1、raising standards worldwideNO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAWBSI Standards PublicationBS ISO 17458-1:2013Road vehicles FlexRaycommunications systemPart 1: General information and use casedefinitionBS ISO 17458-1:2013 BRITISH STANDARDNational forewordThis British S
2、tandard is the UK implementation of ISO 17458-1:2013. The UK participation in its preparation was entrusted to TechnicalCommittee AUE/16, Electrical and electronic equipment.A list of organizations represented on this committee can be obtained on request to its secretary.This publication does not pu
3、rport to include all the necessary provisions of a contract. Users are responsible for its correct application. The British Standards Institution 2013. Published by BSI Standards Limited 2013ISBN 978 0 580 76712 8 ICS 43.040.15 Compliance with a British Standard cannot confer immunity from legal obl
4、igations.This British Standard was published under the authority of the Standards Policy and Strategy Committee on 28 February 2013.Amendments issued since publicationDate T e x t a f f e c t e dBS ISO 17458-1:2013Reference numberISO 17458-1:2013(E)ISO 2013INTERNATIONAL STANDARD ISO17458-1First edit
5、ion2013-02-01Road vehicles FlexRay communications system Part 1: General information and use case definition Vhicules routiers Systme de communications FlexRay Partie 1: Information gnrale et dfinition de cas dutilisation BS ISO 17458-1:2013ISO 17458-1:2013(E) COPYRIGHT PROTECTED DOCUMENT ISO 2013 A
6、ll rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized in any form or by any means, electronic or mechanical, including photocopying and microfilm, without permission in writing from either ISO at the address below or ISOs member body in the country
7、 of the requester. ISO copyright office Case postale 56 CH-1211 Geneva 20 Tel. + 41 22 749 01 11 Fax + 41 22 749 09 47 E-mail copyrightiso.org Web www.iso.org Published in Switzerland ii ISO 2013 All rights reservedBS ISO 17458-1:2013ISO 17458-1:2013(E) ISO 2013 All rights reserved iii Contents Page
8、 1 Scope 1 2 Terms, definitions, symbols and abbreviated terms . 1 2.1 Terms and definitions . 1 2.2 Abbreviated terms . 4 3 Conventions . 4 4 Document overview . 4 4.1 General . 4 4.2 Document overview and structure 5 4.3 Open Systems Interconnection (OSI) model 5 4.4 Document reference according t
9、o OSI model 6 5 Use case overview and principles . 7 5.1 Basic principles for use case definition 7 5.2 Use case clusters 7 6 FlexRay communications system use case definition 8 6.1 UC 1 FlexRay processes . 8 6.2 UC 2 TT modes in clusters . 11 6.3 UC 3 Communication protocol . 17 6.4 UC 4 Electrical
10、 physical layer 20 BS ISO 17458-1:2013ISO 17458-1:2013(E) iv ISO 2013 All rights reserved Foreword ISO (the International Organization for Standardization) is a worldwide federation of national standards bodies (ISO member bodies). The work of preparing International Standards is normally carried ou
11、t through ISO technical committees. Each member body interested in a subject for which a technical committee has been established has the right to be represented on that committee. International organizations, governmental and non-governmental, in liaison with ISO, also take part in the work. ISO co
12、llaborates closely with the International Electrotechnical Commission (IEC) on all matters of electrotechnical standardization. International Standards are drafted in accordance with the rules given in the ISO/IEC Directives, Part 2. The main task of technical committees is to prepare International
13、Standards. Draft International Standards adopted by the technical committees are circulated to the member bodies for voting. Publication as an International Standard requires approval by at least 75 % of the member bodies casting a vote. Attention is drawn to the possibility that some of the element
14、s of this document may be the subject of patent rights. ISO shall not be held responsible for identifying any or all such patent rights. ISO 17458-1 was prepared by Technical Committee ISO/TC 22, Road vehicles, Subcommittee SC 3, Electrical and electronic equipment. ISO 17458 consists of the followi
15、ng parts, under the general title Road vehicles FlexRay communications system: Part 1: General information and use case definition Part 2: Data link layer specification Part 3: Data link layer conformance test specification Part 4: Electrical physical layer specification Part 5: Electrical physical
16、layer conformance test specification BS ISO 17458-1:2013ISO 17458-1:2013(E) ISO 2013 All rights reserved v Introduction The FlexRay communications system is an automotive focused high speed network and was developed with several main objectives which were defined beyond the capabilities of establish
17、ed standardized bus systems like CAN and some other proprietary bus systems. Some of the basic characteristics of the FlexRay protocol are synchronous and asynchronous frame transfer, guaranteed frame latency and jitter during synchronous transfer, prioritization of frames during asynchronous transf
