Communications: electrical – Continuously variable indicating – With calibration
Patent
1993-03-24
1994-10-11
Wieder, Kenneth A.
Communications: electrical
Continuously variable indicating
With calibration
34087001, 34087019, 324601, G01D 1800
Patent
active
053551290
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND AND SUMMARY OF THE INVENTION
A measuring sensor device 1 for detecting a physical quantity which, via a physical electrical transducer 2, is converted into an equivalent analog electrical quantity and, by means of an analysis circuit 5 connected behind it, which constructionally is not combined with the measuring sensor device 1, is connected to this measuring sensor device 1 by way of electrical lines (Lm1, Lm2, +Us, -Us) used for the transmission of measured values and/or for the energy supply of the measuring sensor device, is converted into quantities, preferably digital data which can be processed further (measuring operation), the physical-electrical transducer 2 being connected in a bridge circuit (measuring bridge 3), and individual branches of the measuring bridge 3, for calibration purposes, being capable of being detuned in a defined manner by the parallel connecting of a shunt resistor (Rs) arranged on the measuring sensor device 1, by way of switches (shunt switches S1, S2) assigned to the analysis circuit 5 and a shunt line Lsh connecting the switches with the shunt resistor (shunt calibration, calibrating operation), and an identification generator 8 being integrated in the measuring sensor device 1 which comprises a nonvolatile memory module 9, 18 with correction data (sensor identification data) of the measuring sensor device 1, as well as a controllable switching element (sh+, sh-) situated in parallel to a branch (R2, R4; R1, R3) of the measuring bridge 3, for the defined detuning of the measuring bridge 13 in the controlled condition, the identification generator 8, in the case of an activatable transmission of the correction data to the analysis circuit 5, switching the controllable switching element (Sh+, Sh-) on and off in the rhythm of the data bit flow read out serially from the memory module 9, 18, and the analysis circuit 5 or a computer connected behind it detecting the analog signals or their changes at the measuring bridge 3 and regenerating the correction data from them which may be used for the correction of the electrical quantities furnished by the physical-electrical transducer 2 (identifying operation), characterized in that, from the identification generator, at least one auxiliary shunt resistor (Rsh+, Rsh-), by way of electrically controllable auxiliary shunt switches (Sh+, Sh-), can be connected in parallel to at least one of the switches (S1, S2) and the shunt resistor (Rs), and in that the identification generator 8 has a circuit 20 which responds to defined pulses or a defined pulse sequence on the shunt line (Lsh) and controls the identification generator 8, and the identification generator 8 can be switched over in its operating mode (measuring operation, calibrating operation) by the superimposing of such pulses or pulse sequences on the shunt line (Lsh) by means of the shunt switches (S1, S2), in the operating mode. generator 8 being switched in such a manner that the measuring sensing is largely unaffected by the identification generator 8, detuned in a defined manner by the shunt switches (S1, S2; Sh+, Sh-) and the shunt resistor (Rs; Rsh+, Rsh-), Sh-) by means of the controlling circuit 20, the correction data can be transmitted via the measuring lines (Lm1, Lm2) from the identification generator 8 to the analysis circuit.
In measuring devices or measuring data detecting and processing systems, it is frequently necessary to place the measuring sensor device with the actual physical-electrical transducer, which detects a physical quantity to be detected and converts it into an electric signal which is equivalent to it, physically away from an analysis circuit for the signal (or measured value) editing and processing. The measuring sensor device and the analysis circuit are then as a rule connected with one another by way of electric lines, the lines, in turn, being connected with the analysis circuit of a plug connection.
The separation of the measuring sensor device and the analysis circuit is frequently for reasons related to space (in order to
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patent: 3439258 (1969-04-01), Van Leeuwen
patent: 4081744 (1978-03-01), Ray
patent: 4298969 (1981-11-01), Rickenbacker
patent: 4621228 (1986-11-01), Toki
patent: 4872007 (1989-10-01), Monterosso
patent: 4881071 (1989-11-01), Monterosso
Dr. Ing. h.c.F. Porsche AG
Solis Jose M.
Wieder Kenneth A.
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