EP1853807A1 - Method for the voltage-controlled performance regulation of the heating of an exhaust-gas probe - Google Patents
Method for the voltage-controlled performance regulation of the heating of an exhaust-gas probeInfo
- Publication number
- EP1853807A1 EP1853807A1 EP06707876A EP06707876A EP1853807A1 EP 1853807 A1 EP1853807 A1 EP 1853807A1 EP 06707876 A EP06707876 A EP 06707876A EP 06707876 A EP06707876 A EP 06707876A EP 1853807 A1 EP1853807 A1 EP 1853807A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- heating
- voltage
- probe
- engine start
- phase
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D41/00—Electrical control of supply of combustible mixture or its constituents
- F02D41/02—Circuit arrangements for generating control signals
- F02D41/14—Introducing closed-loop corrections
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D41/00—Electrical control of supply of combustible mixture or its constituents
- F02D41/02—Circuit arrangements for generating control signals
- F02D41/14—Introducing closed-loop corrections
- F02D41/1438—Introducing closed-loop corrections using means for determining characteristics of the combustion gases; Sensors therefor
- F02D41/1493—Details
- F02D41/1494—Control of sensor heater
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D45/00—Electrical control not provided for in groups F02D41/00 - F02D43/00
Definitions
- one or more probes are arranged in the exhaust of the internal combustion engine, which typically determine the residual oxygen content of the exhaust gas based on this measurement can determine the Qualltat the combustion About a Control unit is this measurement signal, along with other characteristics such as speed, air flow or throttle angle, the fuel metering
- the probe must have a sufficient operating temperature In the warm-up phase of the probe, for example, after engine start, the probe signal is therefore not available Until reaching a sufficient probe temperature, therefore, the fuel control is replaced by a fuel control Dies As a result, no optimal classification values are achieved during this time
- Critical factors related to damage to the probe include strong temperature gradients within the probe which can lead to stress cracking due to the resulting differential thermal expansion of the probe body
- the heater in the interior of the probe and is characterized by an Al 2 O 3 layer or an Al 2 ⁇ 3-Isolationsfohe from the sensor element isolated
- the probe is heated from the inside out is chosen too high a heating rate , then the temperature gradient from the inside of the probe to the probe surface becomes so large that cracks can start from the probe surface under tension
- the heating voltage when switching on as a ramp from a suitable starting voltage, for example from 10V to the full heating voltage, for example, 13V, controlled the ramp is only started when the dew point is exceeded in the exhaust system, otherwise on the Probe impinging moisture strongly cools the probe surface and thus leads to large temperature gradients with the described effects
- the probe must not go through the entire temperature range from cold to operating temperature so after the engine start but is already preheated, whereby the heating ramp described can be passed through faster accordingly Nevertheless, the described disadvantage remains that the greatest mechanical stresses occur at the end of the ramp, what the maximum permissible rate of increase of the heating power is limited
- the object relating to the method is achieved in that in the heating phase of the heating in an initial phase, the heating voltage very quickly with respect to a follow-up phase or abruptly to a high value, preferably the full operating voltage is brought and then the heating voltage is reduced continuously or quasi-continuously Prevents a too rapid rise in the temperature in the sensor element, the tensile stresses increase so much that it exceeds the strength of the ceramic and ruptures cracks in the sensor element surface
- a preferred variant provides that the reduction of the heating voltage preferably takes place in steps between 0.1 V / s and 0.3 V / s. This results in lower tensile stresses in the surface because the maximum possible temperature difference between the surface and the interior of the lambda probe is lowered becomes
- the invention has the advantage that the reduction takes place up to a predetermined constant value or until the probe heating is completely switched off
- the ramp-shaped heating voltage is designed so that the resulting tensile stresses in the surface of the probe assume an approximately constant value over the heating phase, which is less than the mate ⁇ alspezifische strength of the surface mate ⁇ als the probe.
- the invention provides that the application of the high heating voltage and the subsequent reduction of the heating voltage occurs with the engine start
- the voltage conditions in the sensor element return to The resulting compressive stresses quickly heated heater environment produce only small tensile stresses on the sensor element surface
- the sensor element can be warmed by the low heating capacity to around 200 0 C, it is provided that the probe already at a time lying in front of the engine start signal, preferably the opening of the driver's door or the insertion of the ignition key, is preheated
- An embodiment provides that the preheating takes place at a low effective heating voltage, preferably at 2 V.
