Development of a Two-Stroke/Four-Stroke Switching Gasoline Engine - The 2/4SIGHT Concept

Osborne, Richard; Stokes, John; Lake, T. H.; Carden, Phil; Mullineux, James; Helle-Lorentzen, R.; Evans, J C; Heikal, Morgan; Zhu, Yicheng; Zhao, Hua; Ma, Tom

doi:10.4271/2005-01-1137

Cited by 48 publications

(32 citation statements)

References 4 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…They offer more control freedom and improved engine performances and emissions. They have been used to operate the 2/4-stroke switchable gasoline engine [14] and air-hybrid engine [15].…”

Section: Introductionmentioning

confidence: 99%

Part-load performance and emissions analysis of SI combustion with EIVC and throttled operation and CAI combustion

Ojapah¹,

Zhang²,

Zhao³

2013

Internal Combustion Engines: Performance, Fuel Economy and Emissions

View full text Add to dashboard Cite

“…They offer more control freedom and improved engine performances and emissions. They have been used to operate the 2/4-stroke switchable gasoline engine [14] and air-hybrid engine [15].…”

Section: Introductionmentioning

confidence: 99%

Part-load performance and emissions analysis of SI combustion with EIVC and throttled operation and CAI combustion

Ojapah¹,

Zhang²,

Zhao³

2013

Internal Combustion Engines: Performance, Fuel Economy and Emissions

View full text Add to dashboard Cite

“…FEV presented and discussed the fuel consumption and emissions of different exhaust gas recirculation methods achieved by an electromechanical valvetrain [13]. In order to extend the load range of CAI combustion for automotive applications, 2-stroke CAI combustion in a 4-valve direct injection gasoline engine was proposed and researched [14]. In order to overcome the high HC and CO emissions and durability issues associated with the conventional crankcase scavenged 2-stroke engines, the 2-stroke poppet valve engine has been developed using the same engine architecture as the current 4-stroke engine, as part of a consortium in developing 2/4 stroke switchable engine technologies through engine downsizing [15].…”

Section: Introductionmentioning

confidence: 99%

Investigation of combustion, performance and emission characteristics of 2-stroke and 4-stroke spark ignition and CAI/HCCI operations in a DI gasoline

Zhang

Zhao

2014

Applied Energy

View full text Add to dashboard Cite

Highlights:1. It was the first time 7 operating modes were achieved on the same engine.2. 7 operating modes covers conventional spark ignition and advanced controlled autoignition in two-stroke and 4-stroke cycles.3. The thermodynamic cycle, combustion process and efficiencies are analysed and presented. ABSTRACTIn order to develop more efficient and cleaner gasoline engines, a number of new engine operating strategies have been proposed and researched on different engines, including the spark ignition (SI) and controlled autoignition (CAI) or HCCI in both 2-stroke and 4-stroke cycles in a poppet valve engine. In this work, a single cylinder direct injection gasoline engine equipped with an electro-hydraulic valve-train system has been commissioned and used to achieve seven different operating modes, including: 4-stroke throttle-controlled SI, 4-stroke intake valve throttled SI, 4-stroke positive valve overlap SI, 4-stroke negative valve overlap CAI, 4-stroke exhaust rebreathing CAI, 2-stroke CAI and 2-stroke SI. Their performance and emission characteristics were analysed and compared at a typical engine calibration operating condition of 1500rpm and 3.6bar IMEP in 4-stroke or 1.8bar IMEP in 2-stroke. Results show that 4-stroke positive valve overlap SI, 4-stroke NVO CAI and exhaust rebreathing CAI modes have better fuel economy and lower NOx emissions than the conventional throttled 4-stroke SI operation. The 2-stroke CAI operation was found to produce higher combustion efficiency and lower ISFC but lower brake efficiency than the 4-s-stroke operations at the same power output due to the supercharger's efficiency. But, at the same IMEP as the 4-stroke operation, the 2-stroke CAI operation results in 29% reduction in BSFC, indicating its potential synergy with highly downsized direct injection gasoline engines for much better fuel economy and performance.

show abstract

“…When a higher output is required the engine switches to the SI mode, though the advantages of the HCCI are lost. Another alternative allowing the engine to operate in the broad range of loads, is a hybrid strategy involving switching between 4-stroke and 2-stroke HCCI modes [6], [12]. This method allows to harvest the efficiency and emission advantages of the HCCI technology without limiting of the load range.…”

Section: Introductionmentioning

confidence: 99%

Smooth switching between 2-stroke and 4-stroke modes of HCCI operation

Subbotin

Park

Kojić

et al. 2009

2009 American Control Conference

View full text Add to dashboard Cite

Switching between 2-stroke and 4-stroke modes of Homogeneous Charge Compression Ignition (HCCI) operation is a promising method for extending load range of HCCI engine. Switching between the two modes introduces disturbances into the system resulting in significant tracking errors. We propose an architecture for control system and a method for calculation of control inputs which minimize the tracking errors during switching. Proposed method produces inputs for engine valve timings which insure smooth transitions between the two HCCI modes under a varying engine load. The method uses techniques from the theory of system identification and the theory of optimal control.

show abstract

Development of a Two-Stroke/Four-Stroke Switching Gasoline Engine - The 2/4SIGHT Concept

Cited by 48 publications

References 4 publications

Part-load performance and emissions analysis of SI combustion with EIVC and throttled operation and CAI combustion

Part-load performance and emissions analysis of SI combustion with EIVC and throttled operation and CAI combustion

Investigation of combustion, performance and emission characteristics of 2-stroke and 4-stroke spark ignition and CAI/HCCI operations in a DI gasoline

Smooth switching between 2-stroke and 4-stroke modes of HCCI operation

Contact Info

Product

Resources

About