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SAE J1939 / ISO 11783 Tractor ECU

SAE J1939 / ISO 11783 Tractor ECU. Lecture 7 Tractor ECU ISO 11783 Part 9 BAE 5030 - 353 Spring 2009 Instructor: Marvin Stone Biosystems and Agricultural Engineering Oklahoma State University. Network Context of the TECU. ISO 11783 Tractor Electronic Control Unit (TECU). TECU Functions

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SAE J1939 / ISO 11783 Tractor ECU

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  1. SAE J1939 / ISO 11783 Tractor ECU Lecture 7 Tractor ECU ISO 11783 Part 9 BAE 5030 - 353 Spring 2009 Instructor: Marvin Stone Biosystems and Agricultural Engineering Oklahoma State University BAE 5030-353

  2. Network Context of the TECU BAE 5030-353

  3. ISO 11783 Tractor Electronic Control Unit (TECU) • TECU Functions • Transfers data and command messages to/ from the tractor to the implement bus as appropriate for the Tractor ECU’s classification • Represents the tractor on the implement bus, including access to the Virtual Terminal • Sends requested tractor information on the implement bus • Parses messages and commands from the implement bus appropriate for the tractor design • Identifies its classification and message set to all ECUs on the implement bus on request using a tractor facilities message (see ISO 11783-7).

  4. ISO 11783 TECU Tractor Classification • Specifies Tractor classes of ISOBUS capability • A Tractor ECU classification informs the operator of a tractor’s compatibility with implements • Each classification identifies a minimum set of messages that a tractor shall provide to connected implements on the implement bus • The set of messages a classified Tractor ECU has to provide depends on the tractor’s features • The Tractor manufacturer may provide additional messages without providing the complete set of messages of the next higher class of Tractor ECU

  5. Class 1, tractor basic information • Shall provide following internal tractor measurements • Power management: • key switch state; • maximum time of tractor power; • maintain power request. • Speed information: • wheel-based implement speed; • ground-based implement speed; • engine speed: message transmission rate shall be 100 ms. • Hitch Information: • rear hitch position; • rear implement in-work indication. • PTO (power take-off) information: • rear PTO output shaft speed; • rear PTO output shaft engagement.

  6. Class 1, tractor basic information - Continued • Lighting: • left-turn signal lights; • right-turn signal lights; • marker light; • left stop light; • right stop light; • implement rear work light. • Language-specific parameter storage in tractor ECU, VT or both.

  7. Class 2, enhanced tractor information • Shall provide all of the class 1 messages and • Time & date, • Wheel & ground based distance & direction, • Rear hitch draft and lower link forces, • Complete set of lighting commands • Auxiliary valve (EHRs) estimated and measured status messages

  8. Class 3, command from the connected implement • Shall provide all of the class 1 & 2 messages and • Rear hitch commands, • Rear PTO rpm set-point & engagement commands, • Auxiliary valve (EHRs) command messages, • An implement or the task controller can request the adjustment of the power source as well as the hitch position • A Tractor - Implement combination can perform the same as a self-propelled machine

  9. TECU Additional Features • Interface options to TECU classifications 1 to 3 are: • Option (F) -- Front hitch & Front PTO • Option (N) -- Navigation / location • TECU shall also provide the following capabilities: • Implement electrical power control • Implement lighting control • Safe mode operation

  10. ISO 11783 TECU Electrical Connections

  11. ISO 11783 TECU “Fall-Back” for Lighting

  12. Safe-Mode Operation • Upon loss of power or communication with the tractor, the implement shall assume a condition of fail-safe operation. The interruption, re-establishment after interruption or fluctuation in any manner whatsoever of the power supply to the implement shall not result in a dangerous situation. Neither shall a fault in the control logic, nor failure or damage to the control circuit, be allowed to lead to danger. BAE 5030-353

  13. Safe Mode Requirements • The implement shall not start unexpectedly. • The implement shall not be prevented from stopping if the command has already been given. • No part of the implement, or a piece held by the implement, shall fall or be ejected. • Automatic or manual stopping of any moving part shall be unimpeded. • The protection devices shall remain fully effective. • Remote-controlled implements shall be designed and constructed to stop automatically in the event of the driver losing control. • The operator shall have the ability to override implement-controlled systems. BAE 5030-353

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