Electric Compressor Inverter Overheat Control Under High Load
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Solution Overview
Problem
Electric compressors in air conditioning systems face overheating issues due to high load conditions, leading to reduced performance and potential damage, especially in vehicles exposed to high outdoor temperatures or direct sunlight, which affects the inverter unit and results in inefficient energy use and risk of component failure.
Innovation Solution
A control method for electric compressors that monitors discharge pressure, revolutions per minute, inverter unit temperature, and phase current to detect overheating, switching the compressor to a temporary stop state and restarting based on pressure conditions to prevent inverter unit damage, while ensuring safe operation and maintaining durability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If the electric compressor is driven under high load conditions to maintain cooling performance, then the cooling capability is improved, but the temperature of the inverter unit rises significantly causing overheating and potential damage
Solution Approach 1:
The control unit performs preliminary detection of overheating conditions by monitoring inverter unit temperature, discharge pressure, and motor revolutions before actual damage occurs. When overheating is detected, the control unit proactively adjusts motor revolutions or stops the compressor in advance, preventing thermal damage to the inverter unit while maintaining cooling performance as much as possible.
2Temperature
If the electric compressor is stopped to reduce heat generation and protect the inverter unit, then the temperature is reduced, but the cooling performance is degraded and energy efficiency is reduced
Solution Approach 1:
The control unit dynamically adjusts the operating state of the electric compressor based on real-time monitoring of inverter unit temperature, discharge pressure, and motor revolutions. Instead of a fixed stop/start control, the system continuously adapts motor revolutions or temporarily stops the compressor only when necessary, optimizing the balance between temperature control and cooling performance.
3Temperature
If the maximum revolutions per minute of the electric compressor is reduced to prevent overheating, then the inverter unit temperature is controlled, but the driving performance and cooling capacity are reduced
Solution Approach 1:
The control unit implements feedback control by continuously monitoring inverter unit temperature, discharge pressure, and motor revolutions. Based on this feedback, the control unit adjusts motor revolutions in real-time, allowing the compressor to operate at high speeds when temperature conditions permit and reducing speed or stopping when overheating is detected, thereby maintaining both performance and temperature control.
4Productivity
If the electric compressor operates continuously to maintain cooling, then the cooling performance is maintained, but the inverter unit accumulates heat and may be damaged
Solution Approach 1:
The control unit performs preliminary detection of overheating conditions by monitoring inverter unit temperature, discharge pressure, and motor revolutions before actual damage occurs. When overheating is detected, the control unit proactively adjusts motor revolutions or stops the compressor in advance, preventing thermal damage to the inverter unit while maintaining cooling performance as much as possible.
5Reliability
If the electric compressor is stopped frequently to prevent overheating, then the inverter unit is protected, but the energy efficiency and system durability are reduced
Solution Approach 1:
The control unit dynamically adjusts the operating state of the electric compressor based on real-time monitoring of inverter unit temperature, discharge pressure, and motor revolutions. Instead of a fixed stop/start control, the system continuously adapts motor revolutions or temporarily stops the compressor only when necessary, optimizing the balance between temperature control and cooling performance.
Data Source
AI summary
An electric compressor of an air conditioning system and a control method thereof. In one method, a stable operation of the electric compressor is ensured by means of logic to protect an inverter unit provided in the electric compressor before an inverter element is damaged due to overheating, so that safety can be secured.