EP4646334A1 - Procede de controle pour la maximisation de la puissance thermique - Google Patents
Procede de controle pour la maximisation de la puissance thermiqueInfo
- Publication number
- EP4646334A1 EP4646334A1 EP23837656.0A EP23837656A EP4646334A1 EP 4646334 A1 EP4646334 A1 EP 4646334A1 EP 23837656 A EP23837656 A EP 23837656A EP 4646334 A1 EP4646334 A1 EP 4646334A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- value
- heat exchanger
- temperature
- subcooling
- refrigerant fluid
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60H—ARRANGEMENTS OF HEATING, COOLING, VENTILATING OR OTHER AIR-TREATING DEVICES SPECIALLY ADAPTED FOR PASSENGER OR GOODS SPACES OF VEHICLES
- B60H1/00—Heating, cooling or ventilating devices
- B60H1/00642—Control systems or circuits; Control members or indication devices for heating, cooling or ventilating devices
- B60H1/00814—Control systems or circuits characterised by their output, for controlling particular components of the heating, cooling or ventilating installation
- B60H1/00878—Control systems or circuits characterised by their output, for controlling particular components of the heating, cooling or ventilating installation the components being temperature regulating devices
- B60H1/00885—Controlling the flow of heating or cooling liquid, e.g. valves or pumps
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60H—ARRANGEMENTS OF HEATING, COOLING, VENTILATING OR OTHER AIR-TREATING DEVICES SPECIALLY ADAPTED FOR PASSENGER OR GOODS SPACES OF VEHICLES
- B60H1/00—Heating, cooling or ventilating devices
- B60H1/32—Cooling devices
- B60H1/3204—Cooling devices using compression
- B60H1/3205—Control means therefor
- B60H1/3211—Control means therefor for increasing the efficiency of a vehicle refrigeration cycle
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60H—ARRANGEMENTS OF HEATING, COOLING, VENTILATING OR OTHER AIR-TREATING DEVICES SPECIALLY ADAPTED FOR PASSENGER OR GOODS SPACES OF VEHICLES
- B60H1/00—Heating, cooling or ventilating devices
- B60H1/00642—Control systems or circuits; Control members or indication devices for heating, cooling or ventilating devices
- B60H1/00814—Control systems or circuits characterised by their output, for controlling particular components of the heating, cooling or ventilating installation
- B60H1/00878—Control systems or circuits characterised by their output, for controlling particular components of the heating, cooling or ventilating installation the components being temperature regulating devices
- B60H2001/00949—Control systems or circuits characterised by their output, for controlling particular components of the heating, cooling or ventilating installation the components being temperature regulating devices comprising additional heating/cooling sources, e.g. second evaporator
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60H—ARRANGEMENTS OF HEATING, COOLING, VENTILATING OR OTHER AIR-TREATING DEVICES SPECIALLY ADAPTED FOR PASSENGER OR GOODS SPACES OF VEHICLES
- B60H1/00—Heating, cooling or ventilating devices
- B60H1/32—Cooling devices
- B60H2001/3236—Cooling devices information from a variable is obtained
- B60H2001/3248—Cooling devices information from a variable is obtained related to pressure
- B60H2001/3251—Cooling devices information from a variable is obtained related to pressure of the refrigerant at a condensing unit
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60H—ARRANGEMENTS OF HEATING, COOLING, VENTILATING OR OTHER AIR-TREATING DEVICES SPECIALLY ADAPTED FOR PASSENGER OR GOODS SPACES OF VEHICLES
- B60H1/00—Heating, cooling or ventilating devices
- B60H1/32—Cooling devices
- B60H2001/3236—Cooling devices information from a variable is obtained
- B60H2001/3255—Cooling devices information from a variable is obtained related to temperature
- B60H2001/3258—Cooling devices information from a variable is obtained related to temperature of the air at a condensing unit
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60H—ARRANGEMENTS OF HEATING, COOLING, VENTILATING OR OTHER AIR-TREATING DEVICES SPECIALLY ADAPTED FOR PASSENGER OR GOODS SPACES OF VEHICLES
- B60H1/00—Heating, cooling or ventilating devices
- B60H1/32—Cooling devices
- B60H2001/3236—Cooling devices information from a variable is obtained
- B60H2001/3255—Cooling devices information from a variable is obtained related to temperature
- B60H2001/326—Cooling devices information from a variable is obtained related to temperature of the refrigerant at a condensing unit
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60H—ARRANGEMENTS OF HEATING, COOLING, VENTILATING OR OTHER AIR-TREATING DEVICES SPECIALLY ADAPTED FOR PASSENGER OR GOODS SPACES OF VEHICLES
- B60H1/00—Heating, cooling or ventilating devices
- B60H1/32—Cooling devices
- B60H2001/3236—Cooling devices information from a variable is obtained
- B60H2001/3255—Cooling devices information from a variable is obtained related to temperature
- B60H2001/3261—Cooling devices information from a variable is obtained related to temperature of the air at an evaporating unit
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60H—ARRANGEMENTS OF HEATING, COOLING, VENTILATING OR OTHER AIR-TREATING DEVICES SPECIALLY ADAPTED FOR PASSENGER OR GOODS SPACES OF VEHICLES
- B60H1/00—Heating, cooling or ventilating devices
- B60H1/32—Cooling devices
- B60H2001/3236—Cooling devices information from a variable is obtained
- B60H2001/3255—Cooling devices information from a variable is obtained related to temperature
- B60H2001/3263—Cooling devices information from a variable is obtained related to temperature of the refrigerant at an evaporating unit
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60H—ARRANGEMENTS OF HEATING, COOLING, VENTILATING OR OTHER AIR-TREATING DEVICES SPECIALLY ADAPTED FOR PASSENGER OR GOODS SPACES OF VEHICLES
- B60H1/00—Heating, cooling or ventilating devices
- B60H1/32—Cooling devices
- B60H2001/3269—Cooling devices output of a control signal
- B60H2001/327—Cooling devices output of a control signal related to a compressing unit
- B60H2001/3272—Cooling devices output of a control signal related to a compressing unit to control the revolving speed of a compressor
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60H—ARRANGEMENTS OF HEATING, COOLING, VENTILATING OR OTHER AIR-TREATING DEVICES SPECIALLY ADAPTED FOR PASSENGER OR GOODS SPACES OF VEHICLES
- B60H1/00—Heating, cooling or ventilating devices
- B60H1/32—Cooling devices
- B60H2001/3269—Cooling devices output of a control signal
- B60H2001/3285—Cooling devices output of a control signal related to an expansion unit
Definitions
- the field of the present invention is that of refrigerant fluid circuits and heat treatment systems including such refrigerant fluid circuits, in particular for motor vehicles.
- Motor vehicles are commonly equipped with refrigerant circuits used to heat or cool different areas or components of the vehicle. It is particularly known to use a refrigerant fluid circuit to thermally treat a flow of interior air sent into the passenger compartment of the vehicle and/or a flow of heat transfer liquid sent to the battery.
- a refrigerant fluid circuit is known to include a pair of heat exchangers intended to carry out a thermodynamic cycle in order to provide energy capable of cooling the passenger compartment of the vehicle and/or the battery in the case of a electric vehicle, whether during use of the vehicle in driving phases, or when the vehicle is stopped.
- This pair of heat exchangers thus comprises a heat exchanger capable of operating as an evaporator and another heat exchanger capable of operating as a condenser.
- the heat exchanger capable of operating as an evaporator may be an exchanger allowing heat exchange between refrigerant and air, and making it possible to cool the passenger compartment using a flow of cooled interior air, this heat exchanger being crossed by this internal air flow which it treats thermally.
