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GB/T 28046 consists of the following parts under the general title Road Vehicles — Environmental Conditions and Testing for Electrical and Electronic Equipment:
— Part 1: General;
— Part 2: Electrical Loads;
— Part 3: Mechanical Loads;
— Part 4: Climatic Loads;
— Part 5: Chemical Loads.
This part is Part 2 of GB/T 28046.
This part is drafted in accordance with the rules given in the GB/T 1.1-2009
This part replaces GB/T 28046.2-2011 Road Vehicles — Environmental Conditions and Testing for Electrical and Electronic Equipment — Part 2: Electrical Loads. The following technical deviations have been made with respect to the GB/T 28046.2-2011 (the previous edition).
— addition of the voltage range of 18V to 32V for DC supply (see Table 2);
— improvement of the compliance criterion requirements of overvoltage test at room temperature for 12V system (see 4.3.1.2.3);
— addition of the "all voltage curves are shown without load"; and addition of the “actual vehicle wiring harness should be used for test wiring harness, which can also be determined by both parties through negotiation” (see 4.1);
— addition of the "severity 4", change of the "50 Hz to 20 kHz" to "50 Hz to 25 kHz", and updating of Figure 3 (see 4.4.2);
— addition of the “or in equal steps of not more than 25 mV” (see 4.5.2);
— deletion of the "within the supply voltage range specified in Table 1 or 2, the functional state shall reach Grade A" (see 4.5.3 of Edition 2011);
— addition of the relevant contents of load dump (addition of Figures 8 and 9, Tables 5 and 6, and the original Table 5 is extended to Table 7) (see 4.6.4);
— the requirement for functional status is raised from Class C to Class A (see 4.7.3);
— deletion of the requirements of grounding cut-off (for safety reasons) (see 4.10.2.1 of Edition 2011);
— modification of Figures 6 and 7, and addition of the description of physical quantities in the figures;
— modification of the plate thickness parameter in Table 3;
— addition of Annex A (Informative) Origin of Load Dump Pulse in Road Vehicles Electrical Systems and Annex B (Normative) Test Load Dump Pulse Generator Verification Procedure. The original Annex A is changed to Annex C.
This standard has been redrafted and modified adoption of International Standard ISO 16750-2:2012 Road Vehicles — Environmental Conditions and Testing for Electrical and Electronic Equipment — Part 2: Electrical Loads.
The structural adjustments have been made with respect to ISO 16750-2:2012:
— adjustment of the numbers of Annex A and Annex B to meet the compilation requirements of the standard;
— adjustment of the suspension segment under B.3 to B.3.1, and change the original B.3.1 to B.3.2.
The technical deviations between this standard and the International Standard ISO 16750-2:2012, together with their justifications, is given in below:
— The adjustment in "Normative References" of this part has technical deviations to meet the technical specification in China; the adjustment situations are embodied in a concentrated way in Clause 2 "Normative References" and the specific adjustments are as follows:
? IEC 16750-1 is replaced by GB/T 28046.1, which is modified from the international standard;
? ISO 16750-4:2006 is replaced by GB/T 28046.4-2011, which is modified in relation to international standard;
? ISO 8820 (all parts) is replaced by GB/T 31465 (all parts), and the degree of consistency between various parts of the two standards is as follows:
? GB/T 31465.1-2015 Road Vehicles — Fuse-link — Part 1: Definitions and General Test Requirements (ISO 8820-1:2008, MOD);
? GB/T 31465.2-2015 Road Vehicles — Fuse-link — Part 2: Users Guide (ISO 8820-2:2005, MOD);
? GB/T 31465.3-2015 Road Vehicles — Fuse-link — Part 3: Fuse-link with Blade Type (ISO 8820-3:2010, MOD);
? GB/T 31465.4-2015 Road Vehicles — Fuse-link — Part 4: Fuse-links with Female Contacts and Bolt-in Contacts (ISO 8820-4:2010, MOD);
? GB/T 31465.5-2015 Road Vehicles — Fuse-link — Part 5: Fuse-links with Axial Terminals (Strip Fuse-links) (ISO 8820-5:2007, MOD);
? GB/T 31465.6-2017 Road Vehicles — Fuse-link — Part 6: Fuse-links with Bolt-in Contacts with High Voltage (ISO 8820-8:2012, MOD);
? GB/T 31465.7-2017 Road Vehicles — Fuse-link — Part 7: Fuse-links with Shortened Tabs (ISO 8820-9:2014, MOD).
— addition of footnotes of Table 4 to make it easy to use and to meet the compilation requirements of the standard (see 4.6.3.2).
— the text of Annex A is not mentioned in the international standard. In order to meet the compilation requirements of the standard, "reasons for the occurrence are listed in Annex A" is added in 4.6.4.1.
— deletion of the notes and documents of of EMC in Scope, because this part does not include EMC (see Clause 1 and Bibliography of the ISO standard).
— deletion of the unreasonable provision in international standard, 4.5.3, “The functional status inside the supply voltage range (see Table 1 or Table 2) shall be Class A”.
— in order to improve operability, 4.1 added "test harness should be made by real vehicle harness, which can also be determined by both parties through negotiation".
— addition of the note “refer to GB/T 28046.1 for the definition of functional state class in each test requirement” in 4.1 to avoid repeated reference to GB/T 28046.1 in each subclause.
