GB/T 21437.2-2008 English PDF (GB/T21437.2-2008)

GB/T 21437.2-2008: Road vehicles -- Electrical disturbances from conduction and coupling -- Part 2: Electrical transient conduction along supply lines only
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GB/T 21437.2-2008
Road vehicles. Electrical disturbances from conduction and coupling. Part 2. Electrical transient conducting along supply lines only
ICS 43.040.10
T35
National Standards of People's Republic of China
GB/T 21437.2-2008/ISO 7637-2.2004
Electric disturbance caused by conduction and coupling of road vehicles
Part 2. Electrical Transient Conduction Along Power Lines
(ISO 7637-2.2004, IDT)
Posted on.2008-02-15
2008-09-01 Implementation
General Administration of Quality Supervision, Inspection and Quarantine of the People's Republic of China
China National Standardization Administration released
Directory
Preface III
1 Range 1
2 Normative references 1
3 Terms and Definitions 1
4 Test Procedure 1
5 Test Equipment and Requirements 4
Appendix A (Normative) Functional Failure Mode Severity Classification 13
Appendix B (Informative) General Techniques for Improving Equipment Electromagnetic Compatibility 17
Appendix C (Normative) Transient Emission Evaluation - Voltage Waveform 18
Appendix D (Normative) Test Pulse Generator Verification Procedure 21
Appendix E (informative annex) Determination of pulse generator energy capacity 23
Appendix F (informative) Sources of transients in road vehicle electrical systems 26
GB/T 21437.2-2008/ISO 7637-2.2004
Foreword
GB/T 21437 “Electrical disturbance caused by conduction and coupling of road vehicles” consists of three parts.
--- Part 1. Definitions and general descriptions;
--- Part 2. Electrical transient conduction along the power line;
--- Part 3. Electrical transients coupled by capacitive and inductive coupling of wires other than power lines.
This part is the second part of GB/T 21437, which is equivalent to ISO 7637-2.2004 "Road vehicles caused by conduction and coupling.
Electrical disturbances Part 2. Conduction of electrical transients along power lines.
The editorial modification is. In Table 1, the UA and UB are annotated.
Appendix A, Appendix C and Appendix D of this part are normative appendices, appendix B, appendix E and appendix F are informative appendices.
This section is proposed by the National Development and Reform Commission.
This part is under the jurisdiction of the National Automobile Standardization Technical Committee.
This section drafted by. China Automotive Technology and Research Center.
Participated in the drafting of this section. Shanghai Volkswagen Automotive Co., Ltd., Ministry of Information Industry Telecommunications Transmission Institute, Changsha Automobile Electrical Research Institute.
The main drafters of this section. Xu Li, Liu Xin, Liu Xinliang, Zou Dongxi, Hu Mengxi, Lin Yanping.
GB/T 21437.2-2008/ISO 7637-2.2004
Electric disturbance caused by conduction and coupling of road vehicles
Part 2. Electrical Transient Conduction Along Power Lines
1 range
This section specifies the transmission of equipment on commercial vehicles installed in light commercial vehicles or 24V electrical systems for passenger cars and 12V electrical systems.
Bench tests for conducting transient electromagnetic compatibility tests include transient injection and measurement. This section also specifies the transient immunity failure mode
Severity classification.
This section applies to road vehicles of various power systems (such as spark ignition engines or diesel engines, or motors).
2 Normative references
The clauses in the following documents have been adopted as references in this part of GB/T 21437. Any quoted text
Each of its subsequent amendments (not including errata content) or revisions does not apply to this section. However, it is encouraged to reach agreements based on this section
The parties to the meeting studied whether the latest versions of these documents could be used. The most recent version of any referenced document that is not dated applies to this section.
GB/T 21437.1 Electrical disturbances caused by conduction and coupling on road vehicles Part 1. Definitions and general description
(GB/T 21437.1-2008, ISO 7637-1.2002, IDT);
3 Terms and Definitions
The terms and definitions established in GB/T 21437.1 apply to this section.
4 Test procedures
4.1 General requirements
The transient immunity test of the power line and the transient immunity test of the device involved in this part are all “bench test” in the test room.
get on. Some test methods require the use of artificial networks, providing comparable test results between laboratories. These methods can also be made
The basis for the development of the device and system, and can be used during the production phase (see Appendix B).
