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The influence of three-way catalytic converter on the car

 The three-way catalytic converter is the most important off-board purification device installed in the exhaust system of automobiles. It converts harmful gases such as CO, HC and NOx emitted from automobile exhaust into harmless carbon dioxide, water and nitrogen through oxidation and reduction. When the high-temperature automobile exhaust passes through the purification device, the purifying agent in the three-way catalytic converter will enhance the activities of the three gases CO, HC and NOx, and cause it to undergo a certain oxidation-reduction chemical reaction, in which CO is oxidized at a high temperature to become Color, non-toxic carbon dioxide gas; HC compounds are oxidized to water (H20) and carbon dioxide at high temperatures; NOx is reduced to nitrogen and oxygen. Three harmful gases become harmless gases, which purify automobile exhaust.

Therefore, the three-way catalytic converter is only to transform the elements of our automobile emissions that are polluting to the natural environment. It is only a purification device and has no effect on the operation of our engine. However, the engine failure light will be bright, and the fuel consumption and engine noise will increase.

 And if the three-way catalytic converter is damaged, this is no way to repair it, it can only be replaced.

The main function of the three-way catalytic converter is to reduce exhaust pollution. Usually there is an oxygen sensor in front of and behind the three-way catalytic converter to sense the oxygen content in the exhaust gas and feed back information to the counter ECU. The ECU computer judges whether the three-way catalytic converter works normally according to the feedback data of the front and rear oxygen sensors, and corrects the air-fuel ratio, increases or decreases the fuel injection amount according to the feedback signal, calculates and adjusts the ignition time, and then controls the normal operation of the engine.

If the three-way catalytic converter is working properly, the oxygen content measured by the two sensors is front high and rear low; If there is no three-way catalytic converter, the oxygen content measured by the front and rear sensors is the same. The ECU compares the data of the oxygen sensor before and after the comparison, and considers that the oxygen content in the exhaust gas is too high, and it is judged that the mixed gas is too thin, thereby controlling the fuel injection system to increase the amount of fuel injection, thereby making the mixture too rich and increasing the fuel consumption of the vehicle.