Intake Manifold Oxygen Control
First Claim
1. A method for controlling an engine having a fresh air inlet and an exhaust gas recirculation (EGR) circuit, comprising the steps of:
- establishing a pre-selected excess oxygen ratio for combustion in the engine;
establishing a mass flow of EGR gas to be delivered to the intake manifold given total mass flow of both fresh air and EGR gas and adjusting the EGR valve to pass this mass flow of EGR gas;
measuring mass flow of fresh air to the intake manifold to establish a measured mass flow of fresh air;
calculating a desired total mass flow of oxygen to be delivered to the intake manifold of the engine to maintain the ideal excess oxygen ratio;
determining a mass flow of EGR oxygen in the mass flow of EGR gas;
calculating a desired mass flow of fresh oxygen to be delivered to the intake manifold such that the sum of the desired mass flow of fresh oxygen and the mass flow of EGR oxygen is equal to the desired total mass flow of oxygen;
calculating an adjusted mass flow of fresh air to supply the desired mass flow of fresh oxygen;
re-adjusting the EGR valve to cause a change to the mass flow of EGR gas and a change in the measured mass flow of fresh air in the direction toward the adjusted mass flow of fresh air.
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Accused Products
Abstract
A method for controlling intake manifold oxygen for an engine having a fresh air inlet and an exhaust gas recirculation (EGR) circuit includes the steps of: establishing an ideal excess oxygen ratio for combustion in the engine; calculating a total mass flow of oxygen to be delivered to an intake manifold of the engine to maintain the ideal excess oxygen ratio; determining a mass flow of EGR oxygen in the mass flow of EGR gas; and controlling a desired mass flow of fresh oxygen to be delivered to the intake manifold such that the sum of the desired mass flow of fresh oxygen and the mass flow of EGR oxygen is equal to the desired total mass flow of oxygen, by re-adjusting the EGR valve.
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Citations
18 Claims
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1. A method for controlling an engine having a fresh air inlet and an exhaust gas recirculation (EGR) circuit, comprising the steps of:
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establishing a pre-selected excess oxygen ratio for combustion in the engine; establishing a mass flow of EGR gas to be delivered to the intake manifold given total mass flow of both fresh air and EGR gas and adjusting the EGR valve to pass this mass flow of EGR gas; measuring mass flow of fresh air to the intake manifold to establish a measured mass flow of fresh air; calculating a desired total mass flow of oxygen to be delivered to the intake manifold of the engine to maintain the ideal excess oxygen ratio; determining a mass flow of EGR oxygen in the mass flow of EGR gas; calculating a desired mass flow of fresh oxygen to be delivered to the intake manifold such that the sum of the desired mass flow of fresh oxygen and the mass flow of EGR oxygen is equal to the desired total mass flow of oxygen; calculating an adjusted mass flow of fresh air to supply the desired mass flow of fresh oxygen; re-adjusting the EGR valve to cause a change to the mass flow of EGR gas and a change in the measured mass flow of fresh air in the direction toward the adjusted mass flow of fresh air. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A method for coordinating control of exhaust gas recirculation from a exhaust system of a turbocharged internal combustion engine to an intake system of the engine, the method comprising:
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developing data representing a mass flow rate of fresh air that is entering the intake system; calculating data representing a mass flow rate of recirculated exhaust gas that is mixed with the fresh air entering the intake system by calculating data representing mass flow rate through the engine cylinders and calculating the difference between the data representing the calculated mass flow rate through the engine cylinders and the data representing the mass flow rate of fresh air entering the intake system; adjusting an EGR valve to pass the mass flow rate of recirculated exhaust gas; establishing an ideal excess oxygen ratio for combustion in the engine; measuring mass flow of fresh air to the intake manifold; calculating a desired total mass flow of oxygen to be delivered to an intake manifold of the engine to maintain the ideal excess oxygen ratio; determining a mass flow of EGR oxygen in the mass flow of recirculated exhaust gas; calculating a desired mass flow of fresh oxygen to be delivered to the intake manifold such that the sum of the desired mass flow of fresh oxygen and the mass flow of EGR oxygen is equal to the desired total mass flow of oxygen; calculating an adjusted set-point mass flow of fresh air to supply said desired mass flow of fresh oxygen; and re-adjusting the EGR valve for an adjustment of the mass flow rate of recirculated exhaust gas in a direction of adjustment that seeks to null out the difference between said measured mass flow of fresh air and said adjusted set-point mass flow of fresh air. - View Dependent Claims (11, 12, 13, 14, 15, 16, 17, 18)
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Specification