• 专利附录
  • 专利说明
  • 权利要求
  • 类似技术
  • 同族专利
  • 引用文献
  • 法律状态
  • 优先权
    • 专利摘要:
    SUMMARY Method and system for adapting a gas sensor (13) arranged in the exhaust line (3) from an internal combustion engine. Measured value sets are recorded on three or more different occasions during a time course when the composition of the combustion engine exhaust gases is maintained substantially unchanged. The respective measured value set comprises a measured value corresponding to the magnitude of the measuring signal of the gas gas sensor and a measured value corresponding to the temperature of the exhaust gases at the gas sensor. The temperature of the exhaust gases is regulated so that the temperature of the exhaust gases at the gas sensor is different at the different registration times. The starting measured values of said measured value sets and taking into account the conditions between these measured values given by the general gas law, a value of one or more constants is determined. included in the signal processing algorithm used to convert the measurement signal of the gas sensor to a value of the concentration of a specific gas in the exhaust gases. The gas sensor is adapted by adjusting the signal processing algorithm depending on the determined value of the respective constant. (Fi9 1)
    公开号:SE1050534A1
    申请号:SE1050534
    申请日:2010-05-28
    公开日:2011-11-29
    发明作者:Ola Stenlaaaas
    申请人:Scania Cv Abp；
    IPC主号:
    专利说明:

    The problem with this known adaptation method is that the given gas concentration is flawed which gives poor accuracy in the adaptation of the gas sensor. Namely, it is difficult to find an engine operating point that always gives a given and stable concentration of the gas measured by the gas sensor.
    OBJECT OF THE INVENTION The object of the present invention is to provide a new and advantageous way of adapting a gas sensor which is arranged to measure the concentration of a gas in the exhaust gases from an internal combustion engine.
    SUMMARY OF THE INVENTION According to the present invention, said object is achieved by means of a method having the features defined in claim 1 and a system having the features defined in claim 6.
    According to the invention, measured value sets are registered on three or more different occasions during a period of time when the operating conditions of the internal combustion engine are such that the composition of the exhaust gases emitted from the internal combustion engine remains substantially unchanged, each measured value set comprising a first measured value corresponding to the size of the gas. and a second measured value corresponding to the temperature at the current registration time of the exhaust gases in the part of the exhaust line where the gas sensor is located. The temperature of the exhaust gases is regulated in such a way that the temperature of the exhaust gases in the part of the exhaust line where the gas sensor is located is different at the different registration times during the current time course. Based on the measured values of said measured value sets and taking into account the relationships between these measured values given by the general gas law, a value of one or more constants is determined included in the signal processing algorithm used to convert the measuring signal of the gas sensor into a value of the concentration of a specific gas in the exhaust gases. The gas sensor is then adapted by adjusting the signal processing algorithm depending on the determined value of the respective constant.
    As mentioned above, it is difficult to find an engine operating point that always provides a given and stable concentration of the gas measured by a gas sensor in an exhaust line from an internal combustion engine.
    However, it is relatively easy to find an engine operating point that produces exhaust gases with a stable, ie in time substantially unchanged, but unknown exhaust composition. According to the General Gas Act, the concentration of an ideal gas changes but not its composition when the temperature of the gas changes while the gas pressure and volume are kept constant. By changing the temperature of the exhaust gases in the part of the exhaust line where the gas sensor is located while the exhaust pressure is kept constant, it thus becomes possible to bring about a change in the total concentration of the exhaust gases in this part of the exhaust line without affecting the exhaust gases. composition, which thus causes the gas concentration sensed by the gas sensor to change at such a temperature change. By utilizing this fact and connection provided by the general gas law, it becomes possible in accordance with the invention to effect an adaptation of the gas sensor in question with good accuracy.
    According to an embodiment of the invention, said temperature control takes place by bringing different amounts of unburned fuel to accompany the exhaust gases to a fuel oxidation device arranged in the exhaust line upstream of the gas sensor to be oxidized in the fuel oxidation device and thereby generate a temperature increase of the gas oxidants. . In this way, the desired temperature change of the exhaust gases can be achieved in a simple manner. Other advantageous features of the method and system according to the invention appear from the dependent claims and the following description.
    The invention also relates to a computer program product having the features defined in claim 9 and an electronic control unit having the features defined in claim 11.
