START OF INJECTION TIMING
First Claim
1. A method for controlling fuel injection timing into a cylinder of an internal combustion engine having an internal control system comprising the steps of:
- acquiring an indicated torque set-point;
determining engine speed;
acquiring intake manifold pressure;
acquiring intake manifold oxygen concentration;
comparing the intake manifold pressure to steady state reference values for intake manifold pressure at the indicated torque set-point and the engine speed and based on the comparison determining an intake manifold pressure multiplier;
comparing the oxygen concentration to steady state reference values for intake manifold pressure at the indicated and the engine speed and based on the comparison determining an oxygen concentration multiplier; and
based on the intake manifold pressure multiplier, the oxygen concentration multiplier, calculating a compensated start of injection timing.
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Accused Products
Abstract
A method for controlling fuel injection timing into a cylinder of an internal combustion engine having an internal control system based on ignition delay correlation wherein intake manifold pressure and oxygen concentration values are compared to steady state values of manifold pressure and oxygen concentration of a particular indicated torque set-point and engine speed. Comparing intake manifold pressure and oxygen concentration to steady state reference values further comprises experimentally determining exponential factors for intake manifold pressure factor and oxygen concentration factors. A multiplier for intake manifold pressure and oxygen concentration is determined taking into consideration the exponential factors for manifold pressure and oxygen concentration. An equation for correlation ignition delay is used to determine optional SOI timing.
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Citations
18 Claims
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1. A method for controlling fuel injection timing into a cylinder of an internal combustion engine having an internal control system comprising the steps of:
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acquiring an indicated torque set-point; determining engine speed; acquiring intake manifold pressure; acquiring intake manifold oxygen concentration; comparing the intake manifold pressure to steady state reference values for intake manifold pressure at the indicated torque set-point and the engine speed and based on the comparison determining an intake manifold pressure multiplier; comparing the oxygen concentration to steady state reference values for intake manifold pressure at the indicated and the engine speed and based on the comparison determining an oxygen concentration multiplier; and based on the intake manifold pressure multiplier, the oxygen concentration multiplier, calculating a compensated start of injection timing. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17)
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18. An internal combustion engine having an internal control system which controls fuel injection timing into the engine cylinders using an ignition delay correlation based on stead state reference values for intake manifold pressure, intake oxygen concentration, start of injection, and combustion phasing.
Specification