US 10,240,573 B2 · System and method for estimating when a predetermined percentage of fuel is burned in a cylinder during an engine cycle using principal component analysis and for controlling spark timing of the cylinder based on the predetermined percentage

Abstract

A system according to the present disclosure includes a first crank angle module, a second crank angle module, and a spark control module. The first crank angle module determines a first crank angle of an engine at which a predetermined percentage of fuel in a first cylinder of the engine is combusted based on pressure in the first cylinder. The second crank angle module determines a relationship between the first crank angle and a second crank angle of the engine at which the predetermined percentage of fuel in a second cylinder of the engine is combusted based on pressure in the first cylinder and pressure in the second cylinder. The spark control module adjusts spark timing of the first cylinder based on the first crank angle, and adjusts spark timing of the second cylinder based on the relationship between the first and second crank angles.

Claims26

Dependent claims

A system comprising:

a first crank angle module that determines a first crank angle of an engine at which a predetermined percentage of fuel in a first cylinder of the engine is combusted based on M pressures in the first cylinder;
a second crank angle module that determines whether a second crank angle of the engine is greater than or less than the first crank angle based on N pressures in the first cylinder and N pressures in a second cylinder of the engine, wherein:
the second crank angle is a crank angle at which the predetermined percentage of fuel in the second cylinder is combusted;
and
M and N are integers greater than one;
and
a spark control module that:
adjusts spark timing of the first cylinder based on the first crank angle;
and
advances spark timing of the second cylinder when the second crank angle is greater than the first crank angle;
and
retards the spark timing of the second cylinder when the second crank angle is less than the first crank angle.

9 more elements

A system comprising:

a first crank angle module that determines a first crank angle of an engine at which a predetermined percentage of fuel in a first cylinder of the engine is combusted based on M pressures in the first cylinder;
a principal component (PC) coefficient module that determines a first PC coefficient of the first cylinder and a second PC coefficient of a second cylinder of the engine based on N pressures in the first cylinder and N pressures in the second cylinder using PC analysis, wherein M and N are integers greater than one;
and
a spark control module that:
adjusts spark timing of the first cylinder based on the first crank angle;
and
adjusts spark timing of the second cylinder based on a relationship between the first and second PC coefficients.

4 more elements

A method comprising:

determining a first crank angle of an engine at which a predetermined percentage of fuel in a first cylinder of the engine is combusted based on M pressures in the first cylinder;
determining whether a second crank angle of the engine is greater than or less than the first crank angle based on N pressures in the first cylinder and N pressures in a second cylinder of the engine, wherein:
the second crank angle is a crank angle at which the predetermined percentage of fuel in the second cylinder is combusted;
and
M and N are integers greater than one;
adjusting spark timing of the first cylinder based on the first crank angle;
and
advancing spark timing of the second cylinder when the second crank angle is greater than the first crank angle;
and
retarding the spark timing of the second cylinder when the second crank angle is less than the first crank angle.

7 more elements

A method comprising:

determining a first crank angle of an engine at which a predetermined percentage of fuel in a first cylinder of the engine is combusted based on M pressures in the first cylinder;
determining a first PC coefficient of the first cylinder and a second PC coefficient of a second cylinder of the engine based on N pressures in the first cylinder and N pressures in the second cylinder using PC analysis, wherein M and N are integers greater than one;
adjusting spark timing of the first cylinder based on the first crank angle;
and
adjusting spark timing of the second cylinder based on a relationship between the first and second PC coefficients.

2 more elements

Dependencies are inferred from the claim text.

System and method for estimating when a predetermined percentage of fuel is burned in a cylinder during an engine cycle using principal component analysis and for controlling spark timing of the cylinder based on the predetermined percentage

Life of this patent

System and method for estimating when a predetermined percentage of fuel is burned in a cylinder during an engine cycle using principal component analysis and for controlling spark timing of the cylinder based on the predetermined percentage

Life of this patent

Abstract

Claims26