Angular Velocity Sensor Frequency Matching Control
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Solution Overview
Problem
Conventional angular velocity sensors fall short in meeting the increasing demand for higher accuracy, particularly in applications such as vehicle steering attitude control.
Innovation Solution
An angular velocity sensor comprising an angular velocity sensor element with a monitor electrode, drive electrode, sense electrode, and weight, along with a drive circuit, detection circuit, and a reference potential supply circuit that includes CV converters, a comparator, and a reference potential adjustment circuit to enhance accuracy by matching and adjusting signal frequencies.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional mode-matching control is used to match drive frequency and detection frequency, then the sensor provides acceptable accuracy, but the accuracy is insufficient to meet increasing demand for higher precision
Solution Approach 1:
The patent implements dynamic frequency adjustment by continuously monitoring the drive frequency and automatically adjusting the detection frequency to maintain synchronization. The control circuit dynamically modifies the detection frequency based on the actual drive frequency, ensuring accurate detection even when drive frequency varies due to temperature, aging, or manufacturing tolerances.
Solution Approach 2:
The patent employs feedback control by monitoring the drive frequency and using this information to adjust the detection frequency. The control circuit receives feedback about the actual drive frequency and automatically compensates by adjusting the detection frequency, creating a closed-loop system that maintains optimal detection accuracy under varying conditions.
2Measurement precision
If the drive frequency varies due to temperature changes, aging, or manufacturing tolerances, then the sensor structure remains simple, but the detection accuracy deteriorates
Solution Approach 1:
The patent implements self-service by enabling the sensor system to automatically monitor and adjust its own detection frequency based on its actual drive frequency. The control circuit autonomously compensates for frequency variations without requiring external calibration or complex manual adjustment mechanisms, maintaining accuracy while keeping the overall system relatively simple.
Solution Approach 2:
The patent changes the detection frequency parameter dynamically to match the drive frequency. By making the detection frequency adjustable and dependent on the actual drive frequency, the system compensates for variations caused by temperature, aging, or manufacturing tolerances, maintaining detection accuracy without requiring complex structural modifications.
3Measurement precision
If higher detection accuracy is pursued through more complex frequency matching mechanisms, then measurement precision improves, but device complexity and manufacturing cost increase
Solution Approach 1:
The patent uses dynamic frequency adjustment through a control circuit that automatically adapts the detection frequency to match the drive frequency. This dynamic approach achieves high detection accuracy without requiring complex mechanical structures or multiple precision components, thereby maintaining ease of manufacture while improving measurement precision.
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 provides a highly accurate angular velocity sensor capable of effectively detecting angular velocities for precise steering attitude control of vehicles by ensuring consistent and efficient vibration frequencies.
Implementation Method 1
a drive circuit applies an electric signal to a drive electrode to drive the weight
Implementation Method 2
an electric signal generated by displacement of the weight is input to a detection circuit from a sense electrode
Implementation Method 3
when an angular velocity is input, a Coriolis force acts on the weight in a direction different from the drive direction, and thus the weight is displaced also in the detection direction
Data Source
AI summary
An angular velocity sensor includes an angular velocity sensor element, a drive circuit, a detection circuit, and a reference potential supply circuit. The angular velocity sensor element has a monitor electrode, a drive electrode, a sense electrode, and a weight. The reference potential supply circuit supplies a reference potential to the angular velocity sensor element. The reference potential supply circuit has a first CV converter, a second CV converter, a comparator, and a reference potential adjustment circuit. The first CV converter is connected to the monitor electrode. The second CV converter is connected to the sense electrode. The comparator compares a frequency of a signal being output from the first CV converter with a frequency of a signal being output from the second CV converter, and outputs a signal depending on a result of the comparison.