• 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:
    METHOD AND DEVICE FOR MONITORING A MOISTURE SENSOR IN A COMBUSTION ENGINE, USING OXYGEN MEASUREMENT FROM OTHER SENSORS IN THE ENGINE, AS NOX, LAMBDA AND / OR OXYGEN SENSORS. The present invention provides a method and device for monitoring an ambient humidity sensor in a combustion engine, where the monitoring of the ambient humidity sensor is done by comparing the ambient humidity measured by the ambient humidity sensor determined from an oxygen measurement. at least one other sensor in the engine system, such as a NOx sensor, or Lambda and / or oxygen.
    公开号:BR112012028454B1
    申请号:R112012028454-1
    申请日:2011-05-05
    公开日:2020-11-10
    发明作者:Theophil Auckenthaler；Werner Zaehner
    申请人:Fpt Motorenforschung Ag；
    IPC主号:
    专利说明:

    Field of invention
    The present invention relates to a method and device for monitoring a humidity sensor in a combustion engine, using oxygen measurement from other sensors in the engine, such as NOx, lambda and / or oxygen sensor. Description of the Prior Art
    NOx emissions from an internal combustion engine are significantly influenced by the humidity of the ambient air. For example, in central Europe, variations in ambient humidity between summer and winter can lead to variations in NOx emissions of up to 20%.
    Therefore, a sensor can be used to correct the influence of ambient humidity on concepts, where the raw NOx emissions are calculated instead of using a NOx sensor. The relative or absolute humidity of the ambient air is measured with a humidity sensor, to be able to accurately predict engine NOx emissions. This makes the humidity sensor a relevant component of the emission, therefore it has to be monitored and verified against an independent sensor / calculation, since the emission regulations and legislation impose the monitoring of all the components that have no influence on the emissions.
    Generally, a sensor monitoring is established using redundant information from two or more independent sources such as measurements and / or models, whose reading can be verified against each other. However, monitoring an ambient humidity sensor is particularly difficult, as no obvious device can be used for a redundant determination of ambient humidity.
    In the case of NOx emissions, the comparison of NOx emissions calculated against the measures is mandatory, if only one NOx sensor is used in the exhaust gas line. This comparison is necessary to monitor the reliability of the NOx sensor reading. However, the humidity sensor cannot be monitored simultaneously and independently of this mode. In addition, the use of more than one humidity sensor is obviously expensive and should therefore be avoided.
    A possible solution to check ambient humidity should be the use of more than one NOx sensor. However, in this case, the use of an ambient humidity sensor is no longer necessary. Summary of the invention
    Therefore, it is the main objective of the present invention to provide a method and device for monitoring a humidity sensor in a combustion engine, which overcomes the above problems / disadvantages.
    The basic idea of the invention is the monitoring of an ambient humidity sensor in a combustion engine by determining the ambient humidity of the oxygen measurement of other sensors in the engine, such as NOx, lambda and / or oxygen sensor.
    These objectives and additional objectives are achieved through a method and device to monitor a humidity sensor in a combustion engine, using oxygen measurement from other sensors in the engine, such as NOx, lambda and / or oxygen sensors, as described in appended claims, which form an integral part of this description. Brief description of the drawings
    The invention will become fully evident from the following detailed description, given as an example of exemplification and non-limiting, simple, to be read with reference to the figures in the attached drawing, in which:
    Figure 1 shows a schematic of an engine system where the invention applies;
    Figure 2 shows a flow chart of the monitoring operations as an adaptation algorithm. Detailed description of preferred modalities
    The main influence of ambient humidity on NOx emissions actually reflects the decreasing availability of oxygen in the event of increasing humidity. In other words, the oxygen concentration in the ambient air decreases with increasing humidity. Therefore, the local flame temperature decreases in the cylinder, which eventually leads to lower NOx emissions.
    In many engine control systems, NOx, lambda or oxygen sensors are used to discharge the engines. During fuel cut phases, that is, when the fuel injection is closed, for example, when the vehicle is going down a hill, lambda and / or oxygen sensors measure the oxygen concentration of the ambient air. This oxygen concentration is obviously dependent on the ambient humidity.
    So, in summary, the NOx, lambda or oxygen sensor provides independent information about the level of ambient humidity, which can be used to monitor the reliability of the ambient humidity signal.
    More particularly, in many engine control systems, the use of a NOx 'sensor is mandatory to ensure persistent operation below the NOx emission limits imposed by law.
