Do diesel aftertreatment systems reduce tailpipe emissions?
While diesel aftertreatment systems could contribute significantly to reduce tailpipe emissions, the design of cleaner diesel combustion system is the ultimate goal of powertrain system providers worldwide. C.S. Hardy, ... D.M. Ainsworth, in Fuel Systems for IC Engines, 2012
What is a diesel aftertreatment system?
It is a series of components that cleans the diesel exhaust emitted by the engine prior to releasing it through the tailpipe to the outside air. Its purpose is to reduce the emission of harmful pollutants into the environment. Numerous clean air acts and laws have been passed over the years, so aftertreatment systems have continued to evolve.
Are aftertreatment systems a “truck thing?
It’s a myth that aftertreatment systems are solely a “truck thing.” The reality is that the aftertreatment systems on commercial vehicles are only slightly different than the system on your own personal vehicle. Not only does the exhaust come out exceptionally clean, today’s trucks also get better fuel economy and have more torque and horsepower.
What type of fuel should I use in my aftertreatment system?
All aftertreatment systems are relying upon the use of fuel with a sulphur level below 15 ppm. Experience in the past with low sulphur fuel has shown that the lubricity of the fuel can suffer during the sulphur removal process and additives are necessary to ensure adequate lubrication for the fuel injection system.
Which engine is more environmentally friendly?
Diesel Engines Emit Less CO2 And Greenhouse Gases (GHG) As a result, less fuel is used to travel the same distance, allowing to save more CO2. Most estimations indicate that diesel engines emit about 10% less than the petrol engines of the same category.
Which is the most effective after treatment for reducing engine emissions?
Exhaust gas recirculation (EGR) has been known for a long time and is a well-proven and effective means of reducing NOx emissions from both spark ignited and diesel engines [286] .
Do diesel engines help the environment?
Because diesels are more efficient, they do in fact emit less carbon dioxide than gasoline engines. Diesel fuel contains about 12 percent more energy per gallon than ordinary gasoline, and about 16 percent more energy than gasoline that contains ethanol.
What does a after treatment do?
An aftertreatment system is a method or device for reducing harmful exhaust emissions from internal-combustion engines. In other words, it is a device that cleans exhaust gases to ensure the engines meet emission regulations.
How does engine emission affect the environment?
The pollutants in engine emissions from vehicles and lawn equipment cause damage to lung tissue and can lead to and aggravate respiratory diseases, such as asthma. Motor vehicle pollution also contributes to the formation of acid rain. The pollution also emits greenhouse gases that cause climate change.
How can we reduce the pollution of diesel engines?
To reduce diesel emissions, we help fleet managers find grants, replace old engines, install exhaust retrofit equipment, reduce idling, and use cleaner fuels. Port equipment, ships, and large trucks emit large amounts of diesel pollution.
Which fuel is better for the environment?
Diesel engines get better fuel economy than gasoline engines. Diesel and diesel engines produce fewer and less toxic emissions than gasoline and gasoline engines. They are safer for the environment.
Is diesel less polluting than petrol?
Although diesel cars obtain 25 to 35 percent better mileage and emit less carbon dioxide than similar gasoline cars, they can emit 25 to 400 times more mass of particulate black carbon and associated organic matter ("soot") per kilometer [mile].
How does diesel affect the environment?
Environment - Emissions from diesel engines contribute to the production of ground-level ozone which damages crops, trees and other vegetation. Also produced is acid rain, which affects soil, lakes and streams and enters the human food chain via water, produce, meat and fish.
What do you mean by after treatment?
Definition of aftertreatment : a secondary treatment to which a material (as film or dyed goods) is subjected after the primary treatment is finished.
What is after treatment problem?
Diesel aftertreatment problems can show up as a variety of symptoms: Poor mileage (mpg) Reduced engine power / throttle response. Plugged DPF filters.
What is aftertreatment problem?
Problems with your aftertreatment system can cause increased engine backpressure, reduced efficiency and excessive regens. If the problem isn't fixed quickly, it can end with expensive repairs and unscheduled downtime.
The Environmental Impact
Studies show that rebuilt engines need 50% less energy and only 67% of the labor required to produce new engines.
