WO2011048002A1 - Vorrichtung und verfahren zur diagnose eines abgassensors - Google Patents
Vorrichtung und verfahren zur diagnose eines abgassensors Download PDFInfo
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- WO2011048002A1 WO2011048002A1 PCT/EP2010/065397 EP2010065397W WO2011048002A1 WO 2011048002 A1 WO2011048002 A1 WO 2011048002A1 EP 2010065397 W EP2010065397 W EP 2010065397W WO 2011048002 A1 WO2011048002 A1 WO 2011048002A1
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D41/00—Electrical control of supply of combustible mixture or its constituents
- F02D41/02—Circuit arrangements for generating control signals
- F02D41/14—Introducing closed-loop corrections
- F02D41/1438—Introducing closed-loop corrections using means for determining characteristics of the combustion gases; Sensors therefor
- F02D41/1493—Details
- F02D41/1495—Detection of abnormalities in the air/fuel ratio feedback system
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D41/00—Electrical control of supply of combustible mixture or its constituents
- F02D41/02—Circuit arrangements for generating control signals
- F02D41/14—Introducing closed-loop corrections
- F02D41/1438—Introducing closed-loop corrections using means for determining characteristics of the combustion gases; Sensors therefor
- F02D41/1444—Introducing closed-loop corrections using means for determining characteristics of the combustion gases; Sensors therefor characterised by the characteristics of the combustion gases
- F02D41/1454—Introducing closed-loop corrections using means for determining characteristics of the combustion gases; Sensors therefor characterised by the characteristics of the combustion gases the characteristics being an oxygen content or concentration or the air-fuel ratio
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D41/00—Electrical control of supply of combustible mixture or its constituents
- F02D41/02—Circuit arrangements for generating control signals
- F02D41/14—Introducing closed-loop corrections
- F02D41/1438—Introducing closed-loop corrections using means for determining characteristics of the combustion gases; Sensors therefor
- F02D41/1444—Introducing closed-loop corrections using means for determining characteristics of the combustion gases; Sensors therefor characterised by the characteristics of the combustion gases
- F02D41/1454—Introducing closed-loop corrections using means for determining characteristics of the combustion gases; Sensors therefor characterised by the characteristics of the combustion gases the characteristics being an oxygen content or concentration or the air-fuel ratio
- F02D41/1456—Introducing closed-loop corrections using means for determining characteristics of the combustion gases; Sensors therefor characterised by the characteristics of the combustion gases the characteristics being an oxygen content or concentration or the air-fuel ratio with sensor output signal being linear or quasi-linear with the concentration of oxygen
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D41/00—Electrical control of supply of combustible mixture or its constituents
- F02D41/02—Circuit arrangements for generating control signals
- F02D41/14—Introducing closed-loop corrections
- F02D41/1438—Introducing closed-loop corrections using means for determining characteristics of the combustion gases; Sensors therefor
- F02D41/1477—Introducing closed-loop corrections using means for determining characteristics of the combustion gases; Sensors therefor characterised by the regulation circuit or part of it,(e.g. comparator, PI regulator, output)
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N27/00—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means
- G01N27/26—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating electrochemical variables; by using electrolysis or electrophoresis
- G01N27/416—Systems
- G01N27/417—Systems using cells, i.e. more than one cell and probes with solid electrolytes
- G01N27/4175—Calibrating or checking the analyser
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N27/00—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means
- G01N27/26—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating electrochemical variables; by using electrolysis or electrophoresis
- G01N27/416—Systems
- G01N27/417—Systems using cells, i.e. more than one cell and probes with solid electrolytes
- G01N27/419—Measuring voltages or currents with a combination of oxygen pumping cells and oxygen concentration cells
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D41/00—Electrical control of supply of combustible mixture or its constituents
- F02D41/20—Output circuits, e.g. for controlling currents in command coils
- F02D2041/2086—Output circuits, e.g. for controlling currents in command coils with means for detecting circuit failures
- F02D2041/2089—Output circuits, e.g. for controlling currents in command coils with means for detecting circuit failures detecting open circuits
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D41/00—Electrical control of supply of combustible mixture or its constituents
- F02D41/20—Output circuits, e.g. for controlling currents in command coils
- F02D2041/2086—Output circuits, e.g. for controlling currents in command coils with means for detecting circuit failures
- F02D2041/2093—Output circuits, e.g. for controlling currents in command coils with means for detecting circuit failures detecting short circuits
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D41/00—Electrical control of supply of combustible mixture or its constituents
- F02D41/22—Safety or indicating devices for abnormal conditions
- F02D41/222—Safety or indicating devices for abnormal conditions relating to the failure of sensors or parameter detection devices
Definitions
- the invention relates to a device and a method diagnosis of an exhaust gas sensor, in particular a linear oxygen probe, for an internal combustion engine.
