초록 ▼

An engine control and combustion quality detection system and method are provided for an internal combustion engine having at least one control input such as spark advance angle or air/fuel ratio. A base value is established for the control input and the control input is periodically perturbed about

An engine control and combustion quality detection system and method are provided for an internal combustion engine having at least one control input such as spark advance angle or air/fuel ratio. A base value is established for the control input and the control input is periodically perturbed about the base value. A sensor senses an engine parameter such as knock or engine roughness representing the combustion quality of the engine and provides an output representing this engine parameter. A slope calculation device receives the output from the sensor when the control input is being perturbed about the base value and determines the slope or differential of the output from the sensor to determine the engine parameter as a function of the control input, thereby to provide an indication of combustion quality of the engine. By determining the combustion quality of the engine by calculating the slope of the sensor output when the perturbation device perturbs the first control input about the established base value, the noise component of the sensor output is substantially eliminated. The slope of the sensor output should be at or close to zero when combustion quality is acceptable.

대표청구항 ▼

An engine control and combustion quality detection system for an internal combustion engine having at least one control input, said system comprising: means for establishing a base value for a first one of said at least one control input; perturbations means for periodically perturbing said first co

An engine control and combustion quality detection system for an internal combustion engine having at least one control input, said system comprising: means for establishing a base value for a first one of said at least one control input; perturbations means for periodically perturbing said first control input about said base value; a sensor for sensing an engine parameter representing combustion quality and providing an output representing said engine parameter; and slope calculation means, receiving said output from said sensor when said perturbation means perturbs said first control input about said base value, for determining a slope of said output from said sensor with respect to perturbations in said first control input indicating combustion quality of said engine.