Since July 1, 2019, the national sixth-stage motor vehicle pollutant discharge standards have been implemented nationwide, marking the full opening of the country's six era. The arrival of the Sixth era has accelerated the green upgrade of engine technology. The engine technology used to improve emissions and fuel economy has also placed further demands on the energy-saving and environmental performance of vehicles. Therefore, based on closely following the technological innovations and user needs of the industry, Kelan has released the DPF cycle cleaning system, which will help the Blue Sky Defence Campaign and provide cutting-edge solutions for China's environmental protection. This time, we launched the National Sixth Post Processing System Solution. The aftertreatment system consists of the following components: catalytic converter: DOC+SCR+ASC particle trap: DPF urea supply unit, injection unit fuel metering unit, injection unit sensor: temperature sensor, nitrogen oxygen sensor, differential pressure sensor, PM sensor. DPF is made of porous wall flow ceramic material and coated with precious metal coating, which is divided into four parts: package, clamp, carrier and gasket. The main function of DPF is to capture soot particles in diesel exhaust. And other particulate matter to purify the exhaust gas; these soot particles captured by the DPF are burned off inside the carrier in an active or passive regeneration manner and converted into a small amount of ash; these ash are an incombustible substance The main components are the chemical components of lubricating oil additives, such as calcium, sulfur, zinc and phosphorus compounds; with the use of DPF, these substances will accumulate and block the DPF, causing engine torque limiting, power reduction, fuel consumption increase, and even direct damage. DPF assembly. Therefore, it needs to be processed regularly through a professional cleaning process. DPF regeneration type DPF regeneration is divided into passive regeneration and active regeneration. Passive regeneration: NO is oxidized to NO2 in DOC, NO2 is more active than O2, and carbon particles are oxidized at 250-450 °C. Active regeneration: In actual operating conditions, the exhaust gas temperature does not reach the passive regeneration condition (exhaust temperature 250-450 °C), and the oxidation reaction should be carried out in the DOC by injection to increase the exhaust gas temperature to above 550 °C. The carbon is burned and oxidized to form carbon dioxide. Passive regeneration has been carried out all the time, but the speed of passive regeneration is different due to different exhaust temperatures; active regeneration is divided into driving regeneration and in-situ regeneration, in which the vehicle regeneration is automatically executed after the engine runs to medium load; For example, running high speed, running the provincial road, the engine will automatically perform the driving regeneration; after running for a period of time in low-speed and low-load working conditions such as urban working conditions and traffic jams, the driver needs to stop and press the regeneration button on the moving car to perform regeneration, usually when regeneration The in-place regeneration can be performed after the indicator is lit. But drivers and friends don't have to worry about it. When the vehicle has a DPF blockage, there will be corresponding fault prompts on the car. Xiaobian knows the first-hand information from the technicians of the car factory and shares it with everyone. When the regeneration indicator (Fig. 1) is lit or flashing, be sure to stop near the safe, pull up the parking brake, keep the engine idling, press the in-situ regeneration switch (Fig. 5), and perform the engine in-situ regeneration. When it takes 30 to 45 minutes to regenerate in situ, the engine speed is obviously increased (1500 rpm). After the engine automatically returns to idle speed, the regeneration indicator (Fig. 1) can be driven normally after being extinguished. No operation is allowed on the engine during regeneration. If there is no response after pressing the regeneration switch, please check if the clutch is depressed, whether the brake is depressed, whether the accelerator pedal is depressed, whether the cruise and power output (PTO) switch are pressed. Whether the air conditioner switch is pressed or not, and the regeneration switch (Fig. 4) is prohibited. If the regeneration indicator (Fig. 1) is off, after the engine is turned off for five minutes, the ignition cycle is executed three times in succession to extinguish the OBD fault indicator (Fig. 2). Note: The turbocharger emits a slight “bump†during regeneration. This is normal. Xiaobian special reminder: If the above two fault lights appear, please ask the driver friend to stop the DPF in time. Innovative excellence, high efficiency and environmental protection, and fearless challenges. As a provider of the overall solution for the National Sixth System, our solutions have been available for DPF plugging, and we are fully committed to helping the country and bringing benefits to customers and users! Piping Joint,Flexible Joint,Rubber Joint,Pvc Pipe Joint SUZHOU YUEDA VALVE CO., LTD. , https://www.szyuedavalve.com
Heavy diesel vehicle emission regulations 
National Six Post-Processing System Technical Route and System Architecture 
Passive regeneration 
Passive regeneration
Regeneration process: The core of the diesel exhaust gas collected in the DPF is solid carbon (C), which contains a polymer that is not completely produced by engine combustion. The less the engine burns, the lower the quality of the fuel and lubricant, the easier it is to produce more polymer. The salt containing the lubricating oil or fuel additive element is blocked in the DPF. The main components are calcium salt, sulfate, Zinc-containing salts and phosphates cause severe blockage of DPF and affect normal vehicle use. Due to the special structural design of the DPF, the ash (Ash) (mainly lubricating oil ash and sulphated ash) generated by the regeneration of dry soot and organic matter on the DPF after a period of use cannot be actively removed and accumulated to a certain extent. Need to be manually removed.
Particulate matter accumulates in the DPF channel and surface, and DPF clogging occurs. When the vehicle engine runs at high speed, the displacement is large, and the pressure at the DPF inlet end rises instantaneously, causing the DPF carrier to be displaced to the exhaust direction. With the displacement and even the phenomenon of liner rupture and DPF carrier perforation, the DPF channel clogging problem should be solved in time, and high pressure should be avoided at the DPF end to avoid irreversible damage such as carrier displacement, gasket damage and DPF perforation. . 
DPF blockage 
Guoliu Vehicle Aftertreatment System Fault Light Series