WO1992000504A1 - Device for reliably detecting faults and suppressing noise peaks in potentiometer assessment - Google Patents

Device for reliably detecting faults and suppressing noise peaks in potentiometer assessment

Info

Publication number
WO1992000504A1
WO1992000504A1 PCT/DE1991/000473 DE9100473W WO9200504A1 WO 1992000504 A1 WO1992000504 A1 WO 1992000504A1 DE 9100473 W DE9100473 W DE 9100473W WO 9200504 A1 WO9200504 A1 WO 9200504A1
Authority
WO
Grant status
Application
Patent type
Prior art keywords
potentiometer
device according
characterized
filter
resistor
Prior art date
Application number
PCT/DE1991/000473
Other languages
German (de)
French (fr)
Inventor
Helmut Denz
Original Assignee
Robert Bosch Gmbh
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

Links

Classifications

    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02DCONTROLLING COMBUSTION ENGINES
    • F02D11/00Arrangements for, or adaptations to, non-automatic engine control initiation means, e.g. operator initiated
    • F02D11/06Arrangements for, or adaptations to, non-automatic engine control initiation means, e.g. operator initiated characterised by non-mechanical control linkages, e.g. fluid control linkages or by control linkages with power drive or assistance
    • F02D11/10Arrangements for, or adaptations to, non-automatic engine control initiation means, e.g. operator initiated characterised by non-mechanical control linkages, e.g. fluid control linkages or by control linkages with power drive or assistance of the electric type
    • F02D11/107Safety-related aspects
    • GPHYSICS
    • G01MEASURING; TESTING
    • G01DMEASURING 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
    • G01D5/00Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable
    • G01D5/12Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable using electric or magnetic means
    • G01D5/14Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable using electric or magnetic means influencing the magnitude of a current or voltage
    • G01D5/16Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable using electric or magnetic means influencing the magnitude of a current or voltage by varying resistance
    • G01D5/165Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable using electric or magnetic means influencing the magnitude of a current or voltage by varying resistance by relative movement of a point of contact or actuation and a resistive track
    • GPHYSICS
    • G01MEASURING; TESTING
    • G01RMEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R27/00Arrangements for measuring resistance, reactance, impedance, or electric characteristics derived therefrom
    • G01R27/02Measuring real or complex resistance, reactance, impedance, or other two-pole characteristics derived therefrom, e.g. time constant
    • G01R27/16Measuring impedance of element or network through which a current is passing from another source, e.g. cable, power line
    • GPHYSICS
    • G01MEASURING; TESTING
    • G01RMEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R31/00Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
    • G01R31/02Testing of electric apparatus, lines or components, for short-circuits, discontinuities, leakage of current, or incorrect line connection
    • G01R31/024Arrangements for indicating continuity or short-circuits in electric apparatus or lines, leakage or ground faults
    • G01R31/026Testing continuity

Abstract

The invention relates to a device for reliably detecting faults and suppressing noise peaks in potentiometer assessment in which the signal output of the potentiometer is connected to a voltage higher than the reference voltage via a pull-up resistor (19) so that when the signal line is interrupted there is, at the next analog-digital converter (13), a higher potential compared with that of smooth operation which is used to detect faults. If the circuit is suitably designed, the wiper current of the potentiometer is kept to a minimum and the effects of noise peaks or micro-interruptions are reduced.

Description

Device for secure failure detection and Rauschspitzenunter- drückuncr at a Potentiometerauswertunq

State of the art

The invention relates to a device for safe exemplary llerken¬ voltage and noise peak suppression in a Potentiometerauswer¬ tung, in particular with a throttle valve in an internal combustion engine.

It is well known in the art, the position Drosselklappen¬ from which the amount of intake air to the engine is dependent to determine with the aid of a throttle valve. Da¬ at represents the throttle valve is a mechanically verän¬ derbaren resistance, on the grinder, the signal voltage is gripped ab¬.

The tapped signal voltage is within narrow tolerances lie¬ gen and the grinders streams should be in order to best noise reduction as small as possible (<20 .UA). Further, an error detection for short circuits and cable drop across the potentiometer terminals is er¬ conducive. A monitoring device for the throttle valve is known from DE-OS 37 14 697th Here, the Drosselklappenpoten¬ is tiometer, the wiper position is in a predetermined relationship to the position of the accelerator pedal, on the one hand via a measuring resistor to the operating voltage and on the other hand angeschlos¬ sen to ground. For the detection of unwanted shunt resistors, which can occur particularly in the aged state of the potentiometer and to an increased current through the potentiometer and the resistance Meßwert¬ lead occurring at the measuring resistor is measured Spannungs¬ waste. In case of deviation from a predetermined value, a shunt resistor is detected.

