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DE3632221A1 - Nullpoint-stabilised charge amplifier - Google Patents

Nullpoint-stabilised charge amplifier

Info

Publication number
DE3632221A1
DE3632221A1 DE19863632221 DE3632221A DE3632221A1 DE 3632221 A1 DE3632221 A1 DE 3632221A1 DE 19863632221 DE19863632221 DE 19863632221 DE 3632221 A DE3632221 A DE 3632221A DE 3632221 A1 DE3632221 A1 DE 3632221A1
Authority
DE
Germany
Prior art keywords
voltage
charge amplifier
periodic
measurement
reference voltage
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
DE19863632221
Other languages
German (de)
Inventor
Gerhard Roth
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
COM COMPUTERORIENT MESSTECH
Original Assignee
COM COMPUTERORIENT MESSTECH
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Family has litigation
First worldwide family litigation filed litigation Critical https://patents.darts-ip.com/?family=3540114&utm_source=google_patent&utm_medium=platform_link&utm_campaign=public_patent_search&patent=DE3632221(A1) "Global patent litigation dataset” by Darts-ip is licensed under a Creative Commons Attribution 4.0 International License.
Application filed by COM COMPUTERORIENT MESSTECH filed Critical COM COMPUTERORIENT MESSTECH
Publication of DE3632221A1 publication Critical patent/DE3632221A1/en
Ceased legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01D—MEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVERED IN A SINGLE OTHER SUBCLASS; TARIFF METERING APPARATUS; MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR
    • G01D3/00—Indicating or recording apparatus with provision for the special purposes referred to in the subgroups
    • G01D3/06—Indicating or recording apparatus with provision for the special purposes referred to in the subgroups with provision for operation by a null method
    • G01D3/063—Comparing the measuring value with a reference value which periodically or incidentally scans the measuring range
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
    • G01L23/00—Devices or apparatus for measuring or indicating or recording rapid changes, such as oscillations, in the pressure of steam, gas, or liquid; Indicators for determining work or energy of steam, internal-combustion, or other fluid-pressure engines from the condition of the working fluid
    • G01L23/08—Devices or apparatus for measuring or indicating or recording rapid changes, such as oscillations, in the pressure of steam, gas, or liquid; Indicators for determining work or energy of steam, internal-combustion, or other fluid-pressure engines from the condition of the working fluid operated electrically
    • G01L23/10—Devices or apparatus for measuring or indicating or recording rapid changes, such as oscillations, in the pressure of steam, gas, or liquid; Indicators for determining work or energy of steam, internal-combustion, or other fluid-pressure engines from the condition of the working fluid operated electrically by pressure-sensitive members of the piezoelectric type
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
    • G01M15/00—Testing of engines
    • G01M15/04—Testing internal-combustion engines
    • G01M15/08—Testing internal-combustion engines by monitoring pressure in cylinders

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Combustion & Propulsion (AREA)
  • Measuring Fluid Pressure (AREA)

Abstract

In order to balance out the nullpoint drift in connection with piezoelectric sensors evaluated by means of a charge amplifier, a reference voltage is assigned to an arbitrary point in time in the period of the measurement signal. By means of a periodic comparison of the reference voltage with the actual voltage at this point in time, a difference voltage is determined in each case, which is used to correct the voltage level of the measurement signal in the next period. <IMAGE>

Description

Die Erfindung bezieht sich auf einen Ladungsverstärker zur Verstärkung der Meßsignale periodischer Vorgänge von piezoelektrischen Aufnehmern.The invention relates to a charge amplifier for Amplification of the measurement signals of periodic processes of piezoelectric Sensors.

Bekannte Ladungsverstärker haben den Nachteil, daß sie keinen definierten Nullpunkt besitzen und daher für eine unmittelbare Absolutwertmessung nicht geeignet sind.Known charge amplifiers have the disadvantage that they do not have defined zero point and therefore for an immediate Absolute value measurements are not suitable.

Die Erfindung stellt sich die Aufgabe, dieses Problem für die Messung periodischer Vorgänge insbesondere in der Verbrennungsmotorendruckindizierung zu lösen.The invention has as its object this problem the measurement of periodic processes, particularly in engine pressure indication to solve.

