Multiturn Angle Detection with Single-Sensor Pulse Compensation
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Solution Overview
Problem
Existing multiturn angle detection devices using power generation sensors are large and costly due to the need for multiple sensors and complex signal processing to determine rotation direction and correct for pulse missing, which complicates precise angle detection.
Innovation Solution
A multiturn angle detection device utilizing a single power generation sensor with a magnetic field generation source and a sensor element, combined with a precision absolute angle detector, determines rotation direction and compensates for pulse missing through a novel algorithm that updates count values based on voltage pulse polarity and sensor element state, stored in a nonvolatile memory, allowing precise multiturn angle detection without external power.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If multiple power generation sensors are used to determine rotation direction and correct for pulse missing, then measurement precision is improved, but device complexity and cost increase
Solution Approach 1:
The patent employs a self-service principle where the system uses its own output signals (voltage pulses from the power generation sensor) to determine rotation direction and detect pulse missing conditions. The arithmetic device analyzes the sequence and polarity of generated pulses to autonomously correct counting errors without requiring external reference signals or additional sensors, thereby maintaining high measurement precision while reducing device complexity
Solution Approach 2:
The patent implements a feedback mechanism where the arithmetic device continuously monitors the voltage pulse signals from the power generation sensor, detects pulse missing conditions by comparing expected vs. actual pulse sequences, and applies corrective algorithms to the count values. This closed-loop feedback approach ensures precise angle detection by dynamically compensating for pulse losses while using only a single sensor
2Measurement precision
If multiple power generation sensors are used to determine rotation direction and correct for pulse missing, then measurement precision is improved, but manufacturing cost increases
Solution Approach 1:
The system uses the single power generation sensor's own output signals to perform self-diagnosis and self-correction of pulse missing conditions. The arithmetic device analyzes pulse polarity sequences and applies correction algorithms autonomously, eliminating the need for multiple expensive sensors while maintaining high measurement precision through intelligent signal processing
Solution Approach 2:
The patent replaces the mechanical approach of using multiple physical sensors with an intelligent software-based correction system. The arithmetic device uses algorithms to detect and correct pulse missing conditions through mathematical processing of the single sensor's output, substituting complex hardware with computationally efficient signal processing to reduce manufacturing costs while maintaining precision
3Device complexity
If a single power generation sensor is used, then device complexity is reduced, but pulse missing occurs leading to measurement errors
Solution Approach 1:
The patent implements a feedback mechanism where the arithmetic device continuously monitors the voltage pulse signals from the power generation sensor, detects pulse missing conditions by comparing expected vs. actual pulse sequences, and applies corrective algorithms to the count values. This closed-loop feedback approach ensures precise angle detection by dynamically compensating for pulse losses while using only a single sensor
Solution Approach 2:
The patent replaces the mechanical approach of using multiple physical sensors with an intelligent software-based correction system. The arithmetic device uses algorithms to detect and correct pulse missing conditions through mathematical processing of the single sensor's output, substituting complex hardware with computationally efficient signal processing to maintain precision while reducing device complexity
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 enables size reduction and cost savings by using a single power generation sensor with a novel counting algorithm, ensuring precise multiturn angle detection by combining count values with absolute angle detection without complex signal processing or size-increasing multiple sensors.
Implementation Method 1
Magnetic wires having a large Barkhausen effect (large Barkhausen jump) are known in the name of Wiegand wire or pulse wire... When the hard layer and the soft layer are magnetized in the same direction axially of the wire and the strength of an external magnetic field applied in a direction opposite to that magnetization direction is increased to a certain magnetic field strength, the magnetization direction of the soft layer is reversed. The reversal of the magnetization direction starts at a certain position of the magnetic wire to propagate to the entire wire, whereby the magnetization direction of the soft layer is totally reversed. At this time, the large Barkhausen effect is exhibited to induce a pulse signal in the coil wound around the magnetic wire.
Data Source
AI summary
A multiturn angle detection device includes: a segment counter to count segments in an angular range over the single turn of a rotation shaft; a precision absolute angle detector to generate an absolute angle detection value within the single-turn cycle; and an arithmetic device to generate a multiturn absolute angle detection value by combining the output of the segment counter with the output of the precision absolute angle detector. The segment counter includes: a single power generation sensor; a magnetic field generation source; a sensor element; and a nonvolatile memory to store a count value. The magnetic field generation source applies a two or more-cycle alternating magnetic field per each turn of the rotation shaft axially of a magnetic wire. The arithmetic device uses the count value stored in the nonvolatile memory as it is when receiving external electric power supply.