Method for managing a reversible air-conditioning circuit of a motor vehicle
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Solution Overview
Problem
Conventional motor vehicle air conditioning circuits require shutdown and pressure balancing to switch between operating modes, causing user discomfort due to interruptions in thermal management.
Innovation Solution
A reversible air conditioning circuit with a central control unit that manages the transition between cooling, dehumidification, and heat pump modes by measuring and adjusting refrigerant fluid pressure differences across shut-off valves, allowing seamless mode changes without stopping the compressor or waiting for pressure equilibrium.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the air conditioning circuit uses a conventional shutdown method to switch between operating modes, then the pressure balancing between different modes is achieved, but the thermal management is interrupted causing user discomfort
Solution Approach 1:
The control unit performs preliminary actions by pre-positioning shut-off valves and pre-adjusting refrigerant flow paths before the mode transition is initiated. This allows the system to switch modes without interrupting the compressor operation, maintaining continuous thermal management while achieving pressure balancing through controlled valve operations.
Solution Approach 2:
The patent introduces an intermediary control strategy that uses multiple shut-off valves and intermediate pressure zones to manage the transition between operating modes. The control unit acts as an intermediary, coordinating valve operations to balance pressures gradually without requiring a complete shutdown, thus maintaining thermal management continuity.
2Reliability
If the air conditioning circuit waits for pressure equilibrium before switching modes, then safe operation is ensured, but the switching time is extended causing user discomfort
Solution Approach 1:
The control unit maintains continuous refrigerant circulation and compressor operation during mode transitions by coordinating shut-off valve operations. The system ensures safe mode switching through controlled pressure management while avoiding complete shutdowns, thereby reducing switching time and maintaining thermal management continuity without compromising safety.
Solution Approach 2:
The patent employs dynamic control of shut-off valves and refrigerant flow paths during mode transitions. The control unit dynamically adjusts valve positions and refrigerant circulation patterns to achieve pressure balancing more quickly, reducing the waiting time for pressure equilibrium while ensuring safe operation throughout the transition process.
3Adaptability or versatility
If the air conditioning circuit uses a reversible configuration with multiple heat exchangers, then multiple operating modes are enabled, but the system complexity increases
Solution Approach 1:
The patent implements a reversible air conditioning circuit where heat exchangers serve multiple functions depending on the operating mode. The first heat exchanger acts as a condenser in cooling mode and as an evaporator in heat pump mode, while the second heat exchanger serves complementary functions. This multi-functionality reduces the need for dedicated components for each mode, managing system complexity while enabling versatile operation.
Solution Approach 2:
The reversible circuit is segmented into distinct functional zones with controlled refrigerant flow paths. By using multiple shut-off valves to segment the circuit, the system can isolate and activate only the necessary components for each operating mode, effectively managing complexity by enabling selective operation of circuit segments rather than requiring all components to be active simultaneously.
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
Enables smooth transitions between operating modes without disrupting thermal comfort, reducing user discomfort and maintaining continuous thermal management in the passenger compartment.
Implementation Method 1
a two-fluid heat exchanger arranged jointly on the first refrigerant fluid loop and on the second heat transfer fluid loop, so as to allow heat exchange between said loops
Implementation Method 2
a refrigerant fluid passes successively through a compressor, a first heat exchanger, called a condenser, placed in contact with an air flow outside the motor vehicle to release heat
Implementation Method 3
a device expansion and a second heat exchanger, called evaporator, placed in contact with a flow of air inside the motor vehicle to cool it
Data Source
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AI summary
The present invention concerns a method for managing a reversible air-conditioning circuit (1) capable of operating in: ◦ a cooling mode in which an interior air flow (100) intended for the passenger compartment is cooled, the heat energy recovered from the interior air flow (100) being discharged into an external air flow (200) outside the motor vehicle, ◦ a first dehumidifying mode in which the interior air flow (100) is cooled and then heated before arriving in the passenger compartment, ◦ a heat pump mode in which the interior air flow (100) is heated, the heat energy heating the interior air flow (100) being recovered from the external air flow (200), and ◦ a second dehumidifying mode in which the interior air flow (100) is cooled and then heated before arriving in the passenger compartment, the reversible air-conditioning circuit (1) comprising a central control unit (40) suitable for controlling the shifting from one operating mode to another according to a mode transition model which passes: ◦ in a first direction, through the cooling mode, the first dehumidifying mode, the second dehumidifying mode, then the heat pump mode, and ◦ in a second direction, through the heat pump mode, the second dehumidifying mode, the first dehumidifying mode, then the cooling mode.