- the exchanger capable of operating as an evaporator can also be an exchanger allowing heat exchange between refrigerant and a heat transfer liquid, and making it possible to cool for example the battery using a flow of cooled heat transfer liquid, this heat exchanger being crossed by this flow of heat transfer liquid that it treats thermally.
- this evaporator is a part of a ventilation, heating and/or air conditioning installation fitted to the vehicle.
- Document FR3081086B1 presents an invention whose object is a method of controlling such a type of refrigerant fluid circuit for automobiles making it possible to cool the air flow adequately while limiting the consumption linked to the operation of said circuit.
- Said refrigerant fluid circuit comprising at least one refrigerant fluid compression device, a first heat exchanger arranged to be crossed by a flow of air from outside a passenger compartment of the vehicle, a second heat exchanger arranged to be crossed by a flow of internal air sent into the passenger compartment of the vehicle, a variable section expansion member arranged between the first heat exchanger and the second heat exchanger, an accumulation device arranged between the second heat exchanger and the compression device, the control method comprising at least one step of controlling the degree of opening of the control member expansion, characterized in that the degree of opening controls an optimal setpoint subcooling “Tsbc” of the refrigerant fluid at the outlet of the first heat exchanger, the setpoint subcooling “Tsbc” being calculated using at least one temperature of condensation “T
- a disadvantage of this process is that it favors optimization of consumption to the detriment of other possible optimization criteria.
- One aspect of the invention relates to a method of controlling a refrigerant fluid circuit for a vehicle, said refrigerant fluid circuit comprising at least one device for compressing the refrigerant fluid, a first heat exchanger arranged to be crossed by a flow of a first heat transfer fluid and intended to condense the refrigerant fluid, a second heat exchanger arranged to be crossed by a flow of a second heat transfer fluid and intended to evaporate the refrigerant fluid, an expansion member with section variable disposed between the first heat exchanger and the second heat exchanger, a refrigerant fluid accumulation device disposed between the first heat exchanger and the compression device, the method comprising a step of determining a value of a quantity representative of a high pressure of the refrigerant fluid between the outlet of the compression device and the inlet of the expansion member, the method also comprising a step of comparison between said value of quantity representative of the high pressure and a threshold value maximum, in which the method comprises a mode of maximizing the thermal power, the passage into this
- this aspect of the invention aims to maximize the thermal power for cooling the second heat transfer fluid or for heating the first heat transfer fluid while respecting the limitations of the system such as the maximum pressure limitation authorized at the outlet of the compression device.
- Method 2 is applicable within a heat transfer fluid cooling mode and/or within a heat transfer fluid heating mode according to the mode being executed by the program configured to implement said method, with steps of said method 2 adapted to said mode.
- the process may include one or more of the following characteristics, taken in isolation or in all technically possible combinations:
- the maximization of the thermal power is a maximization of the cooling power of the second heat transfer fluid in the second heat exchanger
- the increase in the degree of opening of the expansion member within the step of increasing the degree of opening of the expansion member is controlled so that the value of the quantity representative of the high pressure is equal to a pressure setpoint value when the magnitude value representative of the high pressure is greater than said pressure setpoint value;
- said circuit comprises a pressure sensor for measuring the pressure of the refrigerant fluid between the outlet of the compression device and the inlet of the expansion member, an output signal from said sensor being said magnitude value representative of the high pressure ;
- the method comprises a step of determining a value of a first temperature of the second heat transfer fluid downstream of the second heat exchanger;
- the method comprises a step of comparing the value of the first temperature with a cooling setpoint temperature value, said at least one transition condition including said step of comparing the value of the first temperature;
- said at least one passage condition includes the condition that a result of said step of comparing the value of the first temperature is that the value of the first temperature of the second heat transfer fluid downstream of the second heat exchanger is greater than the cooling set temperature value + a, with a which is a constant having as preferential value a value between 0.2°C and 1°C;
- the speed of the compression device in the step of increasing the speed of the compression device in the mode of maximizing the cooling power is controlled so that the value of the first temperature of the second heat transfer fluid is included between the cooling setpoint temperature value - a and the cooling setpoint temperature value + a, with a which is a constant having as preferential value a value between 0.2°C and 1°C, the process controlling increasing the speed of the compression device when the first temperature value of the second heat transfer fluid is greater than the cooling set temperature value + a, the method controlling the reduction in the speed of the compression device when the value of first temperature of the second heat transfer fluid is lower than the cooling setpoint temperature value Tsfc2c - a;
- the circuit comprises a temperature sensor for measuring the first temperature of the second heat transfer fluid downstream of the second heat exchanger, an output signal from said temperature sensor being said first temperature value;
- the method comprises a step of determining a second condensation temperature in the first heat exchanger
- the determination of the second condensation temperature in the step of determining the second condensation temperature in the first heat exchanger is carried out from the value of said quantity representative of the pressure or of another quantity representative of the refrigerant pressure in the first heat exchanger;
- the circuit comprises a temperature sensor for measuring the temperature of the refrigerant fluid in the first heat exchanger, an output signal from said temperature sensor being said second condensation temperature value;
- the method comprises a step of determining a third temperature of the first heat transfer fluid upstream of the first heat exchanger
- the circuit comprises a temperature sensor for measuring the third temperature of the first heat transfer fluid upstream of the first heat exchanger, an output signal from said temperature sensor being said third temperature value;
- the method comprises a step of determining the value of a fourth temperature of the refrigerant fluid between the outlet of the first heat exchanger and the inlet of the expansion member;
- the circuit comprises a temperature sensor for measuring the fourth temperature of the refrigerant fluid between the outlet of the first heat exchanger and the inlet of the expansion member, an output signal from said temperature sensor being said value of the fourth temperature;
- the method comprises a step of calculating a sub-cooling such that said sub-cooling is equal to the difference between the second condensation temperature and the fourth temperature of the refrigerant fluid leaving the first heat exchanger;
- the method comprises a step of comparing the subcooling value and the minimum subcooling threshold value, said at least one passing condition including said step of comparing the subcooling value; - said at least one passing condition includes the condition that a result of the step of comparing the subcooling value and the minimum subcooling threshold value is that the subcooling value is greater than the value minimum subcooling threshold;
- the method comprises a step of comparing the speed of the compression device with a maximum speed threshold value, said at least one passage condition including said step of comparing the speed of the compression device;
- said at least one passing condition includes the condition that a result of the step of comparing the speed of the compression device with the maximum speed threshold value is that said speed of the compression device is less than the maximum threshold value of speed;
- the method includes a step of maintaining the speed of the compression device and the degree of opening of the expansion member;
- the method applies the maintenance step when at least one of said at least one condition of passage into the thermal power maximization mode, other than the condition of exceeding or reaching the maximum threshold value by said quantity representative of high pressure, is not obtained;
- the method comprises a mode of optimizing the consumption of the compression device, the passage into said mode comprising a step of controlling the degree of opening of the expansion member and a step of controlling the speed of the compression device , the passage into said consumption optimization mode being carried out under at least one first condition of passage into said consumption optimization mode, said at least one first condition of passage into said optimization mode including that the value of quantity representative of high pressure is less than the maximum pressure threshold value;
