Method for ensuring time synchronization in server ECU

Abstract

A method for ensuring time synchronization in a server ECU wherein the time synchronization is performed according to a time synchronization criterion, the method comprising:-initializing the time synchronization of components; storing a unique clock identification of the highest-level clock determined during initialization in each of the components of the server ECU that do not provide the previously determined highest-level clock; identifying a shadow controller of a component selected from the server ECUs; -sending the synchronization message; querying the shadow controller for the issue time; inserting a time in the subsequent message by the controller forming the highest-level clock, and retransmitting the time; and sending, by the selected network device that does not provide the previously determined highest-level clock, an additional time synchronization related message, according to the invention, the time information transmitted in the additional time synchronization-related message and the clock parameters and domain numbers, which are important for the determination of the optimal clock by means of the BMCA, are consistent with or similar to the time information and clock parameters and domain numbers of the previously determined highest-level clock, these additional time synchronization related messages contain a unique clock identity corresponding to the identity of the respective selected network device.

Description

technical field [0001] The present invention relates to a communication network with mutually synchronized network devices. Background technique [0002] Ethernet technologies are increasingly being used in vehicles where they are replacing older or proprietary data connections and data buses. On layer 3 of the OSI layer model, Ethernet connections support a number of switching protocols to transfer packets between transmitters and receivers. In the higher protocol layers, the data flow is split into packets, process communication is carried out between communicating systems, the data is converted into a system-independent form, and finally the functionality is provided to the application. [0003] Almost all Ethernet communication networks used in vehicles use a time synchronization related protocol that provides a global network time base that is synchronized across all network devices. The penetration rate of time synchronization network devices is expected to continue ...

AI Technical Summary

Problems solved by technology

[0014] However, to date, none of the known applications has addressed the question of how simple means can be used to protect state-of-the-art timekeeping devices from attack without losing basic compliance with the IEEE 802.1AS standard

Images