DE102011077813A1 - Circuit device for monitoring deviation of e.g. power signal of sensor of motor car brake control apparatus, has detector evaluating input signals, and subtractor subtracting local minima from local maxima to calculate signal deviation - Google Patents
Circuit device for monitoring deviation of e.g. power signal of sensor of motor car brake control apparatus, has detector evaluating input signals, and subtractor subtracting local minima from local maxima to calculate signal deviation Download PDFInfo
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- DE102011077813A1 DE102011077813A1 DE102011077813A DE102011077813A DE102011077813A1 DE 102011077813 A1 DE102011077813 A1 DE 102011077813A1 DE 102011077813 A DE102011077813 A DE 102011077813A DE 102011077813 A DE102011077813 A DE 102011077813A DE 102011077813 A1 DE102011077813 A1 DE 102011077813A1
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- signal
- sensor
- local
- maxima
- circuit arrangement
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- 238000012544 monitoring process Methods 0.000 title claims description 5
- 230000001133 acceleration Effects 0.000 claims 1
- 238000001514 detection method Methods 0.000 description 10
- 230000007797 corrosion Effects 0.000 description 2
- 238000005260 corrosion Methods 0.000 description 2
- 238000011156 evaluation Methods 0.000 description 2
- 230000003679 aging effect Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000000246 remedial effect Effects 0.000 description 1
- 230000011664 signaling Effects 0.000 description 1
Images
Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60T—VEHICLE BRAKE CONTROL SYSTEMS OR PARTS THEREOF; BRAKE CONTROL SYSTEMS OR PARTS THEREOF, IN GENERAL; ARRANGEMENT OF BRAKING ELEMENTS ON VEHICLES IN GENERAL; PORTABLE DEVICES FOR PREVENTING UNWANTED MOVEMENT OF VEHICLES; VEHICLE MODIFICATIONS TO FACILITATE COOLING OF BRAKES
- B60T8/00—Arrangements for adjusting wheel-braking force to meet varying vehicular or ground-surface conditions, e.g. limiting or varying distribution of braking force
- B60T8/32—Arrangements for adjusting wheel-braking force to meet varying vehicular or ground-surface conditions, e.g. limiting or varying distribution of braking force responsive to a speed condition, e.g. acceleration or deceleration
- B60T8/88—Arrangements for adjusting wheel-braking force to meet varying vehicular or ground-surface conditions, e.g. limiting or varying distribution of braking force responsive to a speed condition, e.g. acceleration or deceleration with failure responsive means, i.e. means for detecting and indicating faulty operation of the speed responsive control means
- B60T8/885—Arrangements for adjusting wheel-braking force to meet varying vehicular or ground-surface conditions, e.g. limiting or varying distribution of braking force responsive to a speed condition, e.g. acceleration or deceleration with failure responsive means, i.e. means for detecting and indicating faulty operation of the speed responsive control means using electrical circuitry
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60T—VEHICLE BRAKE CONTROL SYSTEMS OR PARTS THEREOF; BRAKE CONTROL SYSTEMS OR PARTS THEREOF, IN GENERAL; ARRANGEMENT OF BRAKING ELEMENTS ON VEHICLES IN GENERAL; PORTABLE DEVICES FOR PREVENTING UNWANTED MOVEMENT OF VEHICLES; VEHICLE MODIFICATIONS TO FACILITATE COOLING OF BRAKES
- B60T8/00—Arrangements for adjusting wheel-braking force to meet varying vehicular or ground-surface conditions, e.g. limiting or varying distribution of braking force
- B60T8/17—Using electrical or electronic regulation means to control braking
- B60T8/171—Detecting parameters used in the regulation; Measuring values used in the regulation
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L25/00—Baseband systems
- H04L25/02—Details ; arrangements for supplying electrical power along data transmission lines
- H04L25/0264—Arrangements for coupling to transmission lines
- H04L25/028—Arrangements specific to the transmitter end
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60T—VEHICLE BRAKE CONTROL SYSTEMS OR PARTS THEREOF; BRAKE CONTROL SYSTEMS OR PARTS THEREOF, IN GENERAL; ARRANGEMENT OF BRAKING ELEMENTS ON VEHICLES IN GENERAL; PORTABLE DEVICES FOR PREVENTING UNWANTED MOVEMENT OF VEHICLES; VEHICLE MODIFICATIONS TO FACILITATE COOLING OF BRAKES
- B60T2270/00—Further aspects of brake control systems not otherwise provided for
- B60T2270/40—Failsafe aspects of brake control systems
- B60T2270/406—Test-mode; Self-diagnosis
Abstract
Description
Die Erfindung betrifft eine Schaltungsanordnung zur Signalhubüberwachung eines zugeführten Signals gemäß Oberbegriff von Anspruch 1 sowie deren Verwendung gemäß Anspruch 7.The invention relates to a circuit arrangement for Signalhubüberwachung a supplied signal according to the preamble of claim 1 and the use thereof according to claim 7.
