Method for operating a device for the thermal conditioning of a motor vehicle interior and device for implementing the method

A device for the thermal conditioning of a motor vehicle interior, comprising:

• a refrigerant circuit comprising a compressor and a heat exchanger configured to form an evaporator, the heat exchanger being configured to exchange heat with a flow of air intended to be conditioned;
• at least one bypass means configured to divert from the heat exchanger at least part of said flow of air and configured to be controlled between a closed position, in which no flow is diverted from the heat exchanger, and a plurality of open positions, in which part of the flow is diverted from the heat exchanger on the basis of one of the plurality of open positions;
• a mixing zone for mixing the flow of air that has passed through the evaporator and the flow of air diverted by the bypass means so as to obtain a flow of air at a setpoint temperature;
• and
• a control unit configured to cause the compressor to operate in a cyclical manner having a period of operation in a first state, in which the compressor generates together with the heat exchanger a first quantity of frigories, alternating with a period of operation in a second state, in which the compressor generates together with the heat exchanger a second quantity of frigories lower than the first quantity,
• wherein the control unit is also connected to the bypass means to control the position of the bypass means in a cyclical manner consistent with the first state and second state periods of operation of the compressor.