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Device including injector and sensor

A technology of injectors and optical sensors, applied in the field of fuel injection systems and operating such devices, can solve the problems of no longer maintaining the specifications of the injection system, and achieve the effect of reliable opening and closing characteristics

Inactive Publication Date: 2020-05-26
ROBERT BOSCH GMBH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] Based on the applicable legal regulations, in order to comply with the specified exhaust gas or emission limit values ​​in motor vehicles with internal combustion engines, it is of interest to continuously monitor the pressure relationship in the individual injectors of the internal combustion engine with regard to the injection characteristics, so that it can be as possible as possible. It is possible to detect aging effects or drift effects in advance, which lead to the fact that the predetermined specification of the injection system is no longer maintained

Method used

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  • Device including injector and sensor
  • Device including injector and sensor
  • Device including injector and sensor

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Embodiment Construction

[0038] figure 1 The device according to the invention, generally designated 10 , is shown schematically in longitudinal section and has an optical fiber 11 with a fiber Bragg grating 12 inserted in the optical fiber and an injector 13 . In the injector 13 , which is preferably configured as a common rail injector, a nozzle needle 15 is received substantially axially displaceably along the injector longitudinal center axis 14 , which protrudes into the pressure chamber 17 and extends obliquely to the longitudinal center axis. The pressure channel 17' leads into this pressure chamber for supplying fuel. In order to detect the force and pressure relationships in the injector 13 and in particular the opening and closing behavior of the nozzle needle 15, the optical fiber 11 is introduced together with a fiber Bragg grating into the blind hole 16 of the injector 11, which is drawn from the injector 13 extends outside the housing and ends in the vicinity of the pressure chamber 17 ...

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Abstract

The device (10) according to the invention comprises an injector (13) with a valve needle (15) protruding into a pressure chamber (17) and an optical sensor having an optical fiber (11) with a fiber Bragg grating (12) ), wherein the optical fiber (11) is fixedly arranged in the injector (13) so as to construct a first optical signal when light is input from a light source into the optical fiber (11), as the optical fiber The wavelength variation of light reflected at the Bragg grating (12) relative to the input light, said optical signal is a measure of the force acting on said optical fiber (11) from said pressure chamber (17), wherein, can depend on An active surface (22') deformable under pressure is constructed in said injector (13) in order to feed back light from said optical fiber (11) to said injector (13) depending on the degree of deformation of said active surface (22'). In the optical fiber (11), wherein, as a second signal, the intensity of the light fed back is a measure of the pressure from the pressure chamber (17) deforming the optical fiber (11), wherein the valve The opening and closing behavior of the needle (15) can be determined from the correlation of the two optical signals.

Description

technical field [0001] The invention relates to a device comprising an injector and an optical sensor. The invention also relates to a fuel injection system comprising at least one such device. Furthermore, the invention relates to a method for operating such a device. Background technique [0002] Based on the applicable legal regulations, in order to comply with the specified exhaust gas or emission limit values ​​in motor vehicles with internal combustion engines, it is of interest to continuously monitor the pressure relationship in the individual injectors of the internal combustion engine with regard to the injection characteristics, so that it can be as possible as possible. It is possible to detect aging effects or drift effects in advance, which lead to the fact that the predetermined specifications of the injection system are no longer maintained. Common solutions or concepts, for example in common rail injectors, start from the detection of the rail pressure by ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01M11/08G01L3/16
CPCG01L3/16G01M11/085
Inventor R·吉泽恩登纳-托比恩B·施图克
Owner ROBERT BOSCH GMBH