EP0654773A1 - Dispositif d'acquisition de signaux - Google Patents

Dispositif d'acquisition de signaux Download PDF

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Publication number
EP0654773A1
EP0654773A1 EP94116768A EP94116768A EP0654773A1 EP 0654773 A1 EP0654773 A1 EP 0654773A1 EP 94116768 A EP94116768 A EP 94116768A EP 94116768 A EP94116768 A EP 94116768A EP 0654773 A1 EP0654773 A1 EP 0654773A1
Authority
EP
European Patent Office
Prior art keywords
signal
connecting line
sensor arrangement
sensor
evaluation circuit
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.)
Granted
Application number
EP94116768A
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German (de)
English (en)
Other versions
EP0654773B1 (fr
Inventor
Robert Dipl.-Ing. Kern
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.)
Robert Bosch GmbH
Original Assignee
Robert Bosch GmbH
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Filing date
Publication date
Application filed by Robert Bosch GmbH filed Critical Robert Bosch GmbH
Publication of EP0654773A1 publication Critical patent/EP0654773A1/fr
Application granted granted Critical
Publication of EP0654773B1 publication Critical patent/EP0654773B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • G—PHYSICS
    • G08—SIGNALLING
    • G08C—TRANSMISSION SYSTEMS FOR MEASURED VALUES, CONTROL OR SIMILAR SIGNALS
    • G08C19/00—Electric signal transmission systems
    • G08C19/16—Electric signal transmission systems in which transmission is by pulses

