Vehicle Door Warning Logic for Occluded Rear Approaching Traffic

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Solution Overview

Problem

Existing vehicle warning systems fail to accurately distinguish between stationary objects and mobile objects, leading to erroneous notifications that can prevent occupants from being warned of approaching vehicles, particularly when stationary objects like parked vehicles interfere with sensor readings.

Innovation Solution

A warning apparatus and method that utilizes a combination of sensors (millimeter wave radar, ultrasonic wave sensors, and exterior cameras) to detect mobile and stationary objects, with an ECU processing the data to predict approaching mobile objects and issue warnings while avoiding false negatives due to stationary objects with projections.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Measurement precision

If the sensor detects objects behind the vehicle without distinguishing between stationary and mobile objects, then the warning system can detect all potential objects, but false detections occur due to stationary objects like parked vehicles causing reflection interference

Engineering Contradiction:
Improveobject detection accuracyVSAvoidwarning notification reliability
Core Design Contradiction:
Measurement precisionVSReliability

Solution Approach 1:

The detection system is segmented into two independent detection paths: one for stationary objects and one for mobile objects. Each path uses the same sensor but processes data independently with different algorithms. The stationary object detection identifies parked vehicles and other fixed obstacles, while the mobile object detection focuses on moving vehicles. This segmentation allows the system to apply appropriate filtering and validation rules to each type, reducing false detections while maintaining comprehensive coverage.

Inventive Principle:
Principle #1Segmentation

2Reliability

If the warning system refrains from notifying the occupant when a stationary object is detected ahead of the mobile object, then false warnings are prevented, but legitimate warnings may be suppressed when the stationary object is merely a projection

Engineering Contradiction:
Improvewarning notification reliabilityVSAvoidwarning information completeness
Core Design Contradiction:
ReliabilityVSLoss of information

Solution Approach 1:

The system introduces an intermediary classification layer between object detection and warning issuance. When an object is detected ahead of the mobile object, the system uses image recognition and geometric analysis to determine whether it is a projection (such as an outer mirror) or a complete vehicle. This intermediary classification enables nuanced decision-making: projections do not suppress warnings, while complete stationary vehicles do. This resolves the contradiction by providing discriminative information that guides the warning suppression logic.

Inventive Principle:
Principle #24Intermediary (Mediator)

3Area of stationary object

If the sensor detects objects through reflection by stationary objects, then the detection range is extended, but erroneous detections occur that prevent proper warning issuance

Engineering Contradiction:
Improvedetection coverage areaVSAvoidobject detection accuracy
Core Design Contradiction:
Area of stationary objectVSMeasurement precision

Solution Approach 1:

The system uses exterior cameras to capture visual information and analyze the appearance, shape, and context of detected objects. By examining visual characteristics such as vehicle color, shape contours, and positional relationships, the system can distinguish between actual vehicles and reflection artifacts. The image recognition algorithm identifies patterns consistent with vehicle projections versus complete vehicles, enabling accurate classification even when objects are detected through reflection by stationary objects.

Inventive Principle:
Principle #32Color changes

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

Effectively warns occupants of approaching vehicles by distinguishing between mobile and stationary objects with projections, preventing erroneous warnings and ensuring timely notifications.

Implementation Method 1

a millimeter wave radar 11, an ultrasonic wave sensor 12, and an exterior camera 13

Methodology Applied
Scientific EffectRadar: Radar

Implementation Method 2

a millimeter wave radar 11, an ultrasonic wave sensor 12, and an exterior camera 13

Methodology Applied
Scientific EffectUltrasonic wave reflection: Ultrasound

Data Source

PatentUS20250383441A1Warning apparatus and warning method
Publication Date: 2025.12.18 TOYOTA JIDOSHA KK
  • US20250383441A1 patent drawing
  • US20250383441A1 patent drawing
  • US20250383441A1 patent drawing

AI summary

A warning apparatus for warning an occupant of a vehicle includes: a mobile object detection section that detects a mobile object behind the vehicle based on output data of sensors; a stationary object detection section that detects a stationary object behind the vehicle based on output data of sensors; and a warning section that warns the occupant when the mobile object is predicted to approach and arrive at a door of the vehicle. The warning section refrains from issuing the warning when the stationary object is detected to be located ahead of the mobile object even if the mobile object is predicted to approach and arrive at the door, and does not refrain from issuing the warning when the stationary object is another vehicle including a projection that projects in a vehicle width direction even when the stationary object is detected to be located ahead of the mobile object.