ZEVonUDS – OBD diagnostics now also for electric vehicles

ZEVonUDS – OBD diagnostics now also for electric vehicles

New Products |
By Christoph Hammerschmidt

The new diagnostic standard for vehicles, ZEVonUDS (aka SAE J1979-3), for the first time regulates on-board diagnostics (OBD) also for electric vehicles and plug-in hybrid electric vehicles (PHEVs). Therefore, the diagnostic tools have to be adapted. Vector Informatik has developed a directly applicable tool chain.

The SAE standards of the J1979 family describe how OBD data is read out of vehicles with an external diagnostic device (“scan tool”). This can be used to monitor functions in ECUs that have an impact on vehicle efficiency. The monitoring functions must be available regardless of whether emissions are caused directly by an internal combustion engine or indirectly by the generation of electricity to charge a traction battery in the vehicle. The new SAE J1979-3 standard extension is a subset of the UDS-based OnBoard Diagnostics introduced under SAE J1979-2 OBDonUDS. According to the SAE standard and the California Air Resources Board (CARB), all ZEVs and PHEVs will be required to support ZEVonUDS in the US market no later than model year 2028.

ZEVonUDS is being introduced to read out specific measurement data from electric vehicles with a scan tool in particular. This includes, for example, the Battery State-of-Health, which is used as a quantitative parameter in determining the residual value of an electric vehicle. CARB uses the SAE J1979-3 standard to record repairs on electric and plug-in hybrid vehicles registered for sale in California.

New challenges arise for both ECU software and diagnostic testers, especially for ZEV startups. These startups have not had to support on-board diagnostics in the past, but must now implement ZEVonUDS in a relatively short time frame. This requires a fundamental change in the ECU software. In addition, the new standard requires new development tools for specifying, testing and applying diagnostics.

Vector already offers an integrated tool chain for the new SAE standard ZEVonUDS. This supports all phases of development, from specification of the relevant OBD content with CANdelaStudio to implementation in ECU software with Microsar and its validation with CANoe.DiVa to application in the diagnostic tester (scan tool) with the Vector-product Indigo.

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