Systems and methods for landing identification

Patent metadata

Field	Value
Publication number	US-9976875-B2
Application number	US-201715603116-A
Country	US
Kind code	B2
Filing date	May 23, 2017
Priority date	Dec 6, 2011
Publication date	May 22, 2018
Grant date	May 22, 2018

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 monostable 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 system comprising:
a monostable multivibrator in electrical communication with a metal-oxide-semiconductor field-effect transistor (MOSFET) and a wheel angular displacement circuit;
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,
wherein the monostable multivibrator is configured to set a time period in response to receiving a conditioned angular displacement signal,
wherein the wheel angular displacement circuit changes state in response to angular displacement above a displacement threshold over the first time period,
wherein the comparator compares the reference voltage to a voltage output of the resistor-capacitor network, and
wherein a voting scheme determines a likelihood of a landing event based upon the comparison.

2. The system of claim 1 , further comprising a signal conditioner that conditions an input AC signal, the signal conditioner in electrical communication with the monostable multivibrator.

3. The system of claim 2 , wherein the resistor-capacitor network comprises two capacitors and two resistors.

4. The system of claim 3 , further comprising a voltage follower in electrical communication with the comparator.

5. The system of claim 4 , wherein the resistor-capacitor network further comprises a node having an average voltage.

6. The system of claim 2 , further comprising an external hysteresis circuit in electrical communication with the resistor-capacitor network.

7. The system of claim 6 , wherein the external hysteresis circuit comprises a first resistor coupled to a first terminal of the comparator and a second resistor wired in series with the first resistor.

Assignees

• Goodrich Corp

Inventors

• Cahill Eric D
• Shaw Michael

Classifications

• B64C25/46 Primary

  Brake regulators for preventing skidding or aircraft somersaulting · CPC title

• B64C25/00

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

• G01P3/44

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

• G01D5/14 Primary

  influencing the magnitude of a current or voltage · CPC title

• H03K3/0232

  Monostable circuits · CPC title