Investigation on the Highly Precise Air Fuel Ratio Adaptive Control in Transient States under Changes in the Intake Valve Opening Timing

Takiyama, Takeshi

doi:10.4271/2014-01-1162

Cited by 3 publications

(2 citation statements)

References 6 publications

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“…In response to the requirements for increasing the fuel efficiency and reducing the harmful exhaust gas generation in gasoline engines, the previous studies have observed some of the regulatory requirements by adjusting the air-to-fuel ratio (A/F), the timing for ignition, and other performance factors of engine [1][2][3][4][5][6][7][8][9]. However, one factor is not considered as part of improving the variation of pressure in the combustion stroke per cycle.…”

Section: Introductionmentioning

confidence: 99%

Experimental Study of Combustion Fluctuation Reduction Using In-Cylinder Pressure Estimation in Gasoline Engine

Ichiyanagi

Anggono

Dziemińska

et al. 2018

International Journal of Industrial Research and Applied Engineering

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Gasoline engines needs to reduce its negative emission waste and raise its thermal efficiency. Previous studies have shown an improvement of engines by regulating the ignition timing and retaining the engine at certain air-to-fuel ratio. Additional development of the thermal efficiency is anticipated by reducing the oscillation of pressure due to combustion (referred to as combustion fluctuation) during each cycle. Reducing the combustion fluctuations promotes the generation of a stable combustion field and improves fuel consumption. Since the combustion fluctuations are significantly affected by the in-cylinder pressure at compression top dead center (referred to as TDC pressure), the present study proposes a method to estimate the TDC pressure in the next cycle. The estimation was conducted by measuring the in-cylinder pressure at exhaust valve opening in the given cycle. This study also developed the method to reduce the combustion fluctuations by using the TDC pressure estimation and controlling the ignition timing. In our experiments, it was found that the developed methods reduced the fluctuations of the indicated mean effective pressure (IMEP), the maximum in-cylinder pressure, and the TDC pressure by 62.1%, 51.2%, and 38.5%, respectively.

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Section: Introductionmentioning

confidence: 99%

Experimental Study of Combustion Fluctuation Reduction Using In-Cylinder Pressure Estimation in Gasoline Engine

Ichiyanagi

Anggono

Dziemińska

et al. 2018

International Journal of Industrial Research and Applied Engineering

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show abstract

“…General speaking, the evaporation and adhesion characteristics of fuel-film changes with pressure as in [5]. In transition condition, changes of intake pressure causes fuel-film to change.…”

Section: Introductionmentioning

confidence: 99%

Transient Fuel-Film Compensation Strategy of PFI Gasoline Engine Based on Combined Film Model

Huang

Chen

2016

MATEC Web Conf.

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Abstract. For port-injected gasoline engines, an innovative strategy of transient fuel-film compensation is proposed to eliminate the impact of fuel-film dynamic effects and improve the transient air fuel ratio control accuracy. A combined fuel-film model composes of a long-term fuel-film and a short-term fuel-film was established. A transient fuel-film compensator model was analyzed in detail. The respective term of the fuel-film model is calculated by a share factor. The decay coefficients control the fuel compensation quantity and the active time. The validity of above models were verified though engine bench tests. The results show that this new strategy can effectively suppress the λ offset during engine transient condition, the transient lambda deviation is less than 5% and stabilized within 1 second.

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PI and Adaptive Model Matching Control System that Satisfies the Setting Settling Time application to engine speed control

et al. 2018

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Investigation on the Highly Precise Air Fuel Ratio Adaptive Control in Transient States under Changes in the Intake Valve Opening Timing

Cited by 3 publications

References 6 publications

Experimental Study of Combustion Fluctuation Reduction Using In-Cylinder Pressure Estimation in Gasoline Engine

Experimental Study of Combustion Fluctuation Reduction Using In-Cylinder Pressure Estimation in Gasoline Engine

Transient Fuel-Film Compensation Strategy of PFI Gasoline Engine Based on Combined Film Model

PI and Adaptive Model Matching Control System that Satisfies the Setting Settling Time application to engine speed control

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