• 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:
    The invention relates to a method for generating an at least partially suppressed output data stream (15) by detecting and selectively filtering a combustion chamber signal (1) recorded on an internal combustion engine, comprising the following steps: - recording a combustion chamber signal (1) and creating a combustion chamber signal data stream (2), - simultaneously recording a crank angle signal (3) and generating a crank angle signal data stream (4), splitting or duplicating the combustion chamber signal data stream (2), creating a first filtered combustion chamber signal data stream (23), optionally creating a second filtered combustion chamber signal data stream (24), creating a first transformed combustion chamber signal data stream (20) by transforming (8) the first filtered combustion chamber signal data stream (23) from time base to crank angle basis and creating a second transformed combustion chamber signal data stream (21) by transforming (9) the second optionally filtered one Combining the transformed combustion chamber signal data streams (20, 21) such that the output data stream in a first crank angle range (17) the first transformed combustion chamber signal data stream (20) and in a second crank angle range (19) the second transformed combustion chamber signal data stream (21).
    公开号:AT518869A4
    申请号:T50874/2016
    申请日:2016-09-28
    公开日:2018-02-15
    发明作者:
    申请人:Avl List Gmbh；
    IPC主号:
    专利说明:

    Summary
    The invention relates to a method for creating an at least partially suppressed output data stream (15) by detecting and selectively filtering a combustion chamber signal (1) recorded on an internal combustion engine, comprising the following steps:
    - Recording a combustion chamber signal (1) and creating one
    Combustion chamber signal data stream (2),
    - Simultaneous recording of a crank angle signal (3) and creation of a crank angle signal data stream (4),
    Splitting or duplicating the combustion chamber signal data stream (2),
    Creating a first filtered combustion chamber signal data stream (23),
    - if necessary, creating a second filtered combustion chamber signal data stream (24),
    - Creating a first transformed combustion chamber signal data stream (20) by transforming (8) the first filtered combustion chamber signal data stream (23) from the time base on a crank angle basis and creating a second transformed combustion chamber signal data stream (21) by transforming (9) the second optionally filtered combustion chamber signal data stream (24) from the time base crank angle base,
    - Composing the transformed combustion chamber signal data streams (20, 21) so that the output data stream transformed the first transformed combustion chamber signal data stream (20) in a first crank angle range (17) and the second transformed in a second crank angle range (19)
    Combustion chamber signal data stream (21) comprises.
    Fig. 1
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    Method for creating an interference-free combustion chamber signal data stream
    The invention relates to a method according to the preamble of the independent claim.
    For the analysis of combustion processes of internal combustion engines, it is known
    Record combustion chamber signals via sensors and subsequently evaluate them. In measurements on internal combustion engines, however, it is almost inevitable that the combustion chamber signal is disturbed by interference, which means that the received signal or the data generated from it must be suppressed.
    For analysis and optimization of the combustion processes of internal combustion engines and, if necessary, also for control device data, the pressure profiles in the interior of the cylinders are recorded, for example, using suitable pressure transducers, charge amplifiers and fast data acquisition systems. Due to the not always ideally possible installation of the pressure sensors as well as external influences such as structure-borne noise signals or structure-borne noise vibrations, caused e.g. By closing the valves, the measured pressure curve is subject to various interfering influences, which affect the accuracy of the evaluations. For this reason, it is known to subject the cylinder pressure signal to filtering.
    However, such a filtering also filters out any knocking vibrations superimposed on the cylinder pressure and high pressure gradients, such as occur in the case of pre-ignition, and thus reduces their amplitude. Incorrect detection of these phenomena creates the risk of thermally overloading the motor and thus damaging it. Likewise, a reduction in the pressure gradient prevents the combustion noise from being correctly determined.
    Since these phenomena occur primarily in the area around the maximum pressure, one way of avoiding the side effects mentioned above is to not filter the signal uniformly over the entire crank angle range.
    It is known, for example, that the cylinder pressure signal is first digitized in a time-synchronized manner, then converted on an angular basis and then smoothed by weighted averaging, whereby the weight function and the window width for this sliding averaging can be varied via the crank angle.
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    However, since this is a smoothing method that is applied to a signal transformed to crank angle, this has the significant disadvantage that neither an exact filter characteristic nor an exact cutoff frequency can be specified, since the time interval between the crank angle positions and the Speed changes.
    According to a further known method, a crank angle-dependent filtering of the cylinder pressure curve is carried out, which is adapted to specific disturbance variables, but the crank angle information is in turn derived from the cylinder pressure curve. This has the disadvantage that the crank angle information is only approximately known at a certain point in time and that the instantaneous speed changes caused by the individual cylinders are completely ignored.
