Thermal conditioning system for a motor vehicle

A method for controlling a thermal conditioning system,

• the thermal conditioning system comprising a refrigerant circuit configured to circulate a refrigerant, the refrigerant circuit comprising:
• a main loop comprising in succession in the direction of circulation of the refrigerant:
• a compression device,
• a first heat exchanger configured to exchange heat with a first heat transfer fluid,
• a first expansion device,
• a first evaporator configured to exchange heat with an element of a powertrain of a motor vehicle via a second heat transfer fluid, and
• a first bypass branch connecting a first connection point positioned on the main loop downstream of the first heat exchanger and upstream of the first expansion device to a second connection point positioned on the main loop downstream of the first evaporator and upstream of the compression device,
• the first bypass branch comprising a second expansion device and a second heat exchanger configured to exchange heat with an internal air stream internal to a passenger compartment of the motor vehicle,
• wherein the thermal conditioning system is configured to operate in an operating mode referred to as powertrain cooling mode in which the first heat transfer fluid receives heat from the refrigerant and the second heat transfer fluid transfers heat to the refrigerant, and in which a flow of refrigerant through the second heat exchanger is zero,
• the method comprising:
• determining a pressure of the refrigerant at the outlet of the first evaporator,
• controlling, depending on the determined pressure, at least one parameter among the following parameters:
• passage section of the first expansion device,
• passage section of the second expansion device,
• flow of refrigerant supplied by the compression device,
• temperature of the internal air stream,
• so that the pressure of the refrigerant at the outlet of the first evaporator is below a predetermined pressure threshold.