Diese Aufgabe wird erfindungsgemäß dadurch gelöst, daß ein Ladungsverstärker mit einer zeitlichen Bezugsbasis (Kurbelwinkelmarkierung) gekoppelt wird (Fig. 1). Dadurch ist es möglich, einem beliebigen Zeitpunkt innerhalb einer Periode (Verbrennungszyklus) eine Referenzspannung zuzuordnen (Fig. 2). Driftet nun das Meßsignal, so ist die Spannung des Meßsignals im folgenden Zyklus beim Referenzzeitpunkt (Referenzkurbelwinkel α Ref ) ungleich der eingegebenen Referenzspannung U Ref . Eine eingebaute Logik ermittelt in Echtzeit die Differenzspannung und korrigiert das Meßsignal bei Beginn des nächsten Zyklus um die Differenzspannung auf das ursprüngliche Spannungsniveau. Dieser Vorgang wiederholt sich Zyklus für Zyklus und gewährleistet dadurch ein nullpunktstabiles Drucksignal mit richtigen Absolutwerten. Die Erfindung bedeutet besonders für ungekühlte Quarzdruckaufnehmer, die bei unstationären Vorgängen eine zu Fehldruckanzeigen führende Temperaturdrift durchmachen, einen großen Fortschritt. According to the invention, this object is achieved in that a charge amplifier is coupled to a temporal reference basis (crank angle marking) ( FIG. 1). This makes it possible to assign a reference voltage to any point in time within a period (combustion cycle) ( FIG. 2). If the measurement signal drifts, the voltage of the measurement signal in the following cycle at the reference time (reference crank angle α Ref ) is not equal to the entered reference voltage U Ref . A built-in logic determines the differential voltage in real time and corrects the measurement signal at the beginning of the next cycle by the differential voltage to the original voltage level. This process is repeated cycle by cycle and thus ensures a zero-point stable pressure signal with correct absolute values. The invention is a major step forward, particularly for uncooled quartz pressure transducers which undergo a temperature drift leading to incorrect pressure readings during non-stationary processes.

Die Erfindung wird nachstehend anhand der Zeichnung näher erläutert. Es zeigenThe invention is described below with reference to the drawing explained in more detail. Show it

Fig. 1 einen Ladungsverstärker mit Kurbelwellenmarkierung in einer Prinzipanordnung und Fig. 1 shows a charge amplifier with crankshaft marking in a basic arrangement and

Fig. 2 ein Wahldiagramm von Referenzwinkel und Referenzspannung zur Nullpunktstabilisierung. Fig. 2 is a choice diagram of the reference angle and reference voltage for zero point stabilization.

In den Figuren werden dabei folgende Bezeichnungen verwendet:
1 Quarzdruckaufnehmer
2 Ladungsverstärker
3 Kurbelwellenmarkierung
4 Referenzwinkel α Ref
5 Referenzspannung U Ref
6 Absolutwertrichtiges Drucksignal
7 Referenzspannung U Ref
8 Differenzspannung Δ U
9 Istspannung
I Meßkurve des ersten Zyklus
II Meßkurve des zweiten Zyklus
α KurbelwellenwinkelThe following designations are used in the figures:
1 quartz pressure transducer
2 charge amplifiers
3 crankshaft marking
4 reference angle α Ref
5 reference voltage U Ref
6 Absolute correct pressure signal
7 reference voltage U Ref
8 differential voltage Δ U
9 actual voltage
I curve of the first cycle
II curve of the second cycle
α crankshaft angle

Claims (5)

