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Topic: Exhaust gas recirculation

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	Exhaust gas recirculation: Just the facts... (Site not responding. Last check: 2007-09-19)
		EGR works by recirculating a quantity of exhaust gas (additional info and facts about exhaust gas) back to the engine cylinder (A surface generated by rotating a parallel line around a fixed line) s.
		Recirculation is usually achieved by piping a route from the exhaust manifold (A manifold that receives exhaust gases from the cylinders and conducts them to the exhaust pipe) to the inlet manifold (Manifold that carries vaporized fuel from the carburetor to the inlet valves of the cylinders).
		In modern diesel engines, the EGR gas is cooled through a heat exchanger (Device that transfers heat from one liquid to another without allowing them to mix) to allow the introduction of a greater mass of recirculated gas.
	www.absoluteastronomy.com /encyclopedia/e/ex/exhaust_gas_recirculation.htm (167 words)

	RepairNation.com - Automotive Encyclopedia: E
		Exhaust headers manufacturers use separate tubes for each exhaust port on the engine and attempt to create a smoother flow of gasses out of an engine by "tuning" the lengths of each pipe to the engine's exhaust pulses.
		Generally the exhaust manifold must be specially prepared which usually includes sandblasting, degreasing, then the paint must be cured according to special process which may involve slow baking in an oven (that's not a joke).
		During the exhaust stroke, the exhaust valve is opened and the piston travels upward pushing the gasses out of the cylinder.
	www.repairnation.com /automotive_encyclopedia/page_e.htm (3858 words)

	Exhaust gas recirculation - Wikipedia, the free encyclopedia
		Recirculation is usually achieved by piping a route from the exhaust manifold to the inlet manifold, which is called external EGR.
		Some engine designs perform EGR by trapping exhaust gas within the cylinder by not fully expelling it during the exhaust stroke, which is called internal EGR.
		EGR can also be used by using a variable geometry turbocharger (VGT) which uses variable inlet guide vanes to build sufficient back pressure in the exhaust manifold.
	en.wikipedia.org /wiki/EGR (316 words)

	[No title] (Site not responding. Last check: 2007-09-19)
		Third, the amount of exhaust gases that are recirculated can be controlled by modifying the timing, and the magnitude, of the opening of the exhaust valve that is being actuated to accomplish exhaust gas recirculation to obtain optimal mixing of gas and recirculated gas.
		The lifts of the exhaust valve actuated by valve float, compression release retarder, exhaust gas recirculation are shown in the accompanying figures.
		The mass of gas recirculated into the cylinder for each event a, b, and c, is proportional to the area under the manifold pressure plot 1600 corresponding with the opening and closing of the valve for each of the events a, b, and c.
	www.wipo.int /cgi-pct/guest/getbykey5?KEY=98/34021.980806&ELEMENT_SET=DECL (14526 words)

	United States Patent Application: 0040148087
		The method according to claim 1, wherein the exhaust gas recirculation rate of the exhaust gas recirculated via the exhaust gas recirculation pipe is calculated from the exhaust gas recirculation mass flow determined in each case in accordance with the method and the fresh air mass flow measured in each case by forming a ratio.
		The so-called exhaust gas recirculation rate, that is to say the ratio between the intake fresh air mass flow and the exhaust gas recirculation mass flow, is also important with regard to compliance with the vehicle exhaust regulations.
		The exhaust gas recirculation rate of the exhaust gas recirculated via the exhaust gas recirculation pipe can be calculated from the exhaust gas recirculation mass flow determined in each case in accordance with the method and the fresh air mass flow measured in each case by forming a ratio.
	appft1.uspto.gov /netacgi/nph-Parser?Sect1=PTO1&Sect2=HITOFF&d=PG01&p=1&u=/netahtml/PTO/srchnum.html&r=1&f=G&l=50&s1="20040148087".PGNR.&OS=DN/20040148087&RS=DN/20040148087 (2434 words)

