Fixed-Capacity Compressor Control Using Upstream Air Temperature
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Solution Overview
Problem
Existing motor vehicle heating, ventilation, and air conditioning units with fixed-capacity compressors have inflexible starting and stopping mechanisms based on setpoint temperatures, which do not account for variations in usage conditions, leading to inefficient energy use and suboptimal thermal comfort.
Innovation Solution
A control device that measures upstream airflow temperature to dynamically adjust threshold values for compressor operation, allowing for flexible starting and stopping based on actual thermal load, thereby optimizing energy usage and comfort.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If fixed setpoint temperatures are used to control compressor starting and stopping, then the control system is simple and robust, but the energy efficiency and thermal comfort optimization are insufficient
Solution Approach 1:
The patent applies dynamics by transitioning from fixed setpoint temperatures to dynamic threshold values that adapt in real-time based on measured airflow temperature. The control system continuously adjusts the compressor start/stop thresholds according to actual thermal conditions, enabling energy-efficient operation without requiring complex predictive models or multiple sensors.
Solution Approach 2:
The patent implements feedback by measuring the actual airflow temperature at the evaporator outlet and using this information to dynamically adjust the compressor control thresholds. This closed-loop feedback mechanism allows the system to respond to changing thermal loads and optimize energy consumption based on real-time conditions.
2Adaptability or versatility
If fixed setpoint temperatures are used for compressor control, then the device is robust and easy to manufacture, but the adaptability to varying thermal loads is poor
Solution Approach 1:
The patent applies parameter changes by modifying the control thresholds from fixed values to dynamic values that change based on measured airflow temperature. This allows the system to adapt to varying thermal loads while maintaining a simple manufacturing process, as the adaptation is achieved through software logic rather than hardware modifications.
3Productivity
If the compressor operates based on fixed temperature thresholds, then the control logic is simple, but the thermal comfort optimization and energy savings are limited
Solution Approach 1:
The patent enhances thermal comfort optimization by making the control thresholds dynamic rather than fixed. The system continuously adapts the start/stop temperatures based on actual airflow conditions, allowing for better thermal comfort management while keeping the control logic relatively simple through direct temperature-based adjustments.
Solution Approach 2:
The feedback mechanism measures actual airflow temperature and uses this information to optimize compressor operation timing. This enables the system to achieve better thermal comfort and energy savings by responding to real-time conditions rather than relying on predetermined fixed thresholds.
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 solution enables more efficient energy use by adjusting compressor operation according to current thermal conditions, improving thermal comfort and reducing power consumption in motor vehicle air conditioning systems.
Implementation Method 1
an upstream temperature gage intended to be positioned upstream of said evaporator in said direction of flow in order to measure an upstream temperature T2 of the airflow
Data Source
AI summary
A command device (13) includes a sensor (15,16) for the measurement of a measured value VM of a characteristic C of a fluid FR,A and a comparison (14) of the measured value VM of the characteristic C of the fluid FR,A with at least two step-values VSmin, VSmax of the characteristic C. The command device (13) includes an upstream temperature sensor (20) to be positioned upstream the evaporator (12) according to the air flow direction (6) to measure an upstream temperature T2 of the air flow (3) and give an information (18) which is taken into account by the command device (13) in order to determine the step-values VSmin, VSmax of the characteristic C.