EP2639512B1 - Appareil ménager avec une sonde lambda ou procédé de fonctionnement d'un appareil ménager avec une sonde lambda - Google Patents

Appareil ménager avec une sonde lambda ou procédé de fonctionnement d'un appareil ménager avec une sonde lambda Download PDF

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Publication number
EP2639512B1
EP2639512B1 EP13157931.0A EP13157931A EP2639512B1 EP 2639512 B1 EP2639512 B1 EP 2639512B1 EP 13157931 A EP13157931 A EP 13157931A EP 2639512 B1 EP2639512 B1 EP 2639512B1
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EP
European Patent Office
Prior art keywords
probe
down converter
lambda probe
voltage
household appliance
Prior art date
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Application number
EP13157931.0A
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German (de)
English (en)
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EP2639512A3 (fr
EP2639512A2 (fr
Inventor
Bernhard Koch
Josef SCHÖNHUBER
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
BSH Hausgeraete GmbH
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BSH Hausgeraete GmbH
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Priority to PL13157931T priority Critical patent/PL2639512T3/pl
Publication of EP2639512A2 publication Critical patent/EP2639512A2/fr
Publication of EP2639512A3 publication Critical patent/EP2639512A3/fr
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Publication of EP2639512B1 publication Critical patent/EP2639512B1/fr
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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24C—DOMESTIC STOVES OR RANGES ; DETAILS OF DOMESTIC STOVES OR RANGES, OF GENERAL APPLICATION
    • F24C7/00—Stoves or ranges heated by electric energy
    • F24C7/08—Arrangement or mounting of control or safety devices
    • F24C7/082—Arrangement or mounting of control or safety devices on ranges, e.g. control panels, illumination
    • F24C7/085—Arrangement or mounting of control or safety devices on ranges, e.g. control panels, illumination on baking ovens