A bench test to evaluate the transient immunity of the device's power line can be performed using a test pulse generator, but this method does not
Cover all the various transients that may occur on the vehicle. The test pulse described in 5.6 is typical of a typical pulse. In special circumstances,
Additional test pulses. If a device is not affected by similar transients in the vehicle due to its function or connection status, some pulses can be ignored.
Vehicle manufacturers can define test pulses for specific devices.
Unless otherwise specified, the allowable error of the variable is ±10%.
4.2 Test temperature and test voltage
During the test, the ambient temperature should be 23 °C ± 5 °C. The test voltage shall comply with the provisions of Table 1. If this part of the content user
The consensus on the adoption of other values should be noted in the test report.
Table 1 Test voltage
Test voltage 12V system/V 24V system/V
UA 13.5±0.5 27±1
UB 12±0.2 24±0.4
Note 1. The test voltage when the UA is operating as a generator.
Note 2. UB is the test voltage when the battery is powered.
GB/T 21437.2-2008/ISO 7637-2.2004
4.3 Voltage Transient Emission Test
Tests for the Transient Conducted Emission of Automotive Electrical and Electronic Components of the DUT (Device Under Test) along the Battery Supply Line or the Switching Power Supply Line
Evaluation procedure, the DUT is a potential source of conducted disturbances, and the measurement arrangement must not be disturbed by the surrounding electromagnetic environment.
To regulate the load impedance of the DUT, an artificial network should be used to measure voltage transients from the disturbance source DUT (see 5.1). Sources of harassment
The artificial network is connected to a shunt resistor Rs (see 5.2), a switch S (see 5.3) and a power supply (see 5.4). As shown in Figure 1a) or Figure 1b). people
The unit is mm
a) Slow pulses (millisecond range or slower)
b) fast pulses (nanosecond to microsecond range)
1---oscilloscope or equivalent equipment;
2 --- voltage probe;
3 --- artificial network;
4---DUT (transient source);
5 --- ground plate;
6---Power;
7---ground wire; length less than 100mm.
Points A, B, and P are shown in Fig. 3.
Figure 1 Transient emission test layout
GB/T 21437.2-2008/ISO 7637-2.2004
All connection wiring between the industrial network, switch and DUT should be placed 50+10 0 mm above the metal ground plane. Cable length should follow
The actual use of the vehicle is selected, ie, the wiring should be able to withstand the operating current of the DUT, and after the vehicle manufacturer and supplier agree
determine.
If not specified in the test plan, the DUT shall be placed on a non-conductive material (material thickness 50+10 0 mm) above the ground plate.
When using a voltage probe (see 5.5.2) and an oscilloscope (see 5.5.1) or a waveform acquisition device (see 5.5.3) to measure the disturbance voltage,
Can be near the DUT's terminals [see Figure 1a) or Figure 1b)]. Repetitive transients should be measured when switch S is closed. If the transient is a power source
For disconnection, the measurement should be made when switch S is open. See Appendix C for evaluations and various values.
The DUT should be measured in open, closed, and various operating modes. The DUT should accurately work on the test meter
Specified in a row. Select the sampling rate and trigger level to obtain a waveform that shows the full transient width, with a sufficiently high resolution
Rate to show the maximum positive and negative parts of the transient. The DUT should be operated according to the test plan using the appropriate sampling rate and trigger level and recorded
Voltage amplitude. Other transient parameters such as rise time, fall time, and transient width should also be recorded. Unless otherwise specified,
Requires acquisition of 10 waveforms. Record the waveform that contains the largest positive amplitude and the largest negative amplitude (and the parameters associated with it).
According to Appendix C, evaluate the measured transients. All relevant information and test results should be recorded. If a test plan is required, it should include
Transient evaluation results related to the performance specifications specified in the test plan.
4.4 Transient Immunity Test
Transient immunity test of electrical/electronic devices shall be arranged according to Figure 2. For test pulses 3a and 3b, test pulse generator side
The wire between the port and the DUT should be placed parallel to the ground plane 50 + 10 0 mm above the length of 0.5m ± 0.1m.
With the DUT and resistor Rv disconnected, adjust the test pulse generator (see 5.6) to generate a specific pulse polarity, amplitude, width
Degrees and impedance. Select the appropriate value from Appendix A. Then connect the DUT to the pulse generator [see Figure 2b)] and disconnect the display
Wave device.
