Analysis of Variable Valve Timing Events and Their Effects on Single Cylinder Diesel Engine

Parvate-Patil, G. B.; Hong, Henry; Gordon, Brandon W.

doi:10.4271/2004-01-2965

Cited by 22 publications

(12 citation statements)

References 8 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The intake and exhaust systems are different from conventional reciprocating engines, whose exhaust and intake valve timing has overlaps in order to increase the charging efficiency and brake thermal efficiency (Parvate-Patil et al, 2004). The ORP engine is composed of four cylinders, two engine blocks, two shafts and two spark plugs, as shown in Figure 1.…”

Section: Structures and Operation Process Of Opposed Rotary Piston Enmentioning

confidence: 99%

Intake characteristics and pumping loss in the intake stroke of a novel small scale opposed rotary piston engine

Gao

Tian

Jenner

et al. 2020

Journal of Cleaner Production

View full text Add to dashboard Cite

Section: Structures and Operation Process Of Opposed Rotary Piston Enmentioning

confidence: 99%

Intake characteristics and pumping loss in the intake stroke of a novel small scale opposed rotary piston engine

Gao

Tian

Jenner

et al. 2020

Journal of Cleaner Production

View full text Add to dashboard Cite

“…The flow through the intake and exhaust manifold will significantly affect the fuel efficiency, power output and exhaust emissions of diesel engines. Parvate-Patil et al analyzed VVT (Variable Valve Timing) and their effects on diesel engines and compared the role of VVT in gasoline and diesel engines [1]. Murata et al achieved premixed combustion with VVT and concluded that late inlet valve closing could achieve a significant NOx and smoke reduction [2].…”

Section: Introductionmentioning

confidence: 98%

13 Mode Fuel Benefit Investigation Using Variable Valve Timing in a Heavy Duty Diesel Engine

Deng

Stobart

2009

2009 Asia-Pacific Power and Energy Engineering Conference

View full text Add to dashboard Cite

Variable valve actuation in heavy duty diesel engines is not well documented, partly because of diesel engine nature, such as, unthrottled air handling, which gives little room to improve pumping loss; a very high compression ratio, which makes the clearance between the piston and valve is little when the piston reaches the top dead center. It is a long time that diesel engines are running by EGR and VGT. The goal of this research work is addressed the issue about how much fuel benefit diesel engines at 13-mode cycle could be achieved using variable valve timing in a heavy duty diesel engine. Late inlet valve closing strategy will be used. In order to see how much fuel efficiency could improve in addition to EGR and VGT, EGR and VGT are fully controlled in a closed-loop. This paper examines fuel improvement in different speeds and torques. Finally, we could see that 3.28% BSFC benefit at 13-mode cycle could be achieved. The reason of this benefit is that fixed valve lift engine makes a compromise between high speed engine performance and low speed fuel economy, late inlet valve closing optimizes valve timing at each engine torque and speed.

show abstract

“…The reduction of energy extracted as work on the piston results in more energy remaining in the form of heat which is expelled through the exhaust. 28 Previous studies have concluded that there is a potential for EEVO to raise exhaust temperatures. [29][30][31][32] Wickstro¨m 31 noted an exhaust temperature increase with EEVO; however, this was not studied in detail due to the large fuel consumption penalty induced.…”

Section: Introductionmentioning

confidence: 99%

Modeling the impact of early exhaust valve opening on exhaust aftertreatment thermal management and efficiency for compression ignition engines

Roberts

Magee

Shaver

et al. 2014

International Journal of Engine Research

View full text Add to dashboard Cite

In response to strict emissions regulations, engine manufacturers have implemented aftertreatment technologies to reduce the tailpipe emissions from diesel engines. The effectiveness of most of these systems is limited when exhaust temperatures are below 250°C. This is problematic during cold start and at low-load engine operation when the exhaust gas temperature is too low to keep the aftertreatment working effectively. The implementation of variable valve actuation strategies, including early exhaust valve opening, has been proposed as a means to elevate exhaust temperatures. Early exhaust valve opening results in hotter exhaust gas; however, more fueling is needed to maintain brake power output. This article outlines an analysis of the impact of early exhaust valve opening on exhaust temperature (measured at the turbine outlet) and the required fueling. An experimentally validated model is developed, which relates fueling increase with the timing of exhaust valve opening. This model is used to generate expressions for brake thermal efficiency and turbine out temperature as a function of exhaust valve opening. These expressions are used to evaluate the impact of early exhaust valve opening over the entire low-load operating space of a diesel engine. The model predicts an approximate 30°C-100°C increase in turbine out temperature at a given commanded exhaust valve opening of 90°b efore nominal, which is sufficient to raise many low-load operating conditions to exhaust temperatures above 250°C; however, the analysis also predicts penalties in brake thermal efficiency as large as 0.05 points.

show abstract

Analysis of Variable Valve Timing Events and Their Effects on Single Cylinder Diesel Engine

Cited by 22 publications

References 8 publications

Intake characteristics and pumping loss in the intake stroke of a novel small scale opposed rotary piston engine

Intake characteristics and pumping loss in the intake stroke of a novel small scale opposed rotary piston engine

13 Mode Fuel Benefit Investigation Using Variable Valve Timing in a Heavy Duty Diesel Engine

Modeling the impact of early exhaust valve opening on exhaust aftertreatment thermal management and efficiency for compression ignition engines

Contact Info

Product

Resources

About