The Influence of Variable Valve Actuation on the Part Load Fuel Economy of a Modern Light-Duty Diesel Engine

Lancefield, Tim

doi:10.4271/2003-01-0028

Cited by 35 publications

(18 citation statements)

References 7 publications

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“…The aim of this work is to design a controller that minimizes the fuel consumption and emissions along a driving cycle. The combustion performance with respect to BSFC, brake-specific oxides of nitrogen (BSNOx), and particulate emissions depends highly on combustion rate and air-fuel ratio (AFR), Lancefield [2003]. The ignition timing depends on advanced fuel injection timing and LIVC timing, Murata et al [2006].…”

Section: Problem Formulationmentioning

confidence: 99%

Air-Path Model Predictive Control of a Heavy-Duty Diesel Engine with Variable Valve Actuation

Gelso

Lindberg

2014

IFAC Proceedings Volumes

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In this paper, a model-based strategy for the air-path, fuel injection timing, and fuel pressure control of a heavy-duty Diesel engine is presented. The engine system is a six-cylinder Diesel engine, equipped with a dual-stage fixed geometry turbo system and a variable valve actuation (VVA) system. The VVA operates on the intake valves, and realizes a late Miller combustion cycle. The control strategy implemented is a multilinear-model predictive control (MPC), which manipulates the intake valve hold and closure timing, the fuel injection timing, and the needle opening pressure. The MPC objectives are: (i) to keep NOx emissions under a reference level, (ii) to keep the air-fuel ratio over a certain reference, while (iii) minimizing fuel consumption under other constraints. The use of a model predictive control strategy is motivated by the fact that the system is a multi-input multi-output system, with several constraints applied to it. This paper presents the applied control strategy and simulation results illustrating the potential of the proposed control. The simulation results show that the control strategy is applicable, and that the fuel consumption is minimized, but also that further refinements are required.

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Section: Problem Formulationmentioning

confidence: 99%

Air-Path Model Predictive Control of a Heavy-Duty Diesel Engine with Variable Valve Actuation

Gelso

Lindberg

2014

IFAC Proceedings Volumes

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“…Engine valvetrain systems can be generally grouped into cam-based and camless. A cam-based valvetrain system is based upon the traditional cam-system to drive the engine intake and exhaust valves with limited control over valve timing and/or lift [7]. A camless system drives individual engine valve directly with electromagnetic [8,9,10,11], electro-pneumatic [12][13], or electrohydraulic [14] VVA systems.…”

Section: Introductionmentioning

confidence: 99%

Progress in Camless Variable Valve Actuation with Two-Spring Pendulum and Electrohydraulic Latching

Lou¹,

Deng²,

Wen³

et al. 2013

SAE Int. J. Engines

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Camless Variable Valve Actuation (VVA) technologies have been known for improving fuel economy, reducing emissions, and enhancing engine performance. VVA can be divided into electromagnetic , electro-hydraulic, and electropneumatic actuation. A family of camless VVA designs (called LGD-VVA or Gongda-VVA) has been presented in an earlier SAE publication (SAE 2007-01-1295) that consists of a two-spring actuation, a bypass passage, and an electrohydraulic latch-release mechanism. The two-spring pendulum system is used to provide efficient conversion between the moving mass kinetic energy and the spring potential energy for reduced energy consumption and to be more robust to the operational temperature than the conventional electrohydraulic actuation; and the electrohydraulic mechanism is intended for latch-release function, energy compensation and seating velocity control. This paper presents the prototype design of a variable valve-time and two-lift LGD-VVA with bench and engine test results. The designed actuator is able to achieve 3 ms opening and closing response time with satisfactory valve seating velocity and low energy consumption. This is all achieved with a cost-effective design and open-loop control.

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“…Gale [1], however, has pointed out that, at US2007 and Euro4, these methods are reaching the limit of their practical effectiveness and other methods have become necessary. Some representative methods of reducing incylinder emissions are listed [1,[3][4][5][6][7][8] (HCCI) provides spectacular decreases in NO x .…”

Section: Introductionmentioning

confidence: 99%

An investigation of mixture formation and in-cylinder combustion processes in direct injection diesel engines using group-hole nozzles

Gao

Matsumoto

Namba

et al. 2009

International Journal of Engine Research

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Mixture properties of the transient fuel spray injected by group-hole nozzles were quantitatively studied in a constant volume chamber via the laser absorption scattering (LAS) technique, and compared with conventional single-hole nozzles. Specific areas investigated included non-evaporating and evaporating ambient conditions, and the conditions of free spray and spray impinging on a flat wall. The particular emphasis was on the effect of one of the key parameters of the group-hole nozzle structure, namely, the interval between orifices. Subsequently, in-cylinder ignition and combustion processes were investigated by direct flame visualization in a single-cylinder optical research engine using the group-hole nozzle and the standard multi-hole nozzle, together with heat release analysis. Results show that the grouphole nozzle can produce a smaller Sauter mean diameter (SMD) of droplets under the nonevaporating condition. Under the evaporating condition, for the free spray cases, there exists a trade-off between the fuel evaporation and the spray penetration in the application of the group-hole nozzle. With the increase in interval between orifices, the ratio of evaporation increases, but the spray tip penetration decreases. For the spray impinging on a flat wall, the group-hole nozzle can enhance the spray tip penetrations to some extent compared with the single-hole nozzles. Flame images taken in a direct injection optical engine show that the enhancement of the fuel atomization and evaporation by the group-hole nozzle may contribute to a decrease in overall flame luminosity level, suggesting reduced soot formation in diesel engines.

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The Influence of Variable Valve Actuation on the Part Load Fuel Economy of a Modern Light-Duty Diesel Engine

Cited by 35 publications

References 7 publications

Air-Path Model Predictive Control of a Heavy-Duty Diesel Engine with Variable Valve Actuation

Air-Path Model Predictive Control of a Heavy-Duty Diesel Engine with Variable Valve Actuation

Progress in Camless Variable Valve Actuation with Two-Spring Pendulum and Electrohydraulic Latching

An investigation of mixture formation and in-cylinder combustion processes in direct injection diesel engines using group-hole nozzles

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