Project cases which we have done for more than clients from more than 60 country.

Diesel Particulate Filter (DPF) Ash Cleaning

This article summarizes the most prevalent DPF ash cleaning process available.  The article presents the application of  cleaning techniques, as well as a customized approach to ash cleaning based on the specific ash properties and distribution in the DPF.

Available Cleaning Processes

A number of ash cleaning systems exist, with the most common being pneumatic-based, utilizing reverse flow of air through the DPF to blow out the accumulated material.  The frequency of filter cleaning is generally specified by the engine or equipment manufacturer, based on pre-determined maintenance intervals.  The actual frequency of DPF ash cleaning will depend on many factors including the effectiveness of an previous cleanings (i.e. amount of residual ash), engine oil consumption, and the vehicle drive cycle.

The ease with which ash can be removed form the DPF channels depends on two primary factors, namely the strength of the ash bond to the DPF walls, and the location of the ash deposits within the filter.  For most DPF applications, a large quantity of the ash is packed in the end plugs.  This type of ash is generally the most difficult to remove using conventional pneumatic cleaning approaches.  Regardless of the specific cleaning system, pneumatic approaches are limited by the fluid dynamics, which drives the flow along the path of least resistance.  As shown in Figure 1 reverse flow by-passes much of the ash plug, flowing instead around the plug and through the open portion of the channels.


Why is this important for DPF ash cleaning?

Not all DPF ash is the same, and not all DPFs benefit equally from the same type of cleaning process. Filters can be most efficiently cleaned and recovered when cleaning processes are selected which are designed to target the specific ash deposits present in the filter.  DPF inspection and diagnostics are a key component of any cleaning process to ensure cleaning effectiveness and track filter health.

DPF Filters -How to Cure Your Sick Car For Cost-Effective Way!

Starting with 2007 model years in European, diesel trucks are “blessed” with a diesel particulate filter (DPF). DPFs grab soot from your exhaust before it blows out into the environment.

As the exhaust gases pass through the filter, it captures somewhere between more than 95% of diesel particulate matter (PM). DPF maintenance is relatively straightforward. Over time, soot builds up in the filter walls and must be cleared out. A warning light usually shows up indicating it is time to literally burn out the accumulated soot. This process of burning is called regeneration. In addition to regeneration, periodic DPF cleaning is required too.

DPF Removal?

Driving without a DPF Filter can be against the law and quite unnecessary. Already, more than 1,000 diesel car owners have been caught removing the filter, though experts believe that the problem is much more prevalent.

These filters easily become clogged, especially when driven by vehicles in the city. Town and city cars will often be driven at low speeds in residential areas without ever getting a motorway run that can often unclog the DPF filter and regenerate it.

Replacements tend to be expensive,at least €3000 , which is why many of the top garages have offered to take them off completely.

How do I make my DPF Filter without spending more and more?

DPF regeneration is the core , GXLJ actively seeks the opportunities to license its technologies. By leveraging GXLJ’s technologies, our company can achieve enhanced competitiveness through lower research and development costs and reduced time to market. Currently these two patented regeneration filter are available for heavy duty vehicle diesel applications and off-road diesel products.

Our Advantage

– Successful filter regeneration by optimized burner system regardless of any running conditions

– Regeneration in idling and low speed operation

– Catalytic regeneration in medium and high speed operation

– Minimized regeneration time by state-of-the-art control logic

– Optimized design to prevent thermal shock and HC slip

– Setup disassemble flanges to replace broken DPF substrate , keep the stainless steel housing shell original

-No need DPF removal maintenance and clean too often ,2-3 time one year ,saving cleaning cost more than 90%


So are you guys your diesel cars now also installing DPF or preparing to purchase original DPF? As known recently, we have batch of DPF filters installed in some users where to start running, the effect has also been tested. Hope that our equipment will solve your immediate needs at the expense of DPF.




Langjie Euro IV Catalyst Converter with Muffler Mass Production for Yuchai Bus

Huihuang Langjie started cooperation with Yuchai Group since 2001.

We maintain a very well partnership till today, and supply more and more products for their new product categories.

In June, latest batch of Langjie Euro IV Catalyst Converter with Muffler were on Mass Production for Yuchai new Bus.

As the  delivery date was very close, all products were packed once they are finished and passed quality inspection.

Yuchai new  buses were equipped with our brand new Euro IV Catalyst Converter with Muffler. As you saw, they are quit compatible.

Batch assembly completed and will handed over to city bus company soon.

YuChai T4 Project Technical Seminar Was Held Successfully In Our Company

On April ,17 th, Yuchai Machinery Co.,ltd successfully held the technical seminar about catalytic purification for non-road engineering machinery . As an invited guest, our Chief Engineer Mr. Liu Guangwen made a detailed introduction for the domestic T4 emission standard and after-treatment product.