BS ISO 19724:2020 Gasoline engines with direct injection — Cleanliness assessment of fuel injection equipment.
2 Normative references
The following documents are referred to in the text in such a way that some or all of their content constitutes requirements of this document. For dated references, only the edition cited applies. For undated 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 cleanliness by particle concentration
ISO 16232:2018, Road vehicles — Cleanliness of components and systems
3? Terms? and? definitions
For the purposes of this document, the terms and definitions given in ISO 16232 apply.
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4 Procedures 4.1 General All tests shall be carried out in a clean laboratory environment. Failure to achieve a satisfactory blank test level of contamination could indicate unsuitable control of test conditions. Clean room conditions according to ISO 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, and B.1. In order to avoid each laboratory finding a different amount of fluid to be required, a guideline for the volume is given here for each component.
The blank level tests described in ISO 16232:2018, 6.3, are important procedures to check the quality of the 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 thoroughly cleaned by using a fluid like for the cleanliness assessment.
This document covers the following components of the fuel injection equipment:
— high pressure pump;
— injector;
— rail;
— high pressure pipe;
— high pressure sensor.
4.2 General 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 with hydrocarbons, deionised water according to ISO 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 µm.
— Contaminant filter: Cellulose filter 5 µm to 8 µm.
4.3 High 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 bench close to the conditions of the engine. This concerns, for example, the plunger stroke, the driving frequency and 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 ISO 16232:2018, 7.4.5.
Care shall be taken that no contamination from the outside surface of the connectors for fluid inlet and for fluid outlet is transferred to the fluid circuit.
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