Caterpillar Inc.

Thuong Le

Jackson Wai

Mark E Hartman

James David Siegle

Jesse R Gerdes

Timothy Goldammer

Adam Braun

Jason Lee Miller

Bruce Henry Hein

Zhen Li

Mingsheng Xiao

Liang Li

The invention relates to a control method for a quick change device of a work tool, comprising the steps of: receiving a command to disengage a work tool clamping device; determining whether the work tool clamping device is in an engaged state; detecting functionality of a disengagement alarm if the work tool is in the engaged state; switching to an emergency state upon the detection of failure of the disengagement alarm. The present invention further relates to a corresponding control apparatus and work machine.

Control method and apparatus for quick change device of work tools

A control system for a generator of an electric drive is provided. The control system may include a converter circuit configured to communicate with one or more phases of a stator of the generator, and a controller in communication with the converter circuit and an engine associated with the electric drive. The controller may be configured to determine an operational state of the electric drive based on at least engine speed, and engage one of a map-lookup control scheme and a fixed-theta off control scheme for operating the generator based on the operational state of the electric drive.

Switched reluctance generator integrated controls

A method of controlling a generator () of an electric drive () associated with an engine () is provided. The method may determine an operational state of the electric drive () based on a speed of the engine (), and selectively engage one of a map-lookup control scheme () and a fixed-theta off control scheme () for operating the generator () based on the operational state of the electric drive ().

A method of priming a common bus of a machine having an engine, a generator and an auxiliary power source is provided. The method may determine an operational state of the auxiliary power source, operate the engine at a predetermined idle speed if the auxiliary power source is determined to be inoperative, and enable the generator to regulate the common bus in response to the predetermined idle speed of the engine.

Switched reluctance generator priming strategy

A method of actively discharging a common bus () of a machine () having an engine (), a generator (), a traction motor () and one or more auxiliary devices () is provided. The method may monitor a speed of the engine () with respect to a first threshold, monitor a voltage of the common bus () with respect to a second threshold, and enable one or more of the generator (), the motor () and the auxiliary devices () if the engine speed falls below the first threshold and the voltage exceeds the second threshold so as to discharge voltage from the common bus ().

Active high voltage bus bleed down

A method for testing a power converter having at least one power transistor is disclosed. The method may include receiving a power transistor test request, and resetting a fault flag. The method may also include applying a gate driver signal to each power transistor, receiving a feedback signal from each power transistor, and determining a difference between the gate driver signal and the feedback signal associated with a respective power transistor. The method may further include identifying a fault if the difference exceeds a threshold profile, and setting a fault flag when a fault is identified.

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Edwards, IL, United States of America

Thuong Le