Next Article in Journal
A 0.5 V 68 nW ECG Monitoring Analog Front-End for Arrhythmia Diagnosis
Next Article in Special Issue
Path Planning for Highly Automated Driving on Embedded GPUs
Previous Article in Journal
Multi-Vdd Design for Content Addressable Memories (CAM): A Power-Delay Optimization Analysis
Open AccessArticle

Energy Efficiency Due to a Common Global Timebase—Synchronizing FlexRay to 802.1AS Networks as a Foundation

Em­bed­ded Sys­tems for In­for­ma­ti­on Tech­no­lo­gy, Ruhr-University Bochum, 44780 Bo­chum, Germany
Author to whom correspondence should be addressed.
J. Low Power Electron. Appl. 2018, 8(3), 26;
Received: 12 July 2018 / Revised: 31 July 2018 / Accepted: 9 August 2018 / Published: 17 August 2018
(This article belongs to the Special Issue Automotive Low Power Technologies)
Modern automotive control applications require a holistic time-sensitive development. Nowadays, this is achieved by technologies specifically designed for the automotive domain, like FlexRay, which offer a fault-tolerant time synchronization mechanism built into the protocol. Currently, the automotive industry adopts the Ethernet within the car, not only for embedding consumer electronics, but also as a fast and reliable backbone for control applications. Still, low-cost but highly reliable sensors connected over the traditional Controller Area Network (CAN) deliver data needed for autonomous driving. To fusion the data efficiently among all, a common timebase is required. The alternative would be oversampling, which uses more time and energy, e.g., at least double the perception rates of sensors. Ethernet and CAN do require the latter by default. Hence, a global synchronization mechanism eases tremendously the design of a low power automotive network and is the foundation of a transparent global clock. In this article, we present the first step: Synchronizing legacy FlexRay networks to the upcoming Ethernet backbone, which will contain a precise clock over the generalized Precision Time Protocol (gPTP) defined in IEEE 802.1AS. FlexRay then could still drive its strengths with deterministic transmission behavior and possibly also serve as a redundant technology for fail-operational system design. View Full-Text
Keywords: Ethernet; FlexRay; 802.1AS; real-time Ethernet; FlexRay; 802.1AS; real-time
Show Figures

Figure 1

MDPI and ACS Style

Milbredt, P.; Schick, E.; Hübner, M. Energy Efficiency Due to a Common Global Timebase—Synchronizing FlexRay to 802.1AS Networks as a Foundation. J. Low Power Electron. Appl. 2018, 8, 26.

Show more citation formats Show less citations formats
Note that from the first issue of 2016, MDPI journals use article numbers instead of page numbers. See further details here.

Article Access Map by Country/Region

Back to TopTop