• 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:
    An apparatus and a method for determining a combustion process variable are described. Starting from a measured variable, an actual combustion process variable is determined. A calculated combustion process variable is determined on the basis of at least a first and a second partial combustion process variable. The at least first and second partial combustion process variables are calculated by means of a model. Based on the comparison of the actual combustion process variable and the calculated combustion process variable, parameters of the model for calculating the at least first and second partial combustion process variables are corrected.
    公开号:AT514615A2
    申请号:T561/2014
    申请日:2014-07-14
    公开日:2015-02-15
    发明作者:Yvan Gauthier
    申请人:Bosch Gmbh Robert；
    IPC主号:
    专利说明:

    description
    title
    Method and device; for a the combustion history size prior art
    The invention is based on a method and a device according to the category of the independent claims.
    From DE 10 2004 001 118 a method and a device for controlling an internal combustion engine is known. There, based on a combustion chamber pressure signal, a heating curve or a combustion curve is calculated.
    An exact description of the combustion process is not possible with this procedure.
    Disclosure of the Invention Advantages of the Invention
    According to the invention, it has been recognized that combustion, in particular in a diesel internal combustion engine, is composed of a plurality of overlapping partial burns with different burning speeds. Each partial combustion is considered as a combustion process.
    The problem is that these combustion phases can not be distinguished in the course of combustion. It is therefore not readily possible to determine and influence characteristic variables of these individual combustion phases.
    By determining, based on a measured variable, an actual combustion process variable and a calculated combustion process variable based on at least a first and a second partial combustion process variable, the at least first and second partial combustion process variable being calculated by means of a model based on the comparison of the actual combustion process variable and the calculated combustion history variable parameters of the model for calculating the at least first and second partial combustion history size are corrected, the combustion history of the different combustion phases can be determined and thus considered individually. In particular, the combustion process, the start of combustion and the end of combustion and the individual combustion phases can be determined and provided as an output variable.
    It has proven to be particularly advantageous if the course of the heating process and / or the course of the combustion is used as the combustion process variable. These quantities are easy to calculate from measured quantities.
    According to the invention, it has been recognized that combustion essentially comprises a precombustion, a main combustion and an afterburning. Therefore, it is advantageous to distinguish these combustion phases. It is particularly advantageous if at least two of these combustion phases are calculated. A further improvement results when all three combustion phases are considered.
    It is particularly advantageous if the combustion chamber pressure is used as the measured variable.
    The measures listed in the dependent claims advantageous refinements and improvements of the independent claim specified device and method are possible.
    Short description of the drawing
    Embodiments of the invention are illustrated in the drawings and explained in more detail in the following description. Show it:
    FIG. 1 shows the essential elements of the device according to the invention,
    Figure 2 shows different over time plotted signals and
    FIG. 3 is a flow chart to illustrate the invention
    Method.
    In FIG. 1, a computing unit is designated by 100. A first input unit 110 supplies a current quantity I to the arithmetic unit. A second input unit 120 supplies a combustion process variable, which is also referred to below as the actual combustion process variable, to the arithmetic unit 100. This variable is preferably the combustion curve and / or the heating profile as a function of the position of the crankshaft. This variable is determined based on the measured values of a sensor, in particular a combustion chamber pressure sensor. Instead of the combustion process / heating process, other variables that contain corresponding information about the combustion process can also be used. Instead of the combustion chamber pressure sensor, another sensor, such as a structure-borne sound sensor or a lo-nenstromsensor can be used.
    The arithmetic unit 100 provides a first sub-combustion history variable to a first output unit 130. This first second Teilverbrennungsgröße is also referred to below as Vibel. The arithmetic unit 100 provides a second sub-combustion history variable to a second output unit 140. This second partial combustion process variable is also referred to below as Vibe2. The arithmetic unit 100 provides a third sub-combustion history variable to a third output unit 150. This third partial combustion process variable is also referred to below as Vibe3.
    According to the invention, it has been recognized that the combustion consists essentially of partial combustion, which provides a significant contribution to the heating process. This is a pre-combustion, a main combustion and a post-combustion.
    The corresponding Heizverläufe are shown in the first part of Figure 2 on the crankshaft position. Here, the main combustion is drawn by a solid line, the pre-combustion by a broken line, and the post-combustion by a dot-dash line.
    According to the invention, these are calculated for the three partial burns the respective Vibefunktionen Vibel, Vibe2 and Vibe3. Based on these three vibefunctions, the vibe function Vibe is calculated for the entire combustion. This is done essentially by adding the three vibrational functions of the three partial burns. This means that at least a first and a second partial combustion process variable is calculated by means of a model, and that a calculated combustion process variable is determined on the basis of at least a first and a second partial combustion process variable.
    Subsequently, the vibration function Vibe is compared with the actual combustion process variable determined from the combustion chamber pressure sensor. If the two curves are almost identical, the three vibration functions of the partial burns are output to the output unit. If they do not agree, the form factors of the vibefunctions are adjusted.
    This means that, based on the comparison of the actual combustion process variable and the calculated combustion process variable, parameters of the model for calculating the at least first and second partial combustion process variables are corrected.
    In the second part of the figure, the actual combustion history variable is shown by a solid line and the vibefiction of the entire combustion is shown by a dot-dash line.
    The calculation of the Vibefunktionen Vibe, Vibel, Vibe2 and Vibe3 will be described below with reference to FIG. From the literature, models known as vibe replacement firing are known, also referred to as vibe functions. In the calculation of the substitute combustion process, among other parameters, the start of combustion, the combustion end, the crankshaft position and various form factors are included. These form factors are also referred to as parameters of the model.
    The following describes a procedure on the example of the firing process. Instead of the firing process, other sizes can be used which have a corresponding information content. For example, the heating process can also be used.
    In a first step 210, the first derivative of the combustion process is determined.
    In a second step 220, the start of control is calculated on the basis of the current signal I. Furthermore, the end of injection is calculated from the absolute minimum of the first derivative of the firing curve.
    In a third step 230, the second derivative of the combustion process is determined.
    In a fourth step 240, the combustion starts of the partial combustion are determined on the basis of the second derivative of the combustion process. For this, the zero crossings of the heating curve and absolute maximum values of the second derivative are used. In this case, the crankshaft positions in which the zero crossing or the absolute maxima of the second derivative are regarded as combustion starts.
    In a fifth step 250, the form factors and the respective combustion end of the individual partial burns are iterated until the sum of the error squares over the entire combustion process is minimal.
    The Vibefunktionen Vibel, Vibe2, and Vibe3 of Teilverbrennungen are calculated with a parameter set and summed up. Then the summed up vibraphic function Vibe with the actual burning process, which comes from the
    Combustion chamber pressure was calculated, compared and sums the error squares over the entire combustion process.
    Subsequently, the parameter set is iterated until the sum of the error squares is minimal. With this parameter set, the Vibefunktionen Vibel, Vibe2 and Vibe3 are then calculated and output.
    This means that, based on the comparison of the actual combustion process variable and the calculated combustion process variable, parameters of the model for calculating the at least first and second partial combustion process variables are corrected.
    权利要求:
    Claims (6)
    [1]


