| 摘要 |
The invention relates to a device for thermal mass flow measurement, particularly for measuring an air mass being supplied to an internal combustion engine, comprising a temperature-dependent electrically heated resistor as a heating element (RH), a temperature-dependent electric resistor as a temperature sensor (RT) for measuring the temperature of the mass flow, and two fixed resistors (R2, R3), wherein the heating element (RH), the temperature sensor (RT), and the fixed resistors (R2, R3) are connected in a Wheatstone bridge, a further fixed resistor (R1) is connected in series to the temperature sensor (RT), the heating element (RH) and the temperature sensor (RT) are in thermal contact with the flowing medium, the temperature sensor (RT) and the fixed resistor (R1) are tuned to fit with the heating element (RH), and the temperature coefficient of the resistor (R1) is less than the temperature coefficient of the temperature sensor (RT). |