- the method comprises a step of controlling the degree of opening of the expansion member allowing regulation of the subcooling at the outlet of the first heat exchanger by controlling the degree of opening of the expansion member so as to that the subcooling value is between the set subcooling value - p and the set subcooling value + p, with p being a constant whose value is preferably between 0.2° C and 1 °C, the degree of opening of the expansion device increasing when the subcooling value is greater than the set subcooling value + p, and decreasing when the subcooling value is lower at the subcooling setpoint value - P;
- the maximization of the thermal power is a maximization of the heating power of the first heat transfer fluid in the first heat exchanger
- the method comprises a step of determining the eighth temperature value of the first heat transfer fluid downstream of the first heat exchanger
- the circuit comprises a temperature sensor for measuring the eighth temperature of the first heat transfer fluid downstream of the first heat exchanger, an output signal from said temperature sensor being said eighth temperature value;
- the method comprises a step of comparison between the value of the eighth air temperature downstream of the first heat exchanger and a heating setpoint temperature value, said at least one condition for switching to the mode of maximizing the heat heating power including said step of comparing the temperature value;
- said at least one condition for switching to the heating power maximization mode includes the condition that a result of the step of comparing the value of the eighth temperature with the heating setpoint temperature value is that the value of the eighth temperature of the first heat transfer fluid at the outlet of the first heat exchanger heat is lower than the heating setpoint temperature value - a, with a which is a constant having as preferential value a value between 0.2°C and 1°C;
- the method includes an alternative step of increasing the speed of the compression device in the mode of maximizing the heating power
- the circuit comprises an additional electric heating device heating the second heat transfer fluid upstream of the second heat exchanger
- the method comprising, in the mode of maximizing the heating power, a step of increasing the power of the additional electric heating device;
- the increase in the power of the additional electric heating device in the step of increasing the power of the additional electric heating device is controlled so that the value of the eighth temperature of the first heat transfer fluid at the outlet of the first heat exchanger is between the heating setpoint temperature value - a and the heating setpoint temperature value + a, with a which is a constant having as preferential value a value between 0.2°C and 1° C, the method controlling the increase in power of the electric heating device additional when the value of eighth temperature of first heat transfer fluid is less than the value of heating set temperature - a, the method controlling the reduction of the power (Pwr) of the additional electric heating device when the value of eighth temperature of first heat transfer fluid is greater than the heating setpoint temperature value + a;
- the method comprises an alternative mode of optimizing the consumption of the compression device
- the passage into said alternative mode of optimizing consumption comprises an alternative step of controlling the degree of opening of the expansion member and a step alternative control of the speed of the compression device
- the passage into said alternative consumption optimization mode being carried out under at least one first condition of passage into said alternative consumption optimization mode, said at least one first condition passage into said optimization mode including that the value of the quantity representative of the high pressure is less than the maximum pressure threshold value
- the alternative step of controlling the degree of opening of the expansion member allows regulation of the subcooling at the outlet of the first heat exchanger by controlling the degree of opening of the expansion member so that the subcooling value is between the second setpoint subcooling value - p and the second setpoint subcooling value + p, with p being a constant whose value is preferably between 0.2 °C and 1 °C, the degree of opening of the expansion device increasing when the subcooling value is greater than the second setpoint subcooling value + p, and decreasing when the subcooling value is lower than the second subcooling setpoint value - p.
- Figure 1 is a schematic view of a first refrigerant fluid circuit to which a method according to the invention is applied
- Figure 2 is a flowchart describing an implementation of the method according to a first aspect of the invention.
- FIG. 3 is a flowchart describing an implementation of the method according to a second aspect of the invention.
- Figure 4 is a schematic view of a second refrigerant fluid circuit to which the method according to the invention is applied,
- FIG. 5 is a schematic view of a third refrigerant fluid circuit to which the method according to the invention is applied.
- Figure 6 is a flowchart describing an implementation of the method according to a third aspect of the invention.
- FIG. 7 is a flowchart describing an implementation of the method according to a fourth aspect of the invention.
- Figure 8 is a schematic view of a fourth refrigerant fluid circuit to which the method according to the invention is applied.
- Figure 9 is a schematic view of a fifth refrigerant fluid circuit to which the method according to the invention is applied.
- inlet and outlet used in the following description refer to the direction of circulation of the fluid considered.
- a branch is a portion of a circuit connecting one point of the circuit to another point of the circuit.
- the thermal conditioning system SCT comprises a refrigerant fluid circuit 1 and a central control unit UC comprising at least one calculator, a memory and a computer program stored in the memory and configured to implement a method 2
- the refrigerant fluid circuit 1 forms a closed circuit in which a refrigerant fluid FR can circulate.
- the refrigerant circuit 1 is sealed when it is in a nominal operating state, that is to say without defects or leaks.
- the thermal conditioning system SCT comprises a flow of a first heat transfer fluid FC1 passing through a first heat exchanger of the fluid circuit 1 refrigerant FR, as well as a second flow of heat transfer fluid FC2 passing through a second heat exchanger of said circuit.
- These heat transfer fluids can be, for example, air or heat transfer liquid.
- Figure 1 illustrates by way of example a first circuit 1 of refrigerant fluid capable of operating for example in a mode making it possible to air-condition a passenger compartment of a vehicle or to cool a battery.
- the refrigerant fluid circuit 1 to which the method 2 according to the invention is applied is a closed circuit forming a loop in which the components of the refrigerant fluid circuit 1 are crossed in series by the refrigerant fluid FR.
- the refrigerant fluid circuit 1 comprises a compression device 3 for the refrigerant fluid FR, a first heat exchanger 4 arranged to be crossed by a flow of first heat transfer fluid FC1 and intended to condense the refrigerant fluid FR, a second exchanger heat exchanger 5 arranged to be crossed by a flow of second heat transfer fluid FC2 and intended to evaporate the refrigerant fluid FR, an expansion member 6 with variable section disposed between the first heat exchanger 4 and the second heat exchanger 5, a device accumulation 7 of the refrigerant fluid FR disposed between the first heat exchanger 4 and the compression device 3.
- the compression device 3 takes for example the form of an electric compressor, that is to say a compressor which comprises a compression mechanism, an electric motor and an electrical control and conversion unit.
- the compression mechanism of the compression device 3 is rotated by the electric motor, the latter being able to be housed inside a compressor housing common to the compression mechanism.
- the compression device 3 of the refrigerant fluid FR has an inlet 8 and an outlet 9.
- the refrigerant fluid circuit 1 comprises a conduit A which connects the outlet 9 of the compression device 3 to the inlet of the first heat exchanger 4.
- conduit A comprises a pressure sensor HP1.
- This pressure sensor HP1 is configured to come into contact with the refrigerant fluid FR leaving the compression device 3.
- the first heat exchanger 4 is crossed by a flow of first heat transfer fluid FC1 capturing the heat of the refrigerant fluid FR passing through said first heat exchanger 4.
- the first heat exchanger 4 is for example a condenser placed on the front panel of the vehicle.
- the thermal conditioning system SCT comprises a temperature sensor T1, dedicated to measuring the temperature of said flow of first heat transfer fluid FC1 upstream of the first heat exchanger 4 from the point of view of the flow of said first heat transfer fluid. In the case where the first heat exchanger 4 is a condenser placed on the front of the vehicle, this flow of first heat transfer fluid FC1 is a flow of external air passing through the first heat exchanger 4.
- the refrigerant fluid circuit 1 comprises a conduit B which connects the outlet of the first heat exchanger 4 to the inlet of the expansion member 6.
- the expansion member 6 has a variable section.
- conduit B comprises a temperature sensor T2.
- This temperature sensor T2 is configured to come into contact with the refrigerant fluid FR leaving the first heat exchanger 4.
- the refrigerant fluid circuit 1 comprises a conduit C which connects the outlet of the expansion member 6 to the inlet of the second heat exchanger 5.
- the second heat exchanger 5 is crossed by a flow of second heat transfer fluid FC2 giving up its heat to the refrigerant fluid FR passing through said second heat exchanger 5.
- the second heat exchanger 5 is for example an evaporator arranged in the housing of 'a non-represented ventilation, heating and/or air conditioning installation (commonly called “HVAC”) of which it is a part.
