Lean Boost and External Exhaust Gas Recirculation for High Load Controlled Auto-Ignition

2005 ◽  
Author(s):  
Alasdair Cairns ◽  
Hugh Blaxill
Keyword(s):  
Exhaust Gas Recirculation ◽  
High Load ◽  
Exhaust Gas ◽  
Auto Ignition ◽  
Gas Recirculation

A Converted Two-Stroke Cycle Engine for Compression Ignition Combustion

2014 ◽  
Vol 663 ◽  
pp. 331-335 ◽  
Author(s):  
Amin Mahmoudzadeh Andwari ◽  
Azhar Abdul Aziz ◽  
Mohd Farid Muhamad Said ◽  
Zulkarnain Abdul Latiff
Keyword(s):  
Internal Combustion Engines ◽  
Exhaust Gas Recirculation ◽  
Exhaust Emissions ◽  
Exhaust Gas ◽  
Cyclic Variation ◽  
Cyclic Variability ◽  
Auto Ignition ◽  
Compression Ignition Combustion ◽  
Gas Recirculation ◽  
Stroke Cycle

A new kind of alternative combustion concept that has attracted attention intensively in recent years is called controlled auto-ignition (CAI) combustion. CAI combustion has been proposed and partially implemented with the aim of both improving the thermal efficiency of internal combustion engines, achieving cleaner exhaust emissions and lower cyclic variation. An experimental study is conducted through a CAI two-stroke cycle engine in order to investigate the influence of internal exhaust gas recirculation (In-EGR) and external exhaust gas recirculation (Ex-EGR) variation in relation to combustion cyclic variability and exhaust emissions characteristics. Results implied that cyclic variation of both combustion-related and pressure-related parameter is substantially improved. Furthermore remarkable decreased exhaust emissions, unburned hydrocarbon (uHC), carbon monoxide (CO) and nitric dioxide (NOX), was observed.

scholarly journals Controlled End Gas Auto Ignition With Exhaust Gas Recirculation on a Stoichiometric, Spark Ignited, Natural Gas Engine

2020 ◽  
Author(s):  
Scott Bayliff ◽  
Bret Windom ◽  
Anthony Marchese ◽  
Greg Hampson ◽  
Jeffrey Carlson ◽  
...  
Keyword(s):  
Natural Gas ◽  
Compression Ratio ◽  
High Efficiency ◽  
Exhaust Gas Recirculation ◽  
Peak Performance ◽  
Stable Operation ◽  
Exhaust Gas ◽  
Ignition Timing ◽  
Auto Ignition ◽  
Gas Recirculation

Abstract The goal of this study is to address fundamental limitations to achieving diesel-like efficiencies in heavy duty on-highway natural gas (NG) engines. Engine knock and misfire are barriers to pathways leading to higher efficiency engines. This study explores enabling technologies for development of high efficiency stoichiometric, spark ignited, natural gas engines. These include design strategies for fast and stable combustion and higher dilution tolerance. Additionally, advanced control methodologies are implemented to maintain stable operation between knock and misfire limits. To implement controlled end-gas autoignition (C-EGAI) strategies a Combustion Intensity Metric (CIM) is used for ignition control with the use of a Woodward large engine control module (LECM). Tests were conducted using a single cylinder, variable compression ratio, cooperative fuel research (CFR) engine with baseline conditions of 900 RPM, engine load of 800 kPa indicated mean effective pressure (IMEP), and stoichiometric air/fuel ratio. Exhaust gas recirculation (EGR) tests were performed using a custom EGR system that simulates a high pressure EGR loop and can provide a range of EGR rates from 0 to 40%. The experimental measurements included the variance of EGR rate, compression ratio, engine speed, IMEP, and CIM. These five variables were optimized through a Modified BoxBenken design Surface Response Method (RSM), with brake efficiency as the merit function. A positive linear correlation between CIM and f-EGAI was identified. Consequently, CIM was used as the feedback control parameter for C-EGAI. As such, implementation of C-EGAI effectively allowed for the utilization of high EGR rates and CRs, controlling combustion between a narrower gap between knock and lean limits. The change from fixed to parametric ignition timing with CIM targeted select values of f-EGAI with an average coefficient of variance (COV) of peak pressure of 5.4. The RSM efficiency optimization concluded with operational conditions of 1080 RPM, 1150 kPa IMEP, 10.55:1 compression ratio, and 17.8% EGR rate with a brake efficiency of 21.3%. At this optimized point of peak performance, a f-EGAI for C-EGAI was observed at 34.1% heat release due to auto ignition, a knock onset crank angle value of 10.3° aTDC and ignition timing of −24.7° aTDC. This work has demonstrated that combustion at a fixed f-EGAI can be maintained through advanced ignition control of CIM without experiencing heavy knocking events.

