In the paper the method of individual gas analysis of vehicles with using promising means, including an oscilloscope and an electronically controlled load device, is considered. During the research, the lower and upper limits of the variation of the variable toxicity parameters for modern gasoline cars, regardless of the number of cylinders, are theoretically justified. This generalized theoretical model can be used by machine-building plants and car service enterprises to assess the current state of catalytic converters, spark plugs, electromagnetic injectors, as well as forecasting the resource for the upcoming use cycles.
The authors have considered typical designs of sensors of mass air flow rate used in motor vehicles and established that the most perfect are film-type sensors. Analysis of modern means and methods for diagnostics of mass air flow rate sensors showed that there are no methods for their nondestructive inspection. The study presented in the paper is based on the use of a developed measuring device for creation of test modes. As controlled parameters the authors have selected a mass air flow rate, voltage from sensor test terminal, a position of the butterfly throttle, hourly consumption of fuel at variation of the ICE crankshaft rotation speed at the position of the butterfly throttle from 0 to 100 %. It is established that the most sensitive parameters are the mass air flow rate and the voltage of the sensor control contact.
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