Vehicle Speed Limiting Device for Abnormal Tire Pressure
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Solution Overview
Problem
Conventional vehicles face reduced riding comfort, driving safety, and increased fuel consumption when tire air pressure deviates from the reference range, leading to potential accidents due to slip occurrences between the tire and road.
Innovation Solution
A speed limiting device that communicates with a tire air pressure monitor, steering angle detector, and yaw rate detector to acquire slip information and adjust the limited speed based on abnormal tire conditions, using a table to store and update speed information corresponding to tire and vehicle data, ensuring the engine operates within safe speed limits.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the vehicle operates without speed limitation when tire air pressure is abnormal, then the vehicle can maintain normal driving speed and productivity, but the driving safety is reduced and slip accidents may occur
Solution Approach 1:
The speed limiting device dynamically adjusts the vehicle speed limit based on real-time tire air pressure conditions and slip risk assessment. When abnormality information is detected, the device automatically limits the vehicle speed to a predetermined value, and this limitation is adaptively modified based on steering angle and yaw rate feedback, creating a dynamic safety mechanism that responds to changing driving conditions
Solution Approach 2:
The system continuously monitors tire air pressure, steering angle, and yaw rate to assess slip risk. When abnormality information is received, the controller acquires current steering angle and yaw rate, checks slip information against stored tables, and adjusts the speed limitation accordingly. This closed-loop feedback mechanism ensures that speed limitation is applied appropriately based on actual slip risk rather than being a fixed constraint
2Reliability
If the vehicle maintains normal operation without monitoring tire air pressure, then the device complexity is reduced, but the driving safety and riding comfort are compromised due to undetected slip conditions
Solution Approach 1:
The speed limiting device serves multiple functions: it monitors tire air pressure through communication with the tire air pressure monitor, detects slip risk by processing steering angle and yaw rate data, stores slip information in tables, and executes speed limitation control. This multi-functional integration reduces the need for separate dedicated systems while comprehensively addressing driving safety
Solution Approach 2:
The controller acts as an intermediary that receives abnormality information from the tire air pressure monitor and translates it into actionable speed limitation commands. It acquires steering angle and yaw rate data, checks slip information against stored tables, and outputs controlled speed limits to the engine controller, mediating between sensor inputs and actuator outputs in a coordinated manner
3Adaptability or versatility
If the vehicle uses fixed speed limitation when tire air pressure is abnormal, then the control system is simple, but it cannot adapt to different driving conditions and slip risks
Solution Approach 1:
The system transitions from fixed speed limitation to dynamic speed adjustment based on real-time driving conditions. When abnormality information is received, the controller acquires current steering angle and yaw rate, checks slip information against stored tables that contain multiple speed values for different conditions, and selects the appropriate limited speed. This dynamic adaptation allows the system to respond appropriately to varying steering inputs and vehicle motion states
Solution Approach 2:
The system changes the speed limit parameter based on detected driving conditions. The storage contains multiple limited speed values corresponding to different slip information scenarios, and the controller selects and applies the appropriate speed limit by changing this critical parameter according to the acquired steering angle and yaw rate data, enabling flexible adaptation without hardware changes
Data Source
AI summary
A speed limiting device may include a communicator configured to communicate with a tire air pressure monitor, a steering angle detector, a yaw rate detector and an engine controller of a vehicle; a storage configured to store limited speed information corresponding to slip information, in a form of a table; and a controller configured to acquire slip information based on a steering angle detected by the steering angle detector and a yaw rate detected by the yaw rate detector when abnormality information is received from the tire air pressure monitor, to check a limited speed corresponding to the acquired slip information, and to output the checked limited speed to the engine controller.