EGR FLOW COMPENSATION FOR A DIESEL AIR HANDLING SYSTEM
First Claim
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1. An apparatus, comprising:
- an internal combustion engine including an intake manifold and an exhaust gas recirculation (EGR) device in fluid communication with the intake manifold;
a processing subsystem structured to;
interpret a charge flow and an air-fuel ratio;
interpret a target exhaust gas recirculation (EGR) fraction and a target air-fuel ratio;
determine an adjusted target EGR mass flow based on the air-fuel ratio, the target air-fuel ratio, the charge flow, and the target EGR fraction; and
provide the adjusted target EGR mass flow to an air handling controller.
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Abstract
A method is disclosed for adjusting a target EGR mass flow in response to a current charge flow and target EGR fraction. The method includes interpreting an air-fuel ratio and a target air-fuel ratio. The method further includes interpreting a charge flow and a target EGR fraction. The method further includes determining an adjusted target EGR mass flow based on the air-fuel ratio, the target air-fuel ratio, the charge flow, and the target EGR fraction. The method further includes controlling an actuator based on the adjusted target EGR mass flow.
23 Citations
23 Claims
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1. An apparatus, comprising:
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an internal combustion engine including an intake manifold and an exhaust gas recirculation (EGR) device in fluid communication with the intake manifold; a processing subsystem structured to; interpret a charge flow and an air-fuel ratio; interpret a target exhaust gas recirculation (EGR) fraction and a target air-fuel ratio; determine an adjusted target EGR mass flow based on the air-fuel ratio, the target air-fuel ratio, the charge flow, and the target EGR fraction; and provide the adjusted target EGR mass flow to an air handling controller. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A method, comprising:
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interpreting an air-fuel ratio and a target air-fuel ratio; interpreting a charge flow and a target EGR fraction; determining an adjusted target EGR mass flow based on the air-fuel ratio, the target air-fuel ratio, the charge flow, and the target EGR fraction; and controlling at least one actuator based on the adjusted target EGR mass flow. - View Dependent Claims (10, 11, 12, 13, 14, 15)
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16. A system, comprising:
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an internal combustion engine having a charge flow, an exhaust flow, an exhaust gas recirculation (EGR) flow path adapted to mix a portion of the exhaust flow into the charge flow; an EGR valve disposed in the EGR flow path; a variable geometry turbocharger (VGT) disposed in the exhaust flow; a processing subsystem comprising; an air handling controller comprising a nominal control module configured to provide a target air-fuel ratio (AFR) and a target EGR fraction, and an actuation module configured to operate the EGR valve and the VGT in response to the target AFR and target EGR fraction; and an EGR adjustment controller comprising an input module configured to interpret a charge flow and an air-fuel ratio, an EGR correction module configured to determine an adjusted target EGR mass flow based on the air-fuel ratio, the target AFR, the charge flow, and the target EGR fraction, and an output module configured to provide the adjusted target EGR mass flow to the air handling controller. - View Dependent Claims (17, 18, 19, 20, 21)
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22. A method, comprising:
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operating an internal combustion engine including an intake manifold and an EGR device in fluid communication with the intake manifold; providing a charge to the internal combustion engine from the intake manifold, the charge including intake air and recirculated exhaust gas from the EGR device; establishing a current ratio between fuel and air, a target ratio between fuel and air, a recirculated exhaust gas fraction of the charge, and a charge flow rate; and determining a change in a target flow rate of the recirculated exhaust gas as a function of the current ratio, the target ratio, the recirculated exhaust gas fraction, and the charge flow rate; and in response to the change in the target flow rate, adjusting flow of the recirculated exhaust gas with the EGR device to regulate oxygen fraction of the charge. - View Dependent Claims (23)
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Specification