Caterpillar Inc.

Dean J Schlickbernd

Mitchell J McGowan

Mark R Hawkins

Clifford E Miller

John Andrew Yeoman

Steven J Zmuda

Bobby D Griffith

The present invention provides a method for automatically shutting down an engine on a machine in during an operators absence in order to prevent potential damage to the machine. A determination is made regarding if the machine is running, and an if an operator is not present. In the preferred embodiment a plurality of predetermined shutdown values, which correspond with at least one of a plurality of critical parameters, are stored in the controller. The machine will shutdown if the critical parameters are determined to be beyond the shutdown values. Additionally, a cool down feature, if enabled, will cause the machine to cool down prior to the machine being shutdown.

Method for automatically shutting down a machine during an operator's absence

A method for controllably moving a machinery platform of a work machine having an electro-hydraulic system is disclosed. The work machine includes at least one swing motor configured to move the machinery platform . The changing speed of the swing motor is determined. A solenoid actuated valve is controlled in response to the determination. The solenoid actuated valve is configured to responsively produce a relief valve pilot signal . The two-way relief valve is controllably shifted in response to the inputted relief valve pilot signal . At least one of a high pressure by-pass valve and a low pressure by-pass valve is selected in response to the two-way relief valve shifting.

Method and an apparatus for an electro-hydraulic system on a work machine

A control system for lubricating a work machine is provided. The control system includes a lubricant distribution system, a charging system adapted to drive the lubricant distribution system, a sensor for determining the operating state of the charging system, and a device for calculating a time interval being dependent upon a previous lubricating event. The control also includes a device for producing a lubrication signal in response to the time interval reaching a predetermined interval constant.

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Joliet, IL, United States of America

Dean J Schlickbernd