Systems and methods for landing identification

Patent metadata

Field	Value
Publication number	US-9688388-B2
Application number	US-201113312073-A
Country	US
Kind code	B2
Filing date	Dec 6, 2011
Priority date	Dec 6, 2011
Publication date	Jun 27, 2017
Grant date	Jun 27, 2017

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 system comprising:
a monostable multivibrator in electrical communication with a signal conditioner, the signal conditioner configured to receive wheel speed data at a frequency, the signal conditioner configured to send pulse information to the monostable multivibrator, the monostable multivibrator further configured to set a time period in response to the pulse information;
a wheel angular displacement circuit in electrical communication with the monostable multivibrator, the wheel angular displacement circuit comprises a metal-oxide-semiconductor field-effect transistor (MOFSET) and a resistor-capacitor network, the wheel angular displacement circuit configured to receive the pulse information, wherein a voltage output from the wheel angular displacement circuit decreases in response to an increase in a frequency of the pulse information; and
a comparator in electrical communication with the wheel angular displacement circuit and a reference voltage source, wherein the comparator is configured to compare the voltage output from the wheel angular displacement circuit and the reference voltage source,
wherein a likelihood of a landing event is determined based upon the comparison.

2. The system of claim 1 , wherein the wheel angular displacement circuit further comprises a voltage follower.

3. The system of claim 2 , wherein the MOFSET is in electrical communication with the monostable multivibrator.

4. The system of claim 3 , wherein the comparator outputs a greater of the reference voltage source and an output voltage of the wheel angular displacement circuit.

5. The system of claim 2 , wherein, in response to the frequency increasing, an output voltage of the voltage follower decreases.

6. A method comprising:
receiving pulse information, at a monostable multivibrator, over a first time period, wherein the pulse information is indicative of an angular displacement traveled by a first wheel;
setting a time period, by the monostable multivibrator, in response to the pulse information;
receiving the pulse information by a wheel angular displacement circuit, the wheel angular displacement circuit coupled to a comparator;
receiving a reference voltage at the comparator;
decreasing a voltage output of the wheel angular displacement circuit in response to an increase in a frequency of the pulse information;
comparing the voltage output of the wheel angular displacement circuit to the reference voltage at the comparator; and
determining a likelihood of a landing event based upon the comparison.

7. The method of claim 6 , wherein the pulse information is at least one of digital and analog.

8. The method of claim 7 , wherein the pulse information comprises a voltage.

9. The method of claim 6 , wherein the pulse information comprises a voltage.

Assignees

• Cahill Eric D
• Shaw Michael
• Goodrich Corp

Inventors

• Cahill Eric D
• Shaw Michael

Classifications

• B64C25/46 Primary

  Brake regulators for preventing skidding or aircraft somersaulting · CPC title

• B64C25/00 Primary

  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