Electronic control unit

Example

Use in Lemonergy

Separate quantities from encoding and transport.

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Connected concepts

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Battery management unit

The master controller of a battery management system: it collects cell voltages and temperatures from the monitoring boards, runs the state estimation and protection logic, drives the contactors and talks to the vehicle. In some architectures the same name is used for a per-module slave, so a datasheet’s block diagram is the safe reference.

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.

Charging control unit

The vehicle-side controller that manages charging: it detects the plug, talks to the charging station over the control pilot or ISO 15118 and DIN 70121, and passes the current and voltage limits the BMS allows. In some bus and truck architectures CCU also names a central or cluster control unit, so the system diagram decides.

Unified diagnostic services

The standard diagnostic protocol of vehicle controllers, ISO 14229: services to read data and fault codes, run routines, change sessions and flash firmware. A service tool talks UDS to the BMU over CAN to read cell data, clear faults or update software.

Vehicle control unit

The supervisory controller of an electric vehicle: it interprets the driver’s demand, asks the motor controller for torque and the BMS for the power it may give, and decides when the high-voltage system may switch on. The BMS reports to it, usually over CAN.

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.