Vehicle Air-Conditioning System Temperature Difference Control
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Solution Overview
Problem
Modern vehicle air-conditioning systems often fail to provide adequate heating due to insufficient heat supply from the heating heat exchanger when engine coolant temperature is below a certain value, leading to unpleasantly cold air in the passenger compartment, and existing solutions do not effectively address the issue during maximum heating power or defroster operations.
Innovation Solution
A method that regulates the air quantity through the heating heat exchanger based on the difference between the engine coolant temperature at the inlet and the air temperature at the outlet, allowing for efficient heating by adjusting the fan speed and air distribution, and includes sensors to detect potential faults in the system components.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If the coolant mass flow through the heating heat exchanger is regulated in dependence on the difference between the coolant inlet temperature and the air outlet temperature, then the heating effectiveness is improved, but the system complexity increases due to additional temperature measurements and control mechanisms
Solution Approach 1:
The system implements feedback control by continuously measuring the coolant inlet temperature and air outlet temperature, calculating their difference, and using this temperature difference signal to regulate the coolant mass flow through the heating heat exchanger. This closed-loop feedback mechanism ensures optimal heating effectiveness while adapting to varying operating conditions.
Solution Approach 2:
The patent replaces complex mechanical temperature regulation mechanisms with an electronic control system that uses temperature sensors and electronic actuators. The electronic system calculates the temperature difference and controls the coolant flow accordingly, simplifying the mechanical structure while improving precision and responsiveness.
2Productivity
If the air quantity flowing through the heating heat exchanger is regulated during maximum heating power or defroster operation, then the heating speed is improved, but the risk of insufficient heat supply increases when coolant temperature is low
Solution Approach 1:
The system dynamically adjusts the air quantity regulation based on real-time coolant temperature conditions. When coolant temperature is sufficient, the system allows higher air flow for rapid heating. When coolant temperature is low, the system automatically reduces air quantity to prevent heat deficiency, ensuring reliable heating across all operating conditions.
Solution Approach 2:
The patent changes the operating parameters of the air conditioning system based on coolant temperature. The air quantity through the heating heat exchanger is adjusted as a variable parameter rather than being fixed, allowing the system to optimize heating speed when conditions permit while maintaining reliability when coolant temperature is insufficient.
3Ease of operation
If the fan speed and air distribution are regulated based on engine coolant temperature, then the heating power setting is simplified, but the passenger comfort deteriorates when coolant temperature is below the threshold value
Solution Approach 1:
The system takes preliminary action by measuring both the coolant inlet temperature and the air outlet temperature before regulating the heating system. This allows the control system to anticipate potential comfort issues and adjust the air quantity and fan speed in advance to maintain comfortable cabin conditions even when coolant temperature is below traditional thresholds.
Solution Approach 2:
The patent implements feedback control that continuously monitors the actual air outlet temperature and compares it with desired comfort levels. This feedback mechanism allows the system to adjust fan speed and air distribution dynamically, ensuring passenger comfort is maintained regardless of coolant temperature variations.
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 approach ensures effective heating by optimizing air quantity regulation, promoting quicker cabin heating and identifying potential faults in the air-conditioning system components, thereby enhancing system reliability and efficiency.
Implementation Method 1
the temperature of the coolant at the inlet into the heating heat exchanger and the temperature of the air at the outlet out of the heating heat exchanger
Data Source
AI summary
A vehicle air-conditioning system and a method for operating that vehicle air-conditioning system in dependence on the difference between the temperature of the engine coolant at the inlet into the heating heat exchanger and the temperature of the air at the outlet out of the heating heat exchanger are provided. The measured or estimated temperatures of the coolant at the inlet into the heating heat exchanger and of the air at the outlet out of the heating heat exchanger are checked to determine whether their values indicate fault states of components of the air-conditioning system.