GB/T 21437.2-2008 in English

《GB/T 21437.2-2008道路车辆 由传导和耦合引起的电骚扰 第2部分：沿电源线的电瞬态传导》由TC114（全国汽车标准化技术委员会）归口，TC114SC29（全国汽车标准化技术委员会电子与电磁兼容分会）执行，主管部门为工业和信息化部。
本部分规定了安装在乘用车及１２Ｖ 电气系统的轻型商用车或２４Ｖ 电气系统的商用车上设备的传导电瞬态电磁兼容性测试的台架试验，包括瞬态注入和测量。本部分还规定了瞬态抗扰性失效模式严重程度分类。
本部分适用于各种动力系统（例如火花点火发动机或柴油发动机，或电动机）的道路车辆。

ChinaStandards.net is in charge of this English translation. In case of any doubt about the contents of English translation, the Chinese original shall be considered authoritative.

GB/T 21437 consists of the following parts, under the general title Road Vehicles — Electrical Disturbances from Conduction and Coupling:

— Part 1: Definitions and General Considerations;

— Part 2: Electrical Transient Conduction along Supply Lines Only;

— Part 3: Electrical Transient Transmission by Capacitive and Inductive Coupling Via Lines Other Than Supply Lines.

This part is Part 2 of GB/T 21437. It is identical with International Standard ISO 7637-2:2004 Road Vehicles — Electrical Disturbances from Conduction and Coupling — Part 2: Electrical Transient Conduction along Supply Lines Only.

Editorial changes are as follows: addition of the Notes of UA and UB in Table 1.

Annexes A, C and D of this part are normative, and Annexes B, E and F are informative.

This part was proposed by National Development and Reform Commission.

This part is under the jurisdiction of National Technical Committee of Auto Standardization.


Road Vehicles — Electrical Disturbances from Conduction and Coupling — Part 2: Electrical Transient Conduction along Supply Lines Only

1 Scope

This part specifies bench tests for testing the compatibility to conducted electrical transients of equipment installed on passenger cars and light commercial vehicles fitted with a 12 V electrical system or commercial vehicles fitted with a 24 V electrical system — for both injection and the measurement of transients. Failure mode severity classification for immunity to transients is also given in this part.

This part is applicable to these types of road vehicle, independent of the propulsion system (e.g. spark ignition or diesel engine, or electric motor).

2 Normative References

The following normative document contains provisions which, through reference in this text, constitute provisions of this part of GB/T 21437. For dated references, subsequent amendments to, or revisions of, any of these publications do not apply. However, parties to agreements based on this part are encouraged to investigate the possibility of applying the most recent edition of the normative document indicated below. For undated references, the latest edition of the normative document referred to applies.

GB/T 21437.1 Road Vehicles — Electrical Disturbances from Conduction and Coupling — Part 1: Definitions and General Considerations (GB/T 21437.1-2008, ISO 7637-1:2002, IDT);
ISO 8854:1988 Road Vehicles — Alternators with Regulators — Test Methods and General Requirements

3 Terms and Definitions

For the purpose of this document, the terms and definitions given in GB/T 21437.1 apply.

4 Test Procedure

4.1 General

These tests for measuring the transient emission on supply lines and the immunity of devices against such transients are called “bench tests”, made in the laboratory. The methods, some of which require the use of the artificial network, will provide comparable results between laboratories. They will also give the basis for the development of devices and systems, and may be used during the production phase (see Annex B).

A bench test method for the evaluation of the immunity of a device against supply line transients may be performed by means of a test pulse generator; this may not cover all types of transients which can occur in a vehicle. Therefore, the test pulses described in 5.6 are characteristic of typical pulses. In special cases, it could be necessary to apply additional test pulses. However, some pulses may be omitted if a device, depending on its function or its connection, is not influenced by comparable transients in the vehicle. It is the vehicle manufacturer's responsibility to define the test pulses required for a specific device.

