scholarly journals A Study on a mechanical continuously variable injection timing system for improvement of agricultural small diesel DI engine

2014 ◽  
Vol 17 (4) ◽  
pp. 57-66
Author(s):  
Cong Huynh Thanh
Keyword(s):  
Engine Performance ◽  
Injection Pressure ◽  
Continuous Variable ◽  
Friction Torque ◽  
Maximum Deviation ◽  
Injection Timing ◽  
Emission Characteristics ◽  
Performance And Emission ◽  
Wide Range ◽  
Timing System

This paper presents the development of a MCVIT (mechanical continuous variable injection timing) system for evaluating effects of injection timing – one of the efficiently experimental methods for improving diesel engine performance and emission characteristics to match modern emission regulations and bio-fuels. A MCVIT system has been designed and built with the ability to adjust freely and directly the injection timing for a wide range from 0 to 40°CA BTDC (before top dead center) while keeping the same injection pressure rate. Some experiments have been done to verify its significant specifications such as friction torque – speed curve, accuracy and stability. The results show that the maximum friction torque of this system is around 2.6N.m over range of engine speed and its maximum deviation is ±1.0°CA over a large range of testing injection timing. Preliminary study on VIKYNO RV215-2 agricultural small diesel DI engine has also proved that the engine performance and emission characteristics are directly influenced by injection timing. Thus the developed MCVIT system is an efficient and low cost tool for R&D activities in small diesel engines.

scholarly journals Performance and Emission Characteristics of CI Engine with Modification in Fuel Injector

2020 ◽  
Vol 9 (3) ◽  
pp. 1604-1607
Keyword(s):  
Diesel Engine ◽  
Thermal Efficiency ◽  
Engine Performance ◽  
Injection Pressure ◽  
Emission Characteristics ◽  
Compression Ignition ◽  
Fuel Injector ◽  
Performance And Emission ◽  
Toxic Emission ◽  
Ci Engine

Work has been carried out using four stroke single cylinder diesel engine with retrofit attached with fuel injector and at optimum injection pressure 210 bar and 230 BTDC. The main purpose of using retrofit is to achieve HCCI (Homogeneous charge compression ignition) with which emissions can be reduced. Four Variants of retrofits were used and with V-cut type retrofit it was found that there is reduction in toxic emission like CO and NO but there was slight increase in HC emission when compared with normal fuel injector. Engine performance was compared with normal injector and injector with V-cut and it was found that Break thermal efficiency was increased by 0.25% at full load and 1.53% at 80% load and specific fuel consumption decreased by 0.01%.

Controlling Backfire Using Changes of the Valve Overlap Period for a Hydrogen-Fueled Engine Using an External Mixture

2007 ◽  
Author(s):  
T. C. Huynh ◽  
J. K. Kang ◽  
K. C. Noh ◽  
Jong T. Lee ◽  
J. A. Caton
Keyword(s):  
High Efficiency ◽  
Engine Performance ◽  
Continuous Variable ◽  
Operating Conditions ◽  
Variable Valve Timing ◽  
Valve Timing ◽  
Wide Range ◽  
Timing System ◽  
Variable Valve ◽  
Valve Overlap

The development of a hydrogen-fueled engine using an external mixture (e.g., using port or manifold fuel injection) with high efficiency and high power is dependent on the control of backfire. This work has developed a method to control backfire by reducing the valve overlap period while maintaining or improving engine performance. For this goal, a single-cylinder hydrogen-fueled research engine with a mechanical continuous variable valve timing system was developed. This facility provides a wide range of valve overlap periods that can be continuously and independently varied during firing operation. By using this research engine, the behavior of backfire occurrence and engine performance are determined as functions of the valve overlap period for fuel-air equivalence ratios between 0.3 and 1.2. The results showed that the developed hydrogen-fueled research engine with the mechanical continuous variable valve timing system has similar performance to a conventional engine with fixed valve timings, and is especially effective in controlling the valve overlap period. Backfire occurrence is reduced with a decrease of the valve overlap period, and is also significantly decreased even under operating conditions with the same volumetric efficiency. These results demonstrate that decreasing the valve overlap period may be one of the methods for controlling backfire in a hydrogen-fueled engine while maintaining or improving performance.

Controlling Backfire for a Hydrogen-Fueled Engine Using External Mixture Injection

2008 ◽  
Vol 130 (6) ◽  
Author(s):  
T. C. Huynh ◽  
J. K. Kang ◽  
K. C. Noh ◽  
Jong T. Lee ◽  
J. A. Caton
Keyword(s):  
High Efficiency ◽  
Engine Performance ◽  
Continuous Variable ◽  
Operating Conditions ◽  
Variable Valve Timing ◽  
Valve Timing ◽  
Wide Range ◽  
Timing System ◽  
Variable Valve ◽  
Valve Overlap

The development of a hydrogen-fueled engine using external mixture injection (e.g., using port or manifold fuel injection) with high efficiency and high power is dependent on the control of backfire. This work has developed a method to control backfire by reducing the valve overlap period while maintaining or improving engine performance. For this goal, a single-cylinder hydrogen-fueled research engine with a mechanical continuous variable valve timing system was developed. This facility provides a wide range of valve overlap periods that can be continuously and independently varied during firing operation. By using this research engine, the behavior of backfire occurrence and engine performance are determined as functions of the valve overlap period for fuel-air equivalence ratios between 0.3 and 1.2. The results showed that the developed hydrogen-fueled research engine with the mechanical continuous variable valve timing system has similar performance to a conventional engine with fixed valve timings, and is especially effective in controlling the valve overlap period. Backfire occurrence is reduced with a decrease in the valve overlap period, and is also significantly decreased even under operating conditions with the same volumetric efficiency. These results demonstrate that decreasing the valve overlap period may be one of the methods for controlling backfire in a hydrogen-fueled engine while maintaining or improving performance.

scholarly journals Experimental investigation on performance and emission characteristics of diesel - Jatropha methyl ester blends fueled diesel engine at optimum engine operating parameters

2010 ◽  
Vol 7 (2) ◽  
pp. 399-406 ◽  
Author(s):  
M. Venkatraman ◽  
G. Devaradjane
Keyword(s):  
Diesel Engine ◽  
Methyl Ester ◽  
Compression Ratio ◽  
Direct Injection ◽  
Engine Performance ◽  
Injection Pressure ◽  
Injection Timing ◽  
Performance And Emission ◽  
Performance And Emissions ◽  
Blended Fuel

In the present investigation, tests were carried out to determine engine performance, combustion and emissions of a naturally aspirated direct injection diesel engine fueled with diesel and Jatropha Methyl ester and their blends (JME10, JME20 and JME30). Comparison of performance and emission was done for different values of compression ratio, injection pressure and injection timing to find best possible combination for operating engine with JME. It is found that the combined compression ratio of 19:1, injection pressure of 240 bar and injection timing of 27?bTDC increases the BTHE and reduces BSFC while having lower emissions.From the investigation, it is concluded that the both performance and emissions can considerably improved for Methyl ester of jatropha oil blended fuel JME20 compared to diesel.

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