Low-Voltage DC-DC Converter Control for Hybrid Vehicle Battery Abnormalities
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing hybrid vehicle systems lack a method to effectively control battery charging voltage when abnormalities occur, such as detection failures of battery state of charge, leading to inefficient energy consumption and reduced fuel efficiency.
Innovation Solution
A control method and system for a low-voltage DC-DC converter that analyzes failure causes of the intelligent battery system and adjusts the charging voltage based on factors like battery temperature and output power, using map data to determine appropriate output voltages to prevent excessive power consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the battery charging voltage is controlled using a fixed method, then the control system is simple, but the fuel efficiency cannot be improved when battery abnormalities occur
Solution Approach 1:
The patent implements dynamic control of the DC-DC converter output voltage based on real-time battery state assessments. The controller adjusts charging voltage according to battery temperature, charge/discharge state, and detected abnormalities, transitioning from fixed voltage control to adaptive dynamic control that optimizes fuel efficiency under varying operating conditions
Solution Approach 2:
The system incorporates feedback mechanisms by continuously monitoring battery temperature, charge/discharge state, and abnormality detection results. The controller uses this feedback information to adjust the DC-DC converter output voltage, creating a closed-loop control system that improves fuel efficiency while maintaining battery safety
2Productivity
If the charging voltage is increased to charge the battery faster, then the charging speed is improved, but excessive power consumption occurs when the battery is abnormal
Solution Approach 1:
The patent changes the output voltage parameter of the DC-DC converter based on battery abnormality detection. When abnormalities are detected, the controller adjusts the output voltage to a predetermined level that prevents excessive power consumption while still enabling safe charging operation, thereby reducing energy loss without completely disabling charging functionality
Solution Approach 2:
The system prepares predetermined voltage levels in advance for different abnormality scenarios. By pre-setting appropriate voltage values for various battery conditions, the controller can quickly respond to abnormalities without causing excessive power consumption, cushioning against potential energy waste before it occurs
3Reliability
If the battery charging is controlled without considering abnormality causes, then the control method is simple, but the battery safety and fuel efficiency are compromised
Solution Approach 1:
The patent segments the control process into distinct phases: normal operation mode and abnormality handling mode. When abnormalities are detected, the system transitions to a segmented approach that identifies specific failure causes (such as sensor failures, communication failures, or battery faults) and applies targeted control strategies for each type, improving safety without requiring complete system redesign
Solution Approach 2:
The controller acts as an intermediary that manages the transition between normal and abnormal operating modes. It receives information from various sensors and subsystems, processes abnormality data, and mediates the response by adjusting DC-DC converter output accordingly, thereby maintaining battery safety while managing the complexity of abnormality handling
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
This approach allows for improved vehicle fuel efficiency by dynamically adjusting the charging voltage according to the failure cause of the battery, preventing excessive power consumption and ensuring stable vehicle operation.
Implementation Method 1
a low-voltage direct current-direct current (DC-DC) converter (LDC) which converts output between high voltage and low voltage
Data Source
AI summary
A method of controlling a low-voltage DC-DC converter for a hybrid vehicle is provided. The method includes determining whether an intelligent battery system fails and analyzing a failure cause of the intelligent battery system when the intelligent battery system is determined to fail. A first voltage is deduced using a battery temperature when the failure cause is determined to be a detection failure of battery SOC and an output voltage of a low-voltage DC-DC converter is adjusted to be the first voltage.