Auxiliary Battery Switching for Stable Parked-Vehicle Load Power
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Solution Overview
Problem
Existing vehicle battery systems with ISG technology face instability in power supply due to the use of a heavy and bulky LDC unit, which increases weight, reduces internal space, and is costly, making it difficult to pack and assemble, while failing to provide stable power to multiple loads.
Innovation Solution
An auxiliary battery system with a lithium battery module and a voltage converter, controlled by an auxiliary battery control module, that stabilizes power supply to loads by using a switching module and monitoring battery state, ensuring power is provided to critical loads even during ISG restarts.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If an independent low-voltage DC-to-DC converter (LDC) unit is used to stabilize voltage during ISG restart, then power supply stability is improved, but vehicle weight increases and internal space is reduced
Solution Approach 1:
The patent combines the LDC unit with the auxiliary battery system into an integrated power management system. The auxiliary battery (12V or 24V) works in conjunction with the LDC unit to provide stable power during ISG restart, eliminating the need for a separate independent LDC unit while maintaining voltage stability.
Solution Approach 2:
The auxiliary battery system serves multiple functions: it stabilizes voltage during ISG restart, provides power to loads during vehicle operation, and can charge the starting battery. This multi-functionality reduces the need for separate components, thereby reducing overall weight while maintaining reliability.
2Reliability
If an independent low-voltage DC-to-DC converter (LDC) unit is used to stabilize voltage during ISG restart, then power supply stability is improved, but assembly cost increases and packaging difficulty increases
Solution Approach 1:
The LDC unit is integrated with the auxiliary battery system rather than being installed as a separate component. This integration simplifies the assembly process, reduces the number of installation steps, and lowers assembly costs while maintaining the voltage stabilization function during ISG restart.
Solution Approach 2:
The integrated auxiliary battery system performs multiple functions including voltage stabilization, power supply to loads, and starting battery charging. This multi-functionality reduces the total number of components needed, simplifying manufacturing and packaging while maintaining power supply stability.
3Reliability
If the auxiliary battery provides continuous power to all loads during parking, then power supply stability is improved, but energy consumption increases
Solution Approach 1:
The switching module dynamically controls the connection between the auxiliary battery and loads based on real-time conditions. During parking, it selectively connects only necessary loads to the auxiliary battery, adjusting the power supply configuration to minimize energy consumption while maintaining stability for critical systems.
Solution Approach 2:
The control module continuously monitors the vehicle's power needs and battery state of charge, using this feedback to intelligently manage power distribution. This feedback mechanism ensures the auxiliary battery provides power only when necessary, reducing overall energy consumption while maintaining power supply stability for essential loads.
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
The system provides stable power to multiple loads, reduces weight and cost by eliminating the LDC unit, enhances safety by preventing battery depletion, and allows user monitoring and control through a user terminal.
Implementation Method 1
an auxiliary battery configured to store power used in a plurality of loads of the vehicle
Implementation Method 2
a switching module electrically connected between the auxiliary battery and the first load
Data Source
AI summary
An auxiliary battery system of a vehicle and a method of using the same include an auxiliary battery, a switching module, and an auxiliary battery control module, and the auxiliary battery stores power used in a plurality of loads of the vehicle, and configured to provide the power to a first load and a second load among the plurality of loads in a state in which the vehicle is parked, the switching module is electrically connected between the auxiliary battery and the first load, and the auxiliary battery control module is configured to determine whether a vehicle communication network enters a sleep mode in the state where a vehicle is parked, turn on a switching module when it is determined that the vehicle communication network has not entered the sleep mode, and turn off the switching module when a predetermined time period has elapsed after it is determined that the vehicle communication network has entered the sleep mode.