    In addition, since the sampling frequency on a time basis is generally much higher than on a crank angle basis, the detected combustion chamber signal loses information due to the angle-synchronous smoothing. Furthermore, the determination of the crankshaft position from a cylinder pressure curve analysis is severely restricted in its accuracy and cannot be used for high-quality data evaluation.
    The object of the invention is now to provide an improved method for at least partial interference suppression of a combustion chamber signal, by which the disadvantages of the prior art are overcome. In particular, it is an object of the invention to enable high-quality data evaluation of cylinder pressure signals measured in an indexing system if the cylinder pressure signals are subject to interference.
    The object of the invention is achieved in particular by the features of the independent claim.
    The invention preferably relates to a method for generating an at least partially suppressed output data stream by detecting and selectively filtering a combustion chamber signal recorded on an internal combustion engine, comprising the following steps: recording a combustion chamber signal by a combustion chamber sensor and generating a combustion chamber signal data stream by digitally synchronizing the combustion chamber signal,
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    - Simultaneously recording a crank angle signal and creating one
    Crank angle signal data stream by time-synchronized digitizing the
    Crank angle signal,
    Splitting or duplicating the combustion chamber signal data stream into a first combustion chamber signal data stream and into a second combustion chamber signal data stream,
    Creating a first filtered combustion chamber signal data stream by filtering the first combustion chamber signal data stream in a first filter,
    if necessary, creating a second filtered combustion chamber signal data stream by filtering the second combustion chamber signal data stream in a second filter,
    - Creating a first transformed combustion chamber signal data stream by transforming the first filtered combustion chamber signal data stream from a time base on a crank angle basis using the recorded
    Crank angle signal data stream and generation of a second transformed combustion chamber signal data stream by transforming the second optionally filtered combustion chamber signal data stream from time base on crank angle basis using the recorded crank angle signal data stream,
    Assembling the transformed combustion chamber signal data streams so that the output data stream comprises the first transformed combustion chamber signal data stream in a first crank angle range and the second transformed combustion chamber signal data stream in a second crank angle range.
    It may be provided that the first one is transformed
    Combustion chamber signal data stream serves as the base signal and is replaced by the second transformed combustion chamber signal data stream between specific or selectable crank angles.
    If appropriate, it can be provided that the crank angles between which the first transformed combustion chamber signal data stream is replaced by the second transformed combustion chamber signal data stream can be freely selected, and / or that the first transformed combustion chamber signal data stream serves as a base signal and values from the second transformed combustion chamber signal data stream between freely selectable crank angles in the basic signal can be adopted.
    If necessary, it can be provided that the first combustion chamber signal data stream is filtered and / or in a first filter on the basis of crank angle
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    If necessary, it can be provided that a thermodynamic zero point correction is carried out in the first crank angle range, in particular in the low-pressure part of the combustion process between 100 ° and 50 ° before top dead center.
    If appropriate, it can be provided that the second crank angle region comprises at least part of the high-pressure part or the entire high-pressure part of the combustion process.
    - And / or that the second crank angle range 30 ° before top dead center of the high pressure part to 120 ° after top dead center of the high pressure part of the combustion process.
    If necessary, it can be provided that the output data stream in
    Transition area between the first crank angle area and the second crank angle area comprises a transition data stream or is formed by the transition data stream, by means of which a steady and / or smooth transition is formed between the first transformed combustion chamber signal data stream and the second transformed combustion chamber signal data stream, the transition data stream being provided by a cross-fading function such as in particular Gaussian integral curve or a linear function is formed.
    If necessary, it can be provided that the first filter and the second filter are independent of one another and freely parameterizable.
    If necessary, it can be provided that the first filter is set up to carry out a basic smoothing of the combustion chamber signal or the first combustion chamber signal data stream in the low-pressure part of the combustion process and / or that the first filter is set up to filter relevant disturbances such as mechanical disturbances or structure-borne noise caused by valve closing.
    If necessary, it can be provided that the second filter is set up for this purpose in the high-pressure part of the combustion process, in particular through the sensor assembly
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    If necessary, it can be provided that the filter or filters is or are designed as a low-pass filter, band-pass filter, band-stop filter or as a filter for numerical smoothing.
    If necessary, it can be provided that the first filter is a low-pass filter, or that the first filter is a low-pass filter with a cutoff frequency of 1 kHz to 5 kHz.
    If necessary, it can be provided that the second filter is a low-pass filter or that the second filter is a low-pass filter with a cut-off frequency of 20 kHz to 100 kHz.
