Predictive Speed Warning System for Comfortable Deceleration
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Solution Overview
Problem
Conventional speed warning systems in navigation devices only provide warnings when the vehicle is already on a section of road with a speed limit and offer limited options to drivers, often requiring emergency braking or exceeding the speed limit, due to their hard coupling with the current vehicle position.
Innovation Solution
A driver information device that includes a locating unit, speed detection, and a route monitoring system, which provides a braking recommendation before entering a speed-limited area and transitions to a warning if comfortable braking is no longer possible, using a definable deceleration profile and considering vehicle-specific, driving-style, and environmental factors.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If conventional speed warning systems only warn when the vehicle is already on a speed-limited section, then the system complexity remains low, but the driver has limited options and must perform emergency braking or exceed the speed limit
Solution Approach 1:
The system performs preliminary action by detecting upcoming speed-limited sections ahead of the vehicle and issuing braking recommendations before the vehicle enters these sections. The locating unit determines current position, the route monitoring device identifies upcoming speed limits, and the system calculates recommended braking points, allowing the driver to reduce speed gradually and comfortably rather than performing emergency braking.
2Ease of operation
If the system provides braking recommendations in good time, then the driver can reduce speed comfortably, but the system must process route information ahead of the vehicle
Solution Approach 1:
The route monitoring device performs preliminary detection of speed-limited sections ahead of the vehicle's current position. By identifying upcoming speed limits and calculating the distance to these sections, the system can provide braking recommendations in advance, allowing comfortable speed reduction while managing the complexity through structured route information processing.
Solution Approach 2:
The system introduces an intermediary processing layer that receives route information, identifies speed-limited sections, calculates distances to these sections, and determines optimal braking recommendation points. This intermediary structure manages the complexity by systematically processing route data and translating it into actionable braking recommendations for the driver.
3Reliability
If the system transitions from braking recommendation to warning when comfortable braking is no longer possible, then the driver receives timely warnings, but the system must continuously assess braking feasibility
Solution Approach 1:
The system implements feedback by continuously monitoring the vehicle's current speed, position, and distance to upcoming speed-limited sections. Based on this feedback, the system dynamically assesses whether comfortable braking is still feasible and transitions from issuing braking recommendations to providing warnings when the vehicle can no longer be braked to the maximum speed with a predefinable deceleration profile.
Solution Approach 2:
The system applies dynamics by adapting its warning strategy based on real-time conditions. When the vehicle is far enough from the speed-limited section, the system provides braking recommendations. As the vehicle approaches and comfortable braking becomes impossible, the system dynamically transitions to issuing warnings, optimizing the reliability of speed limit compliance based on current vehicle state and position.
Data Source
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AI summary
The device has a location unit for determining an actual vehicle position, and a detection unit for detecting actual vehicle speed, and an output unit for outputting of information (SI) to a driver. A monitoring device monitors an output of a brake reference (BH) during actual exceeding of preset high speed so that the actual vehicle speed is reduced to the preset high speed. The brake reference is changed by a warning (SW) relative to the high speed when a vehicle is not braked at the preset high speed in a defined position by a delay process.