DE102012201471A1 - Method for calibrating e.g. lambda probe, for acquiring partial pressure of portion of exhaust gas in gas measuring chamber of incineration system for heating e.g. timber, involves providing acquired gas portion based on measurement signal - Google Patents

Method for calibrating e.g. lambda probe, for acquiring partial pressure of portion of exhaust gas in gas measuring chamber of incineration system for heating e.g. timber, involves providing acquired gas portion based on measurement signal Download PDF

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Publication number
DE102012201471A1
DE102012201471A1 DE201210201471 DE102012201471A DE102012201471A1 DE 102012201471 A1 DE102012201471 A1 DE 102012201471A1 DE 201210201471 DE201210201471 DE 201210201471 DE 102012201471 A DE102012201471 A DE 102012201471A DE 102012201471 A1 DE102012201471 A1 DE 102012201471A1
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Germany
Prior art keywords
sensor
exhaust gas
calibration
gas sensor
signal
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DE201210201471
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German (de)
Inventor
Warren Suter
Walter Strassner
Heino Ehnis
Juergen Wilde
Alexander Bischoff
Frank Meier
Helge Schichlein
Andreas Schaak
Thomas Seiler
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Robert Bosch GmbH
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Robert Bosch GmbH
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    • GPHYSICS
    • G01MEASURING; TESTING
    • G01NINVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N27/00Investigating or analysing materials by the use of electric, electro-chemical, or magnetic means
    • G01N27/26Investigating or analysing materials by the use of electric, electro-chemical, or magnetic means by investigating electrochemical variables; by using electrolysis or electrophoresis
    • G01N27/416Systems
    • G01N27/417Systems using cells, i.e. more than one cell and probes with solid electrolytes
    • G01N27/4175Calibrating or checking the analyser

Abstract

The method involves establishing a sensor element (116) i.e. electrochemical sensor element, of an exhaust gas sensor (110) to provide an acquired portion of gas (112) in a measuring gas chamber (114) according to a measurement signal e.g. electric current signal. A replacement signal is provided in place of the measurement signal or provided supplementary to the measurement signal during calibration of the exhaust gas sensor, where the calibration step is feasible during an operation of the exhaust-gas sensor. The calibration step is automatically and/or semi-automatically performed. An independent claim is also included for an exhaust gas sensor for acquisition of a portion of gas in a gas measuring chamber.

Description

  • State of the art
  • Numerous methods and devices are known from the prior art, by means of which at least a portion of a gas in a measuring gas space can be detected. In particular, a qualitative and / or quantitative detection can be understood as detection. Examples of such devices are in particular Robert Bosch GmbH: Sensors in the motor vehicle, Edition 2010, pages 160-165 shown. In addition to the devices shown there, in particular oxygen sensors, however, there are also devices and methods for the detection of non-oxygen gases, such as nitrogen oxides (NO x ), especially in the presence of oxygen background. Such devices are for example in EP 0 769 693 A1 described. These are, in particular, zirconia-based solid electrolyte sensors. The sensors used in this case typically have a plurality of sections and / or chambers, which may be separated from one another, for example, by at least one diffusion barrier. For example, at a first pumping electrode in one or more upstream pumping chambers, oxygen can be removed from the gas entering the chambers, so that ideally no oxygen is present in downstream chambers. In order to set an oxygen content in an upstream, at least one first chamber, at least one pumping voltage is generally applied between a pumping electrode arranged in this upstream chamber and an outer electrode arranged outside the chamber, in particular such that one between a reference electrode in an air reference and a measuring electrode Nernst voltage detected in the chamber is adjusted to a constant value. In a downstream chamber, a sensor electrode may be provided, which decomposes the nitrogen oxides and pumps the resulting oxygen as an ionic current to the reference electrode or to another electrode. A corresponding electric current can be measured and can serve as a measure of an NO or NO x concentration in the gas.
  • In the automotive field, generally, durability and / or signal reliability for a duration of approximately 6,000 hours of operation may be required. In non-automotive applications, such as in heaters and / or stationary internal combustion engines, and / or in off-road vehicles and / or aircraft drives and / or marine propulsion systems, the required service life may be considerably higher in some cases. For example, signals, in particular signals of the exhaust gas sensor, may change over time, for example as a result of aging effects, which occur more intensively with uniform and / or long-term operation of the exhaust gas sensor, for example at a typical combustion combustion area of 8% to 10%. Oxygen. For example, the exhaust gas sensor can be operated at a start of heating systems with a measuring range of, for example, -20 mV in lean gas to 900 mV in the rich gas at 15% oxygen. In contrast, there are also lambda probes, which have a larger measuring range and run stable over time. These lambda probes, in particular lambda probes according to the amperometric limiting current principle, can be used, for example, as a base probe for the present invention, in particular in addition to a possible use of at least one at least single-cell broadband probe.
  • One way to modify the exhaust gas sensor signal and thus counteract a change in the signal is, for example in DE 10 2009 029 168 A1 described. This publication describes a circuit arrangement for detecting a physical variable in the exhaust gas of an internal combustion engine with a sensor of a first type or a sensor of a second type. The sensor of the first type or the sensor of the second type is at least one electronic circuit for simulating a sensor, respectively assigned to another type. For example, an output of a changed voltage signal or current signal will also be described herein.
  • A conversion, in particular of the exhaust gas sensor signal, into an analog output signal range of, for example, 0-10 V and / or 0-20 mA or a digital output signal range, as defined, for example, in CAM protocols, is also already state of the art.
  • Calibration of exhaust gas sensors installed in heating systems is usually carried out in air, therefore an expansion of the exhaust gas sensor is currently necessary for a renewed calibration. Currently, lambda probes from the automotive sector are usually used for applications in heating technology. Although here the lambda probes are usually operated under different conditions than in the car and much longer, it is required that the exhaust gas sensor works with a desired signal characteristic, in particular from the perspective of the heating user, largely maintenance-free or low maintenance. For a wide range of not in the automotive testing secured non-OEM (Original Equipment Manufacturer) applications, such as for stationary internal combustion engines and / or off-road vehicles and / or aircraft engines and / or marine propulsion systems, are currently from the prior technology only a few or no standard products are known, which could be easily docked, for example, on established interfaces there.
  • It would therefore be desirable to have an exhaust gas sensor which modifies an exhaust gas sensor signal after the occurrence of an impermissible deviation, for example due to aging effects, such that a new condition of the exhaust gas sensor signal is preferably present again. It would be desirable to provide a replacement signal even during a modification, for example, so that a heating operation can continue uninterrupted, and / or at least an output of a maintenance signal. Preferably, a suitable time and / or operating point should also be detected and / or waited for, in which a modification of the sensor signal can start and / or take place. The application of exhaust gas sensors in heating systems, in particular a modification of known lambda sensors for heating systems, can have a high market potential. Therefore, an exhaust gas sensor and / or a method, in particular for use in heating systems, important.