18、er, single or multi-master clock synchronization, time synchronization across multiple networks, error detection and signalling, and scalable fault tolerance. The FlexRay communications system is defined for advanced automotive control applications. It serves as a communication infrastructure for fu
19、ture generation high-speed control applications in vehicles by providing: A message exchange service that provides deterministic cycle based message transport; Synchronization service that provides a common time base to all nodes; Start-up service that provides an autonomous start-up procedure; Erro
20、r management service that provides error handling and error signalling; Wakeup service that addresses the power management needs; Since start of development the automotive industry world-wide supported the specification development. The FlexRay communications system has been successfully implemented
21、 in production vehicles today. The ISO 17458 series specifies the use cases, the communication protocol and physical layer requirements of an in-vehicle communication network called “FlexRay communications system“. This part of ISO 17458 has been established in order to define the use cases for vehi
22、cle communication systems implemented on a FlexRay data link. To achieve this, it is based on the Open Systems Interconnection (OSI) Basic Reference Model specified in ISO/IEC 7498-1 and ISO/IEC 10731, which structures communication systems into seven layers. When mapped on this model, the protocol
23、and physical layer requirements specified by ISO 17458 are broken into: Diagnostic services (layer 7), specified in ISO 14229-1 3, ISO 14229-4 5; Presentation layer (layer 6), vehicle manufacturer specific; Session layer services (layer 5), specified in ISO 14229-2 4; Transport layer services (layer
24、 4), specified in ISO 10681-2 1; Network layer services (layer 3), specified in ISO 10681-2 1; Data link layer (layer 2), specified in ISO 17458-2, ISO 17458-3; Physical layer (layer 1), specified in ISO 17458-4, ISO 17458-5; in accordance with Table 1. BS ISO 17458-1:2013ISO 17458-1:2013(E) vi ISO
25、2013 All rights reserved Table 1 FlexRay communications system specifications applicable to the OSI layers Applicability OSI 7 layers ISO 17458 FlexRay communications system Vehicle manufacturer enhanced diagnostics Seven layer according to ISO 7498-1 and ISO/IEC 10731 Application (layer 7) vehicle
26、manufacturer specific ISO 14229-1, ISO 14229-4 Presentation (layer 6) vehicle manufacturer specific vehicle manufacturer specific Session (layer 5) vehicle manufacturer specific ISO 14229-2 Transport (layer 4) vehicle manufacturer specific ISO 10681-2 Network (layer 3) vehicle manufacturer specific
27、Data link (layer 2) ISO 17458-2, ISO 17458-3 Physical (layer 1) ISO 17458-4, ISO 17458-5 Table 1 shows ISO 17458 Parts 2 5 being the common standards for the OSI layers 1 and 2 for the FlexRay communications system and the vehicle manufacturer enhanced diagnostics. The FlexRay communications system
28、column shows vehicle manufacturer specific definitions for OSI layers 3 7. The vehicle manufacturer enhanced diagnostics column shows application layer services covered by ISO 14229-4 which have been defined in compliance with diagnostic services established in ISO 14229-1, but are not limited to us
29、e only with them. ISO 14229-4 is also compatible with most diagnostic services defined in national standards or vehicle manufacturers specifications. The presentation layer is defined vehicle manufacturer specific. The session layer services are covered by ISO 14229-2. The transport protocol and net
30、work layer services are specified in ISO 10681. BS ISO 17458-1:2013INTERNATIONAL STANDARD ISO 17458-1:2013(E) ISO 2013 All rights reserved 1 Road vehicles FlexRay communications system Part 1: General information and use case definition 1 Scope This part of ISO 17458 gives an overview of the structu
31、re and the partitioning of ISO 17458 and shows the relation between the different parts. In addition, it outlines the use case scenarios where the ISO 17458 series will be used. The terminology defined in this part of ISO 17458 is common for all FlexRay communication systems and is used throughout a
32、ll parts of ISO 17458. 2 Terms, definitions, symbols and abbreviated terms 2.1 Terms and definitions For the purposes of this document, the following terms and definitions apply. 2.1.1 active star AS active element which passes bus signals automatically from one input port to several output ports, w
33、here usually a passive net is plugged to each port NOTE1 An AS refreshes the bus signal slopes and levels; an AS does not refresh the bit-timing. NOTE2 An AS may be implemented in a monolithic way or a non-monolithic way. NOTE3 Optionally an AS may have a CC interface included. 2.1.2 branch componen
