SYSTEM AND METHOD FOR REDUCING NOx EMISSIONS AFTER FUEL CUT-OFF EVENTS
First Claim
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1. A method of controlling exhaust emission oxides of nitrogen (NOx) from an internal combustion engine (ICE), the method comprising:
- determining when an engine speed is below a first predetermined level; and
controlling an oxygen displacement valve (ODV) such that at least a portion of exhaust gas generated by the ICE is directed into an intake air flow of the ICE.
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Abstract
A method of controlling exhaust emission oxides of nitrogen (NOx) from an internal combustion engine (ICE) includes the steps of determining when an engine speed is below a first predetermined level, and controlling an oxygen displacement valve (ODV) such that at least a portion of exhaust gas generated by the ICE is directed into an intake air flow of the ICE.
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Citations
24 Claims
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1. A method of controlling exhaust emission oxides of nitrogen (NOx) from an internal combustion engine (ICE), the method comprising:
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determining when an engine speed is below a first predetermined level; and
controlling an oxygen displacement valve (ODV) such that at least a portion of exhaust gas generated by the ICE is directed into an intake air flow of the ICE. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. A system for controlling exhaust emission oxides of nitrogen (NOx) from an internal combustion engine (ICE), the system comprising:
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sensors for determining operating conditions of the ICE; and
a controller for determining when an engine speed is below a first predetermined level, and controlling an oxygen displacement valve (ODV) such that at least a portion of exhaust gas generated by the ICE is directed into an intake air flow of the ICE. - View Dependent Claims (13, 14, 15, 16, 17, 18, 19, 20, 21, 22)
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23. A method of controlling exhaust emission oxides of nitrogen (NOx) from a variable valve internal combustion engine (ICE), the method comprising:
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determining when an engine speed is below a first predetermined level; and
controlling the variable valves such that at least a portion of exhaust gas generated by the ICE is directed into an intake air flow of the ICE. - View Dependent Claims (24)
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Specification