Fuel Economy Improvement Using Combined CAI and Cylinder Deactivation (CDA) - An Initial Study

“…The authors' simulations showed an almost 15% fuel saving. Douglas et al [7] investigated the effect of Cylinder Deactivation (CDA) and Controlled Auto Ignition (CAI) on fuel consumption and emissions. Cylinder Deactivation (CDA) is used during low load conditions, when a number of cylinders are deactivated.…”

Section: Introductionmentioning

confidence: 99%

Optimisation of the vehicle transmission and the gear-shifting strategy for the minimum fuel consumption and the minimum nitrogen oxide emissions

Oglieve

Mohammadpour

Rahnejat

2017

Proceedings of the Institution of Mechanical Engineers, Part D:

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“…Finally, the higher exhaust temperature as a result of CDA aid the effective functioning of the exhaust catalyst. A study conducted by Douglas et al 7 simulated the effect of CDA on emissions and fuel economy, based upon the NEDC. It was found that efficiency can be improved, but only for specific parts of the fuel map.…”

Section: Introductionmentioning

confidence: 99%

Effect of cylinder de-activation on the tribological performance of compression ring conjunction

Bewsher

Turnbull

Mohammadpour

et al. 2016

Proceedings of the Institution of Mechanical Engineers, Part J:

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The paper presents transient thermal-mixed-hydrodynamics of piston compression ring-cylinder liner conjunction for a 4-cylinder 4-stroke gasoline engine during a part of the New European Drive Cycle (NEDC). Analyses are carried out with and without cylinder de-activation technology in order to investigate its effect upon the generated tribological conditions. In particular, the effect of cylinder deactivation upon frictional power loss is studied. The predictions show that overall power losses in the piston-ring cylinder system worsen by as much as 10% because of the increased combustion pressures and liner temperatures in the active cylinders of an engine operating under cylinder deactivation. This finding shows the down-side of this progressively employed technology, which otherwise is effective in terms of combustion efficiency with additional benefits for operation of catalytic converters. The expounded approach has not hitherto been reported in literature.

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“…In this paper terms "high speed" and "low speed" refer to relatively high and relatively low speeds in the NEDC range. Conditions shown in figure 3 are taken from [7]. It should be noted that different transmission gears are active with different driving conditions.…”

Section: Resultsmentioning

confidence: 99%

“…Therefore, the use of CDA is somewhat limited by the NVH refinement because of the resulting greater fluctuations in the output power torque [2,6]. Douglas et al [7] studied the effect of CDA mode in comparison with the normal engine mode during the NEDC cycle. A suitable region for the CDA operation was determined based on the BMEP.…”

Section: Introductionmentioning

confidence: 99%

The Effect of Cylinder De-Activation on Thermo-Friction Characteristics of the Connecting Rod Bearing in the New European Drive Cycle (NEDC)

Mohammadpour¹,

Rahmani²,

Rahnejat³

2014

SAE Technical Paper Series

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This paper presents an investigation of Cylinder De-Activation (CDA) technology on the performance of big end bearings. A multi-physics approach is used in order to take into account more realistic dynamic loading effects on the tribological behavior. The power loss, minimum film thickness and maximum temperature of big end bearings have been calculated during maneuver pertaining to the New European Driving Cycle (NEDC). Results show that bearing efficiency runs contrary to efficiency gained through combustion and pumping losses. Under CDA mode, the power loss of big end bearings is more than the power loss under engine normal mode. The problem is predominant at higher engine speeds and higher Brake mean Effective Pressures (BMEP) in active cylinders. It is also observed that the minimum film thickness is reduced under the CDA mode. This can affect wear performance. In addition, same behavior is noted for the maximum temperature rise which is higher under CDA.

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Fuel Economy Improvement Using Combined CAI and Cylinder Deactivation (CDA) - An Initial Study

Cited by 33 publications

References 10 publications

Optimisation of the vehicle transmission and the gear-shifting strategy for the minimum fuel consumption and the minimum nitrogen oxide emissions

Optimisation of the vehicle transmission and the gear-shifting strategy for the minimum fuel consumption and the minimum nitrogen oxide emissions

Effect of cylinder de-activation on the tribological performance of compression ring conjunction

The Effect of Cylinder De-Activation on Thermo-Friction Characteristics of the Connecting Rod Bearing in the New European Drive Cycle (NEDC)

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