1、BRITISH STANDARD AUTOMOBILE SERIES BS AU 265-2:1995 ISO 6518-2: 1995 Incorporating Amendment No. 1 Road vehicles Ignition systems Part 2: Electrical performance and function test methods ICS 43.060.50BSAU 265-2:1995 This British Standard, having been prepared under the directionof the Engineering Se
2、ctorBoard, was published underthe authority of the Standards Board and comes into effect on 15December1995 BSI 03-2000 The following BSI references relate to the work on this standard: Committee reference MCE/9 Draft for comment 93/709245 DC ISBN 0 580 24945 X Committees responsible for this British
3、 Standard The preparation of this British Standard was entrusted to Technical Committee MCE/9, Ignition equipment for spark ignition engines, upon which the following bodies were represented: Society of Motor Manufacturers and Traders Ltd. Coopted members Amendments issued since publication Amd. No.
4、 Date Comments 9610 September 1997 Indicated by a sideline in the marginBSAU 265-2:1995 BSI 03-2000 i Contents Page Committees responsible Inside front cover National foreword ii 1 Scope 1 2 Ignition system description 1 3 Test equipment 1 4 Parameters to be measured or determined 5 5 Procedures 7 F
5、igure 1 Test circuit for ignition systems with mechanical distributor 2 Figure 2 Test circuit for static ignition systems with single-ended coils 3 Figure 3 Test circuit for static ignition systems with double-ended coils 4 Figure 4 Examples of measurements performed on ignition systems 6 Figure 5 S
6、etting of pointed spark gap 8 Figure 6 Spark gap electrode requirements 9 Table 1 Test conditions 7 List of references Inside back coverBSAU 265-2:1995 ii BSI 03-2000 National foreword This British Standard has been prepared by Technical Committee MCE/9. It is identical with ISO6518-2:1995 Road vehi
7、cles Ignition systems Part2:Electrical performance and function test methods, including Technical Corrigendum1, published by the International Organization for Standardization (ISO). A British Standard does not purport to include all the necessary provisions of a contract. Users of British Standards
8、 are responsible for their correct application. Compliance with a British Standard does not of itself confer immunity from legal obligations. Summary of pages This document comprises a front cover, an inside front cover, pagesi andii, pages1 to10, an inside back cover and a back cover. This standard
9、 has been updated (see copyright date) and may have had amendments incorporated. This will be indicated in the amendment table on the inside front cover.ISO 6518-2:1995(E) BSI 03-2000 1 1 Scope This part of ISO 6518 specifies the methods and test conditions for testing battery-supplied ignition syst
10、ems for spark-ignited internal combustion engines. Because of the difficulties in producing repeatable measurements with atmospheric spark gaps and different observers, two methods of obtaining the results necessary for calculating the system output energy are given. Method A using spark gaps for th
11、e energy measurement (test arrangement A). The output energy obtained by this method is called spark energy, E sp . Method B using a Zener diode string for the energy measurement (test arrangement B). The output energy obtained by this method is called Zener discharge energy, E zd . This method is n
12、ot suitable for systems giving alternating spark current. Method B is also recommended for the comparative testing of ignition coils and current interruption systems. 2 Ignition system description For the tests described in the following subclauses, the ignition system components used shall be as sp
13、ecified for the application being examined, i.e.to the original equipment specification. 2.1 Ignition system with mechanical distributor The following components shall be interconnected as shown inFigure 1 or in any other circuit which has been proved to be equivalent. 2.1.1 Single-ended coil which
14、can be the conventional induction coil or an air or magnetic core transformer. 2.1.2 Coil ballast resistor or resistors, if the coil being tested requires a ballast resistor, or any fixed or variable means to make the voltage and/or the current in the ignition circuit vary. 2.1.3 Distributor which d
15、istributes the ignition impulses to the spark-plugs. It may also contain means of triggering and/or timing adjustment, all of which have a proper angular interrelationship to themselves and to the engine. 2.1.4 Auxiliary switching device implicit with the system being tested such as a transistorized
16、 control unit. 2.2 Static (distributorless) ignition system with single-ended coils The following components shall be interconnected as shown inFigure 2 or in any other circuit which has been proved to be equivalent. 2.2.1 Coils which, depending on the system tested, may be single-ended coils as des
17、cribed in2.1.1, or a multiple high-tension terminal assembly formed by single-ended coils, or plug-top coils. 2.2.2 Auxiliary switching device implicit with the system being tested such as a transistorized control unit. 2.3 Static (distributorless) ignition system with double-ended coil(s) The follo