    BRIEF DESCRIPTION OF THE DRAWINGS The invention will be described in more detail below with the aid of exemplary embodiments, with reference to the accompanying drawings.
    It is shown in: Fig. 1 a principle sketch of an internal combustion engine with associated exhaust line, Fig. 2 a principle sketch of an electronic control unit for implementing a method according to the invention, and Fig. 3 a flow diagram illustrating a method according to an embodiment of the invention .
    DETAILED DESCRIPTION OF EMBODIMENTS OF THE INVENTION The invention will be described in the following in the application of a motor vehicle. However, the invention is not limited to this application but can be used in all contexts where a gas sensor is arranged to measure the concentration of a specific gas in the exhaust gases from an internal combustion engine, such as for example in a ship or in a power station.
    Fig. 1 schematically shows an internal combustion engine 1 of a motor vehicle 2. The exhaust gases leaving the internal combustion engine 1 move in an exhaust line 3 and exit into the environment via an exhaust outlet. In the exhaust line 3, a fuel oxidizing device 4 and a particulate filter 5 are arranged in series with each other with the particulate filter located downstream of the fuel oxidizing device. Fig. 1 schematically illustrates an internal combustion engine 1 with six cylinders, but the internal combustion engine may comprise any suitable number of cylinders. Each cylinder 8 of the internal combustion engine is assigned its own injector 9, by means of which fuel is injected into the cylinder. A pump 10 is arranged to supply high-pressure fuel to the injectors 9 from a fuel tank 11. A so-called common rail (not shown), which constitutes an accumulator for accumulating high-pressure fuel to be fed to the injectors 9, can in a known manner be arranged between the pump 10 and the injectors.
    An electronic control device 12 determines the amount of fuel to be injected by the injectors 9 at each working class depending on the prevailing operating conditions of the vehicle and regulates the opening time of each injector 9, ie the duration of the period during which the injector is kept open to inject fuel. in the associated cylinder in connection with a single work stroke, depending on the determined amount of fuel injection.
    In the embodiment illustrated in Fig. 1 and described below, the fuel oxidation device 4 consists of an oxidation catalyst. The fuel oxidizing device 4 could alternatively consist of a set of two or more series-connected and / or parallel-connected oxidation catalysts, or be formed by one or more fuel oxidizing units of another type.
    In the illustrated embodiments, an injection site for fuel is found in the exhaust line 3 upstream of the oxidation catalyst 4. The injection of fuel here takes place by means of an injection device 20, which comprises an injection means 21 arranged in the exhaust line in the form of an injection nozzle. A pump 22 is arranged to supply fuel to the injector 21 from a fuel tank 11 of the vehicle. In the example illustrated in Fig. 1, the injection means 21 and the cylinders 8 of the internal combustion engine are arranged to be fed with the same fuel from a common fuel tank 11, but they could alternatively be arranged to be fed with the same kind of fuel or different types of fuels from different fuel tanks. The supply of fuel to said injection means 21 is regulated by means of a control valve 23 arranged between the fuel tank 11 and the injection means 21. The control valve 23 is controlled by the electronic control device 12. This control device 12 regulates by means of the control valve 23 how much fuel is injected into - the gases. When the particle filter 5 needs to be regenerated, ie freed from particles deposited therein, fuel is injected into the exhaust gases. This fuel accompanies the exhaust gases into the oxidation catalyst 4, where the fuel is oxidized while generating such a temperature increase of the exhaust gases that a combustion of the particles deposited in the particle filter 5 takes place, whereby the particle filter is regenerated.
    In the exhaust line 3 downstream of the particulate filter 5 or upstream of the injector 21, a reduction catalyst, for example of the SCR type (SCR = Selective Catalytic Reduction), could be arranged to effect catalytic conversion of environmentally hazardous constituents in the exhaust gases into less environmentally hazardous substances.
    A gas sensor 13 is arranged in the exhaust line 3 downstream of the fuel oxidation device 4 to measure the concentration of a specific gas in the exhaust gases flowing through the exhaust line. This gas sensor 13 can, for example, be designed to measure the concentration of NO, NO 2, N 2 O, O 2, NH 3 or CO in the exhaust gases.