    For systems after treatment such as SCR (selective catalytic reduction) or LNT (poor NOx collectors) catalysts, not only is knowledge of the NOx concentration of the discharge pipe, but also the NOx concentration upstream of the system, crucial. This concentration can be obtained using a second NOx sensor, or it can be calculated using engine sensor information, such as pressures, temperatures, amount of fuel, engine speed, etc. In addition, ambient humidity is a crucial quantity, as it significantly influences NOx emissions. Increasing ambient humidity leads to decreasing NOx emissions. The reason is the reduced relative oxygen concentration with higher ambient humidity, which leads to lower local flame temperatures in the combustion cycle.
    In particular, when only one NOx sensor is used downstream of a device after treatment and in addition the calculation of the upstream NOx concentration is performed, the two can be compared during catalyst deactivation phases to monitor the accuracy of the NOx sensor However, since the calculation of NOx emissions depends directly on the reading of the humidity sensor, independent monitoring of the humidity sensor is necessary.
    As stated above, NOx, Lambda or oxygen sensors are widely used in combustion engines in the exhaust gas line or even in the air intake region. In addition, certain sensors such as NOx sensors also provide a lambda and / or oxygen signal. Therefore, monitoring of the ambient humidity sensor can be done by determining the ambient humidity that derives from the oxygen measurement of other sensors in the engine, such as those NOx, Lambda or oxygen sensors.
    For the purposes of the present invention, the position of the NOx, Lambda or oxygen measuring device can be anywhere in the engine discharge or intake system, even downstream of the system after treatment, if any.
    Figure 1 shows a non-limiting example of a typical engine system assembly with potential ambient humidity positions and NOx, lambda or oxygen sensors. A typical engine system includes an inlet tube 1, which is connected to the outlet tubes of an intercooler 2 and an EGR cooler 3. The discharge tube 4 of the engine is taken to the inlet of the EGR cooler and turbine 5, whose output goes to the system after treatment. The entry of the intercooler 2 comes from the compressor 6 driven by the turbine.
    Other engine system configurations are possible, for example, without an EGR system, or with a two-stage turbine, with or without system after treatment, etc.
    A humidity sensor 7 can be placed at the compressor inlet 6 or inlet pipe 1.
    One or more oxygen or lambda or NOx 8 sensors can be placed in the outlet tubes of the EGR cooler 3 (if present) or intermediate cooler 2, or at the outlet of the turbine 5, or anywhere downstream of the turbine, that is, upstream and downstream of any device (catalyst, filter, etc.) in the after-treatment system.
    If a two-stage turbine is present, the oxygen or lambda sensor can be placed between the two turbines, or at the exit of the two-stage turbine.
    Since ambient humidity is inversely proportional to ambient oxygen concentration, the oxygen measurement reading from the NOx, lambda or oxygen sensor reflects ambient humidity. However, this effect is only visible in a small range of values and with an accurate calibration of the oxygen sensor, which makes the operation difficult.
    For example, ambient humidity in Europe varies between approximately 1 and 20 g / kg. This corresponds to a concentration of water in the ambient air of approximately 0.16% to 3.2%. Since the oxygen to nitrogen air ratio is approximately 20/80, this results in a variation in oxygen concentration from approximately 0.032% to 0.67%.
    Therefore, a well-defined condition is necessary, where variations in oxygen measurement can be determined, which corresponds to ambient humidity, namely a well-known, well-defined condition, where the derivation or displacement of the lambda / NOx / oxygen sensor may be related to the variation of ambient humidity.
    A possible non-limiting example is to use the fuel cut condition. During this phase, most of the air is present in the discharge line. Under these conditions, the oxygen measurement of the NOx, lambda or oxygen sensor signal is slowly adjusted in such a way that it corresponds to a well-defined oxygen concentration, for example, 20.9% which is the oxygen concentration of air, if dry air is assumed as the reference.
    The displacement, which results from this adaptation, is dominantly dependent on the ambient humidity. Therefore, the validity of the humidity signal can be monitored using the displacement of an adaptation algorithm.
    With reference to figure 2 a non-limiting example of a block diagram of a possible adaptation algorithm is given.
    The measured oxygen value at the output of a lambda sensor or NOx or oxygen 8 is eventually corrected and filtered in a block 20 according to the sensor or model 21 information depending on specific conditions in the engine, such as the amount of fuel, amount of fuel air, gas pressure, engine speed, temperature, ... etc.
    The value eventually filtered or corrected is taken in the fuel injection cut condition (or any other well-defined operating condition, where the influence of ambient humidity can be extracted) through a cut condition 23 controller, and is taken up to a control block 24 to limit the range of values for the output, which jumps back to the other input of the cutting controller, for non-cutting conditions. The control block output is checked (25) for difference with respect to a reference oxygen value assembly 26 for sensor output in the cut condition: the difference is converted (27) into a calculated moisture value that is compared (28) with the humidity value measured by the humidity sensor 7. The difference, with or without limit, provides the displacement that can be used to emit an error or warning signal 29.
