Advanced Diesel Combustion Using of Wide Range, High Boosted and Cooled EGR System by Single Cylinder Engine

2006 ◽  
Author(s):  
Yuzo Aoyagi ◽  
Hideaki Osada ◽  
Masahiro Misawa ◽  
Yuichi Goto ◽  
Hajime Ishii
Keyword(s):  
Diesel Combustion ◽  
Single Cylinder ◽  
Single Cylinder Engine ◽  
Wide Range

A Transient Single Cylinder Test System for Engine Research and Control Development

2005 ◽  
Author(s):  
John L. Lahti ◽  
Matthew W. Snyder ◽  
John J. Moskwa
Keyword(s):  
Test System ◽  
Intake Manifold ◽  
Test Accuracy ◽  
Test Configuration ◽  
Single Cylinder ◽  
Cylinder Test ◽  
Single Cylinder Engine ◽  
Wide Range ◽  
Reduce Development Time ◽  
High Bandwidth

A transient test system was developed for a single cylinder research engine that greatly improves test accuracy by allowing the single cylinder to operate as though it were part of a multi-cylinder engine. The system contains two unique test components: a high bandwidth transient hydrostatic dynamometer, and an intake airflow simulator. The high bandwidth dynamometer is used to produce a speed trajectory for the single cylinder engine that is equivalent to that produced by a multi-cylinder engine. The dynamometer has high torque capacity and low inertia allowing it to simulate the speed ripple of a multi-cylinder engine while the single cylinder engine is firing. Hardware in loop models of the drivetrain and other components can be used to test the engine as though it were part of a complete vehicle, allowing standardized emissions tests to be run. The intake airflow simulator is a specialized intake manifold that uses solenoid air valves and a vacuum pump to draw air from the manifold plenum in a manner that simulates flow to other engine cylinders, which are not present in the single cylinder test configuration. By regulating this flow from the intake manifold, the pressure in the manifold and the flow through the induction system are nearly identical to that of the multi-cylinder application. The intake airflow simulator allows the intake runner wave dynamics to be more representative of the intended multi-cylinder application because the appropriate pressure trajectory is maintained in the intake manifold plenum throughout the engine cycle. The system is ideally suited for engine control development because an actual engine cylinder is used along with a test system capable of generating a wide range of transient test conditions. The ability to perform transient tests with a single cylinder engine may open up new areas of research exploring combustion and flow under transient conditions. The system can also be used for testing the engine under conditions such as cylinder deactivation, fuel cut-off, and engine restart. The improved rotational dynamics and improved intake manifold dynamics of the test system allow the single cylinder engine to be used for control development and emissions testing early in the engine development process. This can reduce development time and cost because it allows hardware problems to be identified before building more expensive multi-cylinder engines.

High EGR Diesel Combustion and Emission Reduction Study by Single Cylinder Engine

2004 ◽  
Vol 2004.3 (0) ◽  
pp. 139-140 ◽  
Author(s):  
Masahiro MISAWA ◽  
Yuzo AOYAGI ◽  
Masayuki KOBAYASHI ◽  
Matsuo ODAKA ◽  
Yuichi GOTO
Keyword(s):  
Emission Reduction ◽  
Diesel Combustion ◽  
Single Cylinder ◽  
Single Cylinder Engine

scholarly journals Measurement of flame temperature and soot amount for effective NOx and PM reduction in a heavy duty diesel engine

2019 ◽  
Vol 179 (4) ◽  
pp. 32-39
Author(s):  
Yuzo AOYAGI
Keyword(s):  
Diesel Engine ◽  
Combustion Chamber ◽  
High Speed ◽  
Flame Temperature ◽  
Video Camera ◽  
Boost Pressure ◽  
Diesel Combustion ◽  
Single Cylinder ◽  
Wide Range ◽  
Kl Factor

To reduce exhaust NOx and smoke, it is important to measure flame temperature and soot amount in combustion chamber. In diesel combustion it is effective to use the two-color method for the measurement of the flame temperature and KL factor, which is related with soot concentration. The diesel flame was directly and continuously observed from the combustion chamber at running engine condition by using a bore scope and a high-speed video camera. The experimental single cylinder engine has 2.0-liter displacement and has the ability with up to five times of the boost pressure than the naturally aspirated engine by external super-charger. The devices of High Boost, Wide Range and High EGR rate at keeping a relatively high excess air ratio were installed in this research engine in order to reduce exhaust NOx emission without smoke deterioration from diesel engines. The video camera nac GX-1 was used in this study. From observed data under the changing EGR rates, the flame temperature and KL factor were obtained by the software of two-color method analysis. The diesel combustion processes are understood well by analyzing high-speed movies of the diesel flame motion and its temperature. The NOx and smoke are mutually related to maximum flame temperature and also it is possible to reduce simultaneously both NOx and soot emissions by high EGR rate in a single cylinder diesel engine.

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