    The gas sensor 13 comprises measuring means of a type known per se for generating a measuring signal S which depends on the concentration of a specific gas, such as for example NO, NO 2, N 2 O, O 2, NH 3 or CO in the exhaust gases passing through the part of the exhaust line where the gas sensor is located. The electronic control device 12 is connected to the measuring means of the gas sensor in order to receive said measuring signal therefrom. The control device 12 is arranged to, by means of a signal processing algorithm, convert the received measurement signal into a value of the concentration of the gas in question in the exhaust gases.
    A temperature sensor 14 is arranged to measure the temperature T of the exhaust gases in the part of the exhaust gas line 3 where the gas sensor 13 is located. The control device 12 is connected to this temperature sensor 14 in order to receive from it measured values regarding the prevailing exhaust gas temperature at the gas sensor 13. In the illustrated embodiment, the temperature sensor 14 is independent of the gas sensor 13. However, the temperature sensor could alternatively be integrated in the gas sensor 13 .
    The control device 12 is arranged to register measured value sets at three or more different times during a period of time when the operating conditions of the internal combustion engine 1 are such that the composition of the exhaust gases emitted from the internal combustion engine is kept substantially unchanged. These may be given operating conditions that have been found to provide a stable exhaust composition in advance. Alternatively, the control device 12 could be arranged to determine, when analyzing measured values from one or more gas sensors arranged in the exhaust line 3, when the operating conditions prevail which give a stable exhaust composition.
    Each of said measured value sets comprises a first measured value Si corresponding to the magnitude of the measuring signal of the gas sensor 13 at the current recording time and a second measured value Ti corresponding to the temperature measured by the temperature sensor 14 at the current recording time of the exhaust gases at gas sensor 13.
    In connection with the registration of these measured value sets, the control device 12 is arranged to regulate the temperature of the exhaust gases in such a way that the temperature of the exhaust gases in the part of the exhaust line where the gas sensor 13 is located is different at the different registration times during the current time. In the embodiment illustrated in Fig. 1, the control device 12 is arranged to control the temperature of the exhaust gases by controlling the amount of unburned fuel which is brought along with the exhaust gases to the oxidation catalyst 4 arranged in the exhaust line upstream of the gas sensor 13 to be oxidized therein. thereby generating a temperature increase of the exhaust gases passing through the oxidation catalyst 4. According to a first alternative, this fuel is injected into the internal combustion engine 1 as late mail injections into one or more of the internal combustion engine cylinders 8 via the respective cylinder injector 9. These mail injections are performed so late during each work stroke that no combustion occurs in the cylinder / the cylinders 8 of the fuel injected through these post-injections, whereby this fuel will thus pass further out of the internal combustion engine 1 and accompany the exhaust gases to the oxidation catalyst 4.
    According to a second alternative, the current fuel is injected into the exhaust line 3 by means of the above-mentioned injection device 20, i.e. via the injection means 21. According to a further alternative, a part of the fuel in question is injected as late post-injections into the internal combustion engine 1, while the remaining part of this fuel is injected via the injector 21. The amount of fuel that needs to be injected to achieve the desired temperature change of the exhaust gases in connection with the registration of said measured value sets is normally so small in relation to the exhaust gas quantity that its effect on the exhaust composition can be neglected in application. of the method of adaptation according to the invention.
    The control device 12 is arranged to determine a value of one or more constants included in the above-mentioned signal processing algorithm based on the measured values Si, Ti of said measured value sets, taking into account conditions between these measured values given by the general gas law. The control device 12 is then arranged to adapt the gas sensor 13 by adjusting the signal processing algorithm in dependence on the determined value of the respective constant. According to the general gas law: Pi /: nRT (1) where P is the pressure of the gas in N m'2, V is the volume of the gas in m3, n is the amount of gas in moles of gas, R is the general gas constant ( 8.3145 J mol'1 K'1) and T is the temperature of the gas in Kelvin.
    It follows from the general gas law that: n P - =: 2 V R-T () The total concentration Cm of an exhaust gas quantity is given by the formula: CTO, = § <3) where n is the total substance quantity of the exhaust gas quantity and V is the volume of the exhaust gas quantity.
    It follows from equations (2) and (3) that: c = _ (4) P Tot The ratio between the concentration CA measured by means of the gas sensor 13 and the above-mentioned total concentration Cm is as follows: CAIXLCTÛ: (5) where XA is the mole fraction of the specific gas that the gas sensor 13 is arranged to measure the concentration of.