Green Benefits From Remanufacturing
The Automotive Parts Remanufacturers Association, an industry group dedicated to promoting remanufacturing processes, outlines several areas where its members’ practices benefit the environment. Our remanufacturing process reflects these outcomes.
Comprehensive Approach
The remanufacturing process is actually one component of a larger recycling and energy conservation effort at our company. We’ve upgraded lighting at our site to high-efficiency fluorescents and LEDs that save energy and provide a safer work environment.
Why is vehicular pollution a problem?
Vehicular pollution has become a major problem in urban areas due to the exponential rise in the number of automobiles. Typical exhaust emissions which include nitrogen oxides (NO x ), hydrocarbons (HC), carbon monoxide (CO), soot, and particulate matter (PM) undoubtedly have an unpleasant effect on the environment.
What are the problems of vehicular pollution?
Vehicular pollution has become a major problem in urban areas due to the exponential rise in the number of automobiles . Typical exhaust emissions which include nitrogen oxides (NO x ), hydrocarbons (HC), carbon monoxide (CO), soot, and particulate matter (PM) undoubtedly have an unpleasant effect on the environment. Several pollution control bodies are taking this subject seriously and issuing stringent emission norms which are to be complied strictly. Thus, regulation of these harmful pollutants is the need of the hour. Alternative fuels such as biodiesels and alcohols which are considered as a potentially viable solution for the problem of fossil fuel depletion also tend to require exhaust gas after-treatment in order to comply with the upcoming emission norms. Hence, this paper attempts to give a brief insight on the development and advances of different after-treatment devices like diesel particulate filter (DPF), lean NO x trap (LNT), diesel oxidation catalyst (DOC), and selective catalytic reduction (SCR).
Is biodiesel a viable alternative to fossil fuels?
Alternative fuels such as biodiesels and alcohols which are considered as a potentially viable solution for the problem of fossil fuel depletion also tend to require exhaust gas after-treatment in order to comply with the upcoming emission norms.
What is CAE in automotive?
CAE (computer assisted engineering) has become a popular tool for development of both the automotive catalyst and the total after-treatment system . This paper reports on using the CAE approach for modeling the DOC (diesel oxidation catalyst) + CSF (catalyzed soot filter) system. Two cases of modeling are shown here. One case is a modeling of DOC pre-cat in which the transient HC (and CO) gas performance is required. In this model, the parameters shown below are used; the random pore model for a gas diffusion, HC adsorption capacity as a function of temperature, HC desorption rate and HC reaction rate. Calculated catalyst performance correlated to the experimental results, thus validating the model. Another case is a modeling of DOC + CSF in which active regeneration of CSF is required. The CSF is used for diesel exhaust soot filtering, and the accumulated soot is periodically combusted to regenerate the CSF. Additional fuel is supplied to the DOC by post injection and/or fuel dosing into the exhaust pipe upstream of DOC and the resulting exotherm provides the heat for soot combustion on the CSF. In this study the uniformity of soot regeneration in the CSF was investigated as a function of fuel supply uniformity to the DOC.
How does EGR reduce NOx?
However, while these are proven paths to reducing NOx emissions, there are trade-offs associated with each approach. EGR limits combustion temperature by introducing cooled exhaust gas into the intake system, reducing NOx. EGR has the advantage of causing a relatively small change in the amount of ancillary hardware.
What is the advantage of EGR?
EGR has the advantage of causing a relatively small change in the amount of ancillary hardware. However the combustion efficiency is reduced due to lower oxygen concentration, producing higher levels of PM; lower NOx is traded off for higher exhaust PM, hydrocarbons and carbon monoxide.
Does running the exhaust system too often increase CO2?
All on-board active systems use extra fuel through burning to heat the DPF, therefore running the cycle too often while keeping the back pressure in the exhaust system low will result in increased fuel consumption and hence increased levels of CO 2.
Is biodiesel a fuel injection system?
In addition, the introduction of bio-diesels is a cause of concern for fuel injection systems. The first generation of bio-diesels based on the esterisation of plant oils are subject to oxidation and deterioration with time.
Does exhaust throttling reduce air-fuel ratio?
