Die neue BMW Sechszylinder-Spitzenmotorisierung mit innovativem Aufladekonzept

Steinparzer, Fritz; Nefischer, Peter; Hiemesch, Detlef; Rechberger, Erwin

doi:10.1007/s35146-016-0107-3

Cited by 3 publications

(2 citation statements)

References 1 publication

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“…Turbo-lag can be defined as the time consumed by the turbo-charger in order to furnish sufficient boost pressure to the engine. [1][2][3] Turbo-lag improvement such as, by the numerical study, 3 power pulse development by Volvo, 4 simultaneous usage of both small and large turbochargers 5 etc. were deeply investigated.…”

Section: Introductionmentioning

confidence: 99%

Performance improvement of turbocharged SI engine by post-oxidation enhancement in exhaust gas in-homogeneity

Kumar

Moeeni

Kuboyama

et al. 2020

International Journal of Engine Research

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In this research, the improvement of mixing and pulsation in exhaust manifold with a design and implementation of bypass adapter at exhaust port were deeply investigated. This in-turn can improve the post-oxidation phenomena and hence emissions and engine performance could be enhanced. This research investigation includes 1-D, 3-D simulations and experimental validation on a 4-cylinder turbocharged spark ignition (SI) engine. Firstly, the 1-D and 3-D simulation models were developed and calibrated with the experimental results. Then, the simulations were used for the detailed investigation of mixing and pulsation in exhaust manifold with and without bypass adapter. Thereafter, experimental test for the post-oxidation were conducted with and without consideration of the bypass adapter and results were compared. From the simulation and experimental results, it was proven that by using bypass adapter at the exhaust port, the mixing of exhaust gas species was observed to be significantly improved to some extent. Also, the unbalance between exhaust port and turbocharger upstream gas species were reduced. This also reduced the exhaust gas pulsation. By the improvement of mixing between scavenged O2 and unburned gas species, the post-oxidation reaction was also noted to have improved and consequently the emissions and turbo-speed were found to be better that led to an improved IMEP and thermal efficiency of the engine.

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Section: Introductionmentioning

confidence: 99%

Performance improvement of turbocharged SI engine by post-oxidation enhancement in exhaust gas in-homogeneity

Kumar

Moeeni

Kuboyama

et al. 2020

International Journal of Engine Research

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show abstract

“…While the particulate matter problem was solved with the introduction of diesel particulate filters (DPF), current NO x limits are still a challenge. To achieve the NO x goals, BMW uses both Lean-NO x -Traps (LNT) and selective catalytic reduction systems (SCR-systems) [5][6][7].…”

Section: Introductionmentioning

confidence: 99%

Impact of cyclic lean–rich aging under DeSO x condition on the lean-gas light-off and hydrogen formation ability of a lean NO x trap (LNT)

Maurer¹,

Fortner²,

Holler³

et al. 2017

Automot. Engine Technol.

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In this paper, the aging impact of desulphation (DeSO x) procedures on lean NO x traps (LNT) was investigated. With accelerated aging procedures on an engine test bench and on a synthetic-gas test bench, LNTs were stressed with lean rich cycling under realistic desulphation conditions. Exhaust gas chassis dynamometer tests showed the impact on emissions of the lean rich treatment. High carbon monoxide (CO) slips were detected in NEDC tests during NO x regeneration (DeNO x). With light-off tests, the pattern of damage was further investigated. A pronounced deactivation in CO-rich gas conversion was found to be the main reason for the carbon monoxide emissions in the chassis dynamometer tests. A correlation between DeSO x duration (cumulated duration of rich pulses) and the inhibited CO conversion was observed. Determinations of oxygen storage capacities of aged catalysts indicated that the lean-rich cycling mainly damaged the ceria oxide of the LNT. Variations of the rich gas components indicated that hydrogen in the feed gas as well as in situ generated hydrogen out of feed gas components (steam reforming, water gas shift) is accountable for the degradation in carbon monoxide conversion in rich purges. Investigations for lower desulphation temperatures showed that the effect is negligible for temperature \350°C. Therefore, catalyst deactivation throughout NO x regeneration events with much lower temperatures than at DeSO x was not observed. As reference to other aging treatments used in the literature, samples aged hydrothermally at 750°C, a phosphorus poisoned and hydrothermally aged LNT as well as a LNT sample from a vehicle endurance run were compared to the DeSO x aged catalysts. All LNTs had the same conventional LNT coating.

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Scavenging Phenomena Based Post-oxidation in Exhaust Manifold of a Turbocharged Spark Ignition Engine

Kumar

Kuboyama

Hasegawa

et al. 2019

SAE Technical Paper Series

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Die neue BMW Sechszylinder-Spitzenmotorisierung mit innovativem Aufladekonzept

Cited by 3 publications

References 1 publication

Performance improvement of turbocharged SI engine by post-oxidation enhancement in exhaust gas in-homogeneity

Performance improvement of turbocharged SI engine by post-oxidation enhancement in exhaust gas in-homogeneity

Impact of cyclic lean–rich aging under DeSO x condition on the lean-gas light-off and hydrogen formation ability of a lean NO x trap (LNT)

Scavenging Phenomena Based Post-oxidation in Exhaust Manifold of a Turbocharged Spark Ignition Engine

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