Unless otherwise specified, a tolerance of ±10% applies to all variables used.

4.2 Test temperature and test voltage

The ambient temperature during the test shall be (23 ± 5)℃.
The test voltages shall be according to Table 1 unless other values are agreed upon by the users of this part, in which case such values shall be documented in test reports.

Table 1 Test Voltages
Test voltage 12 V system (V) 24 V system (V)
UA 13.5±0.5 27±1
UB 12±0.2 24±0.4
Note 1: UA is the test voltage when the generator is running.
Note 2: UB is the test voltage for battery operation.

4.3 Voltage transient emissions test

This subclause specifies a test procedure for evaluating the automotive electrical and electronic components of the device under test (DUT), considered a potential source of conducted disturbances, for conducted emissions of transients along the battery-fed or switched supply lines. Care shall be taken to ensure that the surrounding electromagnetic environment does not interfere with the measurement set-up.

Voltage transients from the disturbance source, the DUT, are measured using the artificial network to standardize the impedance loading on the DUT (see 5.1). The disturbance source is connected via the artificial network to the shunt resistor, Rs (see 5.2), the switch, S (see 5.3), and the power supply (see 5.4), as shown in Figure 1 a) or b). All wiring connections between artificial network, switch, and the DUT shall be spaced 500+10 mm above the metal ground plane. The cable sizes shall be chosen in accordance with the real situation in the vehicle, i.e. the wiring shall be capable of handling the operating current of the DUT, and as agreed between vehicle manufacturer and supplier.

Dimensions in millimeters

a) Slow pulses (millisecond range or slower)

b) Fast pulses (nanosecond-to-microsecond range)
1 — oscilloscope or equivalent;
2 — voltage probe;
3 — artificial network;
4 — DUT (source of transient);
5 — ground plane;
6 — power supply;
7 — Ground connection; length < 100 mm.
For A, B, P, see Figure 3.
Figure 1 Transient Emission Test Set-up

If no requirements are specified in the test plan, then the DUT shall be placed on a non-conductive material 500+10 mm above the ground plane.

The disturbance voltage shall be measured as close to the DUT terminals as possible [see Figure 1 a) or b], using a voltage probe (see 5.5.2) and an oscilloscope (see 5.5.1) or waveform acquisition equipment (see 5.5.3). Repetitive transients shall be measured with the switch S closed. If the transient is caused by a supply disconnection, measurement shall be started at the moment of opening switch S. For evaluation and values, see Annex C.

DUT operating conditions of particular interest in the measurements are the turn on, the turn off, and the exercising of the various operating modes of the DUT. The exact operating conditions of the DUT shall be specified in the test plan. The sampling rate and trigger level shall be selected to capture a waveform displaying the complete duration of the transient, with sufficient resolution to display the highest positive and negative portions of the transient. Utilising the proper sampling rate and trigger level, the voltage amplitude shall be recorded by actuating the DUT according to the test plan. Other transient parameters, such as rise time, fall time and transient duration, may also be recorded. Unless otherwise specified, ten waveform acquisitions are required. Only those waveforms with the highest positive and negative amplitude (with their associated parameters) shall be recorded.

The measured transient shall be evaluated according to Annex C. All pertinent information and test results shall be reported. If required per the test plan, include transient evaluation results with respect to the performance objective as specified in the test plan.

Foreword II
1 Scope
2 Normative References
3 Terms and Definitions
4 Test Procedure
5 Test Instrument Description and Specifications
Annex A (Normative) Failure Mode Severity Classification
Annex B (Informative) General Technique for Improving Device Electromagnetic Compatibility
Annex C (Normative) Transient Emissions Evaluation — Voltage Waveform
Annex D (Normative) Test Pulse Generator Verification Procedure
Annex E (Informative) Determination of Pulse Generator’s Energy Capability
Annex F (Informative) Origin of Transients in Road Vehicle Electrical Systems