ENGINE FUEL SUPPLY SYSTEM
3 Assignments
0 Petitions
Accused Products
Abstract
Apparatus for controlling dual fuel supply to a fuel injected engine having an electronic engine management system (1) that supplies a primary injector control signal (8) to each of primary fuel injectors (2), the apparatus comprising an emulator (11) that emulates the electrical characteristics of a primary injector, a fuel control switch (10) that switches the primary injector control signal (8) from the primary injector (2) to the emulator (11) when an alternative mode is selected, a monitor (16) that monitors the primary injector control signal (8) to produce a monitor signal, and a controller (4) that processes the monitor signal to derive an alternative control signal which is used to control the primary fuel supply or a mixture of the primary fuel and a secondary fuel such as LPG, to the engine. Preferably the primary fuel supply is modulated by controlling injector control pulses. A secondary fuel may also be injected (3) and controlled by the controller (4).
49 Citations
33 Claims
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1-17. -17. (canceled)
- 18. Apparatus for controlling fuel supply to a fuel injected engine having an electronic engine management system that supplies a primary injector control signal to each of primary fuel injectors, the apparatus comprising an emulator that emulates the electrical characteristics of a primary injector, a fuel control switch that switches the primary injector control signal from the primary injector to the emulator when an alternative mode is selected, a monitor that monitors the primary injector control signal to produce a monitor signal, and a controller that processes the monitor signal to derive an alternative control signal which is used to control the primary fuel supply or a mixture of the primary fuel and a secondary fuel, to the engine.
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33. A method of controlling fuel supply to an engine adapted to run on a primary fuel or a combination of the primary fuel and a secondary fuel, the primary fuel being injected by one or more primary fuel injectors under the control of a primary injector control signal generated by an electronic engine management system, the method comprising providing an emulator to emulate the electrical characteristics of a primary fuel injector, a fuel control switch to switch the primary injector control signal from the primary injector to the emulator when an alternative mode is selected, a monitor to monitor the primary injector control signal to produce a monitor signal, and a controller to process the monitor signal to derive alternative control signals which are used to control supply of the primary or a mixture of primary and secondary fuels to the engine.
Specification