34、t within active star topologies NOTE A branch can be built from a point-to-point connection, a linear bus or a passive star. 2.1.3 bus driver BD physical interface between the CC and the wiring harness NOTE A BD is a mandatory FlexRay component that converts the data stream of the physical interface
35、 and supports the node with a power mode controlling optionally. 2.1.4 cable FlexRay transmission line. BS ISO 17458-1:2013ISO 17458-1:2013(E) 2 ISO 2013 All rights reserved 2.1.5 cluster communication system of multiple nodes connected via at least one communication channel directly (bus topology),
36、 by active stars (star topology) or by a combination of bus and star connections (hybrid topologies) NOTE Clusters can be coupled by gateways. 2.1.6 communication channel node connection through which signals are conveyed for the purpose of communication NOTE FlexRay allows a single CC to distribute
37、 data-frames independent from each other on two different hardware paths or topologies. From an abstract view each path is named “communication channel” (short: “channel“). The two channels are distinguished by using the extensions “A“ and “B“. 2.1.7 communication controller CC electronic component
38、in a node that is responsible for implementing the protocol aspects of the FlexRay communications system 2.1.8 communication element symbol and frame NOTE FlexRay distinguishes two types of communication elements which can be transmitted on the communication channel: symbols and frames. 2.1.9 commun
39、ication cycle one complete instance of the communication structure that is periodically repeated to comprise the media access method of the FlexRay system NOTE The communication cycle consists of a static segment, an optional dynamic segment, an optional symbol window, and a network idle time. Figur
40、e 1 illustrates the segmentation of a communication cycle during FlexRays normal operation. communication cycledynamic segmentstatic segmentsymbol windownetwork idle time. .timeFigure 1 Segmentation of a communication cycle during normal operation The static segment is configured into a selectable n
41、umber of static slots. The segmentation in the time domain is based on FlexRays distributed clock. FlexRay frames are transmitted synchronously during these static slots. The dynamic segment is configured into mini slots. They support prioritised event driven transmission of FlexRay frames. The symb
42、ol window is used to transmit FlexRay symbols which support e.g. wake-up of a FlexRay communication system. The network idle time is used for clock correction. BS ISO 17458-1:2013ISO 17458-1:2013(E) ISO 2013 All rights reserved 3 2.1.10 gateway node that is connected to two or more independent commu
43、nication networks that allows information to flow between the networks 2.1.11 host part of an ECU where the application software is executed, separated by the CHI from the FlexRay protocol engine NOTE The host offers interfaces which enable the application software to control the CC and the BD. 2.1.
44、12 hybrid topology design of a communication cycle using various topology components EXAMPLE An AS with one branch as point-to-point connection, one branch as linear bus and one branch as passive star. 2.1.13 passive net summary of all possible implementations of passive connections among FlexRay BD
45、s and Ass NOTE A passive summarizes all point-to-point connections, linear busses and passive stars. 2.1.14 physical layer BDs, ASs, CC I/O stages, cables, connectors, common mode filters, ESD protection circuits, termination networks etc. NOTE All timing relevant hard-ware components are included w
46、hich are needed to transfer communication elements among the protocol machines. 2.1.15 point-to-point two terminated FlexRay nodes which are linked by a single FlexRay cable without any stub 2.1.16 splice implementation of a connection-point where 3 or more transmission lines are plugged together. N
47、OTE A splice may contain passive components to damp radiation, e.g.a splice in a linear bus allows connecting a stub to a FlexRay node. 2.1.17 stub single FlexRay cable connected to the centre of a passive star or to a linear bus (short: plugged to a splice) NOTE1 A stub represents a component withi
48、n passive nets. A stub consists of a single FlexRay cable connected to the centre of a passive star or to a linear bus (short: plugged to a splice). NOTE2 The stub ends at the BD pins within an FlexRay node. 2.1.18 topology distributed FlexRay system which consists of several components like nodes,
49、busses, active and passive stars etc. NOTE The topology represents the non-hierarchical flat geometric structure of a FlexRay communication channel. BS ISO 17458-1:2013ISO 17458-1:2013(E) 4 ISO 2013 All rights reserved 2.1.19 wiring harness summary of all components inside the component “vehicle wiring harness” to transmit FlexRay communication elements NOTE The FlexRay wiring harness consists of connectors to plug ECUs, in-line connectors, cables, splices etc. 2.2
