Ultra-Lean and High EGR Operation of Dual Mode, Turbulent Jet Ignition (DM-TJI) Engine with Active Pre-chamber Scavenging

Atis, Cyrus; Chowdhury, Sadiyah Sabah; Ayele, Yidnekachew; Stuecken, Tom; Schock, Harold; Voice, Alexander K.

doi:10.4271/2020-01-1117

Cited by 23 publications

(20 citation statements)

References 26 publications

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“…It was noted by Atis et al that the use of their separate air injector was critical for scavenging of the PC before preparing a mixture with a separate fuel injector. 17 Sens et al also made use of a premixed air-fuel mixture but did not report their raw hydrocarbon emissions under EGR dilute operation. 4 However, their reported efficiency gains suggest that excessive THC emissions were not of great concern.…”

Section: Egr Sweep Results (Pc-a Pc-p and Si)mentioning

confidence: 99%

“…Furthermore, the pre-chamber jet momentum does not appear to directly correlate with the main chamber combustion stability. However, it should be noted that the ignition energy requirement is known to scale with dilution, 16,17 implying that the jet strength from the 30% EGR case seemingly results in a large enough flame area to reliably ignite the mixture, while the same is not true for the more dilute 35% case. Overall, the jet momentum clearly does scale with EGR dilution and it is postulated that stronger pre-chamber jets, indicated by a higher jet momentum, could reliably ignite the more dilute charge.…”

Section: Egr Sweep Results (Pc-a Pc-p and Si)mentioning

confidence: 99%

“…In order to alleviate this problem, pre-chamber systems with auxiliary air and fuel injection have been proposed more recently and shown to extend the EGR dilution limit. 4,17…”

Section: Introductionmentioning

confidence: 99%

“…In order to alleviate this problem, pre-chamber systems with auxiliary air and fuel injection have been proposed more recently and shown to extend the EGR dilution limit. 4,17 In the present study, an in-house developed prechamber ignition system is utilized to evaluate the EGR-dilute combustion performance with and without auxiliary air-fuel addition in comparison to conventional spark ignition. Furthermore, the impact of PC control parameters (injection timing, ignition timing, and air-fuel mixture) in the active configuration are characterized.…”

Section: Introductionmentioning

confidence: 99%

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Investigations into EGR dilution tolerance in a pre-chamber ignited GDI engine

Rohwer

Han

Shah

et al. 2022

International Journal of Engine Research

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EGR is a useful means to improve fuel economy in spark-ignited gasoline engines, especially under part-load conditions by means of reducing throttling losses. There is also a significant reduction in NOx emissions due to the reduced peak cylinder temperatures. However, the ability of conventional spark ignition systems to reliably ignite dilute mixtures limits the dilution tolerance due to the onset of combustion instability. In this study, an active pre-chamber system was evaluated at part load condition with various EGR rates using a regular grade full boiling range gasoline. A premixed air-fuel mixture was supplied to the pre-chamber, which assists in scavenging the residual mass fractions to enable reliable ignition of EGR dilute mixtures in the main combustion chamber. A range of pre-chamber injection, air-fuel mixture formulation, and ignition timing strategies were evaluated during the EGR sweeps. In addition, 0-D and 1-D simulations were conducted in GT-Power to assess the thermodynamic state and composition in the pre-chamber, as well as estimate the jet momentum at the various dilution rates. The active pre-chamber extended the EGR dilution limit from 20% for conventional SI to above 30%, with a higher pre-chamber flow rate (more scavenging) resulting in increased combustion stability. A tradeoff between the jet momentum and spark timing was observed when analyzing the GT-Power simulations and the pre-chamber jet momentum was found to decrease with increasing EGR rate. At unstable high EGR operation, no relation could be found between the pre-chamber indicated data and main chamber combustion stability.

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Section: Egr Sweep Results (Pc-a Pc-p and Si)mentioning

confidence: 99%

Section: Egr Sweep Results (Pc-a Pc-p and Si)mentioning

confidence: 99%

“…In order to alleviate this problem, pre-chamber systems with auxiliary air and fuel injection have been proposed more recently and shown to extend the EGR dilution limit. 4,17…”

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Investigations into EGR dilution tolerance in a pre-chamber ignited GDI engine

Rohwer

Han

Shah

et al. 2022

International Journal of Engine Research

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“…This indicates that the torch flame configuration affects the knocking position. Atis et al 34 studied the effect of pre-chamber nozzle orifice diameters, large orifice is beneficial to improve combustion stability and reduce partial combustion.…”

Section: Introductionmentioning

confidence: 99%

Effects of passive pre-chamber jet ignition on combustion and emission at gasoline engine

Duan

Huang

Chen

et al. 2021

Advances in Mechanical Engineering

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Pre-chamber jet ignition is a promising way to improve fuel consumption of gasoline engine. A small volume passive pre-chamber was tested at a 1.5L turbocharged GDI engine. Combustion and emission characteristics of passive pre-chamber at low-speed WOT and part load were studied. Besides, the combustion stability of the passive pre-chamber at idle operation has also been studied. The results show that at 1500 r/min WOT, compared with the traditional spark ignition, the combustion phase of pre-chamber is advanced by 7.1°CA, the effective fuel consumption is reduced by 24 g/kW h, and the maximum pressure rise rate is increased by 0.09 MPa/°CA. The knock tendency can be relieved by pre-chamber ignition. At part load of 2000 r/min, pre-chamber ignition can enhance the combustion process and improve the combustion stability. The fuel consumption of pre-chamber ignition increases slightly at low load, but decreases significantly at high load. Compared with the traditional spark ignition, the NOx emissions of pre-chamber increase significantly, with a maximum increase of about 15%; the HC emissions decrease, and the highest decrease is about 36%. But there is no significant difference in CO emissions between pre-chamber ignition and spark plug ignition. The intake valve opening timing has a significant influence on the pre-chamber combustion stability at idle operation. With the delay of the pre-chamber intake valve opening timing, the CoV is reduced and can be kept within the CoV limit.

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Evaluation of the turbulent hot jet flame characteristics for achieving high thermal efficiency of hybrid engine

Zhao,

Pei,

et al. 2024

Applied Thermal Engineering

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Ultra-Lean and High EGR Operation of Dual Mode, Turbulent Jet Ignition (DM-TJI) Engine with Active Pre-chamber Scavenging

Cited by 23 publications

References 26 publications

Investigations into EGR dilution tolerance in a pre-chamber ignited GDI engine

Investigations into EGR dilution tolerance in a pre-chamber ignited GDI engine

Effects of passive pre-chamber jet ignition on combustion and emission at gasoline engine

Evaluation of the turbulent hot jet flame characteristics for achieving high thermal efficiency of hybrid engine

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