Device for reducing pressure pulsations in gaseous fuel internal combustion engines

Abstract

An improved block defining a restricted fluid flow passage in a fuel supply system for delivering gaseous fuel to an internal combustion engine. The body is formed to be disposed between and fluidly connect a gaseous fuel supply conduit and a gaseous fuel flow channel, the gaseous fuel flow channel in the restricted fluid communication A predetermined volume is defined between the passage and a nozzle chamber of a fuel injector from which the gaseous fuel is injected into the internal combustion engine. The restricted fluid flow passage has a minimum effective flow area between the gaseous fuel supply conduit and the nozzle chamber. The restricted fluid flow passage is located a predetermined distance from an injection valve seal within the fuel injector. The predetermined distance is calculated based on the velocity of sound in the gaseous fuel and the opening time of the fuel injector.

Description

technical field [0001] The present disclosure relates to an apparatus that is part of a fuel supply system for a gaseous-fueled internal combustion engine and includes a body defining a restricted fluid flow passage to reduce pressure pulsation at a fuel injector nozzle. Background technique [0002] Liquid fuels, such as diesel, and more recently gaseous fuels have been used to fuel automotive engines for many years. The gaseous fuel includes natural gas, propane, hydrogen, methane, butane, ethane, or a mixture thereof, and the like. Engine fuel injection systems typically include a plurality of fuel injectors fluidly connected to a fuel supply conduit. Typically, in the case of a direct injection system, each fuel injector is located in a hole formed in the cylinder head of the engine, and the fuel supply conduit (often called the fuel rail) may be located in the hole formed in the cylinder head or may be through A hole provided in the cylinder head is fluidly connected ...

AI Technical Summary

Problems solved by technology

[0005] Design solutions proposed in the prior art do not take into account the issues of determining the location of the pulsation suppression orifice relative to the injector nozzle for controlling the suppression of pressure pulsations between the fuel rail and the fuel injector and for In the combustion chamber before controlling the fuel pressure in the nozzle chamber

Gaseous fuel due to its physical state can more easily leak through the seals within the fuel injector and possibly leak into the liquid fuel, or if it leaks from the gaseous fuel passage into the hydraulic fluid control chamber within the fuel injector, it could damage the valve Hydraulic function of the actuator

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