Radar-Based Hand Detection for Reliable Operating Devices
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Summary
Problems
Existing hand presence detection systems on operating devices, such as joysticks, suffer from false-positive and false-negative detections due to electromagnetic interference, temperature and humidity sensitivity, and issues with gloves, particularly with capacitive measurements.
Innovation solutions
Employing a radar sensor within the handle of the operating device to detect hand presence, which avoids the need for metal plates and reduces electromagnetic interference, and uses radar wave attenuation to distinguish between a user's hand gripping the handle and other objects.
TRIZ Analysis
Specific contradictions:
General conflict description:
Principle concept:
If capacitive measurement with metallic elements is used to detect hand presence, then detection can be implemented, but false-positive detections occur due to metallic objects acting as antennas and electromagnetic interference
Why choose this principle:
The patent replaces capacitive measurement (electrical field-based) with radar measurement (electromagnetic wave-based). The radar sensor emits electromagnetic waves that penetrate the handle casing and are absorbed by the hand, providing reliable detection without the false positives associated with capacitive sensors and metallic elements.
Principle concept:
If capacitive measurement with metallic elements is used to detect hand presence, then detection can be implemented, but false-positive detections occur due to metallic objects acting as antennas and electromagnetic interference
Why choose this principle:
The patent removes metallic elements from the handle casing that were previously used for capacitive detection. By extracting these problematic metallic components, the system eliminates the source of electromagnetic interference and false-positive detections while maintaining hand presence detection capability through radar.
Application Domain
Data Source
AI summary:
Employing a radar sensor within the handle of the operating device to detect hand presence, which avoids the need for metal plates and reduces electromagnetic interference, and uses radar wave attenuation to distinguish between a user's hand gripping the handle and other objects.
Abstract
An operating device for a machine is provided, for example for an agricultural or constructional vehicle. The operating device (10) comprises a handle (11) configured to be gripped by a hand (100) of a user. The operating device (10) comprises a presence detector (15) configured to detect a presence of the hand (100) on the handle (11). The presence detector (15) comprises a radar sensor (20) providing a radar sensor signal, wherein the presence detector (15) is configured to estimate the presence of the hand (100) using the radar sensor signal.