The Electro-Hydraulic Valve Actuation (EHVA) for Medium Speed Diesel Engines - Development Steps with Simulations and Measurements

Herranen, Mika; Huhtala, Kalevi; Vilenius, Matti; Liljenfeldt, Gösta

doi:10.4271/2007-01-1289

Cited by 23 publications

(3 citation statements)

References 3 publications

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“…19 The engine was connected to an electric motor, which also allowed running in motored mode. In addition, the gas exchange valves were controlled by electro-hydraulic valve actuators (EHVA) instead of the traditional mechanical camshaft, providing high flexibility in valve timing 20 for the gas exchange phase. Moreover, the fuel system permitted to change injection pressure, duration and SOI.…”

Section: Methodsmentioning

confidence: 99%

Influence of the in-cylinder gas density and fuel injection pressure on the combustion characteristics in a large-bore diesel engine

Imperato

Kaario

Sarjovaara

et al. 2015

International Journal of Engine Research

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Engine research is going toward higher specific power and downsizing. This topic is of increasing interest in compression-ignition engines, due to high output demand and more restrictive legislation. This study focuses on the influence of in-cylinder gas density and fuel injection pressure on the combustion and performance in a large-bore medium speed research engine. From a baseline setup close to a commercial engine, the specific power density was augmented by higher in-cylinder pressure ranging from 200 to 300 bar. This corresponds to gas density between 65 and 90 kg/m 3 at top dead center. In addition, fuel injection pressure was varied between 1500 and 2400 bar. Based on the literature, this is the first study to report engine operation with 300 bar cylinder pressure. The results show that ignition delay is significantly reduced by increasing the injection pressure, while gas density has only a moderate effect. In addition, specific nitrogen oxides increase strongly with higher injection pressure but only moderately with higher gas density. Running with high gas density permits to improve the engine fuel economy. The test outcomes also show that the combustion duration can be decreased by increasing the in-cylinder density.

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Section: Methodsmentioning

confidence: 99%

Influence of the in-cylinder gas density and fuel injection pressure on the combustion characteristics in a large-bore diesel engine

Imperato

Kaario

Sarjovaara

et al. 2015

International Journal of Engine Research

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“…Pilot ignited dual fuel combustion is highly sensitive to mixture global equivalence ratio [16,21] [22]. Main engine specifications are presented The engine is instrumented with the necessary equipment required for its operation and control, as illustrated in Figure 2.…”

Section: Boundariesmentioning

confidence: 99%

Impact of diesel pilot distribution on the ignition process of a dual fuel medium speed marine engine

Valladolid

Tunestål

Monsalve‐Serrano

et al. 2017

Energy Conversion and Management

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“…A further improvement of the VVA concept application is then represented by the development of cam-less devices, based on electro-magnetic, electro-hydraulic or electro-pneumatic systems. While the first ones present some problems, such as those related to the valve position in failure mode or to the seating velocity, systems based on hydraulic actuators (Lotus-Eaton, AVL-Bosch, Sturman, Cargine Engineering, Ford 22–27 ) appear to be more promising, showing potentially good performances in terms of lift and time control, along with other operative advantages, while the main drawback is represented by the power consumption limitation.…”

Section: State Of Art Reviewmentioning

confidence: 99%

Required time response of a variable valve actuator equiping a hybrid pneumatic–combustion engine

Basbous

Younès

Ilinca

et al. 2012

International Journal of Engine Research

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This work is a part of a research program that aims to modify a conventional internal combustion engine and turn it into a hybrid pneumatic–combustion engine. The hybrid pneumatic–combustion engine should be able to convert mechanical energy into compressed air and convert compressed air back into mechanical energy. The potential application for the concept is any use of the internal combustion engine where the load oscillates between a negative and a positive value, such as automobiles and hybrid wind diesel systems for remote area power generation. In the first application, during vehicle decelerations, an excess of power occurs, and a negative load could be applied to the engine, whereas during vehicle accelerations, a positive load is applied. In the second application, if the generated wind power is higher than consumption demand, then the load applied to the engine could be negative, and if the generated wind power is lower than consumption demand, then the load is positive. In previous work, we exposed an optimization followed by a fuel-saving evaluation of a new hybrid pneumatic–combustion engine concept that uses a variable valve actuator system. The optimization of the valve actuation was based on ideal thermodynamic cycle modeling, assuming therefore an instant response of the variable valve actuator system. In the present work, a more realistic analysis of the system is provided by taking into consideration the dynamic response of the variable valve actuator system. Variable valve actuators have been widely studied for optimizing performance and fuel consumption of the internal combustion engine, especially in spark-ignition engines. For these engines, it is possible to reduce the pumping losses and to optimize the engine filling by controlling the intake and exhaust valve opening and closing angles, as well as their lifts. However, the variation of valve actuation crank angles required in a conventional internal combustion engine is significantly smaller than the one required in the hybrid pneumatic–combustion engine. This paper describes, through simulation, how the valve time response affects the performance of the hybrid pneumatic–combustion engine and recommends a required valve time response.

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The Electro-Hydraulic Valve Actuation (EHVA) for Medium Speed Diesel Engines - Development Steps with Simulations and Measurements

Cited by 23 publications

References 3 publications

Influence of the in-cylinder gas density and fuel injection pressure on the combustion characteristics in a large-bore diesel engine

Influence of the in-cylinder gas density and fuel injection pressure on the combustion characteristics in a large-bore diesel engine

Impact of diesel pilot distribution on the ignition process of a dual fuel medium speed marine engine

Required time response of a variable valve actuator equiping a hybrid pneumatic–combustion engine

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