The paper presents the design, description and traction research results concerning the prototype transducer of vehicle velocity installed in FIAT CINQUECENTO 1.1i passenger car. Within the confines of paper the original speedometer installed in the vehicle was calibrated in order to obtain the true values of vehicle velocity. The performed measurements of the transducer were compared with the original speedometer readings and the characteristic of the transducer was prepared. The mechanical part of vehicle velocity transducer, the electronic part of vehicle velocity transducer and traction researches are an object of the paper. Fuel consumption signal processing, the transducer design, the view of the vehicle velocity transducer, electric diagram of the vehicle velocity transducer, the results of the transducer calibration among other things are presented in the paper. The performed research of the prototype electronic transducer prove that it can be successfully used to design and built more advanced transducer dedicated to liquid fuel consumption measurement given in dm3/100 km unit.
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