- the thermal conditioning system SCT comprises a temperature sensor T3, dedicated to measuring the temperature of said flow of second heat transfer fluid FC2 downstream of the second heat exchanger 5 from the point of view of the flow of said second heat transfer fluid FC2.
- This flow is for example an interior air flow intended to be cooled by passing through the second heat exchanger 5 which is then an evaporator placed in the housing of a ventilation, heating and/or air conditioning installation not shown (“ HVAC”) of which it is a part.
- the interior air flow is circulated in the housing using a device for moving the interior air flow.
- the device for setting the interior air flow in motion is for example a propeller rotated by an electric motor.
- Circuit 1 includes a conduit D which connects the outlet of the second heat exchanger 5 to the inlet of the refrigerant fluid accumulation device 7 FR.
- Circuit 1 comprises a conduit E which connects the outlet of the accumulation device 7 of refrigerant fluid FR to the inlet 8 of the compression device 3 of the refrigerant fluid FR.
- the thermal conditioning system SCT comprises electrical cables 10 connecting the central control unit UC intended to implement method 2 according to the invention, to different components of said thermal conditioning system SCT.
- the central control unit UC is thus connected to the pressure sensor HP1 downstream of the compression device 3, to the temperature sensor T 1 of the first heat transfer fluid FC1 upstream of the first heat exchanger 4, to the temperature sensor T2 of the fluid refrigerant FR at the outlet of the heat exchanger 4, and to the temperature sensor T3 of the second heat transfer fluid FC2 downstream of the second heat exchanger 5.
- Method 2 is applicable within a heat transfer fluid cooling mode and/or within a heat transfer fluid heating mode according to the mode being executed by the program configured to implement said method, with steps of said method 2 adapted to said mode.
- Method 2 carries out a first comparison between a value of a quantity representative of a high pressure HP of the refrigerant fluid FR at the outlet of the compression device 3 and a maximum threshold value of pressure HPmax .
- Said method 2 carries out a second comparison between a value of a first temperature Tsfc2 of the second heat transfer fluid FC2 downstream of the heat exchanger 5 and a cooling setpoint temperature value Tsfc2c.
- Said method carries out a third comparison between the speed Ncpr of the compression device 3 and a maximum threshold value of speed Ncpr max of the compression device 3 recorded in the memory of the central control unit UC and depending on the ambient conditions.
- Method 2 checks whether the result of these comparisons corresponds to certain conditions for switching to a mode of maximizing thermal power.
- the thermal power maximization mode is a mode for maximizing the cooling power when the program configured to implement method 2 executes method 2 in a heat transfer fluid cooling mode.
- the thermal power maximization mode is a heating power maximization mode when the program configured to implement method 2 executes method 2 in a heat transfer fluid heating mode.
- Said thermal power being in this example a cooling power of the second heat transfer fluid FC2 in the second heat exchanger 5.
- Said passage conditions including at least. the magnitude value representative of the high pressure HP of the refrigerant fluid FR is equal to or greater than the maximum threshold value of pressure HPmax;
- the first temperature value T sfc2 is strictly greater than the cooling setpoint temperature value Tsfc2c +a, with a being a constant whose value is between 0.2°C and 1°C;
- method 2 carries out a step of opening the opening degree DO of the expansion member and a step of increasing the speed of Ncpr of the compression device 3.
- the implementation of method 2 makes it possible to regulate the thermodynamic cycle of circuit 1 by adjusting the expansion of the refrigerant fluid FR, expansion carried out by the expansion member 6.
- An adapted expansion makes it possible to reach the high pressure HP equal to a pressure setpoint value HPc at the outlet of the compression device 3, said pressure setpoint value HPc being less than or equal to the maximum pressure threshold value HPmax which represents for example the maximum use value authorized at the outlet of the compression device 3 by the central control unit UC.
- This adjustment of the opening by the expansion member 6 will make it possible to maximize the cooling power achievable by allowing the compression device to increase its speed Ncpr while respecting the maximum authorized pressure threshold value HPmax.
- high pressure we mean the pressure level of the refrigerant fluid FR located between the outlet 9 of the compression device 3 and the inlet of the expansion member 6.
- low pressure we mean the pressure level of the refrigerant fluid FR located between the outlet of the expansion member 6 and the inlet 8 of the compression device 3.
- This high pressure HP is measured at the pressure sensor HP1 within the conduit A at the outlet of the compression device 3. Alternatively it is measured via a pressure sensor not shown placed at the outlet of the first exchanger heat 4.
- An output signal from said pressure sensor HP1 is the value of the quantity representative of the high pressure HP.
- control unit UC controls the opening degree DO of the expansion member 6 also controls the speed of the compression device 3, and receives the data obtained by all of said pressure and temperature sensors HP1, T1, T2, and T3, and receives the data received by the expansion member 6 and by the compression device 3 following these instructions.
- the central control unit UC is in this example capable of converting the value of the quantity representative of the high pressure HP of refrigerant fluid FR measured into a datum of a value of a second temperature Te of condensation of the fluid refrigerant FR.
- the value of the second temperature Te is directly measured by a temperature sensor not shown integrated into the first heat exchanger 4.
- the refrigerant fluid FR leaving the compression device 3 via the outlet 9 of said compression device passes through the conduit A and then passes through the first heat exchanger 4.
- the first heat exchanger 4 operates as a condenser. It is simultaneously crossed by the flow of first heat transfer fluid FC1 and by the refrigerant fluid FR at high pressure and high temperature.
- Said flow of first heat transfer fluid FC1 can for example be a flow of air outside the vehicle. The outside air flow absorbs the calories from the FR refrigerant fluid.
- a third temperature Te of the exterior air flow is measured by the temperature sensor T 1 on the front of the vehicle.
- the central control unit UC receives the signal(s) sent by said temperature sensor T 1.
- the refrigerant fluid FR leaving the first heat exchanger 4 passes through the conduit B before entering the expansion member 6.
- the expansion member 6 operates an expansion of the refrigerant fluid FR. To do this, it adopts a partial opening of its internal section corresponding to a given opening degree DO. Any change in the degree of opening DO of the internal section of the expansion member 6 impacts the state of the refrigerant fluid FR on the entire refrigerant fluid circuit FR.
- This degree of opening DO is defined by method 2 as will be described for Figures 2, 3, 6 and 7.
- the instructions relating to this degree of opening DO are transmitted to the expansion member 6 via the cables electrical 10 connecting it to the central control unit UC.
- the refrigerant fluid FR goes from high pressure to low pressure.
- said method 2 controls the opening degree DO of the expansion member 6 to reach a set pressure HPc of the refrigerant fluid FR at the outlet of the compression device 3.
- the low pressure refrigerant fluid FR leaving the expansion member 6 passes through the conduit C and then passes through the second heat exchanger 5.
- the second heat exchanger 5 operates as an evaporator. It cools the flow of second heat transfer fluid FC2 thanks to the refrigerant fluid FR with which a heat exchange takes place.
- This flow is for example an interior air flow intended to be cooled by passing through the second heat exchanger 5 which is for example an evaporator placed in the housing of a ventilation, heating and/or air conditioning installation not shown ( “HVAC”) of which it is a part.
- HVAC ventilation, heating and/or air conditioning
- Figure 2 is a flowchart illustrating the steps of method 2 according to a first aspect of the invention leading to a mode of maximizing the cooling power of the second heat transfer fluid FC2 in the second heat exchanger 5.
- Method 2 is implemented following measurements taken at different points of circuit 1 of refrigerant fluid FR.
- the central control unit UC receives the data from the sensors following these measurements, and gives, for example, instructions relating to these measurements.
- the pressure sensor HP1 measures the high pressure HP of the refrigerant fluid at the outlet of the compression device 3. An output signal from said sensor HP1 is said value of the quantity representative of the high pressure HP at the outlet of the compression device 3 Said signal is sent to the central control unit UC.
