Pressure Sensor Offset Compensation via Controller Wake-Up
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Solution Overview
Problem
Pressure sensors in vehicles degrade over time due to harsh environments, leading to offset values that reduce safety and accuracy in controlling vehicle systems, especially at low pressures, making them unreliable for various temperature ranges.
Innovation Solution
A system and method that automatically determines and stores the offset of a pressure sensor by turning on a controller after a preset time has elapsed, allowing the internal pressure to equilibrate with atmospheric pressure, using a power management module and memory to compensate for the offset when the system is turned on, thereby maintaining system safety and accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the pressure sensor is used in a severe environment (extreme weather, heat, cold, humidity), then the sensor can operate in various temperature ranges, but the degradation of the sensor increases and the lifespan decreases
Solution Approach 1:
The system performs preliminary offset compensation by automatically turning on the controller after a preset time to allow internal pressure to equilibrate with atmospheric pressure. This preliminary measurement and compensation action is taken before normal operation begins, preventing degradation effects from accumulating during actual use.
Solution Approach 2:
The pressure sensor system performs self-diagnosis and self-compensation by automatically detecting its own offset through the wake-up mode. The controller automatically turns on, measures the atmospheric pressure through the pressure sensor, calculates the offset, and stores it without requiring external intervention, thereby maintaining reliability in severe environments.
2Measurement precision
If the controller is automatically turned on after a preset time to allow pressure equilibration, then accurate offset determination is achieved, but energy consumption increases
Solution Approach 1:
The controller operates in a periodic wake-up mode where it automatically turns on only for a preset time period after system shutdown to perform offset measurement, then turns off. This periodic operation allows accurate offset determination while minimizing energy consumption compared to continuous operation.
Solution Approach 2:
The system rushes through the controller activation process by limiting it to only the necessary preset time duration required for pressure equilibration and offset measurement. The controller is activated just long enough to complete the compensation task and then immediately shut down, skipping any unnecessary prolonged operation that would waste energy.
3Speed
If the pressure sensor output value is used directly for device control, then the system responds quickly, but the offset causes inaccurate control and reduced safety
Solution Approach 1:
The system performs preliminary offset compensation by automatically turning on the controller after a preset time to allow internal pressure to equilibrate with atmospheric pressure. This preliminary measurement and compensation action is taken before normal operation begins, preventing degradation effects from accumulating during actual use.
Solution Approach 2:
The system implements feedback by measuring the actual offset through the wake-up mode, storing this offset value in memory, and then using this feedback information to compensate the pressure sensor output during normal operation. This closed-loop feedback ensures accurate control while maintaining quick response.
Data Source
AI summary
A system and method are provided for compensating an offset of a pressure sensor. The system includes a pressure sensor that is configured to detect pressure and a power management module that is configured to automatically supply power to a controller connected to the power management module or terminate the supply of power after a preset time to thereby turn the controller on or off. The system further includes the controller connected to the power management module and configured to determine the offset of the pressure sensor based on a pressure value which is detected by the pressure sensor when the power is supplied from the power management module. The system also includes a memory configured to store the determined offset.