Thermodynamical and Mechanical Approach Towards a Variable Valve Train for the Controlled Auto Ignition Combustion Process

Lang, Oliver; Salber, Wolfgang; Hahn, Joachim; Pischinger, Stefan; Hortmann, K.; Bücker, Christian Siegfried Hermann

doi:10.4271/2005-01-0762

Cited by 45 publications

(29 citation statements)

References 4 publications

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“…The concept of re-breathing [8] might be more mechanically complicated but has an advantage in reduced heat losses since it can be operated without recompression. The combustion timing in HCCI can also be adjusted with the intake temperature by a thermal management system [9,10], but this need a heat recovery system.…”

mentioning

confidence: 99%

The Effect of Intake Temperature in a Turbocharged Multi Cylinder Engine operating in HCCI mode

Johansson¹,

Johansson²,

Tunestål³

et al. 2009

SAE Int. J. Engines

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The operating range in HCCI mode is limited by the excessive pressure rise rate and therefore high combustion induced noise. The HCCI range can be extended with turbocharging which enables increased dilution of the charge and thus a reduction of combustion noise. When the engine is turbocharged the intake charge will have a high temperature at increased boost pressure and can then be regulated in a cooling circuit. Limitations and benefits are examed at 2250 rpm and 400 kPa indicated mean effective pressure. It is shown that combustion stability, combustion noise and engine efficiency have to be balanced since they have optimums at different intake temperatures and combustion timings. The span for combustion timings with high combustion stability is narrower at some intake temperatures and the usage of external EGR can improve the combustion stability. It is found that the standard deviation of combustion timing is a useful tool for evaluating cycle to cycle variations. One of the benefits with HCCI is the low pumping losses, but when load and boost pressure is increased there is an increase in pumping losses when using negative valve overlap. The pumping losses can then be circumvented to some extent with a low intake temperature or EGR, leading to more beneficial valve timings at high load.

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confidence: 99%

The Effect of Intake Temperature in a Turbocharged Multi Cylinder Engine operating in HCCI mode

Johansson¹,

Johansson²,

Tunestål³

et al. 2009

SAE Int. J. Engines

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show abstract

“…CAI combustion is controlled by the charge temperature, composition and pressure and therefore prevents the use of direct controlling mechanisms such as is the case in spark ignited gasoline combustion and injection timed diesel combustion. This method requires a second exhaust event and is termed re-breathing [4,6,7]. By varying the amount of TRG in the fresh air/fuel mixture, obtained by early exhaust valve closure coupled with late intake valve opening, i.e.…”

Section: Problems In Controlling the Cai Enginementioning

confidence: 99%

CAI control and CAI/SI switching

Milovanović

Turner²

2007

HCCI and CAI Engines for the Automotive Industry

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“…By recirculating exhaust gas with a high thermal heat capacity the peak temperature can be kept in a low range and a reduction of NOx by 90-99% can be realised. The fuel consumption drops due to the increased efficiency up to 15% (Lang et al, 2005). However, instabilities arise in form of spatial and temporally distributed areas of ignition, which are sensitively depended on the temperature and the reaction's kinetics.…”

Section: Introductionmentioning

confidence: 99%

Control of future low Temperature Combustion Technologies with nonlinear Model based Predictive Control based on Neural Networks

Hoffmann

Seebach

Pischinger

et al. 2008

IFAC Proceedings Volumes

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Thermodynamical and Mechanical Approach Towards a Variable Valve Train for the Controlled Auto Ignition Combustion Process

Cited by 45 publications

References 4 publications

The Effect of Intake Temperature in a Turbocharged Multi Cylinder Engine operating in HCCI mode

The Effect of Intake Temperature in a Turbocharged Multi Cylinder Engine operating in HCCI mode

CAI control and CAI/SI switching

Control of future low Temperature Combustion Technologies with nonlinear Model based Predictive Control based on Neural Networks

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