1) Ladungsverstärker zur Verstärkung periodischer Meßsignale piezoelektrischer Sensoren, der mit einer zeitlichen Bezugsbasis gekoppelt ist, mit deren Hilfe einem beliebigen Zeitpunkt der Periode eine frei wählbare Referenzspannung zugeordnet werden kann, sodaß durch einen periodischen Vergleich von Istspannung und Referenzspannung und periodische Korrektur des Spannungsniveaus um die jeweilige Differenzspannung eine Absolutwertmessung möglich ist. 1) Charge amplifier for amplifying periodic measurement signals piezoelectric sensors with a temporal reference with the help of any time a freely selectable reference voltage is assigned to the period can be, so that by a periodic comparison of actual voltage and reference voltage and periodic correction the voltage level around the respective differential voltage an absolute value measurement is possible.   2) Einrichtung nach Anspruch 1) dadurch gekennzeichnet, daß als zeitliche Bezugsbasis eine Kurbelwinkelmarkierung mit verbrennungszyklusweiser Triggerung verwendet wird, sodaß als Referenzwinkel ein Punkt bekannten Druckes verwendet werden kann (z. B. bei Einsatz thermodynamischer Rechenmodelle ein Punkt während der Kompression oder im Ladungswechselteil).2) Device according to claim 1), characterized in that a crank angle marking as a time reference combustion cycle triggering is used, so a point of known pressure is used as the reference angle can be used (e.g. when using thermodynamic computing models a point during compression or in the charge exchange part). 3) Einrichtung nach Anspruch 1) dadurch gekennzeichnet, daß eine Referenzspannung digital am Ladungsverstärker eingestellt werden kann oder über einen Spannungseingang als Meßsignal einer Saugrohrdruckmessung oder einer anderen Bezugsgröße eingegeben werden kann.3) Device according to claim 1), characterized in that a reference voltage is digitally set on the charge amplifier can be or via a voltage input as Measurement signal of an intake manifold pressure measurement or another Reference size can be entered. 4) Einrichtung nach Anspruch 1) gekennzeichnet dadurch daß, die periodische Nullpunktskorrektur durch einen Spannungssprung zwischen zwei Zyklen oder nach einer programmierbaren Funktion verlaufend durchgeführt wird.4) Device according to claim 1) characterized in that the periodic zero point correction through a voltage jump between two cycles or after a programmable Function is carried out in progress. 5) Einrichtung nach Anspruch 1) gekennzeichnet dadurch, daß als Eingangsstufe des Ladungsverstärkers eine Schaltung mit J-FET verwendet wird, die gegen Überspannungen und elektrostatische Aufladungen unempfindlich ist.5) Device according to claim 1) characterized in that a circuit with as the input stage of the charge amplifier J-FET is used to protect against surges and electrostatic Charges is insensitive.
DE19863632221 1985-09-24 1986-09-23 Nullpoint-stabilised charge amplifier Ceased DE3632221A1 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
AT277685A AT396634B (en) 1985-09-24 1985-09-24 METHOD FOR PROCESSING PERIODIC MEASURING SIGNALS

Publications (1)

Publication Number Publication Date
DE3632221A1 true DE3632221A1 (en) 1987-04-02

Family

ID=3540114

Family Applications (1)

Application Number Title Priority Date Filing Date
DE19863632221 Ceased DE3632221A1 (en) 1985-09-24 1986-09-23 Nullpoint-stabilised charge amplifier

Country Status (2)

Country Link
AT (1) AT396634B (en)
DE (1) DE3632221A1 (en)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4962328A (en) * 1988-01-25 1990-10-09 AVL Gesellschaft fur Verbrennungskraftmaschinen und Messtechnik mbH., Prof.Dr.Dr.h.c. Hans List Charge amplifier circuit with drift compensation
EP0399069A1 (en) * 1989-05-23 1990-11-28 Siemens Aktiengesellschaft Method to determine with a pressure sensor the combustion pressure in a cylinder of a combustion engine
US5255209A (en) * 1989-05-23 1993-10-19 Siemens Aktiengesellschaft Method for determining the combustion chamber pressure in a cylinder of an internal-combustion engine with a pressure sensor
US5563587A (en) * 1994-03-21 1996-10-08 Rosemount Inc. Current cancellation circuit
EP1519176A1 (en) * 2003-09-19 2005-03-30 Fuji Jukogyo Kabushiki Kaisha Combustion pressure data collection system with multi-cylinder engine with charge amplifiers with correction circuits
US20150135798A1 (en) * 2012-05-02 2015-05-21 Robert Bosch Gmbh Method for ascertaining an offset of an output signal of an evaluation circuit integrated in a sensor, preferably of a pressure sensor installed in a combustion chamber of an internal combustion engine, and sensor

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AT520762B1 (en) * 2017-11-06 2020-04-15 Avl List Gmbh Charge amplifier and measuring system for drift compensation and a method therefor