Heute gängige Kraftfahrzeugraddrehzahlsensoren für elektronische Bremsregelungssysteme (ABS, ESC) sind häufig sogenannte Aktivsensoren, welche das erfasste Raddrehzahlsignal in Form von Stromimpulsen an das Steuergerät des Bremsregelungssystems überträgt. Die Stromübertragung hat den Vorteil, dass sie hinsichtlich den in Kraftfahrzeugen vorherrschenden schwierigen Umweltbedingungen besonders betriebssicher ist. Der Pegel des Ausgangssignals des Raddrehzahlsensors kann sich z.B. durch hohe Leitungswiderstände, die durch Alterungseffekte auf Grund von Korrosion herrühren, oder Bordnetzschwankungen verändern. Im Bremsensteuergerät sind zur Auswertung der Impulssignale des Sensors häufig mehrere Erkennungsschwellen vorgesehen, mit denen durch Auswertung der Schwellenüberschreitung oder – unterschreitung detektiert wird, ob ein Impuls vorliegt. Die Anzahl der Schwellen ist so gewählt, dass in einem gewissen Toleranzband auch bei Signalschwankungen eine Impulserfassung möglich ist. Liegt bei einem Impuls der Signalpegel aber noch unterhalb der tiefsten, noch zur Erkennung eines Impulses im Steuergerät vorgegebenen Schwelle, so ist keine Impulserkennung möglich.Today common motor vehicle speed sensors for electronic brake control systems (ABS, ESC) are often called active sensors, which transmits the detected wheel speed signal in the form of current pulses to the control unit of the brake control system. The power transmission has the advantage that it is particularly reliable in terms of the prevailing in motor vehicles difficult environmental conditions. The level of the output of the wheel speed sensor may be e.g. due to high line resistance resulting from aging effects due to corrosion, or change vehicle electrical system fluctuations. In the brake control unit, a plurality of detection thresholds are frequently provided for evaluating the pulse signals of the sensor, by means of which detection of the threshold overshoot or undershoot detects whether a pulse is present. The number of thresholds is chosen so that in a certain tolerance band even with signal fluctuations, a pulse detection is possible. If, however, the signal level is still below the lowest threshold yet predetermined for the detection of a pulse in the control unit, pulse detection is not possible.
Die Aufgabe der vorliegenden Erfindung besteht nun darin, eine Auswerteschaltung in einem Kraftfahrzeugsteuergerät dahingehend zu verbessern, dass auch bei einer an sich noch ausreichenden Sensorsignalqualität eine Erfassung von Impulsen auch dann möglich ist, wenn der Absolutpegel des Signals für die Impulserkennung zu niedrig ist.The object of the present invention is now to improve an evaluation circuit in a motor vehicle control unit to the effect that even with a still sufficient sensor signal quality detection of pulses is possible even if the absolute level of the signal for the pulse detection is too low.
Diese Aufgabe wird erfindungsgemäß gelöst durch die Schaltungsanordnung gemäß Anspruch 1.This object is achieved by the circuit arrangement according to claim 1.
Die erfindungsgemäße Schaltungsanordnung erkennt vorteilhafterweise den Signalhub und legt die Erkennungsschwellen in Abhängigkeit von den erkannten Extremwerten des ausgewerteten Signals fest. Hierdurch können Sensorsignale auch dann noch ausgewertet werden, wenn sich das Signal toleranzbedingt oder korrosionsbedingt so weit abgeschwächt hat, dass eine Erkennung mit den üblicherweise vorgesehenen festen Schwellen nicht mehr möglich ist. Hierdurch ergeben sich speziell in einem Kraftfahrzeugsteuergerät erheblich Vorteile hinsichtlich der Sensorsignalverfügbarkeit.The circuit arrangement according to the invention advantageously detects the signal swing and determines the detection thresholds as a function of the detected extreme values of the evaluated signal. As a result, sensor signals can still be evaluated even if the signal has weakened due to tolerances or corrosion so far that detection with the usually provided fixed thresholds is no longer possible. This results in particular in a motor vehicle control device considerably advantages in terms of the sensor signal availability.
