Dynamic Pressure Detection Interval for Vehicle Seat Bladder
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Solution Overview
Problem
The existing pneumatic pressure control systems for vehicle seats face issues with frequent operation of air intake and exhaust devices, leading to operating noise, vibration, and reduced durability, due to frequent detection and correction of internal bladder pressure, which is affected by temperature changes and air leaks.
Innovation Solution
A method that adjusts the detection interval for internal pressure based on the elapsed time since vehicle startup, shortening the interval initially to correct for temperature changes and lengthening it as the interior temperature stabilizes, thereby reducing the operational frequency of the air intake and exhaust device.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the internal pressure of the bladder is detected repeatedly at short intervals to maintain optimal pressure, then the pressure control precision is improved, but the operation frequency of the air intake and exhaust device increases, causing noise, vibration, and reduced durability
Solution Approach 1:
The detection interval is made dynamic rather than fixed. The control device adjusts the detection interval based on the operational state of the vehicle (moving vs. stopped). When the vehicle is moving, the detection interval is set to a longer period; when the vehicle is stopped, the detection interval is shortened. This dynamic adjustment allows frequent detection when needed (maintaining pressure control precision) while reducing unnecessary operations during driving (improving durability and reducing noise/vibration).
Solution Approach 2:
The system changes the parameter of detection interval based on vehicle operational conditions. By detecting whether the vehicle is moving or stopped and adjusting the detection interval accordingly, the system optimizes the balance between pressure control accuracy and device durability. This parameter change approach allows the system to adapt to different operational contexts and minimize unnecessary air pump operations.
2Measurement precision
If the detection interval is shortened to correct pressure changes due to temperature variations, then the pressure maintenance accuracy is improved, but the operation frequency of the air intake and exhaust device increases, generating more noise and vibration
Solution Approach 1:
The detection interval is dynamically adjusted based on vehicle operational state. During vehicle movement, when temperature changes are more stable, the detection interval is extended, reducing unnecessary operations and their associated noise and vibration. When the vehicle is stopped and temperature fluctuations are more likely, the detection interval is shortened to maintain accurate pressure control. This dynamic approach minimizes harmful noise and vibration while maintaining pressure accuracy when needed.
3Speed
If the air intake and exhaust device operates frequently to maintain bladder pressure, then the pressure control responsiveness is improved, but the durability of the device deteriorates
Solution Approach 1:
The system dynamically adjusts the detection and correction frequency based on vehicle operational conditions. During driving, when the vehicle is moving, the detection interval is extended, reducing the frequency of air pump operations and thereby improving durability. When the vehicle is stopped, the system switches to a shorter detection interval to ensure rapid pressure correction and maintain responsiveness. This dynamic strategy balances responsiveness with device longevity.
4Reliability
If the detection interval is extended to reduce operation frequency, then the durability is improved, but the ability to respond to temperature changes and maintain pressure accuracy deteriorates
Solution Approach 1:
The detection interval is dynamically adjusted based on vehicle operational state rather than using a fixed extended interval. When the vehicle is moving, the longer detection interval reduces operations and improves durability. When the vehicle is stopped, the system automatically switches to a shorter detection interval to maintain accurate pressure control in response to temperature changes. This dynamic approach ensures both durability improvement and pressure accuracy are achieved at different times as needed.
Data Source
AI summary
A pneumatic pressure control method for a vehicle seat includes: repeatedly detecting an internal pressure of a bladder provided inside the vehicle seat at intervals; correcting the internal pressure of the bladder based on a differential pressure between a detection value and a target value; and lengthening a detection interval to detect the internal pressure depending on a time elapsing from starting of the vehicle.