- the central control unit UC is able to convert the value of the quantity representative of the high pressure HP of the refrigerant fluid FR measured into the value data of the second condensation temperature Te of the refrigerant fluid FR.
- the thermal conditioning system SCT comprises a sensor (not shown) which measures the second condensation temperature Te of the refrigerant fluid FR in the first heat exchanger 4. An output signal from said sensor is said value of the second condensation temperature Te in the first heat exchanger 4. Said signal is sent to the central control unit UC via cables 10.
- the temperature sensor T1 measures the third temperature Te of the first heat transfer fluid FC1 upstream of the first heat exchanger 4.
- the first heat transfer fluid FC1 is air.
- An output signal from said temperature sensor T 1 is said value of the third temperature Te of the air upstream of the first heat exchanger 4. Said signal is sent to the central control unit UC via cables 10.
- the temperature sensor T2 measures a fourth temperature Tscd of the refrigerant fluid FR at the outlet of the first heat exchanger 4.
- An output signal from said sensor T2 is said value of the fourth temperature Tscd at the outlet of the first heat exchanger 4. Said signal is sent to the central control unit UC via cables 10.
- the temperature sensor T3 measures the first temperature Tsfc2 of the second heat transfer fluid FC2 downstream of the second heat exchanger 5.
- the second heat transfer fluid FC2 is air.
- An output signal from said temperature sensor T3 is said value of the first temperature Tsfc2 of the air downstream of the second heat exchanger 5. Said signal is sent to the central control unit UC via cables 10.
- Method 2 includes a maintenance step E0 which maintains the current speed Ncpr of the compression device 3 and the current opening degree DO of the expansion member 6.
- Method 2 comprises a step E1 of determining the value of the quantity representative of the high pressure HP at the outlet of the compression device 3.
- Method 2 includes a step E2 of comparison between the value of the quantity representative of the high pressure HP and the maximum threshold value of pressure HPmax recorded in the memory of the central control unit UC.
- step E2 of comparison between the value of the quantity representative of the high pressure HP and the maximum threshold value of pressure HPmax showing the value of the quantity representative of the high pressure HP equal or greater at the maximum pressure threshold value HPmax leads to the following preliminary steps to a possible transition to cooling power maximization mode: • a step E3 of determining the value of the first temperature Tsfc2 of the air downstream of the second heat exchanger 5;
- Method 2 comprises a step E7 of calculating a minimum threshold subcooling Tsb_min of the refrigerant fluid FR at the outlet of the first heat exchanger 4.
- Method 2 comprises a step E8 of calculating the subcooling Tsb of the refrigerant fluid FR at the outlet of the first heat exchanger 4.
- Steps E7 of calculating a minimum threshold subcooling Tsb_min of the refrigerant fluid FR and E8 of calculating the subcooling Tsb of the refrigerant fluid FR are carried out without preferential order.
- Method 2 comprises a step E9 of comparison between the value of the first temperature Tsfc2 of the air downstream of the second heat exchanger 5 and the cooling setpoint temperature value Tsfc2c recorded in the unit's memory central control unit CPU.
- a result of the comparison of step E9 of comparison between the value of the first temperature Tsfc2 of the air downstream of the second heat exchanger 5 and the cooling setpoint temperature value Tsfc2c showing the value of the first temperature Tsfc2 between the cooling setpoint temperature value Tsfc2c - a and the cooling setpoint temperature value Tsfc2c + a causes the passage to the maintenance step EO, with a which is a constant having preferably a value included between 0.2°C and 1°C.
- a result of the comparison of step E9 of comparison between the value of the first temperature Tsfc2 of the air downstream of the second heat exchanger 5 and the cooling set temperature value Tsfc2c showing the value of first temperature Tsfc2 strictly greater than the cooling setpoint temperature value Tsfc2c + a is a necessary condition for moving to a step E12 of increasing the opening degree DO of the expansion member 6.
- Method 2 comprises a step E10 of comparison between the subcooling value Tsb and the minimum subcooling threshold value Tsb_min.
- step E10 of comparison between the subcooling value Tsb and the minimum subcooling threshold value Tsb_min showing that said subcooling value Tsb is less than or equal to the threshold value minimum subcooling Tsb_min results in the EO hold step.
- a result of the comparison of step E10 of comparison between the sub-cooling value Tsb and the minimum sub-cooling threshold value Tsb_min showing the sub-cooling value Tsb strictly greater than the minimum threshold value of sub-cooling -cooling Tsb_min is a necessary condition for moving to a step E12 of increasing the opening degree DO of the expansion member 6.
- Method 2 comprises a step E11 of comparison between the speed Ncpr of the compression device 3 and the maximum speed threshold value Ncpr max.
- step E11 of comparison between the speed Ncpr of the compression device and the maximum speed threshold value Ncpr max showing the speed Ncpr equal to the maximum speed threshold value Ncpr max results in the transition to the EO maintenance stage.
- a result of the comparison of step E11 of comparison between the speed Ncpr of the compression device and the maximum threshold value of speed Ncpr max showing a speed Ncpr strictly less than Ncpr max is a necessary condition for moving to a step E12 of increasing the opening degree DO of the expansion member 6.
- Step E9 of comparison between the value of the first temperature Tsfc2 of the air downstream of the second heat exchanger 5 and the cooling set temperature value Tsfc2c, step E10 of comparison between the value of subcooling Tsb and the minimum threshold value of subcooling Tsb_min and step E1 1 of comparison between the speed Ncpr of the compression device and the maximum threshold value of speed Ncpr max are carried out without preferential order.
- step E1 1 of comparison between the speed Ncpr of the compression device 3 and the maximum speed threshold value Ncpr max shows a speed Ncpr strictly lower than Ncpr max.
- step E9 of comparison between the value of the first temperature Tsfc2 of the air downstream of the second heat exchanger 5 and the value of the cooling set temperature T sfc2c shows the value of first temperature Tsfc2 strictly greater than the cooling setpoint temperature value Tsfc2c + a, a being a constant between 0.2°C and 1°C.
- step E10 of comparison between the subcooling value Tsb and the minimum subcooling threshold value Tsb_min shows the subcooling value Tsb strictly greater than the minimum threshold value of subcooling. -cooling Tsb_min.
- Step E12 of increasing the opening degree DO of the expansion member 6 is a step in which the opening degree DO is controlled by the central control unit UC aiming to obtain the value of the quantity representative of the high pressure HP equal to the pressure set value HPc thanks to said increase in the opening degree DO.
- Said HPc pressure setpoint value being recorded in the memory of the control unit and whose value is less than or equal to the maximum HPmax pressure threshold value.
- step E12 of increasing the degree of opening DO of the expansion member 6 comprises a step E13 of increasing the speed Ncpr of the compression device 3 in which the unit central control CPU increases the speed Ncpr of the compression device 3 so that the value of the first temperature Tsfc2 downstream of the second heat exchanger 5 is between the set temperature value Tsfc2c - a and the set temperature value Tsfc2c + a, a being a constant between 0.2°C and 1°C.
- the control unit UC increases the speed Ncpr of the compression device 3 when the value of the first temperature Tsfc2 downstream of the second heat exchanger 5 is greater than the cooling set temperature value Tsfc2c + a, and controls the reduction of the speed Ncpr of the compression device 3 when the value of the first temperature Tsfc2 downstream of the second heat exchanger 5 is less than the cooling setpoint temperature value Tsfc2c - a.
- Figure 3 is a flowchart illustrating the steps of method 2 according to a second aspect of the invention leading to a mode of optimizing the consumption of the compression device 3, in an operation of circuit 1 dedicated to cooling the second heat transfer fluid FC2.