  • Disclosure of the invention
  • Accordingly, a method and an exhaust gas sensor are proposed which at least largely avoid the disadvantages of known methods and exhaust gas sensors. In a first aspect of the present invention, a method is proposed for calibrating an exhaust gas sensor for detecting at least a portion of a gas in a measuring gas space, in particular in a heating system. By the term "calibration" can be understood, for example, a measurement, which for a determination and / or documentation and / or compensation for a deviation of a behavior of a device, in particular the exhaust gas sensor, to another device and / or to an earlier state of the Exhaust gas sensor can be used. The calibration can be carried out for example due to aging effects and / or manufacturing variations. In the context of the present invention, "calibrating" can also include remedying an aging effect and / or a production spread. In principle, the exhaust gas sensor may be any device which is set up to detect a portion of a gas in a measuring gas space. The exhaust gas sensor may, for example, be a lambda probe and / or a NO x sensor. The detection may, for example, be a quantitative and / or qualitative detection, in particular a measurement. The proportion may be, for example, a partial pressure and / or a percentage of a gas component in the gas. In principle, the gas may be any fluid medium, and the gas may preferably be an offgas. The gas component may be, for example, oxygen and / or nitrogen and / or a nitrogen oxide and / or a hydrocarbon and / or hydrogen and / or other types of gas components, in particular those gas components, which may preferably be specifically detected. In principle, the measurement gas space can be any space through which the gas flows and / or which is supplied with the gas and / or which is filled by the gas. For example, the measuring gas space may be an exhaust gas tract of a heating system, for example a chimney and / or an exhaust pipe, and / or an air supply line to a heating system. In principle, the measuring gas space can be any supply air and / or exhaust air tract, in particular an internal combustion engine, for example a burner. The heating system can be, for example, a device that is set up to generate heat. For example, the heating system may be a device that generates heat by burning fossil fuels, such as wood and / or oil and / or gas. For example, it may also be a waste incineration plant and / or a district heating power plant and / or a cogeneration plant. Particularly preferably, the heating system may be a heater, for example with at least one furnace and / or at least one hearth. The heating system may for example comprise at least one burner.
  • The exhaust gas sensor comprises at least one sensor element. In principle, the sensor element can be any device which is set up to detect at least one measured value. The sensor element may in particular be an electrochemical sensor element. Particularly preferably, the sensor element may be a device which is designed to detect the at least one portion of the gas in the measurement gas space. The sensor element may comprise, for example, a ceramic layer structure. The sensor element may in particular be designed as known from the prior art, for example as described above. The sensor element can in principle be multicellular, but can also be configured as a single cell. The sensor element may be, for example, a lambda probe, in particular a broadband lambda probe and / or a jump probe. The sensor element may have, for example, at least two electrodes and at least one solid electrolyte connecting the electrodes. An electrode may in particular be a component which is connected to an electrical Voltage and / or can be acted upon by an electric current. For example, the electrode may be made at least partially of a conductive material. The at least two electrodes can be, for example, at least one outer pumping electrode and / or at least one inner pumping electrode and / or at least one reference electrode. A solid electrolyte may in particular be a ceramic solid electrolyte, such as zirconia, in particular yttrium-stabilized zirconia (YSZ) and / or scandium-doped zirconia (ScSZ). The solid electrolyte, for example a solid electrolyte, may preferably be gas-impermeable and / or may ensure ionic transport, for example ionic oxygen transport. The sensor element may in particular be designed to generate at least one sensor signal. The sensor signal may be any signal generated by physical processes.
  • The sensor element is set up to provide at least one measurement signal corresponding to the detected proportion of the gas in the measurement gas space. In principle, the measurement signal may be any signal which correlates with the portion of the gas to be detected in the measurement gas space. The measurement signal may be, for example, an electrical signal, for example an electrical current and / or an electrical voltage. The measurement signal may be, for example, at least one analog signal and / or at least one digital signal. By way of example, the measuring signal may be at least one pumping current and / or at least one pumping voltage. By way of example, the measurement signal may also be at least one temperature and / or at least one pressure.
  • The method comprises at least one calibration step. In principle, the calibration step may be any method step which at least partially comprises the calibration of the exhaust gas sensor. For example, the calibration step may be a time-limited phase of the method.
  • The calibration step is feasible during operation of the exhaust gas sensor. In particular, a mode of the exhaust gas sensor can be understood as operating, in particular a mode of the exhaust gas sensor outside production, for example in the case of a user, in particular in a boiler room. The operation may in particular be a mode of the exhaust gas sensor when the heating system is switched on, for example also during a detection of the at least one portion of the gas in the measuring gas space. In particular, the calibration step during operation can not be an initial calibration of the exhaust gas sensor, for example during production. For example, the calibration step during operation may also be a calibration step outside a workshop of a person skilled in the art. The calibration step during operation can be carried out in particular in and / or on the heating system. The exhaust gas sensor can be integrated, for example, in the heating system, in particular during the calibration step. For example, the exhaust gas sensor may also be removed from the heating system during the calibration step. In principle, the exhaust gas sensor can also be arranged externally, in particular outside the heating system. The exhaust gas sensor may, for example, be designed and / or arranged centrally and / or decentrally. The exhaust gas sensor can be arranged for example in a control of the heating system and / or an engine. For example, the exhaust gas sensor, at least electronically, be connected to the heating system and / or the control of the heating system and / or to the engine.
  • The exhaust gas sensor and / or the sensor element and / or the heating system may in particular comprise at least one controller. The controller can be set up to carry out the method according to the invention and / or to control the exhaust gas sensor according to the invention and / or the heating system. The controller may be connected, for example via at least one interface with the sensor element. The controller may be completely or partially integrated in the sensor element and / or in the exhaust gas sensor and / or in the heating system. For example, the controller may also be completely or partially integrated in other components, for example in a plug and / or in an engine control and / or in a heating control. The controller may, for example, comprise at least one application device, for example to apply current and / or voltage to the electrodes. The application device may be, for example, a voltage source and / or a current source. Furthermore, the controller may optionally comprise at least one measuring device, for example at least one voltage measuring device and / or at least one current measuring device. Furthermore, the controller may, for example, comprise at least one evaluation device, for example at least one data processing device. Further optionally, the controller may include at least one signal generator. In addition, the controller may optionally include at least one controller, for example at least one lock-in controller. The exhaust gas sensor may be configured, for example, as a plug-in sensor. Particularly preferred may the exhaust gas sensor have at least one housing.
