Radar Detection System for Non-Contact Liftgate Activation
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Solution Overview
Problem
Current radar detection systems for motor vehicles require alterations to the vehicle body to function effectively, as they rely on ultrasonic sensors that need openings for signal emission, and may incorrectly activate the rear liftgate due to external factors like weather or animals, lacking user-friendly, non-contact activation.
Innovation Solution
A radar detection system using radar sensors to transmit and receive waves, coupled with an electronic control unit that analyzes motion and characteristics to determine valid user gestures for activating a powered closure member, such as a liftgate, without the need for body alterations, ensuring accurate user activation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Difficulty of detecting and measuring
If ultrasonic sensors are used for motion detection, then motion detection capability is provided, but vehicle body alterations are required to allow signal emission
Solution Approach 1:
The patent replaces ultrasonic sensors with radar sensors that use electromagnetic waves instead of mechanical sound waves. This substitution eliminates the need for vehicle body openings or alterations, as radar waves can penetrate or reflect off surfaces without requiring physical access points in the vehicle body.
Solution Approach 2:
The patent changes the detection parameter from ultrasonic frequency to radar frequency (electromagnetic wave frequency). This parameter change allows the detection system to function through existing vehicle body materials without requiring modifications, as radar waves interact differently with materials compared to ultrasonic waves.
2Ease of operation
If detection systems are made sensitive to detect user gestures, then user-friendly non-contact activation is achieved, but false activations from external factors increase
Solution Approach 1:
The patent implements dynamic gesture recognition that analyzes the temporal and spatial characteristics of detected motions. The system distinguishes between intentional user gestures (with specific velocity, acceleration, and trajectory patterns) and random external movements (such as animals or weather effects) by evaluating whether the motion dynamics match predefined user gesture profiles.
Solution Approach 2:
The system incorporates feedback mechanisms that continuously monitor detection patterns and adjust sensitivity thresholds. By analyzing the consistency and repeatability of detected gestures, the system can differentiate between deliberate user actions and spurious signals from external factors, reducing false activations while maintaining user-friendly operation.
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
The system provides a user-friendly, non-contact method for activating the rear liftgate, enhancing convenience and accuracy by using radar technology to sense through polymers and differentiate valid user gestures, reducing false activations and body modification needs.
Implementation Method 1
at least one radar sensor assembly including at least one radar transmit antenna for transmitting radar waves and at least one radar receive antenna for receiving the radar waves after reflection from an object in a detection zone
Implementation Method 2
The at least one radar sensor assembly is coupled to the vehicle body for sensing a motion of the object in the detection zone
Data Source
AI summary
A radar detection system for activation of a powered closure member of a vehicle and corresponding method are provided. The system includes a radar sensor assembly having a radar transmit antenna for transmitting radar waves and a radar receive antenna for receiving the radar waves after reflection from an object in a detection zone. The radar sensor assembly outputs a sensor signal corresponding to the motion of the object in the detection zone. An electronic control unit is coupled to the radar sensor assembly and includes a data acquisition module to receive the sensor signal and a plurality of analysis modules to analyze the sensor signal to detect extracted features and determine whether extracted features are within predetermined thresholds representing a valid activation gesture. The electronic control unit initiates movement of the closure member in response to the extracted features being within the predetermined thresholds representing the valid activation gesture.