Radio Control Transmitter Pitch Roll Range Correction

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Solution Overview

Problem

Radio control transmitters for model helicopters face mechanical limitations in the control range of swash plates, leading to saturation when pitch and roll controls are combined, resulting in excessive load on servos and potential damage.

Innovation Solution

A radio control transmitter that calculates the added control range of pitch and roll controls and corrects it when it exceeds the maximum control range, using a CPU to adjust the control signals and prevent overload on the swash plate and servos.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Adaptability or versatility

If the control range of pitch and roll is extended beyond mechanical limits, then the control range is improved, but the servo and linkage rod are subjected to excessive load

Engineering Contradiction:

Improvecontrol rangeVSAvoidload on servo and linkage rod

Core Design Contradiction:

Adaptability or versatilityVSStrength

Solution Approach 1:

The transmitter calculates the added control range before transmitting the control signal and corrects it in advance when it exceeds the maximum control range. This preliminary calculation and correction prevents excessive load from being applied to the servo and linkage rod, while still allowing the operator to use the full range of stick lever motion for control input.

Inventive Principle:

Principle #10Preliminary action

2Strength

If the maximum control range is set by mechanical stopper, then the excessive load is prevented, but the control range cannot be extended for acrobatic flying

Engineering Contradiction:

Improveprotection from excessive loadVSAvoidcontrol range for acrobatic flying

Core Design Contradiction:

StrengthVSAdaptability or versatility

Solution Approach 1:

The patent replaces the mechanical stopper system with a computational correction system in the transmitter. The CPU calculates the added control range and corrects it when necessary, eliminating the need for mechanical stoppers. This allows the full control range to be available for acrobatic maneuvers while still preventing excessive load through software-based correction.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

3Ease of operation

If individual control ranges are maximized for pitch and roll, then the maneuverability is improved, but the combined control range exceeds mechanical limits

Engineering Contradiction:

ImprovemaneuverabilityVSAvoidexcessive load on operating section

Core Design Contradiction:

Ease of operationVSObject-affected harmful factors

Solution Approach 1:

The transmitter performs preliminary calculation of the added control range before the control signal is transmitted. When the combined control range exceeds the maximum, the correction is applied in advance, allowing the operator to maintain full maneuverability with individual pitch and roll controls without causing excessive load on the helicopter's operating sections.

Inventive Principle:

Principle #10Preliminary action

Data Source

PatentUS7990306B2Radio control transmitter for models

Publication Date: 2011.08.02 FUTABA CORPORATION

AI summary

A radio control transmitter for a model is disclosed wherein a control range is limited to not to exceed a maximum control range without using a mechanical means. In accordance with the transmitter, an added control range being a sum of two or more of the control ranges is calculated, whether the added control range exceeds a maximum control range set to correspond to the operating section of the object to be controlled is determined, and the control range is corrected when the added control range exceeds the maximum control range.