	[No title] (Site not responding. Last check: 2007-09-19)
		The exhaust gas recirculation should mainly decrease the combustion temperature to reduce the harmful nitrogen dioxide in the exhaust gases.
		Internal exhaust gas recirculation is possible with an increased valve overlap, while adjusting the camshaft or the electric/hydraulic valve control.
		During full load the exhaust gas recirculation must be ceased to ensure the surplus of oxygen, because the engine would soot.
	www.kfz-tech.de /Engl/Abgasrueckfuehrung.htm (192 words)

	Understanding exhaust gas recirculation systems
		Exhaust gas recirculation (EGR) systems were introduced in the early '70s to reduce an exhaust emission that was not being cleaned by the other smog controls.
		Vacuum flows to the EGR in rapid on-off pulses as the solenoid is commanded by the PCM.
		The EGR is considered malfunctioning when an EGR component fails or a fault in the flow rate results in the vehicle exceeding the Federal Test Procedure (FTP) by 1.5 times.
	www.asashop.org /autoinc/nov97/gas.htm (1693 words)

	Exhaust gas recirculation -- Exhaust gas recirculation (EGR) Is an efficient... (Site not responding. Last check: 2007-09-19)
		Exhaust gas recirculation (EGR) Is an efficient NOX (Nitrogen oxide and Nitrogen Dioxide) reduction technique used in most Gasoline and Diesel engines.
		EGR is usually achieved by a piping route from the exhaust manifold to the inlet manifold.
		In a modern diesel engine it is likely that the EGR gas is also cooled through a heat exchanger to further cool the gas, and thus the combustion, and to allow the introduction of a greater mass of recirculated gas.
	exhaust-gas-recirculation.en.tracking24.net (188 words)

	Exhaust gas recirculation (Site not responding. Last check: 2007-09-19)
		Exhaust gas recirculation (EGR) was an early and primitive automobile emissions-control device that was used from the late 1960s through the early 1980s.
		The EGR equipment is sometimes casually referred to as a pollution pump or smog pump, although these terms may also refer to an air injection reactor (AIR) system, another early pollution control method.
		Pertaining to steam, air, gas, etc., that is released from the cylinder of an engine after having preformed its work.
	www.serebella.com /encyclopedia/article-Exhaust_gas_recirculation.html (709 words)

	Exhaust gas recirculation means - Patent 4114370
		Exhaust manifold 30 is adapted to carry exhaust gases away from the engine block 30, through a muffler 32, for eventual disposal thereof.
		To insure that a significant pressure drop does not occur in the system 17 as the exhaust gases are passing through the various filtering means from the separator 42 to the carburetor assembly 20, the various sections of tubing, 72, 85, 89 and 73, 86, 90, may be formed with particular relative diameters.
		After exhaust gases are inertially classified by passing through the horizontally disposed means 37, the heavier and lighter components are separated by skimmer 42 and are passed through lines 111 and 110 respectively, the lines 110, 111 of nylon or the like.
	www.freepatentsonline.com /4114370.html (5071 words)

	Malfunction detection of an engine exhaust gas recirculation system - Patent 4879986
		Malfunctions in an exhaust gas recirculation system, particularly on manual transmission vehicles which may be accelerated during a startup period with a rapid succession of upshifts during which exhaust gas recirculation is suspended, is detected from the output of a thermistor positioned on the passageway of the recirculating exhaust gas.
		Whether the exhaust gas is recirculating as required or not is ascertained from the temperature of the exhaust gas passageway.
		Forming a part of the EGR malfunction detection system 40 is a temperature sensor 42, which typically takes the form of a thermistor, provided on the exhaust gas recirculation line 24 for measuring the temperature of the exhaust gas being recirculated or of the exhaust gas passageway itself.
	www.freepatentsonline.com /4879986.html (3927 words)

	Exhaust Gas Recirculation Solenoid Valve Diagnostics Tightrope Technologies Ireland
		By recycling a small amount of exhaust gas the combustion charge temperature is lowered and there is a reduction in NOx.
		The EGR valve is a small mechanical device that allows the passage of exhaust gas when it receives a vacuum supply.
		It is therefore necessary to monitor the amount of exhaust gas that enters the inlet manifold.
	www.ttmtechnical.com /exhaust_gas_recirculation.html (927 words)