    It may be provided that the filter or filters is or are set up to filter the respective combustion chamber signal data stream in real time.
    It can optionally be provided that the combustion chamber signal is on
    Cylinder pressure signal of the combustion chamber, or a pressure signal from a
    Combustion chamber pressure sensor of an indexed engine.
    If necessary, it can be provided that the filter runtimes of the filtered combustion chamber signal data stream or of the filtered combustion chamber signal data streams are compensated, and / or that the transformation on a crank angle basis and the compensation of the filter runtimes are carried out in one step, in particular at the same time.
    If appropriate, it can be provided that the crank angle signal corresponds to a crank angle profile that is recorded by means of a crank angle sensor.
    If necessary, provision can be made for the time-synchronized digitization to be carried out in each case by an A / D converter, the A / D converter being in particular an 18-bit converter with a sampling rate of 2 MHz.
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    If necessary, it can be provided that the filter or filters are digital filter stages, in particular digital filter stages of the type FlR (Finite Impulse Response Filter).
    If necessary, provision can be made for the output data stream to be generated in real time, in particular in real time, however, after the filter runtime to be compensated.
    If necessary, it can be provided that the creation of the output data stream takes place in real time, in particular delayed by the filter runtime to be compensated, and that a digital signal processor or an FPGA ("Free Programmable Gate Array") is used to compose the transformed combustion chamber signal data streams into the output data stream.
    If necessary, it can be provided that the method comprises the following steps:
    Splitting or duplicating the combustion chamber signal data stream into a first combustion chamber signal data stream, into a second combustion chamber signal data stream and into a third or further combustion chamber signal data stream,
    optionally filtering the third or further combustion chamber signal data stream in a third or further filter,
    Creating a third or further transformed combustion chamber signal data stream by transforming the third or further optionally filtered combustion chamber signal data stream from a time base on a crank angle basis using the recorded crank angle signal data stream,
    - Composing the transformed combustion chamber signal data streams so that the output data stream is formed in a first crank angle range by the first transformed combustion chamber signal data stream, in a second crank angle range by the second transformed combustion chamber signal data stream and in a third or further crank angle range by the third or further transformed combustion chamber signal data stream.
    If necessary, it can be provided that a freely adjustable crank angle window (z) is defined for the transition between the first transformed combustion chamber signal data stream (p1 (phi)) and the values of at least one further transformed combustion chamber signal data stream (pn (phi)), the transition according to the following regulation is carried out:
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    pr (phi) = p1 (phi) phi 1 <= phi <= phi 1 + z: pr (phi) = p1 (phi) * (1 -u (phi-phi 1)) + pn (phi) * u ( phi-phi 1) phi1 + z <phi <phin:
    pr (phi) = pn (phi) phin <= phi <= phin + m: pr (phi) = pn (phi) * (1 -u (phi-phin)) + p1 (phi) * (u (phi- phin)) phi> phin + m:
    pr (phi) = p1 (phi) where phi is the crank angle, where phi 1 is the first, freely adjustable, crank angle, where phin is another, freely adjustable, crank angle, where p1 (phi) is the first transformed combustion chamber signal data stream, where pn (phi) is a further transformed combustion chamber signal data stream, where u is the transition function forming the transition data stream, and where z is a first freely adjustable crank angle window, and where m is another freely adjustable crank angle window, and where pr is the output data stream.
    According to a first exemplary embodiment, the use of a filter, in particular a digital filter, is proposed, which is only used in a specific predeterminable crank angle range. The interference vibrations caused by the valve closing occur approximately in a range of 120 ° before TDC (top dead center). A range from 100 ° to 50 ° before TDC is typically used for a thermodynamic zero point correction that requires interference-free data. The maximum pressure gradient and knocking vibrations, however, only occur around the TDC and afterwards. It is therefore advantageous to let the low-pass filter act only up to about 30 ° before TDC and then switch it off. However, the sudden deactivation of a filter typically leads to discontinuities in the signal curve. To avoid this, a steady or smooth transition between the filtered and unfiltered signal is provided. A so-called cross-fade function (e.g. a Gaussian integral curve) is used and a crank angle range is defined for the transition:
    Is the pressure given by the function p (phi) and the low-pass filtered pressure curve by pfilt (phi) and the crossfade function by u (x); where u (0) = 0 and u (z) = 1; the following applies to the corrected pressure curve pk (phi):
    For phi <phi1: pk (phi) = pfilt (phi)
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    For phi1 <= phi <= phi1 + z: pk (phi) = pfilt (phi) * (1 -u (phi-phi1)) + p (phi) * u (phi-phi1)
    For phi> phi1 + z: pk (phi) = p (phi)
    According to the first or a further exemplary embodiment, the high-frequency data stream supplied by an A / D converter (for example 18 bits with a 2 MHz sampling rate) is conducted into two mutually independent digital filter stages (for example of the FlR type), the types and limit frequencies of which are used by the end user Measuring system can be freely defined. It can e.g. deal with low passes or band locks. The latter are e.g. then advantageous if narrow-band resonances that depend on the mounting of the sensor occur in the high-pressure part of the cylinder pressure curve. Following this filtering, the data is transformed to crank angle using the signals from a crank angle sensor. In this step, the filter runtimes that are unavoidable due to the real-time calculation of the digital filters are taken into account and compensated for, so that the filters do not result in any signal shifts over the crank angle axis even at different speeds. Following this, the two generated signal waveforms that are dependent on the crank angle are combined again into a single waveform. The curve filtered with the first filter, in particular the basic filter, preferably serves as the basic course. From a certain crank angle phi 1 which can be freely defined by the user, the values of the second curve are adopted for the result signal and from a further also freely definable crank angle phi2 from the first curve.
