Three catalytic converter is the carrier of porous ceramic materials, itself does not participate in the catalytic reaction, but the internal covering of a layer of platinum, rhodium, palladium and other precious metals is the main material of catalytic pollutants.Because of these rare precious metals, the replacement cost of three catalytic converters is thousands of yuan or even tens of thousands of yuan.Therefore, reducing the failure rate of three is the premise of qualified exhaust gas, and it can also reduce the cost of using a car.

The oxidation and reduction function of three catalytic converters begin to play a role at 250 DEG C, and the best working temperature is 400 DEG C to 800 DEG C, which is derived from the exhaust temperature of the engine. In winter, the harmful substances in the exhaust gas will increase, so the engine preheating is a must when the temperature is low.When the temperature exceeds 1000 DEG C, the high temperature will ablate the catalytic coating inside the three yuan, making the three yuan lose the purification function. Therefore, the maintenance of the engine cooling system is also very important for the service life of three yuan.

Now the engine is using a closed loop control system, which can control the air-fuel ratio more accurately and achieve better fuel economy. But it is easier to generate the sediment after combustion, that is, the carbon deposition of various parts of the engine. The carbon deposition problem is also a common problem affecting the normal work of three catalytic converters. So the daily use of the vehicle should be to the regular gas station to use unleaded fuel, add regular fuel additives and lubricating protective agent, so as to reduce the sulfur, phosphorus, lead and other substances pollution three internal catalytic device, reduce the conversion rate of three or make the toxic.

In addition, the use of low ash oil is also an effective way to reduce the formation of carbon deposits.When it comes to the closed-loop control of the engine, it can not be separated from the oxygen sensor, which will pass the oxygen concentration in the exhaust gas to the ECU, and the ECU will adjust the fuel injection according to the feedback to achieve the ideal air-fuel ratio. That is to say, the quality of the oxygen sensor will affect the exhaust emissions, the excessive exhaust emissions can indicate that the three-way catalyst has been saturated internally and can not complete the excess purification work.In addition, the voltage value of the oxygen sensor before and after reading, if the voltage value is consistent, there is a problem with the three.In addition, the oxygen sensor will work normally at 300 °C above, and 800 °C is the fastest reaction time, so again emphasize the importance of engine preheating.

The correct air-fuel ratio can control the generation of harmful substances, and play a decisive role in prolonging the life of the three-way catalyst and reducing the failure rate. If there is a problem with the three, it can also reflect the incorrect air-fuel ratio for a long time. Therefore, it is very important to replace the vulnerable and consumable parts of the engine regularly, and the regular cleaning of the three-way catalyst and related accessories is also a necessary condition to ensure the normal operation of the engine.