• 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:
    A method to determine the fuel composition of a fuel mixture from a first fuel and a second fuel for the operation of an internal combustion engine. The first and the second fuel have different combustion rates and/or different specific energy contents and the internal combustion engine has at least one pressure sensor in at least one combustion chamber, with which a temporal pressure curve and/or a pressure curve under conditions of angular synchronism is determined.
    公开号:SE534301C2
    申请号:SE0801003
    申请日:2008-05-06
    公开日:2011-07-05
    发明作者:Wolfgang Boerkel
    申请人:Bosch Gmbh Robert；
    IPC主号:
    专利说明:

    534 301 2 emissions in combustion, which increase exhaust emissions. According to the state of the art, such rapid changes in the composition of the fuel can be identified by means of an alcohol sensor. However, this component increases the cost of the internal combustion engine.
    US5050555 A discloses a system for controlling the ignition in an internal combustion engine which can be propelled with a fuel consisting of a mixture of alcohol and an additional fuel, such as for example petrol. The concentration of alcohol in the fuel is estimated from the combustion duration of the fuel. Furthermore, a percentage of alcohol is estimated from a comparison of the crank angle, at which the cylinder pressure reaches a maximum, with the prevailing ignition time, the estimate being stopped when the engine transitions to a transient state.
    The object of the invention is to provide a method which enables a reliable cost-effective identification of the composition of a fuel mixture of petrol and alcohol.
    Advantages of the invention The object of the invention is solved by determining the composition of the fuel mixture by the temporal and / or angular synchronous pressure profile of the gas pressure in at least one combustion chamber during a combustion phase. A fuel mixture of fuels with different combustion rates is present, for example, in an alcohol-petrol mixture, for example ethanol and methanol. Ethanol and methanol show a faster combustion process than petrol. Therefore, for example, from the temporal distance between ignition and pressure maximum in the combustion chamber, a conclusion can be drawn about the proportion of alcohol in the fuel mixture. However, the process is not limited to determining the alcohol content. For example, the proportion of another component with different combustion characteristics in petrol can also be determined by the different combustion rates. With the method according to the invention, it is advantageous to be able to determine the alcohol content already shortly after a cold start, if a procedure based on the signal from a lambda probe is not yet feasible, as the lambda probe has not yet reached its operating temperature. The method is also useful if, in a drive phase of the internal combustion engine, the lambda control is deactivated.
    In addition, the method according to the invention is genetically feasible in one or a small number of combustion cycles, while the method on the basis of the signal from the lambda probe takes up a considerably longer period of time. The method is useful in internal combustion engines which have at least one pressure sensor in an internal combustion chamber. However, it can be arranged that the method is used in selected or in all cylinders of the combustion engine.
    An advantage of the method according to the invention is that the determination of the composition of the fuel mixture is insensitive to errors in the composition of the fuel-air mixture. The method for determining the alcohol content of a signal from a lambda probe cannot distinguish between errors in determining air mass and / or fuel dosage from deviations in the fuel composition. Therefore, when combining the method according to the invention with an evaluation of the signal from the lambda probe, both the alcohol content can be identified as well as mixture formation errors are identified and corrected.
    A process variant ensures that the composition of the fuel mixture is determined from a temporal distance between ignition and maximum pressure and / or combustion center of gravity and / or some other characteristic point of combustion and / or the relative relative positions of characteristic points of combustion. This is possible as alcohol shows a faster process for combustion than petrol.
    An alternative method variant ensures that the composition of the fuel mixture is determined from the slope of a curve for an increase in pressure at a predetermined time and / or the angle of rotation of the crankshaft. In this case, depending on the time of ignition, a time or an angle of rotation of the crankshaft at a known rotational speed of the crankshaft is determined, at which the inclination of the curve for the pressure increase in the combustion chamber is determined. From the slope of the curve for the pressure increase, the proportion of alcohol in the fuel mixture can be determined as alcohol has a higher combustion rate than petrol.
    In the case of a combustion of petrol, a later increase in pressure and a slower combustion occur in comparison with a combustion of alcohol under otherwise equal conditions. Therefore, one embodiment of the method ensures that the composition of the fuel mixture is determined from the duration of an ignition delay phase and / or a reaction phase and / or a combustion phase.
    In the combustion of alcohol, iron formation occurs with a combustion of petrol under otherwise equal conditions a higher maximum pressure in the combustion chamber. Therefore, one embodiment of the method ensures that the composition of the fuel mixture is determined from a maximum pressure in the combustion chamber.
    A process variant which allows a particularly accurate and disturbingly insensitive determination of the proportion of alcohol, ensures that the composition of the fuel mixture is determined from a combination of the aforementioned characteristic data for the temporal and / or angular synchronous pressure course.
