Flow corrections established based on Lambda control system of spark ignition engines, determines in a decisively way the quality of air-fuel mixture. Faults in the operation of the control system generates deviations of the mixture composition from stoichiometric report, in this way affecting the entire combustion process in engine cylinders. This phenomenon leads, among others, to changes regarding the density of pollutant emissions from exhaust gases. In this context, this paper presents experimental researches made using the simulation of faults that may occur in the control system to highlight their influence on the concentration of engine emissions.
On-board malfunction simulation consists of generating controlled malfunctions by transmitting, through sensor connector, a signal of a certain variation/ wave to the electronic control unit. Thus, the control unit will interpret that the monitored system has a malfunction. The main advantage of this method is that it allows the simulation for a wide range of malfunctions without requiring complex operations when changing from one type of malfunction to another. Also, this method (nondestructive type) exploits the technical potential of on-board diagnosis systems which fit modern vehicles and it allows to use the same devices for all types of simulated malfunctions.
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