DEVICE FOR MEASURING QUANTITY OF FLOWING MEDIUM

摘要

An apparatus is proposed for measuring the mass of a fluid medium such as the mass of air induced by internal combustion engines which has at least one temperature-dependent measuring resistor film disposed in the flow of the medium, whose temperature and/or resistance is regulated in accordance with the mass of the medium and wherein the manipulated variable is a measure for the mass of the medium. The temperature-dependent measuring resistor film is disposed on a carrier separated therefrom by an insulating film and a temperature-dependent heating resistor film. The temperature of the heating resistor film is regulated to approximately the same temperature as the temperature-dependent measuring resistor film so that a heat flow between the temperature-dependent measuring resistor and the carrier is prevented. As a result, the response speed of the apparatus to changes in the flow rate of the medium is substantially improved as is the precision of measurement.