Position Transducer Computation Model for Sensorless Parameter Estimation
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Solution Overview
Problem
Position transducer systems without current sensors face inaccuracies due to conservative design requirements, leading to performance, space, and cost disadvantages, as existing estimation models have large tolerances and are not always feasible.
Innovation Solution
A method and device that determine physical variables in position transducer systems by creating a computation model mapping system behavior, using system variables to estimate parameters, which are then used to calculate physical variables, particularly in nonlinear systems without the need for a current sensor, allowing for real-time parameter determination.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a current sensor is provided to accurately determine physical variables, then measurement precision is improved, but device complexity and cost increase
Solution Approach 1:
The patent uses a computation model as an intermediary to indirectly determine physical variables. Instead of directly measuring current with a sensor, the system uses a computation model that maps system behavior, taking easily measurable system variables (like position and trigger voltage) as input and computing the desired physical variables (current, temperature, ohmic resistance) through parameter determination. This intermediary approach avoids the need for complex direct sensing while maintaining accuracy.
Solution Approach 2:
The patent replaces the physical measurement system (current sensor) with a computational system. The computation model uses mathematical relationships and parameter determination algorithms to substitute for the physical sensor, transforming a hardware-based measurement approach into a software-based computational approach that achieves the same measurement objective without additional hardware complexity.
2Measurement precision
If a current sensor is provided to accurately determine physical variables, then measurement precision is improved, but installation space and cost increase
Solution Approach 1:
The computation model serves multiple functions simultaneously: it determines current, temperature, and ohmic resistance from the same set of system variables and parameters. This multi-functionality eliminates the need for separate sensors for each physical variable, reducing both installation space and cost while maintaining measurement precision for all parameters through a unified computational approach.
3Reliability
If conservative design is used in systems without current sensors to compensate for estimation inaccuracies, then reliability is improved, but performance and installation space deteriorate
Solution Approach 1:
The patent dynamically determines parameters of the computation model from system variables measured at different points in time. This parameter adaptation allows the system to accurately track changing operating conditions without requiring conservative design margins. The parameters are updated in real-time based on actual system behavior, enabling high-performance operation while maintaining reliability through accurate, adaptive estimation rather than conservative fixed designs.
Data Source
AI summary
A method for ascertaining a value of a physical variable in a position transducer system includes the steps of providing a computation model, which maps a response of the position transducer system, wherein the computation model includes a model function and one or multiple parameter(s); ascertaining a value of at least one system variable at one or multiple points in time; determining the parameters of the computation model from one or multiple value(s) of the at least one system variable determined at different points in time; and determining the value of the physical variable as a function of the one or the multiple determined parameters.