The same principle of operation is also present in the soot particulate filter of the ceramic matrix. However, because of the high filtration efficiency and the poor relationship between NO2 and soot particles, it is impossible to burn all the soot particles, and only secondary injection with the help of the engine controller can make the particle filter The exhaust temperature of the engine is improved to burn soot particles.
As a result, the non-ceramic matrix PM dust filter has a filtration performance of up to 50% and has the following advantages:
1. High power loss due to pressure drop;
2. No secondary injection, reducing fuel consumption;
3.engine work is simple, there is no non-linear secondary injection.
Non-linear jet will bring what problem? Not long ago, Toyota has come to this conclusion: Japan’s D-Cat vehicle exhaust system is the diesel particulate filter and nitrogen oxide catalyst combined with the exhaust gas purification system. After thousands of kilometers in the car, this D-Cat exhaust purification system that is lost to the role of exhaust gas purification. Toyota explained this phenomenon: “exhaust gas purification system is not tested under normal operating conditions, there is no regeneration test, there is no regeneration performance, the catalyst can not be sustained to ensure strict emission limits.If it is possible to purify System is regenerated, the reversal of the nitrogen oxides will return to the normal limit. “