Crankshaft Positioning Utilizing Compression Force and Fast Starting with Combustion Assist for Indirect Injection Engine

Kataoka, K.; Tsuji, Kimitoshi

doi:10.4271/2005-01-1166

Cited by 13 publications

(4 citation statements)

References 4 publications

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“…However, estimates by Bassett [23] suggested that this was a minimal effect. Furthermore if a smart idle stop system were implemented, as described in [24], which enables the engine cranking to assisted by igniting the cylinder contents, the electrical demand of restarting would be further reduced.…”

Section: Assessment Of Stop-at-idle With Mahle Downsize Enginementioning

confidence: 99%

Challenges for Increased Efficiency through Gasoline Engine Downsizing

Fraser¹,

Blaxill²,

Lumsden³

et al. 2009

SAE Int. J. Engines

177

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In order to achieve the required future CO 2 reduction targets significant further development of both gasoline and diesel engines is required. One of the main methods to achieve this with the gasoline engine in the short to medium term is through the application of engine downsizing, which has resulted in numerous downsized engines already being brought to production. It is, however, considered that there is still significant further CO 2 reduction potential through continued development of this technology. This paper considers the future development of gasoline engine downsizing in the short to medium term and the various technologies that can be applied to further increase the efficiency of operation. As such this paper covers, among other areas, fundamental engine layout and design, alternative boosting systems, methods of increasing part load efficiency and vehicle modelling, and uses analysis tools and engine test results to show the benefits achievable.

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Section: Assessment Of Stop-at-idle With Mahle Downsize Enginementioning

confidence: 99%

Challenges for Increased Efficiency through Gasoline Engine Downsizing

Fraser¹,

Blaxill²,

Lumsden³

et al. 2009

SAE Int. J. Engines

177

View full text Add to dashboard Cite

show abstract

“…The initial crank angle is a significant controllable variable during engine starts. 17 Therefore, effects of the initial crank angle on the torque fluctuations and vibrations are investigated. Figure 14(a) shows engine torque curves in angle domain at different initial crank angles.…”

Section: Effect Of the Initial Crank Positionmentioning

confidence: 99%

Multibody dynamics analysis for the coupled vibrations of a power split hybrid electric vehicle during the engine start transition

Liu

Zhang

2016

Proceedings of the Institution of Mechanical Engineers, Part K:

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Minimizing working time of the internal combustion engine is an important method for hybrid electric vehicles to save energy and reduce emissions. However, vibrations caused by frequent engine starts and stops deteriorate driveability and ride comfort. Especially in power split hybrid vehicles, there is no kinematically decoupled device between the engine and transmission, so that vibrations transfer from the powertrain to the car body through not only engine mounts but also the driveline system. Hardware test results show that the longitudinal vibration of seat track is the most severe with a maximum peak-to-peak acceleration of 1.8 m/s 2. In this study, dynamic models of the driveline system and the powertrain mounting system are respectively established in detail. The natural characteristic analyses of the two dynamic models reveal that engine order vibrations can stimulate a series of low-frequency resonances during the engine starts, which is finally embodied in the car body vibrations. Then, two dynamic models are coupled together to analyze the transient dynamic characteristics associated with engine starts. It is evident by simulations that the longitudinal vibration of car body is mainly transferred by the driveline, whereas the vertical vibration of car body is mainly transferred by the powertrain mounting system. Besides, the initial crankshaft position of the gasoline engine has an obvious effect on the engine order vibration, and further results in different transient responses of the full vehicle system.

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“…An "invalid idle stop," which means that the fuel saved by idle stop can not compensate the fuel economy deterioration by engine restart, should be avoided (Matsuura et al, 2004). Second, special methods should be adopted to guarantee quick engine starts so that good drivability can be attained (Kataoka et al, 2005). It is well known that start/stop operations cause additional vibration and noise (Kuang et al, 2006), so increased effort may be necessary to improve passenger comfort.…”

Section: Introductionmentioning

confidence: 99%

Transient characteristics of emissions during engine start/stop operation employing a conventional gasoline engine for HEV application

Dong

2008

Int.J Automot. Technol.

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In this paper, we investigate the transient characteristics of combustion and emissions during engine start/stop operations in hybrid electric vehicle (HEV) applications. Hydrocarbon (HC) emissions during the initial 2 nd~9th cycles are found to be significantly greater when the engine is quickly started under the original engine calibration mode. Lower intake manifold absolute pressure (MAP) was also found to cause larger residual gas dilution and poor combustion, resulting in a higher HC concentration when the cranking speed was increased. The post-catalyst HC concentration was found in the way of initially decrease and then to increase again as the cranking speed was increased. A lowest concentration value was achieved at a cranking speed of 1000 r/min. Engine shut-down by fuel cut-off was shown to produce lower emissions than shut-down by ignition cut-off as one can avoid misfire of the last fuel injection cycle. The fuel deposited during the stop process seems to impact engine restart enrichment mostly during the initial 0.7 s for this engine, whose performance is dominated by the MAP transition characteristic and the time coefficient for fuel vaporization in this time period

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Crankshaft Positioning Utilizing Compression Force and Fast Starting with Combustion Assist for Indirect Injection Engine

Cited by 13 publications

References 4 publications

Challenges for Increased Efficiency through Gasoline Engine Downsizing

Challenges for Increased Efficiency through Gasoline Engine Downsizing

Multibody dynamics analysis for the coupled vibrations of a power split hybrid electric vehicle during the engine start transition

Transient characteristics of emissions during engine start/stop operation employing a conventional gasoline engine for HEV application

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