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Verified Retrofit Technologies from Johnson Matthey
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| Technology | Engine Model/Application |
Retrofit Fuel, Max Sulfur (ppm) | Reductions (%) † | |||
|---|---|---|---|---|---|---|
| PM | CO | NOx | HC | |||
| CEM™ Catalytic Exhaust Muffler and/or DCC™ Catalytic Converter | Highway, heavy, medium, and light heavy-duty, non-urban bus, 4-cycle, non-EGR model year 1991 - 2003, turbocharged or naturally aspirated engines | 500 | 20 | 40 | n/a | 50 |
† - Baseline assumes an unmodified engine running on regular 2D (<500 ppm sulfur) fuel.
Note: This verification applies to highway engines only.
The reductions are based on the installation of retrofits to engines that were originally produced without diesel oxidation catalysts or diesel particulate filters.
The following operating criteria are required to be met when retrofitting highway engines with the CEM™ or DCC™:
- The engine exhaust temperature must achieve at least 150 degrees C during its duty cycle.
- The engine should be well maintained and not consume lubricating oil at a rate greater than that specified by the engine manufacturer.
- The engine must be operated with a fuel that contains a sulfur content of no more than 500 ppm.
| Technology | Engine Model/Application |
Retrofit Fuel, Max Sulfur (ppm) | Reductions (%) | |||
|---|---|---|---|---|---|---|
| PM | CO | NOx | HC | |||
| Continuously Regenerating Technology3 (CRT3) Particulate Filter | Highway, medium and heavy heavy-duty, 4 cycle, non-EGR, model year 1994 - 2006, turbocharged or naturally aspirated engines | 15 | 90 | 72 | n/a | 93 |
The following operating criteria must be met in order for appropriately retrofitted engines to achieve the emissions reductions above:
- The engine exhaust temperature must be at least 240° C for approximately 40 to 50 percent of the duty cycle. As there may be variations from application to application, data-logging and a review of actual vehicle operating conditions is required to ensure CRT3 compatibility.
- The engine’s exhaust must produce a NOx/PM ratio of at least 8, with an optimum ratio approaching 20. JM will make an assessment of the suitability of candidate engines, based upon certification emission levels or emission test data.
- The engine should be well maintained and not consume lubricating oil at a rate greater than that specified by the engine manufacturer.
- Johnson Matthey installs a backpressure monitor and high pressure indicator light on all vehicles equipped with a CRT.
- The engine must be operated with a fuel that contains a sulfur content of no more than 15 parts per million (ppm).
| Technology | Engine Model/Application |
Retrofit Fuel, Max Sulfur (ppm) | Reductions (%) | |||
|---|---|---|---|---|---|---|
| PM | CO | NOx | HC | |||
| Advanced Catalyzed Continuously Regenerating Technology (ACCRT) System | 4-cycle, on-highway; light-, medium-, and heavy- heavy duty diesel engines including turbo-charged or naturally aspirated, EGR and non-EGR, and originally manufactured from 2002 through 2006 model years | 15 | 90 | 50 | n/a | n/a |
The following operating criteria must be met in order for appropriately retrofitted engines to achieve the emissions reductions above:
- The engine may or may not have a pre-existing original equipment manufacturer oxidation catalyst.
- The engine must not have a pre-existing diesel particulate filter.
- The engine must be certified at a PM emission level of at most 0.1 grams per brake horsepower-hour (g/bhp-hr).
- The engine must be electronically controlled.
- The engine should be well maintained and not consume lubricating oil at a rate greater than that specified by the engine manufacturer.
- Lube oil, or other oil, should not be mixed with the fuel.
- The engine must be operated on diesel fuel with a sulfur content of no more than 15 parts per million by weight.
- For reliable regeneration, the NOx to PM ratio, based on certified emissions levels, should be 20 or higher, and the engine cycle must be at 240° Celsius for 40% of the operation time.