Comparison of radiation immunity free field test difference between domestic and international automobile enterprises_Century Wisdom (Suzhou) Testing Technology Co., Ltd

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Comparison of radiation immunity free field test difference between domestic and international automobile enterprises

Release time:

2022-12-30 00:00

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　　The international standard of automotive electronic radiation immunity free field test is generally referred to ISO11452-2, which is also the common base standard for most automobile enterprises to refer to when formulating their own electromagnetic compatibility requirements. We first introduce ISO11452-2's common parts of RS free field test equipment, procedures and requirements. And then the special requirements of each automobile enterprise are listed and explained one by one.

　　ISO11452-2 Test layout:

　　1G以下(双锥天线正对线束中央)

　　Below 1G (logarithmic periodic antenna is right in the center of the harness)

　　Above 1G (horn antenna facing EUT)

　　Key points of ISO11452-2 test layout:

　　Ø The antenna is polarized horizontally and vertically
　　Ø The length of the harness along the table is 1.5 meters
　　Ø The center of the antenna below 1G is aligned with the center of the harness
　　Ø Above 1G antenna center alignment sample

　　(1) Let's start with the enterprise standard GMW3097:2019 of General Motors

　　3.4.2RI, anechoic room

　　Equipment

　　Ø The test device must meet 400MHz in ISO11452-1 and ISO11452-2 according to the following specifications... 2GHz regulations:
　　Ø You need to use alternative methods
　　Ø At 400MHz... In the frequency range of 1GHz, electromagnetic generating equipment (antenna) shall be treated as described in ISO11452-2.
　　Ø The frequency range is 1... 2GHz
　　Ø The field generator (antenna) points at the DUT and moves 0.75m in the direction parallel to the end in front of ground
　　Ø During calibration, the measuring device (field probe or antenna) is moved 0.75m in the direction parallel to the ground front end
　　Ø Horizontal and vertical antenna polarization is required
　　Ø The DUT is tested in at least three directions
　　Ø Forward power is used as a reference parameter for calibration purposes and during actual DUT testing

　　程序

　　Ø The test procedure shall meet 400MHz in ISO11452-1 and ISO11452-2 in accordance with the following specifications... 2GHz regulations:
　　Ø Use the test frequency specified in Table 10
　　Ø The load housing/simulator needs to be located in the test room
　　Ø With the exception of the radar L-band (1200 to 1400 MHZ), all modulation dwell times (i.e., the time the RF is applied) should be at least 2 s(unless otherwise specified in the test plan). Radar band residence time shall be at least 15 seconds (to provide (2) radar packet exposure)

　　Requirement

　　Ø The functional offset of the DUT may only be higher than the level specified in Table 12.
　　Ø Table 12: The required level of electromagnetic field immunity of test components and subsystems in anechoic chamber

Note 1. For level 1 functions, only instantaneous memory (<1s) and self-reset deviations above 100V/m are allowed. Level 1 functional testing does not allow airbag resetable deviation.

Note 2. For level 2 functions, deviations at or below 100 V/m are not allowed.

Note 3. The pulse field strength is required to be the peak V/m(maximum RMS) level

　　Radar pulse definition

　　Report:

　　Ø The test report should contain the following:
　　Ø A description of the functions that need to be monitored
　　Ø Any functional deviation
　　Ø Modulation state
　　Ø Immune threshold data
　　Ø Individual worst-case details (for each deviation), showing strength levels, including maximum field strength levels and thresholds and frequencies
　　Ø Test grade requirements should include all details
　　Ø The level of field strength for any device under test that has a limit value shall be determined
　　Ø Monitoring uses instruments and techniques

　　(2)Next, let's look at NIO-TP.20.007:2019, the enterprise standard of Nextev, a benchmark vehicle enterprise of new energy vehicles

　　Ø Test frequency range: 400MHz 2GHz
　　Ø The sample needs to be tested in three orthogonal vertical directions
　　Ø The dwell time is at least 2 seconds
　　Ø Test grade: See table below

　　Remarks：

　　Ø For level 2 functions, deviations below 300V/m should not occur;
　　Ø The pulse field intensity is required to be the peak V/m(maximum effective value) level.

