SAE Technical Paper Series 2003
DOI: 10.4271/2003-01-0038
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Using Camless Valvetrain for Air Hybrid Optimization

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Cited by 62 publications
(46 citation statements)
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“…Increasing this pressure exposes the engine to higher mechanical stress level. A 180 bars-pressure is a common limitation of the cylinder pressure accepted by most turbocharged Diesel engines [38], In the present study, the threshold for maximal pressure have been considered 200 bars, considering that the modeled cycle is the ideal one and that the real cycle will produce less pressure because of different losses. This threshold is to be respected while choosing the ratio of the pneumatic power to the total power for each operation point.…”
Section: Mode 3: Four-stroke Pneumatic-combustion Ideal Motor Cyclementioning
confidence: 99%
“…Increasing this pressure exposes the engine to higher mechanical stress level. A 180 bars-pressure is a common limitation of the cylinder pressure accepted by most turbocharged Diesel engines [38], In the present study, the threshold for maximal pressure have been considered 200 bars, considering that the modeled cycle is the ideal one and that the real cycle will produce less pressure because of different losses. This threshold is to be respected while choosing the ratio of the pneumatic power to the total power for each operation point.…”
Section: Mode 3: Four-stroke Pneumatic-combustion Ideal Motor Cyclementioning
confidence: 99%
“…This characteristic allows suppressing idling phases and reduces the use of the conventional combustion mode. A fuel saving up to 40% can be reached depending on the driving cycle [4][5][6].…”
Section: Pneumatic Motor Modementioning
confidence: 99%
“…In order to be independent of a specific technology [6,[8][9][10][11], a simple kinematic model of the charging valve has been developed, as displayed in Figure 8.…”
Section: Charging Valve Kinematicsmentioning
confidence: 99%
“…The pneumatic hybrid also makes it possible to completely shut off the engine at idling like for instance at a stoplight, which in turn contributes to lower fuel consumption. [3,4,5,6] In this study a single-cylinder engine was used. In reality, in for instance a heavy duty truck, one cylinder will not be enough to take full advantage of the pneumatic hybrid.…”
Section: Pneumatic Hybridmentioning
confidence: 99%
“…In order to run the engine as a pneumatic hybrid, a 50 litre pressure tank has to be connected to the cylinder head. Tai et al [3] describe an intake air switching system in which one inlet valve per cylinder is fed by either fresh intake air or compressed air from the pressure tank. Andersson et al [8] describe a dual valve system where one of the intake ports has two valves, A more thorough and detailed description of the pneumatic valve spring arrangement and its characteristics can be found in [2].…”
Section: Figure 1 the Engine Used In This Studymentioning
confidence: 99%