    In order to avoid discontinuities at the transition points, however, a hard changeover is preferably not carried out, but rather a smooth transition between the curves filtered with the first filter and the curves filtered with the second filter. For this purpose, a cross-fade function (e.g. a Gaussian integral curve) is used and a crank angle window (s) is defined for the transition:
    If the pressure curve filtered with filter 1 is given by the function p1 (phi) and the pressure curve filtered with filter 2 is given by p2 (phi) and the fade function by u (x), where u (0) = 0 and u (z) = Must be 1, the following applies to the resulting pressure curve pr (phi):
    For phi <phi 1: pr (phi) = p1 (phi)
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    For phi 1 <= phi <= phi 1 + z: pr (phi) = p1 (phi) * (1 -u (phi-phi 1)) + p2 (phi) * u (phi-phi 1)
    For phi1 + z <phi <phi2: pr (phi) = p2 (phi)
    For phi2 <= phi <= phi2 + z: pr (phi) = p2 (phi) * (1 -u (phi-phi2)) + p1 (phi) * (u (phi-phi2))
    For phi> phi2 + z: pr (phi) = p1 (phi)
    Examples of a possible crossfade function u (phi) would be e.g. a linear function or a Gaussian integral curve.
    The method for creating the filtered curve of a cylinder pressure curve may include the steps that the digitized pressure curve is guided through two digital filter stages that can be freely parameterized with regard to type and cutoff frequency, the output curves of which are then combined again into a resulting new pressure curve, the values being in front of a definable crank angle the output profile of the first filter, then the values of the output profile of the second filter and then again the values of the output profile of the first filter.
    It is preferably provided that a smooth switching between the
    Output curves of the digital filter is carried out using a crossfade function. Here, digital filtering, the conversion of the filtered data from time base to crank angle and the compilation of the output curves into a resulting crank angle-dependent curve in real time is preferably carried out in a digital signal processor or FPGA ("Free Programmable Gate Array").
    An exemplary embodiment of the invention is described in more detail below with reference to the figure.
    1 shows a schematic representation of the sequence of a method for creating an interference-free or at least partially interference-free combustion chamber signal data stream.
    Unless otherwise stated, the reference symbols correspond to the following features: combustion chamber signal 1, combustion chamber signal data stream 2, crank angle signal 3, crank angle signal data stream 4, first filter 5, second filter 6, third filter 7,
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    Transformation (of the first combustion chamber signal data stream) 8, transformation (of the second combustion chamber signal data stream) 9, transformation (of the third combustion chamber signal data stream) 10, parameter 11, composition (of the output data stream) 12, disturbed signal 13, high-frequency change in the combustion chamber signal data stream during ignition 14, suppressed output data stream 15 Transition data stream 16, first crank angle region 17, transition region 18, second crank angle region 19, first transformed combustion chamber signal data stream 20, second transformed combustion chamber signal data stream 21, third transformed combustion chamber signal data stream 22, first filtered combustion chamber signal data stream 23, second optionally filtered combustion chamber signal data stream 24, third possibly first combustion data signal stream 26, third optionally filtered data stream 26 , second combustion chamber signal data stream 27, third combustion chamber signal data stream 28.
    1, a combustion chamber signal 1 is recorded in a first step.
    This combustion chamber signal 1 can be, for example, a pressure signal recorded via a pressure sensor or another signal. The output signal of a knock sensor or the output signal of a temperature sensor would also be possible. In the present, preferred embodiment, the invention is carried out by way of example on the basis of a pressure signal, in particular on the basis of a pressure signal of the combustion chamber pressure sensor of an indexed engine.
