چكيده به لاتين
Currently, according to research, 70% of the share of pollutants in the city of Tehran belongs to cars. Of these, 45% is for riding cars, and 24% of the ride-in-ride cars in this metropolis are over ten years old. At the same time, an aging car creates pollution by at least 10 times more than a new car. One of the most potent pollutant controllers in the cars is the catalytic converters, which usually have to be replaced after 80,000 kilometers of scrolling, so that they can function properly. But in practice consumers continue to do so regardless of environmental effects. In this research, considering the environmental impacts of continuing the traffic of vehicles with worn-out converters, by using equating environmental damage with financial cost, an economic survey was conducted to determine the appropriate time for replacing these converters with a new converter. To carry out this research, with the fact that 24% of the cars are driving Peugeot 405 and Samand with the XU7 engine, the studies continued with the modeling of the engine in the GT-Power software on the Peugeot 405. For this purpose, the base engine was modeled in three new, semi-worn and worn-out modes to determine torque, power, fuel consumption, and emissions.
It should be noted that when the catalytic converter is worn, in addition to the increase in emissions caused by the weaker converter performance, due to the transducer enclosure, the motor's upper end of the engine is increased to 42% in the fully worn condition and the maximum torque of the engine actually falls to 20% In this case, the driver has to push the gas pedal in order to achieve its optimum speed, resulting in an increase in fuel consumption at an equal speed in a worn-out condition. Therefore, in this study, the motor behavior was modeled in three conditions for different angles of throttle, assuming that the performance of the engine was semi-stable, and then the fuel consumption was calculated to follow the baseline driving cycle in the three above-mentioned conditions. The research showed that the fuel consumption increased by 9 and 12% respectively and the concentration of pollutants was increased by 63% and 75% respectively for the half-worn and fully worn condition. With the adoption of international economic criteria for the economic equilibrium of pollution, it was shown that for the base vehicle, after the fifth year, catalytic converter replacement was economically viable in different scenarios.
