Vehicle Speed Control With Automatic Speed Limit Offset Reapplication
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Solution Overview
Problem
Existing automatic speed control systems for vehicles require users to manually reapply speed limit offsets after changes in speed limits, which can be inconvenient, especially when speed limit changes are temporary or occur frequently.
Innovation Solution
An automatic speed control system that obtains an initial speed limit, applies a user-defined offset, and automatically adjusts the vehicle speed to an updated speed limit when specific criteria are met, such as when the speed limit returns to its original value or when the temporary speed limit ends, thereby reducing user inconvenience.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the adaptive cruise control system automatically adjusts vehicle speed based on speed limit changes, then the ease of operation is improved, but the device complexity increases due to additional memory and comparison functions
Solution Approach 1:
The system stores the initial speed limit value in memory before any changes occur. This preliminary storage action enables the system to automatically compare future speed limit changes against the stored value and automatically reapply offsets when the original speed limit is restored, eliminating the need for manual user intervention and reducing operational complexity.
Solution Approach 2:
The system continuously monitors speed limit changes and compares them against the stored initial speed limit value. When the current speed limit matches the stored initial value, the system automatically triggers the reapplication of the offset, creating a closed-loop feedback mechanism that maintains ease of operation while managing complexity through intelligent control logic.
2Productivity
If the system stores and compares speed limit values to automatically reapply offsets, then the productivity is improved by reducing manual operations, but the loss of time increases due to additional processing steps
Solution Approach 1:
The system performs the time-consuming storage and comparison setup in advance, when the initial speed limit is first obtained. This preliminary action prepares the system for rapid automatic response to future speed limit changes, improving productivity by eliminating the need for manual user actions while minimizing time loss through efficient pre-positioning of data.
Solution Approach 2:
The system serves itself by automatically monitoring speed limit changes, comparing them against stored values, and triggering offset reapplication without requiring user intervention. This self-service capability improves productivity by automating the entire process, and the time loss is minimized because the system only processes actions when necessary conditions are met.
Data Source
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Figure 3(a)~3(b)
AI summary
Aspects of the present invention relate to an automatic speed control system, a method (200) for automatically controlling the speed of a vehicle, and a vehicle comprising the system or for carrying out the method. The system and method obtains (202) an initial speed limit, wherein the initial speed limit is the speed limit at a location of the vehicle, receives (204) a signal identifying a speed limit offset; and sets (206) the speed of the vehicle to the initial speed limit combined with the offset. The system and method may obtain (208) an updated speed limit and set (210) the speed of the vehicle to the updated speed limit. The system and method may obtain (212) a further speed limit; and if at least one criterion is met (214), set (216) the speed of the vehicle to the further speed limit combined with the offset.