Measurement of Local Mixture Strength at Spark Gap of S. I. Engines

Matsui, Kazuma; Tanaka, Taro; Ohigashi, Shunichi

doi:10.4271/790483

Cited by 21 publications

(3 citation statements)

References 3 publications

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“…Some methods have been proposed to measure the fuel concentration in engines. Gas sampling methods have often been used in commercial engines, but successive data cannot be obtained [13]. Although fast flame ionization detector (FID) systems have been developed and are available, which allow instantaneous hydrocarbon concentration measurements inside the cylinder, the time-lag problem due to the sampling tube is quite serious [4,14].…”

Section: Introductionmentioning

confidence: 99%

In situmeasurement of hydrocarbon fuel concentration near a spark plug in an engine cylinder using the 3.392 m infrared laser absorption method: application to an actual engine

Tomita

Kawahara

Nishiyama

et al. 2003

Meas. Sci. Technol.

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An infrared absorption method with a 3.392 µm He–Ne laser was used to determine the hydrocarbon fuel concentration near the spark plug in a spark-ignition engine. Iso-octane was used for the fuel. The pressure and temperature dependence of the molar absorption coefficient was clarified. The molar absorption coefficients of a multi-component fuel such as gasoline were estimated by using the coefficient of each component and considering the mass balance. A sensor was developed and installed in a spark plug, which was substituted in place of an ordinary spark plug in a spark-ignition engine. Light can pass from the sensor through the engine cylinder to measure the fuel concentration. The effects of liquid droplets inside the engine cylinder, mechanical vibrations and other gases such as H2O and CO2 on the measurement accuracy were considered. Four main conclusions were drawn from this study. First, the pressure and temperature effects on the molar absorption coefficient of liquid fuel vapour were determined independently in advance using a constant-volume vessel. The pressure and temperature dependence of the molar absorption coefficient was determined under engine firing conditions. Second, the molar absorption coefficients of a multi-component hydrocarbon fuel such as gasoline were estimated by considering the molar fraction of each component. Third, in situ measurements of the hydrocarbon fuel concentration in an actual engine were obtained using the spark plug sensor and the molar absorption coefficient of iso-octane. The concentration near the spark plug just before ignition was almost in agreement with the mean value that was obtained from the measurement of the flow rate made with a burette, which represented the mean value averaged over many cycles. And fourth, no liquid droplets were observed at near-idling conditions. The effects of other gases, such as CO, CO2 and H2O, can be neglected.

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Section: Introductionmentioning

confidence: 99%

In situmeasurement of hydrocarbon fuel concentration near a spark plug in an engine cylinder using the 3.392 m infrared laser absorption method: application to an actual engine

Tomita

Kawahara

Nishiyama

et al. 2003

Meas. Sci. Technol.

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“…2, is proposed to correct the fault in the airflow informa-Fig. 1 Variation in the air-fuel (AF) ratio delivered to a single cylinder in 30 consecutive cycles [2] tion delivered to the electronic control unit (ECU) of the engine system. The ECU processes all the inputs from the various sensors on board and uses that information to determine the optimum amount of fuel to be injected, which it controls by varying the amount of time that the fuel injectors are open.…”

Section: Airflow Correction Systemmentioning

confidence: 99%

“…The standard deviation of the air-fuel ratio within a cylinder is typically of the order of 2-6 per cent of the average. Figure 1 shows a typical variation in the air-fuel ratio of a single cylinder in 30 consecutive cycles [2]. 7.…”

Section: Introductionmentioning

confidence: 99%

Fault correction of an airflow signal in a gasoline engine system using a neural fuzzy scheme and genetic algorithm

Chen

2009

Proceedings of the Institution of Mechanical Engineers, Part D:

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This study presents an airflow correction system for correcting the fault of an airflow signal of a gasoline engine. The correction system consists of a fuzzy-model-based airflow estimation system and an airflow-monitoring system. The airflow estimation system estimates the normal airflow based on fuzzy neural networks and trained using the steepest-descent method and back-propagation algorithm. The airflow-monitoring system corrects the fault airflow signal according to the correction law. In order to raise the training performance, a genetic algorithm is used to search the learning rates and initial consequent gains of the fuzzy neural networks. The estimated results indicate that using a genetic algorithm certainly improves the performance of normal airflow estimation. The corrected results indicate that the airflow correction system can provide a feasible means of carrying out airflow fault correction in gasoline engine systems.

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Numerical Investigation on the Effect of EGR in a Premixed Natural Gas SI Engine

Sahoo

Tripathy

Srivastava

2020

Proceedings of the 7th International Conference on Advances in Energy Research

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Measurement of Local Mixture Strength at Spark Gap of S. I. Engines

Cited by 21 publications

References 3 publications

In situmeasurement of hydrocarbon fuel concentration near a spark plug in an engine cylinder using the 3.392 m infrared laser absorption method: application to an actual engine

In situmeasurement of hydrocarbon fuel concentration near a spark plug in an engine cylinder using the 3.392 m infrared laser absorption method: application to an actual engine

Fault correction of an airflow signal in a gasoline engine system using a neural fuzzy scheme and genetic algorithm

Numerical Investigation on the Effect of EGR in a Premixed Natural Gas SI Engine

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