However with this monitoring device for a Drosselklappenpotentio¬ meter it is not possible to detect a failure of the potentiometer yourself or a cable break at the wiper terminal of the potentiometer. In addition, noise spikes that can th auftre¬ in short-term resistance increases or even interruptions at the wiper can cause malfunctions. heightening these brief Widerstandser- occur especially in an aged potentiometer, fall in the abrasion carbon particles under the grinder.

The invention is based on the object fen to schaf¬ means, on the one hand, a failure of the potentiometer or a cable break at the wiper terminal of the potentiometer is detected with the in the evaluation of output signals of a potentiometer arrangement and on the other hand, the effect of noise spikes on the output signal of the potentiometer arrangement the can lead to errors can be suppressed in the best possible. Advantages of the Invention

The inventive device has the advantage that a missing output signal of the potentiometer bwz. a cable break at Schlei¬ feranschluß the potentiometer despite low Potentiometerstrom in normal operation is reliably detected.

NEN noise spikes that occur when abrasion of the potentiometer kön¬, can-be suppressed better, and by suitable choice of a filter on an impact at the analog-to-digital converter gehin¬ be changed.

By a unique hardware-based fault detection costly and questionable plausibility checks of the software are unnecessary.

Advantageous developments and improvements of erfindungsgemä¬ SEN device are specified in the dependent claims.

drawing

1 shows a schematic diagram of a conventional evaluation circuit for a ratiometric unevaluated Drosselklappenpoten¬ tiometer, in Figure 2 a device according to the invention to si¬ Cheren failure detection and noise peak suppression on a throttle indicated selklappenpotentiometer

Description of the embodiment

In the circuit of Figure 1 in the throttle position sensor DKG a throttle valve 10 between the buffered polyvinyl sitive supply voltage U, which is 5 volts, and ground. In sander S of the throttle valve 10 may be a momentarily occurring noise resistance is present, which is shown as a resistor. 11 Furthermore, in Drosselklap¬ pengeber DKG a protective resistor 18, whose value is approx 800 ohms be¬, downstream of the slider S, the other terminal of the protective resistor 18 leads to the output A of the throttle sensor DKG and connected to a corresponding terminal of the control unit SG is.

_The terminal of the control unit SG in question is resistant over a Filter¬ 12 to a likewise lying between supply voltage and ground analog-to-digital converter 13 is connected. Between the input of the analog-to-digital converter 13 and a mass Fil¬ is terkondensator 14, at the input of the control unit SG is a pull-down resistor 15, which is connected to ground and to Poten¬ tialdefinition used in a cable waste.

Furthermore, a protection circuit consisting of the zener diodes 23 and 24, arranged so at the input of the analog-to-digital converter 13 that it against excessive positive or negative Spannungsspit¬ protects this zen.

The analog to digital converter 13 is tung in Figure 1 by a Ersatzschal¬ formed of a resistor 16 and a lie at terminal 17 voltage of 2.5 volts, is shown.

Between the slider S of the throttle valve 10 and ground the Drosselklappenpotentiometerspannung is U, through the wiper contact S the voltage flows as the output of Drosselklappen¬ potentiometers, the current I .. At the pull-down resistor 15 is the voltage U and the filter capacitor 14 U. Depending on the voltage U flows in the analog-digital converter 13

Current I ^ "of about +1 to -1 uA, uA and in the ADW to protective / / tung with the Zener diodes 23 and 24, a current of about +2 to uA

- 2 uA. The sum of both streams is denoted by I. / SU

The throttle valve 10 is in normal operation zwi¬ rule of buffered supply voltage U and ground. The Poten¬ tiometerspannung U varies depending on the position of the throttle-flap. The characteristic is usually carried out so that U reaches a maximum of 4.8 volts and a minimum of 0.2 volts so that an implausible area for various types of errors Leitungskurz¬ circuits or interruptions is available.

