Variable Valve Timing Implemented with a Secondary Valve on a Four Cylinder SI Engine

Vogel, Olivier; Roussopoulos, Kimon; Guzzella, Lino; Czekaj, James

doi:10.4271/970335

Cited by 17 publications

(6 citation statements)

References 13 publications

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“…The resulting micro turbulences in the area between valve and valve seat effectively supports a mechanical mixture preparation and helps to compensate the reduction of in-cylinder turbulence which is principally associated with unthrottled load control by means of early intake valve closing. Vogel et al [17] investigated the effect of EIVC on fuel consumption and pumping losses using a Ford Zetec, 4 cylinder, 2.0l engine fitted with secondary valve assembly between the cylinder head and the original intake manifold of the engine. The aim was to implement EIVC with the secondary valve.…”

Section: Introductionmentioning

confidence: 99%

Part-load performance and emissions analysis of SI combustion with EIVC and throttled operation and CAI combustion

Ojapah¹,

Zhang²,

Zhao³

2013

Internal Combustion Engines: Performance, Fuel Economy and Emissions

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Section: Introductionmentioning

confidence: 99%

Part-load performance and emissions analysis of SI combustion with EIVC and throttled operation and CAI combustion

Ojapah¹,

Zhang²,

Zhao³

2013

Internal Combustion Engines: Performance, Fuel Economy and Emissions

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“…The resulting micro-turbulences in the region between the valve and valve seat effectively support the mixture preparation and help to compensate the reduction in in-cylinder turbulence which is principally associated with unthrottled load control by means of EIVC. Vogel et al 3 investigated the effect of EIVC on fuel consumption and pumping losses on a four-cylinder gasoline engine fitted with a secondary valve assembly between the cylinder head and the original intake manifold of the engine. The aim was to implement EIVC with the secondary valve.…”

Section: Introductionmentioning

confidence: 99%

Effects of ethanol on combustion and emissions of a gasoline engine operating with different combustion modes

Ojapah

Zhao

Zhang

2016

International Journal of Engine Research

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The introduction of fuel economy and CO2 emission legislations for passenger cars in many countries and regions has spurred the research and development of more efficient gasoline engines. The pumping loss at part-load operations is a major factor for the higher fuel consumption of spark ignition (SI) gasoline engines than the diesel engines. Various approaches have been identified to reduce the pumping loss at part-load operations, leading to improved fuel economy, including Early Intake Valve Closing (EIVC), Positive Valve Overlap (PVO) and Controlled Auto-Ignition (CAI) combustion. On the other hand, in order to reduce the CO2 emissions from the fossil fuel, ethanol produced from renewable resources is becoming widely used in the gasoline engine. In this paper, the performance, combustion and emissions were measured, analyzed and compared between gasoline and its mixture with ethanol (E15 and E85) at a typical part-load condition when a direct injection gasoline engine was operated with the CAI combustion by means of the negative valve overlap (NVO) and SI combustion by means of the intake throttled, EIVC and PVO. An electro hydraulic actuated camless system enabled the engine to be operated with CAI combustion and SI combustion of different valve timings and durations at the same load. The results showed that the CAI combustion reduces NOx emissions by more than 90%. The PVO results in better mixture preparations and improved combustion efficiency and best fuel economy compared to all the other modes. The EIVC operation led to a moderate improvement in the fuel conversion efficiency over the throttled SI operation but it was characterised by the slowest combustion and worst HC and CO emissions. Fewer and smaller particles numbers were detected in EIVC using E0 and E15 fuel blends. Using ethanol blends reduces the knocking combustion in CAI modes by about 50%. The use of E85 resulted in an increased number of particulate emissions in EIVC but increased ISFC in all the modes. The particulate emission results showed that soot is the dominant particle in the exhaust.

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“…Another possibility is to control the air flow into the intake manifold with an electronic throttle [1,2], or the air flow into the cylinders. This latter actuation can be achieved by adjusting the cam timing of the intake valves [3], by implementing independent electro-hydraulically controlled intake valves [4], by secondary (or port) throttles [5], or by using secondary valves in series with conventional intake valves [6]. The common element of these actuators is that they allow control of the air flow into the cylinders by adjusting the effective area of the intake valves.…”

Section: Introductionmentioning

confidence: 99%

“…Three of these methods, namely variable intake cam timing, variable intake valve control, and series secondary valves can also be used to improve fuel economy. This is because, by controlling the breathing process of the engine, it is possible to raise the average manifold pressure, and thereby reduce pumping losses in the engine [4,6].…”

Section: Introductionmentioning

confidence: 99%

Dynamic control of a SI engine with variable intake valve timing

Kang

Grizzle

2003

Intl J Robust & Nonlinear

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SUMMARYEngines equipped with a means to actuate air flow at the intake valve can achieve superior fuel economy performance in steady state. This paper shows how modern nonlinear design techniques can be used to control such an engine over a wide range of dynamic conditions. The problem is challenging due to the nonlinearities and delays inherent in the engine model, and the constraint on the air flow actuator. The controller is designed on the basis of a mean-value model, which is derived from a detailed intake stroke model. The control solution has two novel features. Firstly, a recovery scheme for integrator wind-up due to input constraints is directly integrated into the nonlinear control design. The second novel feature is that the control Lyapunov function methodology is applied to a discrete-time model. The performance of the controller is evaluated and compared with a conventionally controlled engine through simulation on the detailed engine model.

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Variable Valve Timing Implemented with a Secondary Valve on a Four Cylinder SI Engine

Cited by 17 publications

References 13 publications

Part-load performance and emissions analysis of SI combustion with EIVC and throttled operation and CAI combustion

Part-load performance and emissions analysis of SI combustion with EIVC and throttled operation and CAI combustion

Effects of ethanol on combustion and emissions of a gasoline engine operating with different combustion modes

Dynamic control of a SI engine with variable intake valve timing

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