Blind Spot Monitoring Ultrasonic Sensor Signal Verification
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Solution Overview
Problem
Blind spot monitoring systems using ultrasonic sensors often generate false warnings due to the inability to differentiate between the reflection of their own transmitted pulse and signals from other ultrasonic sources, particularly when multiple vehicles equipped with similar systems are in proximity.
Innovation Solution
Incorporating additional ultrasonic sensors from a parking assist system to verify whether the detected signal is a reflection of the own signal or an external ultrasonic source, by activating them in an energy-saving listening mode when the driver indicates a lane change or when driving above a certain speed, allowing for a plausibility check and reducing false warnings.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If additional ultrasonic sensors are added to verify detected signals, then reliability of detection is improved, but device complexity increases
Solution Approach 1:
The patent applies multi-functionality by enabling existing parking assist ultrasonic sensors to serve dual purposes: their original parking detection function and additional blind spot verification function. This allows the system to improve detection reliability without adding dedicated new sensors, as the same hardware resources are utilized for multiple detection tasks.
Solution Approach 2:
The system employs self-service by having the existing sensor network perform verification of detections made by other sensors in the network. The parking assist sensors automatically participate in verifying blind spot detections without requiring external additional hardware, utilizing the system's own resources to eliminate false positives.
2Measurement precision
If ultrasonic sensors are used for blind spot monitoring, then detection capability is improved, but false warnings increase due to inability to differentiate own signal reflections from external ultrasonic sources
Solution Approach 1:
The patent implements feedback by using the sensor network to cross-verify detections. When a sensor detects a potential object, other sensors provide feedback information about whether they also detect signals consistent with that object. This feedback mechanism allows the system to distinguish between real objects and false reflections, improving warning accuracy.
Solution Approach 2:
The system merges the detection capabilities of multiple sensor systems (side view assist sensors and parking assist sensors) into a unified detection approach. By combining the data from both sensor types, the system achieves more reliable object verification and reduces false warnings through cross-validation.
3Reliability
If additional sensors are installed to verify detections, then false warnings are reduced, but installation costs and space increase
Solution Approach 1:
The patent eliminates the need for additional dedicated verification sensors by making existing parking assist sensors perform dual functions. This multi-functional approach reduces installation costs and space requirements while still achieving the goal of reducing false warnings through cross-verification.
Solution Approach 2:
The system uses its own existing sensor infrastructure to provide verification functionality, eliminating the need for external additional hardware. The parking assist sensors serve themselves and the blind spot monitoring system simultaneously, reducing overall system cost and complexity.
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
This approach enables reliable detection of approaching vehicles and stationary objects in the blind spot, significantly reducing false warnings and improving the functionality of side view assist systems without the need for additional sensors, thereby enhancing safety and reducing installation costs and space.
Implementation Method 1
These ultrasonic sensors function as transceiver units. These so-called SVA ultrasonic sensors emit a query signal to search for objects in the blind spot. If an object is located in the blind spot, the query signal is reflected by the object and at least partially sent back to the same sensor.
Data Source
AI summary
A device for detecting a moving object in a blind spot includes: at least one first ultrasonic sensor of a side view assist system; and a control unit for determining the distance and/or speed and/or position of the moving object. The control unit processes at least one signal of a second ultrasonic sensor of a driving assistance system for monitoring the blind spot.