Fuel filter system bubble simulation and test bench

Abstract

The invention discloses a fuel filter system bubble simulation and test bench, and belongs to the technical field of filters. The fuel filter system bubble simulation and test bench is used for testing bubbles generated in a fuel filter, and comprises a common rail pump, a variable frequency motor, a fuel tank, a rough filtration unit, an adjustment unit and a measurement unit, wherein the commonrail pump comprises a high-pressure pump and a low-pressure pump, and the fuel filter is arranged between the high-pressure pump and the low-pressure pump; the variable frequency motor provides powerfor the common rail pump; the fuel tank provides fuel for the common rail pump; the rough filtration unit is arranged between the fuel tank and the low-pressure pump; the adjusting unit is used for adjusting parameters of the test bed to simulate the working condition of the fuel filter; and the measuring unit is used for testing the amount of bubbles in the fuel filter. The fuel filter system bubble simulation and test bench can simulate the bubble generation condition of the fuel filter under the real working condition, obtains the information of the bubble elimination capability under the actual working condition, is good in reliability and accuracy, and can reproduce the test.

Description

technical field [0001] The invention relates to the technical field of filters, in particular to a fuel filter system air bubble simulation and test bench. Background technique [0002] As the emission regulations of the automobile industry become more and more stringent, the diesel engines of national V and above vehicles have fully adopted the structure of high-pressure common rail system to meet higher emission standards. For fuel filters used in high-pressure common rail systems, how to better eliminate air bubbles in the system will directly affect the quality of engine operation. Due to the compressibility and elasticity of air bubbles, it will cause the following problems: First, uncontrolled air bubbles enter the oil pump to cause confusion in the mixing of fuel and air, which eventually leads to abnormal fuel combustion, fluctuations in engine speed, and drivers driving The sudden acceleration and deceleration in the middle will make the engine condition deteriorat...

AI Technical Summary

Problems solved by technology

Due to the compressibility and elasticity of air bubbles, it will cause the following problems: First, uncontrolled air bubbles enter the oil pump to cause confusion in the mixing of fuel and air, which eventually leads to abnormal fuel combustion, fluctuations in engine speed, and drivers driving The sudden acceleration and deceleration in the middle will make the engine condition deteriorate, especially the cold start will be difficult; the second is that the air replaces the fuel to occupy the effective filter area, the filter area becomes smaller, and the flow rate of the fuel through the filter paper is too high, resulting in a poor filter efficiency and The efficiency of water separation is reduced, which will cause the engine to stall in severe cases

[0004] 1. It adopts the test plan stipulated by ISO and GB national test standards. However, it does not truly reflect the positional relationship of the primary fuel filter in the fuel system, nor does it really reflect the characteristics of the components that affect it from the upstream and downstream, so it cannot be simulated. and discover the occurrence of air bubbles in the actual system;

[0005] Second, as the power drive of the fuel system, ordinary gear pumps are generally used in the industry to load the rated flow rate of the fixed-speed control filter, which cannot reflect the impact of different oil pump specifications on the actual engine on the system and the corresponding working conditions; and As the power source of the fuel system, since the flow rate of the fuel filter changes at any time according to the control strategy and operating conditions of the fuel pump, it has a great impact on the generation and elimination of fuel filter bubbles

[0006] In the filter industry, the test technology for the air bubble elimination ability of the fuel filter system is almost blank. Most manufacturers use the equipment specified in the existing standards to carry out the test. However, the current engine high-pressure common rail technology is developing rapidly, and new high-precision products The problems encountered at the application level are also more complex and diverse

The existing test equipment adopts a single power source and control strategy, as well as outdated equipment structure, which cannot detect and solve the bubble generation in the existing fuel filter system, and it is difficult to propose a solution to eliminate bubbles in the future

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