DUAL-FUEL ENGINE COMBUSTION MODE TRANSITION CONTROLS
First Claim
1. A system comprising:
- an engine structured to selectably combust a combination of liquid fuel injected into a cylinder of the engine and gaseous fuel provided to the cylinder; and
a controller structured to control operation of the engine at a plurality of ratios of liquid fuel and gaseous fuel by interpolating between a first operating table and a second operating table utilizing a combustion index, the first operating table and the second operating table being stored in a non-transitory controller-readable medium,the first operating table defining first liquid fuel injection parameters for a first ratio of liquid fuel and gaseous fuel,the second operating table defining second liquid fuel injection parameters for a second ratio of liquid fuel and gaseous fuel, the second ratio being greater than the first ratio,the combustion index being empirically determined to provide interpolated liquid fuel injection parameters for a plurality of ratios of liquid fuel and gaseous fuel intermediate the first ratio and the second ratio satisfying an engine knock criterion and an engine emission criterion.
1 Assignment
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Accused Products
Abstract
Apparatuses, methods and systems for controlling operation of dual fuel engines are disclosed. One embodiment is a method for controlling operation of a dual fuel engine based upon a combustion index value. The combustion index may be empirically determined to provide desired engine operation at a plurality of ratios of gaseous fuel and liquid fuel. The desired engine operation may include a number of criteria including, for examiner an engine knock criterion and/or an exhaust emissions criterion. The combustion index value may be determined during operation of the engine based upon measured, estimated or predicted engine operating parameters. The combustion index value may be utilized to interpolate between a first engine operating map for a first ratio of gaseous fuel and liquid fuel and a second engine operating map for a second ratio of gaseous fuel and liquid fuel.
25 Citations
25 Claims
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1. A system comprising:
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an engine structured to selectably combust a combination of liquid fuel injected into a cylinder of the engine and gaseous fuel provided to the cylinder; and a controller structured to control operation of the engine at a plurality of ratios of liquid fuel and gaseous fuel by interpolating between a first operating table and a second operating table utilizing a combustion index, the first operating table and the second operating table being stored in a non-transitory controller-readable medium, the first operating table defining first liquid fuel injection parameters for a first ratio of liquid fuel and gaseous fuel, the second operating table defining second liquid fuel injection parameters for a second ratio of liquid fuel and gaseous fuel, the second ratio being greater than the first ratio, the combustion index being empirically determined to provide interpolated liquid fuel injection parameters for a plurality of ratios of liquid fuel and gaseous fuel intermediate the first ratio and the second ratio satisfying an engine knock criterion and an engine emission criterion. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. A method comprising:
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operating an engine in a first mode in which the engine is fueled with only liquid fuel injected into one or more engine cylinders and the injection of liquid fuel is controlled based upon a first operating map; calculating a combustion index value based upon one or more sensed engine operating parameters and a predetermined formula or a predetermined lookup table; operating the engine in a second mode in which the engine is fueled with a first ratio of liquid fuel injected into one or more engine cylinders and gaseous fuel introduced into an intake system upstream of the one or more engine cylinders and in which the injection of liquid fuel is controlled based upon a first interpolation between the first operating map and a second operating map, the interpolation being based upon the combustion index value; wherein the predetermined formula or the predetermined lookup table is empirically determined to provide combustion under the one or more sensed operating conditions satisfying an engine knock criterion and an exhaust hydrocarbon criterion for a plurality of ratios of liquid fuel and gaseous fuel. - View Dependent Claims (13, 14, 15, 16, 17, 18, 19)
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20. An apparatus comprising:
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a non-transitory controller readable medium configured to store controller executable instructions structured to generate control commands effective to operate an engine in a first mode in which fueling of the engine consists essentially of liquid fuel injected into one or more engine cylinders and the injection of liquid fuel is controlled based upon a first operating map; determine a dimensionless combustion index value based upon one or more sensed engine operating parameters and a predetermined lookup table or a predetermined calculation; operate the engine in a second mode in which the engine is fueled with a first ratio of liquid fuel injected into one or more engine cylinders and gaseous fuel introduced into an intake system upstream of the one or more engine cylinders and in which the injection of liquid fuel is controlled based upon a first interpolation between the first operating map and a second operating map, the interpolation being based upon the dimensionless combustion index value. - View Dependent Claims (21, 22, 23, 24, 25)
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Specification