Adaptive Haptic Feedback for Agricultural Control Interfaces
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Solution Overview
Problem
Existing user interfaces for agricultural machines lack effective haptic feedback mechanisms to enable operators to distinctly recognize and differentiate various settings, control demands, and operating states.
Innovation Solution
A user interface with a moveable input element and a feedback actuator that induces haptic feedback through a force feedback characteristic with adjustable ripple characteristics, allowing the control unit to change the ripple characteristics based on specific settings, control demands, or operating states.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of information
If optical feedback means (dial indicators, meters, light indicators, displays) are used to indicate settings and operating states, then information can be displayed to the operator, but the operator cannot haptically recognize and distinguish different settings and states
Solution Approach 1:
The haptic feedback is segmented into distinct ripple patterns, where different ripple characteristics (frequency, amplitude, waveform shape) represent different settings and operating states. This segmentation allows the operator to distinguish multiple states through tactile sensation alone, without relying on optical displays.
Solution Approach 2:
The system implements closed-loop haptic feedback by continuously monitoring the input element position and adjusting the ripple characteristics in real-time based on the relationship between current and setpoint positions. This feedback mechanism provides the operator with immediate tactile information about system state and deviation from target.
2Loss of information
If a feedback actuator provides haptic feedback with fixed ripple characteristics, then the operator receives consistent tactile feedback, but the operator cannot distinguish between different settings, control demands, and operating states
Solution Approach 1:
The ripple characteristics are made dynamic and adjustable rather than fixed. The control unit continuously adapts the ripple parameters (frequency, amplitude, waveform shape) based on the current operating state, setpoint position, and deviation magnitude. This dynamic adaptation enables the same haptic feedback mechanism to convey multiple different states and information.
Solution Approach 2:
The system changes multiple parameters of the haptic feedback simultaneously, including ripple frequency, amplitude, and waveform shape, to encode different operating states and control demands. By varying these parameters, the system can provide distinct tactile signatures for different settings and states without requiring additional physical indicators.
3Measurement precision
If the ripple characteristic is adjusted continuously based on position deviation, then the haptic feedback provides precise guidance, but the system complexity increases
Solution Approach 1:
The system replaces complex mechanical feedback mechanisms with an electronic control approach. Instead of using multiple physical springs or mechanical linkages to provide different tactile sensations, a single feedback actuator with electronically controlled ripple characteristics achieves the same guidance function through software-based parameter adjustment, reducing mechanical complexity.
Solution Approach 2:
A single feedback actuator performs multiple functions by dynamically adjusting its ripple characteristics. The same actuator provides both the force feedback for position control and the informational haptic feedback for state indication, eliminating the need for separate indicators and simplifying the overall system architecture.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
Enables operators to haptically recognize and distinguish different settings, control demands, and operating states by providing a tailored haptic feedback experience, enhancing operator control and safety.
Implementation Method 1
The actuator may be of a magnetorheological type
Implementation Method 2
The feedback actuator may be of electric, piezoelectric, magnetic, hydraulic, magnetorheological, electrorheological or of any other type
Data Source
AI summary
A user interface for controlling an agricultural machine and a method of adjusting a haptic feedback of an user interface including method acts for determining a set point position, determining a current position of the input element, and adjusting a ripple characteristic of at least one ripple according to a second ripple characteristic being different to a first ripple characteristic if the at least one ripple is located within an adjustment range extending between the set point position and the current position of the input element.