    The method described above for determining ambient humidity is completely independent of the humidity sensor and therefore acceptable for monitoring purposes.
    The processing of the humidity signal validity can be advantageously implemented in an ECU (Electronic Control Unit) of the engine.
    Therefore, the present invention can be advantageously implemented in a computer program comprising program code means for executing one or more steps of such a method, when such a program is run on a computer. For that reason the patent will also cover such a computer program and the computer-readable medium which comprises a recorded message, such a computer-readable medium comprising the program code medium for executing one or more steps of such a method, when such a program is run on a computer.
    Many changes, modifications, variations and other uses and applications of the present invention will become evident to those skilled in the art after consideration of the specification and attached drawings that reveal its preferred modalities. All such changes, modifications, variations and other uses and applications that do not depart from the spirit and scope of the invention are considered to be covered by the present invention.
    Details of additional implementations will not be described, since the person skilled in the art is capable of carrying out the invention starting from the teaching of the description above.
    权利要求:
    Claims (8)
    [0001]
    1. Method for monitoring a humidity sensor in a combustion engine system comprising a step of comparing an ambient humidity measured by the humidity sensor and an ambient humidity determined from an oxygen measurement of at least one other sensor in the engine system in the system motor, characterized by the fact that said comparison is made using a displacement of the oxygen signal reading from at least another sensor, in a condition where the derivation or displacement of the other sensor is related to the variation of ambient humidity, in which the said condition is fuel cut in the engine system.
    [0002]
    2. Method according to claim 1, characterized by the fact that at least one other sensor comprises a NOx sensor, or Lambda and / or oxygen.
    [0003]
    3. Method according to any of the preceding claims, characterized by the fact that before the comparison step, the determined ambient humidity of an oxygen measurement is corrected and filtered according to sensor information depending on specific conditions in the engine, such as fuel quantity, air quantity, gas pressure, engine speed, temperature.
    [0004]
    4. Device for monitoring a humidity sensor in a combustion engine system, the engine system comprising a humidity sensor, an intake system and a discharge system, and at least one other sensor that measures oxygen in the intake system or in the discharge system, the device being characterized by the fact that it comprises means for implementing the method as defined in any of the preceding claims.
    [0005]
    5. Device according to claim 4, characterized by the fact that the intake system (1) is connected to the outlet of an intercooler (2) and the discharge system (4) is connected to the input of at least one turbine (5), the humidity sensor (7) being placed at the compressor inlet or inlet pipe (1), at least one other sensor being placed at the outlet of the intercooler (2), or at the intake (1), or at the outlet of at least one turbine (5), the device comprising means for implementing the method as defined in claims 1 to 3.
    [0006]
    6. Device according to claim 5, characterized by the fact that the engine system comprises an EGR cooler (3) between the discharge tube (4) and the intake tube (1) and the outlet of the intermediate cooler ( 2), at least one other sensor being placed at the outlet of the EGR cooler, or at the outlet of the intermediate cooler (2) or at the intake (1), or at the outlet of at least one turbine (5).
    [0007]
    7. Device according to claim 5, characterized by the fact that at least one turbine (5) is a two-stage turbine.
    [0008]
    8. Device according to any one of claims 4 to 7, characterized in that at least one other sensor comprises a NOx sensor, or Lambda and / or oxygen.
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    法律状态:
    2018-12-26| B06F| Objections, documents and/or translations needed after an examination request according art. 34 industrial property law|
    2019-06-25| B06T| Formal requirements before examination|
    2020-03-03| B06A| Notification to applicant to reply to the report for non-patentability or inadequacy of the application according art. 36 industrial patent law|
    2020-06-09| B09A| Decision: intention to grant|
    2020-11-10| B16A| Patent or certificate of addition of invention granted|Free format text: PRAZO DE VALIDADE: 20 (VINTE) ANOS CONTADOS A PARTIR DE 05/05/2011, OBSERVADAS AS CONDICOES LEGAIS. |
    优先权:
    申请号 | 申请日 | 专利标题
    EP10162087.0|2010-05-06|
    EP10162087.0A|EP2385236B1|2010-05-06|2010-05-06|Method and device for monitoring a humidity sensor in a combustion engine, using oxygen measurement of other sensors in the engine, such as nox, lambda and/or oxygen sensors|
    PCT/EP2011/057189|WO2011138387A1|2010-05-06|2011-05-05|Method and device for monitoring a humidity sensor in a combustion engine, using oxygen measurement of other sensors in the engine, such as nox, lambda and/or oxygen sensors|
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