    From equations (4) and (5) it follows that: CA = i (6) If the temperature T of the exhaust gases in the part of the exhaust line where the gas sensor 13 is located changes while the pressure P and the composition of the exhaust gases, and thereby the molar fraction XA, remains unchanged, equation (6) gives the following relation: àzä (7) CAZ II where CM is the concentration of the gas in question at temperature T1 and CA2 is the concentration of the gas in question at temperature T2.
    An embodiment of the method of adaptation according to the invention will be described in more detail below with respect to a case where the above-mentioned signal processing algorithm is an algorithm for linear adaptation, i.e. an algorithm with the following appearance: s-1 <+ L = c, (s) where S is the measurement signal from the gas sensor 13, K is a constant in the form of a so-called gain factor, L is a constant in the form of a so-called offset and CA is the concentration of the gas in question.
    In this case, measured value sets are registered on three different occasions during a period of time when the operating conditions of the internal combustion engine 1 are such that the composition of the exhaust gases emitted from the internal combustion engine is maintained substantially unchanged. The measured values S1, Tj of the first measured value set represent the measuring signal of the gas sensor and the temperature of the exhaust gases at the gas sensor 13 at the first registration, while the measured values S2, T2 of the second measured value set and the measured values S3, T3 of the third measured value set represent the measured value set. corresponding measurement signal and temperature 10 15 20 25 30 11 at the second registration time and the third registration time, respectively.
    Based on equations (7) and (8) and the three set of measurement values, the following system of equations is obtained: (S1_S2) 'K: Cfn -C / lz (S2 _S3)' K: C / lz _CA3 (9) - (12) This Equation systems (9) - (12) have four unknowns, namely K, CM, CA2 and CM, as well as four equations, which means that the gain K can be triggered. With the aid of this system of equations, a value of the gain K of the signal processing algorithm K can thus be determined. The gas sensor 13 can then be adapted by allowing the gain K of the signal processing algorithm K to assume the value thus determined. In addition, if the gas sensor 13 is zero point adapted, the above-mentioned offset L of the signal processing algorithm is known.
    In the case where the signal processing algorithm is an algorithm for nonlinear or multilinear matching, a larger number of measured value sets is required and the system of equations becomes more comprehensive.
    The control device 12 may consist of a single electronic control unit, as illustrated in Fig. 1, or of two or more mutually cooperating electronic control units.
    Fig. 3 shows a flow chart illustrating an embodiment of a method according to the present invention for adapting a gas sensor 13 of the above-mentioned type which is arranged in an exhaust line 3 from an internal combustion engine 1.
    In a first step S1, measured value sets are registered on three or more different occasions during a time course when the operating conditions of the internal combustion engine 1 are such that the composition of the exhaust gases emitted from the internal combustion engine is kept substantially unchanged, where each measured value set comprises a first measured value S, which corresponds to the magnitude of the gas sensor measuring signal at the current recording time and a second measured value T, which corresponds to the temperature at the current recording time of the exhaust gases in the part of the exhaust line where the gas sensor 13 is located, ie by temperature sensor 14 measured the temperature. During this time the temperature of the exhaust gases is regulated in such a way that the temperature of the exhaust gases in the part of the exhaust gas line where the gas sensor 13 is located is different at the different registration times. In a second step S2 is determined, based on the measured values Si, T set of measured values and taking into account the relationship between these measured values given by the General Gas Act, a value of one or more constants included in the signal processing algorithm used to convert the gas sensor's measurement signal S to a value of the concentration of a specific gas in the exhaust gases.
    In a third step S3, the gas sensor 13 is adapted by adjusting the signal processing algorithm depending on the determined value of the respective constant.