With aging of the potentiometer in the sliding-contact resistance to abrasion resistance path extending especially in Be¬ movement of the slider abruptly enlarge. In particular with large current I, a high voltage drop at the input of the RC element 12, 14 occurs by the voltage drop across the short time ver¬ größerten noise resistance 18th The time constant of this RC element 12, 14 can only be chosen so large that no significant delay of the useful signal fers results at the fastest change of Potentiometerschlei¬ in normal operation. For example, a filter zeitkonstanteTT is realized = 5 ms with a resistor 12 and a capacitor KOH _ 12 14 440 Nannofarad.

Thus the least possible error effect on the analog digi tal converter 13 is formed, the current I must be selected as small as possible, so that the voltage drop as small as possible wwiirrdd .. TThhee ffoollggeennddee BBeettrraacchhttuunngg zzeeiiggtt jjeeddeoch that I having a circuit of Figure 1 is relatively large. To detect the drop cable at the output A of the throttle sensor, the resistor 15 has to lower the potential extent that adjusts an implausible low potential of, for example, 0.1 volts at the input of the analog-to-digital converter. 13 By the current of the Zener diode 23 of the protective circuit and analog-to-digital converter 13, the composite I = - should be 3 mA, a Spannungs¬ occurs on falling across the resistors 12 and 15 °. To ensure that this remains less than 0.1 volts, the total resistance of the two resistors 12 and 15 must be less than 33 KOhm be, with a value of 12 K ohms for resistor 12 resistor 15 must be smaller than 21 KOhm. However, this results in normal operation, a high current I grinder of 220 uA at the upper tap of the slider path, this leads to strong voltage dips Span¬ in the above-mentioned increase in the noise resistance. 11

Figure 2 shows a circuit arrangement with which an improved noise peak suppression while maintaining the failure detection is possible for the potentiometer measurement.

The throttle valve 10 is connected as shown in Figure 1 to a buffered reference voltage U, as well as to ground. The output A of the throttle sensor is DKG ge over a PUL1-up resistor 19 to a voltage higher than U sets, for example, 8 volts for V = 5 volts. The higher voltage is Span¬ is via a series resistor 20, the voltage terminal connected to a Batteriespan¬ 21 and a Zener diode 22, which is located between the resistor 20 and ground, is generated.

In a simplified embodiment of the pull-up resistor 19 may also be placed directly on the battery voltage, are thus connected directly to the battery voltage terminal 21st The input circuit of the circuit of Figure 2, or the configuration of the Drosselklappenpotentiometergebers DKG ent speaks the already known from the figure 1 arrangement.

A calculation of the circuit of Figure 2 shows the parts of Figure 1 Vor¬ over circuits. To detect the fault "Kabel¬ drop at the output A of the throttle sensor DKG", the potential at the analog-to-digital converter input must be raised above a threshold of about 4.9 volts. In this case, the sum can stream of analog-to-digital converter 13 and protective circuit (Zener¬ diode 24) I = + 3 mA are accepted. The voltage drop across the resistors bU 19 and 22 must not exceed 8 volts - 4.9 volts = 3.1 volts amount. Thus, the total value of the resistors can be 19 + 12 1 MOhm. Since the value of resistor 12 is 12 Kohms, it is against the value of the resistor 19 is negligibly small, nähe¬ approximately true that about 1 MOhm the value of resistor 19 must betra¬ gen.

In normal operation, there is the largest wiper current at the bottom

Tap the slider track for U 0 volts. About the pull-up resistance 19 then flows the current I = 7.8 volts x 1 MOhm <8 uA,

Pu with the proviso that the resistor 18 is much smaller than the resistance of the nineteenth The total current of analog-to-digital converter 13 and is Schutzbe¬ circuit (zener diode 23 and zener diode 24): I - 3 uA.

SU

The resulting wiper current on Throttle be¬ therefore carries a maximum of I = - 12 uA.

So with this wiring, a diagnostic capability is possible at about 20 times lower load current or slider current I as in the known arrangement of Figure 1. The effect of noise spikes, that the voltage drop by increasing Rll is thus also about 20 times less than a circuit arrangement of Figure 1. the input filter in addition to the previously described simple RC member 12, 14, another filter may be used. Insbeson particular from the junction of resistor 19 and resistor 12, an additional capacitor 30 may be right at the entrance, switched to ground ge and thus the time constant of the RC member 12, 14 verklei¬ nert.

In short-term high noise resistance, so if the value of the Wi¬ DERS tandes 11 approaches infinity, thus a high discharge will have time constant on the high-value resistor 19 which be¬ indicated that the target voltage is maintained for long.

the noise resistance disappears, so will the resistance 11 to zero, then this very small charging time via the low-resistance 18 acts on the setpoint U.