- the preheating is selected so that excessive amounts of water can not lead to the destruction of the sensor element
- a particularly simple embodiment provides that the preheating is carried out staggered. This has the advantage that the waiting time before the engine start is considerably shortened. It is provided that at a first time before the engine start lags signal a first heating power with a small fraction of the full Heating power and a second higher heating power is set with a larger fraction of the full heating power in a subsequent second before the engine start signal
- An embodiment of the invention provides that after starting the engine, the heating power is reduced compared to the Einschaltiere This is then justified that as soon as the engine starts the risk of water transport in the exhaust system increases The voltage conditions reverse in the sensor element and the resulting compressive stresses thus generate small tensile stresses on the sensor element surface
- Figure 1 is a Schurampe and a tensile stress curve according to the prior art Figure 2 an initially konzent ⁇ erte heating ramp and the associated Buchwoodsverlauf Figure 3 is a representation of the preheating and the Werners when inserting the ignition key
- Figure 4 is an illustration of the further heating with the ignition switched on and the zugeho ⁇ ge course of the tensile stresses
- Figure 5 is a representation of the reduction of heating power at engine start and tension curve Description of the embodiments
- FIG. 1 illustrates a heating ramp according to the prior art. It can be seen that, when the heating voltage is switched on, it is raised from a suitable starting voltage (in this case 10 V) steadily to the full heating voltage available (here 13 V) then started when the dew point is exceeded in the exhaust system. otherwise possible moisture will strongly cool the surface of the probe and cracking may occur. As soon as the engine starts, the heating power is reduced again. This is done according to the prior art in that the target internal resistance of the Nernst cell indicates that the operating temperature has been reached. The voltage conditions in the sensor element are reversed and no tensile stresses are generated on the sensor element surface more
- the tensile stress in MPa is indicated on the right side.
- the course of the tensile stress shows that although the stress is reduced, at the same time a fast light - off is also possible
- FIG. 2 shows an initial concentrated heating ramp which begins with full operating voltages.
- the heating voltage is lowered at a satisfactory rate along a ramp.
- the ramp is designed so that the simulated tensile stress in the surface of the sensor element is established as early as possible.
- the tensile stress then remains constant at a value that results from the material-specific strength and a safety factor
- the internal resistance of the Nernst cell is used to reach the operating temperature
- the probe is clocked with a low effective heating voltage Daduich the sensor element heats up by the low heating voltage to about 200 0 C This temperature is corresponding to the Mate ⁇ alzusammen application chosen so that any amounts of water can not lead to a Zerstomng the sensor element
- the tensile stresses behave similarly by the low heating and the tensile stresses rise only slightly When the engine is then started, the tensile stresses behave analogous to those in Figure 2
- Figure 4 describes the further heating when switching on the ignition Since the ignition of the ignition announces the early engine start, is heated with increased heating power in still air If the engine is now started, the heater jumps to its maximum value and then regulates, According to the internal resistance of the Nernst cell, on the operating temperature and thus on the operating voltage The regulation follows again the previously described heating ramp Here, too, the tensile stresses increase slowly according to the different heat outputs, which has a positive effect on the life of the sensor element
Landscapes
- 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)
- Measuring Oxygen Concentration In Cells (AREA)
- Electrical Control Of Air Or Fuel Supplied To Internal-Combustion Engine (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE102005006760A DE102005006760A1 (en) | 2005-02-15 | 2005-02-15 | Method for voltage-controlled power adjustment of the heating of an exhaust gas probe |
PCT/EP2006/050495 WO2006087261A1 (en) | 2005-02-15 | 2006-01-27 | Method for the voltage-controlled performance regulation of the heating of an exhaust-gas probe |
Publications (2)
Publication Number | Publication Date |
---|---|
EP1853807A1 true EP1853807A1 (en) | 2007-11-14 |
EP1853807B1 EP1853807B1 (en) | 2014-01-08 |
Family
ID=36218695
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP06707876.6A Active EP1853807B1 (en) | 2005-02-15 | 2006-01-27 | Method for the voltage-controlled performance regulation of the heating of an exhaust-gas probe |
