Vehicle Power Supply Control Device Voltage Adaptation
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Solution Overview
Problem
In vehicle power supply systems with multiple power supply systems, existing techniques fail to ensure that controlled units can operate effectively due to the inability of operation setting units to recognize voltage changes in different power supply systems.
Innovation Solution
A control device connected to a different power supply system monitors parameters indicating voltage changes in another system, allowing it to adjust the power supply state of electric loads to maintain constant output regardless of voltage fluctuations, using a DC-DC converter to transform voltages between systems and a cutoff switch to connect/disconnect power lines.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If operation setting unit and controlled unit are connected to different power supply systems, then system versatility is improved, but the operation setting unit cannot recognize voltage of another power supply system causing controlled unit cannot operate favorably
Solution Approach 1:
The patent introduces a communication line as an intermediary between the first and second power supply systems. This communication line enables the operation setting unit in the second power supply system to acquire voltage information from the first power supply system, thereby resolving the inability to recognize voltage across different power supply systems while maintaining system configuration flexibility
Solution Approach 2:
The control device is designed to perform multiple functions: it controls the controlled unit connected to its native power supply system while also monitoring and responding to voltage changes in another power supply system through the communication line. This multi-functionality allows the system to maintain reliable operation across different power supply configurations
2Measurement precision
If dedicated communication lines are used to transmit voltage information between power supply systems, then measurement precision is improved, but device complexity and cost increase
Solution Approach 1:
The communication line serves multiple purposes within the power supply system: it transmits voltage information between power supply systems for control purposes, and can potentially serve other diagnostic and monitoring functions. This multi-functional use justifies the addition of the communication line while managing system complexity
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 enables controlled units to operate favorably by promptly adjusting to voltage changes without the need for dedicated communication lines, reducing delays and costs, and achieving a balance between high and low energy density batteries for efficient power utilization.
Implementation Method 1
using a DC-DC converter to transform voltages between systems
Data Source
AI summary
A vehicle power supply system, a controlled unit is connected to a controllee power supply system that is one of a first power supply system and a second power supply system of the vehicle power supply system. A parameter acquiring unit is connected to a controller power supply system that is another one of the first power supply system and the second power supply system and configured to acquire a parameter indicating a sign of voltage change of the controllee power supply system. An operation setting unit is configured to predict the voltage change of the controllee power supply system in response to the sign indicated by the parameter and set a power supply state of the controlled unit indicating at least one of a number of drive pulses per unit time, a duty ratio, and a drive current so as to obtain a constant output from the controlled unit.