Unified diagnostic services

Example

Use in Lemonergy

Separate quantities from encoding and transport.

This is a reference concept. No executable Lemonergy block has been verified for this term.

Connected concepts

Related concepts from the knowledge graph. Connections show context, not cause and effect. Hover or focus a linked term for its definition.

CAN bus

The serial network over which a BMS talks to the vehicle or inverter: a two-wire differential bus, defined in ISO 11898, carrying short prioritised messages at up to 1 Mbit/s, or faster with CAN FD. Every node hears every message, and a dominant bit wins arbitration without any collision.

Diagnostic trouble code

A coded fault a controller stores when a check fails — a cell overvoltage, a sensor out of range, an isolation fault — with a status and often a snapshot of conditions when it occurred. Reading and interpreting DTCs is the first step of any battery root-cause analysis.

Electronic control unit

The general name for any controller on a vehicle network — BMU, VCU, CCU and motor controller are all ECUs. Each has its own address, firmware, diagnostic services and calibration data.

Flashing

Writing new firmware into a controller’s flash memory, normally through a bootloader that receives the image over CAN with UDS services. Image files come as Intel HEX, Motorola S-record or binary, often signed so the controller refuses unauthorised code.

ODX and PDX

The ASAM format that describes a controller’s diagnostics — its UDS services, data identifiers and trouble codes — so a diagnostic tester can talk to it; PDX is the packaged form. Vector’s CDD files play the same role in many supplier projects.

References & further reading

Further reading on this topic

These sources provide broader context; they are not presented as citations for every statement in this entry.

1. 3rd generation of the CAN data link layer

   CAN in Automation, CAN Newsletter · 2020

   Topic background · Classical CAN, CAN FD and CAN XL data-link concepts; publication describes the 2020 state.

2. Getting Started with the BQ76925

   Texas Instruments · 2019

   Topic background · A concrete BMS analog front-end example: cell voltage, current, temperature measurement and MCU integration.