Fuel injection system of internal combustion engine
AssigneeToyota Jidosha Kabushiki Kaisha
InventorTsuneo Tsutsui
Life of this patent
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Abstract
An internal combustion engine provided with a common rail (13) and fuel injectors (3) connected to the common rail (13). When pilot injection is performed, the injection pressure pulsates. At this time, the injection amount of the main injection fluctuates by a certain fluctuation pattern. If indicating on an abscissa a time interval from when pilot injection is started to when main injection is started and indicating on the ordinate a fluctuation amount of main injection, the fluctuation pattern of the injection amount of the main injection becomes a form contracted or expanded in the abscissa direction in accordance with the fuel properties. This characteristic is utilized to find the fluctuation amount of the injection amount of the main injection.
Claims7
A fuel injection system of an internal combustion engine provided with a common rail and fuel injectors connected to the common rail, performing fuel injection from each fuel injector at least the two times of prior injection and later injection during one cycle of the engine, and changing in fluctuation amount of the later injection with respect to a target value depending on a time interval from when the prior injection is performed to when the later injection is performed, said fuel injection system of an internal combustion engine provided with a calculation device for calculating a propagation speed of pressure pulsation generated in a fuel injector at the time of prior injection, estimate fuel properties from the calculated propagation speed, and modifying a control constant of the engine based on the estimated fuel properties.
Dependencies are inferred from the claim text.