A Study of Gasoline-fuelled HCCI Engine Equipped with an Electromagnetic Valve Train

Urata, Yasuhiro; Awasaka, Moriyoshi; Takanashi, Junichi; Kakinuma, Takashi; Hakozaki, Takazou; Umemoto, Atsushi

doi:10.4271/2004-01-1898

Cited by 69 publications

(40 citation statements)

References 12 publications

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“…One of the technologies which has been receiving attention is Homogeneous Charge Compression Ignition (HCCI), which combines features of the spark ignition and compression ignition (CI) processes. The basic principle of HCCI is, either in gasoline [1,2,3,4] or diesel [5,6,7,8] engines, the air and fuel are premixed prior to ignition and then ignited by the compression from the piston motion. The ignition is provided in multiple points and therefore the charge gives a parallel energy release.…”

Section: Introductionmentioning

confidence: 99%

Extending the High Load Operating Limit of a Naturally-Aspirated Gasoline HCCI Combustion Engine

Yun¹,

Wermuth²,

Najt³

2010

SAE Int. J. Engines

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Homogenous Charge Compression Ignition (HCCI) combustion offers efficiency improvements compared to conventional gasoline engines. However, due to the nature of HCCI, traditional HCCI combustion can be realized only in a limited operating range. The HCCI operation at high load is limited by excessive combustion noise.In order to maximize the fuel economy benefits of HCCI its operating range needs to be extended to higher loads. In particular, one immediate benefit of an increased load range on the NEDC driving cycle is the avoidance of transitions between SI operation and HCCI operation.In this research a detailed investigation of the fundamental reasons for high combustion noise was performed. Sparkassisted HCCI combustion was found to be a key factor to reduce combustion noise at high load condition. Injection timing for charge cooling, spark timing for the onset of combustion through flame propagation, smaller NVO and higher EGR are the enablers to achieve the appropriate sparkassisted HCCI combustion at high load operation. The high load limit was successfully extended while maintaining good efficiency and complying with emissions regulations.The effect of double injection strategy was also investigated. It is found that even though slight improvement in the tradeoff between combustion noise and combustion stability can be achieved through double injection strategy, fuel consumption is deteriorated due to incomplete combustion.

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Section: Introductionmentioning

confidence: 99%

Extending the High Load Operating Limit of a Naturally-Aspirated Gasoline HCCI Combustion Engine

Yun¹,

Wermuth²,

Najt³

2010

SAE Int. J. Engines

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“…2 This limit is dependent on the maximum value of dP/du; that is, the knock intensity allowable for normal engine operation and NO x emissions, both of which are governed by combustion temperature and steep heat-release rates.…”

Section: The Bdsc Systemmentioning

confidence: 99%

“…Reprinted with permission from SAE paper 2001-04-1898 Ó 2004 SAE International. 2 and temperature [13][14][15][16][17][18][19][20] have been widely examined. Direct fuel injection has been applied to provide in-cylinder fuel stratification.…”

Section: Introductionmentioning

confidence: 99%

Extension of an operating load range of a four-cylinder gasoline homogeneous charge compression ignition engine via a blowdown supercharge system, aiming at in-cylinder thermal stratification

Kuboyama

Moriyoshi

Hatamura³

et al. 2012

International Journal of Engine Research

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Extension of an operating load range of a four-cylinder gasoline homogeneous charge compression ignition engine via a blowdown supercharge system, aiming at in-cylinder thermal stratification Abstract In order to extend the operational range with a gasoline fueled multi-cylinder homogeneous charge compression ignition engine, a blowdown supercharge system and an exhaust gas recirculation guide was developed. The concept was to provide a large amount of diluted mixture and a strong in-cylinder thermal stratification for decreasing nitrogen oxide emissions and pressure rise rate during high-load homogeneous charge compression ignition operation. Secondary air injection was also proposed to reduce a cylinder-to-cylinder variation in ignition timing, which is one of the limiting factors of multi-cylinder homogeneous charge compression ignition operation. In advance of experimental works, the blowdown supercharge system and the exhaust gas recirculation guide were proved to be effective to reduce pressure rise rate for high-load operation using three-dimensional in-cylinder flow simulations and zero-dimensional multi-zone simulations with detailed chemical kinetics. Based on the simulation results, experiments were conducted using a slightly modified production four-cylinder gasoline engine. At first, the effects of the proposed techniques were experimentally investigated by focusing on one cylinder out of four. Then, a four-cylinder homogeneous charge compression ignition operation test using the new techniques was carried out. The one-cylinder measurements revealed that the blowdown supercharge system with an exhaust gas recirculation guide is capable of extending the homogeneous charge compression ignition operating range up to a net indicated mean effective pressure of 590 kPa for naturally aspirated conditions. In addition, secondary air injection was experimentally demonstrated as a technique for reducing a cylinder-to-cylinder variation in ignition timing. Reducing the cylinder-to-cylinder variation in ignition timing, four-cylinder homogeneous charge compression ignition operation with a net indicated mean effective pressure of 570 kPa was successfully achieved with the blowdown supercharge system and the exhaust gas recirculation guide.

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“…With sufficiently high intake manifold pressures, loads up to 16 bar indicated mean effective pressure (IMEP) were achieved with intake air heating in a diesel type engine fuelled with natural gas (Christensen and Johansson, 2000). As such, it appears that increasing the dilution amounts is instrumental to increasing the useable load range for HCCI combustion as other methods such as stratification show increased NOx emissions and high cycle-to-cycle variation (Urata et al, 2004).…”

Section: Introductionmentioning

confidence: 98%

An Experimental Study of Bioethanol Hcci

Yap

Megaritis

Wyszyński

2005

Combustion Science and Technology

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Bioethanol has been successfully used in conventional spark ignition (SI) internal combustion engines. Homogeneous charge compression ignition (HCCI) combustion, a novel combustion method, has shown the potential for low nitric oxides (NOx) emissions with no particulate matter formation. This paper explores two different approaches to achieve HCCI with bioethanol; namely, trapping of internal residual gas and intake temperature heating with a high compression ratio. For naturally aspirated HCCI operation with residual gas trapping on a spark ignition engine, although the NOx emissions were low, the load range was unacceptably small. When inlet manifold pressurisation was employed, a substantial increase in the upper load boundary could be achieved without any substantial increase in NOx emissions.With forced induction, the feasibility of using boost control as the main method of load control for higher engine loads during HCCI operation has been explored with possible methods of utilizing boost control. One possible strategy is a map based strategy where fuelling rates are correlated versus boost pressure and trapped residual amounts. A proof of concept using this strategy showed that transient operation from a low load to a much higher load, using boost control might be possible without engine misfire.

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A Study of Gasoline-fuelled HCCI Engine Equipped with an Electromagnetic Valve Train

Cited by 69 publications

References 12 publications

Extending the High Load Operating Limit of a Naturally-Aspirated Gasoline HCCI Combustion Engine

Extending the High Load Operating Limit of a Naturally-Aspirated Gasoline HCCI Combustion Engine

Extension of an operating load range of a four-cylinder gasoline homogeneous charge compression ignition engine via a blowdown supercharge system, aiming at in-cylinder thermal stratification

An Experimental Study of Bioethanol Hcci

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