Blind Spot Alert Control for High-Speed Overtaking Detection
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Solution Overview
Problem
Existing blind spot monitors face challenges in extending the region of active alert function while minimizing unnecessary operations, particularly during overtaking scenarios, due to limitations in detection capability and calculation periods, leading to potential errors in distinguishing stationary and moving objects.
Innovation Solution
A vehicle alert device with advanced control means that adjusts the calculation period and relative speed threshold based on the vehicle's speed, using radar sensors to detect targets and exclude stationary objects, and activates alerts only when the target is within the blind spot area and moving at a relative speed below a predetermined threshold.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the set calculation period is reduced to extend the region of active alert function, then the productivity is improved, but the measurement precision deteriorates leading to erroneous determination of stationary objects
Solution Approach 1:
The patent applies dynamics by making the calculation period adjustable rather than fixed. The control unit dynamically changes the calculation period length based on vehicle speed: using a shorter period at high speeds to extend alert coverage, and a longer period at low speeds to maintain determination precision. This resolves the contradiction by adapting the system parameters to operating conditions.
Solution Approach 2:
The patent changes the parameter of calculation period length based on vehicle speed conditions. By setting different calculation period lengths for different speed ranges, the system extends the active alert region at high speeds while preserving measurement precision at low speeds, thus resolving the technical contradiction between productivity and measurement precision.
2Measurement precision
If the set calculation period is extended to improve determination precision, then the measurement precision is improved, but the loss of time increases causing delayed alerts
Solution Approach 1:
The system dynamically adjusts the calculation period based on vehicle speed. At high speeds where rapid detection is critical, a shorter calculation period is used to minimize alert delay. At low speeds where precision is more critical, a longer calculation period is used to ensure accurate determination. This dynamic adjustment resolves the contradiction between measurement precision and time loss.
Solution Approach 2:
The calculation period parameter is changed according to vehicle speed conditions. The control unit selects appropriate calculation period lengths to balance determination precision and alert timing, preventing both excessive delays and erroneous determinations.
3Adaptability or versatility
If the function is activated at higher overtake speeds to extend the active region, then the adaptability is improved, but the measurement precision deteriorates causing unnecessary operations
Solution Approach 1:
The system dynamically adapts the calculation period to vehicle speed conditions. When overtaking at higher speeds, a shorter calculation period is used to maintain determination accuracy despite the reduced time available. This allows the system to remain adaptable to high-speed overtaking scenarios while preventing erroneous determination of stationary objects.
Solution Approach 2:
The calculation period parameter is adjusted based on overtake speed conditions. By shortening the calculation period at higher speeds, the system maintains measurement precision across a wider range of operating conditions, enabling broader adaptability without sacrificing accuracy.
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 solution effectively extends the region of active alert function while reducing unnecessary operations by optimizing detection precision and timing, ensuring accurate alerts and minimizing errors, even at higher vehicle speeds.
Implementation Method 1
Such a blind spot monitor generally uses a radar sensor to detect an alert-target object, for example, another vehicle
Implementation Method 2
The blind spot monitor changes a condition for finishing the operation of the notification device in accordance with a relative speed between the own vehicle and the other vehicle
Data Source
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AI summary
A vehicle alert device (10) executes alert control of determining, when a target is detected in a periphery of an own vehicle (C1), within a set calculation period, whether the target is an alert-target object that does not include a stationary object, determining, when the target is an alert-target object, whether the alert-target object exists in a blind spot area (RL, RR) of a driver, and alerting the driver when the alert-target object exists in the blind spot area. The vehicle alert device avoids executing the alert control when a relative speed of the own vehicle with respect to the alert-target object at a time when the own vehicle overtakes the alert-target object is equal to or higher than a predetermined threshold value. The vehicle alert device sets the predetermined threshold value to a larger value and sets the set calculation period to a shorter value, when a travel speed of the own vehicle at the time when the own vehicle overtakes the alert-target object is equal to or higher than a predetermined speed, than the predetermined threshold value and the set calculation period at a time when the travel speed of the own vehicle is lower than the predetermined speed.