Effects of internal exhaust gas recirculation on controlled auto-ignition in a methane engine combustion

Fuel ◽  
2009 ◽  
Vol 88 (6) ◽  
pp. 1042-1048 ◽  
Author(s):  
Gyubaek Cho ◽  
Gunfeel Moon ◽  
Dongsoo Jeong ◽  
Choongsik Bae
Keyword(s):  
Exhaust Gas Recirculation ◽  
Exhaust Gas ◽  
Auto Ignition ◽  
Engine Combustion ◽  
Gas Recirculation

Effects of exhaust gas recirculation in homogeneous charge compression ignition engines

2000 ◽  
Vol 1 (3) ◽  
pp. 269-279 ◽  
Author(s):  
M Nakano ◽  
Y Mandokoro ◽  
S Kubo ◽  
S Yamazaki
Keyword(s):  
Homogeneous Charge Compression Ignition ◽  
Exhaust Gas Recirculation ◽  
Exhaust Gas ◽  
Compression Ignition ◽  
Ignition Timing ◽  
Auto Ignition ◽  
Significant Difference ◽  
Hcci Engines ◽  
Gas Recirculation ◽  
Homogeneous Charge

Ignition control is an important issue in homogeneous charge compression ignition (HCCI) engines, which have the advantages of low NOx emission and high thermal efficiency. In this study, the effect of the exhaust gas recirculation (EGR) on the ignition control of HCCI engines is discussed using an engine cycle simulation in which a homogeneous mixture is assumed. Auto-ignition of 65 per cent iso-octane + 25 per cent toluene + 10 per cent n-heptane, which is used as a fuel to evaluate the characteristics of a gasoline-like fuel, is represented by a detailed reaction model. The dilution by EGR delays the ignition timing when the charged gas temperature is not changed by EGR. The temperature rise of the charged gas promotes auto-ignition. Based on these characteristics, it was suggested that the ignition timing could be controlled by EGR with temperature control, when the amount of fuel supply is constant. This control method can also be applied to control of the air-fuel ratio (A/F) in the cylinder while maintaining the optimum ignition timing. In spite of the difference in the A/F and the EGR ratios, no significant difference was found in the pressure rise rate at combustion and the NOx emission when the ignition timing was the same.

Potential of High Load Extension for Gasoline HCCI Engine Using Boosting and Exhaust Gas Recirculation

2009 ◽  
Vol 23 (5) ◽  
pp. 2444-2452 ◽  
Author(s):  
Fan Xu ◽  
Zhi Wang ◽  
Dongbo Yang ◽  
Jianxin Wang
Keyword(s):  
Exhaust Gas Recirculation ◽  
High Load ◽  
Exhaust Gas ◽  
Hcci Engine ◽  
Gas Recirculation

scholarly journals Controlled End Gas Auto Ignition With Exhaust Gas Recirculation on a Stoichiometric, Spark Ignited, Natural Gas Engine

2021 ◽  
Author(s):  
Scott Bayliff ◽  
Bret Windom ◽  
Anthony Marchese ◽  
Greg Hampson ◽  
Domenico Chiera ◽  
...  
Keyword(s):  
Natural Gas ◽  
Exhaust Gas Recirculation ◽  
Exhaust Gas ◽  
Gas Engine ◽  
Natural Gas Engine ◽  
Auto Ignition ◽  
Gas Recirculation
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