- Method 2 comprises step E1 of determining the value of the quantity representative of the high pressure HP at the outlet of the compression device 3.
- Method 2 comprises step E2 of comparison between the value of the quantity representative of the high pressure HP and the maximum threshold value of pressure HPmax recorded in the memory of the central control unit UC.
- step E2 of comparison between the value of the quantity representative of the high pressure HP and the maximum threshold value of pressure HPmax showing that the value of the quantity representative of the high pressure HP is lower at the maximum pressure threshold value HPmax leads to the following steps preliminary to the mode of optimizing the consumption of the compression device 3: step E3 of determining the value of the first temperature Tsfc2 of the air downstream of the second exchanger heat 5; • step E4 of determining the value of the second condensation temperature Te of the refrigerant fluid in the first heat exchanger 4 from the value of the quantity representative of the high pressure HP of the refrigerant fluid FR;
- step E5 of determining the value of the third temperature Te of the air upstream of the first heat exchanger 4;
- step E6 of determining the value of the fourth temperature Tscd of the refrigerant fluid FR at the outlet of the first heat exchanger 4.
- Method 2 comprises a step E15 of controlling the speed Ncpr of the compression device 3 in which the central control unit UC controls the speed Ncpr of the compression device 3 so that the first temperature value Tsfc2 of the air downstream of the second heat exchanger 5 is between the value of the cooling set temperature Tsfc2c - a and the value of the cooling set temperature Tsfc2c + a.
- the control unit UC increases the speed Ncpr of the compression device 3 when the value of the first temperature Tsfc2 of the air downstream of the second heat exchanger 5 is greater than the cooling setpoint temperature value Tsfc2c + a, and controls the reduction of the speed Ncpr of the compression device 3 when the value of the first temperature Tsfc2 of the air downstream of the second heat exchanger 5 is lower than the cooling setpoint temperature value Tsfc2c - a.
- Method 2 comprises a step E7' of calculating a set point sub-cooling Tsbc of the refrigerant fluid FR at the outlet of the first heat exchanger 4.
- Method 2 comprises step E8 of calculating the subcooling Tsb of the refrigerant fluid FR at the outlet of the first heat exchanger 4.
- Step E7' of calculating a target subcooling T sbc of the refrigerant fluid FR and step E8 of calculating the subcooling Tsb of the refrigerant fluid FR are carried out without preferential order.
- Method 2 comprises a step E14 of controlling the degree of opening DO of the expansion member 6 allowing regulation of the subcooling Tsb at the outlet of the first heat exchanger 4 in which the central control unit UC controls the degree of opening DO of the expansion member 6 so that the subcooling value T sb is between the set subcooling value T sbc - p and the subcooling value of setpoint Tsbc + p, with p being a constant whose value is preferably between 0.2 °C and 1 °C.
- the central control unit UC controls the increase in the opening degree DO of the expansion member 6 when the subcooling value Tsb is greater than the set subcooling value Tsbc + p, and controls the reduction in the opening degree DO when the subcooling value Tsb is lower than the subcooling setpoint value Tsbc - p.
- Figure 4 illustrates, by way of example, a second circuit 1a of refrigerant fluid in which the expansion member 6 and the compression device 3 are controlled according to the steps of the method 2 described in Figures 2 and 3.
- Said second refrigerant fluid circuit 1a differs from the first refrigerant fluid circuit 1 illustrated in Figure 1 in that it includes an additional branch.
- Said branch comprises a sixth conduit F, a second expansion member 11, a seventh conduit G, a third heat exchanger 12 and an eighth conduit H.
- Conduit B of the second circuit 1a comprises a separation point 13 located between the outlet of the first heat exchanger 4 and the inlet of the first expansion member 6.
- conduit F connects the separation point 13 to the inlet of the second expansion member 11.
- the conduit G connects the outlet of the second expansion member 11 to the inlet of the third heat exchanger 12.
- the third heat exchanger 12 is here an evaporator of refrigerant fluid FR crossed by a flow of a third heat transfer fluid FC3 giving up its heat to the refrigerant fluid FR passing through said exchanger 12.
- the third heat exchanger 12 is for example a evaporator located in the environment under the hood which cools a heat transfer liquid intended to cool a vehicle battery.
- the conduit D of the second circuit 1 a comprises a junction point 14 located between the outlet of the second heat exchanger 5 and the inlet of the accumulation device 7 of refrigerant fluid FR.
- the conduit H connects the outlet of the third heat exchanger 12 to the junction point 14.
- the second circuit 1a comprises a temperature sensor T4 for measuring a fifth temperature Tsfc3 of the third heat transfer fluid FC3 downstream of the third heat exchanger 12 from the point of view of the flow of heat transfer fluid FC3.
- the third heat transfer fluid FC3 is heat transfer liquid.
- An output signal from said temperature sensor T4 is said fifth temperature value Tsfc3 of the third heat transfer fluid FC3 downstream of the third heat exchanger 12. Said signal is sent to the central control unit UC via cables 10.
- the flow of refrigerant fluid FR takes all or part of the conduit B to the inlet of the first expansion member 6.
- the part flow of refrigerant fluid FR not going towards the inlet of the first expansion member 6 takes the conduit F to the inlet of the second expansion member 1 1.
- the degree of opening DO of the first expansion member 6 and a degree DO' of opening of the second expansion member 1 1 condition the quantity of flow of refrigerant fluid FR passing through one or the other of the branches of circuit 1 .
- the central control unit UC controls the opening degrees DO and DO' of the first and second expansion members 6 and 11.
- the flow of refrigerant fluid FR undergoes expansion and goes from high pressure to low pressure.
- the part of the refrigerant flow leaving the first expansion member 6 joins the inlet of the second heat exchanger 5 and passes through said second heat exchanger 5 to evaporate by receiving the heat from the heat transfer fluid FC2.
- the flow of heat transfer fluid FC2 is an internal air flow towards the passenger compartment and intended to be cooled through the second heat exchanger 5 which operates as an evaporator.
- the part of the refrigerant fluid flow FR leaving the second expansion member 11 joins the inlet of the third heat exchanger 12 and passes through said third heat exchanger 12 to evaporate while receiving the heat from the heat transfer fluid FC3.
- the heat transfer fluid flow FC3 is a heat transfer liquid flow intended to cool a vehicle battery.
- the flow of refrigerant fluid FR leaving the third heat exchanger 12 joins the junction point 14 via the conduit H.
- the flow of refrigerant fluid FR leaving the second heat exchanger 5 joins the junction point 14 via the portion of conduit D connecting the exit of the second interchange heat 5 and the junction point 14.
- the entire flow of refrigerant fluid FR then joins the inlet of the accumulation device 7 from the junction point 14.
- the steps of method 2 described previously concerning the signal of the value of the first temperature Tsfc2 and concerning the expansion member 6 are also respectively applicable to the signal of the value of the fifth temperature Tsfc3 and the trigger member 1 1.
- the choice of controlling the first expansion member 6 or the second expansion member 1 1 according to the method 2 will depend on the choice of the objective of maximizing the cooling power between the flow of second heat transfer fluid FC2 in the second exchanger 5 and the flow of third heat transfer fluid FC3 in the third heat exchanger 12.
- the conduit F comprises the temperature sensor T2 for measuring the fourth temperature Tscd of the refrigerant fluid FR.
- Figure 5 illustrates, by way of example, a third circuit 1 b of refrigerant fluid FR in which the expansion member 6 and the compression device 3 are controlled according to the steps of the method 2 described in Figures 2 and 3.
