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FUEL DELIVERY SYSTEM

  • US 20190040818A1
  • Filed: 08/07/2017
  • Published: 02/07/2019
  • Est. Priority Date: 08/07/2017
  • Status: Abandoned Application
First Claim
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1. A fuel delivery system for a machine powered by Liquified Natural Gas (LNG) fuel, the fuel delivery system comprising:

  • a pressure sensor provided in fluid communication with a main fuel supply line associated with the machine to determine pressure of the LNG fuel in the main fuel supply line;

    a high-pressure fuel rail circuit, at an output of the main fuel supply line, that supplies the LNG fuel to fuel injectors of the machine for injection into respective cylinders of an engine of the machine, wherein the high-pressure fuel rail circuit includes a first fuel supply line at the output of the main fuel supply line, and a first valve in the first fuel supply line;

    a low-pressure circuit, at the output of the main fuel supply line, that supplies the LNG fuel at a low pressure, the low pressure LNG fuel is pressurized and supplied via an intake manifold to at least one of the cylinders of the engine, wherein the low pressure circuit includes a second fuel supply line, distinct from the first fuel supply line, at the output of the main fuel supply line, and a second valve in the second fuel supply line; and

    a controller provided in communication with the pressure sensor, the first valve, and the second valve, the controller configured to;

    receive a signal indicative of the pressure of the LNG fuel present in the fuel supply line;

    compare the pressure of the LNG fuel in the main fuel supply line with a predetermined pressure threshold; and

    control at least one of the first valve and the second valve to selectively supply the LNG fuel to the high-pressure fuel rail circuit and the low-pressure circuit based, at least in part, on the comparison,wherein the LNG fuel is supplied to the engine via the high-pressure fuel rail circuit for injection when the comparison is such that the pressure of the LNG fuel in the main fuel supply line exceeds the predetermined pressure threshold, andwherein the LNG fuel is supplied to the engine via the low-pressure circuit and without injection when the comparison is such that the pressure of the LNG fuel in the main fuel supply line does not exceed the predetermined pressure threshold.

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