Optimization of oil mist separation within the complete crankcase ventilation system

2017 ◽  
pp. 241-259
Author(s):  
Stefan Ruppel ◽  
Daniel Schatz ◽  
Michael Wöhler ◽  
Alfred Elsäßer
Keyword(s):  
Ventilation System ◽  
Crankcase Ventilation ◽  
Oil Mist

Blow-By Truck Application: Electrically Driven Cone Stack Separator for Crankcase Ventilation

2007 ◽  
Author(s):  
Gerd Kissner ◽  
Hartmut Sauter
Keyword(s):  
Separation Efficiency ◽  
Ventilation System ◽  
Motor Vehicles ◽  
Cylinder Wall ◽  
Oil Consumption ◽  
Control Laws ◽  
Crankcase Ventilation ◽  
Oil Fraction ◽  
Air Intake ◽  
Oil Mist

Dealing with the blow-by gas from reciprocating engine is a bigger challenge nowadays due to strict emission control laws and design limitations. Blow-by gas originates between the piston or piston rings and the cylinder wall and is charged with oil when it leaves the crankcase. In a closed crankcase ventilation system these blow-by gases are drawn from the crankcase into the air intake. The oil mist separator (OMS) retains a fraction of the liquid oil and returns the retained oil fraction back to the oil sump. Thus, the oil mist separator reduces oil consumption and emissions. Electrically driven cone stack separators have high separation efficiency, small differential pressure, arbitrary mounting position and low power consumption. In addition to that, the electrically driven cone stack separator has also advantageous control characteristics. Since commercial motor vehicles already have high electrical system requirements a Mechatroic concept is presented here which was developed to be maintenance-free over the lifetime of the engine. This is achieved by detailed design and choice of special materials. In this paper, the construction and application of the novel oil mist separator system for trucks are discussed in detail.

Liner Design to Reduce Unburned Hydrocarbon Exhaust Emissions

2018 ◽  
Author(s):  
Paul S. Wang ◽  
Allen Y. Chen
Keyword(s):  
Natural Gas ◽  
Ventilation System ◽  
Hydrocarbon Emissions ◽  
Tracer Technique ◽  
Oil Consumption ◽  
Natural Gas Engines ◽  
Unburned Hydrocarbon ◽  
Crankcase Ventilation ◽  
Unburned Fuel ◽  
Careful Design

Large natural gas engines that introduce premixed fuel and air into the engine cylinders allow a small fraction of fuel to evade combustion, which is undesirable. The premixed fuel and air combust via flame propagation. Ahead of the flame front, the unburned fuel and air are driven into crevices, where conditions are not favorable for oxidation. The unburned fuel is a form of waste and a source of potent greenhouse gas emissions. A concept to vent unburned fuel into the crankcase through built-in slots in the liner during the expansion stroke has been tested. This venting process occurs before the exhaust valve opens and the unburned fuel sent into the crankcase can be recycled to the intake side through a closed crankcase ventilation system. The increased communication between the cylinder and the crankcase changes the ring pack dynamics, which results in higher oil consumption. Oil consumption was measured using a sulfur tracer technique. Careful design is required to achieve the best tradeoff between reductions in unburned hydrocarbon emissions and oil control.

Highly effective oil mist separator for crankcase ventilation

MTZ worldwide ◽  
2003 ◽  
Vol 64 (3) ◽  
pp. 6-8 ◽  
Author(s):  
Hartmut Sauter ◽  
Kay Brodesser ◽  
Dieter Brüggemann
Keyword(s):  
Crankcase Ventilation ◽  
Highly Effective ◽  
Oil Mist

Analysis of the effect of a closed crankcase ventilation system on the fuel efficiency of a compression ignition engine

