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Method for operating fuel injectors

A fuel injector and fuel technology, which is applied to fuel injection devices, charging systems, machines/engines, etc., can solve the problems of control pressure rise, hinder the opening of the outer nozzle needle, etc., and achieve the effect of full injection rate and shape

Active Publication Date: 2022-05-24
ROBERT BOSCH GMBH
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  • Summary
  • Abstract
  • Description
  • Claims
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AI Technical Summary

Problems solved by technology

This leads to an undesired increase in the control pressure acting on the inner nozzle needle, which creates a counter force which prevents the opening of the outer nozzle needle

Method used

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  • Method for operating fuel injectors
  • Method for operating fuel injectors
  • Method for operating fuel injectors

Examples

Experimental program
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Embodiment Construction

[0021] from figure 1 A fuel injector suitable for carrying out the method of the present invention is known from the schematic diagram of . The fuel injector has a nozzle body 17 and two nozzle needles 1 , 2 which are arranged coaxially and are guided in one another. For this purpose, the outer nozzle needle 1 for releasing and closing the insufflation opening 11 for the gaseous fuel is embodied as a hollow needle. The injection opening 12 for injecting the liquid fuel can be controlled by the inner nozzle needle 2 , which is now completely received in the outer nozzle needle 1 while forming the pressure chamber 16 . Liquid fuel is supplied to the injection openings 12 via the pressure chamber 16 . The gaseous fuel reaches the blow-in opening 11 through a pressure chamber 15 which is bounded on the one hand by the nozzle body 17 and on the other hand by the outer nozzle needle 1 . The liquid fuel can in particular be natural gas or methane, and the liquid fuel can be diesel...

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Abstract

The invention relates to a method for operating a fuel injector having two nozzle needles (1, 2) arranged coaxially and guided inside one another, said nozzle needles serving to inject a first fuel For example natural gas and a second fuel such as diesel fuel are introduced into the combustion chamber of the internal combustion engine, in the method the two nozzle needles (1,2) are opened with a time offset by means of two control valves (3,4) , and when the outer nozzle needle (1) opens, the inner nozzle needle (2) is guided along with it at least over the partial stroke range. According to the invention, during the actuation phase of the control valve (3) associated with the outer nozzle needle (1) for opening the outer nozzle needle (1), at least temporarily also actuates the associated inner nozzle needle ( 2) in such a way that the rise in control pressure acting on the inner nozzle needle (2) is resisted without causing the inner nozzle needle (2) to open.

Description

technical field [0001] The present invention relates to a method for operating a fuel injector. A first fuel, eg natural gas, and a second fuel, eg diesel fuel, can be introduced into the combustion chamber of the internal combustion engine by means of the fuel injector. For this purpose, the fuel injector has two nozzle needles which are arranged coaxially and are guided within one another. Background technique [0002] In the so-called NGDI injection method (English: Natural Gas Direct Injection), natural gas or methane is blown directly into the combustion chamber of the internal combustion engine under high pressure, and is ignited by means of a diesel pilot injection performed previously. and burns in a diffuse manner. This combustion method has the following advantages over conventional diesel combustion: CO2 emissions can be reduced by up to 25%. In addition, fuel costs can be reduced. Furthermore, the combustion process has similar combustion characteristics and ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F02M43/04
CPCF02M43/04F02M45/04F02M45/086F02M47/027
Inventor D·布拉特雷尔G·吉尔林格R·米特
Owner ROBERT BOSCH GMBH
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