Method for enabling a substantially constant total fuel energy rate within a dual fuel engine
First Claim
1. A method for delivering liquid fuel and gaseous fuel to a dual fuel engine operating in a dual fuel mode, the method comprising the steps of:
- (a) establishing a governor output value indicative of a total fuel energy rate desired to be delivered to the engine to maintain a desired engine speed;
(b) determining a first value indicative of a liquid pilot fuel energy rate desired to be delivered to the engine and a second value indicative of a gaseous fuel energy rate desired to be delivered to the engine such that the sum of the desired liquid pilot fuel energy rate and the desired gaseous fuel energy rate is substantially equal to the desired total fuel energy rate of step (a); and
(c) delivering gaseous fuel to the engine in an amount which provides the desired gaseous fuel energy rate and delivering liquid fuel to the engine in an amount which provides the desired liquid pilot fuel energy rate.
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Accused Products
Abstract
A method for delivering liquid fuel and gaseous fuel to a dual fuel engine operating in a dual fuel mode includes establishing a governor output value indicative of a total fuel energy rate desired to be delivered to the engine to maintain a desired engine speed. A first value indicative of a liquid pilot fuel energy rate desired to be delivered to the engine and a second value indicative of a gaseous fuel energy rate desired to be delivered to the engine are each determined such that the sum of the desired liquid pilot fuel energy rate and the desired gaseous fuel energy rate is substantially equal to the desired total fuel energy. A stored gaseous fuel energy content can be updated to assure continued accuracy of the fuel control system of the dual fuel engine.
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Citations
13 Claims
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1. A method for delivering liquid fuel and gaseous fuel to a dual fuel engine operating in a dual fuel mode, the method comprising the steps of:
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(a) establishing a governor output value indicative of a total fuel energy rate desired to be delivered to the engine to maintain a desired engine speed; (b) determining a first value indicative of a liquid pilot fuel energy rate desired to be delivered to the engine and a second value indicative of a gaseous fuel energy rate desired to be delivered to the engine such that the sum of the desired liquid pilot fuel energy rate and the desired gaseous fuel energy rate is substantially equal to the desired total fuel energy rate of step (a); and (c) delivering gaseous fuel to the engine in an amount which provides the desired gaseous fuel energy rate and delivering liquid fuel to the engine in an amount which provides the desired liquid pilot fuel energy rate. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A method of utilizing a governor of a dual fuel engine system to control fuel delivery in both a liquid fuel mode and a dual fuel mode, the method comprising the steps of:
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(a) operating the engine in a liquid fuel mode which includes the steps of; (i) sensing an actual engine speed; (ii) comparing the actual engine speed with a desired engine speed; (iii) establishing a governor output value indicative of a total fuel energy rate desired to be delivered to the engine in order to maintain the desired engine speed; (iv) delivering liquid fuel to the engine in an amount which provides the desired total fuel energy rate of step (a)(iii); (b) operating the engine in a dual fuel mode which includes the steps of; (i) sensing an actual engine speed; (ii) comparing the actual engine speed with a desired engine speed; (iii) establishing a governor output value indicative of a total fuel energy rate desired to be delivered to the engine in order to maintain the desired engine speed; (iv) delivering liquid fuel to the engine in an amount which provides a first fuel energy rate and delivering gaseous fuel to the engine in an amount which provides a second fuel energy rate such that the sum of the first fuel energy rate and the second fuel energy rate is substantially equal to the desired total fuel energy rate of step (b)(iii). - View Dependent Claims (9, 10, 11, 12, 13)
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Specification