- This third circuit 1 b of refrigerant fluid FR differs from the first circuit 1 of Figure 1 in that:
- the portion of the circuit between the outlet of the first heat exchanger 4 and the inlet of the second heat exchanger 5 includes additional components
- the refrigerant fluid accumulation device 7 FR is no longer positioned between the outlet of the second heat exchanger 5 and the inlet of the compression device 3 but positioned between the outlet of the first heat exchanger 4 and the inlet of the second heat exchanger 5.
- the third circuit 1 b comprises a conduit B’ connecting the output of the first expansion member 6 to the inlet of the accumulation device 7.
- the third circuit 1 b comprises a conduit B” connecting the output of the accumulation device 7 to the input of a third expansion member 15.
- Conduit C of the third circuit 1 b connects the outlet of the third expansion member 15 to the inlet of the second heat exchanger 5.
- Conduit D of the third circuit 1 b connects the outlet of the second heat exchanger 5 to the inlet 8 of the compression device 3.
- the conduit D of the third circuit 1 b comprises a temperature sensor T4 dedicated to measuring a sixth temperature Tsev of the refrigerant fluid FR at the outlet of the second heat exchanger 5.
- An output signal from said sensor T4 is said value sixth temperature Tsev of the refrigerant fluid FR at the outlet of the second heat exchanger 5. Said signal is sent to the central control unit UC via cables 10.
- the flow of refrigerant fluid FR leaving the first heat exchanger 4 joins the first expansion member 6 via conduit B and undergoes a first expansion as it passes said first expansion member. expansion 6.
- the pressure level of the refrigerant fluid FR is at an intermediate level between the high pressure HP upstream of the first expansion member 6 and the low pressure downstream of the third expansion member 15.
- the flow of refrigerant fluid FR then joins the accumulation device 7 of refrigerant fluid FR via conduit B'.
- the flow of refrigerant fluid FR then joins the third expansion member 15 via conduit B” and undergoes a second expansion as it passes said third expansion member 15.
- the flow of low pressure refrigerant fluid at the outlet of the third expansion member 15 joins then the entrance to the second heat exchanger 5 via conduit C.
- the central control unit UC controls the opening degree DO of the first expansion member 6 and an opening degree DO” of the third expansion member 15.
- method 2 comprises a step not shown of regulating an overheating Tsh of refrigerant fluid FR at the outlet of the second heat exchanger 5 by control of the degree of opening DO” of the third expansion member 15.
- the central control unit UC controls the degree of opening DO” of the third expansion member 15 so that the overheating value Tsh is between a set point overheating value Tshc - y and said set point overheating value Tshc + y, with y being a constant whose value is preferably between 0.2°C and 1°C.
- Said setpoint overheating value Tshc is recorded in the memory of the central control unit UC.
- the central control unit UC controls the increase in degree of opening DO” of the third expansion member 15 when the overheating value Tsh is greater than the set superheating value Tshc + y, and controls the reduction of said opening degree DO” when the overheating value Tsh is lower at setpoint superheat value Tshc - y.
- Figure 6 is a flowchart illustrating the steps of method 2 according to a third aspect of the invention leading to a mode of maximizing the heating power of the first heat transfer fluid FC1 in the first heat exchanger 4.
- Said third aspect of the invention differs from the first aspect of the invention illustrated in Figure 2 in that within method 2:
- step E3 of determining the value of the first temperature Tsfc2 of the second heat transfer fluid FC2 downstream of the second heat exchanger 5 is replaced by a step E3' of determining the value of the eighth temperature Tsfcl of the first heat transfer fluid FC1 downstream of the first heat exchanger 4;
- step E9 of comparison between the value of the first temperature T sfc2 of the second heat transfer fluid FC2 downstream of the second heat exchanger 5 and the value of the cooling set temperature Tsfc2c is replaced by a step E9' of comparison between the value of the eighth temperature Tsfcl of the first heat transfer fluid FC1 downstream of the first heat exchanger 4 and a heating setpoint temperature value Tsfdc.
- a result of the comparison of said step E9” of comparison between the value of the eighth temperature Tsfcl of the first heat transfer fluid FC1 downstream of the first heat exchanger 4 and the heating setpoint temperature value Tsfdc showing a value of eighth temperature Tsfcl between the heating setpoint temperature value Tsfd c - a and the heating setpoint temperature value Tsf 1 c + a causes the passage to the maintenance step EO, with a which is a constant having a value preferably included between 0.2°C and 1°C;
- step E12 of increasing the opening degree DO of the expansion member 6 the result of the comparison of said step E9' of comparison between the value of the eighth temperature Tsfcl first heat transfer fluid FC1 downstream of the first heat exchanger 4 and the heating setpoint temperature value Tsfdc shows that the value of the eighth temperature Tsfcl strictly is lower than the heating setpoint temperature value Tsfd c - a;
- step E13 of increasing the speed Ncpr of the compression device 3 is replaced by an alternative step E13' of increasing the speed Ncpr of the compression device 3 in which the central control unit UC increases the speed Ncpr of the compression device 3 so that the value of the eighth temperature Tsfd downstream of the first heat exchanger 4 is between the heating setpoint temperature value Tsfdc - a and the heating setpoint temperature value Tsfd c + a, a being a constant whose value is a value preferably between 0.2°C and 1°C, the control unit UC increasing the speed Ncpr of the compression device 3 when the value of the eighth temperature Tsfd in downstream of the first heat exchanger 4 is lower than the heating setpoint temperature value Tsfdc - a, and reducing the speed Ncpr of the compression device 3 when the value of the eighth temperature Tsfd downstream of the first heat exchanger 4 is greater at the heating setpoint temperature value Tsfcc + a;
- step E16 of increasing a power Pwr of an additional electric heating device 16 in which the central control unit UC increases the power Pwr of the additional electric heating device 16 making it possible to heat the second fluid heat transfer FC2 upstream of the second heat exchanger 5, so that the value of the eighth temperature Tsfd downstream of the first heat exchanger 4 is between the heating setpoint temperature value Tsf c - a and the value of heating setpoint temperature Tsfdc + a, a being a constant whose value is a value preferably between 0.2°C and 1°C, the control unit UC increasing the power Pwr of the additional electric heating device 16 when the value of the eighth temperature Tsfd downstream of the first heat exchanger 4 is lower than the heating setpoint temperature value Tsfdc - a, and reducing the power Pwr of the additional electric heating device 16 when the value of the eighth temperature Tsfd downstream of the first heat exchanger 4 is greater than the heating setpoint temperature value Tsfcc + a.
- Said step E14 of increasing the power Pwr of the additional electric heating device 16 presents a particular interest in reaching the heating setpoint temperature Tsfdc when for example the speed Ncpr of the compression device 3 has already reached the maximum speed threshold value Ncpr max;
- step E1 1 of comparison between the speed Ncpr of the compression device 3 and the maximum speed threshold value Ncpr max is deleted.
- the condition for passing to step E12 of increasing the degree of opening DO of the expansion member 6 depends on a result of said step E11 of comparison between the speed Ncpr of the compression device and the maximum threshold value of Ncpr max speed is therefore deleted;
- step E5 of determining the value of the third temperature Te of first heat transfer fluid FC1 upstream of the first heat exchanger 4 is deleted;
- step E6 of determining the value of the fourth temperature Tscd of the refrigerant fluid FR at the outlet of the first heat exchanger 4 is deleted;
- step E8 of calculating the subcooling Tsb of the refrigerant fluid FR is deleted;
- step E10 of comparison between the subcooling value Tsb and the minimum subcooling threshold value Tsb_min is deleted.
- the condition for passing to step E12 of increasing the degree of opening DO of the expansion member 6 depends on a result of said step E10 of comparison between the subcooling value Tsb and the minimum threshold value of subcooling Tsb_min is deleted.
