Engine fuel property estimation apparatus

In the fuel property estimation apparatus of the invention, when fuel of an engine is cut, an upper-limit rotation speed NEmax is set based on vehicle speed SPD. When the engine rotation speed NE becomes equal to or less than the upper-limit rotation speed NEmax (YES in S102), the fuel injection for...

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Bibliographic Details
Main Authors ITO AKITOMO, IZUMI HAYATA, TSUCHIYAMA MAKIO
Format Patent
LanguageChinese
English
Published 17.12.2014
Subjects
BLASTING
COMBUSTION ENGINES
CONTROLLING COMBUSTION ENGINES
HEATING
HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
LIGHTING
MECHANICAL ENGINEERING
WEAPONS
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Summary:In the fuel property estimation apparatus of the invention, when fuel of an engine is cut, an upper-limit rotation speed NEmax is set based on vehicle speed SPD. When the engine rotation speed NE becomes equal to or less than the upper-limit rotation speed NEmax (YES in S102), the fuel injection for estimation of the cetane number of the fuel that is an index value the ignition quality of the fuel is implemented. The cetane number is estimated from the magnitude of engine torque produced by combustion of the injected fuel. By setting the upper-limit rotation speed NEmax to a smaller value as the vehicle speed SPD is higher, the apparatus restrains variations of the ignition delay time, and heightens the accuracy of the estimation of the cetane number.
Bibliography:Application Number: CN2013817266