18、wing components shall be interconnected as shown inFigure 3 or in any other circuit which has been proved to be equivalent. 2.3.1 Coils which, depending on the system tested, may be double-ended coils, or a multiple high-tension terminal assembly formed by double-ended coils. 2.3.2 Auxiliary switchi
19、ng device implicit with the system being tested such as a transistorized control unit. 3 Test equipment 3.1 Variable d.c.power supply having a10% to90% transient recovery time of not more than504s over the load range encountered in use. It shall have no more than50mV variation in average voltage fro
20、m no-load to full ignition system load and no more than100mV peak-to-peak ripple over the same load range. This power supply may be substituted by a battery with or without a charging system. The power supply shall be positioned immediately adjacent to the system being tested. 3.2 Oscilloscope with
21、a maximum rise time of35ns, with a minimum band pass of10MHz, shall be used (P 1and P 2 ). The overall uncertainty of measurement including voltage and current probes (see3.3 and3.4) shall be less than3%. 3.3 Voltage probe (R D ) with an input capacitance smaller than or equal to5 pF and an input re
22、sistance of100 M7 or greater. 3.4 Current probe (P 1 ) suitable for d.c.to10MHz. 3.5 d.c.ammeter (P 3 ) with a maximum voltage drop of100mV under test conditions.ISO 6518-2:1995(E) 2 BSI 03-2000 1)The distance between rotor electrode and cap electrode shall be maintained constant during spark durati
23、on or as agreed between user and supplier. 2)The arrow shows the sequence of the sparks. 3)Set according to5.3.1. Key P 1 P 2 P 3 P 4 P 5 = current probe, amplifier and oscilloscope = voltage-measuring oscilloscope = d.c.ammeter = d.c.voltmeter = tachometer C 1 R 1 R 2to R 10 R D = load capacity = l
24、oad resistor = suppression impedances (the current and resistance of which are fixed by agreement between the manufacturer and the user) = voltage probe NOTEAn example of an eight-cylinder system is shown Figure 1 Test circuit for ignition systems with mechanical distributorISO 6518-2:1995(E) BSI 03
25、-2000 3 1)Set according to5.3.1. Key P 1 P 2 P 3 P 4 P 5 = current probe, amplifier and oscilloscope = voltage-measuring oscilloscope = d.c.ammeter = d.c.voltmeter = tachometer (crankshaft rotational frequency signal) C 1 R 1 R 2to R 9 R D = load capacity = load resistor = suppression impedances (th
26、e current and resistance of which are fixed by agreement between the manufacturer and the user) = voltage probe NOTEAn example of an eight-cylinder system is shown Figure 2 Test circuit for static ignition systems with single-ended coilsISO 6518-2:1995(E) 4 BSI 03-2000 1)Set according to5.3.1. Key P
27、 1 P 2 P 3 P 4 P 5 = current probe, amplifier and oscilloscope = voltage-measuring oscilloscope = d.c.ammeter = d.c.voltmeter = tachometer (crankshaft rotational frequency signal) C 1 R 1 R 2to R 9 R D = load capacity = load resistor = suppression impedances (the current and resistance of which are
28、fixed by agreement between the manufacturer and the user) = voltage probe NOTE 1For double-ended coils, secondary outlets shall be tested at high voltage. NOTE 2An example of an eight-cylinder system is shown. Figure 3 Test circuit for static ignition systems with double-ended coilsISO 6518-2:1995(E
29、) BSI 03-2000 5 3.6 Voltmeter (P 4 ) with an input resistance of at least10k7/V and with sufficient resolution to indicate differences of10mV easily. 3.7 Distributor or trigger wheel drive stand and attached tachometer (P 5 ) conforming to the following: a) a continuously variable rotational frequen
30、cy adjustment, capable of being varied between10min 1and4000min 1for a distributor drive stand and between20min 1and at least6000min 1for a trigger wheel drivestand; b) the rotational frequency shall be within 5% below400min 1and 20min 1above400min 1 ; c) a tachometer accurate to within 0,2% of indi
31、cated rotational frequency. 3.8 Loads shall be connected to the ignition system by high-voltage, non-resistive metal conductor ignition cables. The length depends on the capacitive load (see3.8.2). 3.8.1 Multi-point spark gap stand, each gap being individually variable (seeFigure 5). 3.8.2 The capac
32、itance C 1simulates the capacitance of the cables and spark-plugs as normally encountered on the engine. This capacitance shall be a low dissipation factor (not greater than3% at1 kHz) secondary ignition cable of a length such that, in conjunction with the capacitor and high-tension probe, the total
33、 capacitance is 50 pF to 55 pF for ignition systems with distributor; 25 pF to 30 pF for static ignition system with single-ended coils; 50 pF to 55 pF for static ignition systems with double-ended coils. To measure the total capacitance, the distributor spark gaps, and the impedances R 2to R 10if l
