Joystick Dead Zone Control for Propulsion Device
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Solution Overview
Problem
Existing systems for controlling propulsion devices using a joystick do not have a mechanism to prevent sudden movements of the propulsion device when the joystick is operated within a certain range, leading to unintended control actions.
Innovation Solution
The implementation of a dead zone mechanism in the joystick control system, where the controller pauses the shifting and steering actions of the propulsion device when the joystick is positioned within specific dead zones, including the neutral position and a rearward dead zone.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the joystick is operated within a certain range without a dead zone mechanism, then the propulsion device responds immediately to joystick operations, but sudden unintended movements occur leading to reduced control precision
Solution Approach 1:
The control range of the joystick is segmented into multiple zones: a first dead zone including the neutral position where both shifting and steering are paused, a second dead zone rearward of the first where shifting is paused but steering is enabled, and an active zone where full control is responsive. This segmentation prevents sudden movements by creating buffer zones while maintaining precise control where needed.
Solution Approach 2:
Different control responses are applied to different spatial regions of the joystick range. The first dead zone applies a pause to both shifting and steering operations, the second dead zone applies a pause only to shifting while allowing steering, and the active zone allows full responsive control. This local differentiation resolves the contradiction by providing precision control in active zones while preventing harmful sudden movements in dead zones.
2Ease of operation
If the joystick operates continuously without dead zones, then the propulsion device maintains continuous responsiveness, but the operator cannot distinguish between intentional and unintentional control inputs
Solution Approach 1:
The joystick control range is divided into distinct operational zones with different response characteristics. Dead zones provide pause regions that filter out unintentional inputs, while active zones provide responsive control for intentional commands. This segmentation maintains overall responsiveness while enhancing reliability through selective pausing.
Solution Approach 2:
The dead zone acts as an intermediary buffer between the joystick input and the propulsion device response. When the joystick enters a dead zone, the controller pauses the transmission of control signals, effectively mediating between the operator's input and the device's action. This intermediary mechanism filters out unreliable inputs while preserving reliable control pathways.
3Device complexity
If the controller responds to all joystick positions equally, then the system structure remains simple, but the propulsion device lacks the ability to pause operations in specific zones to prevent unintended movements
Solution Approach 1:
The control system segments the joystick range into distinct zones (first dead zone, second dead zone, and active zone) with different control responses. This segmentation adds minimal complexity by using positional thresholds to determine which pause logic to apply, while effectively preventing unintended control actions in dead zones.
Solution Approach 2:
The controller applies different control qualities to different spatial regions: pausing both shifting and steering in the first dead zone, pausing only shifting in the second dead zone, and allowing full control in the active zone. This local differentiation prevents harmful unintended actions without requiring complex system-wide changes.
Data Source
AI summary
When a joystick is positioned within a first dead zone including a neutral position, a controller pauses a shifting action and steering of a propulsion device regardless of a tilt operation and a twist operation of the joystick. When the joystick is positioned within a second dead zone located rearward of the first dead zone, the controller pauses the shifting action of the propulsion device regardless of the tilt operation of the joystick and controls the steering of the propulsion device in accordance with the twist operation of the joystick.