Electric jack ground contact detection method and device

Electricity: motive power systems – Constant motor current – load and/or torque control

Reexamination Certificate

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Details

C318S433000, C318S436000, C254S418000, C254S424000

Reexamination Certificate

active

11243253

ABSTRACT:
An electric jack ground contact detection method and device for detecting ground contact of an electric motor-driven jack as the jack is being extended to adjust the attitude of a mobile platform. The device includes a controller that monitors the electrical power draw of an electric motor-driven jack while the jack is being extended for use in adjusting the attitude of a mobile platform. The controller recognizes jack ground contact when the monitored power draw value exceeds a ground contact power draw value consistent with jack ground contact. The controller calculates the ground contact power draw value as equaling the sum of a dynamically-adjusted threshold power draw value associated with jack extension before ground contact and a power draw increase value equaling an amount of additional power that the jack is known to draw as a result of jack ground contact.

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