Battery Pack Power Limit Conversion for Vehicle Charge Control
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Solution Overview
Problem
Existing vehicle control systems face challenges in implementing power-based input restriction using a current restricting battery pack, as there is a lack of studies on combining current restricting battery packs with power restricting control devices, making it difficult to adopt current restricting battery packs in vehicles equipped with power restricting control devices.
Innovation Solution
A vehicle control system that includes a battery pack with a first control device obtaining a current upper limit value and a second control device using a converter to convert this value into a power upper limit value by multiplying the current upper limit value with an estimated voltage value, allowing for accurate power-based input restriction even when a current restricting battery pack is used.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If power-based input restriction is implemented using a current restricting battery pack, then the input power control accuracy is improved, but the system complexity increases
Solution Approach 1:
The conversion unit serves as a simple intermediary that performs a straightforward mathematical calculation (power = current × voltage) to convert the current upper limit value. This minimal addition achieves accurate power-based control without significantly increasing system complexity, as the conversion logic can be implemented through simple computation rather than additional hardware.
Data Source
AI summary
A vehicle includes: a battery pack including a secondary battery, a battery sensor that detects a state of the secondary battery, and a first control device; a second control device provided separately from the battery pack; and a converter. The first control device is configured to use a detection value of the battery sensor to obtain a current upper limit value indicating an upper limit value of an input current of the secondary battery. The second control device is configured to use a power upper limit value indicating an upper limit value of an input power of the secondary battery to control the input power of the secondary battery. The converter is configured to perform a conversion of the current upper limit value into the power upper limit value.