Hybrid Vehicle Battery Control System with Real-Time Parameter Correction
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Solution Overview
Problem
Existing control systems for plug-in vehicles with multiple secondary batteries face challenges in accurately controlling charge/discharge based on current battery conditions, especially when the interval between charges is long, leading to deviations in degradation condition evaluation and inefficient energy management.
Innovation Solution
A control system that includes a data collecting unit, storing unit, parameter updating units, charging rate estimating unit, and discharge control unit to collect and update parameters based on real-time data during both vehicle operation and charging, allowing for precise control of battery discharge and charge based on estimated charging rates and degradation levels.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If degradation condition is evaluated only during plug-in charge, then measurement precision is improved, but reliability deteriorates when interval between charges is long
Solution Approach 1:
The system performs preliminary degradation evaluation during plug-in charge when conditions are stable, then uses this pre-evaluated degradation condition to guide real-time charge/discharge control decisions during vehicle operation, ensuring reliable control even when charges are infrequent
Solution Approach 2:
The system continuously monitors battery parameters during vehicle operation and compares actual battery behavior against the degradation model, using feedback from voltage, current, and temperature measurements to maintain accurate degradation condition assessment between plug-in charge events
2Device complexity
If charge/discharge control is based on infrequent plug-in charge data, then device complexity is reduced, but measurement precision deteriorates
Solution Approach 1:
The system introduces a degradation evaluation unit that creates an intermediate degradation condition parameter based on plug-in charge data, which then serves as a foundation for real-time control decisions during vehicle operation, bridging the gap between infrequent charges and continuous operation
Solution Approach 2:
The degradation evaluation unit performs preliminary analysis of battery degradation during plug-in charge events, storing degradation parameters that are then used to guide charge/discharge control during subsequent vehicle operation without requiring continuous complex monitoring
3Productivity
If multiple batteries are used to extend driving range, then productivity is improved, but device complexity increases
Solution Approach 1:
The system divides the battery management into independent evaluation and control modules, with each battery having its degradation evaluated separately during plug-in charge, then allowing flexible selection and combination of batteries for discharge during vehicle operation based on real-time needs
Solution Approach 2:
The system dynamically selects which batteries to charge or discharge based on real-time vehicle conditions, battery degradation states, and charging availability, optimizing the use of multiple batteries to extend driving range while adapting to changing operational requirements
4Adaptability or versatility
If battery parameters are updated frequently during vehicle operation, then adaptability is improved, but loss of energy increases
Solution Approach 1:
The system performs comprehensive parameter updates periodically during plug-in charge events when the vehicle is stationary, then uses these updated parameters to guide control decisions during vehicle operation without requiring continuous intensive processing, reducing energy consumption while maintaining adaptability
Data Source
AI summary
A hybrid vehicle (1) includes a battery (10-1), a motor-generator (32-2) operable to produce driving force using electric power of the battery (10-1), a charger (28) operable to charge the battery (10-1) by means of an external power supply, and an ECU (40). The ECU (40) stores a given parameter used in battery model expressions. The parameter varies according to the status of the battery (10-1). During running of the hybrid vehicle (1) and during charging of the battery (10-1) with the external power supply, the ECU (40) collects data related to the status of the battery (10-1), corrects the parameter based on the data, and calculates a value of charging rate (SOC) of the battery (10-1). The ECU (40) controls charge/discharge of the battery (10-1), based on the calculated SOC value.