Different use
It does not match the engine, even if it is the same engine, the same three-way catalytic converter, different models, the common working range of the engine is different, the exhaust condition changes, and the position where the three-way catalytic converter is installed is different, which will affect the The catalytic conversion effect of a three-way catalytic converter. Therefore, different vehicles should use different three-way catalytic converters.
Oxygen transfer failure
In order to achieve the best exhaust gas catalytic rate (above 90%), an oxygen sensor must be installed in the engine exhaust pipe to realize closed-loop control. The working principle is that the oxygen sensor will measure the oxygen concentration in the exhaust gas, convert it into an electrical signal and send it. Give the ECU to control the air-fuel ratio of the engine in a narrow and near-ideal area (14.7:1). If the air-fuel ratio is large, although the conversion rate of CO and HC is slightly improved, the conversion rate of NOx is sharp. dropped to 20%,
Therefore, the best air-fuel ratio must be guaranteed to achieve the best air-fuel ratio. The key is to ensure that the oxygen sensor works normally. If the fuel contains lead and silicon, the oxygen sensor will be poisoned. In addition, improper use will also cause carbon deposition in the oxygen sensor, ceramic cracking, heater resistance wire burnout, internal circuit disconnection and other faults. Failure of the oxygen sensor can lead to misalignment of the air-fuel ratio, worsening exhaust conditions, reduced catalytic converter efficiency, and reduced catalytic converter service life over time.