The circuits shown in Figures 1 and 2 can be used selbst¬ understood to other Potentiometerauswertungen as selklappenpotentiometerauswertungen for Dros¬. As an example, an air flow meter, which also holds a potentiometer ent indicated.

Claims

claims
1. A device for safe failure detection and Rauschspitzenunter¬ suppression at a potentiometer measurement at which the Potentio¬ meter between a reference voltage and ground is switched and the tapped at the wiper terminal of the potentiometer signal via a signal path to an analog-to-digital converter is fed, da¬ by in that a comparison with the reference voltage
(U) increased voltage (U) over a PUL1-uρ resistor (19) is supplied to the terminal S of the potentiometer wiper (10).
2. Device according to claim 1, characterized in that between the wiper terminal S of the potentiometer (10) and the analog-Digi¬ tal converter (13), a filter (12, 14).
3. A device according to claim 2, 'characterized in that the Fil¬ ter (12, 14) is an RC filter.
4. Device according to claim 2 or 3, characterized in that the dimensioning of the filter (12, 14) is made such that when the fastest possible change of the tapped at the wiper S signal by the filter (12, 14) auf¬ no further time delay occurs.
5. Device according to one of the preceding claims characterized ge that the potentiometer 10 is a Drosselklappenpotentio¬ meter or a potentiometer is an air flow meter.
6. Device according to one of the preceding claims characterized ge that the pull-up resistor (19) has a high impedance.
7. Device according to one of claims 1 to 6, gekenn¬ characterized characterized that for a interruption of the signal path between the potentiometer (10) and analog-to-digital converter (13), in particular at the output A of the potentiometer (10), the potential at the Ana¬ input of log-digital converter (13) by a value that in the undisturbed operating Be¬ is possible increases and a detection of the interruption er¬ made possible.
8. Device according to one of the preceding claims characterized ge that the dimensioning of the filter (12, 14) and the pull-up resistor (19) is performed so that the allowable duration of spike noise is as large as possible.
9. Device according to one of the preceding claims characterized ge that an additional filter capacitor (30) from the Ein¬ gear is connected to ground.
PCT/DE1991/000473 1990-06-23 1991-06-05 Device for reliably detecting faults and suppressing noise peaks in potentiometer assessment WO1992000504A1 (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
DE19904020106 DE4020106C2 (en) 1990-06-23 1990-06-23 Device for secure failure detection and noise peak suppression at a potentiometer measurement
DEP4020106.6 1990-06-23

Publications (1)

Publication Number Publication Date
WO1992000504A1 true true WO1992000504A1 (en) 1992-01-09

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Application Number Title Priority Date Filing Date
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Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2735871A1 (en) * 1995-06-23 1996-12-27 Renault Diagnostic method for detecting connection and wiring faults in automobile potentiometers
EP0759558A2 (en) * 1995-08-18 1997-02-26 Siemens Aktiengesellschaft Testing method for an analog input channel of an analog signal detecting circuit and the corresponding analog signal detecting circuit
DE19818315C1 (en) * 1998-04-23 1999-09-16 Siemens Ag Radiometric sensor signal measuring device
DE19833413A1 (en) * 1998-07-24 2000-02-10 Siemens Ag Potentiometric sensor read-out circuit e.g. for motor vehicle IC engine accelerator pedal
DE19905071A1 (en) * 1999-02-08 2000-08-10 Siemens Ag Transmitter and method for diagnosing the supply of a transmitter
US6580277B1 (en) 1998-04-23 2003-06-17 Siemens Aktiengesellschaft Device for the ratiometric measurement of sensor signals
US6990967B2 (en) 2003-08-28 2006-01-31 Pierburg Gmbh Potentiometer device for determination of valve positions
EP2602695A1 (en) * 2011-12-09 2013-06-12 Thales Data input device with potentiometer and control stick for piloting an aircraft, the control stick including the data input device

Families Citing this family (8)

