What is aftertreatment system?
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.
What are the major pollutants from the exhaust of a gasoline and diesel engines?
The major products of the complete combustion of petroleum-based fuels in an internal combustion engine are carbon dioxide (13%) and water (13%), with nitrogen from air comprising most (73%) of the remaining exhaust. A very small portion of the nitrogen is converted to nitrogen oxides and some nitrated hydrocarbons.
What are the emissions from a diesel engine?
Common pollutants include unburned hydrocarbons (HC), carbon monoxide (CO), nitrogen oxides (NOx) or particulate matter (PM). Total concentration of pollutants in diesel exhaust gases typically amounts to some tenths of one percent—this is schematically illustrated in Figure 1.
What if petrol is used in diesel engine?
Putting petrol in a diesel car can cause serious damage to the fuel injection system and engine. When petrol is added to diesel it reduces its lubrication properties, which can damage the fuel pump through metal-to-metal contact and create metal particles causing significant damage to the rest of the fuel system.
Why gas engines are better than diesel?
Diesel engines are still more efficient than gas engines, but less so for those who are mostly engaged in city driving. Diesel cars also have more torque, which results in better fuel economy along with more impressive acceleration. Sometimes diesel rises above gas in price and other times drops below the cost of gas.
Why is diesel so bad?
Diesel engines produce higher levels of particulates, microscopic bits of soot left over from the combustion process. These can penetrate deep into the lungs, causing irritation and potentially triggering asthma attacks.
What are the most critical exhaust emissions from a diesel engine?
Diesel engines produce approximately 200 cubic feet of exhaust from 1 pound of fuel. Exhaust emissions are primarily CO2, CO, NOx, water vapor, and free nitrogen. Other exhaust pollutants include HC, particulates, 502 and odor.
What do you need to know about aftertreatment system?
Monitoring system condition and tracking fault codes can help fleets avoid big problems with their aftertreatment systems. Photo: Noregon A combination of better technology and better monitoring has allowed engine makers to extend DPF cleaning intervals.
Why is aftertreatment so important in a car?
“Significant effort and progress has been made in on-board diagnostics to catch such issues before damage is done to the DPF, and a well-maintained engine and aftertreatment system are vitally important to minimizing DPF issues.”
What should you know about aftertreatment in trucking?
As the filter ages, more material is left behind after a regen, which eventually requires more frequent regens. At some point it will need to be physically cleaned. The extent of the cleaning process depends on the condition of the filter.
How does Peterbilt deal with aftertreatment issues?
Oster said that Peterbilt specifically looked at sensors and wiring, which are often the culprits in aftertreatment downtime, and redesigned the systems using new chassis routings, which segregate air, fluid and electrical system routings on the frame rail.