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1172863B (en) * 1961-06-13 1964-06-25 H H Emschermann Dr Ing Capacitive piston displacement encoder
DE2334788B2 (en) * 1972-07-28 1977-06-30 Kistler Instrumente Ag, Winterthur (Schweiz) PIEZO TRANSDUCER-AMPLIFIER ARRANGEMENT WITH ZEROING DEVICE
DE2944988A1 (en) * 1978-11-08 1980-05-14 Sundstrand Data Control CHARGE AMPLIFIER CIRCUIT
DE2925483B1 (en) * 1979-06-23 1981-01-29 Kistler Instrumente Ag Method and device for measuring and evaluating the peak values of a pulsating voltage measurement signal
DE2829292C2 (en) * 1977-07-15 1986-04-17 List, Hans, Prof. Dipl.-Ing. Dr.Dr.h.c., Graz Device for measuring the angle of rotation of a rotating shaft

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1330497A (en) * 1970-02-27 1973-09-19 Courtaulds Ltd Integrator circuit
AT377132B (en) * 1982-08-26 1985-02-11 List Hans CHARGE AMPLIFIER CIRCUIT

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1172863B (en) * 1961-06-13 1964-06-25 H H Emschermann Dr Ing Capacitive piston displacement encoder
DE2334788B2 (en) * 1972-07-28 1977-06-30 Kistler Instrumente Ag, Winterthur (Schweiz) PIEZO TRANSDUCER-AMPLIFIER ARRANGEMENT WITH ZEROING DEVICE
DE2829292C2 (en) * 1977-07-15 1986-04-17 List, Hans, Prof. Dipl.-Ing. Dr.Dr.h.c., Graz Device for measuring the angle of rotation of a rotating shaft
DE2944988A1 (en) * 1978-11-08 1980-05-14 Sundstrand Data Control CHARGE AMPLIFIER CIRCUIT
DE2925483B1 (en) * 1979-06-23 1981-01-29 Kistler Instrumente Ag Method and device for measuring and evaluating the peak values of a pulsating voltage measurement signal

Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
JP 59-77311 A. In: Patents Abstracts of Japan, P-297, August 29, 1984, Vol. 8, No. 188 *
US-Z: IEEE Transactions on Instrumentation and Measurement, Vol. IM-35, No. 4, December 1986, S. 472-476 *

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4962328A (en) * 1988-01-25 1990-10-09 AVL Gesellschaft fur Verbrennungskraftmaschinen und Messtechnik mbH., Prof.Dr.Dr.h.c. Hans List Charge amplifier circuit with drift compensation
EP0325903A3 (en) * 1988-01-25 1991-01-16 AVL Gesellschaft für Verbrennungskraftmaschinen und Messtechnik mbH.Prof.Dr.Dr.h.c. Hans List Charge amplifier circuit
EP0399069A1 (en) * 1989-05-23 1990-11-28 Siemens Aktiengesellschaft Method to determine with a pressure sensor the combustion pressure in a cylinder of a combustion engine
US5255209A (en) * 1989-05-23 1993-10-19 Siemens Aktiengesellschaft Method for determining the combustion chamber pressure in a cylinder of an internal-combustion engine with a pressure sensor
US5563587A (en) * 1994-03-21 1996-10-08 Rosemount Inc. Current cancellation circuit
EP1519176A1 (en) * 2003-09-19 2005-03-30 Fuji Jukogyo Kabushiki Kaisha Combustion pressure data collection system with multi-cylinder engine with charge amplifiers with correction circuits
US20150135798A1 (en) * 2012-05-02 2015-05-21 Robert Bosch Gmbh Method for ascertaining an offset of an output signal of an evaluation circuit integrated in a sensor, preferably of a pressure sensor installed in a combustion chamber of an internal combustion engine, and sensor
US9518888B2 (en) * 2012-05-02 2016-12-13 Robert Bosch Gmbh Method for ascertaining an offset of an output signal of an evaluation circuit integrated in a sensor, preferably of a pressure sensor installed in a combustion chamber of an internal combustion engine, and sensor

Also Published As

Publication number Publication date
AT396634B (en) 1993-10-25
ATA277685A (en) 1988-10-15

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8101 Request for examination as to novelty
8128 New person/name/address of the agent

Representative=s name: REINHARD, H., DIPL.-CHEM. DR.RER.NAT. SKUHRA, U.,

8105 Search report available
8110 Request for examination paragraph 44
8131 Rejection