Meta - CVD System An Electro-Mechanical Cylinder and Valve Deactivation System

Kreuter, Peter; Heuser, Peter; Reinicke-Murmann, Joachim; Erz, Rüdiger; Stein, Peter; Peter, Ulrich

doi:10.4271/2001-01-0240

Cited by 21 publications

(9 citation statements)

References 1 publication

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“…After considering BSFC, emissions and elements of NVH, it may be argued that the most optimal operating window for the CDA+VVA engine discussed in this study would be between 1 bar to 2 bar BMEP and 1000rpm to 3500rpm engine speed. Studies by [5], [8] and [11] confirm similar operating windows with [11] pointing out the inclusion of the NEDC (New European Driving Cycle) operating points within this selected CDA operating window thereby affirming to an extent the usefulness of CDA and VVA in this region.…”

Section: Discussionmentioning

confidence: 62%

“…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%

“…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. BMEP and engine speed were used as the operating condition comparison basis by which to demonstrate the possibility of performance improvements in terms of BSFC.…”

Section: Discussionmentioning

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: Discussionmentioning

confidence: 62%

Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

See 1 more Smart Citation

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

Kuruppu

Pesiridis

Rajoo

2014

SAE Technical Paper Series

View full text Add to dashboard Cite

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“…Regarding the mode changes, hardware-specific requirements like timing issues to avoid damage to the system [18,28,29] typically crop up. Other authors mention that changes of the actuation of the throttle, the ignition, and possibly the cam timing [11,[30][31][32] are necessary, or they state that improved software [18,26,33] is required for mode changes. While the authors of Reference [17] provide detailed information regarding the control strategy, these results are only valid for the particular system they use, and the control strategy is also only provided schematically with no experimental verification.…”

Section: Introductionmentioning

confidence: 99%

Practical Aspects of Cylinder Deactivation and Reactivation

2021

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Cylinder deactivation is an effective measure to reduce the fuel consumption of internal combustion engines. This paper deals with several practical aspects of switching from conventional operation to operation with deactivated cylinders, i.e., gas spring operation with closed intake and exhaust valves. The focus of this paper lies on one particular quantity-controlled stoichiometrically-operated engine where the load is controlled using the valve timing. Nevertheless, the main results are transferable to other engines and engine types, including quality-controlled engines. The first aspect of this paper is an analysis of the transition from fired to gas spring operation, and vice versa, as well as the gas spring operation itself. This is essential for mode changes, such as cylinder deactivation or skip-firing operation. Simulation results show that optimizing the valve timing in the last cycle before deactivating/first cycle after reactivating a cylinder, respectively, is advantageous. We further show that steady-state gas spring operation is reached after approximately 6 s regardless of the initial conditions and the engine speed. The second aspect of this paper experimentally verifies the advantage of optimized valve timings. Furthermore, we show measurements that demonstrate the occurrence of an unavoidable torque ripple, especially when the transition to and from the deactivated cylinder operation is performed too quickly. We also confirm with our experiments that a more gradual mode transition reduces the torque drop.

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“…Various studies have been conducted on cylinder deactivation technology. More of them were focused on the cylinder deactivation mechanism [9][10][11], the noise, vibration, and harshness due to cylinder deactivation operation [12,13], misfire detection [14], or air fuel ratio control logic [15]. The fuel economy improvement of cylinder deactivation presented by previous studies was between 6% and 22%, and it significantly varied depending on the characteristics and control of the applied vehicle [16][17][18][19][20].…”

Section: Introductionmentioning

confidence: 99%

Estimation of Fuel Economy Improvement in Gasoline Vehicle Using Cylinder Deactivation

et al. 2018

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Cylinder deactivation is a fuel economy improvement technology that has attracted particular attention recently. The currently produced cylinder deactivation engines utilize fixed-type cylinder deactivation in which only a fixed number of cylinders are deactivated. As fixed-type cylinder deactivation has some shortcomings, variable-type cylinder deactivation with no limit on the number of deactivated cylinders is under research. For variable-type cylinder deactivation, control is more complicated and production cost is higher than fixed-type cylinder deactivation. Therefore, it is necessary to select the cylinder deactivation control method considering both advantages and disadvantages of the two control methods. In this study, a fuel economy prediction simulation model was created using the measurement data of various vehicles with engine displacements of 1.0–5.0 L. The fuel economy improvement of fixed-type cylinder deactivation was compared with that of variable-type cylinder deactivation using the created simulation. As a result of examining the fuel economy improvement of the test vehicle in the FTP-75 driving cycle, the improvement was 2.2–10.0% for fixed-type cylinder deactivation and 2.2–12.8% for variable-type cylinder deactivation. Furthermore, the effect of the engine load on fuel economy improvement under cylinder deactivation and the effect of changes in engine control were examined via a simulation.

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Meta - CVD System An Electro-Mechanical Cylinder and Valve Deactivation System

Cited by 21 publications

References 1 publication

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

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

Practical Aspects of Cylinder Deactivation and Reactivation

Estimation of Fuel Economy Improvement in Gasoline Vehicle Using Cylinder Deactivation

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