The Influence of Compression Ratio on Indicated Emissions and Fuel Economy Responses to Input Variables for a D.I Diesel Engine Combustion System

2012 ◽  
Author(s):  
David J. MacMillan ◽  
Theo Law ◽  
Paul J. Shayler ◽  
Ian Pegg
Keyword(s):  
Diesel Engine ◽  
Compression Ratio ◽  
Fuel Economy ◽  
Combustion System ◽  
Engine Combustion ◽  
Input Variables

Engine Calibration Using “Eigenvariables”

2017 ◽  
Author(s):  
Yiran Hu ◽  
Ibrahim Haskara ◽  
Chen-Fang Chang ◽  
Kaveh Khodadadi Sadabadi ◽  
Ayyoub Rezaeian ◽  
...  
Keyword(s):  
Fuel Economy ◽  
Development Process ◽  
Operating Conditions ◽  
Vehicle Design ◽  
Combustion System ◽  
Design Constraints ◽  
Engine Calibration ◽  
Engine Control System ◽  
Engine Combustion ◽  
Vehicle Development Process

To meet the more stringent emissions and fuel economy regulations, engine control system has become significantly more complex than before. As a result of this, engine calibration on the dynamometer now occupies one of the longest time sections in the vehicle development process. One strategy automakers have adopted is to use the same engine in multiple applications to reduce the calibration effort. Even then, vehicle design constraints often require changes to be made to the engine’s external components such as the intake and exhaust manifolds. These changes can create variations in the engine combustion behavior so that the engine must be recalibrated on the dyno, resulting in additional cost and effort. This paper explores the potential of reusing existing engine dyno data for a modified engine in these scenarios through the use of the so-called eigenvariable to describe engine operating conditions. Traditionally, engine dyno data is referenced by engine load and speed along with actuator positions (such as camphaser positions). The proposed approach describes dyno data using eigenvariables or variables that describe the engine in-cylinder condition prior to combustion. Eigenvariables are invariant with respect to external engine hardware. This invariance enables the same dyno data to be applied to a modified engine with the same combustion system design.

Ford 2011 6.7L Power Stroke® Diesel Engine Combustion System Development

2011 ◽  
Author(s):  
Joshua Styron ◽  
Brian Baldwin ◽  
Brien Fulton ◽  
David Ives ◽  
Subramanian Ramanathan
Keyword(s):  
Diesel Engine ◽  
System Development ◽  
Power Stroke ◽  
Combustion System ◽  
Engine Combustion

The Diesel Engine for Cars—Is There a Future?

1998 ◽  
Vol 120 (3) ◽  
pp. 641-647 ◽  
Author(s):  
F. F. Pischinger
Keyword(s):  
Diesel Engine ◽  
Fuel Economy ◽  
Fuel Efficiency ◽  
Exhaust Emissions ◽  
Low Noise ◽  
The State ◽  
Specific Power ◽  
Combustion System ◽  
Passenger Car ◽  
The Future

The diesel engine is known as the most fuel efficient combustion engine. Its acceptance for use in passengers cars, however, varies geographically. Today, the diesel car plays an important role in Europe; in France, for instance, it is achieving a remarkable market share of about 42 percent, while in the US its market penetration can be neglected. Many questions are expressed concerning the future of diesel powered cars. The question affecting market acceptance is as follows: can the significantly better fuel efficiency of a diesel car outweigh perceived detrimental characteristics? Such unfavorable properties are thought to be low specific power, objectionable noise, higher exhaust emissions (including smoke), and higher vehicle price. These features are closely influenced by the state of passenger car diesel engine technology. This technology state and its potential must be evaluated with respect to current and future demands, for instance, tighter exhaust emission regulations. In addition, the commercial value and consumer acceptance of high fuel economy must be evaluated. It is clear that the ultimate result of weighing the pros and cons will depend not only on technological factors, but also on political factors such as fuel taxation. Regarding the state of technology, the diesel car is very promising. First, by employing a direct injection combustion system, the fuel efficiency can be improved by about 15 percent over current swirl chamber engines. Furthermore, the specific power (hp/ltr) can be increased by efficient supercharging to achieve values of today’s gasoline engines. By tuning the combustion system, low noise engine design features and incorporation of careful noise reduction measures on the vehicle, the noise behavior of a spark ignited vehicle can be reached. Exhaust emissions can currently be reduced to a level to satisfy today’s European and US Tier 1 emission limits. However, significant development effort remains. More stringent emission levels (California US, Tier 2 ULEV, and Stage 3 in Europe) require further advancements in diesel combustion. The strong development potential of 4-value engines and new unique injection systems is evident. In addition, there are promising developments with lean NOx catalysts and regenerative particulate filters. These technologies offer the potential to meet the very stringent future emission standards. It is anticipated that the sophisticated technology needed to meet these standards will make the future diesel car more expensive compared to a gasoline fueled vehicle. This raises the issue of what price will the consumer pay for the higher fuel economy of a diesel car. In light of the worldwide rapid increase in passenger car population and of the dwindling oil reserves and their global distribution, the fuel efficient diesel engine will play an important role in the future of passenger cars.

Investigating the Effects of Turbulence Inducement on Diesel Engine Combustion and Emission Characteristics

2003 ◽  
Author(s):  
K. R. Senthilkumar ◽  
K. V. Gopalakrishnan ◽  
Pramod S. Mehta
Keyword(s):  
Diesel Engine ◽  
Fuel Economy ◽  
Direct Injection ◽  
Working Fluid ◽  
Emission Characteristics ◽  
Bluff Bodies ◽  
Thin Wire ◽  
Brake Thermal Efficiency ◽  
Piston Crown ◽  
Engine Combustion

In the present work, the effects of inducing in-cylinder turbulence through bluff bodies or internal jets are experimentally investigated on a direct injection diesel engine. The bluff bodies are placed horizontally across the piston cavity in the form of rods or rods wound with thin wire in different arrangements. The jet turbulence is introduced by holes on the piston crown, allowing a tangential entry of the working fluid into the piston cavity along the direction of swirl. The changes in performance, emission and combustion characteristics of the engine, due to these arrangements, are analyzed. In general, horizontal bluff bodies do not result in significant advantage in fuel economy and smoke levels, but some reduction in NOx concentration is observed. More importantly, it is observed that the internal jets introduced through the tangential holes showed improvement in the engine brake thermal efficiency and exhaust smoke level with a marginal increase in NOx concentration.

Research on Parameters Optimization of Biodiesel Engine Combustion System

2013 ◽  
Vol 385-386 ◽  
pp. 77-80
Author(s):  
Yin Sheng Xu ◽  
Hua Zhu ◽  
Ke Jiu Lu
Keyword(s):  
Diesel Engine ◽  
Diesel Engines ◽  
Thermal Efficiency ◽  
Test Bench ◽  
Combustion Efficiency ◽  
Parameters Optimization ◽  
Combustion System ◽  
Economical Efficiency ◽  
System Parameters ◽  
Engine Combustion

This paper researches on the optimization of the effective thermal efficiency of diesel engines for the target optimization on the test bench to investigate the economical efficiency impact of combustion system parameters of diesel engine fueled with biodiesel to determine the optimum value of these parameters in order to improve the burning biodiesel combustion efficiency of the diesel engine. Results show that the system parameters through the optimization of combustion can meet the standard of the diesel calibration power levels up to the original machine, combustion efficiency can be achieved for more than 32%.

Sign in / Sign up

Export Citation Format

Share Document