Definitions

  • the invention relates to a household appliance with a lambda probe. According to the method, the invention relates to a method for operating a household appliance with a lambda probe.
  • Lambda probes are used to optimize fuel combustion in the engine depending on the oxygen content.
  • Lambda probes have a heating element as a probe heater.
  • a direct control of the lambda probe heating with the battery voltage of 12V is implemented.
  • the effective voltage U eff on the heating element is influenced or set by the pulsed switching with the aid of the on time t on per cycle or period T.
  • This type of control has the result that the maximum value U Bat is applied to the heating element of the probe during the time t on and that a correspondingly large heating current flows with large peak values during this time.
  • DE 102 29 026 A1 relates to an electrical circuit arrangement for the rapid heating-up operation of a lambda probe of an internal combustion engine, in particular a motor vehicle.
  • This has a microcontroller connected to a heating resistor for detecting the voltage drop across the heated heating resistor and for controlling a power output stage connected to the heating resistor in order to compensate for the voltage falling across the heating resistor as far as possible.
  • DE 10 2010 054 607 B3 relates to a cooking device with a heater, a steam generator and a control device and at least one lambda probe coupled to the control device for determining the oxygen partial pressure in the cooking space, the actual ambient pressure being determined in the control device via the oxygen partial pressure and the control device depending on the ambient pressure, the steam generator and / or the heating controls.
  • a household appliance with a lambda probe is proposed, the lambda probe being connected upstream of control electronics with a step-down converter or the lambda probe having control electronics with a step-down converter.
  • an especially commercially available lambda probe with a predetermined operating voltage can nevertheless be operated at a higher supply voltage, e.g. in the event that the household appliance only provides such a higher supply voltage.
  • the step-down converter (also referred to as a step-down converter, step-down converter or buck converter) can be used to convert a suitable voltage for operating the lambda sensor, in particular the heating of the lambda sensor, from a higher voltage.
  • the step-down converter is arranged in a region between, for example, a housing of the lambda probe and a mains voltage connection within the household appliance.
  • the step-down converter is arranged in particular in a housing which accommodates the lambda probe or is functionally assigned to the lambda probe.
  • a DC voltage can also be used, e.g. in the amount of 24Volt.
  • the cooking appliance can in particular comprise a hob, an oven (oven and / or microwave oven), a steam cooker or a vacuum cooker.
  • the household appliance is equipped with control electronics, the control electronics being connected upstream of the lambda probe or the lambda probe having control electronics.
  • the particularity of the voltage conversion used in this case is that the conversion does not already take place in the central power pack of the oven, but decentrally in the step-down converter on the control electronics of the lambda probe. Accordingly, the control electronics of the lambda probe, as well as other components of the household appliance, are also supplied with a higher voltage (for example 24V) which is already present in the oven or other cooking appliance as an exemplary household appliance for other consumers.
  • a higher voltage for example 24V
  • an output voltage of the step-down converter is applied as a probe voltage to a probe heater of the lambda probe.
  • a switch of the buck converter (109) can be controlled with a frequency which lies in a range between 20 kHz and 150 kHz.
  • a control or regulating device of the buck converter can be provided, which provides a switching signal with such a frequency to a switch of the buck converter.
  • the step-down converter can have at least one switch which can be controlled with such a frequency.
  • the step-down converter is designed as a SEPIC converter or as a ⁇ uk converter.
  • the heating probe supply voltage is generated in the form of a constant direct voltage, the generated or provided (converted) direct voltage being the maximum permissible voltage of the Lambda probe never exceeds.
  • the household appliance is designed as a cooking appliance and that at least one measurement variable or a sensor sensor size of the lambda probe is applied to a controller for controlling an automatic cooking system, in particular an automatic baking system.
  • the above object is also achieved by a method for operating a lambda probe of a household appliance, in particular a cooking appliance.
  • Operation is understood in particular to mean supplying such a component with an operating voltage, controlling a functionality of the probe or a sensor system of the probe itself, or also providing measured variables or parameters derived therefrom for other components of the household appliance.
  • Such a parameter is in particular a measurement variable which represents an oxygen content in the surroundings of the probe.
  • the household appliance is controlled by means of the at least one parameter.
  • the step-down converter is driven at a frequency that is between 20 kHz and 150 kHz.
  • lambda probes such as those used in the automotive and truck sectors
  • a power supply e.g. in the amount of 12V ensures the supply of the heating of the lambda probe (probe heating).
  • the 12V supply is achieved using the step-down converter. This is also an advantage if e.g. no further electronics module in the oven requires a 12V supply.
  • Fig. 1 shows a section of an exemplary cooking appliance 101 and a lambda probe 102 connected to it.
  • the lambda probe 102 has a sensor 103 and a probe heater 104.
  • the lambda probe 102 is connected to a controller 105 of the cooking device 101 via an interface 106.
  • the lambda probe 102 is, for example, part of a sensor system 107.
  • the sensor system 107 can be arranged outside the cooking device 101 or can be designed as part of the cooking device 101.
  • a line 108 is connected via the interface 106 to a step-down converter 109 of the sensor system 107.
  • line 108 is located relative to ground 110 a supply voltage U in of, for example, to 24V.
  • the ground connection is also connected to the interface 106 and the ground of the cooking appliance via a line.
  • the step-down converter 109 serves to convert the supply voltage U in to a probe voltage U out , for example 12V, for operating the probe heater 104.