    A preferred embodiment of the process ensures that the composition of the fuel mixture is determined by shifting the time of ignition in such a way that the maximum pressure in the combustion chamber and / or the combustion center of gravity and / or some other characteristic value of the combustion is reached at a predetermined the crankshaft and that the composition of the fuel mixture is determined from the angle of rotation of the crankshaft at the time of ignition. In this way, the emitted effect and the emission of harmful substances by the internal combustion engine can be optimized.
    It can be arranged that the determination of the displacement of the ignition time takes place only in one or in selected cylinders of the internal combustion engine. However, the method can also be used for cylinder-individual displacement of the ignition timing in all cylinders.
    If the method is used to determine the composition of a gasoline / alcohol-fuel mixture, the composition of the fuel mixture can be determined faster than when determining only the signal from a lambda probe.
    In addition, mixing errors in a determination of air mass and fuel dosage can be distinguished from a determination of the alcohol content.
    权利要求:
    Claims (3)
    [1]
    A method for determining the composition of a fuel mixture of a first fuel and a second fuel for driving an internal combustion engine, the first and second fuels having different combustion rates and / or different specific energy contents and wherein the internal combustion engine has at least a pressure sensor in at least one combustion chamber, with which a temporal and / or angular synchronous pressure profile is determined in the combustion chamber and the composition of the fuel mixture is determined from the temporal and / or angular synchronous pressure profile of the gas pressure in the at least one combustion chamber of the combustion fuel for a pressure increase at a predetermined time and / or angle of rotation of the crankshaft at a known rotational speed thereof.
    [2]
    A method for determining the composition of a fuel mixture of a first fuel and a second fuel for driving an internal combustion engine, the first and second fuels having different combustion rates and / or different specific energy contents and the internal combustion engine having at least one pressure sensor in at least one combustion chamber, with which a temporal and / or angular synchronous pressure course is determined in the combustion chamber and the composition of the fuel mixture is determined from the temporal and / or angular synchronous pressure course of the gas pressure in the at least one combustion chamber during a combustion phase, characterized by .
    [3]
    A method for determining the composition of a fuel mixture of a first fuel and a second fuel for driving an internal combustion engine, the first and second fuels having different dry combustion rates and / or different specific energy contents and the internal combustion engine having at least one pressure sensor in at least one combustion chamber, with which a temporal and / or angular synchronous pressure profile is determined in the combustion chamber and the composition of the fuel mixture is determined from the temporal and / or angular synchronous pressure profile of the gas pressure in the at least one combustion chamber during a combustion phase. at a predetermined time and / or angle of rotation of the crankshaft at a known rotational speed thereof, in combination with the magnitude of a maximum pressure in the combustion chamber. . Use of the method according to any one of the preceding claims for determining the composition of a petrol / alcohol-fuel mixture. . Use of the process according to claim 4, characterized by alcohol, ethanol or methanol is used.
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    同族专利:
    公开号 | 公开日
    SE0801003L|2008-11-24|
    BRPI0801775A2|2009-01-13|
    US7963156B2|2011-06-21|
    US20080289401A1|2008-11-27|
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    引用文献:
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    JP2530625B2|1986-09-09|1996-09-04|シチズン時計株式会社|Combined display type electronic watch|
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    JPH02283860A|1989-04-24|1990-11-21|Nissan Motor Co Ltd|Ignition timing control device for engine|
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    DE102007023899A1|2007-05-23|2008-11-27|Robert Bosch Gmbh|Method for determining the composition of a fuel mixture|
    DE102007042229A1|2007-09-05|2009-03-12|Robert Bosch Gmbh|Method for determining the composition of a fuel mixture|
    DE102008001668A1|2008-05-08|2009-11-12|Robert Bosch Gmbh|Method and device for determining the composition of a fuel mixture|
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    US8843295B2|2009-05-27|2014-09-23|GM Global Technology Operations LLC|Ethanol content determination systems and methods|
    DE102011086146A1|2011-11-11|2013-05-16|Robert Bosch Gmbh|Method and device for determining the composition of a fuel mixture|
    DE102012020137B4|2012-10-15|2019-04-11|Mtu Friedrichshafen Gmbh|Method for operating a reciprocating internal combustion engine|
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    US10563594B2|2016-10-17|2020-02-18|General Electric Company|Systems and methods for predicting fuel circuit leaks|
    DE102018202819A1|2018-02-26|2018-11-22|Continental Automotive Gmbh|A method for determining the composition of a fuel mixture for an internal combustion engine and use of a device therefor|
    法律状态:
    2015-02-24| NUG| Patent has lapsed|
    优先权:
    申请号 | 申请日 | 专利标题
    DE102007023900A|DE102007023900A1|2007-05-23|2007-05-23|Method for determining a fuel composition|
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