- exhaust gas sensors are used to comply with statutory emission limits, the signal of which is used to control the emission of internal combustion engines.
- Frequently used exhaust gas sensors are so-called binary and linear lambda sensors as well as NOx sensors.
- These types of exhaust gas sensors each comprise a heated solid electrolyte of yttrium-stabilized zirconia ceramics (Zr0 2 ).
- Zr0 2 yttrium-stabilized zirconia ceramics
- heating of the ceramic is provided.
- the target temperature is either regulated to a predetermined value or pre-controlled depending on operating point.
- the base material zirconium dioxide has two essential properties:
- Zirconium oxide transported oxygen particles.
- a widespread design of linear exhaust gas sensors consists of an arrangement of two interconnected cells of the basic material zirconium dioxide. In one cell, the so-called Nernst cell, the above-mentioned property is used. In the other, second cell, which is referred to as a pump cell, the property mentioned above under 2. is utilized.
- An electronic control or control device connected to the exhaust gas sensor has the task of measuring the voltage value deviating from the 450 mV across the Nernst cell and initiating a suitable counterreaction in order to achieve the voltage of 450 mV again.
- the exhaust gas sensor thus represents a controlled system, which must be kept in the operating point by the connected drive device.
- Ceramic material since the measurement accuracy of the exhaust gas sensors is significantly dependent on the temperature.
- a common method for temperature measurement is the use of an alternating current signal that is temporarily or continuously switched to the sensor cells and is evaluated temporarily or continuously.
- the resulting AC voltage drop is measured via the probe cell.
- the cell impedance obtained provides an indirect measure of the temperature of the cell in question.
- the control of the cell voltage to 450 mV is usually stopped for a certain period of time to determine the resulting AC signal during this period.
- an AC voltage signal is superimposed on the DC-oriented Nernst cell signal and the DC voltage signal necessary for the regulation of the Nernst voltage is separated from the AC voltage signal required for the temperature control by a suitable analog filter circuit.
- Short circuits can be caused by unusual voltages at the respective Detect conclusions of the exhaust gas sensor by comparing the voltage applied there with predetermined upper or lower limits.
- the detection of interruptions is difficult and has hitherto been realized by complex plausibility checks on the output signals of the drive circuit for the exhaust gas sensor.
- Line interruptions can be detected, for example, based on measured internal resistances and pump currents or on the behavior of the control loops based thereon under suitable operating conditions of the motor.
- the invention provides a device for diagnosing an exhaust gas sensor, in particular a linear oxygen probe, for an internal combustion engine.
- the device comprises a first connection for connection to a first electrode of a first cell of the exhaust gas sensor, a second connection for connection to a second electrode of a second cell of the exhaust gas sensor, a third connection for connection to a junction of a second electrode of the first cell and a first electrode of the second cell of the exhaust gas sensor.
- the first cell is called a Nernst cell.
- the second cell constitutes the so-called pump cell.
- the apparatus further comprises a first power source coupled to the first port for generating a current and impressing the first current into the first cell, and a second power source connected to the first power source second terminal is coupled to generate a second current and impressing the second current in the second cell.
- the third terminal is held at a certain, constant or variable voltage, eg by being connected to a voltage source or to ground.
- the device according to the invention is characterized by a diagnostic means which is designed to coordinate the first and the second power source for generating the first and the second current, each having predetermined signs, and which at respective first and second currents at the first and / or. or second and / or third terminal adjacent first and / or second and / or third voltages and to relate their amounts to the coordinated currents, whereby line breaks and / or short circuits at the first and / or second and / or third terminal are detectable.
- a diagnostic means which is designed to coordinate the first and the second power source for generating the first and the second current, each having predetermined signs, and which at respective first and second currents at the first and / or. or second and / or third terminal adjacent first and / or second and / or third voltages and to relate their amounts to the coordinated currents, whereby line breaks and / or short circuits at the first and / or second and / or third terminal are detectable.
- the invention further provides a method for diagnosing an exhaust gas sensor, in particular a linear oxygen probe, for an internal combustion engine by a device of the type described above.
