Exhaust gas recirculation (EGR) is an emission control method that allows for large NOx emission reductions from a wide range of diesel engines, including light-duty engines, medium- and heavy-duty engines, and low-speed two-stroke marine engines. While the most common reason for installing EGR on modern commercial diesel engines is to reduce NOx emissions, it can also be used for a variety of other applications. For example, imparting knock resistance and reducing the need for high load fuel enrichment in SI engines, assisting vaporization of liquid fuels in SI engines, as an enabler for closed cycle diesel engines, improving the ignition quality of difficult-to-ignite fuels in diesel engines, or improving the performance of SCR catalysts are just a few of them. While NOx reductions using EGR had been reported as early as 1940, the first engine studies to investigate EGR’s NOx reduction potential looked to be carried out in SI engines in the late 1950s. EGR was seriously explored as a NOx management method for diesel engines by the 1970s.
In North America, EGR was widely employed for NOx control in spark-ignited gasoline-fueled passenger vehicle and light-duty truck engines from 1972/73 to the late 1980s. Some gasoline-fueled applications were able to do away with EGR after the early 1990s. EGR was first introduced to gasoline engines, then to diesel passenger vehicles and light-duty trucks, and finally to heavy-duty diesel engines. While there were uses in heavy-duty diesel engines as early as the 1970s, it wasn’t until the early 2000s that cooled EGR became widely used in North American heavy-duty diesel engines. Due to the more challenging technical hurdles compared to the prior light-duty applications, this heavy-duty application drew the greatest attention to EGR. After 2010, the use of EGR in spark-ignited engines was expandednot for NOx reduction, but for improved fuel economy. It was used not just on light-duty gasoline engines, but also on heavy-duty gasoline, natural gas, and propane engines. EGR reduces pumping losses, improves combustion efficiency, improves knock tolerance, and reduces the requirement for fuel enrichment in SI engines. Combining EGR with other engine control methods to boost exhaust gas temperature and facilitate the regeneration of diesel particulate filters is a possible non-NOx lowering application for current diesel engines.
The reduction in NOx emissions provided by EGR comes at a cost: extra steps are frequently required to avoid unacceptable increases in fuel consumption, PM, HC, and CO emissions, engine wear, and engine durability. To solve these trade-offs in commercial diesel engine applications, engine manufacturers have had to implement a number of other technological advances at the same time, including:
To meet a given NOx limit, more than one technological route exists, and EGR can occasionally be utilized as one of several alternative solutions. In heavy-duty Euro IV, Euro V, and US 2010 diesel engines, for example, there is competition between cooled EGR and urea-SCR technology. To fulfill increasingly strict NOx emission regulations, however, EGR may need to be used in conjunction with NOx reduction catalysts. The following table summarizes commercial EGR applications on diesel engines. Small-scale EGR applications occurred earlier than indicated in the chart on many occasions, owing to various voluntary incentive programs.
Is EGR bad for diesel?
Unfortunately, the EGR fumes from a diesel engine tend to produce a sooty mess that’s similar to cholesterol in your body. The sooty mess tends to clog the EGR valve, EGR cooler, intake ports, and any sensors that come into contact with it. Take a look at these two EGR valves for 6.0L Power Stroke engines. The one on the right is nearly fresh, while the one on the left has become so clogged with EGR that it has stopped working. Also, as horrible as EGR is, keep in mind that if your diesel is adjusted to shoot black smoke out the exhaust, your EGR system is exposed to the same stuff!
What does deleting EGR do?
When it comes to vehicle performance modifications, an EGR delete is one of the most popular choices. While most drivers are aware that installing this aftermarket equipment improves vehicle performance, few are aware of what an EGR delete is and why it is useful. Continue reading to learn more about the EGR valve and how an EGR delete can improve engine performance and power.
What is EGR?
Exhaust gas recirculation (EGR) is an acronym for “exhaust gas recirculation.” This is a technique for reducing nitrous oxide emissions in an exhaust system by recirculating some of the engine exhaust back through the cylinders. There are a number of significant drawbacks to this, the most serious of which being clogged intake systems. Excess soot not only degrades engine performance, but it also increases the likelihood of costly repairs.
EGR valves also lower engine efficiency, despite the fact that they are used to reduce air pollution. To provide the same amount of power, the engine must burn even more gasoline, resulting in increased air pollution.
What does an EGR delete do?
An EGR deletion kit is a performance item that eliminates the EGR valve and prevents exhaust from being diverted back to the engine. In the end, your vehicle will operate as if it never had an EGR valve.
Following the installation of an EGR deletion kit, you’ll notice a few important alterations. First and foremost, your engine will be significantly more powerful. EGR valves, as previously said, reduce efficiency and degrade engine performance. This leads to the following point: improved fuel efficiency. To generate the same level of power, your engine now has to work less hard, using less gasoline in the process. Finally, your engine’s lifespan will be extended. Soot builds up inside the engine, putting strain on the system and causing parts to wear out faster.