    Computer program code for implementing a method according to the invention is suitably included in a computer program which can be loaded into the internal memory of a computer, such as the internal memory of an electronic control unit of a motor vehicle. Such a computer program is suitably provided via a computer program product comprising a data storage medium readable by an electronic control unit, which data storage medium has the computer program stored thereon. Said data storage medium is, for example, an optical data storage medium in the form of a CD-ROM, a DVD disc, etc., a magnetic data storage medium in the form of a hard disk, a floppy disk, a cassette tape, etc., or a flash memory or a memory of type ROM, PROM, EPROM or EEPROM. A computer program according to an embodiment of the invention comprises computer program code for bringing an electronic control device 12: - to register measured value sets at three or more different occasions during a time course when the operating conditions of the internal combustion engine 1 are such that the composition of the exhaust gases emitted from the internal combustion engine remains substantially unchanged, where the respective measured value set comprises a first measured value Si corresponding to the magnitude of the gas sensor measuring signal at the current recording time and a second measured value Ti corresponding to the temperature at the current recording time. part of the exhaust line where the gas sensor 13 is located, - to regulate the temperature of the exhaust gases in such a way that the temperature of the exhaust gases in the part of the exhaust line where the gas sensor 13 is located is different at the different registration times during the current time, originating from the measured values Si, Ti of said measured value sets and taking into account the conditions between these measured values given by the General Gas Act, determine a value of one or more constants included in the signal processing algorithm used to convert the gas sensor measuring signal S to a value of the concentration of a specific gas in the exhaust gases, and - to adapt the gas sensor 13 by adjusting the signal processing algorithm depending on the determined value of the respective constant.
    Fig. 2 very schematically illustrates an electronic control unit 30 comprising an execution means 31, such as a central processing unit (CPU), for executing computer software. The execution means 31 communicates with a memory 32, for example of the RAM type, via a data bus 33. The control unit 30 also comprises data storage medium 34, for example in the form of a Flash memory or a memory of the type ROM, PROM, EPROM or EEPROM.
    The execution means 31 communicates with the data storage medium 34 via the data bus 33. A computer program comprising computer program code for implementing a method according to the invention, for example in accordance with the embodiment illustrated in Fig. 3, is stored on the data storage medium 34.
    The invention is of course in no way limited to the embodiments described above, but a number of possibilities for modifications thereof should be obvious to a person skilled in the art, without this for that purpose deviating from the basic idea of the invention as defined in the appended claims. .
    权利要求:
    Claims (1)
    [1]
    A method for adapting a gas sensor (13), which is arranged in an exhaust line (3) from an internal combustion engine (1) and generates a measurement signal which depends on the concentration of a specific gas in the exhaust gases passing through the exhaust line and which is converted by means of a signal processing algorithm into a value of the concentration of said gas in the exhaust gases, characterized in: - that measured values are recorded at three or more different times during a time when the combustion engine operating conditions (1 ) are such that the composition of the exhaust gases emitted from the internal combustion engine is kept substantially unchanged, the respective measured value set comprising a first measured value (Si) corresponding to the magnitude of said measuring signal at the time of registration and a second measured value (Ti) corresponding to the temperature at the current registration time of the exhaust gases in the part of the exhaust line where the gas sensor (1 3) is located, - that the temperature of the exhaust gases is regulated in such a way that the temperature of the exhaust gases in the part of the exhaust line where the gas sensor (13) is located is different at the different registration times during the current time course, - that a value of one or several constants included in the signal processing algorithm are determined on the basis of the measured values (Si, Ti) of said measured value sets taking into account conditions between these measured values given by the general gas law, and - that the gas sensor (13) is adapted by adjusting the signal processing algorithm depending on the determined value at the respective constant. Method according to claim 1, characterized in that said temperature control takes place by bringing different amounts of unburned fuel to accompany the exhaust gases to a fuel oxidizing device (4) arranged in the exhaust line upstream of the gas sensor (13) to be oxidized in the fuel oxidizing device and 35. Method according to any one of 16 thereby generating a temperature increase of the exhaust gases passing through the fuel oxidizer. Method according to Claim 2, characterized in that the fuel oxidation device (4) consists of an oxidation catalyst. claims 1-3, wherein the signal processing algorithm is a linear matching algorithm which has a gain factor (K), characterized in that: - a value of said gain factor (K) is determined on the basis of the measured values (Si, Ti) of said measured value settings taking into account the relationship between these measured values given by the General Gas Act, and - that the gas sensor (13) is adapted by causing the gain (K) of the signal processing algorithm to assume said determined value. . Method according to one of Claims 1 to 4, characterized