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Overview of General Motors’ Global EMC Specifications

Overview of General Motors’ Global EMC Specifications. Southeastern Michigan IEEE-EMC “Automotive Tuesdays” (Rev 1) September 26, 2000. Agenda. Opening Remarks & Introductions - Mark Steffka . . . . . . . . . . . . . 5 min

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Overview of General Motors’ Global EMC Specifications

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  1. Overview of General Motors’ Global EMC Specifications Southeastern Michigan IEEE-EMC “Automotive Tuesdays” (Rev 1) September 26, 2000

  2. Agenda • Opening Remarks & Introductions - Mark Steffka . . . . . . . . . . . . . 5 min • EMC Overview (History & GMW Migration) - Mark Steffka . . . . 10 min • Vehicle EMC - A Brief Synopsis - Victor Lau . . . . . . . . . . . . . . . . . 10 min • Component EMC Requirements & Methods - Don Seyerle . . . . . . . 50 min • Component EMC Assurance Process - Victor Lau . . . . . . . . . . . . . . . 5 min • Wrap-Up - Victor Lau . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 min Notes: • A break may be included during the Component section • Questions during the presentations are encouraged

  3. Why Are We Here Today? GM has requirements for Electromagnetic Compatibility (EMC) as a part of the vehicle development process • These requirements have “gone global” in the form of GM Worldwide (GMW) EMC specifications • Past GM North America (GMNA requirements/methods being phased-out • Vehicle: GMNA VTS and EMC-xx GMUTS procedures • Component: GM91xxP

  4. Why Have EMC Requirements? • Customer Satisfaction/Safety - electronics can/do react to electromagnetic energy • Legislation: • International programs - certified compliance to European Community automotive EMC regulation (95/54 EC, known as EC’96) • Canada - certified compliance for radiated emissions • U.S. programs - voluntarycompliance & self-vigilance only) • Contractual: Texas Dept. of Transportation fleet sales

  5. EMC Timeline

  6. Migration Toward GMW • Benefits • Structure of the specifications • Issues in the development

  7. Benefits of GMW • Establishes common requirements and methods for GM Worldwide • Avoids duplication of validation for international parts/programs • Enables global sourcing • supplier-base not regionalized • higher parts volumes

  8. GMW 3091 GS GMI 12559 VTS ¶’s Applicable GMUTS for EMC-xx GMI 12559 GMW 3094 GS GMW 3097 GS GMW 3100 GS General Motors’ EMC Specifications Limited in GMI 12559 GM91xxP

  9. Some Significant GMW Issues • Supplier Responsibility • Vehicle Radiated Immunity Requirements • Vehicle Radiated Immunity Method

  10. “The Device Under Test shall passboth, the component level . . . and the vehicle level tests . . . In the event that a device passes the component level . . . but does not pass the vehicle level . . ., the vehicle level test results will be the determining factor for validation test pass/fail status.” (Source: GMW 3097 GS) GMW Supplier Responsibility:

  11. Immunity Requirements: GMNA Functional Status Classifications (FSC) & Regions of Performance (similar to GMIO’s Categories & Regions) -vs- 2-Level GMW Method

  12. GMNA FSC - Categorize functions into classes based on their relative importance to the operation and control of the vehicle

  13. GMNA Regions of Performance - Define how a function is allowed to behave during and after exposure to a disturbance level

  14. GMNA FSC & Regions of Performance Increasing disturbance level (V/m, voltage, etc.)

  15. Issues with FSC & Regions • Every function of each DUT had to be classified (not always done) • Region of performance as judged at component-level may underestimate vehicle-level performance ex: loss of crank sensor signal during exposure to RF

  16. Judged performance during component test: Region II (self-recovers) 100 mA Deviation threshold @ component test • Correct Component Performance: Region III (possible engine stall - operator reset required) • FAIL 0 mA • PASS Example: Loss of Crank Sensor Signal During Exposure to RF • Performance in Vehicle: Region III (possible engine stall - operator reset required)

  17. Increasing disturbance level (V/m,V,mA, etc.) GMW 2-Level System

  18. GMW Table 1

  19. Increasing disturbance level (V/m,V,mA, etc.) GMW 2-Level System

  20. Vehicle Radiated Immunity Methods GMNA Feedback -vs- GMIO Substitution

  21. GMNA Feedback MethodNote: Available in International (ISO) and National (SAE) Standards

  22. GMIO Substitution MethodNote: Available in International (ISO) and National (SAE) Standards

  23. GMIO Substitution MethodNote: Available in International (ISO) and National (SAE) Standards

  24. Decision: GMW = Substitution • Consistent with survey data (no vehicle present, typically) • Common with • GMIO (Opel, SAAB, GM Holden, GM do Brazil, Isuzu, GM-South Africa) • Other domestic & foreign vehicle manufacturers • Legislated (95/54 EC) • Standards (ISO/SAE)

