The Volkswagen PCI Stratified Charge Concept-Results from the 1.6 Liter Air Cooled Engine

Brandstetter, Walter; Decker, G.; Schäfer, Heinz; Steinke, D

doi:10.4271/741173

Cited by 10 publications

(3 citation statements)

References 3 publications

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“…Since the setup of GDI solutions for passive prechambers is difficult and time-consuming, "active" (or "stratified") prechambers have been developed. Active prechambers are equipped with a dedicated fueling system, which can be a valve, as proposed by Honda [29] and General Motors [30], or an injector, as proposed instead by Volkswagen [31], Porsche [32], and more recently by MAHLE [33][34][35][36]. Figure 1b shows the conceptual drawing of an active prechamber fueled by a dedicated injector.…”

Section: Introductionmentioning

confidence: 99%

CFD Analysis of the Fuel–Air Mixture Formation Process in Passive Prechambers for Use in a High-Pressure Direct Injection (HPDI) Two-Stroke Engine

et al. 2020

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The research on two-stroke engines has been focused lately on the development of direct injection systems for reducing the emissions of hydrocarbons by minimizing the fuel short-circuiting. Low temperature combustion (LTC) may be the next step to further improve emissions and fuel consumption; however, LTC requires unconventional ignition systems. Jet ignition, i.e., the use of prechambers to accelerate the combustion process, turned out to be an effective way to perform LTC. The present work aims at proving the feasibility of adopting passive prechambers in a high-pressure, direct injection, two-stroke engine through non-reactive computational fluid dynamics analyses. The goal of the analysis is the evaluation of the prechamber performance in terms of both scavenging efficiency of burnt gases and fuel/air mixture formation inside the prechamber volume itself, in order to guarantee the mixture ignitability. Two prechamber geometries, featuring different aspect ratios and orifice numbers, were investigated. The analyses were replicated for two different locations of the injection and for three operating conditions of the engine in terms of revolution speed and load. Upon examination of the results, the effectiveness of both prechambers was found to be strongly dependent on the injection setup.

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Section: Introductionmentioning

confidence: 99%

CFD Analysis of the Fuel–Air Mixture Formation Process in Passive Prechambers for Use in a High-Pressure Direct Injection (HPDI) Two-Stroke Engine

et al. 2020

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“…Despite the benefits of lean combustion, lower burn velocities result in higher cyclic variability, requiring a greater source of energy to ignite the mixture [16]. Among other technologies used to improve the amount of ignition energy, the use of prechamber ignition system (PCIS) is already well stablished for lean combustion [17][18][19] and has already been used by the automotive industry for commercial applications [20][21][22][23][24][25]. However, only few studies have published results of PCIS in vehicular conditions.…”

Section: Introductionmentioning

confidence: 99%

Evaluation of a stratified prechamber ignition concept for vehicular applications in real world and standardized driving cycles

et al. 2019

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“…A sketch of this engine can be found in Figure 2.12. In the same 70's decade, Volkswagen group leaded by Walter R. Brandstetter developed a pre-chamber injection stratified charge engine (PCI), using a divided combustion chamber with a spherical valveless pre-chamber [64,65], founding good fuel consumption and low emissions, specially when operating with lean mixtures without driving issues caused by the stratified charge in the road testing [66]. The sketch of the pre-chamber application in the engine can be found in Figure 2.13.…”

Section: Active Large Pre-chamber Applicationsmentioning

confidence: 99%

Implementation and Analysis of the Pre-Chamber Ignition Concept in a SI Engine for Passenger Car Applications

Martínez Hernándiz

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The global greenhouse gas emissions increase since the start of the Industrial Revolution has become a serious hazard to human life. In addition to power generation and industry, transportation, with the rise in the total vehicle number in the last decades, is one of the main contributors to this exponential increase of global warming-causing gases. In fact, cities such as Barcelona or Madrid, among many others, are imposing traffic restrictions to mitigate this situation. However, mankind is still on time to reverse this negative tendency and fix the environmental issue for the upcoming generations.The main goal of the present Thesis focuses on the study, implementation and analysis of the passive pre-chamber ignition concept in a near-future light-duty passenger car application. To be more specific, the investigation addresses the physical phenomena involving the combustion process when pre-chamber ignition system is used in a spark-ignition engine. Then, some strategies to improve thermal efficiency while employing this concept are applied. Finally, with all the knowledge gathered, basic guidelines for a pre-chamber pre-design are presented.The first approach to the concept consists of its direct implementation in the engine, obtaining experimental results in three different operating conditions in terms of engine load and speed. Furthermore, different prechamber geometries are also evaluated. Although its direct implementation is relatively straightforward by exchanging the spark plug, understanding some of the relevant phenomena related to the combustion process, such as gas exchange or jet-tip penetration, is extremely difficult without the support of computational tools. This is the main reason supporting the use of 1D numerical tools in the present Thesis, since with proper modeling based on experimental data, further knowledge can be obtained in those situations where experimental evaluations are not feasible. These 1D tools have the benefits of their low computational cost and their ability to provide reasonably good results in a short period of time. ix xv[8] F. D. Sabatino, P. J. Martinez-Hernandiz, R. N. Rosa, and I. Ekoto. "Investigation of the effects of passive pre-chamber nozzle pattern and ignition system on engine performance and emissions". International Journal of Engine Research 0 (0), 2022.

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The Volkswagen PCI Stratified Charge Concept-Results from the 1.6 Liter Air Cooled Engine

Cited by 10 publications

References 3 publications

CFD Analysis of the Fuel–Air Mixture Formation Process in Passive Prechambers for Use in a High-Pressure Direct Injection (HPDI) Two-Stroke Engine

CFD Analysis of the Fuel–Air Mixture Formation Process in Passive Prechambers for Use in a High-Pressure Direct Injection (HPDI) Two-Stroke Engine

Evaluation of a stratified prechamber ignition concept for vehicular applications in real world and standardized driving cycles

Implementation and Analysis of the Pre-Chamber Ignition Concept in a SI Engine for Passenger Car Applications

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