Vehicle Power Management for AC Restriction During External Supply
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Solution Overview
Problem
During external power supply in vehicles, the state of charge (SOC) of the battery can suddenly decrease when both external power supply and air conditioning are used simultaneously, leading to reduced comfort for occupants due to uniform restriction of air conditioning operations.
Innovation Solution
A vehicle power management system that determines whether to execute operation restrictions on the air conditioner based on specific conditions such as target blowout temperature, outside air temperature, refrigerant temperature, and blower air volume, and when these conditions are met, it restricts the air conditioner's operation to prevent excessive battery discharge by switching to inside air circulation, thereby maintaining comfort and conserving battery charge.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If the air conditioner operates in power saving mode during external power supply, then the battery discharge is suppressed, but the occupant comfort deteriorates
Solution Approach 1:
The patent applies local quality by differentiating air conditioning control strategies based on specific operational conditions. Instead of uniform power saving mode, the system selectively applies operation restrictions only when strong cooling or heating conditions are detected (based on temperature differentials, humidity, and external conditions), while maintaining normal operation in milder conditions, thus preserving occupant comfort where possible while suppressing battery discharge when necessary
Solution Approach 2:
The system dynamically adjusts air conditioner operation based on real-time monitoring of multiple parameters including battery charge level, external temperature, internal cabin temperature, and humidity conditions. The determination unit continuously evaluates whether strong cooling/heating conditions exist and dynamically switches between normal operation and operation restriction modes, optimizing the balance between battery conservation and comfort maintenance
2Loss of energy
If the air conditioner operation is uniformly restricted during external power supply, then the battery charge is preserved, but the air conditioning capacity is reduced
Solution Approach 1:
The patent implements partial action by applying operation restrictions only partially - specifically when strong cooling or heating conditions are detected through multiple parameter evaluation. The determination unit assesses temperature differentials, humidity levels, and external conditions to decide whether restriction is necessary, thereby preserving battery charge only when truly needed while maintaining full air conditioning capacity during milder conditions
Solution Approach 2:
The system changes operational parameters dynamically based on environmental conditions and battery state. The determination unit monitors temperature, humidity, and battery charge parameters, and adjusts the air conditioner's operation mode accordingly - switching between normal capacity operation and restricted operation based on the evaluated parameters, thus optimizing both battery preservation and air conditioning performance
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 effectively suppresses excessive battery discharge by restricting air conditioner operation only in strong cooling or heating states, improving occupant comfort and maintaining air conditioning capacity through inside air circulation, while preventing battery over-discharge during external power supply.
Implementation Method 1
a refrigerant temperature after heat is exchanged with an air blown into the vehicle cabin
Implementation Method 2
a refrigerant temperature after heat is exchanged with an air blown into the vehicle cabin
Data Source
AI summary
A vehicle power management system includes a battery, an air conditioner driven by power of the battery, an external power supply device that enables external power supply where the power of the battery is supplied to an external electric device, and a determination unit. The determination unit determines whether an operation restriction of an air conditioner is executed during the external power supply. The determination unit determines that the operation restriction is executed when all of following four conditions are satisfied: (A-1) a target blowout temperature is less than a predetermined blowout threshold temperature during cooling; (A-2) an outside air temperature exceeds a predetermined outside air threshold temperature during cooling; (A-3) a refrigerant temperature after heat is exchanged with an air blown into the vehicle cabin exceeds a predetermined refrigerant threshold temperature during cooling; and (A-4) a blower air volume of the air conditioner exceeds a predetermined threshold air volume.