# US 2014/0191087 A1 · Aircraft and aircraft control method

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- Number: US 2014/0191087 A1
- Document ID: US20140191087A1
- Status: Published application
- Kind: A1
- Application number: 14/241,232
- Filed: 2012-10-12
- Published: 2014-07-10
- Earliest claimed: 2011-10-18
- Assignees: Mitsubishi Heavy Industries, Ltd.
- Applicants: Mitsubishi Heavy Industries, Ltd.
- Inventors: Yosuke Higuchi; Takeshi Matsuda
- Web page: https://patentgrep.com/patent/US20140191087A1

## CPC

- B64C 13/16: actuated automatically, e.g. responsive to gust detectors
- B64C 13/0421: {control sticks for primary flight controls}
- B64C 27/57: automatic or condition responsive, e.g. responsive to rotor speed, torque or thrust
- B64C: AEROPLANES; HELICOPTERS

## Abstract

An aircraft is provided with a mechanical linkage that mechanically transmits an amount of manipulation of a control stick to a rudder controlling mechanism, an amount-of-manipulation sensor that detects the amount of manipulation, and an FBW control-law computing unit that calculates an FBW control-law command indicating an amount of control for a craft in accordance with the detected amount of manipulation. Also, with the aircraft, a high-pass filter outputs, among the control-stick manipulation amounts detected by the amount-of-manipulation sensor, an amount of change in the control-stick manipulation amounts; by subtracting the amount of change that has passed through the high-pass filter by means of the subtracting portion, the FBW control-law command serves as an SAS command; and the rudder controlling mechanism is driven by adding an amount of movement of an SAS actuator in accordance with the SAS command to the control-stick manipulation amount transmitted by the mechanical linkage.

## Claims

### Claim at position 1

1-3. (canceled)

### Claim 4

An aircraft comprising:
a control stick for a pilot to maneuver a craft;
an amount-of-rudder-control transmitting part that mechanically transmits an amount of manipulation of the control stick to a rudder controlling part;
a detecting part that detects the amount of manipulation;
an amount-of-control calculating part that calculates an amount of control for the craft in accordance with the amount of manipulation detected by the detecting part;
an amount-of-change outputting part that outputs, among the amounts of manipulation detected by the detecting part, an amount of change in the amounts of manipulation;
a subtracting part that subtracts the amount of change output from the amount-of-change outputting part from the amount of control calculated by the amount-of-control calculating part; and
an actuator that adds an amount of manipulation in accordance with a subtracted value output from the subtracting part to the amount of manipulation transmitted by the amount-of-rudder-control transmitting part.

### Claim 5 (depends on 4)

An aircraft according to claim 4, wherein the amount-of-change outputting part attenuates, over time, the amount of manipulation to be output when the amount of manipulation has stopped changing.

### Claim 6

An aircraft control method which is a method of controlling an aircraft provided with a control stick for a pilot to maneuver a craft, an amount-of-rudder-control transmitting part that mechanically transmits an amount of manipulation of the control stick to a rudder controlling part, a detecting part that detects the amount of manipulation, an amount-of-control calculating part that calculates an amount of control for the craft in accordance with the amount of manipulation detected by the detecting part, the aircraft control method comprising:
a first step of outputting, among the amounts of manipulation detected by the detecting part, an amount of change in the amounts of manipulation;
a second step of subtracting the amount of change from the amount of control calculated by the amount-of-control calculating part; and
a third step of driving the rudder controlling part by adding an amount of movement of the actuator in accordance with a subtracted value obtained by the subtraction performed in the second step to the amount of manipulation transmitted by the amount-of-rudder-control transmitting part.