuel ratio sensor installed at an exhaust system of the engine;
- engine operating condition detecting means for detecting engine operating conditions at least including engine speed and engine load;
- fuel injection quantity determining means for determining a quantity of fuel injection for individual cylinders at least based on the detected engine operating conditions;
- an adaptive correcting means for correcting the quantity of fuel injection such that at least an output of the air/fuel ratio sensor is adaptively brought to a desired air/fuel ratio based upon dynamic engine characteristic parameters, a rate of adaptively converging the dynamic engine characteristic parameters determined by a gain matrix having diagonal and non-diagonal elements, wherein said adaptive correcting means determines the dynamic engine characteristic parameters independent of the non-diagonal elements of the gain matrix;
- and
- a fuel injector for injecting fuel in the individual cylinders of the engine in response to the corrected quantity of fuel injection.
A method for controlling fuel metering for a multi-cylinder internal combustion engine comprising the steps of:
- detecting the air/fuel ratio from an air/fuel ratio sensor installed at an exhaust system of the engine;
- detecting engine operating conditions at least including engine speed and engine load;
- determining a quantity of fuel injection for individual cylinders at least based on the detected engine operating conditions;
- adaptively correcting the quantity of fuel injection such that at least an output of the air/fuel ratio sensor is adaptively brought to converge to a desired air/fuel ratio based upon dynamic engine characteristic parameters, a rate of convergence of the dynamic engine characteristic parameters being based upon a gain matrix, having diagonal and non-diagonal elements, and being determined independent of the non-diagonal elements of the gain matrix;
- and
- injecting fuel in the individual cylinders of the engine in response to the corrected quantity of fuel injection.
A computer program for controlling a fuel metering system for a multi-cylinder internal combustion engine, said computer program controlling the system to perform the steps of:
- detecting engine operating conditions based upon engine operating information data, said detected engine operating conditions including engine speed and engine load;
- determining a quantity of fuel injection for individual cylinders of the multi-cylinder engine based upon the detected engine operating conditions;
- correcting the quantity of fuel injection such that a detected air/fuel ratio is adaptively brought to a desired air/fuel ratio, based upon dynamic engine characteristic parameters using a gain matrix having diagonal and non-diagonal elements,
- calculating the dynamic engine characteristic parameters being performed independent of the non-diagonal elements of the gain matrix;
- and
- driving a fuel injector to inject the corrected quantity of fuel injection.
Dependencies are inferred from the claim text.