Physical Quantity Sensor Temperature Compensation Circuit
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Solution Overview
Problem
Conventional physical quantity sensors for attitude control in movable bodies, such as airplanes and vehicles, face challenges due to their large size and complex component count, which can lead to temperature-induced signal fluctuations, affecting accuracy.
Innovation Solution
A compact physical quantity sensor design incorporating a detection circuit and correction processor that uses a ΣΔ modulator to convert Coriolis force-generated electric charges into digital signals, and a correction processor to maintain a zero output by adjusting for temperature changes and noise, ensuring stability and accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If temperature control components (temperature sensor and Peltier element) are added to prevent temperature-induced signal changes, then temperature stability is improved, but device complexity and size increase
Solution Approach 1:
The patent replaces the mechanical/thermal control system (temperature sensor + Peltier element) with an electronic signal processing system. The correction processor electronically compensates for temperature-induced errors by processing the output signal, eliminating the need for physical temperature control components while maintaining temperature stability.
Solution Approach 2:
The correction processor acts as an intermediary between the detection circuit and the output. It receives the raw detection signal, applies correction algorithms to compensate for temperature effects, and outputs the corrected signal, thereby eliminating temperature-induced changes without direct thermal control.
2Reliability
If multiple components are used for temperature control, then temperature stability is improved, but the sensor size increases
Solution Approach 1:
The patent substitutes physical thermal management components with an electronic correction system. By using signal processing to compensate for temperature effects rather than physically controlling temperature, the sensor maintains compact dimensions while achieving temperature stability.
3Reliability
If conventional temperature control mechanisms are used, then output signal stability is improved, but the number of components increases
Solution Approach 1:
The patent extracts the temperature compensation function from the physical hardware domain and implements it in the signal processing domain. The correction processor isolates and removes temperature-induced error components from the detection signal, achieving output stability without adding physical control components.
Solution Approach 2:
The patent replaces the mechanical/thermal control approach with electronic signal processing. The correction processor uses mathematical operations on the detection signal to compensate for temperature effects, substituting physical temperature control mechanisms with computational methods.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The solution effectively prevents signal changes due to temperature fluctuations while maintaining a small component count, enhancing the accuracy and reliability of attitude control systems.
Implementation Method 1
Vibrator 1 is rotated at an angular velocity ω about a Z-axis while vibrator 1 vibrates, and then, a Coriolis force is produced on vibrator 1. An electric charge generated on vibrator 1 due to the Coriolis force is converted into an output voltage to detect the angular velocity.
Data Source
AI summary
A physical quantity sensor includes a detection circuit that outputs a detection value indicating a physical quantity applied to a detecting element and a correction processor that corrects the detection value to output a corrected value. The correction processor causes the corrected value to be substantially 0 (zero) if all of conditions that an absolute value of a time-differentiated value of the detection value is not larger than a predetermined differential threshold and that an absolute value of the corrected value is not larger than a predetermined output threshold are satisfied. This physical quantity sensor prevents the output signal from changing due a temperature change in spite of a small number of components.