Effects of Injection Timing on CAI Operation in a 2/4-Stroke Switchable GDI Engine

Zhang, Y.; Zhao, Hua; Ojapah, Mohammed Moore; Cairns, Alasdair

doi:10.4271/2011-01-1773

Cited by 21 publications

(9 citation statements)

References 10 publications

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“…The effect of exhaust gas recirculation (EGR) on the CAI combustion characteristics was examined using exhaust port throttling strategy when the engine was run under WOT condition [46,47]. The effect of utilizing internal EGR by means of the negative valve overlap strategy (rebreathing) has been investigated in a switchable two/four-stroke engine [48][49][50]. The effect of EGR employed in the CAI combustion process was investigated numerically and experimentally [29,32,51].…”

Section: Introductionmentioning

confidence: 99%

Experimental investigation of the influence of internal and external EGR on the combustion characteristics of a controlled auto-ignition two-stroke cycle engine

et al. 2014

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Section: Introductionmentioning

confidence: 99%

Experimental investigation of the influence of internal and external EGR on the combustion characteristics of a controlled auto-ignition two-stroke cycle engine

et al. 2014

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“…It is well proven that NOx formation at combustion temperatures beyond approximately 2100 °K will be accelerated significantly [1,19,20,29]. Accordingly, it can be inferred that the formation of NOx (variation of NOx) is directly proportional to the variation of T max [11,22,23,28,30]. Thus the magnitude of T max regulates the amount of NOx emission.…”

Section: Resultsmentioning

confidence: 99%

“…This combustion process can reduce emissions of uHCs and allow stable engine operation by lower cyclic variation [11,13]. In order to achieve auto-ignition at the end of the compression stroke, the temperature of the charge at the beginning of the compression (T epc ) stroke should be sufficiently high [25][26][27][28][29]. Deployment of EGR results in a higher gas temperature throughout the compression process, which in turn speeds up the chemical reactions and eventually leads to the start of auto-ignition combustion of the homogeneously mixed fuel and air mixture [10,11,29,30].…”

Section: Introductionmentioning

confidence: 99%

Influence of Hot Burned Gas Utilization on the Exhaust Emission Characteristics of a Controlled Auto-Ignition Two-Stroke Cycle Engine

Andwari

Aziz²,

Said

et al. 2015

Int. J. Automot. Mech. Eng.

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A controlled auto-ignition (CAI) two-stroke cycle engine suggests an exceptional aspect and promising future for internal combustion engines (ICEs), such as a higher power-toweight ratio, higher combustion efficiency and lower exhaust gas emissions. Conventional two-stroke cycle engines emit higher exhaust gas emissions and offer lower fuel saving economy. Most of these drawbacks can be addressed if CAI combustion is associated with a two-stroke cycle engine. An experimental investigation is carried out based on a single-cylinder CAI two-stroke cycle engine using Internal and External Exhaust Gas Recirculation (In-EGR and Ex-EGR) and fuels with different octane numbers to investigate the exhaust emissions characteristics. The experimental results indicate a remarkable improvement in the engine's exhaust gas emissions. The concentration of uHC and CO emissions decreased with application of In/Ex-EGR. However, NOx emission increased with the use of In-EGR.

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“…In-cylinder gas temperature at exhaust port closure moment (Tepc) can be increased sufficiently with the employment of exhaust hot burned gases; such a way is known as exhaust gas recirculation (EGR) technique [23][24][25][26][27][28][29]. The amount of Tepc must be high to achieve a complete combustion at the end of the compression stroke by means of spark plug ignition [30][31][32][33][34][35][36]. Basically, the major effects of EGR utilisation can be defined as: Charge-Heating Effect, Dilution Effect, Heat Capacity Effect and Chemical Effect [37][38][39][40][41][42][43].…”

Section: Introductionmentioning

confidence: 99%

Effect of internal and external EGR on cyclic variability and emissions of a spark ignition two-stroke cycle gasoline engine

Andwari¹,

Vehicle²,

Aziz³

et al. 2017

J. MECH. ENG. SCI.

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Conventional two-stroke cycle engine suffers from typical drawbacks including lower combustion efficiency and excessive emissions of uHC and CO which are largely due to low in-cylinder average charge temperature at low load and speed regions of engine operating conditions. Utilising the hot burned Exhaust Gas Recirculation (EGR) technique can boost the in-cylinder average charge temperature of the engine. The influence of hot burned gases applied by means of both Internal EGR and External EGR strategies on the combustion stability and exhaust gas emission of a single-cylinder twostroke cycle engine running at low-load and mid-load of operating conditions was investigated experimentally along with simulation works using 1-D engine simulation code. The results indicated that both In-EGR and Ex-EGR improved the combustion stability (lower misfire cycle) and decreased the concentrations of uHC and CO emissions, specifically at low speed region; however, NOx concentration was increased. At Internal EGR setting of 30%, the Coefficient of Variation for maximum in-cylinder pressure (COVPmax) reached the minimum by 5.64 while when External EGR percentage was 25%, COVPmax approached about 6.67 at the mid-speed (2000 rpm) of engine operating condition.

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Effects of Injection Timing on CAI Operation in a 2/4-Stroke Switchable GDI Engine

Cited by 21 publications

References 10 publications

Experimental investigation of the influence of internal and external EGR on the combustion characteristics of a controlled auto-ignition two-stroke cycle engine

Experimental investigation of the influence of internal and external EGR on the combustion characteristics of a controlled auto-ignition two-stroke cycle engine

Influence of Hot Burned Gas Utilization on the Exhaust Emission Characteristics of a Controlled Auto-Ignition Two-Stroke Cycle Engine

Effect of internal and external EGR on cyclic variability and emissions of a spark ignition two-stroke cycle gasoline engine

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