| 摘要 |
1. Method for calibrating a hot wire air mass flowmeter in electronic fuel metering systems, particularly electronic fuel injection systems or controlled carburettors, comprising a hot wire arranged in the intake pipe of an internal combustion engine and an evaluating circuit which evaluates the output signal of the latter and converts it into a digital quantity, characterized in that to the input of an amplifier (11) amplifying the output measurement signal (UH ) of the hot wire air mass flowmeter successively at least two particular analog calibration values are applied, the corresponding digital values of which at the output of the evaluating circuit are known and that a calibration is performed directly with the use of an analog/digital converter (12), following the amplifier (11), including a computer (14), in the operational installed condition of the fuel metering system with the activation of a special test program only by changing resistance values of a resistance network of the input amplifier (11) until the digital values output by the computer (14), for example via an interface, correspond to the known predetermined digital values. |