  • the step-down converter 109 provides the probe voltage U out via a line 111 to the probe heater 104, the further connection of which is connected to ground 110.
  • the sensor system 107 is also connected via a signal or data line 112 to the interface 106 or the controller 105 in order to use the signal or Data line 112 to transmit data or signals that are based on a measured variable of sensor 103.
  • the buck converter 109 includes a switch 113 which is connected in series with a coil 114, a node 118 being arranged between the switch 113 and the coil 114.
  • the node 118 is connected to the cathode of a diode 115, the anode of the diode is connected to ground 110.
  • a capacitor 116 is arranged in parallel with the output of the buck converter.
  • the output of the buck converter 109 is connected to the probe heater 104.
  • the switch 113 is driven by a switching signal 117 with a switching frequency f.
  • the dimensioning of the buck converter 109 in connection with the switching signal 117 results in a corresponding conversion of the incoming voltage U in into the outgoing voltage U out , which is required for the operation of the lambda probe 102, in particular the probe heater 104.
  • the step-down converter 109 prevents an excessively high voltage value from being applied to the lambda probe 102 and damaging it.
  • Fig. 2 shows a schematic illustration of the sensor system 107 with a sensor system device 201 which is connected upstream of the lambda probe 102.
  • the sensor device 201 comprises the step-down converter 109.
  • the line 108 for the supply voltage U in leads into the sensor system 201 and is again connected to the step-down converter 109, which is connected to the probe heater 104 via the line 111.
  • the probe heater 104 and the sensor device 201 are each connected to ground 110.
  • a sensor line 202 leads from the sensor 103 to the transmission of a measurement variable 203 of the sensor 103 into the sensor device 201.
  • the sensor line 202 is connected in the sensor device 201 in particular to a signal processing device 204 and to a control device 205, to which the measurement variable 203 is applied.
  • the signal processing device 204 serves for preprocessing the measurement variable 203 and for outputting corresponding (eg digitized) data to the signal or data line 112.
  • the control device 205 controls the switching signal 117 (in particular the switching frequency f) and applies the switching signal 117 via a line 206 to the step-down converter 109 or to its switch 113.
  • the control device 205 can be designed as a so-called PI controller (i.e. a controller with a proportional and an integrating component).
  • a monitoring device 207 is also provided in the sensor device 201, which e.g. is connected to line 111 to probe heater 104 via an analog-digital converter.
  • the monitor 207 can e.g. determine whether the voltage applied to probe heater 104 is within an allowable range; if necessary, the monitoring device 207 can initiate a shutdown or a corresponding correction of the buck converter 109.
  • a second line 208 leads from the interface 106 to the application of a further supply voltage Ux of, for example, 5 V to the sensor device 201.
  • This additional supply voltage Ux is used to supply various components of the sensor device 201, such as the signal processing device 204, the control device 205 and the monitoring device 207, which in particular (at least partially) by means of a program in a control unit, eg a microcontroller or microprocessor.
  • the schematically illustrated embodiment supplies the lambda probe 102 with the first supply voltage U in , which is correspondingly reduced to a permissible voltage by the step-down converter 109.
  • the step-down converter 109 is operated with the higher supply voltage U in (for example 24 V).
  • the voltage U out for the probe heater 104 is set via the setting of the duty cycle of the step-down converter and the dimensioning of its components.
  • the step-down converter is activated, for example, with the aid of a microprocessor, the switch 113 preferably being operated at a clock frequency, for example in a range between 20 kHz and 150 kHz.
  • Fig. 3 denotes the probe or to the sensor system 107 the voltage waveform that results using a corresponding buck converter and an indirect control of the lambda probe 102 to the supply voltage U in of 24V. It can be seen that the probe voltage U out no longer drops to zero.
  • the control of the lambda probe 102 and the probe heater 104 is not carried out with a pulsed supply voltage, but with a constant DC voltage. This results in a more uniform current distribution and a more even or gentle probe operation.
  • the supply of the probe 102 or the probe heater 104 can also take place by using the corresponding conversion measure (i.e. the buck converter 109) with a voltage which is higher than the maximum permissible probe voltage.
  • the internal resistance of the sensor part of the lambda probe depends on an internal probe temperature.
  • the probe is preferably at a constant temperature, i.e. kept at a correspondingly constant operating point.
  • This temperature can e.g. be specified by the probe manufacturer.
  • the temperature value corresponds to a fixed setpoint of the internal resistance.
  • the microprocessor cyclically records the actual internal resistance of the probe with the help of the probe interface module. This value serves as the input signal of the (e.g. digital) PI controller, which has the task of constantly controlling the probe temperature.
  • the (e.g. digital) PI controller which has the task of constantly controlling the probe temperature.
  • the new control option presented here provides, in particular, for a step-down converter to be operated at a fixed operating frequency (e.g. in a range from 20 kHz to 150 kHz).
  • the analog output voltage of the step-down converter is set via the control signal (duty cycle).
  • the temperature control is relatively slow. It is therefore sufficient to use the PI controller e.g. to operate or determine according to a 100 Hz grid and the step-down converter e.g. to drive with a frequency of 80kHz.
  • the duty cycle (duty cycle), for example, is only reset every 10 ms. In between, i.e. the set duty cycle takes effect during the further 80 kHz cycles.
  • the maximum heating voltage can also be monitored with the aid of an AD converter, in order to ensure that the probe does not see more than the permissible voltage Umax (compare monitoring device 207 in FIG Fig. 2 ).
  • Another sensor can also be controlled on the sensor module, for example, so that it can be used as a general sensor module.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Combined Controls Of Internal Combustion Engines (AREA)
  • General Preparation And Processing Of Foods (AREA)

