Method of controlling rail pressure

Method of controlling rail pressure

A method for controlling rail pressure in a fuel supply system comprising a fuel pump 1, at least one injector 4 and a rail 3 connecting the injector to the pump, comprises the steps of establishing a relationship between rail pressure and a leak rate of the injector, estimating a fuel drain rate fr...

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Hauptverfasser: EUGENIO PISONI, MAURA DINTINO, VINCENZO RAMPINO
Format: Patent
Sprache:eng
Schlagworte:
BLASTING
COMBUSTION ENGINES
CONTROLLING COMBUSTION ENGINES
HEATING
HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
LIGHTING
MECHANICAL ENGINEERING
WEAPONS
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creator EUGENIO PISONI
MAURA DINTINO
VINCENZO RAMPINO
description A method for controlling rail pressure in a fuel supply system comprising a fuel pump 1, at least one injector 4 and a rail 3 connecting the injector to the pump, comprises the steps of establishing a relationship between rail pressure and a leak rate of the injector, estimating a fuel drain rate from the rail based on a fuel injection rate, rail pressure and rail pressure/leak rate relationship; estimating a desired intake flow rate of the pump based on fuel drain rate and controlling the pump to operate at a desired intake flow rate. The method may also comprise the step of establishing a relationship between rail pressure and efficiency of the pump to estimate the desired intake flow and Preferably the rail pressure/leak rate relationship is established as a function of injector excitation time or fuel temperature, specifies an engine speed weighted sum of at least a static leak rate and a dynamic leak rate. A controller is also claimed.
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The method may also comprise the step of establishing a relationship between rail pressure and efficiency of the pump to estimate the desired intake flow and Preferably the rail pressure/leak rate relationship is established as a function of injector excitation time or fuel temperature, specifies an engine speed weighted sum of at least a static leak rate and a dynamic leak rate. 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subjects BLASTING
COMBUSTION ENGINES
CONTROLLING COMBUSTION ENGINES
HEATING
HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
LIGHTING
MECHANICAL ENGINEERING
WEAPONS
title Method of controlling rail pressure
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