- the first and the second power source for generating the first and the second current each having predetermined sign coordinated controlled.
- the first and / or second and / or third voltages applied to the first and / or second and / or third terminals at respective first and second currents are detected and their magnitudes related to the coordinated currents, line breaks and / or short circuits at the first and / or second and / or third terminal to detect.
- the invention makes it possible to detect line interruptions without additional functional units in a drive circuit activating the exhaust gas sensor.
- the Exhaust gas sensor designed as a linear oxygen probe, so for the Nernst cell, an AC power source is provided for measuring the internal resistance.
- Another power source is necessary for the pumping cell to generate a pumping current.
- the two current sources can be used for the diagnosis according to the invention, ie the coordinated power generation, by being controlled in a coordinated manner by the diagnostic means provided according to the invention.
- the diagnosis of the exhaust gas sensor can be carried out very quickly.
- it is possible to detect symptoms that indicate a lead fault and require activation of the diagnosis. Another advantage is that it requires less time than is allowed by law.
- a real power source can drive its nominal current only when the voltage at the output of the power source is within a certain range. Typically, the current decreases as the voltage approaches one of the supply voltages of the power source. If a resistor is connected to the output of the current source and the resistance becomes too high, then the output voltage of the current source rises or falls in the direction of one of the supply voltages of the current source, whereby the amount of the current becomes small. If a positive and once a negative current is set at the current source, a high or a low resistance results in a high or a low output voltage, whereby a positive voltage results in a positive current and a negative voltage in the case of a negative current.
- the diagnostic means for detecting a line interruption at the third terminal is configured to (a) the voltages at the first and the second terminal at positive first current and positive second current, (b) the voltages at the first and the second terminal at negative first current and negative second current, (c) the voltages at the first and second terminals at positive first current and negative second current, and (d) the voltages at the first and second terminals at negative first current and positive second current detect.
- the diagnosis means for detecting a line interruption at the third terminal is designed to generate the first current in the case (c) smaller in magnitude than the second current, and in the case (d) to produce the first current smaller in magnitude than the second current.
- the principle can also be applied if, in these cases, the first current is greater in magnitude than the second current.
- the diagnostic means for detecting a line interruption at the third connection is designed for this, in the case (a) at the first connection and in the case of (b) at the first terminal and the second terminal, respectively, a low voltage, in the case (c) at the first terminal and the second terminal, respectively, a low voltage, and in the case (i ) to detect a high voltage at the first terminal and the second terminal, respectively.
- a high voltage is understood as meaning a voltage which is close to the upper supply voltage of the respective power source.
- a low voltage is understood to be a voltage that is close to the lower supply voltage of the respective power source.
- an exhaust gas measurement is interrupted during the generation of the first and / or second current for determining a line interruption and / or a short circuit by the diagnostic means.
- the diagnosis requires the impressing of certain currents in the first and second cell of the exhaust gas sensor. It therefore makes the shutdown of the normally active pumping current control (in the case of a linear exhaust gas probe) necessary. Meanwhile, no lambda measurement can be made.
- the interruption of the lambda measurement is not critical since the basic presence of a line error leads to typical symptoms. For example, too high a resistance is measured or the pumping current regulator runs into a limit.
- an activation of the diagnostic agent is only provided if the presence of a fault of the exhaust gas sensor has been detected by an error detection means. The diagnostic means ultimately serves to pinpoint the error accurately.
- the diagnostic means comprises a first signal filter which is connected to the first and the third terminal and by which a first amplitude of the cell voltage of the first cell resulting from the first current can be determined and / or that to the second and third Connection is connected and a second amplitude resulting from the second current of the cell voltage of the second cell can be determined.
- the first signal filter is switchable between the first and third terminals and the second and third terminals.
- the diagnostic means comprises a first arithmetic unit for determining an average value of the cell voltage of the first cell.
- the internal resistance measurement impresses an alternating current into the first cell (in the case of a linear exhaust gas probe into the Nernst cell). This means that the internal resistance measurement generates positive and negative first currents.
- the signal filter coupled to the first and third terminals determines the resulting amplitude of the Nernst cell voltage. This means that the amplitude results from the difference between the voltages on the first line, which are positive and negative first stream.
- the signal filter further determines the mean value of the Nernst cell voltage.
- the diagnostic means comprises a second signal filter which is connected to the second and third terminals and by which a second amplitude of the cell voltage of the second cell resulting from the second current can be determined.
