Design method for low-noise high-pressure fuel system

Abstract

The invention provides a design method for a low-noise high-pressure fuel system, and aims to solve the problem of difficult control of later noise risk in project development caused by unreasonable design of the high-pressure fuel system. According to the involved method, design parameters of a fuel main pipe, a high-pressure fuel pump and a fuel injector are subjected to DOE analysis, screening is performed by taking system pressure fluctuation and needle valve seating speed as design goals, and performance requirements of a fuel injection quantity and the like are considered, so that the high-pressure fuel system meeting noise requirements is designed; and "one-time correct design" is realized, so that the time-wasting, energy-wasting and money-wasting work of later repeated modification and optimization in development is greatly reduced.

Description

technical field [0001] The invention belongs to the field of automobile engines, and in particular relates to a method for designing a low-noise, high-pressure fuel system. Background technique [0002] The noise of the high-pressure fuel system contributes the most to the total sound pressure of the engine under idling conditions, and is easily perceived by customers. It is a noise problem that occurs frequently in direct injection engines. At present, the NVH design method of high-pressure fuel system is as follows: the first step—design the fuel system scheme, the second step—make a sample, and the third step—test and test the noise of the fuel system, if the noise does not meet the standard (most of them cannot reach the standard at one time) , the fourth step—optimize the design parameters of each single component of the fuel system, the fifth step—test the noise of the fuel system, repeat the fourth and fifth steps until the preset noise target is reached. Because it ...

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Problems solved by technology

[0004] The present invention aims to solve the problem that the unreasonable design of the high-pressure fuel system leads to the difficulty of controlling the noise risk in the middle and later stages of project development, and proposes a low-noise high-pressure fuel system design method, through the design parameters DOE Analysis, screening with system pressure fluctuations and needle valve seating speed as design objectives, taking into account performance requirements such as fuel injection volume, designing a high-pressure fuel system that meets noise requirements, achieving "one-time design right", greatly reducing development, The time-consuming, labor-intensive and costly work of repeated modification and optimization in the later stage

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