Pulse-Based Position Detection for Drive Apparatuses
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Solution Overview
Problem
Existing position detection systems for vehicles or movable elements in drive apparatuses are slow due to continuous measurement signals that require processing over multiple periods, leading to delayed position determination.
Innovation Solution
A method and apparatus using an excitation coil and secondary coil with a pulse generator to apply an electrical excitation pulse, inducing a voltage in the secondary coil, which is measured to determine the position of the movable element, allowing for faster detection by eliminating the need for prolonged signal processing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a continuous periodic voltage signal is applied to the sensor coil for position detection, then measurement signal availability is improved, but position determination time increases considerably
Solution Approach 1:
The patent applies periodic pulsed excitation signals to the sensor coil instead of continuous signals. The evaluation unit processes the coil voltage signals during specific evaluation intervals that are synchronized with the pulse frequency, enabling position determination within a fraction of the measurement period rather than requiring multiple complete cycles.
Solution Approach 2:
The system performs preliminary action by pre-synchronizing the evaluation intervals with the excitation pulse frequency. The evaluation unit is prepared to process signals at predetermined time points before the actual position query is made, allowing rapid position determination without requiring prolonged signal processing.
2Reliability
If continuous measurement signals are used for position detection, then signal availability is improved, but processing time over multiple periods increases
Solution Approach 1:
The system uses periodic pulsed excitation with synchronized evaluation intervals, converting continuous signal processing into discrete periodic measurements. This maintains reliable signal availability at predetermined moments while dramatically reducing the time required for position determination.
Solution Approach 2:
The evaluation unit processes only the necessary portion of the measurement signal during specific evaluation intervals rather than analyzing complete multiple-period waveforms. This partial action approach provides sufficient information for accurate position determination without the overhead of processing entire signal cycles.
3Measurement precision
If envelope measurement over multiple periods is performed, then position determination accuracy is improved, but measurement time increases considerably
Solution Approach 1:
The evaluation unit performs preliminary processing of coil voltage signals during synchronized evaluation intervals before position queries are made. This preliminary action prepares the data in advance, enabling rapid position determination with accurate envelope measurement without requiring prolonged measurement durations.
Solution Approach 2:
The system uses periodic evaluation intervals synchronized with pulse excitation to perform envelope measurements. By concentrating measurement efforts into specific periodic windows rather than continuous monitoring, the system achieves accurate position determination in much shorter time frames.
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 rapid position detection of movable elements, reducing measurement time significantly compared to traditional methods, with the ability to determine position in a shorter duration and allowing for precise and sensitive position tracking.
Implementation Method 1
An electrical excitation pulse is applied to the excitation coil, such that an electrical voltage is thereby induced in the secondary coil
Data Source
AI summary
A method for detecting a position of a movable element of a drive apparatus by means of a position detection apparatus comprising at least one field coil and at least one secondary coil associated with the field coil, wherein an electrical excitation pulse is applied to the field coil in order to induce an electrical voltage in the secondary coil, a secondary coil voltage is measured and the position of the movable element is determined on the basis of the measured secondary coil voltage. The invention also relates to a position detection apparatus and/or a drive apparatus.