Controlling combustion with negative valve overlap in a gasoline–diesel dual-fuel compression ignition engine

Premixed charge compression ignition technology for diesel engines has been attracting increasing interest in recent years because of its ability to reduce nitrogen oxide emissions. At the same time, homogeneous charge compression ignition technology for gasoline engines also has been expected for h...

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Veröffentlicht in:International journal of engine research 2016-03, Vol.17 (3), p.354-365
Hauptverfasser: Kuzuoka, Kohei, Kondo, Takashi, Kudo, Hirotsugu, Taniguchi, Hiroyoshi, Chishima, Hiroshi, Hashimoto, Kohtaro
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container_end_page 365
container_issue 3
container_start_page 354
container_title International journal of engine research
container_volume 17
creator Kuzuoka, Kohei
Kondo, Takashi
Kudo, Hirotsugu
Taniguchi, Hiroyoshi
Chishima, Hiroshi
Hashimoto, Kohtaro
description Premixed charge compression ignition technology for diesel engines has been attracting increasing interest in recent years because of its ability to reduce nitrogen oxide emissions. At the same time, homogeneous charge compression ignition technology for gasoline engines also has been expected for high thermal efficiency and reduction in nitrogen oxide emissions. However, both methods have common challenges, such as limited part-load operation and ignition timing control. Additionally, under very low load conditions, thermal efficiency decreases due to the difficulty of providing steady combustion. In this study, a dual-fuel method has been applied to control the ignition timing and combustion duration. As a high ignitability fuel, diesel fuel was supplied to the direct injector, and as an inhibitor, gasoline was supplied to the port injector. Under very low load conditions, negative valve overlap and multiple fuel injection were applied. Diesel fuel injected during the negative valve overlap duration oxidised partially in the high-temperature environment with oxygen-contained exhaust gas of the previous cycle. The oxidation reaction of fuel during the main compression stroke was inhibited by the products from these reactions that occurred during negative valve overlap. Thus, it was possible to control the timing of the heat release immediately after top dead centre. As a consequence, high controllability of combustion and high thermal efficiency at low loads were achieved through independent control of the ratio of diesel fuel injected at negative valve overlap and the fractions of the two fuels.
doi_str_mv 10.1177/1468087415580216
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source SAGE Journals
subjects Combustion
Compressing
Diesel engines
Diesel fuels
Emissions
Fuels
Gasoline
Ignition
Oxidation
Temperature
Thermal efficiency
Time measurements
Valves
title Controlling combustion with negative valve overlap in a gasoline–diesel dual-fuel compression ignition engine
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