Automotive Authorization Control Using Radar Motion Pattern Recognition
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Solution Overview
Problem
Existing vehicle entry systems, such as those using capacitive sensing and radar, face challenges in accurately detecting user intention without requiring special dexterity, particularly in environments with contaminants or when users are carrying loads, and often have limitations in range and sensitivity due to vehicle metal surfaces.
Innovation Solution
A two-sided system comprising a base station with an electronic control unit (ECU) and a mobile tag that communicates via low-frequency and radio-frequency signals, using radar and inertial navigation to detect and authenticate user actions, allowing for hands-free vehicle entry without special dexterity and improved range and accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Extent of automation
If capacitive sensing or radar is used for vehicle entry detection, then automation is improved, but measurement precision deteriorates due to metal surfaces and environmental contaminants
Solution Approach 1:
The patent introduces an intermediary authorization control device integrated into the vehicle's existing structure (door handle, mirror, or antenna) that mediates between the user and the vehicle system. This intermediary contains capacitive sensors and processors that detect touch patterns and authorization codes, translating physical user actions into digital authentication signals while being shielded from environmental interference by its integrated placement
Solution Approach 2:
The patent replaces unreliable mechanical detection methods (kick sensors under the vehicle, foot stamps) with electronic capacitive sensing technology integrated into existing vehicle components. This substitution enables more precise detection of user intent through electrical field changes rather than mechanical force detection, improving accuracy while maintaining automation
2Ease of operation
If sensors are placed under the vehicle for kick detection, then ease of operation is improved, but reliability deteriorates due to contaminants like mud and snow
Solution Approach 1:
Instead of placing sensors under the vehicle where they are exposed to contaminants, the patent inverts the approach by integrating capacitive sensors into existing vehicle components that are naturally protected from the environment (door handles, mirrors, antennas). This inversion maintains hands-free operation convenience while eliminating the reliability issues caused by mud, snow, and other contaminants
Solution Approach 2:
The patent makes existing vehicle components serve multiple functions: the door handle not only provides mechanical entry but also houses capacitive sensors for touch detection; the mirror or antenna serves both its original purpose and as a mounting location for authorization control sensors. This multi-functionality improves reliability by using protected, existing structures rather than adding vulnerable new sensor locations
3Ease of operation
If facial recognition or voice recognition is used for authorization, then ease of operation is improved, but reliability deteriorates in noisy environments or when guests are present
Solution Approach 1:
The system allows the vehicle to authenticate users through touch-based capacitive sensing that the user initiates themselves by naturally touching vehicle components during normal interaction (opening door, adjusting mirror). This self-service approach eliminates the need for external recognition systems that fail in noisy environments or with unrecognized faces, while maintaining high reliability through user-initiated authentication
Solution Approach 2:
The capacitive sensor acts as an intermediary that translates natural physical contact (touching the door handle or mirror) into digital authentication signals. This intermediary layer provides a universal authorization method that works reliably for all users including guests, without requiring pre-registration or being affected by environmental noise, thereby improving both ease of operation and reliability
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 hands-free vehicle entry with enhanced accuracy and reliability, avoiding misinterpretation of user actions and improving functionality over existing systems by using radar to detect specific movement patterns and inertial navigation for precise location and velocity data.
Implementation Method 1
a radar transmitter and a radar receiver monitoring for performance of the triggering pattern
Implementation Method 2
An accelerometer is activated after the ECU detects the mobile tag within the mutual recognition zone. The accelerometer employs inertial navigation to determine inertial navigation data of at least position, orientation, and velocity of the monitored target
Data Source
AI summary
An authorization controller on a first side of a two-sided system communicates with an accelerometer on the second side for tracking the second side by inertial navigation. The authorization controller activates a radar transmitter and receiver installed on a car to include a plurality of spaced apart transmitting and receiving radar antennas to track the second side by radar. Coherent pulse or Doppler radar waveform tracks motion of an approaching user carrying a tag on the second side that is paired with the car on the first side. The authorization controller uses the radar to look for a pre-programmed pattern of user movement such as a “step in, wait, step out” pattern. Recognition of the programmed pattern activates an associated action from the authorization controller, such as opening or closing a tailgate or side door of the car. The same radar technology can be used with different programmed movement patterns to trigger the opening or closing of side doors, opening/closing of regular doors, deployment of a handicap ramp, deployment of side steps, or other chosen functions that can be initiated by electronic response. Reversing this functionality, the tag may be stationary in a garage and the car may approach the garage, causing operation of the garage door. Other functions inside a house are similarly controlled.