Method for transporting heat-sensitive products in a refrigerated lorry, of the type where the lorry is provided with: - at least one storage chamber for products, - a reserve of a cryogenic fluid such as liquid nitrogen, - a heat exchanger system internal to said at least one chamber, wherein flows the cryogenic fluid, - an air circulation system, for example of the fan type, able to place the air inside the chamber in contact with the cold walls of the heat exchanger system, - temperature sensors able to determine the temperature of the atmosphere internal to said at least one chamber (T int) on the one hand and that of the cold vapours exiting from all or a portion of the exchangers of the system on the other hand (T fluid outflow), - as well as a management and control unit, able to regulate the internal temperature T int at a set value T cons by ordering a closing or opening, or the degree of such an opening/closing, of a valve or valves supplying the exchanger system with cryogenic fluid, the magnitude ΔT = T int - T cons is determined in real time; characterised in that the temperature T int is regulated by implementing the following measurements: - the value of the Pinch of the exchanger system is determined in real time where: Pinch = T int − T fluid outflow; - a parameter P is taken into account which is a function of ΔT, and the management and control unit orders, as long as the Pinch is less than or equal to the parameter P, the maintaining in open position or the increase of the opening of the valve or of the valves used to supply the exchanger system with cryogenic fluid. - at least one storage chamber for products, - a reserve of a cryogenic fluid such as liquid nitrogen, - a heat exchanger system internal to said at least one chamber, wherein flows the cryogenic fluid, - an air circulation system, for example of the fan type, able to place the air inside the chamber in contact with the cold walls of the heat exchanger system, - temperature sensors able to determine the temperature of the atmosphere internal to said at least one chamber (T int) on the one hand and that of the cold vapours exiting from all or a portion of the exchangers of the system on the other hand (T fluid outflow), - as well as a management and control unit, able to regulate the internal temperature T int at a set value T cons by ordering a closing or opening, or the degree of such an opening/closing, of a valve or valves supplying the exchanger system with cryogenic fluid, the magnitude ΔT = T int - T cons is determined in real time; characterised in that the temperature T int is regulated by implementing the following measurements: - the value of the Pinch of the exchanger system is determined in real time where: Pinch = T int − T fluid outflow; - a parameter P is taken into account which is a function of ΔT, and the management and control unit orders, as long as the Pinch is less than or equal to the parameter P, the maintaining in open position or the increase of the opening of the valve or of the valves used to supply the exchanger system with cryogenic fluid. - the value of the Pinch of the exchanger system is determined in real time where: Pinch = T int − T fluid outflow; - a parameter P is taken into account which is a function of ΔT, and the management and control unit orders, as long as the Pinch is less than or equal to the parameter P, the maintaining in open position or the increase of the opening of the valve or of the valves used to supply the exchanger system with cryogenic fluid.