34、umped resistors, shall be shunted and the ignition cable shall be removed from the ignition coil. NOTE 1It may be necessary to consider the effect of parasitic capacitances. NOTE 2Other values of capacitance may be agreed upon depending on the application. 3.8.3 The resistor R 1simulates lead or car
35、bon fouled spark-plugs. This resistor shall have a low voltage coefficient (maximum0,0005%/V), non-inductive, approximately10W and1 M7 5%. It shall be connected in parallel to the capacitance for some measurements. 3.8.4 A Zener diode string of 1 kV for single-ended coils and two Zener diode strings
36、 of 1 kV and0,5kV for double-ended coils (seeFigure 3), each with a Zener voltage tolerance of 5% under test conditions. 4 Parameters to be measured or determined 4.1 Available voltage, U av Comparing the available voltage, U av , to the voltage required, U spc , to fire spark-plugs in a given engin
37、e determine the adequacy of the ignition system seeFigure 4a). It shall be measured when the system is loaded with the capacitance C 1described in3.8.2. 4.2 Minimum available voltage, U avm The minimum available voltage 1) , U avm , shall be measured when the system is loaded with the capacitance C
38、1and the resistor R 1connected in parallel. The minimum amplitude shall be recorded. This represents the level which can be guaranteed from the system being tested at an ambient temperature of23 C 5 C, a trigger wheel rotational frequency of 2000min 1and a supply voltage of13,5V. 4.3 Secondary outpu
39、t voltage, U s The secondary output voltage, U s , may also be measured for comparison with values obtained for available voltage, U av . 4.4 Interruption current, I pi The interruption current 1) , I pi , determines the energy into the system seeFigure 4c). 4.5 Average current input, I par The aver
40、age current input, I par , determines the average current draw of the system with respect to the d.c.source (alternator, generator, battery, etc.). 4.6 Energy 4.6.1 Inductive spark energy, E spi The inductive spark energy 2) , E spi , is determined by test method A (see5.3.1). It is calculated from
41、the integration of the product of the measured values of spark voltage, U spadjusted to U e : seeFigure 4f) and spark current I spover the spark duration t fspseeFigure 4f). 1) This measurement does not apply to capacitor discharge ignition systems. 2) This is an indication of the amount of electric
42、ally caused erosion which will occur on spark-plug electrodes. Experience is required to use this information effectively.ISO 6518-2:1995(E) 6 BSI 03-2000 4.6.2 Zener discharge energy, E zd The Zener discharge energy, E zd , is determined by test method B. It is calculated from the integration of th
43、e measured values of the product of Zener discharge voltage U zdand Zener discharge current I zdover the Zener discharge duration t fzdseeFigure 4g). 4.6.3 Spark duration or Zener discharge duration This duration within limits is indicative of the igniting capability of the ignition coil output unde
44、r marginal fuel conditions 2)seeFigure 4d), Figure 4f) andFigure 4g). 4.6.4 Maximum spark current, I spm , or maximum Zener discharge current, I zdm The maximum spark current 3) , I spm , or maximum Zener discharge current is the instantaneous current from the secondary winding of the ignition coil
45、flowing through the spark gap after breakdown seeFigure 4f) or through the Zener diodes seeFigure 4g). 4.7 Secondary voltage rise time, t sUr The secondary voltage rise time, t sUr , is an indication of the ability of an ignition system to fire shunted (fouled) spark-plugs. The shorter the secondary
46、 voltage rise time, the less system energy is lost across the fouled shunt and more voltage is available to fire the spark-plug seeFigure 4b). It shall be measured when the system is loaded with the capacitance C 1described in3.8.2 and the resistor R 1described in3.8.3. 3) This measurement does not
47、apply to capacitor discharge ignition systems. 1)The wave form shown occurs in ingnition systems with contact breaker. Figure 4 Examples of measurements performed on ignition systemsISO 6518-2:1995(E) BSI 03-2000 7 To facilitate comparison between systems, the secondary voltage rise time shall be de
48、termined between 1,5 kV and 15 kV, to be repeated between +1,5kV and+15 kV for double-ended coils or as agreed between user and manufacturer. 4.8 Coil primary induced voltage, U pind The coil primary induced voltage 4) , U pind , is useful with respect to contact breaker life in classic ignition sys
49、tems and is an indication of the stress on a semiconductor power switch (unless voltage clamping is used) in inductive energy storage ignition systems seeFigure 4e). If it shall be measured, it may be necessary to use a measuring instrument with a differential input. The primary induced voltage wave form is always preceded (usually within20 4s) by a leakage induction spike. Usually this is ignored in calculations but if the area under the spike curve becomes significant then it is essentia
