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Method for determining the opening point in time of a fuel injector

A fuel injector, opening time technology, applied in the direction of fuel injection device, fuel injection control, charging system, etc., can solve problems such as influence

Active Publication Date: 2013-08-28
VTESCO TECH GMBH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But the downside of the low voltage concept is that the battery voltage in a car can fluctuate in a relatively large range from typically 6 volts to 19 volts depending on the operating conditions
This causes the force build-up on this coil driver or solenoid actuator to be influenced by the current drive voltage

Method used

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  • Method for determining the opening point in time of a fuel injector
  • Method for determining the opening point in time of a fuel injector
  • Method for determining the opening point in time of a fuel injector

Examples

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Embodiment Construction

[0054] figure 1 The pressure curves in the fuel supply lines for indirectly actuated fuel injectors are shown for different battery voltages which are used within the scope of the low pressure concept for controlling the control valves of the indirectly actuated fuel injectors coil. The opening times of the control valves of the indirectly actuated fuel injectors are each derived from the pronounced pressure drop and at figure 1are represented by solid circles, respectively. The dotted line 161 represents the pressure curve at the first battery voltage U1. The corresponding opening time is indicated with reference symbol 161a. The dashed line 162 represents the pressure curve at a second battery voltage U2 , wherein the second battery voltage U2 is greater than the first battery voltage U1 . The corresponding opening time is indicated with reference symbol 162a. The solid line 163 represents the pressure curve at the third battery voltage U3 , wherein the third battery ...

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Abstract

The invention relates to a method for determining the opening point in time of a control valve (520) having a coil drive of an indirectly driven fuel injector (500) for an internal combustion engine of a motor vehicle. The method comprises: (a) detecting the time curve of the current intensity of a current flowing through the coil drive, (b) determining a current integral with respect to the detected current intensity as a function of the time and starting from a defined initial time, and (c) determining a time at which the current integral reaches at least a predefined current integral reference value, wherein the determined time is the opening point in time of the control valve. The invention further relates to a corresponding device and to a computer programme for determining the opening point in time of a control valve of an indirectly driven fuel injector.

Description

technical field [0001] The invention relates to the technical field of control of indirectly driven fuel injectors. The invention relates in particular to a method for determining the opening time of a control valve of an indirectly actuated fuel injector, the control valve having a coil drive. Furthermore, the invention relates to a corresponding device and a computer program for determining the opening time of a control valve of an indirectly actuated fuel injector, the control valve having a coil drive. Background technique [0002] In indirectly driven fuel injectors, so-called solenoid actuators actuate the valve piston of a control valve or servo valve, the pressure ratio between the control chamber and the valve chamber being influenced by the control valve or servo valve. The movement of the valve needle of the fuel injector is determined here in each case by the prevailing force ratio, wherein the force ratio is determined by the spring and the pressure in the cont...

Claims

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Application Information

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IPC IPC(8): F02D41/20
CPCF02D41/20F02D41/00F02D41/3005F02M65/005
Inventor M.布兰特C.弗兰肯贝格尔
Owner VTESCO TECH GMBH
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