Vehicle Travel Control Device Dynamic Warning Threshold
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Solution Overview
Problem
Existing vehicle travel control systems do not provide drivers with an alarm indicating the degree of risk of detected obstacles, as they only initiate camera recording and video shooting based on ultrasonic sensor detection without considering the obstacle's proximity and vehicle speed.
Innovation Solution
A travel control device and method that incorporate ultrasonic obstacle detection, image capture, rearward movement preparation detection, and a warning system, where the warning threshold is adjusted based on vehicle speed and obstacle proximity, ensuring timely alerts by setting a constant threshold during rearward movement preparations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the activation threshold is adjusted according to vehicle speed (higher speed = larger threshold), then false warnings are reduced during normal operation, but warnings may not be issued timely when the vehicle prepares to move rearward with an obstacle present
Solution Approach 1:
The activation threshold is made dynamic by switching between two control modes: normally it varies with vehicle speed, but when rearward movement preparation is detected and an obstacle is present, it switches to a constant lower value to ensure timely warnings
Solution Approach 2:
The system changes the parameter (activation threshold) based on detected conditions - specifically changing from a speed-dependent threshold to a constant threshold when rearward movement preparation and obstacle presence are detected
2Ease of operation
If only ultrasonic sensor detection is used to trigger camera recording, then the system is simple to operate, but no alarm indicating obstacle risk degree is provided to the driver
Solution Approach 1:
The warning unit acts as an intermediary that translates sensor data (ultrasonic detection, image recognition) into meaningful risk information for the driver, adding the alarm function without complicating the basic detection 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 effectively provides drivers with timely and risk-based alerts by adjusting warning thresholds according to vehicle speed and obstacle proximity, enhancing safety by changing the timing of warnings based on the detected risk level.
Implementation Method 1
an ultrasonic obstacle detection unit that detects an obstacle entering a rear side of a vehicle and a distance to the obstacle
Data Source
Figure 1
Figure 2
Figure 3~4
AI summary
A travel control device includes ultrasonic obstacle detection sensors (13e to 13h) which detect an obstacle entering a rear side of a vehicle (1) and a distance to the obstacle by using ultrasonic waves, and an image obstacle detection unit (44) which detects the obstacle entering the rear side of the vehicle (1) by using an image of a range including the rear side of the vehicle (1). If a distance (DOD) to the obstacle detected by the ultrasonic obstacle detection sensors (13e to 13h) is equal to or less than an activation threshold (SSV) for warning, the travel control device issues a warning, and sets the activation threshold (SSV) larger as the vehicle speed of the vehicle (1) becomes higher. If the vehicle (1) is detected preparing to move rearward and the image obstacle detection unit (44) detects the obstacle, the travel control device performs control to set the activation threshold (SSV) to a constant value regardless of the vehicle speed of the vehicle (1).