Study of Unconventional Cycles (Atkinson and Miller) with Mixture Heating as a Means for the Fuel Economy Improvement of a Throttled SI Engine at Part Load

2012 ◽  
Vol 5 (4) ◽  
pp. 1624-1636 ◽  
Author(s):  
Lubomir Miklanek ◽  
Oldrich Vitek ◽  
Ondrej Gotfryd ◽  
Vojtech Klir
Keyword(s):  
Fuel Economy ◽  
Si Engine ◽  
Part Load ◽  
Fuel Economy Improvement

Parametric Study of Cylinder Deactivation and Valve Deactivation for Unthrottled Operation

2012 ◽  
Vol 614-615 ◽  
pp. 525-528
Author(s):  
Ahmad Solehin Paimon ◽  
Wira Jazair ◽  
Srithar Rajoo
Keyword(s):  
Internal Combustion Engine ◽  
Fuel Consumption ◽  
Fuel Economy ◽  
Parametric Study ◽  
Combustion Engine ◽  
Transient Operation ◽  
Si Engine ◽  
Cylinder Deactivation ◽  
Part Load ◽  
Induction Strategy

Cylinder deactivation (CDA) as well as valve deactivation (VDA) technologies provides big potentials to decrease fuel consumption and emission at part load operation for SI engine. In real driving situation, an internal combustion engine operates in transient operation where the load and speed varies continuously. This part load operation leads the engine to have poor fuel consumption and emission due to throttle pumping losses. This paper will investigate the further potential of both induction strategy, cylinder deactivation and valve deactivation in extending the fuel economy at part load.

Experimental and Simulation Analysis of PFI-SI Engine for Fuel Economy Improvement

2005 ◽  
Author(s):  
Srinivasan Venugopalan ◽  
Ming-Chia Lai ◽  
Feng Wu ◽  
Frank M. Washko
Keyword(s):  
Fuel Economy ◽  
Simulation Analysis ◽  
Si Engine ◽  
Fuel Economy Improvement

scholarly journals Study of the Miller Cycle on a Turbocharged DI Gasoline Engine Regarding Fuel Economy Improvement at Part Load

Energies ◽  
2020 ◽  
Vol 13 (6) ◽  
pp. 1500 ◽  
Author(s):  
Xuewei Pan ◽  
Yinghua Zhao ◽  
Diming Lou ◽  
Liang Fang
Keyword(s):  
Fuel Economy ◽  
Thermal Efficiency ◽  
Gasoline Engine ◽  
Bench Test ◽  
Miller Cycle ◽  
Valve Timing ◽  
Brake Thermal Efficiency ◽  
Part Load ◽  
Brake Mean Effective Pressure ◽  
Fuel Economy Improvement

This contribution is focused on the fuel economy improvement of the Miller cycle under part-load characteristics on a supercharged DI (Direct Injection) gasoline engine. Firstly, based on the engine bench test, the effects with the Miller cycle application under 3000 rpm were studied. The results show that the Miller cycle has different extents of improvement on pumping loss, combustion and friction loss. For low, medium and high loads, the brake thermal efficiency of the baseline engine is increased by 2.8%, 2.5% and 2.6%, respectively. Besides, the baseline variable valve timing (VVT) is optimized by the test. Subsequently, the 1D CFD (Computational Fluid Dynamics) model of the Miller cycle engine after the test optimization at the working condition of 3000 rpm and BMEP (Brake Mean Effective Pressure) = 10 bar was established, and the influence of the combined change of intake and exhaust valve timing on Miller cycle was studied by simulation. The results show that as the effect of the Miller cycle deepens, the engine’s knocking tendency decreases, so the ignition timing can be further advanced, and the economy of the engine can be improved. Compared with the brake thermal efficiency of the baseline engine, the final result after simulation optimization is increased from 34.6% to 35.6%, which is an improvement of 2.9%.

Investigations on Supercharging Stratified Part Load in a Spray-Guided DI SI Engine

2008 ◽  
Vol 1 (1) ◽  
pp. 171-176 ◽  
Author(s):  
A. Kneifel ◽  
S. Buri ◽  
A. Velji ◽  
U. Spicher ◽  
J. Pape ◽  
...  
Keyword(s):  
Si Engine ◽  
Part Load

Tumble Flow Measurements Using Three Different Methods and Its Effects on Fuel Economy and Emissions

2006 ◽  
Author(s):  
Myoungjin Kim ◽  
Sihun Lee ◽  
Wootae Kim
Keyword(s):  
Fuel Economy ◽  
High Performance ◽  
Gasoline Engine ◽  
Exhaust Emissions ◽  
Combustion Stability ◽  
Lean Burn ◽  
Flow Measurements ◽  
Part Load ◽  
Gasoline Engines ◽  
Dynamometer Test

In-cylinder flows such as tumble and swirl have an important role on the engine combustion efficiencies and emission formations. In particular, the tumble flow, which is dominant in-cylinder flow in current high performance gasoline engines, has an important effect on the fuel consumptions and exhaust emissions under part load conditions. Therefore, it is important to know the effect of the tumble ratio on the part load performance and optimize the tumble ratio of a gasoline engine for better fuel economy and exhaust emissions. First step in optimizing a tumble flow is to measure a tumble ratio accurately. In this research the tumble flow was measured, compared and correlated using three different measurement methods: steady flow rig, 2-Dimensional PIV, and 3-Dimensional PTV. Engine dynamometer test was performed to find out the effect of the tumble ratio on the part load performance. Dynamometer test results of high tumble ratio engine showed faster combustion speed, retarded MBT timing, higher exhaust emissions, and a better lean burn combustion stability. Lean limit of the baseline engine was expanded from A/F=18:1 to A/F=21:1 by increasing a tumble ratio using MTV.

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