Systems and methods for landing identification

Patent metadata

Field	Value
Publication number	US-10648835-B2
Application number	US-201815957738-A
Country	US
Kind code	B2
Filing date	Apr 19, 2018
Priority date	Dec 6, 2011
Publication date	May 12, 2020
Grant date	May 12, 2020

Abstract

Systems and methods disclosed herein may be useful for use in landing identification. In this regard, a method is provided comprising receiving pulse information over a first time period, wherein the pulse information is indicative of an angular distance traveled by a first wheel, comparing the pulse information to a threshold value, and determining a likelihood of a landing event based upon the comparison. In various embodiments, a system is provided comprising a monstable multivibrator in electrical communication with a metal-oxide-semiconductor field-effect transistor (MOSFET), a resistor-capacitor network in electrical communication with the MOSFET, and a comparator that receives a voltage from the resistor-capacitor network and a reference voltage.

First claim

The invention claimed is:

1. A method for landing identification comprising:
triggering a monstable multivibrator in response to a conditioned wheel angular displacement signal;
sinking current, using a metal-oxide-semiconductor field-effect transistor (MOSFET), in response to the triggering;
creating an average voltage at a node from pulsed voltage at a drain of the MOSFET; comparing, using a comparator, the average voltage to a reference voltage; and
determining a likelihood of a landing event based upon the comparison.

2. The method of claim 1 , further comprising conditioning a wheel angular displacement to obtain the conditioned wheel angular displacement signal.

3. The method of claim 1 , further comprising buffering the comparator using a voltage follower.

4. The method of claim 1 , wherein the creating the average voltage is performed by a resistor-capacitor network.

5. The method of claim 1 , further comprising adding hysteresis to the comparator using a resistor.

6. The method of claim 1 , further comprising increasing a duty cycle of the MOSFET.

7. The method of claim 6 , further comprising decreasing, in response to the increase in the duty cycle of the MOSFET, the average voltage.

Assignees

• Goodrich Corp

Inventors

• Cahill Eric D
• Shaw Michael

Classifications

• B64C25/00

  Alighting gear (air-cushion alighting gear B60V3/08) · CPC title

• H03K3/0232

  Monostable circuits · CPC title

• B64C25/46 Primary

  Brake regulators for preventing skidding or aircraft somersaulting · CPC title

• G01D5/14 Primary

  influencing the magnitude of a current or voltage · CPC title

• G01P3/44

  for measuring angular speed (G01P3/56 takes precedence) · CPC title