Apparatus and method for controlling a multi-fuel engine
First Claim
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1. A dual fuel engine, said engine comprising:
- a diesel fuel supply for supplying diesel fuel via a diesel line to one or more engine cylinders;
a secondary fuel supply for supplying a secondary duel to the one or more engine cylinders;
the diesel and secondary fuels being arranged in use to mix with each other and with air for combustion in the one or more engine cylinders,an electronic controller for actively managing the supply of both the diesel and secondary fuels; and
a unit arranged to alter a signal from the electronic controller which controls a diesel supply pressure so as to reduce it and control the pressure of the diesel line, the unit at the same time being arranged to provide an emulation signal to the electronic controller which represents an expected sensed diesel pressure of an unaltered diesel supply.
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Abstract
A dual-fuel engine has a primary fuel supply and a secondary fuel supply, the primary and secondary fuels being arranged in use to mix with each other and with air for combustion in one or more cylinders of the engine. The supply of both the primary and secondary fuels is arranged to be actively managed in accordance with a desired engine performance characteristic by an electronic controller. In one arrangement the supply of a primary fuel is arranged to be actively reduced when a secondary fuel is supplied to the engine.
26 Citations
16 Claims
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1. A dual fuel engine, said engine comprising:
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a diesel fuel supply for supplying diesel fuel via a diesel line to one or more engine cylinders; a secondary fuel supply for supplying a secondary duel to the one or more engine cylinders; the diesel and secondary fuels being arranged in use to mix with each other and with air for combustion in the one or more engine cylinders, an electronic controller for actively managing the supply of both the diesel and secondary fuels; and a unit arranged to alter a signal from the electronic controller which controls a diesel supply pressure so as to reduce it and control the pressure of the diesel line, the unit at the same time being arranged to provide an emulation signal to the electronic controller which represents an expected sensed diesel pressure of an unaltered diesel supply. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A method of improving the economy of a dual fuel engine having one or more engine cylinders and a secondary fuel supply for supplying a secondary fuel to the one or more engine cylinders, the method comprising the steps of:
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actively managing supply of both a diesel fuel and the secondary fuel to the engine using an electronic controller; and controlling the pressure of a diesel rail with a unit that alters the signal from the electronic controller which controls a diesel supply pressure so as to reduce it and which at the same time provides to the electronic controller an emulation signal which represents an expected sensed diesel pressure of an unaltered supply. - View Dependent Claims (11, 12)
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13. A dual fuel engine, said engine comprising:
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one or more engine cylinders; a diesel fuel supply for supplying diesel fuel via a diesel line to the one or more engine cylinders; a secondary fuel supply for supplying a secondary fuel to the one or more engine cylinders; the diesel and secondary fuels being arranged in use to mix with each other and with air for combustion in one or more cylinders of the engine; wherein both the diesel and secondary fuels are arranged to be injected into the one or more or each cylinder; an electronic controller for actively managing the supply of both the diesel and secondary fuels; and a unit arranged to alter a signal from the electronic controller which controls a diesel supply pressure to reduce it and control the pressure of a diesel line;
the unit at the same time arranged to provide an emulation signal to the electronic controller which represents an expected sensed diesel pressure of an unaltered diesel supply. - View Dependent Claims (14, 15, 16)
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Specification