  • During the calibration step, at least one substitute signal, for example instead of the measurement signal or in addition to the measurement signal, can be provided. The substitute signal may, for example, be a signal which is set up to continue a heating operation and / or to continue operation. In particular, during the calibration step, for example, controlled and / or quasi-controlled. The substitute signal can be set up, in particular, in order to allow a heating operation to continue uninterrupted, in particular during the calibration step and / or during operation with a removed sensor element and / or during interruption of detection of the at least one portion of the gas in the sample gas space, for example the sensor element. The substitute signal may in particular also be a signal which may at least be similar to a measurement signal. For example, the substitute signal may preferably be an electrical signal, for example an electrical current and / or an electrical voltage. The substitute signal may be, for example, an analog signal and / or a digital signal. For example, the substitute signal may be a modified measurement signal. By way of example, the substitute signal and / or the measurement signal may be a sensor signal. The substitute signal may be, for example, an inverse measurement signal. The substitute signal can be generated in particular from the measurement signal by a modification. The modification may in particular comprise an inversion and / or amplification, for example by at least one operational amplifier. The substitute signal may, for example, be a signal generated by a signal generator, wherein the signal generator may be included, for example, by the controller. The substitute signal may, for example, also be at least part of an internal reference voltage and / or a reference current. For example, the substitute signal can also be a signal which can be generated by at least one voltage divider and / or at least one current divider and / or by at least one program-controlled voltage source and / or current source, for example by the application device and / or the controller , For example, during the calibration step, for example alternately, between the substitute signal and the measurement signal and / or the actual signal can be changed, in particular controlled by the controller and / or by a user, for example manually. The substitute signal can for example be generated and / or generated, preferably by the controller. For example, the replacement signal may be at least partially generated and / or fixed by a simulation and / or may already have been stored during production in the exhaust gas sensor, for example in the controller.
  • In the method, at least one maintenance signal can be generated. The maintenance signal can in principle be any signal. For example, the maintenance signal may be a signal which comprises at least one piece of information. The maintenance signal can be, for example, an electrical signal, for example an electrical current and / or an electrical voltage. The maintenance signal can be, for example, a signal for activating at least one signal light, for example a light-emitting diode, in particular a red or orange LED. The maintenance signal may be generated, for example, by the controller and / or by the user. For example, the maintenance signal can be output, for example to the user and / or to the controller. For example, it may be requested by issuing the maintenance signal to carry out the calibration step, for example by the controller and / or by the user. For example, the maintenance signal may be used to prompt the user to perform the calibration step. For example, the maintenance signal may be used to indicate to a user that the calibration step is being performed. The maintenance signal can serve, for example, as a trigger signal for the controller for carrying out the calibration step. The maintenance signal can for example be automatically set in regular and / or irregular, for example, during production, intervals or can be set by the controller according to an evaluation of at least one parameter, for example, an operating hours and / or a temperature and / or proportion, in particular the proportion of the gas and / or a proportion of a gas component, for example in the gas, and / or a resistance.
  • The calibration step can be performed, for example, automatically and / or semi-automatically. By the term "automatically" can be understood, for example, an implementation by at least one computer program and / or by the controller. The expression "semi-automatic" can be understood to mean that at least one user and / or at least one skilled person carries out at least part of the calibration step, for example starting at least one calibration step by setting the maintenance signal and / or by receiving the maintenance signal and / or by confirming the maintenance signal ,
  • For example, in the calibration step, the sensor element may be removed from the exhaust gas sensor and / or the exhaust gas sensor may be removed from the sample gas space. For example, the sensor element and / or the exhaust gas sensor can be removed from the heating system during the calibration step. In particular, in the calibration step, the sensor element can be removed from the exhaust gas sensor. By "expanded" may be understood here that at least a portion of the sensor element and / or the exhaust gas sensor can be spatially and / or electrically removed from the exhaust gas sensor and / or from the heating system. For example, "expanded" can also be understood that at least a part of the sensor element and / or the exhaust gas sensor is not electrically connected to the heating system and / or the exhaust gas sensor during the calibration step. For example, it may be that during the calibration step, the sensor element and / or the exhaust gas sensor is not connected to the controller. For example, during the calibration step, the sensor element and / or the exhaust gas sensor may be connected to the control but not to the evaluation device and / or to an output device, for example for outputting the detected portion of the gas in the measurement gas space, in particular electrically.
  • The calibration step may comprise at least one diagnostic step, in particular for detecting at least one operating state of the exhaust gas sensor and / or the sensor element and / or the heating system. The operating state can in principle be any state of the exhaust gas sensor and / or the heating system and / or the sensor element. The calibration of the operating points of the exhaust gas sensor and / or of the sensor element can preferably take place by means of generating defined operating points and / or operating states of the heating system, in particular of the heating system. The calibration step can be carried out in particular at least one defined operating point of the heating system and / or at least one defined operating state of the heating system. The calibration step may in particular include the calibration of operating points of the exhaust gas sensor and / or of the sensor element. For example, the operating state and / or the operating point, in particular the heating system and / or the sensor element and / or the exhaust gas sensor, may be a specific parameter setting and / or their measured values and / or variables derived therefrom, for example the parameter and / or a value. The operating state, in particular of the heating system, may be, for example, a heating function and / or an efficiency and / or a heating power and / or an emission and / or a temperature of at least part of the exhaust gas sensor and / or the heating system and / or an exhaust gas temperature and / or an operating temperature and / or an operating time and / or an operating period and / or an internal resistance and / or a pumping voltage and / or a pumping current and / or a ratio between the pumping current and the pumping voltage I p / U p act. Detecting, in particular during the diagnosis step, whether a calibration, in particular the calibration step, should be initiated and / or started, may preferably be done by detecting the change of operating points of the exhaust gas sensor and / or the heating system and / or the sensor element, in particular during an expiring diagnosis , in particular during the diagnostic step, for example by at least one comparison of the pumping current I p at a certain pumping voltage U p or at several U p be accomplished. The calibration step may comprise at least one modification step, in particular for a regeneration of the sensor element and / or for an adjustment of the sensor element. The regeneration can in principle be any regeneration measure, for example an exhaust gas sensor-specific regeneration measure. For example, the regeneration can serve to reverse or reduce an aging process of the exhaust gas sensor and / or of the sensor element. For example, the regeneration may include an exchange of at least a part of the sensor element and / or the exhaust gas sensor, for example a replacement part replacement. For example, the regeneration may include at least one removal of dirt and / or contaminants, for example at the exhaust gas sensor and / or at the sensor element and / or at the heating system, for example removal of soot. For example, the regeneration may also include at least one replacement of at least one filter of the exhaust gas sensor and / or of the sensor element. The modification step may, in principle, be an arbitrary step of the method, wherein in the modification step preferably at least one property of the exhaust gas sensor and / or the sensor element and / or the heating system is changed. For example, in the modification step, at least one pumping current and / or at least one pumping voltage and / or at least one temperature of a part of the exhaust gas sensor and / or at least one contamination and / or at least one activation parameter and / or at least one calibration can be changed. The diagnostic step may, for example, be performed at least partially before the modification step. In principle, the diagnosis step and the modification step may overlap and / or may be performed simultaneously, in particular simultaneously. For example, the diagnostic step and / or the modification step are also carried out separately in time, for example successively and / or separately by at least one further process step.
  • The method can be at least partially an iterative method, wherein the diagnostic step and / or the modification step can be repeated iteratively, in particular can be repeated alternately. In this case, the iterative method can be understood in particular to mean a method which approaches a solution, for example the calibration of the exhaust gas sensor, stepwise, for example by successive approximation. The method according to the invention, in particular as an iterative method, may in particular comprise a repeated application of the modification step and / or the diagnostic step. For example, results of the first diagnostic step and / or the first modification step may be used as output values of the respectively next diagnostic step and / or of a next modification step. For example, in the method and / or iterative method, calibration may be progressively improved.
