Electric Compressor Controller Temperature Control During Vehicle Idling
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
The temperature of the controller in an electric compressor for a vehicle air conditioner rapidly increases when the vehicle is stationary, leading to operational interruptions and inconvenience, as existing cooling methods are insufficient during idling.
Innovation Solution
A method is implemented to control the output current of the controller, reducing it in stages until the temperature reaches a reference level, thereby preventing excessive heating and maintaining stable operation by comparing temperature changes per second and adjusting the motor's RPM accordingly.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If the vehicle is stationary during operation, then the cooling effect by vehicle-induced airflow is lost, but the controller temperature rapidly increases
Solution Approach 1:
The control method proactively detects temperature trends and applies current reduction before the controller temperature reaches critical levels that would cause shutdown. By monitoring the rate of temperature increase and predicting future temperature based on current trends, the system takes preliminary cooling action through output current control, preventing the harmful effect of overheating before it occurs.
Solution Approach 2:
The system continuously monitors controller temperature and the rate of temperature change, using this feedback to dynamically adjust the output current. The control method compares the current temperature trend with predefined thresholds and adjusts the motor output accordingly, creating a closed-loop control system that maintains temperature within safe operating ranges while preserving operation continuity.
2Temperature
If the output current is reduced to control temperature, then the controller temperature increases are prevented, but the air conditioner cooling performance decreases
Solution Approach 1:
The control method dynamically adjusts the output current based on real-time temperature conditions rather than applying a fixed reduction. The system continuously monitors temperature trends and adjusts motor RPM accordingly, allowing maximum performance when cooling is needed and applying current reduction only when temperature trends indicate potential overheating. This dynamic approach optimizes the balance between temperature control and cooling performance.
Solution Approach 2:
The system changes the operating parameters (output current, motor RPM) based on temperature conditions. By adjusting these parameters dynamically according to the temperature trend and predefined thresholds, the system maintains optimal performance within safe temperature ranges, preventing excessive temperature increases while minimizing impact on cooling performance.
3Reliability
If the controller temperature exceeds normal range, then the controller stops operating for self-protection, but the electric compressor operation is interrupted
Solution Approach 1:
The control method prevents controller shutdown by taking preliminary action through output current reduction before the temperature reaches the critical threshold that would trigger protective shutdown. This proactive temperature management ensures the controller remains within safe operating ranges, maintaining both self-protection reliability and operation continuity.
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 method effectively prevents overheating of the controller, ensuring continuous operation of the air conditioner without the need for vehicle shutdown and reset, thereby enhancing operational stability and passenger comfort.
Implementation Method 1
detecting the temperature of the controller and determining whether or not the detected temperature is equal to or lower than a reference temperature
Implementation Method 2
controlling an output current of the controller to decrease until the detected temperature reaches the reference temperature or lower
Data Source
AI summary
A method of controlling the temperature of a controller of an electric compressor for an air conditioner in a vehicle is provided, which prevents an excessive increase in temperature of the controller under the control of an output current of the controller. The method includes a temperature-determination stage of detecting the temperature of the controller and determining whether or not the detected temperature is equal to or lower than a reference temperature that is lower than a predefined target temperature by a specified number of degrees when an actuating signal of the air conditioner is generated in a switched-on stage of a vehicle. A current-control stage controls an output current of the controller to decrease the temperature until the detected temperature reaches the reference temperature or lower if the detected temperature is determined to be higher than the reference temperature.