  25. Outline • EMC Overview • Vehicle Test Synopsis - GMW • Component Requirements/Methods : GMW -vs- GMNA • Component EMC Acceptance Process • Wrap-Up

  26. Radiated Immunity (RI) Vehicle EMC (GMW) EMC Radiated Conducted Radiated Emissions (RE) Conducted Immunity (CI) Conducted Emissions (CE) Electrostatic Discharge (ESD)

  27. GMW Vehicle RI

  28. EMC Radiated Conducted Radiated Immunity (RI) Radiated Emissions (RE) Conducted Immunity (CI) Conducted Emissions (CE) Electrostatic Discharge (ESD) Vehicle EMC (GMW)

  29. GM Definition of Broadband and Narrowband Sources for RE • Except for Type Approval, GM uses a definition for broadband sources that simplifies data interpretation • Broadband Sources = “Arc & Spark” sources only (e.g. noise created by an arcing process) (Ex: DC brush motors, ignition systems, etc.) • Narrowband Sources = everything else (Ex: P clock harmonics, PWM, etc.)

  30. GMW Vehicle RE

  31. EMC Radiated Conducted Radiated Immunity (RI) Radiated Emissions (RE) Conducted Immunity (CI) Conducted Emissions (CE) Electrostatic Discharge (ESD) Vehicle EMC (GMW)

  32. Vehicle CI/CE Test Descriptions

  33. Vehicle EMC (GMW) EMC Radiated Conducted Radiated Immunity (RI) Radiated Emissions (RE) Conducted Immunity (CI) Conducted Emissions (CE) Electrostatic Discharge (ESD)

  34. Vehicle ESD • Perform AIR discharges, as well as DIRECT CONTACT (if possible) • Discharge to all occupant-accessible points • Displays • Switches • Shafts • ALDL pins • other

  35. Outline • EMC Overview • Vehicle Test Synopsis - GMW • Component Requirements/Methods : GMW -vs- GMNA • Component EMC Acceptance Process • Wrap-Up

  36. Component EMC THEN (GM91xxP) and NOW (GMW)

  37. Radiated Immunity (RI) Component EMC (Then & Now) EMC Radiated Conducted Radiated Emissions (RE) Conducted Immunity (CI) Conducted Emissions (CE) Electrostatic Discharge (ESD)

  38. GMW Component RI Setup (BCI)

  39. Component RI - Part I THEN NOW Type of Test Bulk Current Injection Bulk Current Injection Per GMW ¶ 3.2.1.2.2. - uses ISO 11452-4 (BCI method with closed-loop leveling) Methodology Per GM9112P 1 - 500 MHz (@ 20 steps/octave) 1 - 400 MHz (w/ specific frequencies in spec) Frequency Basis for Requirements 2-Level System FSC & Regions of Performance

  40. GMW BCI Requirements GM9112P GMW (Rev 1)

  41. GMW Component RI Setup (Reverb) Mode-Stirrer

  42. GMW Component RI Setup (Anechoic)

  43. Component RI - Part II THEN NOW Reverberation Note: Direct radiation in anechoic chamber permitted as an exception (subject to yearly review) Type of Test Reverberation Per GMW ¶ 3.2.1.2.1. - uses SAE 1113/27 or ISO 11452-2 (anechoic method) Methodology Per GM9120P 400 - 9570 MHz (w/ specific frequencies in spec) 500 - 2000 MHz (@ 25 steps/octave) Frequency Basis for Requirements FSC & Regions of Performance 2-Level System

  44. GMW Reverb Requirements GM9120P GMW (Rev 1)

  45. GMW Component RI Setup (H-Field)

  46. Component RI (H-Field) THEN NOW Type of Test Helmholtz Coils Helmholtz Coils Per GMW ¶ 3.2.1.2.3. - uses SAE 1113/22 (Magnetic Field) Methodology Per GM9113P Frequency 60 Hz 16 2/3, 50, 60, 150, 180 Hz Basis for Requirements FSC & Regions of Performance Single Compliance Level

  47. GMW H-Field Requirements GM9113P GMW

  48. EMC Radiated Conducted Radiated Immunity (RI) Radiated Emissions (RE) Conducted Immunity (CI) Conducted Emissions (CE) Electrostatic Discharge (ESD) Component EMC (Then & Now)

  49. GMW Component RE Setup (Reverberation) Mode-Stirrer

  50. GMW Component RE Setup (Anechoic)

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