GB/T 28046.2-2019
Road vehicles—Environmental conditions and testing for electrical and electronic equipment—Part 2: Electrical loads (English Version)

Standard No.

GB/T 28046.2-2019

Language

Chinese, Available in English version

Release Date

2019

Published By

General Administration of Quality Supervision, Inspection and Quarantine of the People‘s Republic of China

Latest

GB/T 28046.2-2019

Replace

GB/T 28046.2-2011

Introduction

Analysis of the core content of the standard

GB/T28046.2-2019, as the second part of the series of standards for environmental testing of vehicle electrical and electronic equipment, focuses on standardizing the test methods and requirements related to electrical loads. Compared with the 2011 version, the new version of the standard has significant improvements in technical parameters and test methods:

Technical Dimensions	2011 Version	Changes in the 2019 Version
Voltage Range	Mainly 12V system	New 18V-32V gear (24V system)
Overvoltage test	12V system 24V/60s	Compliance criterion Upgraded from Class C to Class B
Frequency Range	50Hz-20kHz	Extended to 25kHz (Severity 4)

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Details of key test items

4.2 DC power supply voltage range

The standard specifies voltage codes for two power supply systems:

• 12V system: minimum voltage 6V-10.5V, maximum 16V
• 24V system: newly added 18V-32V gear to meet the needs of commercial vehicles

Test requirements: Within the range of Table 1/Table 2, the functional status of the equipment must reach Class A (no performance degradation).

4.6.4 Load dump test (new content)

Simulate the voltage shock when the generator load is suddenly disconnected:

• Added Figure 8/Figure 9 waveform definition and Table 5/Table 6 parameter matrix
• Function level requirement is raised from Class C to Class A
• Appendix A details the physical causes of load dump

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Comparative analysis of the new and old standards

Typical improvement case: In the 24V system overvoltage test, the 36V withstand voltage test time is extended from 30min to 60min, which is closer to the actual working conditions of heavy-duty vehicles. The test shows that the failure rate of a certain brand of ECU module dropped by 42% after the extended test.

Implementation Suggestions

1. Wiring harness selection: give priority to the use of real vehicle wiring harness (4.1 new clause)
2. Test equipment: must support 25kHz high-frequency ripple generation (4.4.2)
3. Document update: pay attention to the replacement relationship of referenced standards (GB/T31465 series replaces ISO8820)

GB/T 28046.2-2019 Referenced Document

• GB/T 28046.1-2011 Road vehicles.Environmental conditions and testing for electrical and electronic equipment.Part 1:General
• GB/T 28046.4-2011 Road vehicles.Environmental conditions and testing for electrical and electronic equipment.Part 4: Climatic loads
• ISO 16750-1:2006 Road vehicles - Environmental conditions and testing for electrical and electronic equipment - Part 1: General
• ISO 8820 Road vehicles - Fuse-links - Part 9: Fuse-links with shortened tabs (Type K)

GB/T 28046.2-2019 history

• 2019 GB/T 28046.2-2019 Road vehicles—Environmental conditions and testing for electrical and electronic equipment—Part 2: Electrical loads
• 2011 GB/T 28046.2-2011 Road vehicles.Environmental conditions and testing for electrical and electronic equipment.Part 2:Electrical loads

Standard and Specification

GB/T 28046.2-2019 -All Parts