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Device for measuring mass of a flowing medium

A quality and flow tube technology, which is applied in the field of devices for measuring the quality of a flowing medium, can solve problems such as harshness and disturbing noise, and achieve the effect of reducing disturbing noise and improving measurement accuracy.

Inactive Publication Date: 2004-11-10
ROBERT BOSCH GMBH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, this flow tube known from DE 43 40 882 A1 is basically approved, however, the disadvantage is that harsh whistle-like disturbing noises can occur during actual operation

Method used

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  • Device for measuring mass of a flowing medium
  • Device for measuring mass of a flowing medium
  • Device for measuring mass of a flowing medium

Examples

Experimental program
Comparison scheme
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Embodiment Construction

[0016] The device 1 shown in sectional view in FIG. 1 serves to measure the mass of a medium flowing in a line 2 , in particular the intake air mass of an internal combustion engine. The device 1 can be mounted, for example, by means of connecting flanges not shown at the ends as a mountable intermediate part in an intake duct by means of which the internal combustion engine is fed from the surroundings by an air filter not shown. Ambient air is drawn in, which enters a combustion chamber of the internal combustion engine via a throttle valve sleeve, not shown, which is provided for controlling the intake air quality.

[0017] The device 1 comprises a flow tube 3 which is arranged approximately in the middle of the tube 2 and which is mounted on the inner wall 5 of the tube 2 by means of a substrate 4 which is schematically shown in the figure. Here, a plurality of substrates 4 can be provided, which are offset relative to one another by an angle of, for example, 120° or 90°. ...

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PUM

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Abstract

The invention relates to a device (1) for measuring the mass of a medium, especially the induction air mass of an internal combustion engine, flowing in a line (2). Said device comprises a flow tube (3) which is arranged in the line (2). A measuring element (20) around which the flowing medium flows is arranged in the flow tube (3). The medium flows from the line (2) and into the flow tube (3) at the inlet opening (9), and flows out of the flow tube and into the line (2) at an outlet opening (11). An outlet front face (12) of the flow tube (3), said front face enclosing the outlet opening (11), comprises structural grooves (53) which, with a radial directional component, extend in relation to a longitudinal axis (6) of the flow tube (3).

Description

technical field [0001] The invention relates to a device for measuring the quality of a flowing medium. Background technique [0002] Known from EP 0 087 621 B1 is a device for measuring the mass of a flow medium in a duct, in particular the intake air mass of an internal combustion engine, in which a into a measuring element, for example in the form of a hot wire. By opening and closing the intake valves of the individual cylinders of the internal combustion engine, large fluctuations or pulsations of the flow velocity occur in the bypass channel, the magnitude of which depends on the intake frequency of the individual pistons or on the rotational speed of the internal combustion engine. Such flow fluctuations can substantially falsify the measurement results, namely the flow velocity in the center of the bypass duct and the intake air mass of the internal combustion engine which can be calculated therefrom. For example, depending on the pulsation intensity of the flow ve...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01F1/684G01F5/00G01F15/00G10K11/16
CPCG01F5/00G01F1/6842G01F15/00G10K11/161G01F1/684
Inventor 迪特尔·汤克乌韦·康策尔曼
Owner ROBERT BOSCH GMBH