　　Report

　　The following elements need to be included in the report:

　　Ø Function monitoring description
　　Ø Performance deviation
　　Ø Modulation mode
　　Ø Immunity threshold data
　　Ø A worst-case data with test grades and thresholds for each frequency
　　Ø Level of test requirements, including graphs
　　Ø Test grade limitations due to test instruments need to be clarified
　　Ø Monitoring instruments and techniques

　　(3) Let's look at GWT A D05-02:2017-07, the enterprise standard of Great Wall Motor, the leading SUV manufacturer in China

　　Ø Test frequency range: 200MHz-3.2GHz
　　Ø Test severity, frequency range and modulation mode are shown in Table 25
　　Ø Test severity levels are shown in the table below:

　　Ø ALSE radiation immunity test arrangement for high voltage parts

1 -- ESA (ground, as required by the test plan); 2 -- low pressure harness; 3 -- LV simulation load; 4 -- Power supply (location optional); 5 -- LV Artificial Network (AN); 6 -- ground plane (connected to the shield); 7 -- low relative dielectric constant support (εr≤1.4); 8 -- horn antenna; 10 -- High quality coaxial cable, such as double shield (50 Ω); 11 -- wall panel connector; 12 -- measuring instrument; 13 -- RF absorbing material; 14 -- Simulation and monitoring systems; 15 -- HV harness; 16 -- HV load simulator; 17——HV AN; 18 -- HV power supply; 19 -- HV feed in; 25 -- AC/DC charging harness; 26 -- AC/DC analog load (such as PLC); 27 -- 50 uH linear impedance stabilized network (LISN)(AC) or HV AN(DC);

28 -- AC/DC power supply; 29 -- The AC/DC is fed in

　　Ø Radar wave test layout

　　1——DUT; 2 -- test harness; 3 -- simulated load; 4 -- Power supply (location optional); 5 -- insulation support with dielectric constant εr≤1.4; 6 -- transmitting antenna; 7 -- simulation and monitoring system; 8 -- High quality double shielded coaxial cable (50 Ω); 9 -- wall panel connector; 10 -- RF signal generator and amplifier; 11 -- RF absorbing material

　　(4) Next, let's look at the enterprise standard TL81000_2018_03-EN of Volkswagen, a well-known German auto company

　　Ø Test frequency range

Mandatory: 200 MHz to 3 400 MHz

Selected test: 3 400 to 6 000 MHz

　　Ø Test grade: See table below

　　Remarks:

　　A：Must test

　　B：Selective measurement

　　Ø Performance index

　　(5)Next, let's look at the corporate standard of Ford Motor, the old American car company

　　Ø 12.6 Requirements: 360-3100 MHz: RI 114

　　Remarks:

　　1.Pulse modulation is limited to 400 -- 470 MHz. CW and AM modulation is applicable to the entire frequency band (360-806MHz).

　　2.The 600 V/m requirement applies only to selected components (such as externally mounted sensors). Contact FMC EMC for specific applicability

　　Ø Radar wave setup

2. Test the wiring harness

3. Load simulator 4. Car battery

5. Dielectric support (r ≤1.4) 6. Transmitting antenna

8. Double-shielded coaxial cable (e.g. RG 223)

9. Partition board connector 10. Rf generation device

11. Radio frequency absorber materials

　　(6)Finally, let's look at the enterprise standard MES PW 67602D of Mazda, a well-known Japanese auto company

　　Ø Test frequency range: 200 to 6,000 MHz
　　Ø Test grades are shown in the table below:

　　Remarks:

(1) Class B shall be selected unless any test severity class is specified on the specification drawings.

(2) Only vertical polarization is performed.

(3) The 600 V/m requirement applies only to selected components mounted outside the metal body of the vehicle (such as airbag systems and radar front impact sensors). Contact responsible Mazda Engineering Department for specification application.

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