- the flow of first heat transfer fluid FC1 is an internal air flow towards the passenger compartment and intended to be heated through the first heat exchanger 4 which works as an internal condenser placed in the housing of a ventilation, heating and/or air conditioning (“HVAC”) installation not shown of which it is a part.
- HVAC ventilation, heating and/or air conditioning
- Figure 7 is a flowchart illustrating the steps of method 2 according to a fourth aspect of the invention, leading to an alternative mode of optimizing the consumption of the compression device 3, in an operation of circuit 1 dedicated to heating of the first heat transfer fluid FC1.
- step E3 of determining the value of the first temperature Tsfc2 of the second heat transfer fluid downstream of the second heat exchanger 5 is replaced by step E3' of determining the value of the eighth temperature Tsfcl of the first heat transfer fluid FC1 downstream of the first heat exchanger 4;
- step E15 of controlling the speed Ncpr of the compression device 3 is replaced by the alternative step E15' of controlling the speed Ncpr of the compression device 3 in which the central control unit UC controls the speed Ncpr of the compression device 3 so that the eighth temperature value Tsfcl of the first heat transfer fluid FC1 downstream of the first heat exchanger 4 is between the heating setpoint temperature value Tsfcl c - a and the setpoint temperature value heating Tsfd c + a, a being a constant preferably between 0.2°C and 1°C;
- step E14 of controlling the degree of opening DO of the expansion member 6 is replaced by an alternative step E14' of controlling the degree of opening DO of the expansion member 6 allowing regulation of the subcooling Tsb at the outlet of the first heat exchanger 4 in which the unit of central control UC controls the opening degree DO of the expansion member 6 so that the subcooling value Tsb is between the second subcooling setpoint value Tsbc2 - p and the second subcooling value -setpoint cooling T sbc2 + p, with p being a constant whose value is preferably between 0.2 °C and 1 °C.
- the central control unit UC controls the increase in the opening degree DO of the expansion member 6 when the sub-cooling value Tsb is greater than the second sub-cooling setpoint value Tsbc2 + p, and controls the reduction in the opening degree DO when the subcooling value Tsb is less than the second subcooling setpoint value Tsbc2 - p.
- Figure 8 illustrates, by way of example, a fourth circuit 1 c of refrigerant fluid FR to which the third aspect and the fourth aspect of method 2 of the invention illustrated in Figures 6 and 7 are applicable.
- the fourth circuit 1c of refrigerant fluid FR differs from the example of first circuit 1 of refrigerant fluid illustrated in Figure 1 in that:
- the fourth circuit 1 c comprises a temperature sensor T5 of the first heat transfer fluid FC1 at the outlet of the first heat exchanger 4 dedicated to measuring the eighth temperature Tsfcl of the first heat transfer fluid FC1 at the outlet of the first heat exchanger 4.
- a signal output of said sensor T5 is said value of the eighth temperature Tsfcl of the first heat transfer fluid FC1 at the outlet of the first heat exchanger 4. Said signal is sent to the central control unit UC via cables 10;
- the fourth circuit 1 c comprises the additional electric heating device 16 heating the second heat transfer fluid FC2 upstream of the second heat exchanger 5.
- the central control unit UC controls the heating power of said additional electric heating device 16 by the cables 10.
- the first heat transfer fluid FC1 is for example an internal air flow intended to be heated by passing through the first heat exchanger 4 which is then an internal condenser arranged in the housing of a non-heated installation. represented by ventilation, heating and/or air conditioning (“HVAC”) of which it is a part.
- HVAC ventilation, heating and/or air conditioning
- the second heat transfer fluid FC2 is for example a heat transfer liquid giving up its heat to the refrigerant fluid FR within the second heat exchanger 5, which is then an evaporator located in the environment under the hood of the vehicle.
- Figure 9 illustrates, by way of example, a fifth circuit 1d of refrigerant fluid FR to which the third aspect and the fourth aspect of method 2 of the invention illustrated in Figures 6 and 7 are applicable.
- the fifth circuit 1d of refrigerant fluid FR differs from the example of first circuit 1 of refrigerant fluid illustrated in Figure 1 in that:
- the fifth circuit 1d comprises the temperature sensor T5 of the first heat transfer fluid FC1 at the outlet of the first heat exchanger 4 dedicated to measuring the eighth temperature Tsfcl of the first heat transfer fluid FC1 at the outlet of the first heat exchanger 4.
- a signal of output of said sensor T5 is said value of the eighth temperature Tsfcl of the first heat transfer fluid FC1 at the outlet of the first heat exchanger 4. Said signal is sent to the central control unit UC via cables 10;
- the fifth circuit 1d comprises the additional electric heating device 16 heating the first heat transfer fluid FC1 upstream of the second heat exchanger 5.
- the central control unit UC controls the heating power of said additional electric heating device 16 via the cables 10.
- the first heat transfer fluid FC1 is for example an interior air flow intended to be heated by passing through the first heat exchanger 4 which is then an internal condenser arranged in the housing of a non-heated installation. represented by ventilation, heating and/or air conditioning (“HVAC”) of which it is a part.
- HVAC ventilation, heating and/or air conditioning
- the second heat transfer fluid FC2 is for example a heat transfer liquid giving up its heat to the refrigerant fluid FR within the second heat exchanger 5, which is then an evaporator located in the environment under the hood of the vehicle.
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- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Air-Conditioning For Vehicles (AREA)
- Compression-Type Refrigeration Machines With Reversible Cycles (AREA)
- Compressors, Vaccum Pumps And Other Relevant Systems (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| FR2300012A FR3144547B1 (fr) | 2023-01-02 | 2023-01-02 | Procédé de contrôle pour la maximisation de la puissance thermique |
| PCT/EP2023/087443 WO2024146832A1 (fr) | 2023-01-02 | 2023-12-21 | Procede de controle pour la maximisation de la puissance thermique |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| EP4646334A1 true EP4646334A1 (fr) | 2025-11-12 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP23837656.0A Pending EP4646334A1 (fr) | 2023-01-02 | 2023-12-21 | Procede de controle pour la maximisation de la puissance thermique |
Country Status (3)
| Country | Link |
|---|---|
| EP (1) | EP4646334A1 (fr) |
| FR (1) | FR3144547B1 (fr) |
| WO (1) | WO2024146832A1 (fr) |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP4758705B2 (ja) * | 2005-08-05 | 2011-08-31 | サンデン株式会社 | 車両用空調装置 |
| US10547184B2 (en) | 2015-02-18 | 2020-01-28 | The Boeing Company | System and method for battery management |
| DE102016001096B4 (de) * | 2016-02-01 | 2023-07-27 | Audi Ag | Verfahren zum Betreiben einer Fahrzeug-Kälteanlage, Fahrzeug-Kälteanlage zur Durchführung des Verfahrens und Fahrzeug mit einer solchen Fahrzeug-Kälteanlage |
| FR3082786B1 (fr) * | 2018-06-26 | 2020-07-03 | Valeo Systemes Thermiques | Procede de controle d’un circuit de fluide refrigerant pour vehicule |
| DE102018210477B4 (de) * | 2018-06-27 | 2021-08-19 | Audi Ag | Verfahren zum Betreiben eines Kältemittelkreislaufs einer Klimaanlage eines Fahrzeugs |
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2023
- 2023-01-02 FR FR2300012A patent/FR3144547B1/fr active Active
- 2023-12-21 EP EP23837656.0A patent/EP4646334A1/fr active Pending
- 2023-12-21 WO PCT/EP2023/087443 patent/WO2024146832A1/fr not_active Ceased
Also Published As
| Publication number | Publication date |
|---|---|
| FR3144547A1 (fr) | 2024-07-05 |
| FR3144547B1 (fr) | 2025-12-05 |
| WO2024146832A1 (fr) | 2024-07-11 |
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