BS ISO 19724:2020 pdf download – Gasoline engines with direct injection — Cleanliness assessment of fuel injection equipment
This document specifies cleanliness assessment procedures for evaluating the amount of debris presenton the clean side of the constituent parts of high-pressure gasoline direct fuel injection systems. Thepresence of such debris could lead to a reduction in the system’s operational performance.
While other International Standards (e.g.IS0 16232) relate to the cleanliness of different types ofcomponents used in road vehicle fluid circuits, this document focuses on the special procedures appliedfor the components of gasoline direct fuel injection systems.
The following documents are referred to in the text in such a way that some or all of their contentconstitutes requirements of this document.For dated references,only the edition cited applies.Forundated references,the latest edition of the referenced document (including any amendments) applies.ISO 3696,Water for analytical laboratory use — Specification and test methods
ISO 14644-1,Cleanrooms and associated controlled environments —Part 1: Classification of air cleanlinessby particle concentration
IS0 16232:2018,Road vehicles — Cleanliness of components and systems
3Terms and definitions
For the purposes of this document, the terms and definitions given in ISO 16232 apply.
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All tests shall be carried out in a clean laboratory environment. Failure to achieve a satisfactory blanktest level of contamination could indicate unsuitable control of test conditions.Clean room conditionsaccording to IS0 14644-1, class 8, are recommended as a minimum for these procedures.
The appropriate method to determine the required amount of fluid is by use of an extraction curve(declining test), as described in ISO 16232:2018,22.214.171.124 and B.1. In order to avoid each laboratoryfinding a different amount of fluid to be required, a guideline for the volume is given here for eachcomponent.
The blank level tests described in IS0 16232:2018,6.3,are important procedures to check the quality ofthe laboratory equipment and shall be carried out once a week.
Before starting the test procedure, the outer surface of the component or assembly shall be thoroughlycleaned by using a fluid like for the cleanliness assessment.
This document covers the following components of the fuel injection equipment:- high pressure pump;
一 high pressure pipe;- high pressure sensor.
4.2General test conditions
The following conditions are valid for all the components of the injection equipment.- Medium: Gasoline test fluid (hydrocarbon similar to gasoline).
For such components which during the production process did not come into contact withhydrocarbons, deionised water according to IlSO 3696,Grade 3 with detergent is also possible (e.g.for pipes, rails, high pressure sensors).
– Temperature: Room temperature.- outlet pressure: Atmosphere.- Pre-filtration: ≤5 um.
– Contaminant filter: Cellulose filter 5 um to 8 um.
4.3High pressure pump
4.3.1 Method A
The test of the high-pressure pump shall be carried out by operating the pump on a functional test benchclose to the conditions of the engine.This concerns, for example, the plunger stroke, the driving frequencyand the fuel flow.The pump under test is assembled to a cam box and driven by an electric motor.
This method (see Table 1) is part of lS0 16232:2018,7.4.5.
Care shall be taken that no contamination from the outside surface of the connectors for fluid inlet andfor fluid outlet is transferred to the fluid circuit.
4.4 Injector The injector shall be operated by applying the electrical energising like at the engine. The resulting vibrations and pressure pulsations are considered to be essential for removing the contamination and bringing it out of the injector. The injection period (energising time) may be increased to about 90 % of the total cycle in order to get a high through flow to wash the particles out and to reach the required fluid quantity in an appropriate time. The flow direction shall be reverse to the injection direction (with the internal fuel filter removed) in order to ensure that the orifices of the injector will not retain any particles. Only for such types of injectors where the internal filter cannot be removed, the normal flow direction shall be applied (see Table 3).BS ISO 19724 pdf download.