NOx FEEDBACK FOR COMBUSTION CONTROL
First Claim
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1. A method for controlling combustion in an engine, comprising:
- under a first condition, adjusting an EGR amount of a total cylinder charge in response to engine out NOx levels being below a first threshold.
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Abstract
A method for controlling combustion in an engine is provided. The method comprises under a first condition, adjusting an EGR amount of a total cylinder charge in response to engine out NOx levels being below a first threshold. In this way, NOx levels may be used as feedback to control combustion stability.
40 Citations
20 Claims
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1. A method for controlling combustion in an engine, comprising:
under a first condition, adjusting an EGR amount of a total cylinder charge in response to engine out NOx levels being below a first threshold. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A system comprising:
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an engine including at least one cylinder and an exhaust passage coupled to at least one emission control device; an exhaust gas recirculation (EGR) system to divert a portion of exhaust from the engine to an air intake of the engine; a NOx sensor arranged in the exhaust passage upstream of the at least one emission control device; and a controller including instructions to; decrease an EGR amount of a total cylinder charge in response to NOx levels in the exhaust being below a first threshold, the NOx levels determined by the NOx sensor. - View Dependent Claims (11, 12, 13, 14)
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15. A method of reducing vehicle emissions, comprising:
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under a first condition, delivering HP-EGR to one or more cylinders of an engine; under a second condition, delivering LP-EGR to one or more cylinders of the engine; and under both the first and second conditions, decreasing an EGR amount of total cylinder charge in response to engine out NOx levels being below a first threshold; and increasing the EGR amount of total cylinder charge in response to engine out NOx levels being above a second threshold, higher than the first threshold. - View Dependent Claims (16, 17, 18, 19, 20)
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Specification