Systems and methods for landing identification

• US 9,976,875 B2
• Filed: 05/23/2017
• Issued: 05/22/2018
• Est. Priority Date: 12/06/2011
• Status: Active Grant

• Current Assignee: Goodrich Corporation (Raytheon Technologies Corporation d/b/a RTX)
• Original Assignee: Goodrich Corporation (Raytheon Technologies Corporation d/b/a RTX)
• Inventors: Cahill, Eric D, Shaw, Michael
• Primary Examiner(s): Rivera Vargas, Manuel A
• Application Number:
  US15/603,116
• Publication Number:
  US 20170261341A1
• Time in Patent Office: 364 Days
• CPC Class Codes: B64C 25/00 Alighting gear air-cushion alighting gear B60V3/08
• CPC Class Codes: B64C 25/46 Brake regulators for preventing skidding or aircraft somersaulting
• CPC Class Codes: G01D 5/14 influencing the magnitude of a current or voltage
• CPC Class Codes: G01P 3/44 for measuring angular speed G01P3/56 takes precedence
• CPC Class Codes: H03K 3/0232 Monostable circuits

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.

Claims

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.