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1、 Reference number ISO 11992-2:2003(E) ISO 2003 INTERNATIONAL STANDARD ISO 11992-2 Second edition 2003-04-15 Road vehicles Interchange of digital information on electrical connections between towing and towed vehicles Part 2: Application layer for brakes and running gear Vhicules routiers change dinf
2、ormations numriques sur les connexions lectriques entre vhicules tracteurs et vhicules tracts Partie 2: Couche dapplication pour les quipements de freinage et les organes de roulement -,-,- ISO 11992-2:2003(E) PDF disclaimer This PDF file may contain embedded typefaces. In accordance with Adobes lic
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5、een taken to ensure that the file is suitable for use by ISO member bodies. In the unlikely event that a problem relating to it is found, please inform the Central Secretariat at the address given below. ISO 2003 All rights reserved. Unless otherwise specified, no part of this publication may be rep
6、roduced 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 of the requester. ISO copyright office Case postale 56 CH-1211 Geneva 20 Tel. + 41 22
7、 749 01 11 Fax + 41 22 749 09 47 E-mail copyrightiso.org Web www.iso.org Published in Switzerland ii ISO 2003 All rights reserved -,-,- ISO 11992-2:2003(E) ISO 2003 All rights reserved iii Contents Page Forewordiv Introduction v 1 Scope1 2 Normative references .1 3 Terms and definitions.1 4 Abbrevia
8、tions 1 5 General specifications2 6 Application layer .2 6.1 Message frame format2 6.2 Address assignment.4 6.3 Message routing7 6.4 Parameters.8 6.5 Messages.28 7 Conformance tests36 7.1 General.36 7.2 Conformance tests for commercial vehicles .36 7.3 Conformance tests for towed vehicles.37 Annex A
9、 (informative) Parameter identification form .39 Bibliography .41 -,-,- ISO 11992-2:2003(E) iv ISO 2003 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 Internationa
10、l Standards is normally carried out 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,
11、also take part in the work. ISO collaborates 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 commi
12、ttees is to prepare International 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 po
13、ssibility that some of the elements 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 11992-2 was prepared by Technical Committee ISO/TC 22, Road vehicles, Subcommittee SC 3, Electrical and electronic equipment.
14、 This second edition cancels and replaces the first edition (ISO 11992-2:1998), reviewed in the light of changing legislative requirements and which has been technically revised. ISO 11992 consists of the following parts, under the general title Road vehicles Interchange of digital information on el
15、ectrical connections between towing and towed vehicle: Part 1: Physical layer and data-link layer Part 2: Application layer for brakes and running gear Part 3: Application layer for equipment other than brakes and running gear Part 4, Diagnostics, is under preparation. -,-,- ISO 11992-2:2003(E) ISO
16、2003 All rights reserved v Introduction This part of ISO 11992 is subject to additions which will become necessary in order to keep pace with experience and technical advances. Care has been taken to ensure that these additions can be introduced in a compatible way, and care will have to be taken in
17、 the future so that such additions remain compatible with previous versions. In particular, it may become necessary to standardize new parameters and parameter groups. ISO members can request that such new parameters and parameter groups be included in future editions of ISO 11992 by completing the
18、Parameter identification form in Annex A and submitting it to ISO/TC 22/SC 3. -,-,- -,-,- INTERNATIONAL STANDARD ISO 11992-2:2003(E) ISO 2003 All rights reserved 1 Road vehicles Interchange of digital information on electrical connections between towing and towed vehicles Part 2: Application layer f
19、or brakes and running gear 1 Scope This part of ISO 11992 specifies the parameters and messages for electronically controlled braking systems, including ABS (anti-lock braking systems) and for running gear equipment (i.e. systems for steering, suspension and tyres), to ensure the interchange of digi
20、tal information between road vehicles with a maximum authorized total mass greater than 3 500 kg, and their towed vehicles, including communication between towed vehicles. The objective of the data structure is to optimize the use of the interface, while preserving a sufficient reserve capacity for
21、future expansion. 2 Normative references The following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies. ISO 1189
22、8:19931), Road vehicles Interchange of digital information Controller area network (CAN) for high-speed communication ISO 11992-1, Road vehicles Interchange of digital information on electrical connections between towing and towed vehicles Part 1: Physical layer and data-link layer 3 Terms and defin
23、itions For the purposes of this document, the terms and definitions given in ISO 11992-1 apply. 4 Abbreviations ABS Anti-lock Braking System ASR Anti Spin Regulation (traction control system) CAN Controller Area Network 1) Amended in 1995. Under revision. -,-,- ISO 11992-2:2003(E) 2 ISO 2003 All rig
24、hts reserved DA Destination Address DP Data Page EBS Electronically controlled Braking System ECU Electronic Control Unit GE Group Extension MSB Most Significant Byte P Priority PDU Protocol Data Unit PF PDU Format PGN Parameter Group Number PS PDU Specific R Reserved RGE Running Gear Equipment ROP
25、Roll Over Prevention SA Source Address VDC Vehicle Dynamic Control YC Yaw Control 5 General specifications The data link and the physical layer shall be in accordance with ISO 11992-1. To minimize bus loading on the towing/towed vehicle interface, appropriate messages are specified. These messages m
26、ay be filtered by a device (node) on each vehicle that shall also provide address assignment and electrical isolation from the in-vehicle subnetwork. The architecture was chosen to allow any combination of new and old towing and towed vehicles. Multiple towed vehicles can be connected in any combina
27、tion; the network shall be capable of addressing any towed vehicle, including dollies. The truck operator can disconnect and connect towed vehicles at any time and any order and the network shall adjust and respond accordingly. 6 Application layer 6.1 Message frame format 6.1.1 General The applicati