Vorzugsweise wird durch die Schaltungsanordnung das Signal auf lokale Maxima und lokale Minima hin untersucht. Aus den lokalen Maxima und lokalen Minima wird der aktuelle Signalhub als Differenzsignal errechnet. Optionale Komparatoren erlauben die Erfassung zu großen oder zu geringen Signalhubes. Dies kann zur Fehlersignalisierung verwendet werden. The circuit is preferably used to examine the signal for local maxima and local minima. From the local maxima and local minima, the current signal deviation is calculated as a difference signal. Optional comparators allow the acquisition to large or too small signal lift. This can be used for error signaling.
Parallel dazu – aber nicht zwingend – kann der Signalhub verwendet werden um Detektionsschwellen abzuleiten oder nachzuführen.Parallel to this - but not necessarily - the signal swing can be used to derive or track detection thresholds.
Prinzipiell ist die Realisierung der erfindungsgemäßen Schaltungsanordnung mit analoger oder digitaler Schaltungstechnik möglich. Eine digitale Umsetzung des Konzeptes erscheint vorteilhaft.In principle, the realization of the circuit arrangement according to the invention with analog or digital circuit technology is possible. A digital implementation of the concept appears advantageous.
Weitere bevorzugte Ausführungsformen ergeben sich aus den Unteransprüchen und der nachfolgenden Beschreibung eines Ausführungsbeispiels an Hand von Figuren.Further preferred embodiments will become apparent from the subclaims and the following description of an embodiment with reference to figures.
Es zeigtIt shows
Die erfindungsgemäße Signalhubüberwachung umfasst einen Detektor für lokale Maxima
Die Statusausgänge
Zusätzlich umfasst die Schaltungsanordnung einen Schwellenwertschalter
Der Schwellenwertschalter
Prinzipiell ist die erfindungsgemäße Schaltungsanordnung mit leichten Abänderungen auch zur Auswertung von Sensorsignalen bei Sensoren mit mehreren Signalpegeln nutzbar. Zum Beispiel zur Auswertung von Signalen von Raddrehzahlsensoren, bei denen eine geringere Amplitude aufweisende Zusatzinformationen zwischen den Signalen übertragen werden, die die eigentliche Raddrehzahlinformation übertragen. Hierzu können nach einer beonders bevorzugten Ausführungsform der erfindungsgemäßen zusätzliche Schaltschwellen eingefügt werden. Pro Schaltschwelle ist dann der Schaltungsteil
Claims (9)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
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DE102011077813A DE102011077813A1 (en) | 2011-06-20 | 2011-06-20 | Circuit device for monitoring deviation of e.g. power signal of sensor of motor car brake control apparatus, has detector evaluating input signals, and subtractor subtracting local minima from local maxima to calculate signal deviation |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
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DE102011077813A DE102011077813A1 (en) | 2011-06-20 | 2011-06-20 | Circuit device for monitoring deviation of e.g. power signal of sensor of motor car brake control apparatus, has detector evaluating input signals, and subtractor subtracting local minima from local maxima to calculate signal deviation |
Publications (1)
Publication Number | Publication Date |
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DE102011077813A1 true DE102011077813A1 (en) | 2012-12-20 |
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DE102011077813A Withdrawn DE102011077813A1 (en) | 2011-06-20 | 2011-06-20 | Circuit device for monitoring deviation of e.g. power signal of sensor of motor car brake control apparatus, has detector evaluating input signals, and subtractor subtracting local minima from local maxima to calculate signal deviation |
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DE (1) | DE102011077813A1 (en) |
Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5049990A (en) * | 1989-07-21 | 1991-09-17 | Sony Corporation | Highly efficient coding apparatus |
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2011
- 2011-06-20 DE DE102011077813A patent/DE102011077813A1/en not_active Withdrawn
Patent Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5049990A (en) * | 1989-07-21 | 1991-09-17 | Sony Corporation | Highly efficient coding apparatus |
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R119 | Application deemed withdrawn, or ip right lapsed, due to non-payment of renewal fee |