Combustion control systems and methods
AssigneeGM Global Technology Operations LLC
InventorHalim G. Santoso
Life of this patent
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Abstract
A combustion control system for a direct injection engine includes a mean effective pressure (MEP) determination module, a coefficient of variation (COV) determination module, a spark timing module, and a fuel control module. The MEP determination module determines a MEP for a first combustion event of a cylinder based on cylinder pressure measured by a cylinder pressure sensor during the first combustion event. The COV determination module determines a COV for the cylinder based on the MEP. The spark timing module selectively sets a spark timing for a second combustion event of the cylinder based on the COV. The second combustion event is after the first combustion event. The fuel control module that selectively provides fuel for the second combustion event based on the COV.
Claims18
A combustion control system for a direct injection engine, comprising:
- a mean effective pressure (MEP) determination module that determines a MEP for a first combustion event of a cylinder based on cylinder pressure measured by a cylinder pressure sensor during the first combustion event;
- a coefficient of variation (COV) determination module that determines a COV for the cylinder based on the MEP;
- a spark control module that selectively sets a spark timing for a second combustion event of the cylinder based on the COV, wherein the second combustion event is after the first combustion event;
- and
- a fuel control module that selectively provides fuel for the second combustion event based on the COV,
- wherein the fuel control module determines an end of injection (EOI) timing based on the COV and disables the provision of fuel during the second combustion event at the EOI timing.
A combustion control method for a direct injection engine, comprising:
- determining a mean effective pressure (MEP) for a first combustion event of a cylinder based on cylinder pressure measured by a cylinder pressure sensor during the first combustion event;
- determining a coefficient of variation (COV) for the cylinder based on the MEP;
- selectively setting a spark timing for a second combustion event of the cylinder based on the COV, wherein the second combustion event is after the first combustion event;
- selectively providing fuel for the second combustion event based on the COV;
- determining an end of injection (EOI) timing based on the COV;
- and
- disabling the provision of fuel during the second combustion event at the EOI timing.
Dependencies are inferred from the claim text.