Most EGR systems include the following main hardware components:. The condensate is removed from the EGR system 22 by positioning at least one collecting vessel 48 in fluid communication with the EGR cooler 24the cooled passage 40the intake air line 42the intake manifold 44or anywhere else between the EGR cooler and the engine The recirculated portion of the exhaust gas is cooled such that, under at least some operating conditions, condensation forms. In such an embodiment, the ECU 58 may need to calculate, for example, what the temperature of the condensation reservoir 92 is. One way to keep droplets from hitting the compressor wheel in a critical area is to have the droplets permanently removed from the mass flow going into the compressor wheel under all driving conditions. The buffer tank ensures a constant flow of water to the scrubber. The recirculated portion of the exhaust gas reduces the concentration of oxygen therein, thus lowering the combustion temperature, slowing the chemical reactions, and decreasing the formation of NOx.
However, instead of a pump, many of these systems ended up using a hybrid Position of valves 1, 2 & 3 is typical for LP EGR operation at high engine speeds and loads.
USB2 Power system comprising a condensation injection system Google Patents
. The more condensate is formed due to EGR cooling, the more likely. In an engine equipped with a Low Pressure Loop (LPL) EGR system. require a pump to purge the condensate reservoir. A better choice is to.
EGR Systems & Components
2% – 3% over drive cycles through pumping and heat loss reduction, and up to 16% or condensation limitations as exhaust gases flow through the LP-EGR.
To illustrate, if the determined power level is relatively high, then the ECU 58 may, for example, adjust the condensation injector 34 to remain open for a relatively long period of time for a given injection, so as to lower the NOx levels in the exhaust, which tend to be relatively high during times when the determined power is also relatively high.
In a low pressure EGR systemthe exhaust gas is taken after the turbine and reintroduced into the intake manifold before the compressor, thus in the low pressure zone of both exhaust and intake manifolds. Exemplarily, the ECU 58 may have four primary functions: 1 converting analog sensor inputs to digital outputs, 2 performing mathematical computations for all fuel and other systems, 3 performing self diagnostics, and 4 storing information.
USA1 Mixing Unit for LPEGR Condensate Into the Compressor Google Patents
Country of ref document : JP. The adjustment may depend on, for example, the ECU 58 being configured to determine a desired pulse width of the condensation injector 34 by retrieving the desired pulse width from a table of values indexed by the signal indicative of the condensation level.
Another problem is that under some other operating conditions, there may be so much condensation that it may form pools and rivers.
Low pressure egr condensation pump
|However, it should be noted that incorporating the use of a venturi 76 into the intake pipe 44 will necessitate the use of a larger venturi The venturi 76 is designed in such a way that pressure drop of the intake air 41 flowing through the venturi 76 is minimized.
Under at least some operating conditions, the recirculated portion of the exhaust gas is cooled, in the EGR cooler 70to such an extent that condensation forms. The control orifice 52 selectively permits the condensate to flow through the condensate evacuation line 50 to the mixer 18but prevents the flow of exhaust gas through the condensate evacuation line to the EGR cooler A plurality of intake valves 24 may be positioned upstream of the plurality of cylinders 21and a plurality of exhaust valves 28 may be positioned downstream of the plurality of cylinders
of the negative pressure drop to atmosphere (pumping would be necessary). Also. A cooled EGR passage is downstream of the EGR cooler, and an air intake line is F02B37/00 Engines characterised by provision of pumps driven at least for part In general, engines using EGR to lower their NOx emissions can attain lower. The evacuation of EGR gas may result in the loss of pressure and flow of the.
Low Pressure and High Pressure EGR Pumping losses at different HP/LP-EGR-splits Switching between HP-EGR and LP-EGR to avoid condensation.
The other larger scroll can be optimized for scavenging of the other three cylinders . Supercharging air compressor for an internal combustion engine, internal combustion engine and method for that purpose.
The cooled exhaust gas has a lower latent heat content and can aid in lowering combustion temperatures even further. The exhaust gas with droplets 54 is brought to the middle of the intake tube 44 into the mixing pipe 52 of a diameter optimized for the maximum amount of EGR to be introduced.
WOA1 Exhaust gas recirculation with condensation control Google Patents
The exhaust system 12 receives a first portion of the exhaust gas from the engine Referring to FIG.
Low pressure egr condensation pump
|The exhaust gas also increases the specific heat capacity of the mix, which lowers the peak combustion temperature.
Disclosed is a power system comprising an internal combustion engine. CNB en. The EGR then passes to the intake manifold where it mixes with cooled charge air before being inducted into the engine.
In a nutshell, D-EGR technology delivers cooled recirculated exhaust gas and reformed fuel in the same package.
F02M26/47 Sensors specially adapted for EGR systems for determining the . Alliedsignal Inc.
Exhaust Gas Recirculation (EGR) complete guide – architectures –
Exhaust gas recirculation system employing a fluidic pump . USB1 Low pressure EGR system for diesel engines. Tutorial on the types of EGR systems, low pressure EGR, high pressure EGR, water condensation can cause erosion (physical damage) of the compressor of combustion temperature; reduce pumping losses, which translates in higher.
Here, the plurality of condensation injectors 38 inject condensation directly into the plurality of cylinders 21and the condensation and the intake gas mix in the plurality of cylinders EPA1 en. A fourth exhaust passage 38 on the EGR system 22 permits the fluid communication of the exhaust manifold 28 with the EGR cooler Connected to the intake tube 44 is EGR-tube
Low pressure egr condensation pump
|Condensation reduction in the exhaust gas recirculation EGR system of a compression ignition i.
Video: Low pressure egr condensation pump condensate pump not pumping
Please log in to view the complete version of this paper. The EGR system 12 receives a second portion of the exhaust gas from the engine The exhaust gas return arrangement of claim 5wherein said venturi causes a pressure drop through said first passageway, enhancing the introduction of said exhaust gas with droplets into said third passageway. Additionally, a plurality of exhaust ports 52 may also be formed into the engine head Embodiments described herein relate generally to exhaust gas recirculation EGR systems in vehicles.
Method and arrangement for exhaust-gas recirculation in an internal combustion engine.
Video: Low pressure egr condensation pump Diesel Engine EGR Explained