Power-Line Battery Pack ID Reading With Dynamic Threshold Setting
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Solution Overview
Problem
Existing systems for identifying battery packs in electric assisted bicycles face challenges in accurately receiving identification information superimposed on power lines due to potential offsets in current or voltage measurements, leading to false determinations.
Innovation Solution
An identification information receiving device that includes a measurement value obtainment unit, an identification information reading unit, and a threshold value setting unit to dynamically adjust determination thresholds based on initial values and current or voltage measurements, ensuring accurate identification by adapting to variations in system conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a fixed determination threshold value is used to read identification information from current or voltage measurements, then the reading process is simple, but false determinations occur due to component variations and current consumption changes
Solution Approach 1:
The patent applies dynamics by transitioning from a fixed threshold value to a dynamic threshold determination mechanism. The receiving device now calculates threshold values based on actual measurement data obtained during operation, allowing the threshold to adapt to component variations and changing current consumption conditions. This resolves the contradiction by making the threshold flexible rather than static, improving reliability without significantly increasing complexity.
Solution Approach 2:
The patent changes the parameter of the determination threshold from a fixed constant to a variable determined by measurement data. By using actual current or voltage measurements to establish the threshold, the system adapts to environmental and component variations. This parameter change allows the system to maintain high reading accuracy while accounting for real-world variations in component characteristics and power consumption.
2Ease of operation
If identification information is superimposed on power lines for wireless communication, then terminals for communication lines can be eliminated from connectors, but accurate reception of identification information becomes difficult due to offsets in current or voltage measurements
Solution Approach 1:
The patent changes the approach to threshold determination from fixed to dynamic based on actual measurements. By establishing thresholds through real measurement data rather than predetermined values, the system compensates for offsets in current or voltage measurements. This allows accurate identification information reception despite the simplified connector structure that eliminates dedicated communication terminals.
Solution Approach 2:
The patent implements feedback by using actual measurement values to determine thresholds for subsequent readings. The receiving device continuously obtains measurement data and uses this information to establish appropriate threshold values, creating a closed-loop system that adapts to changing conditions. This feedback mechanism ensures accurate identification information detection while maintaining the simplified power-line-only connector structure.
Data Source
AI summary
In an identification information receiving device connected to an identification information transmitting device by a power line, a measurement value obtainment unit obtains a measurement value of an electric current or a voltage in the power line. An identification information reading unit reads, as binary data, identification information defined by a plurality of bits and superimposed on the electric current or the voltage in the power line by the identification information transmitting device, by determining whether the measurement value corresponding to each bit of the identification information is greater or less than a determination threshold value (other than 0). A threshold value setting unit sets the determination threshold value on the basis of an initial threshold value (other than 0) and the measurement value corresponding to each bit of threshold value verification information defined by a plurality of bits and superimposed on the electric current or the voltage in the power line by the identification information transmitting device before the identification information.