Inductive Throttle Position Sensing Without Wear or Magnetic Interference
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Solution Overview
Problem
Existing throttle position detection methods, such as potentiometers and magnetic sensors, face issues like wear, failure due to stray magnetic fields, and interference from foreign objects, making them less reliable for electronic throttle controls in motorcycles.
Innovation Solution
The implementation of inductive position sensors, which include a plurality of circuit boards with transmission and sensor coils, and conductive targets mounted on a shaft, allowing for contactless and magnetic-field-insensitive position detection by monitoring the signals induced in the sensor coils as the shaft rotates.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If contacting solutions (potentiometers) are used for throttle position detection, then the position can be detected, but wear occurs leading to reduced reliability
Solution Approach 1:
The patent replaces the mechanical contacting solution (potentiometer with physical contact) with an inductive sensing system using transmission coils, sensor coils, and conductive targets. This eliminates mechanical wear while maintaining position detection capability, directly resolving the contradiction between reliability and service life.
2Reliability
If magnetic sensor solutions (hall effect, xMR) are used for throttle position detection, then the position can be detected, but stray magnetic fields cause interference and failure
Solution Approach 1:
The patent replaces magnetic sensor solutions with an inductive sensing system that uses electromagnetic induction between transmission coils, sensor coils, and conductive targets. This alternative physical principle eliminates sensitivity to stray magnetic fields while maintaining position detection reliability.
3Reliability
If inductive position sensors with multiple circuit boards are used, then reliability and resistance to magnetic interference are improved, but device complexity increases
Solution Approach 1:
The patent divides the sensing system into multiple circuit boards, each with transmission coils, sensor coils, and control circuitry. This segmentation allows for modular design that improves reliability through redundancy while organizing complexity into manageable, independent units that can be manufactured and tested separately.
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 solution provides a reliable and durable method for detecting throttle position, avoiding wear and interference from stray magnetic fields, ensuring accurate and safe throttle control operation.
Implementation Method 1
inductive position sensors, which include a plurality of circuit boards with transmission and sensor coils, and conductive targets mounted on a shaft, allowing for contactless and magnetic-field-insensitive position detection by monitoring the signals induced in the sensor coils as the shaft rotates
Data Source
AI summary
A control that can be a throttle control of a handle-bared vehicle is presented. According to some embodiments, a control can include a plurality of circuit boards, each of the circuit boards including a transmission coil, sensor coils, and control circuitry the drives the transmission coil and receives signals from the sensor coils; and one or more targets mounted on a shaft and configured to rotate over the sensor coils of the plurality of circuit boards as the shaft is rotated, wherein the plurality of circuit boards are mounted around the shaft, and wherein the position of the target is determined by the control circuitry as the shaft is rotated.