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US 11,598,277 B2Granted
System and method for reducing engine knock
AssigneeCummins Inc.
InventorsMarten H. Dane, J. Steven Kolhouse, Thomas M. Yonushonis, J. Stephen Wills, Samuel C. Geckler
Life of this patent
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Abstract
A method includes operating a spark ignition engine and flowing low pressure exhaust gas recirculation (EGR) from an exhaust to an inlet of the spark ignition engine. The method includes interpreting a parameter affecting an operation of the spark ignition engine, and determining a knock index value in response to the parameter. The method further includes reducing a likelihood of engine knock in response to the knock index value exceeding a knock threshold value.
Claims18
A method, comprising:
- interpreting a parameter affecting an operation of an internal combustion engine receiving a compressed intake air flow;
- determining a knock index value in response to the parameter, wherein the knock index value is an incremental indicator of a risk of engine knock occurring during a combustion event;
- and
- reducing an intake manifold temperature to reduce a likelihood of the engine knock occurring during the combustion event in response to the knock index value exceeding a knock threshold value.
1 more element
A method, comprising:
- interpreting a parameter affecting an operation of an internal combustion engine that receives a compressed intake air flow and a recirculated exhaust gas flow;
- determining a knock index value in response to the parameter, wherein the knock index value is an incremental indicator of a risk of engine knock occurring during a combustion event;
- and
- reducing an intake manifold temperature to reduce a likelihood of the engine knock occurring during the combustion event in response to the knock index value exceeding a knock threshold value, wherein reducing the intake manifold temperature includes adjusting a temperature of the recirculated exhaust gas flow by providing a selected amount of high temperature coolant and a selected amount of low temperature coolant to a cooler that cools the recirculated exhaust gas flow.
1 more element
Dependencies are inferred from the claim text.