Does EGR damage engine?
The EGR solenoid is one of the most important components of the EGR system. A defective EGR valve can harm the EGR solenoid, which can lead to engine performance concerns.
The engine check light would illuminate, and the engine would begin to knock and ping.
The EGR solenoid opens when the EGR valve is fully opened, closing the link between the intake and exhaust manifolds.
Does EGR reduce engine life?
Does egr shorten the life of an engine? According to Weimer, the engine’s life is unaffected. He also noticed lower soot levels in the engines and fewer soot levels formed after operating the 2002 EGR engines.
Should I take off my EGR valve?
What happens if the EGR valve is turned off? Leaving aside the fact that removing the EGR valve is unlawful, many drivers undertake this adjustment in the hopes of saving money by providing a long-term solution to car maintenance costs.
The EGR valve tends to clog if the car is primarily driven in cities and/or at moderate speeds, requiring the driver to replace or regenerate the EGR valve. This is because the EGR valve, like the particulate filter in diesel engines, is kept clean if the automobile is driven for at least 30 minutes at an average speed of 80 km/h (50 mph). You might anticipate that an automobile used in the city will rarely be used for these journeys, necessitating more EGR valve and fap maintenance.
Those planning to carry out this illegal modification begin by removing the EGR valve and replace it with a simple pipe that allows for additional air flow without clogging. The control unit is then modified to swallow the emission parameters, which would otherwise be out of wack if the EGR valve was not present.
Removing the EGR valve will remove a component that requires regular maintenance, but it will also make your car less efficient while also causing harm to the environment and other drivers and road users.
What happens if EGR is stuck closed?
The combustion temperature rises if the EGR system is clogged or the valve is jammed closed. On light acceleration, this may produce pinging (detonation) as well as surging. A faulty EGR valve in a diesel engine is one of the sources of black smoke.
What are the pros and cons of EGR delete?
Exhaust gases circulate more often in the system when the EGR system valve or coolers become blocked with soot.
As a result of the blockage, temperatures around the engine rise. You can produce lower quantities of exhaust gas and encourage a lower temperature that cools the engine when it’s running by bypassing this design portion.
EGR Delete kits are very affordable for most vehicles
EGR deletion kits are available for less than $100 on various autos. Though this option won’t help larger, newer diesel engines, which already have a number of faults, tiny automobiles can greatly benefit from it. You could also consider tuning out the EGR.
Does EGR increase fuel economy diesel?
Diesel engine pollutants have a significant negative impact on both the environment and human health. Significant volumes of nitrogen oxides (NOX) are produced, which are a major contributor to smog, ground-level ozone, acid rain, and human ailments like asthma, coughing, and nausea. Exhaust gas recirculation (EGR), which returns a portion of the engine exhaust gas to the combustion chamber through the intake system, has a lot of promise for lowering NOX emissions. The consequences of applying this technology to spark ignition and compression ignition engines on engine performance, inlet air temperature management, combustion control, and dual-fuel operation have all been investigated. The usage of EGR rate has the potential to reduce NOx emissions due to thermal, chemical, and dilution effects. The thermal effect reduces combustion temperature due to the greater specific heat of exhaust carbon dioxide (CO2) and water (H2O) relative to oxygen (O2) and nitrogen (N2) in the intake air. The dilution effect occurs when the oxygen mass fraction in the fresh intake air charge is reduced due to the displacement of some of the oxygen by inert gases, resulting in a fall in the local flame temperature due to the flame’s spatial broadening. Recirculated H2O and CO2 are dissociated during combustion by an endothermic mechanism in the chemical effect, lowering flame temperature and changing the NOX production process.
The combustion characteristics, performance, and emissions of a 49-kW stationary diesel engine running on diesel fuel containing 7% biodiesel (B7) are investigated for various EGR rates and loads. The goal is to see if retrofitting an EGR system to an engine that wasn’t designed with this technology can cut NOX effectively without degrading engine performance or increasing other emissions (CO2, CO and THC). It also intends to see if employing a fuel blend that includes an oxygenated biofuel can compensate for the reduced oxygen availability in the gas while using EGR. The choice of B7 is justified by Brazilian government decree No. 13033/2014, which mandated that biodiesel be added to diesel oil at a rate of 7% beginning November 1, 2014. CO and THC are projected to be effectively oxidized with the usage of the biofuel blend, avoiding large increases in emissions of these components. In Brazil, there are currently no national gas emission regulations for diesel power generators. The municipal authority of So Paulo ordered that improvements must be made to reduce emissions from these machines in order to reduce emissions in the city. EGR systems are a simple mechanical modification that may be used to minimize NOX emissions from diesel power generators.
Do all diesel trucks have EGR?
All modern diesel engines have EGR valves, which perform exactly what they say on the tin: they recirculate exhaust gasses. In order to reduce harmful NOx emissions, hot exhaust gases from the engine are pumped back into the input manifold.