- the diagnostic means comprises a second arithmetic unit for determining an average value of the cell voltage of the second cell.
- Particularly advantageous is the use of a single signal filter, which can be selectively connected to the first or the second terminal.
- the line connected to the first terminal is interrupted, and the condition of the line connected to the third terminal is not recognizable
- the first power source is an AC power source for measuring an internal resistance of the first cell. It is also expedient if the second power source is a pump power source or is designed as a separate power source. In the presence of these two features, no further elements are necessary to determine the amplitudes and the mean, since the respective values are required for the internal resistance measurement of a linear exhaust gas probe.
- FIG. 1 shows a circuit arrangement which shows the basic activation of a linear oxygen sensor
- 3a, b, c the behavior of current and voltage of a real Stromguelle, to which a high output resistance is connected
- 4a, b an equivalent circuit diagram and the course of the voltage at the second terminal of a diagnostic circuit according to the invention at positive first and second currents and a line interruption at the third terminal of the diagnostic circuit
- FIGS. 8a and 8c show the use of the internal resistance measurement for
- FIG. 1 shows an electrical equivalent circuit diagram of an exhaust gas sensor 10 designed as a two-cell pumping current probe, which is regulated and monitored by a control circuit 20 becomes. Only the relevant parts of the invention are shown in each case.
- the exhaust gas sensor 10 comprises in a known manner as first cell a Nernst cell NZ and as a second cell a pump cell PZ.
- the electrical equivalent circuit diagram of the Nernst cell NZ is formed by the series connection of a resistor 11 with the resistance value Rn and a voltage source 12 with the Nernst voltage Un.
- the equivalent electrical circuit diagram of the pump cell PZ is formed by the series connection of a resistor 13 with the resistance Rp and a voltage source 14 with a pump voltage Up.
- the Nernst cell NZ and the pump cell PZ are in turn connected in series with one another, wherein a Nernst cell voltage Vn drops across the Nernst cell NZ and a pump cell voltage Vp falls above the pump cell PZ.
- the Nernst cell is connected between a first terminal VN and a third terminal VG of the drive circuit 20.
- the pump cell PZ is connected between a second terminal VIP and the third terminal VG of the drive circuit. Accordingly, the node between the pumping cell PZ and the Nernst cell NZ is connected to the third terminal VG.
- respective electrodes of the Nernst cell NZ and the pump cell PZ are connected to the first, second and third terminals VN, VIP, VG, wherein a so-called return of the exhaust gas sensor 10 is connected to the terminal VG.
- the drive circuit 20 comprises a first power source SQ1, which is designed as an AC source.
- the AC source SQ1 is used to measure the internal resistance of the Nernst cell NZ and is connected to the first terminal VN for this purpose. This is supplied with a positive supply voltage V + and a negative supply voltage V-. operated.
- a first current Icp generated by the first current source SQ1 has a positive amount in the present description as it flows in the arrow direction from the first current source SQ1 toward the Nernst cell NZ. In a corresponding manner, the first negative-current current Icp flows from the Nernst cell NZ in the direction of the first current source SQ1.
- the drive circuit 20 further comprises a second current source SQ2, which serves to generate a pump current of the pump cell PZ.
- the second current source SQ2 is connected to the second terminal VIP, wherein an absolute positive current Ip flows from the second current source SQ2 in the direction of the pump cell PZ (with the arrow direction shown in the figure).
- a negative second current flows from the pump cell PZ via the second terminal VIP in the direction of the second current source SQ2.
- the third terminal VG connected to the return lines of the Nernst cell NZ and the pump cell PZ is connected to the drive circuit 20 with a so-called "virtual ground", which is a voltage source SP from the current-voltage characteristic
- a real current source can only drive its nominal current if the voltage at its output is within a certain range.
- the current decreases or increases when the voltage is one of the supply voltages V +, V- of the voltage source. This is illustrated by way of example in FIG. see equivalent circuit diagram of a real power source SQ, which is powered by supply voltages V +, V-.
- the real current source SQ is coupled to a voltage source Ua, wherein the current source SQ drives a current Ia in the direction of the voltage source Ua.
- FIGS. 2b, 2c show the characteristic of the current Ia as a function of the voltage Ua.
- FIG. 2b shows the characteristic for a positive nominal current (ie, the current Ia flows in the direction indicated by the arrow in FIG. 2a), while
- FIG. 2c illustrates the characteristic for the negative nominal current. It can easily be seen that the current Ia corresponds to a rated current Ia_N or -Ia_N as long as the voltage Ua does not approach the lower or upper supply voltage V-, V + too much.