  • The exhaust gas sensor may include at least one re-adjust button. The re-adjust button may, for example, be arranged on a connection housing with integrated electronics and / or on a user interface and / or on a keyboard and / or on a touchpad and / or on an operator terminal and / or on the control. By way of example, the re-adjust button can be understood to mean a device which allows the user to start the calibration step. For example, the re-adjust button may be a reset button, such as a plug electronics housing. Actuating the re-adjust button may start and / or interrupt and / or stop the diagnostic step and / or the modification step. For example, the diagnostic step and / or the modification step may also include at least one normal operation, wherein in the normal operation preferably the detection of the at least a portion of the gas in the measurement gas space can be performed. For example, the re-adjust button may be actuated by the user and / or automatically, for example by the controller. The re-adjust button, for example, preferably be operated when removed from the exhaust gas sensor element, for example exclusively. For example, a trigger signal, in particular for starting the calibration step and / or the modification step and / or the operation and / or the normal operation, can be set by the re-adjust button.
  • The exhaust gas sensor may include at least one "+" button and / or at least one "-" button. The "+" button and / or the "-" button and / or the re-adjust button may be, for example, buttons and / or buttons and / or controls. The "+" key and / or the "-" key and / or the re-adjust button can be arranged, for example, on a touchpad and / or on a keyboard and / or on an operating unit and / or on a user interface. The "+" button and / or the "-" button and / or the re-adjust button can also be, for example, a rotary knob and / or a switch, for example a toggle switch and / or a rocker switch and / or a slide switch and / or a key switch act. The "-" key can be actuated, for example, if the operating state, in particular of the heating system and / or the exhaust gas sensor, deteriorates. The "+" key can be actuated, for example, when the operating state, in particular the heating system and / or the exhaust gas sensor, improves. The operating state, in particular the heating system and / or the exhaust gas sensor, may also be, for example, at least one efficiency and / or at least one heating power and / or at least one emission. For example, the "-" key and / or the "+" key may provide feedback on a calibration step and / or a diagnostic step and / or a modification step. Particularly preferably, the "-" key can be actuated in the event of a deviation from an original calibration, for example a positive deviation from the original calibration, in particular when the probe signal is increased. The original calibration can be, for example, a calibration in the production and / or commissioning of the exhaust gas sensor and / or the heating system or the last calibration performed and / or an adjustment. The "+" key can be actuated particularly preferably in the case of a deviation from the original calibration, for example a negative deviation from the original calibration, in particular when the probe signal is lowered. The positive and / or negative deviation from the original calibration may, for example, be a higher and / or lower slope of a characteristic compared to a characteristic curve of the original calibration. The probe signal may be, for example, the measurement signal and / or at least one electrical current and / or at least one electrical voltage. Depending on the operation of the "+" button and / or the "-" button, the characteristic curve can be changed in different ways. The characteristic may be, in particular, a dependence of the measurement signal on the proportion of the gas in the measurement gas space. The characteristic curve can be changed, for example, as part of the calibration step and / or the modification step, for example as adjustment. For example, a Offset and / or a slope of the characteristic changed, for example, increased or decreased, be. For example, the operating state, in particular the heating system and / or the exhaust gas sensor, also be entered directly, for example by a keyboard and / or by an input device, such as a manual and / or acoustic input device.
  • The modification step may comprise, for example, an inversion of at least one pumping voltage and / or at least one pumping current and / or an increase or decrease in the pumping current and / or the pumping voltage and / or a change in a temperature of at least a part of the exhaust gas sensor, in particular by a factor F. the reversal of the pump voltage and / or the pumping current may in particular be a reversal of polarity, for example a change in direction, in particular of ions propagating through the solid electrolyte. For example, F may be a function of the pumping current and / or the pumping voltage. For example, F can be an element of rational numbers and / or real numbers.
  • For example, in the modification step and / or in the calibration step, the characteristic curve can be adjusted. The characteristic curve may in particular be a relationship between the measurement signal and the proportion of the gas in the measurement gas space. In particular, the characteristic may be a calibration line. For example, the characteristic curve can be adjusted to compensate for an exhaust gas sensor drift and / or to recalibrate, for example, the heating system. For example, at least one second characteristic curve can be activated in the modification step, for example at least one second characteristic curve, which can be stored in the controller, for example in a memory of the controller, or stored.
  • In the diagnostic step, at least one point in time and / or at least one operating point, for example of the exhaust gas sensor and / or the sensor element, particularly preferably the heating system, for determining the modification step can be determined, in particular by the controller, and / or wait, for example by at least one Operating hours counter included by the exhaust gas sensor and / or by measuring a pumping voltage and / or by measuring at least one pumping current and / or at least one exhaust gas temperature, for example by at least one temperature sensor encompassed by the sensor device. For example, the point in time and / or the operating point, for example of the exhaust gas sensor and / or the sensor element, particularly preferably the heating system, can be determined by exceeding or falling below a threshold value and / or detection of at least one aging defect. At the point in time and / or at the operating point, for example the exhaust gas sensor and / or the sensor element, particularly preferably the heating system, for carrying out the modification step may be, for example, a clearly defined time and / or time range and / or method step and / or or an operating step and / or an operating mode and / or a time in an operating cycle. For example, at the point in time and / or at the operating point, for example of the exhaust gas sensor and / or the sensor element, particularly preferably the heating system, to carry out the modification step by a time for triggering a trigger signal to carry out the modification step and / or the calibration step and / / or the diagnostic step.
  • In a further aspect of the present invention, an exhaust gas sensor for detecting at least a portion of a gas in the sample gas space is proposed. The exhaust gas sensor comprises at least one sensor element. The exhaust gas sensor is configured to perform a method according to any one of the preceding claims. For example, the exhaust gas sensor may include features of the exhaust gas sensor as described above. The exhaust gas sensor may comprise, for example, at least one microcomputer, for example at least one controller.
  • The exhaust gas sensor may comprise at least one connection housing. The connection housing may, for example, be any housing which may be configured at least partially separately from the sensor element. The connection housing may, for example, comprise at least one plug and / or at least one user interface and / or at least one keyboard and / or at least one monitor and / or at least one touchpad monitor and / or comprise the controller and / or the evaluation circuit. The connection housing may have at least one "+" key or at least one "-" key and / or at least one readjustment knob, in particular as described above. The sensor element may be connectable and / or connected to at least one controller, for example a control, in particular of the exhaust gas sensor. The control of the exhaust gas sensor may for example be integrated in a connection circuit, in particular with integrated electronics and / or in a plug electronics, for example comprising at least one computer program. By "connectable" can be understood in particular an electrical connectivity and / or a connectivity for the transport of information.
  • The method according to the invention and the exhaust gas sensor according to the invention can have a multiplicity of advantages over known methods and exhaust gas sensors. For example, an electronic circuit, for example comprising the controller, and a base probe, for example a lambda probe, cooperate in such a way that a high stability, in particular of the sensor signal, in particular over the lifetime of the exhaust gas sensor, can be made possible. The controller may be configured in particular as housed in a connection housing electronics. Due to the connection housing, the exhaust gas sensor, for example as a probe, can be directly interchangeable and / or operable without additional work on a software and / or on a hardware of a heating system.
