GB/T 41588.4-2022: Road vehicles - Controller area network(CAN) - Part 4: Time-triggered communication

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Scope

This Document specifies time-triggered communication in the controller area network (CAN):
a serial communication protocol that supports distributed real-time control and multiplexing for
use within road vehicles.
This Document is applicable to setting up a time-triggered interchange of digital information
between electronic control units (ECU) of road vehicles equipped with CAN; and specifies the
frame Synchronisation entity that coordinates the operation of both logical link and media
access controls in accordance with ISO 11898-1, to provide the time-triggered communication
schedule.
NOTE: Time-triggered CAN is a higher-level protocol layer additional to the CAN protocol itself, which
remains unchanged within the time-triggered communication. Time-triggered communication keeps the
latency time of each message at a specified value independent of the CAN bus load. Time-triggered CAN
ls implemented on two levels: Level 1 is restricted to the cyclic message transfer, while Level 2, in
addition, supports a global system time. Time-triggered CAN's cyclic, periodical communication is based
on reference messages transmitted by a time master. Each period starting with a reference message is
called a basic cycle and is subdivided into several time windows. The reference messages are used to
synchronize and calibrate the time bases of all nodes to the time master's time base, providing a global
time for the network. A mechanism is provided for alternative time masters to substitute for a failing time
master.

Basic Data

Standard ID	GB/T 41588.4-2022 (GB/T41588.4-2022)
Description (Translated English)	Road vehicles - Controller area network(CAN) - Part 4: Time-triggered communication
Sector / Industry	National Standard (Recommended)
Classification of Chinese Standard	T35
Word Count Estimation	35,343
Issuing agency(ies)	State Administration for Market Regulation, China National Standardization Administration