Definitions

  • the invention is based on a signal detection device according to the preamble of the main claim.
  • a device for cooling the internal combustion engine which controls a fan motor as a function of a temperature which is detected by at least one temperature sensor.
  • PTC resistors for example, are used as temperature sensors and are subjected to a comparatively high quiescent current in order to obtain a high ratio between the usable signal and the interference signal.
  • a signal detection device with an evaluation circuit and with a sensor arrangement remote from the evaluation circuit is known, both the power supply and the signal transmission being carried out via a connecting line between the evaluation circuit and the sensor arrangement.
  • the analog signal emitted by a sensor controls a current sink which flows a current corresponding to the analog signal against the operating mass lets that is provided via the connecting line.
  • the current flowing into the sensor arrangement leads to a voltage drop across a measuring resistor arranged in the evaluation circuit, which drop is further processed by a differential amplifier.
  • the current required by the current sink is superimposed on the operating current required for the energy supply to the sensor arrangement.
  • the required operating current of the sensor arrangement is very low in comparison to the current predetermined by the current sink, so that this component is not taken into account in the evaluation circuit.
  • the invention has for its object to provide a signal detection device with an evaluation circuit and with a sensor arrangement remote from the evaluation circuit, which has a low sensitivity to interference, which act on a line connecting the evaluation circuit and the sensor arrangement, via which both the energy supply of the sensor arrangement and the signal transmission to the evaluation circuit is also carried out.
  • the task is solved by the features specified in the main opening.
  • the signal detection device provides a signal conversion contained in the sensor arrangement, which converts an analog signal provided by a sensor into a digital signal with a variable pulse duty factor and / or variable frequency.
  • a current sink contained in the sensor arrangement which is controlled with this digital signal, influences that in the Connection line flowing current with digital values corresponding to the digital signal. With this measure, a signal transmission of the measured variable detected by the sensor to the evaluation circuit with a high interference signal suppression is possible.
  • the digital current values occurring in the connecting line can be further processed in the evaluation circuit using the simplest means.
  • a particularly advantageous embodiment provides that the digital signal is a pulse-width-modulated signal that is provided for controlling an electric motor connected to the evaluation circuit.
  • the digital current values transmitted via the connecting line can be used in the evaluation circuit directly in control pulses for an output stage.
  • a further advantageous embodiment provides that the connecting line is connected to a resistor arranged in the evaluation circuit, to which a voltage drop corresponding to the current occurs, which can be further processed, for example, by an operational amplifier.
  • An advantageous other embodiment provides that a current mirror circuit is provided in the evaluation circuit, which provides a voltage corresponding to the current flowing in the connecting line with high accuracy.
  • the signal detection device is particularly suitable for use in a motor vehicle in which the connecting line between the sensor arrangement and the evaluation circuit can be exposed to considerable interference signals.
  • a preferred use is for a blower that is driven by an electric motor.
  • the sensor which is designed as a temperature sensor, detects an operating temperature at a predetermined point, which is spatially separated from the evaluation circuit.
  • the signal transmission to the evaluation circuit which is insensitive to interference signals, enables not only a two-point circuit, in which the electric motor driving the fan is switched on and off for a long time, but also clocked operation, in which the electric motor with the pulse-width-modulated signal is set to a predetermined average power can be.
  • the clocked operation requires no further measures in the evaluation circuit.
  • Figure 1 shows a circuit diagram of a signal detection device according to the invention and Figure 2 shows a preferred use in a blower.
  • a sensor 10 outputs an analog signal 11 to a first input 12 of a first operational amplifier 13.
  • a second input 14 of the first operational amplifier 13 receives a triangular voltage signal 16 provided by a delta voltage generator 15.
  • the first operational amplifier 13 and the delta voltage generator 15 are contained in a signal conversion 17, which outputs a digital signal 18 to a current sink 19.
  • the digital signal 18 actuates a switching transistor 20 contained in the current sink 19, which can switch a connection from a connecting line 22 to a ground 23 via a limiter diode 21.
  • the connecting line 22 lies between a sensor arrangement 24 and an evaluation circuit 25.
  • the sensor arrangement 24 contains the sensor 10, the signal conversion 17, the current sink 19 and an energy supply circuit 26.
  • the evaluation circuit 25 contains a second operational amplifier 27 which controls an output stage circuit 28.
  • a first input 29 of the second operational amplifier 27 is connected to the connecting line 22 and a second input 30 of the second operational amplifier 27 is connected to a center tap 31 of a voltage divider which contains a first and a second resistor 32, 33.
  • the first resistor 32 is connected to a first power supply line 34, which leads to a first connection 35 of an energy source 36.
  • the second resistor 33 is connected to a second power supply line 37, which leads to a second connection 38 of the energy source 36.
  • the second connection 38 of the energy source 36 is connected to ground 23.
  • An evaluation resistor 39 is located between the first power supply line 34 and the connecting line 22.
  • An electric motor 40 which can be actuated by the output stage circuit 28, is also connected to the first power supply line 34.
  • FIG. 2 shows an exemplary embodiment of a preferred use of the signal detection device containing the sensor arrangement 24 and the evaluation circuit 25 in a cooling fan.
  • the Sensor arrangement 24 is in thermal contact with a cooler 41, the temperature of which can be detected with sensor 10 designed as a temperature sensor.
  • the evaluation circuit 25 is arranged in a housing 42 which corresponds to a housing of the electric motor 40.
  • the electric motor 40 drives a fan 43, which generates an air flow rate for the cooler 41.
  • the two power supply lines 34, 37 and the connecting line 22 lead to the housing 42, while the sensor arrangement 24 is connected to the connecting line 22 and to ground 23.
  • the signal detection device works as follows:
  • the sensor 10 outputs the analog signal 11 as a measure of the measured variable.
  • the sensor 10 is, for example, a temperature sensor which is thermally conductively connected to a housing (not shown in more detail) which accommodates the sensor arrangement 24. With this measure, it is possible to thermally contact the entire sensor arrangement 24 with a part, for example the cooler 41 shown in FIG. 2, instead of the sensor 10.