28、on layer provides a string of information that is assimilated into a protocol data unit (PDU). The PDU provides a framework for organizing the information which will be sent by the CAN data frame. The 29 bit identifier shall be in accordance with ISO 11898. The PDU shall consist of seven fields in a
29、ddition to the specific CAN fields (see Figure 1). -,-,- ISO 11992-2:2003(E) ISO 2003 All rights reserved 3 The PDU fields are Priority (P), Reserved (R), Data Page (DP), PDU Format (PF), PDU Specific (PS) which can be a Destination Address (DA) or a Group Extension (GE) Source Address (SA) and data
30、 field. Figure 1 29-bit CAN identifier 6.1.2 Priority The three priority bits are used to optimize message latency for transmission onto the bus only. They shall be globally masked off by the receiver (ignored). The priority of any message may be set from highest, 0 (0002), to lowest, 7 (1112). The
31、default for all control oriented messages is 3 (0112). The default of all other informational messages is 6 (1102). 6.1.3 Reserved bit (R) The reserved bit is reserved for future expansion. This bit shall be set to zero for transmitted messages. 6.1.4 Data page (DP) The DP bit selects an auxiliary p
32、age of parameter group descriptions. 6.1.5 PDU format (PF) The PF field is an eight-bit field that determines the PDU format and is one of the fields used to determine the parameter group number assigned to the data field. Parameter group numbers shall be used to identify or label a set of commands
33、and data. 6.1.6 PDU specific (PS) 6.1.6.1 General The PDU-specific field is an eight-bit field and depends on the PDU format. Depending on the PDU format, it can be a destination address or a group extension. If the value of the PDU format (PF) field is below 240, then the PDU-specific field is a de
34、stination address. If the value of the PF field is 240 to 255, then the PDU-specific field contains a group extension (GE) value (see Table 1). Table 1 PDU-specific field PDU format (PF) field PDU-specific (PS) field PDU 1 field 0 to 239 Destination address PDU 2 field 240 to 255 Group extension 6.1
35、.6.2 Destination address (DA) The DA field contains the specific address of the towing or towed vehicle to which the message is being sent. The global destination address (255) requires all devices to listen. -,-,- ISO 11992-2:2003(E) 4 ISO 2003 All rights reserved 6.1.6.3 Group extension (GE) The G
36、E field, in conjunction with the four least significant bits of the PDU format field provide for 4 096 parameter groups per data page. When the four most significant bits of the PDU format field are set, it indicates that the PS field is a group extension. 6.1.7 Source address (SA) The SA field is e
37、ight bits long. There shall only be one device on the network with a given SA. Therefore, the SA field assures that the CAN identifier will be unique, as required by CAN. 6.1.8 Data field A single CAN data frame provides a maximum of eight data bytes. All eight bytes shall be used, even if fewer tha
38、n eight bytes are required for expressing a given parameter group number. This provides a means to easily add parameters, while remaining compatible with previous revisions which only specify part of the data field. 6.1.9 Parameter group number (PGN) The PGN is a 24-bit number which contains: Reserv
39、ed bit, Data page bit, PDU Format field (eight bits) and PDU-specific field (eight bits) (see Table 2). If the PF value is less than 240 (F016; PDU 1 type message), then the lowest byte of the PGN is set to zero. Table 2 Content of the parameter group number Byte 1 (MSB) Byte 2 Byte 3 Bits 8 .3 Bit
40、2 Bit 1 0000002 Reserved Data Page PDU format PDU-specific 6.1.10 PDU 1 format The PDU 1 format allows for applicable messages to be sent to either a specific or global destination. PDU 1 format messages are determined by the PF field. When the messages PF field value is 0 to 239, the message is a P
41、DU 1 format. 6.1.11 PDU 2 format The PDU 2 format may only be used to communicate global messages. PDU 2 format messages are those where the PF value is equal to 240 to 255. 6.2 Address assignment A road train consists of one commercial vehicle and one or more towed vehicles. Dolly axles within the
42、road train are treated as additional towed vehicles (see Figure 2). The commercial vehicle is the towing vehicle of towed vehicle #1, towed vehicle #1 is the towing vehicle of towed vehicle #2 and so on. -,-,- ISO 11992-2:2003(E) ISO 2003 All rights reserved 5 Key 1 towed vehicle: position #1 2 towe
43、d vehicle: position #2 3 towed vehicle: position #3 4 commercial vehicle Figure 2 Example of possible road train configuration The address of the commercial vehicle is fixed. The respective address of a towed vehicle corresponds to its position within the road train and has to be newly assigned each
44、 time communication starts, or a towed vehicle has been connected. For towing vehicle/towed vehicle communication, the addresses shown in Table 3 shall be used as SAs and DAs. To avoid any transmission conflict during the dynamic address assignment phase (power-up), the PDU 2 type message shall have
45、 even PS (GE) in the predecessor transmission direction and odd PS (GE) in the successor transmission direction. If the same message has to be sent in both transmission directions, two PSs (GE) are necessary. The dynamic address assignment shall be handled by the respective towing vehicle/towed vehi
46、cle node and concerns the determination of the individual position within the road train. The global destination address shall only be used by the commercial vehicle to broadcast information to all towed vehicles simultaneously. The dynamic address assignment is based on the transmission of the stan
47、dard initialization message (see 6.5) by the respective predecessor within the road train. Within a road train, the address assignment procedure shall be initiated by the commercial vehicle, using its standard address for the standard initialization message (see Table 3). A powered-up towed vehicle
48、node shall use the towed vehicle #1 address as the default address for transmitting available information, until the standard initialization has been received and a valid address can be assigned. -,-,- ISO 11992-2:2003(E) 6 ISO 2003 All rights reserved Table 3 Commercial vehicle/towed vehicle addresses Nam