公开(公告)号：US20090177367A1

公开(公告)日：2009-07-09

申请号：US12339464

申请日：2008-12-19

申请人： Masahiro TOYOHARA ,  Takao Miyaki ,  Masahiro Sasaki ,  Takuya Mayuzumi

发明人： Masahiro TOYOHARA ,  Takao Miyaki ,  Masahiro Sasaki ,  Takuya Mayuzumi

IPC分类号： F02D41/30

CPC分类号： F02D41/20 ,  F02D2041/2003 ,  F02D2041/2044 ,  F02D2200/0602

摘要： Disclosed herein is a fuel injection control apparatus for an internal combustion engine, capable of opening and closing accurately a valve of the fuel injector even when the quantity of injection required is small and a pulse duration of a driving pulse signal to the fuel injector is short.A fuel injector pulse width computing unit 9a calculates, from the operational state of the internal combustion engine and the fuel pressure detected by a fuel pressure sensor, pulse width of a pulse signal which drives the valve of the fuel injector. After an valve-opening command has turned on and a high valve-opening current for opening the fuel injector valve has been supplied from a high-voltage source to the fuel injector, a fuel injector driving signal waveform command unit 9b discharges the current and supplies from a low-voltage source a small hold current Ih2 that allows the fuel injector to maintain the valve-open state. Also, during the time from supply of the valve-opening current to an arrival at the value of the hold current Ih2, after the elapse of a previously assigned rapid-discharge starting time Tsy from the turn-on of the valve-opening command, the fuel injector driving signal waveform command unit 9b rapidly discharges the current until the hold current Ih2 has been reached.

摘要翻译： 本文公开了一种用于内燃机的燃料喷射控制装置，即使当所需喷射量小并且到燃料喷射器的驱动脉冲信号的脉冲持续时间短时，也能够精确地打开和关闭燃料喷射器的阀 。 燃料喷射器脉冲宽度计算单元9a从内燃机的操作状态和由燃料压力传感器检测到的燃料压力计算驱动燃料喷射器的阀的脉冲信号的脉冲宽度。 在阀开启指令已经打开并且用于打开燃料喷射阀的高阀打开电流已经从高压源提供给燃料喷射器之后，燃料喷射器驱动信号波形指令单元9b将电流和电源 来自低压源的小保持电流Ih2，允许燃料喷射器保持阀打开状态。 此外，在从开阀电流的供给到保持电流Ih2的值的时间期间，在开阀指令的接通之后经过预先指定的快速放电开始时间Tsy之后， 燃料喷射器驱动信号波形指令单元9b快速放电，直到达到保持电流Ih2。