Society of Automotive Engineers standard SAE J1939 is the vehicle bus recommended practice used for communication and diagnostics among vehicle components. Originating in the car and heavy-duty truck industry in the United States, it is now widely used in other parts of the world.
SAE J1939 is used in the commercial vehicle area for connection and communication throughout the vehicle, with the physical layer defined in ISO 11898. A different physical layer is used between the tractor and trailer, specified in ISO 11992.
Originally, Controller Area Network (CAN) was not mentioned in J1939, which covered cars and tractor-trailer rigs, and with some dual and triple use 8-bit addresses assigned by the SAE J1939 board. CAN was not originally free, but its instruction set did fit in the custom instruction format of J1939. This was true as of 2000. Since then, CAN has been included, the chipset for J1939 has been clocked faster[clarification needed], and 16-bit addresses (PGN) have replaced 8-bit addresses.
J1939, ISO 11783 and NMEA 2000 all share the same high level protocol. SAE J1939 can be considered the replacement for the older SAE J1708 and SAE J1587 specifications.[citation needed]
Definition
SAE J1939 defines five layers in the seven-layer OSI network model, and this includes the Controller Area Network (CAN) ISO 11898 specification (using only the 29-bit/"extended" identifier) for the physical and data-link layers. Under J1939/11 and J1939/15, the data rate is specified as 250 kbit/s, with J1939/14 specifying 500 kbit/s. The session and presentation layers are not part of the specification. The later use of CAN FD is currently discussed.[when?]
All J1939 packets, except for the request packet, contain eight bytes of data and a standard header which contains an index called Parameter Group Number (PGN), which is embedded in the message's 29-bit identifier. A PGN identifies a message's function and associated data. J1939 attempts to define standard PGNs to encompass a wide range of automotive, agricultural, marine and off-road vehicle purposes. A range of PGNs (00FF0016 through 00FFFF16, inclusive) is reserved for proprietary use. PGNs define the data which is made up of a variable number of Suspect Parameter Number (SPN) elements defined for unique data. For example, there exists a predefined SPN for engine RPM.
Applications
SAE J1939 has been adopted widely by diesel engine manufacturers. One driving force behind this is the increasing adoption of the engine Electronic Control Unit (ECU), which provides one method of controlling exhaust gas emissions within US and European standards. The telematics data is used (via Fleet Telematics Systems) by Fleet Management Systems to let fleet operators keep track of vehicle and driver performance, such as fuel consumption, safety events, and repair time.[1]
Because of the demanding standards, engine development is expensive, and truck-based engines are reused in many fields. Consequently, SAE J1939 can now be found in a range of diesel-powered applications: vehicles (on- and off-road and rail), marine propulsion, power generation and industrial pumping.
^"Navistar Taps Telematics to Gain Intelligence on Truck Rivals". Trucks.com. 17 December 2019. from the original on 2020-01-13.
External links
SAE J1939 Top Level Document
J1939 Introduction (Kvaser)
Introduction to J1939 (Vector Informatik)
A Comprehensible Guide to J1939 (Book)
April 14, 2023
j1939, this, article, needs, additional, citations, verification, please, help, improve, this, article, adding, citations, reliable, sources, unsourced, material, challenged, removed, find, sources, news, newspapers, books, scholar, jstor, september, 2015, lea. This article needs additional citations for verification Please help improve this article by adding citations to reliable sources Unsourced material may be challenged and removed Find sources SAE J1939 news newspapers books scholar JSTOR September 2015 Learn how and when to remove this template message Society of Automotive Engineers standard SAE J1939 is the vehicle bus recommended practice used for communication and diagnostics among vehicle components Originating in the car and heavy duty truck industry in the United States it is now widely used in other parts of the world SAE J1939AbbreviationSAE J1939StatusPublishedLatest version2013 08 14OrganizationSAE InternationalCommitteeTruck Bus Control And Communications Network CommitteeRelated standardsISO 11898 ISO 11992 ISO 11783 NMEA 2000SAE J1939 is used in the commercial vehicle area for connection and communication throughout the vehicle with the physical layer defined in ISO 11898 A different physical layer is used between the tractor and trailer specified in ISO 11992 Contents 1 History 2 Definition 3 Applications 4 See also 5 References 6 External linksHistory EditOriginally Controller Area Network CAN was not mentioned in J1939 which covered cars and tractor trailer rigs and with some dual and triple use 8 bit addresses assigned by the SAE J1939 board CAN was not originally free but its instruction set did fit in the custom instruction format of J1939 This was true as of 2000 Since then CAN has been included the chipset for J1939 has been clocked faster clarification needed and 16 bit addresses PGN have replaced 8 bit addresses J1939 ISO 11783 and NMEA 2000 all share the same high level protocol SAE J1939 can be considered the replacement for the older SAE J1708 and SAE J1587 specifications citation needed Definition EditSAE J1939 defines five layers in the seven layer OSI network model and this includes the Controller Area Network CAN ISO 11898 specification using only the 29 bit extended identifier for the physical and data link layers Under J1939 11 and J1939 15 the data rate is specified as 250 kbit s with J1939 14 specifying 500 kbit s The session and presentation layers are not part of the specification The later use of CAN FD is currently discussed when All J1939 packets except for the request packet contain eight bytes of data and a standard header which contains an index called Parameter Group Number PGN which is embedded in the message s 29 bit identifier A PGN identifies a message s function and associated data J1939 attempts to define standard PGNs to encompass a wide range of automotive agricultural marine and off road vehicle purposes A range of PGNs 00FF0016 through 00FFFF16 inclusive is reserved for proprietary use PGNs define the data which is made up of a variable number of Suspect Parameter Number SPN elements defined for unique data For example there exists a predefined SPN for engine RPM Applications EditSAE J1939 has been adopted widely by diesel engine manufacturers One driving force behind this is the increasing adoption of the engine Electronic Control Unit ECU which provides one method of controlling exhaust gas emissions within US and European standards The telematics data is used via Fleet Telematics Systems by Fleet Management Systems to let fleet operators keep track of vehicle and driver performance such as fuel consumption safety events and repair time 1 Because of the demanding standards engine development is expensive and truck based engines are reused in many fields Consequently SAE J1939 can now be found in a range of diesel powered applications vehicles on and off road and rail marine propulsion power generation and industrial pumping See also EditFleet Management System CANopen CAN FD Flexible Data Rate Open SAE J1939References Edit Navistar Taps Telematics to Gain Intelligence on Truck Rivals Trucks com 17 December 2019 Archived from the original on 2020 01 13 External links EditSAE J1939 Standards Collection SAE J1939 Top Level Document J1939 Introduction Kvaser Introduction to J1939 Vector Informatik A Comprehensible Guide to J1939 Book Retrieved from https en wikipedia org w index php title SAE J1939 amp oldid 1134257748, wikipedia, wiki, book, books, library,
