ISO-8984-1-1993.pdf
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1、INTERNATIONAL STANDARD IS0 8984- 1 Second edition 1993-l 2-l 5 Diesel engines - Testing of fuel injectors - Part 1: Hand-lever-operated testing and setting apparatus Moteurs diesels - fssais des Porte-injecteurs de combustible complets - Partie 1: Appareillage dessai et de r it has been found in pri
2、nciple effective and adequate to perform the test. Differences in certain physical values between equipment from different manufacturers and of different designs have however resulted in lack of correlation of results. This International Standard consists of two parts (apparatus and method respectiv
3、ely), which together specify the relevant requirements to establish common test conditions. -,-,- INTERNATIONAL STANDARD 0 IS0 IS0 8984-1:1993(E) Diesel engines - Testing of fuel injectors - Part 1: Hand-lever-operated testing and setting apparatus 1 Scope 1.1 This part of IS0 8984 specifies minimum
4、 re- quirements for hand-lever-operated testing and set- ting apparatus to perform certain tests on fuel injectors for diesel (compression-ignition) engines. These tests are detailed in IS0 8984-2 and are - nozzle opening pressure; - chatter (atomization); - spray pattern; - seat leakage; - back-lea
5、kage. This International Standard concerns fuel injectors having a spring-loaded nozzle valve actuated by fuel pressure. It is intended that the specifications form a standard basis. The injector is connected to the apparatus by an adaptor specified by the injector manufacturer. 1.2 This part of IS0
6、 8984 primarily applies to apparatus for testing the injectors of fuel injection equipment for diesel (compression-ignition) engines requiring fuel delivery of up to 300 mm3/(injection x cylinder) at full load. 1.3 No distinction is made between apparatus used in different locations, e.g. laboratori
7、es, factories or service stations. 1.4 It is up to the injector manufacturer to specify which tests are to be selected from those listed in 1 .I, together with any additional requirements for a particular injector. NOTE 1 The terms used in this part of IS0 8984 are in accordance with IS0 7876-2 161,
8、 2 Normative references The following standards contain provisions which, through reference in this text, constitute provisions of this part of IS0 8984. At the time of publication, the editions indicated were valid. All standards are subject to revision, and parties to agreements based on this part
9、 of IS0 8984 are encouraged to investigate the possibility of applying the most recent editions of the standards indicated below. Members of IEC and IS0 maintain registers of currently valid International Standards. IS0 2974:1990, Road vehicles - High-pressure fuel injection pipe end-connections wit
10、h 60 degree female cone. IS0 4010:1977, Road vehicles - Calibrating nozzle, delay pint/e type. IS0 4020-l :I 979, Road vehicles - Fuel filters for automotive compression ignition engines - Part 7: Test methods. IS0 4113:1988, Road vehicles - Calibration fluid for diesel injection equipment. IS0 8984
11、-1:1993(E) 0 IS0 IS0 8984-2:1993, Road vehicles - Testing of fuel in- jectors - Part 2: Test methods. - Pump (3) - Filter (4) 3 Mandatory features of equipment - Fluid container and lid (5) 3.1 Mandatory components NOTE 2 Numbers given in parentheses relate to figure 1. 3.1.1 This part of IS0 8964 c
12、overs those compo- nents within the dashed line (1) in figure 1 which - Non-return valve (6) - Ducts (7) - Isolating valve (8) - Pressure gauge (9) comprise - Operating handle (2) I- I I I L - Outlet connection (IO) - Variable volume device (I I) - / - _-_-_-_; 1 NOTE - Components (131, (14), (15) n
13、ot illustrated (see 3.1.2). Figure 1 - Mandatory components -,-,- 0 IS0 IS0 8984-1:1993(E) 3.1.2 Certain components are not covered by this International Standard. They are however essential to testing: - Adaptor (12) - Blank (13) - Reference pressure gauge (14) - Volume measuring device (15)” - Inj
14、ector (16) 3.2 Specification of components 3.2.1 The whole mechanism within the dashed line (I) shall be of self-contained stiff construction capable of being rigidly mounted; items (4) and (5) may be separate if desired. 3.2.2 The operating handle (2) shall have a vertical plane of action; the line
15、 of action, S, drawn between the positions of the centrepoint of the hand-grip at extremes of stroke shall be approximately vertical. 3.2.3 The pump (3) shall incorporate a piston and lever system such that the following parameters are achieved. a) The stroke of the operating handle along the line o
16、f action, S, which produces geometric delivery, shall be between 125 mm and 325 mm. b) Specific delivery (at atmospheric conditions) shall be between 4,5 mm3 and 6 mm3 per millimetre of stroke along the line of action, S. c) The hydromechanical stiffness of the apparatus, with the isolating valve (8
17、) closed and the outlet connection (IO) closed off, shall not be less than 0,2 MPa/mm (2 bar/mm), measured in the range 5 MPa to 35 MPa (50 bar to 350 bar) and along the line of action, S. 3.2.4 The element of the pump inlet filter (4) shall be replaceable without risk of any foreign matter en- teri
18、ng the pump. The element shall have an initial and average ef- ficiency of more than 80 % using grade 2 test dust2 at a flowrate of 10 I/h when tested in accordance with IS0 4020-l :1979, subclause 6.4. 3.2.5 The fluid container (5), and filter container (4) where applicable, shall have a smooth and
19、 corrosion- resistant internal finish with a sufficiently large open- ing to give ample access for cleaning. The container lid (and breather) shall prevent ingress of foreign matter. 3.2.6 The pump shall discharge through a non-return valve (6) which seals against return flow and has no unloading fe
20、ature. 3.2.7 The ducts (7) connecting the non-return valve (6) to the outlet connection (10) and the isolating valve (8) shall be constructed so that at no point is the cross-section less than 2 mm in diameter. 3.2.8 A manually operable isolating valve (8) shall prevent communication with pressure g
21、auge (9) and variable volume device (1 I), if applicable. It shall be capable of sealing completely in both directions. The valve spindle seal shall be on the pressure gauge side of the sealing interfaces. Change of internal trapped volume due to valve spindle axial movement need not be zero but sha
22、ll be kept to a minimum. 3.2.9 The pressure gauge (9) (and external damper if fitted) shall be of robust construction with the fol- lowing specification: a) Range: 0 (nominal) to 40 MPa E MPa (400 bar +*g bar). b) Accuracy in fitted attitude (including hysteresis): within f 0,6 % of full-scale defle
23、ction from 10 % to 90 % full-scale deflection. The needle shall lie within 1 mm to 2 mm in front of a flat scale. c) Scaling: - length 300 mm minimum; - graduation pitch of 0,2 MPa (2 bar) graduation, to commence at approximately 5 % full-scale deflection. d) Damping characteristic that shall protec
24、t the gauge from damaging shocks due to injector ac- tion but shall not reduce the rate of response to a step change to less than 90 % in 200 ms. I) Not illustrated. 2) Grade 2 test dust. This is a product delivered by MIRA (Motor Industry Research Association). This information is given for the con
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