Dual-Path Vehicle Current Sensor With Mutual Circuit Correction
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Solution Overview
Problem
Current sensors for vehicle batteries, particularly in electric and hybrid vehicles, require redundant current measurement to ensure high accuracy and reliability, but existing solutions are costly and complex.
Innovation Solution
A current sensor with two independent current measurement devices using different principles, each connected to separate evaluation circuits that monitor and correct each other, and a communications link for mutual checking and correction, along with a compact design using a Hall effect sensor without an iron core and separate power supplies to enhance reliability and simplicity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If two independent current measurement devices with different measurement principles are used for redundant current measurement, then measurement accuracy and reliability are improved, but production cost and device complexity increase
Solution Approach 1:
The evaluation function is segmented into two separate evaluation circuits, each independently evaluating measurement values from current measurement devices. This segmentation allows each circuit to be simpler while maintaining overall system reliability through mutual monitoring and correction capabilities.
Solution Approach 2:
A feedback mechanism is implemented where the first evaluation circuit sends test signals to the second evaluation circuit and vice versa. Each circuit can detect deviations in the other's test signals and send correction signals back, creating a closed-loop feedback system that maintains accuracy without requiring overly complex individual circuits.
2Measurement precision
If two independent current measurement devices with different measurement principles are used for redundant current measurement, then measurement accuracy and reliability are improved, but production cost increases
Solution Approach 1:
The evaluation functionality is divided into two separate but simpler evaluation circuits rather than one complex evaluation circuit. This segmentation reduces the complexity and cost of each individual circuit while maintaining the required measurement precision through their coordinated operation and mutual correction.
Solution Approach 2:
The patent implements a form of copying where each evaluation circuit replicates the essential evaluation functionality and can verify the other's work through test signals. This allows for cost-effective production by using simpler, more standardized circuit designs that can be manufactured efficiently while still achieving high measurement accuracy through mutual verification.
3Reliability
If evaluation circuits are designed to monitor and correct each other through mutual checking, then reliability is improved, but device complexity increases
Solution Approach 1:
The mutual monitoring and correction between evaluation circuits is achieved through a feedback mechanism where test signals are exchanged and deviations are detected. Each circuit sends test signals to the other and can send correction signals back when deviations are detected, creating a self-correcting feedback loop that improves reliability without requiring excessively complex circuit designs.
Solution Approach 2:
The evaluation circuits are designed to self-monitor and self-correct through their mutual interaction. Each circuit can detect errors in the other's test signals and autonomously send correction signals, enabling the system to self-regulate and maintain reliability without external intervention or overly complex control mechanisms.
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
The solution provides high measurement accuracy, reliability, and cost-effective production by enabling mutual checking and correction of evaluation circuits, while simplifying the sensor structure and reducing the need for additional protection against voltage flashover.
Implementation Method 1
a first current measurement device (24) having a Hall effect sensor (26)
Data Source
AI summary
A current sensor with an electrical conductor which has a first connection and a second connection for contacting a power circuit of a vehicle, and with a first and a second current measurement device for detecting at least one measurement value for the current flowing over the electrical conductor, and with a first evaluation circuit which is connected to the first and/or the second current measurement device and can receive the measurement values of the first and/or the second current measurement device and output a current measurement signal depending on the measurement values, and with a second evaluation circuit.