Achievement of Medium Engine Speed and Load Premixed Diesel Combustion with Variable Valve Timing

2006 ◽  
Author(s):  
Yutaka Murata ◽  
Jin Kusaka ◽  
Matsuo Odaka ◽  
Yasuhiro Daisho ◽  
Daisuke Kawano ◽  
...  
Keyword(s):  
Engine Speed ◽  
Variable Valve Timing ◽  
Diesel Combustion ◽  
Valve Timing ◽  
Variable Valve

Experimental Study on an Electric Variable Valve Timing Actuator: Linear Parameter Varying Modeling and Control

2017 ◽  
Vol 139 (10) ◽  
Author(s):  
Ali Khudhair Al-Jiboory ◽  
Guoming G. Zhu ◽  
Shupeng Zhang
Keyword(s):  
System Identification ◽  
Engine Speed ◽  
Gain Scheduling ◽  
Variable Valve Timing ◽  
Linear Parameter ◽  
Valve Timing ◽  
Battery Voltage ◽  
Linear Parameter Varying ◽  
Variable Valve ◽  
And Control

This paper presents experimental investigation results of an electric variable valve timing (EVVT) actuator using linear parameter varying (LPV) system identification and control. For the LPV system identification, a number of local system identification tests were carried out to obtain a family of linear time-invariant (LTI) models at fixed engine speed and battery voltage. Using engine speed and battery voltage as time-varying scheduling parameters, the family of local LTI models is translated into a single LPV model. Then, a robust gain-scheduling (RGS) dynamic output-feedback (DOF) controller with guaranteed H∞ performance was synthesized and validated experimentally. In contrast to the vast majority of gain-scheduling literature, scheduling parameters are assumed to be polluted by measurement noises and the engine speed and battery voltage are modeled as noisy scheduling parameters. Experimental and simulation results show the effectiveness of the developed approach.

Achievement of Medium Speed and Load Premixed Diesel Combustion With Variable Valve Timing

2005 ◽  
Author(s):  
Yutaka Murata ◽  
Daisuke Kawano ◽  
Jin Kusaka ◽  
Yasuhiro Daisho ◽  
Hisakazu Suzuki ◽  
...  
Keyword(s):  
Variable Valve Timing ◽  
Diesel Combustion ◽  
Valve Timing ◽  
Medium Speed ◽  
Variable Valve

Analysis of Optimum Valve Timing Based on Diesel Engine Comprehensive Performance

2011 ◽  
Vol 347-353 ◽  
pp. 4118-4124
Author(s):  
Ming Ming Wang ◽  
Ren Xian Li
Keyword(s):  
Fuel Economy ◽  
High Speed ◽  
Engine Speed ◽  
Variable Valve Timing ◽  
Valve Timing ◽  
Power Performance ◽  
Emission Performance ◽  
Performance And Emission ◽  
Comprehensive Performance ◽  
Variable Valve

In order to investigate the effect of variable valve timing on engine power performance, fuel economy performance and emission performance quantitatively, proceed to optimize it, a high speed diese Specific Fuel Consumption, quantity of NOx and Soot, mass of fresh charge were calculated by 3-D CFD method l engine contains variable valve timing system (VVT) was researched. The effective power, at 6 speeds conditions which valve timing parameters were modulated. A method of calculating CRG was suggested. The results indicate that exhaust advance angle has a little impact on sweep and emission performance, but a big impact on ventilation losses. The optimum exhaust advance angle should be increased as engine speed rises. Increasing intake lag angle in low engine speed could increase coefficient of charge, thereby increase power performance and fuel economy performance. Comprehensive performance could be increased by decreasing intake delay angle under high speed.

Simulation and Analysis of Variable Valve System Based on Diesel Engine

2014 ◽  
Vol 556-562 ◽  
pp. 1271-1277 ◽  
Author(s):  
Long Yin ◽  
Dong Jian Zeng ◽  
Yi Zeng Peng
Keyword(s):  
Diesel Engine ◽  
Simulation Model ◽  
Engine Speed ◽  
Drive System ◽  
Variable Valve Timing ◽  
Valve Timing ◽  
Experiment Data ◽  
Valve System ◽  
Valve Drive ◽  
Variable Valve

The necessity and superiority of using variable valve system on diesel is described detailed. The design of electro-hydraulic variable valve drive system is introduced based on DK4A diesel engine, then the mathematical simulation model of the electro-hydraulic variable valve drive system is undertook by Simulink in order to study the movement of the intake valve. The results show the design of variable valve system can achieve the variable valve timing continuous vary in different engine speed and respond quickly. Further, the simulation model of the diesel engine is built by GT-POWER, and then the accuracy of the model is verified according to the experiment data. Lastly the intake performance of the variable valve system in different out flowing phase is analyzed through the GT-POWER model. The results show that when the engine speed at 2000RPM, 2800RPM, 3600RPM, out flowing phase behind 60oCA, 45oCA, 35oCA after intake TDC respectively ,the amount of intake air decreases with the increase of the out flowing phase, the amount of intake air has been effectively controlled by variable valve system.

3108 Control of Ignition Timing of Premixed Diesel Combustion with Variable Valve Timing

2005 ◽  
Vol 2005.3 (0) ◽  
pp. 55-56
Author(s):  
Yutaka MURATA ◽  
Daisuke KAWANO ◽  
Jin KUSAKA ◽  
Yasuhiro DAISHO ◽  
Hisakazu SUZUKI ◽  
...  
Keyword(s):  
Variable Valve Timing ◽  
Diesel Combustion ◽  
Valve Timing ◽  
Ignition Timing ◽  
Variable Valve

Emissions suppression mechanism of premixed diesel combustion with variable valve timing

2007 ◽  
Vol 8 (5) ◽  
pp. 415-428 ◽  
Author(s):  
Y Murata ◽  
J Kusaka ◽  
M Odaka ◽  
Y Daisho ◽  
D Kawano ◽  
...  
Keyword(s):  
Thermal Efficiency ◽  
Fuel Injection ◽  
Three Dimensional ◽  
Expansion Ratio ◽  
Variable Valve Timing ◽  
Diesel Combustion ◽  
Valve Timing ◽  
Detailed Chemistry ◽  
Suppression Mechanism ◽  
Variable Valve

A variable valve timing (VVT) mechanism is applied to achieve premixed diesel combustion at higher load for low emissions and high thermal efficiency in a light-duty diesel engine. By means of late intake valve closing (LIVC), compressed gas temperatures near the top dead centre are lowered, thereby preventing too early ignition and increasing ignition delay to enhance fuel-air mixing. The variability of an effective compression ratio has significant potential for ignition timing control of conventional diesel fuel mixtures. At the same time, the expansion ratio is kept constant to ensure thermal efficiency. Combining the control of LIVC, exhaust gas recirculation (EGR), supercharging systems, and high-pressure fuel injection equipment can simultaneously reduce NO x and smoke. The NO x and smoke suppression mechanism in the premixed diesel combustion is analysed using a three-dimensional computational fluid dynamics (3D-CFD) code combined with detailed chemistry. LIVC can achieve a significant NO x and smoke reduction due to lowering combustion temperatures and avoiding local overrich regions in the mixtures respectively.

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