  • the analog signal 11 is converted into the digital signal 18 in the signal conversion 17.
  • the signal conversion 17 contains the first operational amplifier 13, which acts as a comparator and which compares the analog signal 11 at its first input 12 with the triangular voltage signal 16 at its second input 14, which the triangular voltage generator 15 provides.
  • the analog signal 11 can be regarded as the reference voltage for the delta voltage signal 16.
  • the digital signal emitted by the first operational amplifier 13 accordingly has a duty cycle which is dependent on the level of the analog signal 11, the fundamental frequency corresponding to the fundamental frequency of the delta voltage signal 16 generated by the delta voltage generator 15.
  • the analog signal 11 controls a voltage-dependent generator (VCO).
  • VCO outputs the digital signal 18 directly, the frequency being a measure of the level of the analog signal 11.
  • the digital signal 18 opens and closes the switching transistor 20 contained in the current sink 19.
  • the closed switching transistor 20 connects the ground 23 to the connecting line 22 via the limiter diode 21.
  • the connecting line 22 has the special feature that the energy required for the sensor arrangement 24 and the measured value signal detected by the sensor 10 are transmitted simultaneously.
  • the energy supply to the sensor arrangement 24 is ensured as long as the potential occurring in the connecting line 22 is higher than the minimum potential required by the energy supply circuit 26.
  • the power supply circuit 26 is, for example, a voltage stabilizing circuit which supplies the delta voltage generator 15 and the first operational amplifier 13 or a voltage-controlled oscillator (VCO), not shown, with a constant voltage.
  • the energy supply circuit 26 generates an output voltage of 5 V from an input voltage which is higher than, for example, 6 V.
  • the potential on the connecting line 22 must not drop below a potential of 6 V in this case.
  • the current required by the energy supply circuit 26, which corresponds to the operating current required to supply the sensor arrangement 24, can theoretically be calculated or can be determined experimentally.
  • the current flow additionally caused by the switched current sink 19, which also changes digitally between two discrete values in accordance with the digital signal 18, can be detected in the evaluation circuit 25 with simple means.
  • Both the operating current required for the energy supply of the sensor arrangement 24 and the current caused by the switched current sink 19 flow via the evaluation resistor 39, which is arranged in the evaluation circuit 25.
  • the voltage drop across the evaluation resistor 39 caused by the operating current of the sensor arrangement 24 is known and is not considered further. Only the current caused by the current sink 19, which leads to digital voltage changes at the evaluation stand 39, is used for the evaluation.
  • the evaluation resistor 39 is part of a voltage divider, the second part of which is the internal resistance of the sensor arrangement 24.
  • the limiter diode 21 contained in the current sink 19 has the task of limiting the potential occurring in the connecting line 22 when the switching transistor 20 is switched through to a value at which the energy supply of the sensor arrangement 24 is still ensured.
  • the potential in the connecting line 22 should not drop below 6 V.
  • a current source circuit can be provided which draws a current via the connecting line 22 which is independent of the potential.
  • a current mirror circuit can be provided instead of the evaluation resistor 39, which enables further independence from the potential conditions.
  • the current mirror circuit is, for example, in the specialist book U. TIETZE and CH. SCHENK, "Semiconductor Circuitry", 5th edition, Springer-Verlag, 1980, pages 55 and 56 explained in more detail, so that a detailed circuit description is not required here.
  • the current mirror circuit outputs an easily manageable analog voltage that is proportional to the current flowing through the current mirror circuit.
  • the voltage drop occurring at the evaluation resistor 39 is compared by the second operational amplifier 27 with the potential at the center tap 31, which the voltage divider provides from the two resistors 32, 33.
  • the potential at the center tap 31 is to be determined such that only the voltage drop caused by the switched current sink 19 enables the second operational amplifier 27, which acts as a comparator, to be switched.
  • the second operational amplifier 27 provides a signal that corresponds to the digital signal 18. In particular, a variable duty cycle and / or a variable frequency are reconstructed.
  • the second operational amplifier 27 can be provided directly for controlling the output stage circuit 28, which in the exemplary embodiment shown in FIG. 1 is implemented as a MOSFET.
  • the output stage circuit 28 switches the electric motor 40 in the exemplary embodiment shown.
  • a significant advantage of the signal detection device according to the invention in accordance with the exemplary embodiment shown in FIG. 1 is that the digital signal 18 occurring in the sensor arrangement 24 can be regarded as a pulse-width-modulated signal which can be used as a pulse-width-modulated control signal for the electric motor 40 without further changes. With the pulse-width modulated signal, clocked operation of the electric motor 40 is possible, which enables variable power output in a wide range in conjunction with a high degree of efficiency.
  • the energy for operating the electric motor 40 is provided by the energy source 36, which is, for example, a battery installed in a motor vehicle.
  • the exemplary embodiment shown in FIG. 2 of a use of the signal detection device according to the invention is based on a motor vehicle in which the electric motor 40 drives, for example, the fan 43, which generates an air flow for cooling the cooler 41.
  • the cooler 41 can be, for example, a cooler through which a coolant flow is provided and which is provided for operating an internal combustion engine.
  • the sensor arrangement 24 is mounted in thermal contact with the cooler 41.
  • the sensor 10 is preferably thermally coupled to a housing that houses the entire sensor arrangement 24. With this measure, a compact active sensor arrangement 24 is created which is to be connected to only two lines like a conventional sensor.
  • the evaluation circuit 25 is arranged in the housing 42, which corresponds to the housing of the electric motor 40.
  • a first advantage is the compact design, wherein the housing 42 can be contacted with only three lines. Another significant advantage is the reduction of any electromagnetic radiation that may be generated, which can occur in the output stage circuit 28 and in particular in the connecting lines to the electric motor 40.
  • the housing 42 therefore takes on not only the shielding of the electric motor 40, but also that of the output stage circuit 28 and other components.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Control Of Direct Current Motors (AREA)
EP94116768A 1993-11-24 1994-10-25 Dispositif d'acquisition de signaux Expired - Lifetime EP0654773B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE4339958 1993-11-24
DE4339958A DE4339958A1 (de) 1993-11-24 1993-11-24 Signalerfassungsvorrichtung

