Two-Wheeled Vehicle Speed Measurement from Single Magnetic Pulse Timing
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Solution Overview
Problem
Existing speed measurement methods for two-wheeled vehicles, such as bicycles and motorcycles, are inaccurate for slow rotational movements and susceptible to manipulation, requiring multiple pulse registrations and additional components.
Innovation Solution
A method using a magnet and magnetic field sensor to determine speed by measuring the time between minimum and maximum magnetic field values, calculating speed using a fixed value P or R, which is independent of the vehicle's speed, allowing for faster and more accurate speed determination without additional components.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If magnetic wheel speed sensors are used to detect rotation by registering multiple pulses, then speed measurement is achieved, but measurement is inaccurate for very slow rotational movements and susceptible to manipulation
Solution Approach 1:
The patent applies preliminary action by determining the time between the minimum and maximum of a single magnetic pulse before the wheel completes a full rotation. This early determination allows speed calculation to occur before the measurement cycle finishes, enabling faster and more reliable speed detection that is less susceptible to manipulation and accurate even at very slow rotational speeds.
2Productivity
If at least two pulses must be registered for speed measurement, then speed can be determined, but the time required increases and measurement accuracy for slow movements deteriorates
Solution Approach 1:
The patent applies partial action by using only a portion of the magnetic pulse cycle (the time between minimum and maximum of a single pulse) rather than requiring complete rotation or multiple pulses. This partial measurement approach enables faster speed determination while maintaining accuracy, as the critical speed information is extracted from a single pulse's characteristic time interval.
3Ease of manufacture
If conventional speed measurement methods are used, then speed can be determined, but additional components or complex verification procedures are required
Solution Approach 1:
The patent applies self-service by using the existing magnetic field sensor and magnet system to derive speed information from the time interval between minimum and maximum of a single pulse. The system serves itself by extracting multiple pieces of information (speed, rotation state) from the same magnetic pulse signal without requiring additional sensors or components, thereby simplifying the device and reducing implementation cost.
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
Enables quick, economical, and accurate speed measurement by calculating speed before a complete wheel rotation, with plausibility checks ensuring accuracy and compatibility with existing vehicles.
Implementation Method 1
a magnetic field sensor for determining a magnetic field of the magnet
Data Source
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AI summary
The invention relates to a method for determining a speed (vP) of a two-wheeled vehicle (14) by means of a two-wheeled vehicle speed measuring device (10), comprising a magnet (22) mounted on the wheel (18), a magnetic field sensor (30) for determining a magnetic field (B) of the magnet (22), and a computer unit (34). The method comprises the steps of determining (APv) the magnetic field (B) of a magnetic pulse (42), determining (BPv) a time (Δt12, Δt34) between a minimum and a maximum of a single magnetic pulse (42), and calculating (CPv) the speed (vP) from a quotient of a determined value P stored in the two-wheeled vehicle speed measuring device (10) and the time (Δt12, Δt34) between the minimum and maximum.The determination of the value P comprises the steps of determining (AP) the magnetic field (B) for at least two magnetic pulses (42), determining (BP) the time (Δt12, Δt34) between a minimum and a maximum of a single magnetic pulse (42), determining (CP) the wheel revolution time (Δt24) between equal values of two consecutive magnetic pulses (42), determining (DP) the speed (v) from the wheel revolution time (Δt24) and a wheel circumference (U), calculating (EP) a value for P from a product of time (Δt12, Δt34) between minimum and maximum and the speed (v), and storing (FP) the value P.