Country Status (6)
Country | Link |
---|---|
US (1) | US8240127B2 (en) |
EP (1) | EP1853807B1 (en) |
JP (1) | JP4825224B2 (en) |
KR (1) | KR101092812B1 (en) |
DE (1) | DE102005006760A1 (en) |
WO (1) | WO2006087261A1 (en) |
Families Citing this family (12)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US7536999B2 (en) * | 2007-01-12 | 2009-05-26 | Nissan Motor Co., Ltd. | Air-fuel ratio control apparatus |
DE102007035188B4 (en) * | 2007-07-27 | 2009-12-24 | Continental Automotive Gmbh | Method for heating a gas sensor |
DE102008038583B4 (en) | 2007-08-23 | 2024-02-08 | Ngk Spark Plug Co., Ltd. | Gas sensor control device with two resistance setpoints to shorten the activation time of the gas sensor element |
JP4819838B2 (en) * | 2007-08-23 | 2011-11-24 | 日本特殊陶業株式会社 | Gas sensor control device |
DE102008013515A1 (en) * | 2008-03-07 | 2009-09-10 | Volkswagen Ag | Method for operating a lambda probe during the warm-up phase |
US8448511B2 (en) * | 2009-09-02 | 2013-05-28 | Ford Global Technologies, Llc | Method for evaluating degradation of a particulate matter sensor after an engine start |
DE102009055041B4 (en) * | 2009-12-21 | 2021-12-09 | Robert Bosch Gmbh | Method for quickly achieving operational readiness of a heatable exhaust gas probe |
DE102010038153B3 (en) | 2010-10-13 | 2012-03-08 | Ford Global Technologies, Llc. | Particle sensor for protection of components of exhaust system of turbocharged engine, is arranged at lower pressure side of turbocharger, and outputs signal for switching off exhaust gas recirculation |
US8490476B2 (en) | 2011-03-08 | 2013-07-23 | Ford Global Technologies, Llc | Method for diagnosing operation of a particulate matter sensor |
DE102012203401A1 (en) | 2012-03-05 | 2013-09-05 | Volkswagen Aktiengesellschaft | Method for controlling a heating device for heating a component, control device and motor vehicle with such |
US9797849B2 (en) * | 2013-03-29 | 2017-10-24 | Rosemount Analytical Inc. | Method of operation an in SITU process probe |
DE102016209075A1 (en) * | 2016-05-25 | 2017-06-08 | Continental Automotive Gmbh | Gas sensor with power limitation |
Family Cites Families (14)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE2805805C2 (en) | 1978-02-11 | 1989-07-20 | Robert Bosch Gmbh, 7000 Stuttgart | Method and device for operating a fuel supply system with lambda control |
DE4019067A1 (en) | 1990-06-15 | 1991-12-19 | Bosch Gmbh Robert | DEVICE FOR SWITCHING ON EXHAUST GAS HEATING |
JP3104362B2 (en) * | 1992-01-27 | 2000-10-30 | 株式会社デンソー | Air-fuel ratio control device for internal combustion engine |
JP3487009B2 (en) * | 1994-08-05 | 2004-01-13 | 株式会社デンソー | Oxygen sensor heater control device |
JP3436611B2 (en) * | 1995-04-28 | 2003-08-11 | 日本特殊陶業株式会社 | Method and apparatus for controlling energization of heater for oxygen sensor |
DE69720647T2 (en) * | 1996-11-06 | 2003-10-30 | Ngk Spark Plug Co | Method and device for determining the deterioration in the operation of a lambda probe with a large measuring range |
JP3385893B2 (en) * | 1997-02-21 | 2003-03-10 | トヨタ自動車株式会社 | Heater control device for air-fuel ratio sensor for internal combustion engine |
EP1026501B1 (en) * | 1999-02-03 | 2010-10-06 | Denso Corporation | Gas concentration measuring apparatus compensating for error component of output signal |
JP2002004934A (en) * | 2000-06-22 | 2002-01-09 | Unisia Jecs Corp | Control device of heater for air-fuel ratio sensor |
JP3800068B2 (en) * | 2000-12-27 | 2006-07-19 | 株式会社デンソー | Gas concentration sensor heater control device |
JP4344486B2 (en) * | 2001-03-09 | 2009-10-14 | 日本碍子株式会社 | Gas sensor |
JP4110874B2 (en) * | 2002-08-09 | 2008-07-02 | 株式会社デンソー | Heating control device for gas sensor of internal combustion engine |
JP3824984B2 (en) * | 2002-09-06 | 2006-09-20 | 三菱電機株式会社 | Exhaust gas sensor temperature control device |
JP4093919B2 (en) | 2003-06-03 | 2008-06-04 | 株式会社日立製作所 | Control device for an internal combustion engine having an exhaust gas sensor with a heater |
-
2005
- 2005-02-15 DE DE102005006760A patent/DE102005006760A1/en not_active Withdrawn
-
2006
- 2006-01-27 EP EP06707876.6A patent/EP1853807B1/en active Active
- 2006-01-27 US US11/665,463 patent/US8240127B2/en not_active Expired - Fee Related
- 2006-01-27 WO PCT/EP2006/050495 patent/WO2006087261A1/en active Application Filing
- 2006-01-27 KR KR1020077018603A patent/KR101092812B1/en active IP Right Grant
- 2006-01-27 JP JP2007554535A patent/JP4825224B2/en not_active Expired - Fee Related
Non-Patent Citations (1)
Title |
---|
See references of WO2006087261A1 * |
Also Published As
Publication number | Publication date |
---|---|
KR101092812B1 (en) | 2011-12-12 |
JP4825224B2 (en) | 2011-11-30 |
WO2006087261A1 (en) | 2006-08-24 |
DE102005006760A1 (en) | 2006-08-17 |
KR20070110851A (en) | 2007-11-20 |
US20080087005A1 (en) | 2008-04-17 |
US8240127B2 (en) | 2012-08-14 |
EP1853807B1 (en) | 2014-01-08 |
JP2008530542A (en) | 2008-08-07 |
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