Dedicated exhaust gas recirculation control systems and methods
First Claim
1. An engine control system of a vehicle, comprising:
- a fuel control module that controls fuel injection of a first cylinder of an engine based on a first target air/fuel ratio that is fuel lean relative to a stoichiometric air/fuel ratio and that controls fuel injection of a second cylinder of the engine based on a second target air/fuel ratio that is fuel rich relative to stoichiometry,wherein the first cylinder outputs exhaust to a first three way catalyst (TWC), andwherein the second cylinder outputs exhaust to an exhaust gas recirculation (EGR) valve; and
an EGR control module that controls opening of the EGR valve to;
(i) a second TWC that reacts with nitrogen oxides (NOx) in the exhaust and outputs ammonia to a selective catalytic reduction (SCR) catalyst;
(ii) a conduit that recirculates exhaust back to an intake system of the engine at a location downstream of a compressor of a turbocharger; and
(iii) the first TWC.
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Accused Products
Abstract
An engine control system of a vehicle includes a fuel control module that controls fuel injection of a first cylinder of an engine based on a first target air/fuel ratio that is fuel lean relative to a stoichiometric air/fuel ratio and that controls fuel injection of a second cylinder of the engine based on a second target air/fuel ratio that is fuel rich relative to stoichiometry. The first cylinder outputs exhaust to a first three way catalyst (TWC), and the second cylinder outputs exhaust to an exhaust gas recirculation (EGR) valve. An EGR control module controls opening of the EGR valve to: (i) a second TWC that reacts with nitrogen oxides (NOx) in the exhaust and outputs ammonia to a selective catalytic reduction (SCR) catalyst; and (ii) a conduit that recirculates exhaust back to an intake system of the engine.
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Citations
20 Claims
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1. An engine control system of a vehicle, comprising:
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a fuel control module that controls fuel injection of a first cylinder of an engine based on a first target air/fuel ratio that is fuel lean relative to a stoichiometric air/fuel ratio and that controls fuel injection of a second cylinder of the engine based on a second target air/fuel ratio that is fuel rich relative to stoichiometry, wherein the first cylinder outputs exhaust to a first three way catalyst (TWC), and wherein the second cylinder outputs exhaust to an exhaust gas recirculation (EGR) valve; and an EGR control module that controls opening of the EGR valve to; (i) a second TWC that reacts with nitrogen oxides (NOx) in the exhaust and outputs ammonia to a selective catalytic reduction (SCR) catalyst; (ii) a conduit that recirculates exhaust back to an intake system of the engine at a location downstream of a compressor of a turbocharger; and (iii) the first TWC.
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2. An engine control system of a vehicle, comprising:
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a fuel control module that controls fuel injection of a first cylinder of an engine based on a first target air/fuel ratio that is fuel lean relative to a stoichiometric air/fuel ratio and that controls fuel injection of a second cylinder of the engine based on a second target air/fuel ratio that is fuel rich relative to stoichiometry, wherein the first cylinder outputs exhaust to a first three way catalyst (TWC), and wherein the second cylinder outputs exhaust to an exhaust gas recirculation (EGR) valve; and an EGR control module that controls opening of the EGR valve to; (i) a second TWC that reacts with nitrogen oxides (NOx) in the exhaust and outputs ammonia to a selective catalytic reduction (SCR) catalyst; (ii) a conduit that recirculates exhaust back to an intake system of the engine; and (iii) the first TWC. - View Dependent Claims (3, 4, 5, 6, 7, 8, 9, 10, 20)
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11. An engine control method for a vehicle, comprising:
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controlling fuel injection of a first cylinder of an engine based on a first target air/fuel ratio that is fuel lean relative to a stoichiometric air/fuel ratio, wherein the first cylinder outputs exhaust to a first three way catalyst (TWC); controlling fuel injection of a second cylinder of the engine based on a second target air/fuel ratio that is fuel rich relative to stoichiometry, wherein the second cylinder outputs exhaust to an exhaust gas recirculation (EGR) valve; and controlling opening of the EGR valve to; (i) a second TWC that reacts with nitrogen oxides (NOx) in the exhaust and outputs ammonia to a selective catalytic reduction (SCR) catalyst; and (ii) a conduit that recirculates exhaust back to an intake system of the engine; and (iii) the first TWC. - View Dependent Claims (12, 13, 14, 15, 16, 17, 18, 19)
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Specification