in that the gas sensor (13) is a sensor which measures the concentration of NO, NO 2, N 2 O, O 2, NH 3 or CO. . System for adapting a gas sensor (13), which is arranged in an exhaust line (3) from an internal combustion engine (1) and generates a measurement signal which depends on the concentration of a specific gas in the exhaust gases passing through the exhaust line and which with by means of a signal processing algorithm is converted into a value of the concentration of said gas in the exhaust gases, characterized in that the system comprises an electronic control device (12) which is arranged: - to record measured value sets at three or more different times during a time course when the operating conditions of the combustion engine (1) are such that the composition of the exhaust gases emitted from the internal combustion engine is kept substantially unchanged, the respective measured value set comprising a first measured value (Si) corresponding to the magnitude of said measuring signal at the current recording time and a 10 15 20 25 30 35 17 other measured value (Ti) which corresponds to the temperature at the time of registration of the exhaust gases in the part of the exhaust line where the gas sensor (13) is located, - to regulate the temperature of the exhaust gases in such a way that the temperature of the exhaust gases in the part of the exhaust line where the gas sensor (13) is located is different at the different registration times during the current time course, - determining a value of one or more constants included in the signal processing algorithm based on the measured values (Si, Ti) of said measured value sets, taking into account conditions between these measured values given by the general gas law, and - adapting the gas sensor ( 13) by adjusting the signal processing algorithm depending on the determined value of the respective constant. System according to claim 6, characterized in that the control device (12) is arranged to regulate the temperature of the exhaust gases by controlling the amount of unburned fuel which is brought along with the exhaust gases to a gas sensor (13) arranged upstream in the exhaust line. fuel oxidizing device (4) for oxidizing in the fuel oxidizing device and thereby generating a temperature increase of the exhaust gases passing through the fuel oxidizing device. . System according to claim 6 or 7, wherein the signal processing algorithm is a linear matching algorithm which has a gain factor (K), characterized in that: - the control device (12) is arranged to determine a value of said gain factor (K) based on the measured values (Si, Ti) of said measured value sets taking into account the conditions between these measured values given by the general gas laws, and - that the control device (12) is arranged to adapt the gas sensor (13) by causing the gain of the signal processing algorithm (K) to assume said set value. 10 15 20 25 30 35 18 9. Computer program product for adapting a gas sensor (13), which is arranged in an exhaust line (3) from an internal combustion engine (1) and generates a measurement signal which depends on the concentration of a specific gas in the exhaust gases passing through the exhaust line and which by means of a signal processing algorithm is converted into a value of the concentration of said gas in the exhaust gases, the computer program product comprising computer program code for bringing an electronic control device (12): - to register measured value sets at three or more different times during a period of time when the operating conditions of the internal combustion engine (1) are such that the composition of the exhaust gases emitted from the internal combustion engine remains substantially unchanged, where each measured value set includes a first measured value (Si) corresponds to the magnitude of said measurement signal at the current recording time and a second measurement value (Ti) corresponding to the temperature at the the current registration time of the exhaust gases in the part of the exhaust line where the gas sensor (13) is located, - to regulate the temperature of the exhaust gases in such a way that the temperature of the exhaust gases in the part of the exhaust line where the gas sensor (13) is located the different recording times during the current time course, - to determine a value of one or more constants included in the signal processing algorithm based on the measured values (Si, Ti) of said measured value sets, taking into account conditions between these measured values given by the General Gas Act, and - to adapt the gas sensor (13) by adjusting the signal processing algorithm depending on the determined value of the respective constant. Computer program product according to claim 9, characterized in that the computer program product comprises a data storage medium which can be read by an electronic control unit, said computer program code being stored on the data storage medium. An electronic control unit of a motor vehicle comprising an execution means (31), a memory (32) connected to the execution means and a data storage medium (34) connected to the execution means, the computer program code of a computer program product according to claim 9 being stored on said data storage - medium (34).
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    同族专利:
    公开号 | 公开日
    EP2577014A4|2016-08-17|
    SE534845C2|2012-01-17|
    EP2577014B1|2017-11-01|
    WO2011149411A1|2011-12-01|
    EP2577014A1|2013-04-10|
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    法律状态:
    2019-01-02| NUG| Patent has lapsed|
    优先权:
    申请号 | 申请日 | 专利标题
    SE1050534A|SE534845C2|2010-05-28|2010-05-28|Method and system for adapting a gas sensor arranged in an exhaust pipe|SE1050534A| SE534845C2|2010-05-28|2010-05-28|Method and system for adapting a gas sensor arranged in an exhaust pipe|
    PCT/SE2011/050596| WO2011149411A1|2010-05-28|2011-05-11|Method and system for adaptation of a gas sensor|
    EP11786987.5A| EP2577014B1|2010-05-28|2011-05-11|Method and system for adaptation of a gas sensor|
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