Numerical and experimental investigation on combustion characteristics of a spark ignition engine with an early intake valve closing load control

Millo, Federico; Luisi, Sabino; Borean, Fabio; Stroppiana, Andrea

doi:10.1016/j.fuel.2013.12.047

Cited by 52 publications

(28 citation statements)

References 22 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The large-scale tumbling motion is generally created during the intake stroke by restricting the flow rate on the outer side of the inlet valve using straight ports oriented in such a way that most of the annular jet exiting the valve is directed towards the exhaust side Buhl et al (2017), Payri et al (2004), Falfari et al (2014). In addition, the tumble motion is enhanced greatly by using valve masking techniques but to the detriment of the engine breathing demand at high speeds or high loads Millo et al (2014). Shrouded valves are, nevertheless, unattractive solutions for production engines due to the weight increase and the fact that rotation must be prevented.…”

Section: Introductionmentioning

confidence: 99%

Experimental Investigation of the In-Cylinder Tumble Motion inside GDI Cylinder at Different Planes under Steady-State Condition using Stereoscopic-PIV

El-Adawy

Heikal

Aziz

2019

JAFM

View full text Add to dashboard Cite

This paper describes an experimental study aimed at the characterization of the steady-state tumble motion in the cylinder of an engine using stereoscopic particle image velocimetry (Stereo-PIV). More specifically, a pentroof four valves gasoline direct injection (GDI) engine head was mounted on a modified FEV steady-state flow rig for applying Stereo-PIV at different measurement vertical tumble planes at mid cylinder, mid injector and mid valve. The flow field was described by the distribution of the ensemble average flow patterns for 1000 pairs of images for every case, vorticity contours, turbulent kinetic energy and tumble ratio. The results revealed that the higher velocities acquired at the mid valve plane improved the turbulent kinetic energy and tumble ratio compared to the other planes. There was a good level of agreement between direct and indirect methods used for calculating the tumble ratio.

show abstract

Section: Introductionmentioning

confidence: 99%

Experimental Investigation of the In-Cylinder Tumble Motion inside GDI Cylinder at Different Planes under Steady-State Condition using Stereoscopic-PIV

El-Adawy

Heikal

Aziz

2019

JAFM

View full text Add to dashboard Cite

show abstract

“…In addition to CDA, EIVC and late intake valve closing (LIVC) are also effective methods to reduce PMEP [11][12][13]. By combining CDA with EIVC or LIVC, PMEP can be minimized further.…”

Section: Introductionmentioning

confidence: 99%

Study on Valve Strategy of Variable Cylinder Deactivation Based on Electromagnetic Intake Valve Train

Chang

et al. 2018

Applied Sciences

View full text Add to dashboard Cite

The camless electromagnetic valve train (EMVT), as a fully flexible variable valve train, has enormous potential for improving engine performances. In this paper, a new valve strategy based on the electromagnetic intake valve train (EMIV) is proposed to achieve variable cylinder deactivation (VCD) on a four-cylinder gasoline engine. The 1D engine model was constructed in GT-Power according to test data. In order to analyze the VCD operation with the proposed valve strategy, the 1D model was validated using a 3D code. The effects of the proposed valve strategy were investigated from the perspective of energy loss of the transition period, the mass fraction of oxygen in the exhaust pipe, and the minimum in-cylinder pressure of the active cycle. On the premise of avoiding high exhaust oxygen and oil suction, the intake valve timing can be determined with the variation features of energy losses. It was found that at 1200 and 1600 rpm, fuel economy was improved by 12.5–16.6% and 9.7–14.6%, respectively, under VCD in conjunction with the early intake valve closing (EIVC) strategy when the brake mean effective pressure (BMEP) ranged from 0.3 MPa to 0.2 MPa.

show abstract

“…Due to the restriction of the air flow into the cylinders by the throttle, the pumping mean effective pressure (PMEP) is large at part load conditions for throttled internal combustion engines. The possible solution to this problem is to adopt early or late intake valve closing (EIVC or LIVC) strategy [1][2][3]. Additionally, the most widely used way to improve the part load efficiency is the utilization of downsizing in combination with turbocharging.…”

Section: Introductionmentioning

confidence: 99%

Study on Valve Strategy and Fuel Benefits of Skip Fire Based on Electromagnetic Valve Train

Chang

2018

MATEC Web Conf.

View full text Add to dashboard Cite

Cylinder deactivation (CDA) is a fuel consumption reduction technology for gasoline engines. Skip fire is a new type of CDA because the load and the density of firing cylinder are in proportion to the torque demand. However, it is difficult to realize because valves need to be switched between valve deactivation and normal operation stroke by stroke. The Electromagnetic valve train (EMVT) provides a fully flexible control method to achieve skip fire. In the paper, a new skip fire strategy based on electromagnetic intake valve train (EMIV) is proposed. Then, the oxygen concentration of the exhaust pipe, energy losses, in-cylinder pressure of the skipped cycle and exhaust gas recirculation (EGR) rate of the firing cycle are studied by the 1D simulation in GT-Power. The results shows the majority of gas sucked into the skipped cylinder is exhaust gas by reasonable control of IVO and IVC, and the exhaust oxygen-rich can be avoided. Meanwhile, EGR rate of the firing cylinder and energy losses of the skipped cylinder are maintained at lower level. At the conditions of 1200 and 1600 rpm, fuel economy has been improved respectively 8.1%-16.6% and 6.4%-14.6% when the brake mean effective pressure (BMEP) ranges from 0.4MPa to 0.2MPa.

show abstract

Numerical and experimental investigation on combustion characteristics of a spark ignition engine with an early intake valve closing load control

Cited by 52 publications

References 22 publications

Experimental Investigation of the In-Cylinder Tumble Motion inside GDI Cylinder at Different Planes under Steady-State Condition using Stereoscopic-PIV

Experimental Investigation of the In-Cylinder Tumble Motion inside GDI Cylinder at Different Planes under Steady-State Condition using Stereoscopic-PIV

Study on Valve Strategy of Variable Cylinder Deactivation Based on Electromagnetic Intake Valve Train

Study on Valve Strategy and Fuel Benefits of Skip Fire Based on Electromagnetic Valve Train

Contact Info

Product

Resources

About