Magnetic Speed Sensor Output Protocol to Prevent Channel Saturation
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Solution Overview
Problem
Conventional speed sensors provide output signals that depend on target speed, leading to loss of resolution and hardware saturation at higher speeds, limiting data throughput and requiring increased hardware for data interpretation.
Innovation Solution
A time-derived sensor output protocol that generates data at a fixed time interval independent of target speed, using magnetic field sensing elements and detection circuitry to convey target parameters such as angle of rotation and diagnostics, employing protocols like Single-Edge Nibble Transmission (SENT) for data transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If conventional speed sensors provide output signals that depend on target speed, then the sensor can communicate speed information, but the output channel becomes saturated and resolution is lost at higher speeds
Solution Approach 1:
The patent applies periodic action by transmitting sensor data at fixed time intervals (periodic sampling) rather than at variable rates dependent on target speed. This creates a regular communication rhythm that prevents channel saturation while maintaining consistent data resolution across all speed ranges, directly resolving the contradiction between sensing speed and measurement precision.
Solution Approach 2:
The patent implements dynamics by making the data transmission rate independent of the physical quantity being measured (target speed). The communication system dynamically adapts by using fixed-time-interval transmissions regardless of how fast the target is moving, allowing the sensor to accurately represent high-speed motion without proportionally increasing the communication rate, thus preventing saturation while maintaining precision.
2Measurement precision
If conventional speed sensors increase data transmission rate to maintain resolution at higher speeds, then measurement precision is maintained, but the output communication channel becomes saturated
Solution Approach 1:
The patent uses periodic action to transmit data at uniform time intervals, ensuring that the communication channel handles a consistent, manageable data throughput while maintaining full measurement precision. This periodic transmission strategy prevents channel saturation by avoiding the exponential increase in data rate that would otherwise be needed to maintain resolution at high speeds.
Solution Approach 2:
The patent changes the fundamental parameter of data transmission from speed-dependent variable rate to fixed time-interval rate. This parameter change decouples data throughput from target speed, allowing the system to maintain constant, manageable throughput levels while preserving measurement precision across the entire speed range.
3Device complexity
If conventional speed sensors use speed-derived output data, then the output protocol is simple, but hardware requirements increase at the control unit for interpreting the formatted sensor output data
Solution Approach 1:
The patent applies periodic action by structuring data transmissions to occur at fixed time intervals, creating a predictable and regular data stream that simplifies the control unit's interpretation process. This periodic structure allows the control unit to efficiently process data without needing complex synchronization or variable-rate handling logic, thereby reducing hardware requirements while maintaining protocol simplicity.
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
Enhances sensing speeds without channel saturation, increases data throughput, and reduces hardware requirements for interpreting sensor output data, improving accuracy and efficiency.
Implementation Method 1
one or more of magnetic field sensing elements operable to generate one or more magnetic field signals indicative of a magnetic field associated with the target
Data Source
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AI summary
According to one aspect of the disclosure, a sensor for detecting speed of a target includes: one or more of magnetic field sensing elements operable to generate one or more magnetic field signals indicative of a magnetic field associated with the target having a speed; detection circuitry configured to detect one or more parameters of the target using the magnetic field signals or representations thereof; and an output circuit configured to generate a sensor output signal conveying information about the one or more parameters of the target at a fixed time interval independent of the target speed.