Communications: electrical – Land vehicle alarms or indicators – Internal alarm or indicator responsive to a condition of the...
Patent
1988-07-14
1990-06-26
Orsino, Joseph A.
Communications: electrical
Land vehicle alarms or indicators
Internal alarm or indicator responsive to a condition of the...
73728, 336 30, B60Q 100
Patent
active
049375539
DESCRIPTION:
BRIEF SUMMARY
The instant invention relates to an electrohydraulic device for continuously monitoring the pressure in a hydraulic brake system for automotive vehicles, in particular for outputting electric control signals in dependence upon applied pressure signals, the said device being composed of a housing having two coaxial bores, a receiver arranged in the housing and applicable by the inlet pressure, as well as a converter for converting the hydraulic pressure into an electric output signal.
For governing and monitoring the pressure of a hydraulic brake system, it is already known to use a pressure and alarm switch which permits to transmit the hydraulic pressure via an axially displaceable piston onto mechanically actuatable customary microswitches.
In this arrangement, it is prevented by sealedly accommodating the piston within the housing that the pressure-transmitting medium acting upon an end surface of the piston gets into contact with the mechanic microswitches. This way, sufficient useful life and/or resistance of the pressure and alarm switch to aging is accomplished even when chemically aggressive pressure-transmitting media are used. However, ,such microswitches are relatively complicated, and sealing a displaceable piston which is applied by a pressure-transmitting medium subject to high pressure entails difficulties in principle.
Therefore, it is an object of the present invention to overcome this shortcoming and to develop a device for monitoring the pressure in a hydraulic brake system which is characterized above all by simple design, long useful life, great reliability and little expenditure in manufacture. Furthermore, sufficient response sensitivity and precise reaction to pressure variations are demanded.
It has proved now that this object can be achieved in a simple, yet technically progressive manner by improving upon a device of the type initially referred to in a way such that the receiver is formed of a membrane of amorphous metal with changing permeability that cooperates with a coil system used as a converter, the output signals of which can be supplied to an evaluating electronic system. Owing to the use of amorphous metal, a cost-effective and efficient solution is achieved which has three major advantages: possibility of `adjustment` of the hysteresis shape by variation of the alloy compositions of the amorphous metal and by heat treatment methods; variations can be sensed.
A particularly effective improvement of the inventive subject matter provides that the membrane is abutting on an end surface of a partition wall isolating the first bore from the second bore and is clamped in its fringe area by means of a setscrew, the said partition wall comprising an axial recess and the coil system being arranged in the second bore.
According to a further advantageous feature of this invention, the membrane is of circular design, what accomplishes a particularly simple sealing attachment.
In order to augment the sensitivity of the electrohydraulic device according to this invention, the membrane is of rectangular shape, and it is located such that its longitudinal axis extends normal to the longitudinal axis of the coil system.
A particularly space-saving arrangement of the inventive device will be achieved in that in the second bore, there is provision of a cylindrical partition wall extending in parallel to said bore's wall and subdividing the second bore into an annular chamber and an inside chamber, the coil system being placed in the annular chamber, whilst the inside chamber is destined to accommodate the evaluating electronic system.
Further details and advantages of the inventive device will become more apparent from the subclaims as well as from the description of two embodiments of this invention which hereinbelow will be explained in more detail with reference to the accompanying drawings, wherein parts corresponding to each other have been assigned like reference numerals.
The drawings display in a schematically simplified view:
FIG. 1 a circuit diagram of a dual-circuit hydraulic b
REFERENCES:
patent: 4581914 (1986-04-01), Obermann et al.
patent: 4696192 (1987-09-01), Yamashita et al.
Alfred Teves GmbH
Hofsass Jeffery A.
Orsino Joseph A.
Seitter Robert P.
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