Physical Quantity Sensor Lead Compensation Overcorrection
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing physical quantity detecting devices in vehicles face challenges in accurately measuring heat and noise due to increased device size and costs, and are prone to overcorrection from ambient environment or EMC noise influences.
Innovation Solution
A physical quantity detecting device that includes a sensor for detecting the target fluid, a compensation amount calculation unit to determine lead compensation, and a gain control unit to adjust the compensation based on the deviation over time, thereby preventing overcorrection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If lead compensation is applied to improve response speed, then measurement responsiveness is improved, but overcorrection occurs due to ambient environment or EMC noise influences
Solution Approach 1:
The patent implements dynamic adjustment of the lead compensation amount based on the deviation between the detected physical quantity and its previous value. When deviation exceeds a threshold, the compensation amount is reduced or stopped, preventing overcorrection while maintaining responsiveness during normal operation. This dynamic control resolves the contradiction by adapting the compensation strategy to current operating conditions.
Solution Approach 2:
The patent uses feedback control by continuously monitoring the deviation in detection signals and adjusting the lead compensation amount accordingly. The system calculates the deviation amount and uses it to modulate the compensation applied to subsequent measurements, creating a closed-loop control system that prevents overcorrection while maintaining fast response when needed.
2Measurement precision
If multiple sensors are used to improve measurement accuracy, then measurement precision is improved, but device size and costs increase
Solution Approach 1:
The patent enables a single sensor to perform multiple functions by implementing lead compensation and deviation-based control within the same detection device. The system uses the detection signal itself to calculate compensation amounts and adjust its own output, eliminating the need for separate compensation sensors while maintaining high measurement accuracy through intelligent signal processing.
Data Source
AI summary
It is possible to suppress overcorrection.A physical quantity detecting device includes: a physical quantity detecting sensor that detects a physical quantity of a measurement target fluid and outputs a detection signal; a compensation amount calculation unit that calculates, by using the detection signal, a lead compensation amount used in lead compensation for the detection signal; and a gain control unit that adjusts the lead compensation amount based on a deviation that is an amount of change in lead compensation amount over time.