A methodology for regulating fuel stratification and improving fuel economy of GCI mode via double main-injection strategy

Zhang, Yaoyuan; Mi, Shijie; Zhao, Wenbin; He, Zhuoyao; Lü, Xingcai

doi:10.1007/s11708-022-0859-z

Cited by 4 publications

(1 citation statement)

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“…In our prior investigation, two direct-injection injectors in a GCI engine were used to compensate for the lack of injection pressure, confirming that dual direct-injection can achieve better thermal efficiency than single direct-injection at high loads. 29,30 However, the existing studies primarily focused on experiments where both injectors injected simultaneously, leaving a significant research gap regarding the impact of injection parameters and fuel octane number on the dual direct-injection mode. This mode holds considerable potential for optimization, especially with newly added injectors where both systems can be independently controlled.…”

Section: Introductionmentioning

confidence: 99%

Investigation of injection parameters coupled with fuel reactivity on combustion and emissions in dual direct-injection GCI engine

Wu,

Mi,

Qian

et al. 2024

International Journal of Engine Research

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Fuel injection parameters and fuel reactivity significantly affect engine performance, combustion, and emissions. The dual direct-injection strategy could compensate for the insufficient heat release rate to improve the gasoline compression ignition (GCI) mode with medium injection pressure for high loads. This research aims to couple injection parameters and fuel reactivity to optimize the combustion, emissions, and engine performance of the dual direct-injection GCI mode at high loads. The effect of research octane number (RON) of gasoline, injection timing, and injection pressure of dual injection system on combustion and emissions was investigated. Results show that the optimized dual direct-injection GCI mode can simultaneously achieve high thermal efficiency, low emissions, and low maximum pressure rise rate (MPRR) at high loads with the maximum indicated mean effective pressure (IMEP) of about 16 bar with indicated thermal efficiency (ITE) of 48.5%. Delaying the injection timing of injector-1 reduced the peak pressure (Ppeak), MPRR, and NOx emissions. Ppeak, CO, NOx, and indicated specific fuel consumption (ISFC) decreased compared to the dual-injector simultaneous injection case when the injection timing of injector-2 was retarded to between 5 and 10°CA ATDC. Increasing the injection pressure of injector-2 reduced CO, THC, ISFC, and particulate emissions. Lower RON gasoline obtains higher ITE while higher RON gasoline obtains lower particulate emissions.

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Section: Introductionmentioning

confidence: 99%