Sensor Control Device Quantization Error Compensation
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Solution Overview
Problem
Existing sensor systems face precision issues due to quantization errors at operating or resonance frequencies, leading to imprecise control and reduced sensor accuracy, particularly in rotation rate sensors that require oscillations at non-zero frequencies.
Innovation Solution
A device and method for controlling sensors that include a converter unit, comparison unit, and control unit to generate a transfer function with a zero point at the sensor's operating frequency, minimizing quantization errors by processing the difference signal and feeding it back to the input signal, thereby ensuring precise control without errors at non-zero frequencies.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Extent of automation
If digital/analog converters are used to convert calculated reset force into analog signals, then the control system can operate with digital processing capabilities, but quantization errors are introduced that affect sensor precision at operating frequencies
Solution Approach 1:
The patent implements a feedback mechanism where the quantization error is detected by comparing the digital input signal with the analog output signal, and this detected error is then fed back to the digital/analog converter to compensate for the quantization effect. This closed-loop feedback system eliminates the harmful quantization errors while preserving the benefits of digital processing.
Solution Approach 2:
The patent converts the harmful quantization error into a useful signal by detecting it through comparison and then using it as a correction term in the feedback loop. The previously harmful quantization effect is transformed into a beneficial compensation signal that improves overall system precision.
2Speed
If the sensing head is actively reset using oscillation at operating frequency, then the sensing head returns quickly to reset position, but quantization errors occur at the operating frequency reducing control precision
Solution Approach 1:
The patent uses feedback to detect and compensate for quantization errors that occur during active reset operations. The feedback loop continuously monitors the difference between desired and actual control signals and corrects quantization errors in real-time, maintaining both fast reset speed and high control precision.
Solution Approach 2:
The system performs preliminary detection of quantization errors through signal comparison before they significantly degrade control precision. By detecting and compensating for errors in advance through the feedback mechanism, the system prevents precision loss while maintaining fast reset operations.
3Stability of the object's composition
If the sensing head oscillates with low damping after measurement, then the system returns to rest state, but measurement precision is impaired during the oscillation period
Solution Approach 1:
The feedback mechanism continuously monitors the sensing head position during oscillation and provides real-time correction signals to compensate for quantization errors. This allows the system to maintain measurement precision even while the sensing head is oscillating and returning to the rest state.
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
This approach reduces biasing of sensor control due to quantization errors near its operation or resonance frequency, ensuring precise and reliable sensor operation with improved linearity, especially for sensors like rotation rate sensors, and allows error-free control at various frequencies.
Implementation Method 1
errors are generated by converting in digital/analog converters, which converting is also called 'quantization'
Implementation Method 2
it is tried to minimize the error in the relevant frequency band by feeding back the error into the sensor system
Implementation Method 3
the force is generated via voltages at electrodes, which lead to electrostatic forces
Implementation Method 4
a deflection by the Coriolis force
Implementation Method 5
a reset force that acts against the movements of the sensing head and achieves in that manner a quick transient oscillation to the reset position
Data Source
AI summary
The invention relates to a device (300) for controlling a sensor (310), comprising a converter unit (320) for converting an input signal (365) into a control signal (360) for controlling said sensor (310), and a comparison unit (330) for determining a differential signal (370) that indicates the difference between said input signal (365) and control signal (360). The device also comprises a feedback unit (340) for regulating the input signal (365) using said differential signal (370). A differential signal (370) transfer function has a zero point at a sensor (310) operating frequency which does not equal zero.