  • Brief description of the figures
  • Embodiments of the invention are illustrated in the following figures and are explained in more detail in the following description.
  • Show it:
  • 1 : A diagram of an embodiment of a method according to the invention;
  • 2A a diagram of a further embodiment of a method according to the invention in unregulated operation;
  • 2 B a diagram of a further embodiment of the method according to the invention in controlled operation; and
  • 3 : An embodiment of an exhaust gas sensor according to the invention.
  • embodiments
  • In 3 is an embodiment of an exhaust gas sensor according to the invention 110 for detecting at least a portion of a gas 112 in a sample gas room 114 shown. The exhaust gas sensor 110 includes at least one sensor element 116 , The exhaust gas sensor 110 is set up to perform a method according to the invention. The exhaust gas sensor 110 can at least one connection box 118 include. At the connection housing 118 it may be, for example, a plug. The connection housing 118 can have at least one "+" button 120 and / or at least one "-" button 122 and / or at least one re-adjust button 124 exhibit. The sensor element 116 can with at least one controller 126 , For example, a control, be connectable and / or be connected. The control 126 can, for example, in a connection circuit and / or a connection housing 118 with integrated electronics and / or in a plug electronics, for example with at least one computer program are. The control 126 For example, at least partially from the terminal housing 118 may be included, but may also be designed separately. The connection housing 118 especially with the controller 126 be connected, for example via at least one electrical line. The connection housing 118 can with the sensor element 116 be connected, in particular via at least one electrical line. In the exhaust gas sensor 110 it may in particular be a sensor for carrying out the method according to the invention. In the exhaust gas sensor 110 it may, for example, be a modification of a lambda probe known from the prior art for use in heating systems, for example in at least one heating system, in particular by suitable electronics and / or hardware, and / or for use in the method according to the invention. The modification may be, for example, at least adding the plug electronics and / or the exclusion housing 118 and / or the controller 126 act. At the connection housing 118 it may in particular be a plug, for example with electronics and / or with the re-adjust button 124 , which can trigger a recalibration process, for example. A recalibration can be carried out, for example, according to the prior art and / or with the method according to the invention, for example a search method. Through a computer program, for example in the controller 126 and / or in the connection housing 118 integrated, and / or semi-manual, for example with the "+" button 120 and / or the "-" button 122 , may be an input of emission data and / or the efficiency and / or other characteristics of the exhaust gas sensor 110 in the exhaust gas sensor 110 , For example, designed as a device done. At the sample gas chamber 114 it can in principle be any space, which of the gas 112 is flowed through and / or which with the gas 112 is acted upon and / or which of the gas 112 is filled. For example, it may be in the sample gas space 114 to act a supply air duct and / or an exhaust duct and / or an exhaust duct, such as a fireplace, a heating system. In the sensor element 116 In principle, it can be any device which is set up to detect at least one measured value. In the sensor element 116 it may in particular be an electrochemical element. The sensor element 116 may for example comprise a ceramic layer structure. The sensor element 116 may in particular be designed as in the prior art, for example as described above. The sensor element 116 can basically be multicellular, but can also be used as a single cell be designed. In the sensor element 116 in particular, it may be a broadband lambda probe. The sensor element 116 can have at least two electrodes 128 and at least one of the electrodes 128 connecting solid electrolyte 130 exhibit. For the at least two electrodes 128 For example, it may be at least one outer pumping electrode 132 and / or at least one inner pumping electrode 134 and / or at least one reference electrode. For a solid electrolyte 130 it may in particular be a ceramic solid electrolyte 130 zirconia, in particular yttrium-stabilized zirconia (YSZ) and / or scandium-doped zirconia (ScSZ). The sensor element 116 In particular, it can be set up to generate at least one sensor signal.
  • One of the electrodes 128 , For example, the outer pumping electrode 132 , for example, with the gas 112 from the sample gas chamber 114 be acted upon. In the sensor element 116 For example, it may be a sensor element 116 with a cell 144 or a sensor element 116 with two cells 144 act. For example, it may be in the sensor element 116 to act a jumping probe and / or a broadband lambda probe. The sensor element 116 For example, it is possible to generate at least one sensor signal, in particular at least one electrical pumping current I p and / or at least one electrical pumping voltage U p . For example, by means of a characteristic curve from the sensor signal to the proportion of the gas 112 , in particular to an oxygen content and / or a hydrogen content, in the gas 112 closed, preferably when a total pressure is known. The proportion can be recorded, for example, directly and / or indirectly. For example, an oxygen partial pressure can be detected directly and preferably from this and a total pressure, the oxygen content and / or the hydrogen content and / or an oxygen percentage and / or a hydrogen percentage can be determined. The exhaust gas sensor 110 For example, at least one heating element 136 exhibit. The heating element 136 For example, it may be configured to the sensor element 116 , in particular at least part of the sensor element 116 , in particular the solid electrolyte 130 in an operation of the sensor element 116 and / or the exhaust gas sensor 110 to an operating temperature of for example at least 300 ° C, in particular of at least 500 ° C, more preferably of at least 520 ° C to heat. Under the heating element 136 in particular, an electric heating element 136 be understood, for example comprising at least one electrical resistance and / or at least one Peltier element. The exhaust gas sensor 110 can continue at least one sensor element 116 enclosing protective housing 138 , in particular at least one protective tube, wherein the gas 112 through at least one opening in the protective housing 138 inflow and to the sensor element 116 can flow.
  • The control 126 and / or the connection housing 118 and / or the control can be set up in particular to carry out a method according to the invention. The control 126 , For example, the control, for example, via at least one interface 140 with the sensor element 116 be connected. The control 126 However, also completely or partially in the sensor element 116 be integrated. The control 126 For example, it can also be completely or partially integrated in other components, for example in at least one plug and / or in at least one motor control and / or in the connection housing 118 , The control 126 For example, it may comprise at least one loading device, for example at least the two electrodes 128 to be supplied with current and / or voltage. The application device may be, for example, a voltage source and / or a current source. Furthermore, the controller 126 optionally comprise at least one measuring device, for example at least one voltage measuring device and / or at least one current measuring device. Furthermore, the controller 126 optionally at least one evaluation device, for example at least one data processing device include. Furthermore, the controller 126 comprise at least one signal generator. The control 126 In addition, it may optionally include at least one controller, for example at least one lock-in controller. The sensor element 116 can be at least one porous ceramic protective layer 142 and / or at least one reference air channel 146 include. At least one of the electrodes 128 can for example via the reference air channel 146 be connected to an environment space. The surrounding space can basically be any gas reservoir, in particular a gas reservoir with virtually invariable gas composition. Particularly preferably, the ambient space may be an environment with air. The ambient space can in particular of the sample gas space 114 be configured separately, for example, a gas balance between the ambient space and the sample gas space 114 can be at least largely prevented, in particular on a time scale of at least 100 seconds. The reference air channel 146 may be configured open and unfilled, but may also be completely or partially filled with at least one gas-permeable and / or porous material. Between the two electrodes 128 For example, because of a different proportion, in particular an oxygen content of the two electrodes 128 , an electrical voltage occur which can be detected as a measurement signal. In particular, by a direct or indirect detection of an electrical current and / or an electrical voltage can be concluded on the proportion.