Publications (2)

Publication Number Publication Date
EP0654773A1 true EP0654773A1 (fr) 1995-05-24
EP0654773B1 EP0654773B1 (fr) 1999-09-15

Family

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Family Applications (1)

Application Number Title Priority Date Filing Date
EP94116768A Expired - Lifetime EP0654773B1 (fr) 1993-11-24 1994-10-25 Dispositif d'acquisition de signaux

Country Status (2)

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EP (1) EP0654773B1 (fr)
DE (2) DE4339958A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6293097B1 (en) 1999-08-16 2001-09-25 Ford Global Technologies, Inc. On-board reductant delivery system

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19703514A1 (de) * 1997-01-31 1998-08-06 Telefunken Microelectron Verfahren zur Einstellung des Widerstandswertes von Fotowiderständen
DE102005020870B4 (de) * 2005-02-10 2014-05-22 Continental Automotive Gmbh Sensorschaltung
DE102013202529B4 (de) * 2013-02-15 2020-03-12 Bayerische Motoren Werke Aktiengesellschaft Vorrichtung und Verfahren zum Abkühlen eines Antriebsmotors eines Kraftfahrzeugs mittels einer separaten Vorrichtung zum temporären Ansteuern des Motorlüfters und Versorgen des Motorlüfters mit elektrischer Energie

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2244677B1 (de) * 1972-09-12 1974-03-28 Hottinger Baldwin Messtechnik Gmbh, 6100 Darmstadt Anordnung zum elektrischen messen mechanischer groessen
FR2377611A1 (fr) * 1977-01-13 1978-08-11 Endress Hauser Gmbh Co Systeme de traitement de signaux de mesure
EP0084378A1 (fr) * 1982-01-19 1983-07-27 Nippondenso Co., Ltd. Dispositif de régulation du système de refroidissement pour un moteur
US4841296A (en) * 1986-01-31 1989-06-20 Yamatake-Honeywell Co. Ltd. Two-wire transmitter
JPH037092A (ja) * 1989-05-31 1991-01-14 Nippon Densan Corp モータ制御方法

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4190822A (en) * 1978-04-05 1980-02-26 Honeywell Inc. Current telemetering interface apparatus
DE3013474A1 (de) * 1980-04-08 1981-10-15 Licentia Patent-Verwaltungs-Gmbh, 6000 Frankfurt Sensorsystem
JPS58112822A (ja) * 1981-12-26 1983-07-05 Toyota Central Res & Dev Lab Inc 自動車用フアンコントロ−ラ

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2244677B1 (de) * 1972-09-12 1974-03-28 Hottinger Baldwin Messtechnik Gmbh, 6100 Darmstadt Anordnung zum elektrischen messen mechanischer groessen
FR2377611A1 (fr) * 1977-01-13 1978-08-11 Endress Hauser Gmbh Co Systeme de traitement de signaux de mesure
EP0084378A1 (fr) * 1982-01-19 1983-07-27 Nippondenso Co., Ltd. Dispositif de régulation du système de refroidissement pour un moteur
US4841296A (en) * 1986-01-31 1989-06-20 Yamatake-Honeywell Co. Ltd. Two-wire transmitter
JPH037092A (ja) * 1989-05-31 1991-01-14 Nippon Densan Corp モータ制御方法

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
PATENT ABSTRACTS OF JAPAN vol. 15, no. 118 (E - 1048) 22 March 1991 (1991-03-22) *

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6293097B1 (en) 1999-08-16 2001-09-25 Ford Global Technologies, Inc. On-board reductant delivery system

Also Published As

Publication number Publication date
EP0654773B1 (fr) 1999-09-15
DE59408743D1 (de) 1999-10-21
DE4339958A1 (de) 1995-06-01

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