| 摘要 |
An apparatus (11) for indicating the fuel level in a vehicle tank, comprising an electrical level transducer (Rx) located in the tank, an indicator device (S) controlled by an electrical voltage and an electronic circuit (12), the subject of the present invention, comprising an input towards the transducer and an output towards the indicator device, in which the electronic circuit (12) comprises static switches (Int-1, Int-2) controlled by a square wave generator with an ON period which is short relative to its OFF period, to alternately enable and disenable the connection of a resistive-capacitive network (RC) between the input and output. Said network operates as a filter for the variations produced by the float, whereas the switches on the one hand produce a real increase in the filter time constant (equal approximately to the ratio of the OFF time to the ON time) and on the other hand ensure when under stationary conditions that the measurement corresponds exactly to a direct instrument-float connection. <IMAGE> |
