Caterpillar Inc.

Darrel W Berglund

John W Crayton

Timothy A Boston

David C Freeman

Zachary A Kauk

Daniel K Dunn, Iii

A system for monitoring switch activity using a data network includes a double pole double throw switch biased and connected to provide redundant signals from both outputs of the same switch and to convey both signals over a data network, such as a controller area network (CAN). The switch outputs may be biased to opposite polarities to improve distance between the signals.

Parity on data link switches

A machine includes a master electronic control module and at least one secondary electronic control module. A method of operating the machine includes steps of determining whether preconditions are satisfied for changing the master electronic control module from an operating state to a low power state, and determining whether preconditions are satisfied for changing the secondary electronic control module from an operating state to a power off state by opening a power supply circuit. The method also includes steps of changing the secondary electronic control module from the operating state to the power off state, and changing the master electronic control module from the operating state to the low power state.

Method for reducing quiescent power draw and machine using same

A power and data delivery system for a machine. The system includes a conductor located throughout at least a portion of the machine for delivering power, a plurality of nodes, each connected to the conductor at a respective location, and a plurality of devices, each connected to a corresponding node. At least one node controls the delivery of power and data by way of a message containing a unique identifier for that one node.

System and method for power and data delivery on a machine

An apparatus is provided for sensing an angular position of a shaft or other rotatable body. The apparatus preferably includes a first and second housing portion. A circuit connected to a circuit board is housed in the housing and includes a plurality of proximity sensors. A rotatable member is rotatably attached to the circuit board and includes a position indicator. The circuit produces a signal as a function of the position of the rotatable member.

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Peoria, IL, United States of America

Darrel W Berglund