- FIGS. 3b and 3c shows the case in which the current source SQ has to drive its current Ia through a very high resistance Ra, which is infinite in the limit.
- Ra becomes too large, the output voltage of the source rises or falls towards one of the supply voltages V + (in the case of a positive rated current) and V- (in the case of a negative rated current), the magnitude of the current Ia becoming small, ie approaches 0 mA.
- This behavior is shown by way of example in FIGS. 3b and 3c, once for positive rated current Ia_N and once for negative rated current -IaN.
- Nernstzelllid Vn and the pump cell voltage Vp are set, different levels of voltages at the terminals VN and VG. This relationship is shown schematically in FIG.
- FIG. 4 a shows the electrical equivalent circuit diagram of the drive circuit 20 and the exhaust gas sensor 10 with the line interrupted to the third connection VG.
- 4b shows the currents Icp and Ip, in each case above the voltage U (VIP) applied to the third connection VIP.
- Icp_N or Ip_N respectively the expected rated current of the currents Icp or Ip is given in a fault-free case.
- the current-voltage curve of the first current Icp is shifted by the sum of the cell voltages Vn and Vp in relation to a plot above the voltage U (VN) applied to the first terminal. This shift is marked AV in the figure.
- a positive first current Icp and a negative second current Ip are set.
- the second current Ip is greater in magnitude than the first current Icp.
- the resulting voltage Ures at both the first terminal VN and the second terminal VIP is relatively low in accordance with the expected behavior of the real power source.
- FIG. 5a represents the electrical equivalent circuit diagram of the exhaust gas sensor 10 connected to the drive circuit 20.
- the currents Icp and Ip are shown in the correct direction according to their sign.
- the line is interrupted according to the assumption.
- FIG. 5b shows the course of the currents Icp and Ip over the voltage applied to the third terminal VIP
- a negative first current Icp and a positive second current Ip are set.
- the second current Ip is greater than the first current Icp.
- the resulting voltage at the first and second terminals VN and VIP is expected to be high according to the behavior of real power sources. This situation is illustrated in FIG. 6.
- FIG. 6a again shows the electrical equivalent circuit diagram of the exhaust gas sensor 10 connected to the control circuit 20.
- the currents Icp and Ip are correctly drawn in accordance with their sign.
- the line is again interrupted.
- FIG. 6b shows the course of the currents Icp and Ip above the voltage U (VIP) which is established at the third terminal VIP.
- the course of the first current Icp is shifted from the plot of the voltage across the first terminal VN by the sum of the cell voltages Vn + Vp.
- the voltage which arises at the third terminal VIP again results on the basis of the condition to be fulfilled.
- supply: Icp + Ip 0.
- the currents Icp and Ip were plotted against the voltage U (VIP) at the third terminal VIP.
- the following features are thus used to detect an interruption of the line connected to the third terminal VG: the voltages at the terminals VN and VG for positive Ip and Icp currents; the voltages at the terminals VN and VG at negative Icp and Ip currents.
- FIG. 7 shows the voltage curves U (VN) at the first terminal VN and U (VIP) at the second terminal VIP as a function of the currents Icp and Ip.
- the voltages which are respectively established at the terminals VN and VIP are interrupted for the cases “no error", “VN interrupted” (ie the line connected to the terminal VN is interrupted), “VIP interrupted “(ie the line connected to the VIP connection is interrupted) and” VG interrupted “(ie the line connected to the VG connection is interrupted).
- detection thresholds are shown in each case for the steps 1, 2, 3 and 4.
- the respective detection thresholds are represented by horizontal, broken lines.
- the detection threshold for the interruption at the VIP connection is indicated by hatching from bottom left to top right.
- the detection threshold for a break at port VN is indicated by hatching from top left to bottom right.
- the detection threshold for the interruption at connection VG is marked by intersecting diagonal lines.
- the voltage at connection VIP behaves according to a break in the line at connection VIP.
- an untypical behavior of the voltage U (VN) is to be determined at the terminal VN, the predetermined detection thresholds in particular being exceeded in steps 3 and 4, in which the currents Icp and Ip have different signs.
- the diagnosis can be designed particularly simply if an internal resistance measurement is implemented in the drive circuit and the results of which are also used for the diagnosis of the exhaust gas sensor. The internal resistance measurement impresses an alternating current in the Nernst cell NZ. This means that the AC source SQ1 generates positive and negative Icp currents.
