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.
The noise of motor vehicles is one of the most important problems as regards to pollution on main roads. However, this unpleasant characteristic could be used to determine vehicle speed by external observers. Building on this idea, the present study investigates the capabilities of a microphone array system to identify the position and velocity of a vehicle travelling on a previously established route. Such linear microphone array has been formed by a reduced number of microphones working at medium frequencies as compared to industrial microphone arrays built for location purposes, and operates with a processing algorithm that ultimately identifies the noise source location and reduces the error in velocity estimation
W pracy porównano skuteczność wybranych metod estymacji prędkości pojazdu w warunkach silnych zakłóceń. Rozpatrzono następujące metody: aproksymacji parabolicznej, funkcji interkorelacji, wygładzania wykładniczego oraz wstępnego uśrednienia sekwencji obrazów. W wyniku przeprowadzonych symulacji komputerowych ustalono, że najlepsze efekty (najmniejszy błąd średniokwadratowy) uzyskano stosując metodę średniej ruchomej oraz wygładzania wykładniczego poprzedzone wstępnym uśrednieniem sekwencji obrazów.
EN
In the paper the efficiency of selected methods of estimating a vehicle velocity in strong random noise conditions was compared. The following methods were examined: parabolic approximation, intercorrelation function, exponential smoothing and initial averaging of an image sequence. As a result of computer simulations it was concluded that the most effective (i.e. yielding the smallest mean squared error) proved the moving average method and exponential smoothing preceded by initial averaging of an image sequence.
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