According to the actual situation, the function of the DUT can be evaluated during and/or after the application of the test pulse.
In order to accurately generate the required test pulse, the power supply needs to be turned on and off. If the test pulse generator comes with power, this conversion
The process can be completed by a test pulse generator.
One of the ways to simulate the waveform of an alternator with concentrated load dump suppression (see Figure 12) is to incorporate a suppression diode (or diode)
The bridge) is connected to the output terminals of the test pulse generator [see Figures 2a and 2b)]. Since individual diodes generally vary, there is
Can not withstand the large current generator, it is recommended to use a diode bridge layout [Figure 2c) example]. Use the same for test pulses 5a and 5b
Kind of pulse generator.
a) Pulse adjustment
Figure 2 Transient immunity test device
GB/T 21437.2-2008/ISO 7637-2.2004
b) Pulse injection c) Example of suppression diode bridge only for test pulse 5b
1---oscilloscope or equivalent equipment;
2 --- voltage probe;
3 --- test pulse generator with internal resistance Ri;
4---DUT;
5 --- ground plate;
6---ground line (maximum length of test pulse 3 is 100mm);
7---Resistance Rva;
8 --- Diode Bridge b.
a Load dump test pulses 5a and 5b for simulating vehicle system loads. When Rv is used, its size should be specified in the test plan (typical values are 0.7Ω
Between 40Ω).
b Used to simulate a pulse 5b of an alternator dump waveform with concentrated load dump suppression [see Figure 2c)].
c Increase the forward biased diode to achieve the maximum open circuit (suppression) voltage.
Figure 2 (continued)
Suppression diodes and suppression voltage levels (clamping voltages) used by different automotive manufacturers are non-standard, suppliers (component manufacturing
The manufacturer must obtain the diode and clamp voltage specification information from the manufacturer to complete the test. On the diode bridge, you need to add more
A single diode to provide a specific clamping voltage.
5 Test Equipment and Requirements
5.1 Artificial Network
Artificial networks replace the impedance of vehicle wiring harnesses and are used as reference standards in laboratories to determine the performance of equipment and electrical and electronic devices.
Figure 3 is a schematic diagram of a manual network.
Artificial networks should be able to withstand continuous loads consistent with DUT requirements.
Figure 4 shows the measured impedance between the P and B terminals when the A and B terminals are short-circuited in the case of an ideal electrical component |ZPB|
The value varies with frequency. In fact, the impedance of an artificial network should not deviate from the curve shown in Figure 4 by more than 10%.
If the artificial network has a metal shell, it should be placed flat on the ground plane. The ground of the power supply should be connected with the grounding plate, as shown in Figure 1a) and
1b) shows.
GB/T 21437.2-2008/ISO 7637-2.2004
A---power end;
B---common (can be grounded);
C---capacitor;
L---inductance;
P---DUT end;
R--- resistance.
The main features of various components.
L = 5μH (air core coil);
Internal resistance between P and A. < 5mΩ;
C = 0.1μF at.200V AC operating voltage and 1500V DC operating voltage;
R=50Ω.
Figure 3 Artificial network
5.2 Parallel Resistor R
The shunt resistor Rs (see Figure 1) is used to simulate the DC resistance of other electrical devices of the vehicle in parallel with the DUT. These electrical devices
The connection of the DUT is not controlled by the ignition switch. The selected Rs corresponds to the wiring harness between the disconnected ignition switch terminal and ground when the switch is opened.
The measured resistance should be determined by the vehicle manufacturer. Rs=40Ω should be used when there is no specific value. If you use wire wound
The resistance should be a double-wound resistor (ie, have a minimum reactance component).
In order to simulate the worst condition, Rs can be disconnected.
|ZPB|---Impedance in ohms (Ω);
Fig. 4 Impedance of frequency from 100犽H狕 to 100狕M狕|ZPB| as a function of frequency (short-circuit between terminal A and terminal B)
GB/T 21437.2-2008/ISO 7637-2.2004
5.3 Switch S
According to practical application, as shown in FIG. 1, the switch device S can be installed on any side of the artificial network. To measure fast transients
During the test, only one of the switching devices shown in FIG. 1 is actuated (contacts of the other switching devices should be closed). Before the test, it should be
The selected switchgear is stated in the t...