scholarly journals Effects of Intake Valve Lift Form Modulation on Exhaust Temperature and Fuel Economy of a Low-loaded Automotive Diesel Engine

2021 ◽  
pp. 85-99
Author(s):  
Hasan Üstün BAŞARAN
Keyword(s):  
Diesel Engine ◽  
Fuel Economy ◽  
Valve Lift ◽  
Intake Valve ◽  
Exhaust Temperature

Study on Optimization of the Diesel Engine Controlling Parameters Based on Genetic Algorithm

2012 ◽  
Vol 253-255 ◽  
pp. 2125-2129
Author(s):  
Qing Guo Luo ◽  
Hong Bin Liu ◽  
Qiang Ma
Keyword(s):  
Genetic Algorithm ◽  
Diesel Engine ◽  
Economic Efficiency ◽  
Test Sample ◽  
Opening Angle ◽  
Maximum Pressure ◽  
Intake Valve ◽  
Engine Simulation ◽  
Exhaust Temperature ◽  
Virtual Test

The diesel engine simulation model build by the GT-POWER software was tested and verified. The advance angle of injection, the opening angle of intake valve and the opening angle of exhaust valve was calculated to get the virtual test sample of diesel engine running under the rated condition. The optimization model was built based on the genetic algorithm, and three parameters were optimized aimed at the economic efficiency under the constraint of the maximum pressure in cylinder and the exhaust temperature; the error between the optimization and the simulation result was below 3%.

The effect of intake valve lift load control on gasoline engine fuel economy

2011 ◽  
Author(s):  
Shun-tang Hu ◽  
Dao-wei Zhu ◽  
Hui Xie ◽  
Tao Chen ◽  
Hua Zhao
Keyword(s):  
Fuel Economy ◽  
Gasoline Engine ◽  
Valve Lift ◽  
Load Control ◽  
Engine Fuel ◽  
Intake Valve

Study of Flow Characteristics of Air in DI Diesel Engine by Modification in Intake Valve

2017 ◽  
Author(s):  
Akshay Pofalkar ◽  
N. V. Borse ◽  
D. B. Hulwan
Keyword(s):  
Diesel Engine ◽  
Flow Characteristics ◽  
Intake Valve ◽  
Di Diesel Engine

Fuel economy, NOx emissions and lean NOx trap efficiency: Lessons from current driving cycles

2021 ◽  
pp. 146808742110050
Author(s):  
José Rodríguez-Fernández ◽  
Juan José Hernández ◽  
Ángel Ramos ◽  
Alejandro Calle-Asensio
Keyword(s):  
Fuel Economy ◽  
Thermal Efficiency ◽  
Transport Sector ◽  
Lean Nox Trap ◽  
Ambient Temperatures ◽  
Exhaust Temperature ◽  
Driving Cycles ◽  
Vehicle Velocity ◽  
Two Factors ◽  
Lean Nox

Transport sector is within a profound changing period, but diesel engines are still called to play a significant role in future supported on their solid share in many regions and superior thermal efficiency compared to spark-ignited engines. This work identifies the parameters that most affect fuel consumption and NOx emissions on a diesel passenger car equipped with a lean NOx trap under different driving cycles and ambient temperatures. High average vehicle velocity was beneficial to reduce the fuel consumed per kilometer. The driving dynamics was of little importance, easily counteracted by a higher thermal efficiency, higher engine temperature (because of a longer trip) or/and an efficient gear shifting strategy. Moreover, at low ambient temperature the latter two factors doubled their weight on fuel economy. Regarding tailpipe NOx, keeping high aftertreatment performance was crucial. For this, low engine-out NOx emissions were four times more important than exhaust temperature or flow rate.

The Effect of Intake Valve Lift on Turbulence Intensity and Burnrate in S.I. Engines-Model Versus Experiment

1984 ◽  
Author(s):  
G.C. Davis ◽  
R.J. Tabaczynski ◽  
R.C. Belaire
Keyword(s):  
Turbulence Intensity ◽  
Valve Lift ◽  
Intake Valve ◽  
Model Versus

Development of a Higher Boost Turbocharged Diesel Engine for Better Fuel Economy in Heavy Vehicles

1983 ◽  
Author(s):  
Takashi Suzuki ◽  
Akihiko Sato ◽  
Koichi Suenaga
Keyword(s):  
Diesel Engine ◽  
Fuel Economy ◽  
Heavy Vehicles ◽  
Turbocharged Diesel Engine

scholarly journals Increasing Exhaust Temperature of an Idling Light-Duty Diesel Engine through Post-Injection and Intake Throttling

2018 ◽  
Author(s):  
Tayyar Ozel ◽  
Matthew J. Hall ◽  
Ron Matthews
Keyword(s):  
Diesel Engine ◽  
Post Injection ◽  
Exhaust Temperature ◽  
Light Duty

Two-Stroke Cycle Diesel Engine Fuel Economy Improvement and Emission Reduction

1977 ◽  
Author(s):  
J. F. Pearce ◽  
R. J. Hames ◽  
D. F. Merrion
Keyword(s):  
Diesel Engine ◽  
Fuel Economy ◽  
Emission Reduction ◽  
Engine Fuel ◽  
Fuel Economy Improvement ◽  
Stroke Cycle

A Small Displacement DI Diesel Engine Concept for High Fuel Economy Vehicles

1997 ◽  
Author(s):  
David L. Boggs ◽  
Richard C. Belaire ◽  
Bernd Bartunek ◽  
Manfred Dürnholz ◽  
Hermann-Josef Ecker
Keyword(s):  
Diesel Engine ◽  
Fuel Economy ◽  
Small Displacement ◽  
Di Diesel Engine ◽  
Engine Concept

Experimental research on pumping losses and combustion performance in an unthrottled spark ignition engine

2018 ◽  
Vol 232 (7) ◽  
pp. 888-897 ◽  
Author(s):  
Tingting Sun ◽  
Yingjie Chang ◽  
Zongfa Xie ◽  
Kaiyu Zhang ◽  
Fei Chen ◽  
...  
Keyword(s):  
Spark Ignition ◽  
Spark Ignition Engine ◽  
Valve Lift ◽  
Combustion Characteristic ◽  
Spark Ignition Engines ◽  
Intake Valve ◽  
Valve System ◽  
Combustion Performance ◽  
Intake Swirl ◽  
Variable Valve

A novel fully hydraulic variable valve system is described in this paper, which achieves continuous variations in maximum valve lift, valve opening duration, and the timing of valve closing. The load of the unthrottled spark ignition engine with fully hydraulic variable valve system is controlled by using an early intake valve closing rather than the conventional throttle valve. The experiments were carried out on BJ486EQ spark ignition engine with fully hydraulic variable valve system. Pumping losses of the throttled and unthrottled spark ignition engines at low-to-medium loads are compared and the reason of it decreasing significantly in the unthrottled spark igntion engine is analyzed. The combustion characteristic parameters, such as cyclic variation, CA50, and heat release rate, were analyzed. The primary reasons for the lower combustion rate in the unthrottled spark ignition engines are discussed. In order to improve the evaporation of fuel and mix with air in an unthrottled spark ignition engine, the in-cylinder swirl is organized with a helical intake valve, which can generate a strong intake swirl at low intake valve lifts. The effects of the intake swirl on combustion performance are investigated. Compared with the throttled spark ignition engine, the brake specific fuel consumption of the improved unthrottled spark ignition engine is reduced by 4.1% to 11.2%.

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