— it is more logical to move the calculation formula of internal resistance in 4.6.4.2.2 to 4.6.4.2.1.
— referring to 4.6.4, addition of the description "(see GB/T 28046.1)" of UA in 4.8.2.
— in order to avoid misunderstanding, deletion of the "Note: This is not a test for connectors." in international standard, 4.9, as there are many tests that are not applicable to connectors.
For the purposes of this part, the following editorial changes have also been made:
— to facilitate the viewing of the figure, the number in Figure 1 is directly converted to text, and the description of the number is deleted (see 4.4.2);
— addition of Annex C (Informative) to provide UL 94 applicable to automobiles for ease of understanding and implementation of the standard;
— simplify the header of Tables 5 and 6, and unify the presentation style of other tables.
This part was proposed by the Ministry of Industry and Information Technology of the People's Republic of China.
This part is under the jurisdiction of the National Technical Committee of Auto Standardization (SAC/TC 114).
The previous editions of this part are as follows:
— GB/T 28046.2-2011.
Road Vehicles — Environmental Conditions and Testing for Electrical and Electronic Equipment — Part 2: Electrical Loads
1 Scope
This part of GB/T 28046 describes the electrical environmental load of electrical and electronic equipment on/in the vehicle and specifies tests and requirements.
This part is applicable to electrical and electronic systems/components of M, N, O automobiles. Systems/components of Class L vehicle implemented in accordance with this part.
2 Normative References
The following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.
GB/T 28046.1 Road Vehicles — Environmental Conditions and Testing for Electrical and Electronic Equipment — Part 1: General (GB/T 28046.1-2011, ISO 16750-1:2006, MOD)
GB/T 28046.4-2011 Road Vehicles — Environmental Conditions and Testing for Electrical and Electronic Equipment — Part 4: Climatic Loads (ISO 16750-4:2006, MOD)
GB/T 31465 (all parts) Road Vehicles — Fuse-link [ISO 8820 (all parts)]
3 Terms and Definitions
For the purpose of this document, the terms and definitions given in GB/T 28046.1 apply.
4 Tests and Requirements
4.1 General
Measure all voltages at the effective input terminals of the device under test (DUT). All voltage curves are shown without load. The following tolerances shall apply:
— frequency and time: ±5%;
— voltages: ±0.2 V;
— resistance (10)
Actual vehicle wiring harness should be used for test wiring harness, which can also be determined by both parties through negotiation
Note: See GB/T 28046.1 for the definition of functional state class of each test requirement.
4.2 DC Supply voltage
4.2.1 Purpose
The purpose of this test is to verify equipment functionality at minimum and maximum supply voltage.
4.2.2 Test
Set the supply voltage as specified in Table 1 or Table 2 to all relevant inputs of the DUT.
Table 1 Supply voltage for system devices with 12 V nominal voltage
Code Minimum supply voltage, US min
V Maximum supply voltage, USmax
V
A 6 16
B 8 16
C 9 16
D 10.5 16
Table 2 Supply voltage for system devices with 24 V nominal voltage
Code Minimum supply voltage, US min
V Maximum supply voltage, USmax
V
E 10 32
F 16 32
G 22 32
H 18 32
4.2.3 Requirements
All DUT functions shall remain Class A, as defined in GB/T 28046.1, when tested in the supply voltage ranges given in Table 1 or Table 2, respectively.
4.3 Overvoltage
4.3.1 Systems with 12 V nominal voltage
4.3.1.1 Test at a temperature of Tmax -20℃
4.3.1.1.1 Purpose
This test simulates the condition where the generator regulator fails so that the output voltage of the generator rises above normal values.
4.3.1.1.2 Test
Heat the DUT in a hot air oven to Tmax-20℃. Apply a voltage of 18 V for 60 min to all relevant inputs of the DUT.
4.3.1.1.3 Requirement
The functional status for the DUT shall be minimum Class C as defined in GB/T 28046.1. Functional status shall be Class A where more stringent requirements are necessary.
4.3.1.2 Test at room temperature
4.3.1.2.1 Purpose
This test simulates a jump start.
4.3.1.2.2 Test
Ensure that the DUT has stabilized at room temperature. Apply a voltage of 24 V for (60 ± 6) s to all relevant inputs of the DUT.
4.3.1.2.3 Requirement
The functional status shall be minimum Class D as defined in GB/T 28046.1. Functional status shall be Class C where more stringent requirements are necessary.
4.3.2 Systems with 24 V nominal voltage
4.3.2.1 Purpose
This test simulates the condition where the generator regulator fails so that the output voltage of the generator rises above normal values.
4.3.2.2 Test at a temperature of Tmax -20℃
Heat the DUT in a hot air oven to Tmax-20℃. Apply a voltage of 36 V for 60 min to all relevant inputs of the DUT.
4.3.2.3 Requirements
The functional status for the DUT shall be minimum Class C as defined in GB/T 28046.1. Functional status shall be Class A where more stringent requirements are necessary.
Foreword II
1 Scope
2 Normative References
3 Terms and Definitions
4 Tests and Requirements
Annex A (Informative) Origin of Load Dump Pulse in Road Vehicles Electrical Systems
Annex B (Normative) Test Load Dump Pulse Generator Verification Procedure
Annex C (Informative) Test for Flammability of Plastic Materials for Parts in Devices and Appliances
Bibliography
