Cylinder Deactivation with Mechanically Fully Variable Valve Train

Flierl, Rudolf; Lauer, Frederic; Breuer, M.; Hannibal, Wilhelm

doi:10.4271/2012-01-0160

Cited by 37 publications

(22 citation statements)

References 3 publications

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“…These findings are in agreement with [5] who showed 8-16% BSFC improvement in similar operating conditions. However, [11] shows BSFC improvements of over 20% for engine speeds between 1000rpm-4000rpm at loads below 1bar BMEP with an engine equipped with an electro-mechanical valvetrain and valve deactivation system.…”

Section: Discussionsupporting

confidence: 83%

“…However, it is more useful to analyse the BSFC in terms of percentage improvements as shown in Table 5. The method of BSFC benefits contour mapping against engine speed and BMEP has been successfully demonstrated by [5] and [11].…”

Section: Discussionmentioning

confidence: 99%

“…Simulations were carried out on both the base engine model and the CDA+VVA model with smaller throttle angle increments for the engine speed range between 1000rpm and 4000rpm. Similar engine speed ranges for CDA applications have been investigated by [5] and [10].…”

Section: Analysis Of Datamentioning

confidence: 99%

“…In order to simulate cylinder deactivation in the model, cylinders 2 and 3 which are alternative cylinders in the firing order were chosen to be deactivated. Similar CDA methods based on deactivating even number of cylinders in the firing order have been discussed by [5] and [8]. CDA was achieved by using the valve deactivation and to minimise Brake Specific Fuel Consumption (BSFC) output which were the two of main targets considered in this study.…”

Section: Cda+vva Model Simulation Setupmentioning

confidence: 99%

“…By deactivating selected cylinders, the remaining working cylinders have to operate at a higher Indicated Mean Effective Pressure (IMEP) to maintain the same load, therefore the throttle valve is kept at a more open position than the case where all cylinders are activated, to allow more air into the working cylinders. Increased efficiency at part load operation with CDA has led to improved fuel consumption and reduced emissions [5].…”

Section: Introductionmentioning

confidence: 99%

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Investigation of Cylinder Deactivation and Variable Valve Actuation on Gasoline Engine Performance

Kuruppu

Pesiridis

Rajoo

2014

SAE Technical Paper Series

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Increasingly stringent regulations on gasoline engine fuel consumption and exhaust emissions require additional technology integration such as Cylinder Deactivation (CDA) and Variable valve actuation (VVA) to improve part load engine efficiency. At part load, CDA is achieved by closing the inlet and exhaust valves and shutting off the fuel supply to a selected number of cylinders. Variable valve actuation (VVA) enables the cylinder gas exchange process to be optimised for different engine speeds by changing valve opening and closing times as well as maximum valve lift. The focus of this study was the investigation of effect of the integration of the above two technologies on the performance of a gasoline engine operating at part load conditions.In this study, a 1.6 Litre in-line 4-cylinder gasoline engine is modelled on an engine simulation software and its data were analysed to show improvements in fuel consumption, CO2 emissions, pumping losses and effects on CO and NOx emissions. A CDA and VVA operating window is identified which yields brake specific fuel consumption improvements of 10-20% against the base engine for speeds between 1000rpm to 3500rpm at approximately 12.5% load. Highest concentration of CO emissions was observed for BMEP inbetween 4 bar to 5 bar at 4000rpm, and highest concentration of NOx found at the same load range but at 1000rpm. Findings based on simulation results point towards significant part load performance improvements which can be achieved by integrating cylinder deactivation and variable valve actuation on gasoline engines.

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Section: Discussionsupporting

confidence: 83%

Section: Discussionmentioning

confidence: 99%

Section: Analysis Of Datamentioning

confidence: 99%

Section: Cda+vva Model Simulation Setupmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Investigation of Cylinder Deactivation and Variable Valve Actuation on Gasoline Engine Performance

Kuruppu

Pesiridis

Rajoo

2014

SAE Technical Paper Series

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Trends—Compression Ignition

Samaras

Vouitsis

Geivanidis

2014

Encyclopedia of Automotive Engineering

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The CI engine has changed significantly over the last quarter of the century, in terms of technology and performance giving at the same time to customer more fuel economy and more driving pleasure. From a societal viewpoint, it has provided significant fuel saving and CO 2 emission reduction and it has complied with ever more stringent emission regulations. This evolution has been supported by a sustained technological improvement. This chapter discusses the advanced engine technologies that became essential. They include fuel injection with rate shaping capability and elevated injection pressures, variable geometry engine characteristics along with optimized turbocharging and downsizing, flexible engine systems, thermal management, friction loss reduction, advanced combustion modes, and advanced exhaust aftertreatment systems for emission control.

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