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Details
Inventors: Nielsen, Brad;
Assignee: Case Corporation (Racine, WI)
Primary Examiner: Black; Thomas G.
Assistant Examiner: Mancho; Ronnie
Attorney, Agent or Firm: Stader; John William, Henkel; Rebecca L.

A communications system for a work vehicle is shown for managing communications between control units which control various functions of the vehicle. The system includes a data bus supported by the vehicle for communicating messages between control units on the bus. Each control unit has a processor for controlling bi-directional communications with the other control units, including the transmission of first messages onto the data bus and reception of second messages from the bus. The processor of each control unit schedules the transmission of only a predefined number of the first messages on the bus during a predefined time period. This number of first messages is selected to insure that each control unit is able to transmit its scheduled messages within the time period. The processor of each control unit efficiently sorts the second messages in reference to a plurality of lookup tables to distinguish between undesired messages and a set of desired messages, and to save each of the desired messages in a memory location defined to store the respective message. When the same message is received from multiple control units, the same messages are stored in a shared memory location, where the stored message can be overwritten by a more recently received same message, or in unique memory locations so that the particular same messages received from different control units can be distinguished.

DETAILED DESCRIPTION The present invention relates to a communications system for a work vehicle.
The communications system includes a data bus supported by the work vehicle for communicating messages along with multiple control units coupled to the data bus.
Each control unit controls a function of the work vehicle and includes a processor for controlling communications with at least one other control unit on the data bus.
The communications include transmitting first messages onto the data bus and receiving second messages from the data bus.
The processor of each control unit schedules the transmission of only a predefined number of the first messages on the bus during a predefined time period.
The predefined number is selected so that each control unit can transmit its scheduled messages within the predefined time period.
The present invention further relates to a communications system for a work vehicle.
The communications system includes a data bus supported by the work vehicle for communicating messages and multiple control units coupled to the bus.
Each control unit controls a function of the work vehicle, and includes a processor for controlling communications with at least one other control unit on the data bus.
The communications include transmission of first messages onto the bus and reception of second messages from the bus.
The second messages include undesired messages and a set of desired messages.
The processor of each control unit also sorts the second messages in reference to a plurality of lookup tables to distinguish between the undesired messages and the set of desired messages, and saves each of the desired messages in a memory location defined to store the respective message.
The present invention further relates to a communications system for a work vehicle.
The communications system includes a data bus supported by the work vehicle for communicating messages and multiple control units coupled to the bus.
Each control unit controls a function of the work vehicle, and includes a processor for controlling communications with at least one other control unit on the data bus


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