  • In the 1 and 2 are diagrams of embodiments of the method according to the invention for calibrating the exhaust gas sensor 110 for detecting at least a portion of the gas 112 in the sample gas space 114 , in particular in the heating system, shown.
  • The sensor element 116 is set up to at least one measurement signal corresponding to the detected portion of the gas 112 in the sample gas space 114 provide. The method comprises at least one calibration step. The calibration step is during operation of the exhaust gas sensor 110 feasible. The method according to the invention is in particular a method for calibrating the exhaust gas sensor 110 , in particular in a heating system, particularly preferably in a running operation.
  • During the calibration step, at least one substitute signal may be provided instead of the measurement signal or in addition to the measurement signal. The measurement signal may be, for example, the sensor signal. The replacement signal can be made available in particular during the calibration, in particular so that an operation, particularly preferably a heating operation, can continue quasi-controlled.
  • In the method, at least one maintenance signal can be generated. By issuing the maintenance signal can be requested to carry out the calibration step. The maintenance signal can be output, for example, by a light-emitting diode, in particular for requesting the calibration. Particularly preferably, the maintenance signal can be set by lighting a red and / or orange LED, for example on the connection housing 118 which may be configured, for example, as a plug electronics housing. For example, the calibration, in particular a sensor signal modification, can be manually initiated and / or controlled by a service technician.
  • The calibration step can be performed automatically and / or semi-automatically. The calibration, for example a recalibration, in particular the calibration step, can be carried out at least partially according to a method according to the prior art and / or with the method according to the invention, for example with the aid of at least one computer program and / or semi-manual, for example with the "+" - button 120 and / or the "-" button 122 ,
  • The sensor element 116 For example, in the calibration step, preferably during a part of the calibration step, from the exhaust gas sensor 110 be expanded and / or removed and / or the exhaust gas sensor 110 and / or the sensor element 116 can be from the sample gas chamber 114 be expanded and / or expanded. The calibration step may include at least one diagnostic step, in particular for detecting at least one operating state of the exhaust gas sensor 110 and / or the sensor element 116 and / or the exhaust gas sensor 110 , include. The calibration step may comprise at least one modification step, in particular for a regeneration of the sensor element 116 and / or to an adjustment of the sensor element 116 , include. For example, an exhaust gas sensor drift and / or drifting of the heating system can be compensated. For example, in particular automatically, a stable operating point, in particular the heating system, for example, at the beginning of the service life of the exhaust gas sensor 110 , be learned, in particular by means of fuzzy logic in the controller 126 , especially in the control electronics. For example, a characteristic exhaust gas sensor signal value, in particular a measurement signal, when switching on the heating system, for example between 10 and 20% oxygen, more preferably 15% oxygen and / or a characteristic signal band value of the operation of the heating system, for example 5% -15% oxygen, particularly preferably 8% -10% oxygen, and / or an exhaust gas sensor signal value after a minimum switch-off duration of a burner of the heating system and / or a characteristic exhaust gas sensor signal when changing to a maximum Heizbrennerleistung and / or a characteristic exhaust gas sensor signal at expiry of a in the controller 126 and / or a heating control provided test program as suitable operating points, in particular the heating system, learned and / or stored.
  • The method may be at least partially an iterative method. The diagnosis step and / or the modification step can be repeated iteratively, for example.
  • Pressing the optional exhaust gas sensor 110 comprehensive at least one re-adjust button 124 , may start the diagnostic step and / or the modification step.
  • At the re-adjust button 124 it may be, for example, a reset button, in particular in a plug electronics and / or in a plug electronics housing. For example, the task of modifying the sensor signal, in particular the measurement signal, in such a way that as far as possible a new state is again achieved by the connection housing 118 and / or the controller 126 , in particular with integrated electronics, solved would be, with the connector housing 118 prefers the re-adjust button 124 can have. For example, an exhaust gas sensor signal value in an unscrewed, preferably ready, state, in particular in room air, for example with an oxygen content of 10-30% oxygen, more preferably 21% oxygen, and / or during maintenance, in which room air are expected at a sensor installation location can, for example, by pressing the Re-adjust button 124 , especially by a user, to be recalibrated.
  • The exhaust gas sensor 110 can be the at least one "+" button 120 and / or the at least one "-" button 122 include. The key 122 For example, in the event of a deviation from an original calibration, for example a positive deviation from the original calibration, in particular when the probe signal is increased, this can be actuated, in particular by the user. The "+" button 120 may be actuated in the event of a deviation from the original calibration, for example a negative deviation from the original calibration, in particular when the probe signal is lowered, likewise for example by the user. Depending on the operation of the "+" button 120 or the "-" button 122 the characteristics can be changed in different ways. In particular, the modification step, for example, the sensor signal modification, alternatively or in addition to the re-adjust button 124 with the "+" button 120 and / or the "-" button 122 , for example, at the terminal building 118 , preferably with integrated electronics, during maintenance or emission measurement.
  • For example, the heating system can be operated in a first step, for example a heater, under normal conditions. Here, for example, the re-adjust button 124 , in particular of the connection housing 118 , be pressed. Thereafter, for example, a defined time, in particular a waiting time, for example, from 1 second to 5 hours, preferably from 1 minute to 1 hour, particularly preferably 30 minutes to wait. During the waiting time, for example, the operating state, in particular the heating system and / or the exhaust gas sensor 110 and / or the sensor element 116 , For example, a heating function, are observed, in particular at least one efficiency and / or at least one heating power and / or at least one emission. In a second step, the re-adjust button 124 , preferably again, be pressed. For example, a characteristic curve can be adjusted, in particular a slope and / or an offset value of the characteristic curve, in particular an exhaust gas sensor characteristic, can be increased and / or reduced and / or the heating system, in particular the heater, can be readjusted accordingly. For example, in particular again, a defined time, in particular a waiting time, for example of a duration such as the above-mentioned waiting time, in particular 30 minutes to be awaited and preferably meanwhile the heating function, in particular the heating functions and / or the operating state, in particular the heating system and / or the exhaust gas sensor 110 , to be watched. If, for example, an operating state, in particular the heating system and / or the exhaust gas sensor 110 , and / or a heating function, in particular the efficiency and / or the heating power and / or the emission, is now better than, for example, in the preceding step, the "+" key 120 otherwise, for example, the "-" key 122 especially by the user. In a third step, for example, depending on a result of the second step, a characteristic curve can be changed, in particular the slope and / or the offset value of the stored characteristic curve can be increased and / or reduced, in particular by the controller 126 and / or through the electronics. For example, it is again possible to wait for a defined time, in particular a waiting time, as defined above, and optionally the heating functions and / or the operating state, in particular the heating system and / or the exhaust gas sensor 110 For example, the efficiency and / or the heating power and / or the emission can be observed. Is the operating state, in particular the heating system and / or the exhaust gas sensor 110 , and / or the heating function and / or the efficiency and / or the heating power and / or the emission better than in the first step may preferably be the "+" button 120 pressed, otherwise the "-" button 122 ,
  • In a fourth step, for example, the third step may be repeated, in particular so often, until a visible and / or measurable improvement in the heating function and / or the operating state, in particular the heating system and / or the exhaust gas sensor 110 , and / or the efficiency and / or the heating power and / or the emission seem sufficient. The emission can be detected in particular by at least one emission measurement. The expressions "first", "second", "third" are pure terms. The order can be performed as shown. In principle, another order can be selected. By way of example, the method may comprise at least one further step in addition to the first step and / or the second step and / or the third step.
