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FLIGHT CONTROL STICK

IP.com Disclosure Number: IPCOM000235930D
Publication Date: 2014-Mar-31
Document File: 3 page(s) / 83K

Publishing Venue

The IP.com Prior Art Database

Abstract

Flight control stick which comprises a grip [1] made of a non-conductive material, a conductive layer [2] over the non-conductive material and an isolating paint layer [3] over the conductive layer [2] so that the hand of the pilot creates a capacitor when it is close to the grip acting the hand as an electrode.

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FLIGHT CONTROL STICK

     Flight control stick which comprises a grip [1] made of a non-conductive material, a conductive layer [2] over the non-conductive material and an isolating paint layer [3] over the conductive layer [2] so that the hand of the pilot creates a capacitor when it is close to the grip acting the hand as an electrode.


2.- DISCLOSURE

Prior art

  There are different known systems for detection of an operator holding the grip of the stick:

- Force divergence: When a force, bigger than a certain threshold is applied to the grip of the stick and this force is divergent to the force applied by the force- feedback control, an operator intervention is assumed.

- Microswitches in the grip: Some grips have embedded into them microswitching devices that sence when a threshold pressure is applied onto them. When these microswitches change their state, it is assumed that an operator is grabbing the grip

- Electrodes in the grip: Some grips have electrodes on their surface. These electrodes measure the resistance between them. When the resistance between the electrode is the same as the equivalent skin resistance, it is assumed that an operator is grabbing the grip.

- Optoelectronic devices: Some grips have opto electronic devices embedded into them that measure the light (usually emitted by them) in order to detect the proximity of any object. When these devices detect a near object, it is assumed that an operator is grabbing the grip.

  EP1537665B1 discloses a detection function based in a capacitance formed by an electrode provided at the control stick and an operator hand when it is close to the electrode to acts as a grounded electrode of the capacitance, so that presence of the operator hand on the stick, is detected by a capacitor formed between the operator hand and the stick electrode, additionally a frequency variation is converted into an amplitude variation, so that when an operator hand gets closer to the stick and reaches a predefined threshold value, the output of the Schmitt trigger is activated (activating a switch in the words of claim 1), and when the operator hand is moved away from the


1.- ABSTRACT


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stick and reaches another predefined threshold value, the output of the Schmitt trigger is desactivated. In other words, the activati...