	Scania EGR (Exhaust Gas Recirculation)
		EGR is a tried-and-proven solution that has been used on heavy vehicles in the US and on cars and light commercial vehicles all over the world for many years.
		Some of the exhaust gases are cooled and fed back into the engine to achieve a lower combustion temperature.
		Scania EGR effectively reduces emissions in all conditions, including highway driving and long-haulage, as well as low speed stop-and-go as in urban areas.
	www.scania.com /products/newtruckrange/technology/Scania_EGR/EGR.asp (231 words)

	12v Pages - The Engine - MMS200 (Site not responding. Last check: 2007-09-19)
		The Exhaust Gas Recirculation is controlled by the ignition map in the MPI control unit.
		An EGR Frequency Valve (N18) is connected to the intake manifold and operated by the MPI control unit.
		The sensor measures the temperature of the recirculated exhaust gas.
	www.12v.org /engine/index.php?section=hw&ver=2&sm=m2&sc=egr (283 words)

	Exhaust Gas Recirculation (EGR) System Monitor
		This then through intake vacuum draws in exhaust gas whose flow is measured by the Differential Pressure Feedback sensor which generates a reference voltage based on exhaust gas flow.
		A voltage increase or decrease during acceleration while the EGR valve is closed may indicate a fault with the signal hose during this test.
		The EGR flow rate test is performed during a steady state when engine speed and load are moderate and EGR Vacuum Regulator duty cycle is high.
	www.v8sho.com /SHO/ExhaustGasRecirculation(EGR)SystemMonitor.htm (553 words)

	ETEC Proprietary Induced Flue Gas Recirculation Systems For NOx Control (Site not responding. Last check: 2007-09-19)
		Recirculating flue gas back to the combustion zone has been one of the most effective methods of reducing NOx emissions from gas and oil fired boilers since the early 1970's.
		In conventional applications, the recirculated flue gas is typically extracted from the boiler outlet duct upstream of the air heater.
		WFGR systems require installation of a separate hot gas FGR fan to move flue gas from the boiler exit to the air supply ducting at the windbox inlet, where mixing of the air and flue gas must be uniformly achieved by installation of appropriate mixing devices.
	www.etecinc.net /index.cfm?area=ip&ip_page=ip&cat_id=4 (726 words)

	InsightCentral.net - Encyclopedia - Honda Insight Exhaust Recirculation System
		The Insight uses a linear-solenoid-operated EGR valve that feeds recirculated exhaust gas into an equal-length EGR manifold that is sandwiched between the intake manifold and the cylinder head.
		This design ensures equal distribution of recirculated exhaust gas between the three cylinders and prevents the exhaust gas from liquefying before reaching the intake ports.
		This high-precision EGR system is required to help control NOx production during lead-burn operation.
	www.insightcentral.net /encyclopedia/enegr.html (76 words)

	Engine builders prepare October emission changes
		The Mack solution is to use a variable geometry turbocharger to force exhaust gas to mix with fresh intake air for use in combustion.
		Volvo's design moves exhaust gas through the EGR valve using the energy already in the exhaust stream by trapping the high-pressure release that occurs when exhaust valves in the cylinder head open following combustion.
		Coolant and exhaust gas will move through the heat exchanger in the same direction, extending the time of contact for optimum heat extraction from the gas.
	www.bulktransporter.com /mag/transportation_engine_builders_prepare_2/index.html (2338 words)

	EFI: Exhaust gas recirculation (Site not responding. Last check: 2007-09-19)
		The exhaust gas recirculation (EGR) system is used to reduce the amount of NOx created by the engine.
		It does this by diluting the air/fuel mixture with a small amount of inert gas (usually less than 10% of the total mixture); exhaust gas is used since it contains only a small amount of oxygen (and is readily available).
		This is close to the most complicated EGR you'll run across; it has a computer controlled vacuum solenoid and a position sensor.
	www.xse.com /leres/efidiag/egr.html (337 words)

