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Method for operating a fuel injector

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

Active Publication Date: 2019-11-26
ROBERT BOSCH GMBH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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 a fuel injector
  • Method for operating a fuel injector
  • Method for operating a fuel injector

Examples

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Embodiment Construction

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

[0022] Since methane has such a high fl...

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Abstract

The invention relates to a method for operating a fuel injector having two coaxially arranged nozzle needles (1, 2) which are guided one inside the other and which serve for introducing a first fuel,for example natural gas, and a second fuel, for example diesel fuel, into a combustion chamber of an internal combustion engine, in which method the two nozzle needles (1, 2) are opened in a time-offset manner by means of two control valves (3, 4), and the inner nozzle needle (2) is carried along at least over a partial stroke range during the opening of the outer nozzle needle (1). According to the invention, during the activation phase of the control valve (3) assigned to the outer nozzle needle (1) for the purposes of opening the outer nozzle needle (1), the control valve (4) assigned to the inner nozzle needle (2) is at least temporarily likewise activated such that an increase of a control pressure prevailing at the inner nozzle needle (2) is counteracted without opening the inner nozzle needle (2).

Description

technical field [0001] The invention relates to a method for operating a fuel injector. A first fuel, for example natural gas, and a second fuel, for example 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 arranged coaxially and guided one inside the other. Background technique [0002] In the so-called NGDI injection method (English: Natural Gas Direct Injection, 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 preceding diesel pilot injection (Piloteinspritzung). And burn by diffusion. Compared with traditional diesel combustion, this combustion method has the following advantages: CO2 emission can be reduced up to 25%. In addition, fuel costs can be reduced. Furthermore, the combustion process has a simi...

Claims

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Application Information

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Patent Type & Authority Applications(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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