  • The modification step may comprise, in particular at least, an inversion of the at least one pump voltage and / or the at least one pump current and / or an increase of the pump current and / or the pump voltage a factor F. The method and / or the diagnosis step and / or the modification step may in particular comprise the at least one automatic sensor signal modification, in particular by a computer program in the connection housing 118 , in particular in the plug electronics, which can initiate, for example, exhaust sensor-specific regeneration measures. For example, a reversal of the pumping voltage, whereby, for example, the pumping current I p can change the direction, in particular in broadband lambda probes, whereby for example at least one aging effect can be counteracted, the aging effect, for example by polarization of at least one electrode 128 , in particular a Nernst electrode, for example by continuous storage operation, can be caused.
  • 2 B shows, for example, a diagram of the pumping current I p against the oxygen concentration p [O 2 ], in particular in a controlled operation. The regulated operation may in particular be an operation in which the pumping voltage U p is kept constant. 2 B shows in particular an operating curve Ip_alt 164 , in particular an exhaust gas sensor 110 before calibration and / or after aging, and an operating curve Ip_new 166 , in particular an exhaust gas sensor 110 after calibration and / or after regeneration and / or when new. In particular, for example, according to 2 B , the pump current is increased and / or decreased by a factor F or variable factors, where F is present, for example, in a polynomial or polynomial train, in particular as a function of U p , and / or I p and / or O 2 , in particular p [O 2 ], in the controller 126 and / or in the connection housing 118 and / or may be stored in the plug electronics. This can be carried out in particular if a factor = U p / I p is greater than a limit value, for example alternatively or additionally, even if U p / I p is less than a limit value.
  • For example, it may be necessary in the modification step and / or during a regeneration, in particular by reversing the pump voltage, to invert and / or modify the modified sensor signal, for example by at least one operational amplifier, in particular thus further a valid sensor signal for the heating system, in particular for a heating control system, which, for example, constantly and / or intermittently signals expected, is available. Alternatively or additionally, an internal reference voltage, in particular a part thereof, for example via at least one voltage divider and / or at least one program-controlled voltage source, a replacement value, in particular as a substitute signal, for example, for a short time, to the heating system, in particular to the heating control system output. In the case of regeneration, for example, the output of the substitute signal and of the actually measured exhaust-gas signal, in particular of the measuring signal, could alternate. For example, the signal may again assume its original sign during calibration or else remain inverted until a next calibration and / or regeneration. In this case, for example, a stable substitute value, in particular the replacement signal, in particular also of the plug electronics, for example, only for a short time or during the entire change of sign, may be necessary. For example, the sensor signal can be frozen for a short time and optionally an additional control pulse can be delivered. The sensor signal can be frozen in particular for 10 μs to 10 seconds, particularly preferably for 100 μs to 1 second. The control pulse may be, for example, at least one electrical pulse. In particular, the control pulse may be a pulse in order, depending on a gas composition, in particular the exhaust gas composition, for example the proportion, in particular the oxygen content, the electric current through the exhaust gas sensor 110 to control. This can be used, for example, for diagnostic purposes and / or for stabilizing the sensor signal.
  • In the modification step, for example, the characteristic curve can be adjusted. In the abovementioned cases, the modification step, in particular the modification of the sensor signal, may, for example, alternatively or additionally include an activation of a second characteristic, such as in FIG 1 represented, in particular in the plug electronics, preferably in case of need, in particular, when regeneration measures are no longer sufficient to achieve the new condition in the exhaust gas sensor signal behavior. 1 shows in particular a diagram of a tolerance range for a pumping current I p against a pumping voltage U p . This tolerance range can, for example, in the exhaust gas sensor 110 , in particular in the connection housing 118 and / or in the controller 126 be deposited. In particular, in the connection housing 118 and / or in the controller 126 at least one characteristic be deposited. An upper limit line (OG) 158 limits the tolerance range upwards, while a lower limit line (UG) 160 limits the tolerance range downwards. For example, if the characteristic is outside the tolerance range, the calibration step may be necessary and / or initiated. The line 162 shows in particular a characteristic curve when new or after a regeneration. The regeneration, in particular the diagnosis step and / or the modification step, can be carried out in particular if a value, for example an amount, of the Pumping voltage to the pumping current U p / I p is outside a predetermined tolerance band, in particular greater than a predetermined limit.
  • In the diagnostic step, at least one point in time and / or at least one operating point, for example of the exhaust gas sensor 110 and / or the sensor element 116 , particularly preferably the heating system, be determined to carry out the modification step. For example, at predefined time intervals, recalibrations, in particular the calibration, can be carried out for an optimum operating point of the heating system, in particular the heating, for example recurrently. The detection of the appropriate time and / or operating point, for example, the exhaust gas sensor 110 and / or the sensor element 116 , particularly preferably the heating system, for example, can be time-controlled, for example by an integrated operating hours counter. Alternatively or additionally, the exhaust gas temperature, which may be determinable, for example, by an integrated resistance measurement, enter into the service life determination, for example as a weighting factor. For example, the detection of the appropriate time and / or the operating point, for example, the exhaust gas sensor 110 and / or the sensor element 116 , particularly preferably the heating system, for the modification step and / or for the diagnosis step, in particular for the modification of the sensor signal, by measuring the pump voltage at a known stable operating point, for example the exhaust gas sensor 110 and / or the sensor element 116 , particularly preferably the heating system, as a so-called diagnosis done, in particular automatically, for example, also shown in the 1 and 2A , 2A shows behavior, in particular of the two cells of a 2-cell broadband probe, in an unregulated operation, in particular when the pumping voltage is not kept constant, before regeneration and / or when new 150 . 156 and after the regeneration 148 . 154 , In 2A is in the solid lines 148 . 150 in each case a dependency of the pumping current I p on the pumping voltage U p is shown and in the dashed lines 154 . 156 in each case a dependence of a Nernst voltage U N on the pump voltage U p . The Nernst voltage U N may preferably be an electrical voltage which is between two electrodes 128 at different applied proportions of the gas, in particular different partial pressures results. In particular, in this case the quotient U p / I p can be formed and, for example, in the presence of a stable operating point 152 , in particular of the sensor element 116 and / or the exhaust gas sensor 110 to be validated. For example, the quotient U p / I p can be compared to a threshold value. If this threshold and / or a range and / or a tolerance range, such as in 1 illustrated, a modification step and / or a diagnostic step, for example, a regeneration and / or modification of the sensor signal and / or the sensor, be made and / or displayed. Detecting, in particular during the diagnosis step, whether a calibration, in particular the calibration step, should be initiated and / or started, may preferably be done by detecting the change of operating points of the exhaust gas sensor 110 in particular during an expiring diagnosis, in particular during the diagnostic step, for example by at least one comparison of the pump current I p at a specific pump voltage U p or at several U p , such as in 2A represented, accomplished.
