A Comparative Study of Variable Camshaft Phasing and Port Throttling for Performance and Emissions

Duckworth, R. F.; Barker, L.

doi:10.4271/960580

Cited by 8 publications

(2 citation statements)

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“…Exhaust gas recirculation from the exhaust side to the air intake side in certain operating conditions will further reduce emissions (Klotzbach, Sari, & Dismon, 2003). The angular position of the cam shaft and thus the opening and closing timing of the valves with respect to the cylinder position is another degree of freedom in engine control (Duckworth & Barker, 1996).…”

Section: Drive Train Systemsmentioning

confidence: 99%

Automotive mechatronics

Schöner

2004

Control Engineering Practice

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A large share of automotive innovations consists of significant improvements in formerly pure mechanical systems which are made possible using integrated electronics together with complex information processing. Such mechatronic systems require a concurrent design of mechanical, electronical, and information processing sub-systems in order to reach the cost requirements of the automotive industry. The motivation for the use of mechatronics is discussed, as well as the most important technological challenges of the mechatronical approach. Mechatronical solutions for different automotive applications are presented. The driving factors for future development of mechatronics in the automotive sector are discussed. r

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Section: Drive Train Systemsmentioning

confidence: 99%

Automotive mechatronics

Schöner

2004

Control Engineering Practice

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“…Potential NOx improvements at part load are up to 80% [4] and the same report shows up to 50% improvement over the New European Driving Cycle (NEDC). Full load performance is also improved through use of a VVT system [7]. These benefits are primarily examined against engines without the technology equipped and typically compared for steady state only.…”

Section: Introductionmentioning

confidence: 99%

Application of Multi-Objective Optimization Techniques for Improved Emissions and Fuel Economy over Transient Manoeuvres

Corre

Mason

Steffen

et al. 2019

SAE Technical Paper Series

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This paper presents a novel approach to augment existing engine calibrations to deliver improved engine performance during a transient, through the application of multi-objective optimization techniques to the calibration of the Variable Valve Timing (VVT) system of a 1.0 litre gasoline engine. Current mature calibration approaches for the VVT system are predominantly based on steady state techniques which fail to consider the engine dynamic behaviour in real world driving, which is heavily transient.In this study the total integrated fuel consumption and engine-out NOx emissions over a 2-minute segment of the transient Worldwide Light-duty Test Cycle are minimised in a constrained multiobjective optimisation framework to achieve an updated calibration for the VVT control. The cycle segment was identified as an area with high NOx emissions. The optimisation framework was developed around a Mean Value Engine Model (MVEM) with representative engine controls which was validated against an engine tested on a dynamometer. The aim of this study was to demonstrate a practical benefit without having to significantly change the existing engine control strategy. Offline optimization with the MVEM model allows exploitation of workstation computational performance to effectively explore the calibration space, reducing both time and investment in engine testing.The initial simulation optimization results show a strong dominance of both fuel and NOx objectives with a potential reduction in fuel consumption and engine out NOX emissions of up to 5% and 18% respectively compared to the original steady-state based VVT calibration. Engine experimental results have confirmed that NOX emissions can be significantly reduced without any significant detriment to fuel economy over this 2min transient.

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Optimization of variable valve timing for maximizing performance of an unthrottled SI engine—a theoretical study

Sher

Bar-Kohany

2002

Energy

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A Comparative Study of Variable Camshaft Phasing and Port Throttling for Performance and Emissions

Cited by 8 publications

References 1 publication

Automotive mechatronics

Automotive mechatronics

Application of Multi-Objective Optimization Techniques for Improved Emissions and Fuel Economy over Transient Manoeuvres

Optimization of variable valve timing for maximizing performance of an unthrottled SI engine—a theoretical study

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