	Cummins Details Progress in Exhaust Gas Recirculation -- EGR -- Technology
		COLUMBUS, Ind.--March 5, 2001--Cummins Inc. announced that it has achieved an important milestone in the development of cooled exhaust gas recirculation (EGR) technology required to meet future emissions requirements, which are legislated at 2.5 grams oxides of nitrogen (NOx) plus non-methane hydrocarbon (NMHC).
		This technology was successfully demonstrated on the next generation of the Cummins B series engine and is also being applied to its other medium-duty and heavy-duty products, which are currently in field test.
		Exhaust gas recirculation technology allows for a portion of exhaust gas to be reused, effectively reducing exhaust emissions.
	www.theautochannel.com /news/2001/03/05/015976.html (587 words)

	[No title] (Site not responding. Last check: 2007-09-19)
		The EGR valve is controlled by carburetor vacuum, and accordingly opens and closes to admit exhaust gases into the fuel/air mixture.
		Hg, the EGR valve opens and some of the exhaust gases are allowed to flow into the air/fuel mixture to lower the combustion temperature.
		This valve further limits the exhaust gas opening (compared to the single diaphragm EGR valve) during high intake manifold vacuum periods, such as high-speed cruising, and provides more exhaust gas recirculation during acceleration when manifold vacuum is low.
	www.autozone.com /servlet/UiBroker?ForwardPage=/az/cds/en_us/0900823d/80/1a/22/de/0900823d801a22de.jsp (621 words)

	TheDieselStop.Com Forums: Exhaust Gas Recirulation - ??
		what the egr does is introduce a small amount of exhaust into the incoming air charge to dilute the oxygen content in the air charge.
		The series 60 engine has an exhaust cooler that cools the temps to a lesser degree before it is mixed in the intake system.
		This type of egr has been around since the early 80's (lots of american cars use this type of egr), but a cam profile that allows this is not conducive to making power.
	www.thedieselstop.com /archives/ubbthreads/GeneralDiesel1/showflat.php-Cat=&Number=1327757&page=25&view=collapsed&sb=5&o=&fpart=1.htm (1002 words)

	Re: Exhaust gas recirculation in diesel engines
		Some of the power thus produced is used to prepare the cylinders for the next explosion by forcing the exhaust gases out of the cylinder, drawing in air (or fuel-air mixture in non-diesel engines), and compressing the air or fuel-air mixture before the fuel is ignited.
		The goal of exhaust gas recirculation is to reduce the amount of NOx produced.
		Exhaust gas recirculation does two of these by taking some of the exhaust gas and mixing it into the engine inlet air.
	www.madsci.org /posts/archives/mar2001/985978960.Eg.r.html (698 words)

	Effect of Exhaust Gas Recirculation and Fuel-Water-Emulsion on Combustion and Pollutant Formation in a Diesel Engine (Site not responding. Last check: 2007-09-19)
		Exhaust gas recirculation and fuel-water emulsion are well known methods to reduce nitrogen oxide emissions of diesel engines simultaneously affecting the particulates.
		Parameters to evaluate mixture formation and combustion processes for exhaust gas recirculation and fuel-water emulsion could be derived from thermodynamic analysis, optical combustion investigations and measurements of exhaust pollutants.
		Nitrogen oxides reduction is caused by the drop of flame temperature due to the increased inert gas fraction in the combustion zone in both methods.
	www.dieselengine.de /abstract18.htm (272 words)

	Engine builders prepare October emission changes
		DDC has been producing the Series 50 with exhaust gas recirculation for two years and has 3,500 of the engines in service.
		Exhaust gas recirculation is wonderful for reducing emissions because it reduces combustion temperature.
		The exhaust gas cooler is split into two sections as well, Vance said.
	www.refrigeratedtrans.com /mag/transportation_engine_builders_prepare/index.html (2338 words)

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