  • The inventive method and / or the exhaust gas sensor according to the invention 110 For example, to control the sensor element 116 and / or the sensor serve.
  • The inventive method and / or the exhaust gas sensor according to the invention 110 For example, they may be used to control and / or control combustion in nonautomotive applications, such as in all types of heaters, and / or stationary internal combustion engines, and / or off-road vehicles, and / or aircraft engines, and / or marine propulsion systems.
  • QUOTES INCLUDE IN THE DESCRIPTION
  • This list of the documents listed by the applicant has been generated automatically and is included solely for the better information of the reader. The list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions.
  • Cited patent literature
    • EP 0769693 A1 [0001]
    • DE 102009029168 A1 [0003]
  • Cited non-patent literature
    • Robert Bosch GmbH: Sensors in the motor vehicle, edition 2010, pages 160-165 [0001]

Claims (14)

  1. Method for calibrating an exhaust gas sensor ( 110 ) for detecting at least a portion of a gas ( 112 ) in a sample gas space ( 114 ), in particular in a heating system, wherein the exhaust gas sensor ( 110 ) at least one sensor element ( 116 ), wherein the sensor element ( 116 ) is arranged to at least one measurement signal corresponding to the detected portion of the gas ( 112 ) in the sample gas space ( 114 ), the method comprising at least one calibration step, characterized in that the calibration step during an operation of the exhaust gas sensor ( 110 ) is feasible.
  2. Method according to the preceding claim, wherein at least one substitute signal is provided instead of the measurement signal or in addition to the measurement signal during the calibration step.
  3. Method according to one of the preceding claims, wherein in the method at least one maintenance signal is generated, which is requested by issuing the maintenance signal for performing the calibration step.
  4. Method according to one of the preceding claims, wherein the calibration step is carried out automatically and / or semi-automatically.
  5. Method according to one of the preceding claims, wherein in the calibration step the sensor element ( 116 ) from the exhaust gas sensor ( 110 ) and / or the exhaust gas sensor ( 110 ) from the sample gas space ( 114 ) is expanded.
  6. Method according to one of the preceding claims, wherein the calibration step at least one diagnostic step, in particular for detecting at least one operating state of the exhaust gas sensor ( 110 ), wherein the calibration step comprises at least one modification step, in particular for a regeneration of the sensor element ( 116 ) and / or to an adjustment of the sensor element ( 116 ).
  7. A method according to the preceding claim, wherein the method is at least partially an iterative method, wherein the diagnostic step and the modification step are repeated iteratively.
  8. Method according to one of the two preceding claims, wherein the exhaust gas sensor ( 110 ) at least one re-adjust button ( 124 ), wherein an actuation of the Re-adjust button ( 124 ) starts the diagnostic step and / or the modification step.
  9. Method according to one of the three preceding claims, wherein the exhaust gas sensor ( 110 ) at least one "+" button ( 120 ) and / or at least one "-" key ( 122 ), the "-" key ( 122 ) is actuated in the event of a deviation from an original calibration, for example a positive deviation from the original calibration, in particular with an increase of a probe signal, whereby the "+" key ( 120 ) in the event of a deviation from the original calibration, for example a negative deviation from the original calibration, in particular when the probe signal is lowered, whereby, depending on the actuation of the "+" key ( 120 ) or the "-" button ( 122 ) a characteristic is changed in different ways.
  10. Method according to one of the four preceding claims, wherein the modification step comprises an inversion of at least one pumping voltage and / or at least one pumping current and / or an increase of the pumping current and / or the pumping voltage, in particular by a factor F.
  11. Method according to one of the five preceding claims, wherein in the modification step the characteristic curve is adjusted.
  12. Method according to one of the six preceding claims, wherein in the diagnostic step at least one time and / or at least one operating point for performing the modification step is determined.
  13. Exhaust gas sensor ( 110 ) for detecting at least a portion of a gas ( 112 ) in a sample gas space ( 114 ), wherein the exhaust gas sensor ( 110 ) at least one sensor element ( 116 ), wherein the exhaust gas sensor ( 110 ) is arranged to perform a method according to any one of the preceding claims.
  14. Exhaust gas sensor ( 110 ) according to the preceding claim, wherein the exhaust gas sensor ( 110 ) at least one connection housing ( 118 ), wherein the connection housing ( 118 ) at least one "+" button ( 120 ) and / or at least one "-" key ( 122 ) and / or at least one re-adjust button ( 124 ), wherein the sensor element ( 116 ) with at least one controller ( 126 ) of the exhaust gas sensor ( 110 ) is connectable.
DE201210201471 2012-02-01 2012-02-01 Method for calibrating e.g. lambda probe, for acquiring partial pressure of portion of exhaust gas in gas measuring chamber of incineration system for heating e.g. timber, involves providing acquired gas portion based on measurement signal Withdrawn DE102012201471A1 (en)

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DE201210201471 DE102012201471A1 (en) 2012-02-01 2012-02-01 Method for calibrating e.g. lambda probe, for acquiring partial pressure of portion of exhaust gas in gas measuring chamber of incineration system for heating e.g. timber, involves providing acquired gas portion based on measurement signal

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DE102015224368A1 (en) 2015-12-04 2017-06-08 Robert Bosch Gmbh Method and device for evaluating a time series
WO2018083139A1 (en) * 2016-11-02 2018-05-11 BSH Hausgeräte GmbH Calibrating an oxygen sensor of a domestic appliance

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EP0769693A1 (en) 1995-10-20 1997-04-23 Ngk Insulators, Ltd. Method and sensing device for measuring predetermined gas component in measurement gas
DE102009029168A1 (en) 2009-09-03 2011-03-17 Robert Bosch Gmbh Switching arrangement for collecting physical measured variable in exhaust gas of internal combustion engine, comprises two sensors, which are assigned electronic circuit for simulating sensor of different kinds

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0769693A1 (en) 1995-10-20 1997-04-23 Ngk Insulators, Ltd. Method and sensing device for measuring predetermined gas component in measurement gas
DE102009029168A1 (en) 2009-09-03 2011-03-17 Robert Bosch Gmbh Switching arrangement for collecting physical measured variable in exhaust gas of internal combustion engine, comprises two sensors, which are assigned electronic circuit for simulating sensor of different kinds

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102015224368A1 (en) 2015-12-04 2017-06-08 Robert Bosch Gmbh Method and device for evaluating a time series
WO2018083139A1 (en) * 2016-11-02 2018-05-11 BSH Hausgeräte GmbH Calibrating an oxygen sensor of a domestic appliance
CN109891226A (en) * 2016-11-02 2019-06-14 Bsh家用电器有限公司 The calibration of the oxygen sensor of household appliance

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