- a signal filter connected to the Nernst cell determines the resulting amplitude of the Nernst cell voltage Vn. This is done by forming the difference between the voltages at the terminal VN resulting in a positive and a negative Icp current. Furthermore, the signal filter forms the mean value of the Nernst cell voltage Vn.
- FIG. 8a This procedure is shown schematically in FIG. 8a, wherein the rectangular course of the current Icp over time and the course of the voltage U (VN) at the terminal VN over time are shown.
- Vn + and Vn- respectively the positive and negative amplitude of the voltage U (VN) is marked at the terminal VN.
- Vn_AC As part of the internal resistance measurement, synchronized with the "Icp alternating current" Vn + at positive cell current and Vn measured at negative cell current.
- the amplitude Vn_AC of the voltage applied to the terminal Vn results from the difference of Vn + and Vn- and is usually positive.
- the amplitude Vp_AC and the mean value Vp_DC of the pump cell voltage Vp are determined.
- a matrix for the detection of electrical faults can be set up for the same and opposite phase Ip and Icp currents:
- Phase 1 is characterized in that Icp and Ip are in phase (see Fig. 8b). In phase 2, Icp and Ip are in antiphase (see Fig. 8c).
- the voltage profile that results at the terminals VN and VIP and the conditions that apply when the lines connected to the terminal VG are interrupted are also shown.
- the diagnosis requires the injection of certain currents into the Nernst cell NZ and pump cell PZ of the exhaust gas sensor 10.
- the diagnosis therefore requires a shutdown of the normally active pump current control. This means that during the diagnosis temporarily no lambda measurement solution possible is. This is usually uncritical, as the presence of a lead defect in general leads to typical known symptoms. For example, an excessively high internal resistance is measured or the pump current regulator runs into one
- diagnosis circuit performing the diagnosis is not explicitly shown.
- the diagnostic circuit is part of the drive circuit 20 and is designed to carry out the voltage measurements necessary for the above-described diagnosis and to set them in relation to the currents impressed by the current sources SQ1 and SQ2.
Abstract
Description
Claims
Priority Applications (4)
Application Number | Priority Date | Filing Date | Title |
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KR1020127013197A KR101734946B1 (ko) | 2009-10-22 | 2010-10-14 | 배기 가스 센서를 진단하기 위한 장치 및 방법 |
US13/503,507 US9109527B2 (en) | 2009-10-22 | 2010-10-14 | Device and method for diagnosing an exhaust gas sensor |
CN201080058869.1A CN102656354B (zh) | 2009-10-22 | 2010-10-14 | 用于诊断排气传感器的设备和方法 |
JP2012534628A JP5460878B2 (ja) | 2009-10-22 | 2010-10-14 | 排気ガスセンサの診断装置および診断方法 |
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DE102009050221.1 | 2009-10-22 | ||
DE102009050221A DE102009050221A1 (de) | 2009-10-22 | 2009-10-22 | Vorrichtung und Verfahren zur Diagnose eines Abgassensors |
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WO2011048002A1 true WO2011048002A1 (de) | 2011-04-28 |
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PCT/EP2010/065397 WO2011048002A1 (de) | 2009-10-22 | 2010-10-14 | Vorrichtung und verfahren zur diagnose eines abgassensors |
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US (1) | US9109527B2 (de) |
JP (1) | JP5460878B2 (de) |
KR (1) | KR101734946B1 (de) |
CN (1) | CN102656354B (de) |
DE (1) | DE102009050221A1 (de) |
WO (1) | WO2011048002A1 (de) |
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
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KR20120129794A (ko) * | 2011-05-18 | 2012-11-28 | 로베르트 보쉬 게엠베하 | 광대역 람다 센서에서 케이블 결함을 모니터링하기 위한 방법 및 그 컨트롤 유닛 |
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Also Published As
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JP2013508699A (ja) | 2013-03-07 |
US9109527B2 (en) | 2015-08-18 |
JP5460878B2 (ja) | 2014-04-02 |
KR101734946B1 (ko) | 2017-05-12 |
US20120266647A1 (en) | 2012-10-25 |
DE102009050221A1 (de) | 2011-05-05 |
CN102656354B (zh) | 2015-04-29 |
CN102656354A (zh) | 2012-09-05 |
KR20120098734A (ko) | 2012-09-05 |
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