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Publication number Priority date Publication date Assignee Title
DE4204623C2 (en) * 1992-02-15 1993-11-25 Bosch Gmbh Robert Means for detecting a variable size in vehicles
DE19728596C2 (en) * 1997-07-04 2000-02-17 Bosch Gmbh Robert A method for monitoring a potentiometer
DE19949623C1 (en) * 1999-10-14 2001-05-10 Asm Automation Sensorik Messte Electrical noisy transmitter for potentiometers and methods for increasing immunity
JP3918614B2 (en) * 2002-04-09 2007-05-23 富士電機デバイステクノロジー株式会社 Disconnection failure detection circuit
DE102004021620A1 (en) * 2004-05-03 2005-12-08 Jungheinrich Aktiengesellschaft Steering angle detector for industrial truck has two potentiometers with differing nominal resistances producing opposing output signals
DE102004035945B3 (en) 2004-07-23 2006-04-06 Samson Ag Monitoring circuit for variable resistor with sliding contact has resistor connected between two variable resistors connected in series between reference voltage and earth
US8154305B2 (en) * 2010-07-16 2012-04-10 General Electric Company Systems, methods, and apparatus for connection fault self-monitoring with DC bias current
FR2973883B1 (en) * 2011-04-05 2013-05-10 Sagem Defense Securite Method and system for detecting a short circuit affecting one sensor

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EP0274767A1 (en) * 1986-10-07 1988-07-20 Philips Patentverwaltung GmbH Method and circuit for determining the pick-off position of a remotely controlled resistance transmitter

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FR2197179A1 (en) * 1972-08-21 1974-03-22 Motoda Electronics
FR2441852A1 (en) * 1978-11-16 1980-06-13 Beckman Instruments Inc Digital ohmmeter with electrical continuity checker
JPS6357851A (en) * 1986-08-29 1988-03-12 Japan Electronic Control Syst Co Ltd Detecting device for throttle valve opening
EP0274767A1 (en) * 1986-10-07 1988-07-20 Philips Patentverwaltung GmbH Method and circuit for determining the pick-off position of a remotely controlled resistance transmitter

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PATENT ABSTRACTS OF JAPAN vol. 12, no. 274 (M-725)(3121) 29. Juli 1988 & JP-A-63 57 851 (JAPAN ELECTRONIC CONTROL SYST CO LTD ) 12. März 1988 siehe das ganze Dokument *

Cited By (15)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2735871A1 (en) * 1995-06-23 1996-12-27 Renault Diagnostic method for detecting connection and wiring faults in automobile potentiometers
EP0759558A3 (en) * 1995-08-18 1997-10-01 Siemens Ag Testing method for an analog input channel of an analog signal detecting circuit and the corresponding analog signal detecting circuit
EP0759558A2 (en) * 1995-08-18 1997-02-26 Siemens Aktiengesellschaft Testing method for an analog input channel of an analog signal detecting circuit and the corresponding analog signal detecting circuit
US6580277B1 (en) 1998-04-23 2003-06-17 Siemens Aktiengesellschaft Device for the ratiometric measurement of sensor signals
DE19818315C1 (en) * 1998-04-23 1999-09-16 Siemens Ag Radiometric sensor signal measuring device
WO1999056084A2 (en) * 1998-04-23 1999-11-04 Siemens Aktiengesellschaft Device for radiometric sensor signal measurement
WO1999056084A3 (en) * 1998-04-23 2000-02-24 Siemens Ag Device for radiometric sensor signal measurement
US6496772B1 (en) 1998-04-23 2002-12-17 Siemens Aktiengesellschaft Device for radiometric sensor signal measurement
DE19833413A1 (en) * 1998-07-24 2000-02-10 Siemens Ag Potentiometric sensor read-out circuit e.g. for motor vehicle IC engine accelerator pedal
DE19833413C2 (en) * 1998-07-24 2001-07-12 Siemens Ag A method of reading at least a potentiometric sensor
DE19905071A1 (en) * 1999-02-08 2000-08-10 Siemens Ag Transmitter and method for diagnosing the supply of a transmitter
US6990967B2 (en) 2003-08-28 2006-01-31 Pierburg Gmbh Potentiometer device for determination of valve positions
EP2602695A1 (en) * 2011-12-09 2013-06-12 Thales Data input device with potentiometer and control stick for piloting an aircraft, the control stick including the data input device
FR2983987A1 (en) * 2011-12-09 2013-06-14 Thales Sa Device for data input potentiometer and handle for the piloting of an aircraft, the handle comprising the data input device
US9188614B2 (en) 2011-12-09 2015-11-17 Thales Data input device with a potentiometer, and joystick intended for piloting an aircraft, said joystick comprising the data input device

Also Published As

Publication number Publication date Type
DE4020106A1 (en) 1992-01-02 application
DE4020106C2 (en) 1999-12-09 grant

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