Vehicle Charging Current Sensing for Precise Dual-Mode Measurement
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Solution Overview
Problem
Existing vehicles face challenges in precise power measurement during normal charge and discharge due to the need for wide-range current sensors, which incur significant cost increases when supporting both rapid and normal charge and discharge capabilities.
Innovation Solution
The vehicle is configured with separate power lines and current sensors for rapid and normal charge and discharge, using a dedicated path and sensor for normal operations to avoid interference from electrical loads, allowing precise power measurement without increasing costs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a current sensor that can measure current over a wide range is adopted to measure currents for both rapid charge and normal charge and discharge, then the vehicle can support both charging modes, but the cost increases significantly
Solution Approach 1:
The patent divides the charging system into two separate measurement paths: one for rapid charge current measurement and another for normal charge/discharge current measurement. Each path uses a current sensor optimized for its specific current range, avoiding the need for a single expensive wide-range sensor. This segmentation allows the system to support both charging modes while using cost-effective, specialized sensors for each function.
2Measurement precision
If power measurement is performed during normal charge and discharge using the existing current sensor in the positive electrode line, then the system can measure power, but the precision is reduced due to the small power being consumed by auxiliary devices
Solution Approach 1:
The patent extracts the normal charge/discharge current measurement function from the main positive electrode line by providing a separate measurement path through the third power line and second current sensor. This dedicated measurement path isolates the low-power normal charging measurements from the high-power rapid charging measurements, enabling precise measurement of small currents without interference from auxiliary device power consumption or the need to use a wide-range sensor.
3Device complexity
If a single power line is used for both rapid charge and normal charge and discharge, then the system structure is simplified, but the current sensor must cover a wide range which increases cost
Solution Approach 1:
The patent segments the power transmission paths by providing separate power lines for rapid charge (second power line) and normal charge/discharge (third power line). This segmentation allows each current sensor to be optimized for its specific current range, reducing overall system cost while maintaining structural organization through dedicated pathways for each charging mode.
Data Source
AI summary
A vehicle that supports rapid charge and normal charge and discharge includes an electrical load, a first power line, a second power line, a third power line, a first relay, a second relay, a first current sensor, a second current sensor, and an electronic control unit. The electronic control unit of the vehicle is configured to measure a current using a detection value from the second current sensor with the first relay controlled to an open state and with the second relay controlled to a closed state when the normal charge and discharge is executed. The electronic control unit is configured to measure a current using a detection value from the first current sensor with the first relay controlled to a closed state and with the second relay controlled to an open state when the rapid charge is executed.