Patent ID: 6796137
Filing Date: 2004-09-28
Classification: B60H

Abstract:
Air conditioning system for motor vehicles which is fitted with an injection computer and with a refrigerant fluid circuit comprising a compressor, a cooling member, an expansion member and an evaporator, together with an electronic control device intended to interact with the refrigerant fluid circuit and the injection computer, and which comprises:a first measuring member suitable for supplying a value relating to the fluid pressure at a first point in the air conditioning circuit, termed the first pressure, said first point being situated between the outlet of the expansion member and the outlet of the evaporator, a second measuring member suitable for supplying a value relating to the fluid pressure at a second point in the air conditioning circuit, termed the second pressure, said second point being situated at the inlet to the compressor, and wherein the electronic control device is able to make use of the solution of an equation which relates the mass flow rate of the refrigerant fluid to the difference in pressure between the first point and the second point in order to calculate an estimate of a magnitude relating to the refrigerant fluid.