    1. A method for determining a combustion process variable, wherein an actual combustion process variable is determined based on a measured variable, and a calculated combustion process variable is determined based on at least a first and a second partial combustion process variable, the at least first and second partial combustion process variables being calculated by means of a model, and based on the comparison of the actual combustion process variable and the calculated combustion process variable, parameters of the model for calculating the at least first and second partial combustion process variables are corrected.
    [2]
    2. The method according to claim 1, characterized in that it is the heat history and / or the combustion process in the course of combustion.
    [3]
    A method according to claim 1, characterized in that a distinction is made between a pre-combustion, a main combustion and an after-combustion as combustion phases, and the at least first and second partial combustion quantities characterize at least two of the three combustion phases.
    [4]
    4. The method according to claim 1, characterized in that the combustion chamber pressure is used as the measured variable.
    [5]
    5. The method according to claim 1, characterized in that a vibe function is used as a model.
    [6]
    6. Apparatus for determining a combustion process variable, with means which determine an actual combustion process variable based on a measured variable, determine a calculated combustion process variable based on at least one first and one second partial combustion process variable, the at least first and second partial combustion process variables being calculated by means of a model Means are provided which, based on the comparison of the actual combustion process variable and the calculated combustion process variable, correct parameters of the model for calculating the at least first and second partial combustion process variables.

    4th of July 2014
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    同族专利:
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    DE102013214252A1|2015-01-22|
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    AT514615B1|2017-10-15|
    引用文献:
    公开号 | 申请日 | 公开日 | 申请人 | 专利标题
    DE102004001118B4|2004-01-07|2018-08-23|Robert Bosch Gmbh|Method and device for controlling an internal combustion engine|
    DE102004046086A1|2004-09-23|2006-03-30|Robert Bosch Gmbh|Method and device for controlling an internal combustion engine|
    DE102008002261A1|2008-06-06|2009-12-10|Robert Bosch Gmbh|Method and device for determining one or more combustion starts in a cylinder of an internal combustion engine from a provided cylinder pressure curve|WO2019117798A1|2017-12-13|2019-06-20|Scania Cv Ab|In-cylinder pressure determination for an internal combustion engine|
    法律状态:
    2021-03-15| MM01| Lapse because of not paying annual fees|Effective date: 20200714 |
    优先权:
    申请号 | 申请日 | 专利标题
    DE102013214252.8A|DE102013214252A1|2013-07-22|2013-07-22|Method and apparatus for the combustion history variable|
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