Claims (10)

  1. Appareil électroménager (101) comprenant une sonde lambda (102) dotée d'un chauffage de sonde (104), caractérisé en ce que :
    - un module électronique de commande (201) est connecté en amont de la sonde lambda (102) ou la sonde lambda (102) comprend un module électronique de commande (201),
    - le module électronique de commande (201) comprend un abaisseur de tension (109),
    - le module électronique de commande (201) incluant l'abaisseur de tension (109) peut être alimenté avec une tension d'alimentation,
    - une tension de sortie de l'abaisseur de tension (109) est appliquée en tant que tension de sonde (Uout) à un chauffage de sonde (104) de la sonde lambda (102), et
    - l'abaisseur de tension peut être utilisé dans un mode de conduction continu.
  2. Appareil électroménager selon la revendication 1, comprenant un système capteur (107) qui est connecté en amont de composantes de la sonde lambda (102), dans lequel le système capteur (107) comprend l'abaisseur de tension (109).
  3. Appareil électroménager selon l'une des revendications précédentes, dans lequel un commutateur de l'abaisseur de tension (109) est excitable avec une fréquence comprise dans une plage entre 20 kHz et 150 kHz.
  4. Appareil électroménager selon l'une des revendications précédentes, dans lequel l'abaisseur de tension (109) est réalisé sous forme d'un convertisseur SEPIC ou d'un convertisseur Cuk.
  5. Appareil électroménager selon l'une des revendications précédentes, dans lequel l'appareil électroménager est configuré sous forme d'un appareil de cuisson (101) et au moins une grandeur de mesure (203) d'un capteur (203) de la sonde lambda (102) ou une grandeur dérivée de celle-ci est appliquée à une commande (105) destinée à commander un dispositif automatique de cuisson, notamment un dispositif automatique de cuisson au four.
  6. Procédé de fonctionnement d'une sonde lambda (102) d'un appareil électroménager (101) dotée d'un chauffage de sonde (104), caractérisé en ce qu'un module électronique de commande (201) est connecté en amont de la sonde lambda (102) ou la sonde lambda (102) comprend un module électronique de commande (201), lequel module électronique de commande (201) comprend un abaisseur de tension (109), et dans lequel procédé :
    - le module électronique de commande (201) incluant l'abaisseur de tension (109) est alimenté avec une tension d'alimentation,
    - une tension de sortie de l'abaisseur de tension (109) est appliquée en tant que tension de sonde (Uout) à un chauffage de sonde (104) de la sonde lambda (102), et
    - l'abaisseur de tension est utilisé dans un mode de conduction continu.
  7. Procédé selon la revendication 6, dans lequel au moins un paramètre de la sonde lambda (102) est mesuré.
  8. Procédé selon l'une des revendications 6 ou 7, dans lequel l'appareil électroménager est commandé au moyen du au moins un paramètre.
  9. Procédé selon l'une des revendications 6 à 8, dans lequel l'abaisseur de tension est excité avec une fréquence comprise entre 20 kHz et 150 kHz.
  10. Procédé selon l'une des revendications 6 à 9 destiné à être exécuté dans un appareil électroménager selon l'une des revendications 1 à 5.
EP13157931.0A 2012-03-16 2013-03-06 Appareil ménager avec une sonde lambda ou procédé de fonctionnement d'un appareil ménager avec une sonde lambda Active EP2639512B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
PL13157931T PL2639512T3 (pl) 2012-03-16 2013-03-06 Urządzenie gospodarstwa domowego z sondą lambda lub sposób użytkowania urządzenia gospodarstwa domowego z sondą lambda

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE102012204224A DE102012204224A1 (de) 2012-03-16 2012-03-16 Haushaltsgerät mit einer Lambda-Sonde bzw. Verfahren zum Betreiben eines Haushaltsgeräts mit einer Lambda-Sonde

Publications (3)

Publication Number Publication Date
EP2639512A2 EP2639512A2 (fr) 2013-09-18
EP2639512A3 EP2639512A3 (fr) 2014-01-08
EP2639512B1 true EP2639512B1 (fr) 2020-05-06

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Application Number Title Priority Date Filing Date
EP13157931.0A Active EP2639512B1 (fr) 2012-03-16 2013-03-06 Appareil ménager avec une sonde lambda ou procédé de fonctionnement d'un appareil ménager avec une sonde lambda

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EP (1) EP2639512B1 (fr)
DE (1) DE102012204224A1 (fr)
PL (1) PL2639512T3 (fr)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102024202083A1 (de) 2024-03-06 2025-09-11 BSH Hausgeräte GmbH Verfahren zum Betreiben eines Haushaltsgeräts und Haushaltsgerät
DE102024202085A1 (de) 2024-03-06 2025-09-11 BSH Hausgeräte GmbH Verfahren zum Betreiben eines Haushaltsgerät und Haushaltsgerät

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4954694A (en) * 1989-01-31 1990-09-04 Matsushita Electric Industrial Co., Ltd. Cooking oven having function to automatically clean soils attached to inner walls thereof
DE10229026A1 (de) * 2002-06-28 2004-01-22 Robert Bosch Gmbh Elektrische Schaltungsanordnung zum schnellen Hochheizbetrieb einer Lambdasonde einer Brennkraftmaschine, insbesondere eines Kraftfahrzeugs
DE102007060975A1 (de) * 2007-12-14 2009-06-25 Hanning Elektro-Werke Gmbh & Co. Kg Antrieb
DE102010054607B3 (de) * 2010-12-15 2012-01-12 Rational Ag Verfahren zum Betreiben eines Gargerätes sowie Gargerät

Non-Patent Citations (1)

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Also Published As

Publication number Publication date
EP2639512A3 (fr) 2014-01-08
PL2639512T3 (pl) 2020-11-02
EP2639512A2 (fr) 2013-09-18
DE102012204224A1 (de) 2013-09-19

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