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Assisted takeoff

a technology of assisted takeoff and launching gear, which is applied in the direction of instruments, electric controllers, launching/towing gear, etc., to achieve the effect of increasing the overall propulsion of the movable obj

Active Publication Date: 2015-10-01
SZ DJI TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The patent describes a method to increase the output of an actuator to increase the overall propulsion of a movable object. The method includes receiving a command to start the actuator and placing it in an idle mode prior to receiving a command to increase the altitude of the object. The output to the actuator is then increased until it reaches a predetermined value, at which point it is reduced until the actuator is in an idle mode to prevent exceeding the predetermined value. This method allows for controlled and efficient increase in altitude of the movable object.

Problems solved by technology

Existing proportional-integral-derivative (PID) controllers, due to memory effects of integration, will result in a ground force, which may cause the integration expression to be wrong and cause instability.

Method used

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Embodiment Construction

[0041]The systems, devices, and methods of the present invention provide assisted takeoff for an aerial vehicle from a surface, which enables improved control for a user. The aerial vehicle may be an unmanned aerial vehicle (UAV), or any other type of movable object. Oftentimes, a feedback control is used during flight of an aerial vehicle. During normal flight operations, a proportional-integral-derivative (PID) flight control system is often used. However, during takeoff, memory effects of integration combined with ground forces may cause the meaning of the integration expression to go wrong. This can cause instability during takeoff and may require complex maneuvers that many novice users may not be familiar or comfortable with. This can lead to crashing of the UAV during takeoff.

[0042]An assisted takeoff system, method, and device may be provided which may reduce this instability during takeoff and permit novice users to easily control the aerial vehicle during takeoff. While th...

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PUM

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Abstract

Systems, methods, and devices are provided for assisted takeoff of an aerial vehicle. The aerial vehicle may takeoff using a first control scheme and switch to a second control scheme for normal flight when a takeoff threshold is met. The first control scheme optionally does not use integral control while the second control scheme may use integral control. The aerial vehicle may determine that a takeoff threshold is met, based on an output to a motor of the aerial vehicle and / or an acceleration of the aerial vehicle.

Description

CROSS-REFERENCE[0001]This application is a continuation application of International Application No. PCT / CN2014 / 074232, filed on Mar. 27, 2014, the content of which is hereby incorporated by reference in its entirety.BACKGROUND OF THE INVENTION[0002]Aerial vehicles such as unmanned aerial vehicles can be used for performing surveillance, reconnaissance, and exploration tasks for military and civilian applications. Such vehicles may carry a payload configured to perform a specific function. These aerial vehicles may take off and land on a surface.[0003]However, when traditionally controlled aerial vehicles take off from a surface, the feedback control systems used combined with the force provided by the surface can cause initial instability. Particularly, when a surface is sloped, the takeoff may not be vertical, and there may be a greater probability of crashing or falling over. The takeoff often presents a challenge for users, particularly inexperienced users, and if the aircraft i...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): B64D31/06B64C27/00B64C39/02B64C29/00B64D27/00
CPCB64D31/06B64C29/00B64D27/00B64C2201/14B64C27/00B64C2201/088B64C39/024G05D1/101G05D1/0669B64U10/14B64U10/70B64U2201/00G05D1/042G05B11/42B64U2101/60B64U2201/10
Inventor SHI, JUNPAN, XU YANG
Owner SZ DJI TECH CO LTD
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