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US 11,067,014 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.
Claims19
A system comprising:
- a spark-ignition internal combustion engine having an intake system structured to deliver induction gas to an intake manifold of the engine, a fuel system structured to provide a mixed fuel and air charge to a combustion chamber of the engine, and an exhaust system including a three-way catalyst;
- a compressor coupled to an inlet of the intake system;
- a low pressure exhaust gas recirculation (EGR) system structured to recirculate exhaust gas to the intake system at least from an intermediate position of the three-way catalyst;
- and
- an electronic control unit (ECU) configured to determine a knock index value and recirculate exhaust gas to the intake system with the low pressure EGR system to reduce a likelihood of engine knock in response to the knock index value exceeding a knock threshold value.
2 more elements
A method, comprising:
- operating a spark ignition engine;
- interpreting a parameter affecting an operation of the spark ignition engine;
- determining a knock index value in response to the parameter;
- and
- flowing exhaust gas with a low pressure exhaust gas recirculation (EGR) system at least from an intermediate position of a three-way catalyst in the exhaust to an inlet of the spark ignition engine to reduce a likelihood of engine knock in response to the knock index value exceeding a knock threshold value.
2 more elements
A system comprising:
- a spark-ignition internal combustion engine having an intake system configured to deliver induction gas to an intake manifold of the engine, a fuel system structured to provide a mixed fuel and air charge to a combustion chamber of the engine, and an exhaust system including a three-way catalyst;
- a compressor coupled to an inlet of the intake system and providing a compressed air stream;
- a low pressure exhaust gas recirculation (EGR) system configured to recirculate exhaust gas at least from an intermediate position of the three-way catalyst to the intake system upstream of the compressor;
- a charge-air-cooler (CAC) structured to cool at least a portion of the compressed air stream, the CAC including a variable cooling performance device;
- an electronic control unit (ECU) structured to:
- interpret a parameter affecting an operation of the engine;
- determine a knock index value in response to the parameter;
- and
- provide an engine control command in response to the knock index value exceeding a knock threshold value;
- wherein the low pressure EGR system and the variable cooling performance device are responsive to the engine control command to reduce a likelihood of engine knock in response to the knock index value exceeding a knock threshold value.
7 more elements
Dependencies are inferred from the claim text.