System and Methods for Stoichiometric Compression Ignition Engine Control
First Claim
1. A method for substantially operating a diesel engine at stoichiometry, wherein the diesel engine includes a plurality of cylinders capable of operating in a succession of combustion cycles, the method comprising:
- receiving instruction for a first desired engine output;
substantially regulating fuel delivery into to a first subset of the plurality of cylinders at substantially stoichiometric fuel levels during each of their respective working cycles while the diesel engine is in a first operational state corresponding to the first desired engine output; and
substantially disabling fuel injection into to a second subset of the plurality of cylinders during each of their respective working cycles while the diesel engine is in the first operational state corresponding to the first desired engine output, wherein the ratio of cylinders in the first subset of cylinders and the second subset of cylinders corresponds to the first desired engine output.
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Abstract
The present invention relates to a diesel engine control system and methods for substantially operating a diesel engine at stoichiometric fuel to air ratios. The system may include a fuel processor which receives instructions for a desired engine output and current operating conditions. The fuel processor may also generate fueling instructions for the cylinders, including: substantially regulating fuel delivery into to a first group of cylinders at or near stoichiometric fuel levels, and substantially disabling fuel injection into to a second grouping of cylinders. The number of cylinders being fueled, and therefore undergoing a combustion event corresponds to the desired engine output. This may be calculated by dividing the desired output by the power provided by one cylinder operating at substantially stoichiometric fuel levels. The number of cylinders receiving fuel may be varied over a succession of engine revolutions such that the actual average engine power output conforms to the desired output.
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Citations
18 Claims
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1. A method for substantially operating a diesel engine at stoichiometry, wherein the diesel engine includes a plurality of cylinders capable of operating in a succession of combustion cycles, the method comprising:
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receiving instruction for a first desired engine output; substantially regulating fuel delivery into to a first subset of the plurality of cylinders at substantially stoichiometric fuel levels during each of their respective working cycles while the diesel engine is in a first operational state corresponding to the first desired engine output; and substantially disabling fuel injection into to a second subset of the plurality of cylinders during each of their respective working cycles while the diesel engine is in the first operational state corresponding to the first desired engine output, wherein the ratio of cylinders in the first subset of cylinders and the second subset of cylinders corresponds to the first desired engine output. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A diesel engine control system configured to substantially operate a diesel engine at stoichiometry, wherein the diesel engine includes a plurality of cylinders capable of operating in a succession of combustion cycles, the diesel engine control system comprising:
a fuel processor configured to receive an instruction for a first desired engine output, and further configured to generate fueling instructions for the plurality of cylinders, wherein the fueling instructions include; instructions for substantially regulating fuel delivery into to a first subset of the plurality of cylinders at substantially stoichiometric fuel levels during each of their respective working cycles while the diesel engine is in a first operational state corresponding to the first desired engine output; and instructions for substantially disabling fuel injection into to a second subset of the plurality of cylinders during each of their respective working cycles while the diesel engine is in the first operational state corresponding to the first desired engine output, wherein the ratio of cylinders in the first subset of cylinders and the second subset of cylinders corresponds to the first desired engine output. - View Dependent Claims (11, 12, 13, 14, 15, 16, 17, 18)
Specification