Measuring and testing – Fluid pressure gauge – Diaphragm
Patent
1997-12-16
1999-02-02
Oen, William
Measuring and testing
Fluid pressure gauge
Diaphragm
G01L 902
Patent
active
058668225
DESCRIPTION:
BRIEF SUMMARY
This application is a 371 of PCT/EP96/01807 filed Apr. 30, 1996.
PRIOR ART
The invention relates to a device for measuring a plurality of fluid pressures. It is intended in particular for mounting on a hydraulic block that is used for hydraulic control of a vehicle brake system.
In hydraulic external-force brake systems, which are equipped with an electrically driven hydraulic pump for generating fuel pressure, it is necessary to measure the brake fluid pressure in wheel brake cylinders and at other points in the brake system such as in a master cylinder or a hydraulic reservoir.
It is known to measure the brake fluid pressure at the various points of the brake system using one pressure sensor each, which is mounted at the respective point or centrally on the hydraulic block and communicates with the various points of the brake system over hydraulic lines. This has the disadvantage of major construction effort and expense.
ADVANTAGES OF THE INVENTION
The pressure measuring device of the invention has a sensor plate with a plurality of measuring diaphragms for measuring various pressures. It is intended especially for hydraulic vehicle brake systems, but can be used equally well for measuring the pressures of any arbitrary fluids. The measuring diaphragms are distributed uniformly in matrixlike fashion on the sensor plate. They can be located for instance at the corners of imaginary equilateral triangles (triangular matrix) or squares (square matrix), or may for instance be distributed equidistantly on one or more imaginary concentric circles.
Fastening devices of the sensor plate, such as screw holes, are arranged uniformly around each measuring diaphragm, and as a result individual fastening devices are simultaneously surrounded by a plurality of measuring diaphragms. Each measuring diaphragm is surrounded by an equal number of fastening devices, which are preferably all spaced equally apart from the respective measuring diaphragm. For instance, if the measuring diaphragms and fastening devices are disposed on triangular matrixes or square matrixes, each measuring diaphragm is located in the middle of an imaginary equilateral triangle or square, whose corners are formed by the fastening devices that surround the measuring diaphragm. In an equidistant arrangement of the measuring diaphragms on a circle, one fastening device is for instance located in the middle of the circle, and a number of fastening devices that equals the number of measuring diaphragms is disposed on a center bisector between each two measuring diaphragms, on a concentric circle surrounding the measuring diaphragms, so that each measuring diaphragm is located between each group of three fastening devices.
The invention has the advantage that a requisite number of measuring diaphragms can be accommodated in a simple way all on the same sensor plate. The mounting and sealing of the sensor plate, for instance on a hydraulic block, are simple and can be accomplished quickly; the pressure sensors required can be manufactured economically. The measuring diaphragms are nearly strain-free, which is a prerequisite for accurate measurements with minimal error over a long period of use. By means of the matching disposition of each measuring diaphragm between the same number of fastening devices, the measuring diaphragms are deformed identically when pressure is imposed, so that for the same pressure, each measuring diaphragm furnishes an identical measurement signal.
Another advantage of the invention is that the measuring diaphragms of the sensor plate, which are disposed close together, and the selected disposition of the measuring diaphragms relative to one another make rapid electrical contacting with a central evaluation circuit possible, which again increases the precision of measurement. In particular, plug connections and long cables between the measuring diaphragms and the evaluation circuit, which from corrosion and aging can lead to elevated transition resistances and can make the outcome of measurement wrong, are unnecessary.
To
REFERENCES:
patent: 5333504 (1994-08-01), Lutz et al.
patent: 5528214 (1996-06-01), Koga et al.
Greigg Edwin E.
Greigg Ronald E.
Oen William
Robert & Bosch GmbH
LandOfFree
Pressure sensor plate having a plurality of measuring diaphragms does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Pressure sensor plate having a plurality of measuring diaphragms, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Pressure sensor plate having a plurality of measuring diaphragms will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-1119324