2020 ◽  
Vol 1 (3) ◽  
pp. 3-9
Author(s):  
S.M. Andriyanov ◽  
◽  
A.A. Matveyev ◽  
V.N. Nikishin ◽  
L.I. Fardeyev ◽  
...  
Keyword(s):  
Fuel Efficiency ◽  
Ventilation System ◽  
Compression Ignition ◽  
Compression Ignition Engine ◽  
Crankcase Ventilation

On Blow-by Aerosol Sources in a Single-Cylinder Crankcase Environment

2021 ◽  
Author(s):  
N. Nowak ◽  
K. Scheiber ◽  
C. Stieler ◽  
M. T. Heller ◽  
J. Pfeil ◽  
...  
Keyword(s):  
Ventilation System ◽  
Formation Mechanisms ◽  
Minor Effect ◽  
Piston Rings ◽  
Bulk Oil ◽  
Single Cylinder ◽  
Aerosol Generation ◽  
Crankcase Ventilation ◽  
Aerosol Sources ◽  
Peak Pressures

Abstract Crankcase aerosol contributes to the particulate matter (PM) emissions of combustion engines equipped with an open crankcase ventilation system. In case of closed crankcase ventilation, the aerosol forms deposits that diminish engine efficiency, performance, and reliability. Such issues are best avoided by highly efficient filters combined with in-engine reduction strategies based on a quantitative understanding of aerosol sources and formation mechanisms in a crankcase environment. This paper reports key findings from a study of aerosol spectra in the range of 0.01 μm to 10 μm obtained from a 1.3-L single-cylinder engine under well-defined conditions. Supermicron particles were formed mainly by cooling jet break-up when the piston was positioned in TDC, while at BDC aerosol generation decreased by about 90 % because the oil jet was short and thus stable. Motoring the engine yielded an additional peak around 0.7 μm. It is associated with oil atomization at the piston rings and increased strongly with cylinder peak pressure. No significant contribution of the bearings could be identified at peak pressures below 116 bar. Engine speed had only a minor effect on aerosol properties. Operating the engine in fired mode increased the submicron aerosol concentration substantially, presumably because high(er) peak pressures boost aerosol generation at the piston rings, and because additional particles may have formed from recondensing oil vapor generated at hotspots. Soot or ash aerosols could not be identified in the crankcase aerosol, because they may have been integrated into the bulk oil.

Optimizing Crankcase Ventilation System of Gasoline Engine

2011 ◽  
Vol 58-60 ◽  
pp. 171-176
Author(s):  
Ming Jiang Hu
Keyword(s):  
Gasoline Engine ◽  
Ventilation System ◽  
Flow Characteristics ◽  
Gas Leakage ◽  
Working Model ◽  
Crankcase Ventilation ◽  
Analog Control ◽  
Test Platform ◽  
Fluid Properties ◽  
Test Result

Based on the design goals of the gasoline engine crankcase ventilation system, the features and the layout were described on the gasoline engine crankcase ventilation system, the working model was established on the gasoline engine crankcase ventilation system; using the fluid properties and the mathematical calculation method, the optimizing strategy was proposed on the piston gas leakage, the influencing factors were analyzed on the gasoline engine crankcase vacuum, the design strategy of the flow characteristics was developed on the PCV valve. Using analog control test platform of the gasoline engine, the tests were made on the piston gas leakage, the crankcase vacuum and PCV valve flow characteristics of the gasoline engine crankcase ventilation system. The test result showed that the optimized maximum piston leakage flow was 14L/min; the increasing rates of the optimized intake pipe and crankcase vacuum average were according 5.6% and 8.0%. This could indicate that the working model on the gasoline engine crankcase ventilation system was correct; the proposed strategies on the piston gas leakage, the crankcase vacuum and PCV valve flow characteristics were feasible in the gasoline engine crankcase ventilation system.

The AC Dual ACtion Crankcase Ventilation System

1963 ◽  
Author(s):  
G. R. Fitzgerald ◽  
D. B. Lewis
Keyword(s):  
Ventilation System ◽  
Crankcase Ventilation ◽  
Dual Action
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