Dual fuel injection system and a method of controlling such a system
First Claim
1. A dual fuel injection arrangement for use in an internal combustion engine comprising (a) at least one injector for injecting fuel into an inlet manifold of the engine, (b) a single fuel rail system capable of supplying one of a first fuel and a second fuel to the at least one injector, (c) a first control unit using engine parameters and demand parameters for the first fuel to determine injector timing for the first fuel, and (d) a second control unit using supply characteristics of the second fuel to convert injection timing for the first fuel from the first control unit into injector timing for the second fuel.
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Accused Products
Abstract
A dual fuel injection arrangement for an internal combustion engine. Fuel is injected into the inlet manifold ducts to each engine cylinder via injectors. An arrangement of valves allows selected supply of either a first fuel or a second fuel to the injectors via inlet fuel rail and branch lines. Excess fuel is returned to each supply by way of return line (11). Electronic control units determine injection timing for the selected fuel dependent upon engine parameters for the first fuel and upon an adjusted timing for the second fuel where the adjustment takes account of the different characteristics of the second fuel compared with the first fuel. In particular there is disclosed an arrangement where the first fuel is gasoline and the second fuel is a liquified gas.
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Citations
18 Claims
- 1. A dual fuel injection arrangement for use in an internal combustion engine comprising (a) at least one injector for injecting fuel into an inlet manifold of the engine, (b) a single fuel rail system capable of supplying one of a first fuel and a second fuel to the at least one injector, (c) a first control unit using engine parameters and demand parameters for the first fuel to determine injector timing for the first fuel, and (d) a second control unit using supply characteristics of the second fuel to convert injection timing for the first fuel from the first control unit into injector timing for the second fuel.
- 10. A method for controlling fuel injection in an internal combustion engine operating on one of a first fuel and a second fuel injected through at least one injector comprising steps of (a) determining injection timing for the first fuel and (b) converting the injection timing for the first fuel into injection timing for the second fuel using a composition and pressure of the second fuel.
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15. A method of providing, in an internal combustion engine operating on one of a first fuel and a second fuel, an injection-pulse time for the second fuel comprising steps of:
- (a) determining maximum first-fuel-injection-pulse time for the first fuel, (b) determining maximum second-fuel-injection-pulse time for the second fuel, (c) determining difference between the maximum first fuel injection pulse time and the maximum second fuel injection pulse time, (d) starting the first fuel injection pulse, (e) starting the second fuel injection pulse after the first fuel injection pulse following a period of time at least equal to the difference between the maximum first fuel injection pulse time and the maximum second fuel injection pulse time, (f) determining the first fuel injection pulse time after the first fuel injection pulse ends, and (g) calculating the second fuel injection pulse time using the first fuel injection pulse time, and (h) ending the second fuel injection pulse after the second fuel injection pulse time ends.
- View Dependent Claims (16, 17, 18)
Specification