Digital Sensor Signal Shifting to Prevent Range Saturation
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Solution Overview
Problem
Digital sensors can saturate due to unforeseen external disturbances, causing the measured physical quantity to exceed the sensor's measurement range, leading to inaccurate readings.
Innovation Solution
A system with first and second shift means, controlled by a microcontroller, continuously adjusts the analog and digital signals to keep the measurement within the sensor's range, using a control module to apply shifts and gains as needed to prevent saturation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the sensor operates with fixed gain and shift parameters, then the device complexity is low, but the measurement precision deteriorates when external disturbances cause the physical quantity to exceed the measurement range
Solution Approach 1:
The patent applies dynamics by making the gain and shift parameters variable rather than fixed. The control module dynamically adjusts these parameters based on the measured physical quantity to keep the operating point within the optimal measurement range, even when external disturbances occur. This resolves the contradiction by allowing the system to adapt to changing conditions while maintaining measurement precision.
Solution Approach 2:
The patent implements feedback through a control module that continuously monitors the measured physical quantity and adjusts the gain and shift parameters accordingly. The feedback loop ensures that the sensor operating point remains within the optimal range by comparing the actual measurement with the desired range and applying corrective adjustments, thereby maintaining precision without requiring overly complex hardware.
2Adaptability or versatility
If the sensor operates with fixed gain and shift parameters, then the device complexity is low, but the adaptability deteriorates when external disturbances occur
Solution Approach 1:
The patent makes the sensor system dynamic by enabling real-time adjustment of gain and shift parameters through a control module. This allows the sensor to adapt to external disturbances such as temperature changes or magnetic field variations without requiring multiple fixed-configuration sensors, thereby improving adaptability while keeping device complexity manageable.
Solution Approach 2:
The patent changes the operational parameters (gain and shift) of the sensor dynamically based on environmental conditions and measured values. By adjusting these parameters in response to external disturbances, the system achieves high adaptability to different operating conditions without adding significant hardware complexity.
3Measurement precision
If the sensor operates without continuous control adjustment, then the use of energy is low, but the measurement precision deteriorates under abrupt changes caused by external disturbances
Solution Approach 1:
The patent implements periodic action by having the control module adjust gain and shift parameters at specific intervals or when triggered by detected changes in the measured quantity. This approach maintains measurement precision under abrupt changes while avoiding continuous energy-consuming adjustments, thereby balancing precision with energy efficiency.
Solution Approach 2:
The sensor system performs self-service by automatically detecting when external disturbances affect measurements and autonomously adjusting its own gain and shift parameters through the control module. This self-adjusting capability maintains precision without requiring external intervention or continuous energy input for manual recalibration.
Data Source
AI summary
A system for controlling a digital sensor (CN) for measuring a physical quantity (GP) includes a transducer (TRD) delivering as output an analog signal representative of the physical quantity (GP), with means (MGD) for implementing gain and/or shift on the analog output signal (SA1) of the transducer (TRD), and with an analog-digital converter (CAN) at the output of the sensor (CN) so as to deliver a digital signal (SN1). A first means (MA1) applies a first shift to the analog signal of the physical quantity (GP), and a second means (MA2) applies a second shift to the digital signal (SN1). Control means (CMD) continuously controls the first application means (MA1), on the basis of the digital signal (SN1), as well as the second application means (MA2), on the basis of the digital signal (SN1) and/or of the first shift.