The urea editor of Guangdong Baodi automobile tells the vast majority of Kayou that the detection method of SCR catalyst blockage is as follows:

1. Sense the temperature difference between front and back of SCR catalytic converter to judge whether it is blocked or not.

2. In the test run, the maximum speed is not reached, the acceleration is not good, the fuel consumption is increased and the power is weakened, which is also the possible manifestation of SCR catalyst blockage.

3. Abnormal noise

1) When the catalytic carrier inside SCR catalytic converter breaks down, the abnormal sound can be heard when the vehicle runs.

2) When you step on the accelerator, you will hear the noise of "crashing" under the chassis, such as fried beans in an iron pan. It is the sound of the broken catalytic carrier continuously impacting and shaking the exhaust pipe wall under the high temperature and high pressure airflow.

3) When you loosen the throttle, you will immediately hear the "clatter clack clang clang clang clang clang clang clang clang clang clang" noise of the steel barrel wall, which is the sound of the exhaust pressure suddenly weakening the rebound of the fragments and striking the barrel wall at the front end of the exhaust pipe.

4) When parking idle, you can hear a slight "clicking" scrolling bounce noise. When you step on the accelerator and release it immediately, you can also hear the "jingling clanking clanking clanking clanking clanking" clanking sound. The abnormal noise is emitted from under the chassis, not from the cabin.

5) When the car stops, the heat under the chassis is abnormal. When the car stops after a long period of driving and people are near the car, you will vaguely feel the hot air transpiration from the bottom of the car, which is the heat emitted from the front cylinder barrel of the burnt exhaust pipe.

6) The frustration of unlocking the throttle during driving is obvious, which is caused by the sudden decrease of exhaust pressure after unlocking the throttle, resulting in the rebound of the compressed fragments blocking the exhaust front port, and then affecting the engine work to form a sudden restraint resistance.

7) The exhaust emission test is not up to the standard. The cause of formation is complex, and the blockage of SCR catalyst is one of the important reasons.

Conclusion:

SCR catalytic converter is an effective device to reduce harmful emissions from automobiles. It not only has high conversion efficiency and long service life, but also has good ignition characteristics (catalytic temperature), flow characteristics (flow uniformity), temperature characteristics (temperature uniform distribution, high temperature resistance). Faced with the increasingly high-tech SCR catalysts, it is recommended that owners should stop repair in time when abnormal working conditions such as overheating, surge, tempering or repeated stall occur, because these conditions can lead to permanent damage to SCR catalysts!