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Cambustion DPG with dual diluter and ash doping system

DPG l Particle Filter Testing System

Particle Filter Testing

Generating reproducible results from Diesel and Gasoline Particulate Filters using an engine test cell is expensive and time consuming, these drawbacks were the motivation behind creating the Cambustion Particle Filter Testing System (DPG).

After 15 years of development Cambustion DPG is now the system for the complete automated testing of Diesel and Gasoline Particulate Filters.

Based around a Diesel burner and accurate flow bench, the DPG facilitates testing of GPFs and Light, Medium, Heavy and Super-Heavy Duty DPFs at full scale flows and temperatures.

The DPG is used in both Quality Assurance (QA) testing and for R&D applications:

In QA applications, the DPG offers a standard characterization of Δp and filtration efficiency vs soot load, reproducible across different laboratories, and a standardized and automated method for comparing the Soot Mass Limit (SML).

In R&D, the DPG offers filter developers a faster and more repeatable comparison of different filter designs and coatings than engine testing, while for vehicle and engine developers it provides fast soot loading of filters for regeneration strategy and calibration development. Optional extras such as online ash doping or particle number measurement upstream and downstream are now available.

The Cambustion DPG Solution

Soot and Ash Loading

The dependence of filter backpressure (Δp) on the soot load is a very important quality control parameter for modern engine control strategies where a backpressure sensor is used in the triggering of filter regenerations. The DPG loads a filter from an empty state and continually monitors Δp and automatically processes the results using loaded and empty weighing of the filter to provide a far better measurement of loading behaviour than is achievable with engine testing.

The DPG package can include an online fuel doping system. The fuel doping system is typically used to add extra oil additive into the fuel flow, which generates ash when burnt. This allows the DPG to load a particle filter with ash during a soot load, clean mode or regen. The DPG can be used for ash capacity and ash deposition studies.


Control over the DPF inlet conditions allows the DPG to regenerate filters. This can provide a simple means of de-greening filters, regeneration after soot loading tests, or allow more complicated studies such as Soot Mass Limit tests, where the DPG’s improved reproducibility and repeatability offer substantial advantages.

The DPG can generate soot whilst maintaining regeneration conditions within the particle filter, which will test the regen filtration efficiency performance of a filter.

Filtration Efficiency

Particle mass and/or number measurement can be included within a DPG package. Both options include upstream and downstream measurement with automatic calculation of the live filtration efficiency. Empty filtration efficiency can be studied using a small burst of particles, the integrated particle number upstream and downstream are used to calculate a filtration value.

Cold Flow Tests

The DPG can also make cold flow tests, and results may be corrected to any set of reference conditions.


Compared with engine testing, the DPG offers significantly improved repeatability and much lower capital and operating costs than an engine test facility: infrastructure requirements are minimal, tests are highly automated and high soot generation rates maximise throughput while minimising fuel and energy consumption.

The DPG allows customers to study the behaviour of a filter without the corresponding difficulties associated with engine tests, avoiding issues such as passive regeneration due to NOₓ and engine / filter interactions due to backpressure.

The DPG can be fitted with a tertiary high temperature electrical heater, allowing burner off warming of particle filters without impacting filter performance.


For a list of Application Notes which offer detailed guidance on common uses of the DPG, click here.

In production quality assurance applications the DPG allows validation of backpressure characteristics, filtration efficiency and regeneration performance.

In an R&D environment the DPG provides an economic solution with soot and ash loading of filters, catalytic activity comparison between substrates and durability studies. The control software can be easily configured to interface with an array of instruments and analysers to monitor all possible aspects of particle filter behaviour.

Key Application Notes

TitleData TypeDownload FileSizeLast Updated
TitleDPG RepeatabilityData TypeApplication noteDownload Filedpg007v2-dpg-repeatability.pdfSize213.84 KBLast Updated
TitleCold flow DPF testing with the DPGData TypeApplication noteDownload Filedpg-003v2-cold-flow-testing.pdfSize243.36 KBLast Updated
TitleGasoline Particulate Filter (GPF) testingData TypeApplication noteDownload Filedpg012_v2-gpf-testing.pdfSize235.49 KBLast Updated

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Filter Test Housing accessory for bare brick testing

Cambustion offer a Filter Test Housing (FTH) for use with the DPG. This reusable DPF housing allows an uncanned filter to be fitted to the DPG and loaded / regenerated as required. The filter can be quickly removed for weighing and examination, even at elevated temperatures.

This ability is particularly advantageous in both R&D and Quality Control applications, and allows filters to be tested before coating or other final processes take place.

DPF&GPF Testing Service

Cambustion also offer a filter loading / testing service, using the DPG. For more information please see our Engineering Services pages.

Support & downloads

DPG Viewer v4.6

ZIP file containing Excel add-in.

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