Intake or exhaust throttling may reduce air–fuel ratio and increase the exhaust temperature for the aftertreatment system (e.g., DPF regeneration, SCR, LNT). Exhaust throttling generally produces less BSFC penalty than the pre-compressor intake throttling. However, any throttle valves placed in any part of the engine air system increase BSFC significantly, and their use should be avoided or minimized in engine system design. Although all the air control valves can achieve a wide range of controls of exhaust temperature and space velocity by adjusting the air flow rate, only VVA (e.g., early or late IVC, or cylinder deactivation) can achieve them without BSFC penalty. Early EVO and the valve events to obtain internal EGR may also increase the exhaust temperature. The benefit of exhaust temperature increase by VVA is especially important at light loads and during warm-up.
What is the purpose of aftertreatment?
Its purpose is to reduce the emission of harmful pollutants into the environment. Numerous clean air acts and laws have been passed over the years, so aftertreatment systems have continued to evolve.
What is aftertreatment system?
Aftertreatment Systems 101. As you know, trucks are complex pieces of equipment with many components working together to create an efficient, safe and clean machine. The aftertreatment system, or ATS, is one such important part of the truck. There are some misconceptions about aftertreatment systems, so let’s take a moment to clear them up.
Can aftertreatment be used in trucking?
Yes and no. Aftertreatment issues are certainly concerns for all owner-operators and trucking companies today. It is a complex system with sophisticated components that, by law, must be working properly at all times. Although ATS issues can cause downtime and expenses, these issues can be reduced with proper maintenance.
Is aftertreatment a truck thing?
It’s a myth that aftertreatment systems are solely a “truck thing.”. The reality is that the aftertreatment systems on commercial vehicles are only slightly different than the system on your own personal vehicle.
Inbox Insights
Sign up for our e-newsletter for more information, along with the latest industry news and expert tips.
Industrial Diesel Engines
Cat engines with Tier 4/Stage V technology meet global emissions standards.
Industrial Diesel Power Units
Our integrated power units are ready made for irrigation, industrial, mining, pump and other applications and meet global emissions standards.
Industrial Diesel Fire Pumps
Cat fire pump engines have a reputation for reliable, efficient service.
How are modern engines becoming more efficient?
Modern engines are becoming increasingly efficient. This means that more energy is converted into mechanical power, and less heat is lost through the exhaust system. This makes all the previous points more crucial with respect to light-off times.
Why is full vehicle testing important?
Full vehicle testing is the best way for acquiring data about the overall environmental suitability and operational durability of vehicles. Testing the entire vehicle, as opposed to just the subsystems, is particularly useful. Possible problems regarding any interference arising from various subsystems can be detected.
How does an E cat work?
The E-cat significantly reduces cold starting times, resulting in the pollutants in the exhaust gas being eliminated at a much earlier stage . Heated metal catalysts are supplied with between 1 and 3 kW of power. This raises the catalyst operating temperature by a crucial 20 to 30°C (or up to 100 °C in passenger cars).
What is EGR in diesel?
EGR is commonly used by engine manufacturers as a method for complying with new engine emission control standards. Diesel particulate filters (DPFs) are exhaust after-treatment devices that significantly reduce emissions from diesel-fuelled vehicles and equipment. DPFs typically use either porous ceramics, cordierite substrates or metallic filters ...
Do E-cats affect fuel consumption?
In vehicles with braking energy recovery systems, E-cats do not affect fuel consumption, thus keeping the cost of this type of ‘active’ catalyst system within reasonable limits. There is a downside to these systems: the electricity consumed by the systems results in extra fuel consumption.
Can a vehicle be tested in a large climatic chamber?
Full vehicle testing - even large off-highway vehicles - is possible in large climatic chambers under controlled conditions, which also allows the systems to be calibrated. This means that the whole vehicle can also be included in the equations. The influence of components in the immediate proximity can be measured.
LATEST SERIES POST
So, you’ve determined you need a new truck battery. Well, wait a second, let’s start here: Are you sure you need a replacement, or can...
LATEST SERIES POST
Getting to the core of a truck service problem as quickly and accurately as possible is key to reducing dwell time for the fleet and...
Use genuine parts
When repairs to diesel engine aftertreatment systems are needed, OEMs advise that fleets replace components with genuine parts to ensure that they are manufactured and validated to work with the system.
