ROBUST ESTIMATION OF BIODIESEL BLEND RATIO FOR ALTERNATIVE FUEL COMBUSTION
First Claim
1. Method to control an internal combustion engine fueled by a fuel blend of a first fuel and a second fuel, the method comprising:
- operating the engine with a fuel blend of a first fuel and a second fuel;
monitoring a value of a first combustion parameter during engine operation;
monitoring a first value for a second combustion parameter during engine operation;
determining a second value for the second combustion parameter in accordance with a predetermined correspondence among said first combustion parameter, said second combustion parameter, and a predetermined fuel blend of the first fuel and the second fuel;
determining the fuel blend based upon a difference between the first and second values for the second combustion parameter; and
controlling the engine based upon the fuel blend.
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Accused Products
Abstract
A method to control an internal combustion engine includes operating the engine with a fuel blend of a first fuel and a second fuel, monitoring a value of a first combustion parameter during engine operation, monitoring a first value for a second combustion parameter during engine operation, determining a second value for the second combustion parameter in accordance with a predetermined correspondence among the first combustion parameter, the second combustion parameter, and a predetermined fuel blend of the first fuel and the second fuel, determining the fuel blend based upon a difference between the first and second values for the second combustion parameter, and controlling the engine based upon the fuel blend.
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Citations
20 Claims
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1. Method to control an internal combustion engine fueled by a fuel blend of a first fuel and a second fuel, the method comprising:
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operating the engine with a fuel blend of a first fuel and a second fuel; monitoring a value of a first combustion parameter during engine operation; monitoring a first value for a second combustion parameter during engine operation; determining a second value for the second combustion parameter in accordance with a predetermined correspondence among said first combustion parameter, said second combustion parameter, and a predetermined fuel blend of the first fuel and the second fuel; determining the fuel blend based upon a difference between the first and second values for the second combustion parameter; and controlling the engine based upon the fuel blend. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. Method to control an internal combustion engine fueled by a fuel blend of a diesel fuel and a biodiesel fuel, the method comprising:
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operating the engine with a fuel blend of a diesel fuel and a biodiesel fuel; monitoring a value of a first combustion parameter during engine operation; monitoring a first value for a second combustion parameter during engine operation; determining a second value for the second combustion parameter in accordance with a predetermined correspondence among said first combustion parameter, said second combustion parameter, and a predetermined fuel blend of the diesel fuel and the biodiesel fuel; determining the fuel blend based upon the first and second values for the second combustion parameter; and controlling the engine based upon the fuel blend. - View Dependent Claims (9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19)
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20. Method to control an internal combustion engine fueled by a fuel blend of a diesel fuel and a biodiesel fuel, the method comprising:
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operating the engine with a fuel blend of a diesel fuel and a biodiesel fuel; monitoring a value of exhaust oxygen fraction during engine operation; monitoring a first value for air fuel ratio during engine operation; referencing a second value for air fuel ratio from a predetermined look-up table correlating values of exhaust oxygen fraction and air fuel ratio at a fuel blend of 100 percent diesel fuel and 0% biodiesel fuel; determining the fuel blend based upon the first and second values for air fuel ratio; and controlling the engine based upon the fuel blend.
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Specification