Caterpillar Inc.

Frederick Beach

Bradley Bailey

Matthew L Hendrickson

William James Tate

Cameron T Lane

Michael D Staub

Douglas J Lockhart

Jun Dou

A controller () in an electric drive system is used to determine the operating condition of array of rotating diodes (B) within a generator (). During operation, the controller () receives a set of generator inputs, a set of machine parameters, and a set of diagnostic values. Next, the controller () determines a set of expected operating values corresponding to the set of diagnostic values. The controller () then compares the obtained diagnostic values to one or more corresponding expected operating values. If the difference is greater than a threshold, the controller () provides a fault indication that one or more of the array of rotating diodes (B) has malfunctioned.

Method and apparatus for determining the operating condition of generator rotating diodes

A system for detecting a short circuit in a direct current (DC) link (), wherein the DC link () is coupled with a rectifier () which includes a set of rectifier diode pairs (). During operation, a controller () receives a set of outputs of a power generator, a set of machine parameters, and a set of diagnostic values. Next, the controller () determines a set of expected operating values corresponding to the set of diagnostic values. The controller () then compares diagnostic values to corresponding expected operating values. If the difference between the diagnostic values and the expected operating values exceeds a threshold, the controller () provides a flag to indicate that a short circuit condition exists.

Method and apparatus for detecting a short circuit in a DC link

The control system may have an electric motor and a traction device connected to an output of the motor. The control system may also have a decelerator and a controller. The controller may be in communication with the motor and the decelerator. The controller may be configured to determine a creep torque and apply the creep torque to the traction device when the decelerator is actuated.

Creep control for motor system

A controller () in an electric drive system is used to develop power generation failure diagnostics. During operation, the controller () receives a set of generator inputs, a set of machine parameters, and a set of diagnostic values. Next, the controller () determines a set of expected operating values corresponding to the set of diagnostic values. The controller () then compares the obtained diagnostic values to one or more corresponding expected operating values. If the difference is greater than a threshold, the controller () provides an appropriate fault indication.

Method and apparatus for power generation failure diagnostics

A machine includes an electric drive propulsion system including an internal combustion engine, an alternator, a motor controller, and at least one electric motor. The machine further includes an electronic controller in communication with the electric drive propulsion system. The electronic controller is configured to determine, in chassis, and store a lugging horsepower of the engine at a plurality of different engine speeds. The machine further includes a memory for storing the lugging horsepower for each of the plurality of different engine speeds corresponding to lug curve data. The electronic controller is further configured to affect a control decision based on the lug curve data.

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East Peoria, IL, United States of America

Frederick Beach