National Six Limited Torque Case (2): Dpf Blockage Failure Analysis
The implementation time of national VI emission standard is slowly approaching, and many main engine manufacturers have laid national VI products in the channel. As we all know, DPF is a necessary component in the post-treatment system of national VI diesel engine. Due to the high technical content and high cost of this system, if the DPF is blocked, it will affect the normal driving of the vehicle. Reasonable use and maintenance of DPF is an important skill for the normal use of National VI diesel engine.
1、 What is DPF and what is its use?
DPF (Particle Catcher) is a ceramic filter installed in the aftertreatment system of diesel engines, which mainly filters the particulate matter (PM) from exhaust gas emissions to purify the exhaust gas.
1.Composition of DPF:
It is made of porous wall flow ceramic material and coated with precious metal coating, mainly including packaging, clamp, carrier and gasket;
2. Functions of DPF:
Its main function is to capture soot particles and other particles in diesel vehicle tail gas, so as to purify the tail gas, burn it through regeneration and generate harmless carbon dioxide. DPF can effectively purify more than 90% of particles in exhaust gas.
2、 Why is the DPF blocke
These carbon soot particles trapped by the DPF are burned off inside the carrier in an actively or passively regenerated manner and converted into a small amount of ash material, which is a non-combustible substance that is mainly composed of chemical components of lubricant additives such as calcium, sulfur, zinc and phosphorus compounds.