Codeofchina.com 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
ICS 43.040.10 T 35 中华人民共和国国家标准 GB/T 21437.2—2008/ISO 7637—2：2004 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 Road vehicles—Electrical disturbances from conduction and coupling— Part 2：Electrical transient conduction along supply lines only (ISO 7637—2：2004，IDT) 2008-02-15发布 2008-09-01实施 中华人民共和国国家质量监督检验检疫总局 中国国家标准化管理委员会 发布 前言 GB/T 21437《道路车辆 由传导和耦合引起的电骚扰》包括三个部分： ——第1部分：定义和一般描述； ——第2部分：沿电源线的电瞬态传导； ——第3部分：除电源线外的导线通过容性和感性耦合的电瞬态发射。 本部分为GB/T 21437的第2部分，等同采用ISO 7637—2：2004《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》制定。 编辑性修改为：在表1中对UA、UB加注。 本部分附录A、附录C、附录D为规范性附录，附录B、附录E、附录F为资料性附录。 本部分由国家发展与改革委员会提出。 本部分由全国汽车标准化技术委员会归口。 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 1 范围 本部分规定了安装在乘用车及12 V电气系统的轻型商用车或24 V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。 2规范性引用文件 下列文件中的条款通过GB/T 21437的本部分的引用而成为本部分的条款。凡是标注日期的引用文件，其随后所有的修改单(不包括勘误的内容)或修订版均不适用于本部分。然而，鼓励根据本部分达成协议的各方研究是否可使用这些文件的最新版本。凡是不标注日期的引用文件，其最新版本适用于本部分。 GB/T 21437.1 道路车辆 由传导和耦合引起的电骚扰 第1部分：定义和一般描述(GB/T 21437.1—2008，ISO 7637—1：2002，IDT)； ISO 8854：1988道路车辆 带调节器的交流发电机 试验方法和一般要求 Road vehicles—Alternators with regulators—Test methods and general requirements 3术语和定义 GB/T 21437.1确立的术语和定义适用于本部分。 4试验规程 4.1 一般规定 本部分内容所涉及的电源线瞬态发射测量和装置的瞬态抗扰性试验均为“台架试验”，在试验室中进行。一些试验方法中要求使用人工网络，提供了试验室之间试验结果的可比性。这些方法还可以作为装置和系统的开发依据，并可在生产阶段使用(见附录B)。 评估装置的电源线瞬态抗扰性的台架试验，可以采用试验脉冲发生器的方法，但这种方法并没有涵盖所有可能出现在车辆上的各种瞬态，5.6所描述的试验脉冲只是典型脉冲的特性。在特殊情况下，可附加试验脉冲。如某装置因其功能或连接状况，而不受车辆内类似瞬态的影响，一些脉冲可以被忽略。车辆制造商可对特定的装置定义试验脉冲。 除非另有规定，变量允许误差为±10％。 4.2试验温度和试验电压 试验期间，周围环境温度应为23℃±5℃。试验电压应符合表1的规定。如果本部分内容使用者对采用其他值达成一致意见，在试验报告中应加以注明。 表1试验电压 试验电压 12 V系统/V 24 V系统/V UA 13.5±0.5 27±1 UB 12±0.2 24±0.4 注1：UA为发电机工作时的试验电压。 注2：UB为电池供电时的试验电压。
