EV Air Conditioning Power Management During Charging
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Solution Overview
Problem
The existing air conditioning systems in electric vehicles consume excessive electric power during preparatory AC operations, leading to a reduction in battery charge level and a shortened driving range, necessitating a system that efficiently manages electric power usage during charging.
Innovation Solution
An automotive air conditioning system equipped with an SOC detection unit, power adjustment unit, and air-conditioning control unit that detects the battery's state of charge and adjusts electric power usage based on the change in charge level, allowing air conditioning only when the charge level is sufficient and optimizing power consumption by avoiding simultaneous air cooling and heating.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If preparatory AC operation is performed during charge, then comfort in passenger compartment is improved, but battery charge level falls to shorten driving range
Solution Approach 1:
The system dynamically adjusts the air conditioning power consumption based on the battery's state of charge (SOC). When SOC is high, the AC can operate at full power for comfort. When SOC drops below thresholds, the system reduces AC power consumption dynamically, ensuring driving range is maintained while still providing acceptable comfort during charging.
Solution Approach 2:
The system changes operational parameters of the air conditioning based on battery charge level. By monitoring SOC and adjusting AC power consumption parameters accordingly, the system optimizes the balance between passenger comfort and battery charge preservation, preventing excessive discharge during preparatory AC operations.
2Temperature
If air conditioning is operated with high power consumption, then air temperature control is improved, but electric power available for driving is reduced
Solution Approach 1:
The air conditioning system operates dynamically with adjustable power consumption levels. The control unit monitors battery charge level and adjusts AC power consumption in real-time, allowing high power operation when battery is charged and reducing power consumption when battery charge is low, thus maintaining temperature control while preserving driving power.
Solution Approach 2:
The system changes the power consumption parameter of the air conditioning based on battery state. By adjusting operational parameters such as compressor power, fan speed, or temperature setpoints, the system maintains adequate air temperature control while adapting power consumption to available battery charge, ensuring driving power is not excessively reduced.
Data Source
AI summary
An air conditioning system for a passenger compartment of an electric vehicle has a battery unit that is chargeable by supply of electric power from an external power source. The system includes a charge-level detection section to detect a charge level of the battery unit and an HEV controller has an integrated control of the whole of an electric vehicle including an air conditioner. Before a preparatory air-conditioning operation for air conditioning in the passenger compartment during charge, the HEV controller grants permission to enter air conditioning in the passenger compartment if the battery charge level is greater than a predetermined level. The HEV controller adjusts an amount of electric power usable for air conditioning in the passenger compartment based on a change in the charge level.