Electricity: measuring and testing – Electromechanical switching device – Relay
Patent
1989-03-28
1991-02-05
Strecker, Gerard R.
Electricity: measuring and testing
Electromechanical switching device
Relay
324423, 340644, G01R 3102
Patent
active
049908545
DESCRIPTION:
BRIEF SUMMARY
The invention is directed to a process as well as a device for automatically detecting the response voltage of an electromagnetic component, in particular an electrovalve. The function of electromagnetic components, particularly electrovalves, e.g. in injection systems and anti-lock systems of brake systems, must often be tested e.g. in motor vehicles. In known processes and devices which are used for this purpose (DE-OS 23 52 493; DE-OS 22 51 472), the fact that the movement of a magnet armature in the coil of an electrovalve causes a change in inductance is evaluated. As a result of this, the strength of current of the current flowing through the coil of the electrovalve decreases during the movement of the magnet armature. This change of the strength of current is determined by means of a differential element and utilized for testing the functioning of the electrovalve. If a determined drop in the strength of current is detected by means of the differential element, this means that the magnet armature of the valve has moved; otherwise, there is an error. In the known processes and devices, however, the function testing is restricted to whether or not the magnet armature of the electrovalve moves at all.
ADVANTAGES OF THE INVENTION
In contrast, the process, according to the invention, as well as the device for implementing the process, have the advantage that the operating behavior of an electromagnetic component, particularly an electrovalve, can be exactly determined. For this purpose, the minimum response voltage of the component is detected automatically in that an increasing testing voltage is applied to the electromagnetic component and the testing voltage at which the electromagnetic component responds is determined and indicated in that the decrease of current flowing through the component which occurs during the response of the component is detected and utilized for fixing and indicating the instantaneous value of the testing voltage. In this way, it can not only be determined whether or not the electromagnetic component reacts at all, i.e. whether or not the electrovalve attracts, but also the minimum voltage at which it responds can be determined. Accordingly, not only can stuck electrovalves be detected, but also electrovalves which are slow to react.
The process and device, according to the invention, enable a simple and accurate determination of the response voltage without the need to dismantle the electromagnetic component. Errors caused by operating personnel are eliminated.
DRAWING
The invention is explained in more detail below by means of the drawings showing the embodiment examples.
FIG. 1 shows a basic circuit diagram of the device of the invention;
FIG. 2 shows an embodiment example of the device, according to FIG. 1 and
FIG. 3 shows another embodiment example of the device according to FIG. 1.
DESCRIPTION OF THE EMBODIMENT EXAMPLES
FIG. 1 shows a basic circuit serving to illustrate the operation of the device and process according to the invention.
A testing voltage is produced by a voltage source, in this case a sawtooth oscillator 2, which testing voltage is amplified by an amplifier 4 to a voltage suitable for actuating an electromagnetic component to be tested, only the actuating coil 6 of the latter being shown here. This voltage is applied to the coil 6 which is connected to ground on the other side. The testing voltage applied to the coil 6 can be indicated by an indicating device 8. A switching device 10 is provided in the line to the indicating device. 8.
The current flowing to the coil 6 of the component under test is directed through a precision resistor 12. The increasing voltage deep across the resistor 12 is measured by a differentiating arrangement 14 which comprises an operational amplifier 141. One side of the precision resistor 12 is connected with the inverting input of the operational amplifier 141 via a first differential capacitor 142 and a first resistor 143. The other side of the precision resistor 12 is connected via a second differential capacito
REFERENCES:
patent: 4205307 (1980-05-01), Liermann et al.
Regan Maura K.
Robert & Bosch GmbH
Strecker Gerard R.
Striker Michael J.
LandOfFree
Process and device for automatically detecting the response volt does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Process and device for automatically detecting the response volt, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Process and device for automatically detecting the response volt will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-12270