Neuer Ottomotor mit Direkteinspritzung und Doppelaufladung von Volkswagen

Krebs, Rudolf; Szengel, Rüdiger; Middendorf, Hermann; Sperling, Helmut; Siebert, W.; Theobald, Jörg; Michels, Karsten

doi:10.1007/bf03225370

Cited by 7 publications

(2 citation statements)

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“…The engine used in this study was the Volkswagen 1.4l-TSI spark-ignition four-cylinder engine. It was designed with single continuously variable cam phasers for the intake camshaft and twin charger technology [25, 26]. It provides intake air pressure up to 2.5 bar by an in-line supercharger and turbo charger.…”

Section: Highly Charged Si Enginementioning

confidence: 99%

“…For this purpose the RCARS measurements could not be used directly because the standard deviation due to cycle-to-cycle variations, beam steering, and degradation of phase matching induced by temperature gradients and engine vibrations was about 25 K. During engine operation without firing, a CARS standard deviation of 17 K was achieved. In contrast to this, at laboratory conditions a standard deviation of 10–12 K is typical for this temperature range [12, 24]. Therefore the curve of the calculated isentropic temperature is fitted to several RCARS temperature measurements taken at different crank angles during the compression stroke.…”

Section: Introductionmentioning

confidence: 99%

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Investigation of compression temperature in highly charged spark-ignition engines

Birkigt

Michels

Theobald

et al. 2011

International Journal of Engine Research

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One of the critical parameters for the occurrence of spark-knock and pre-ignition of highly charged spark-ignition (SI) engines is the compression temperature. The investigation of the compression temperature and a better understanding of the combustion behaviour inside the combustion chamber are of great importance for avoiding these phenomena and also for further downsizing of engines. Pure rotational coherent anti-Stokes Raman spectroscopy (RCARS) is an innovative tool providing information on the compression temperature by using only two small line-of-sight optical accesses on the cylinder wall. In this work, RCARS measurements were performed in motored and fired operation, and the results obtained from RCARS spectra have been used in combination with isentropic calculations to improve the accuracy of the compression temperature determination. Studies on the compression temperature by the variation of the intake temperature, the engine load, and the fuel were conducted and the influence of evaporation enthalpy on the compression temperature is discussed.

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Section: Highly Charged Si Enginementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%