    The recorded combustion chamber signal 1 is converted into a combustion chamber signal data stream 2. This conversion takes place in particular by digitizing, preferably by time-synchronizing digitizing, for example in an A / D converter.
    At the same time, for example via a crank angle sensor
    Crank angle signal 3 recorded and subsequently digitized. This conversion of the crank angle signal 3 into a crank angle signal data stream 4 takes place in particular by high-frequency, time-synchronized digitizing, for example by scanning, counting and interpolating the pulses of an angle marker. This digitization can take place, for example, in an A / D converter.
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    For further processing of the combustion chamber signal data stream 2, it is split and / or duplicated into a first combustion chamber signal data stream 26 and into a second combustion chamber signal data stream 27. The splitting into a first combustion chamber signal data stream 26 and a second combustion chamber signal data stream 27 enables the independent processing of the combustion chamber signal data stream 2 in two different method steps. In this way, the first combustion chamber signal data stream 26 is filtered in a first filter 5 without influencing the second combustion chamber signal data stream 27.
    The first filter 5 can be a low-pass filter, a band-pass filter or a band-stop filter, for example. In the present embodiment, the first filter 5 is designed as a low-pass filter, preferably as a low-pass filter with a cutoff frequency of 1 kHz to 5 kHz. Furthermore, the first filter 5 is used for basic interference suppression. In particular, it is the task of the first filter 5 in the present embodiment to filter the faults 13 of the combustion chamber signal 1 caused by the valve closing of the valves of the internal combustion engine. These are relative high-frequency interference, which can be removed from the combustion chamber signal 1 or from the combustion chamber signal data stream 2 by the low-pass filter.
    Subsequently, a transformation 8 of the first filtered takes place
    Combustion chamber signal data stream 23 takes place from a time base on a crank angle basis, the crank angle signal data stream 4 used for this being the data of the crank angle signal 3. According to the present embodiment, the filter runtimes are also compensated for in transformation 8. These filter runtimes arise, in particular due to the real-time calculation of the, in particular digital, filters. As a result of this compensation, there are no signal shifts over the crank angle axis even at different speeds.
    Likewise, according to a preferred embodiment, the second one
    Combustion chamber signal data stream 27 are filtered in a second filter 6 and / or numerically smoothed. This filtering or smoothing in the second filter 6 is preferably carried out in parallel and therefore independently of the filtering of the first
    Combustion chamber signal data stream 26 in the first filter 5. Optionally, according to a further embodiment, the second combustion chamber signal data stream 27 can also be passed on unfiltered. In the present embodiment, the second filter 6 is as
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    Low-pass filter, preferably a low-pass filter with a cut-off frequency of 20 kHz to 100 kHz. Furthermore, the second filter 6 serves for any additional interference suppression.
    Subsequently, a transformation 9 of the second, optionally filtered, combustion chamber signal data stream 24 is carried out from a time base on a crank angle basis. In the case of the transformation 9, the filter runtimes are also preferably equalized.
    The same happens with the transformation 8 of the first filtered
    Combustion chamber signal data stream 23 from a time base on a crank angle basis.
    Optionally, a third, possibly filtered, combustion chamber signal data stream 25 is provided, which is created by filtering a third combustion chamber signal data stream 28 in a third filter 7. This third filtered, if necessary
    Combustion chamber signal data stream 25 is transformed in a transformation 10 from time base to crank angle base. In the transformation 10, the filter runtimes are preferably also compensated.
    In a further step, an output data stream 15 is formed by combining 12. According to the present embodiment, this output data stream comprises parts or a part of the first transformed combustion chamber signal data stream 20 and the second transformed combustion chamber signal data stream 21. In particular, the output data stream 15 comprises at least a part of the first transformed combustion chamber signal data stream 20 and at least a part of the second transformed combustion chamber signal data stream 21 First crank angle range 17 is provided, in which the output data stream 15 corresponds to the first transformed combustion chamber signal data stream 20. Furthermore, a second crank angle range 19 is provided, in which the output data stream 15 corresponds to the second transformed combustion chamber signal data stream 21. The first crank angle region 17 preferably includes that region in which a fault to be filtered or eliminated occurs. In the present case, the first crank angle region 17 comprises the low-pressure part of the combustion process and the region in which the valves of the corresponding cylinder of the internal combustion engine are closed. The disturbed signal 13, which is only shown for better understanding, is transformed by the first according to the present method
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    Combustion chamber signal data stream 20, which was filtered in the first filter 5, is replaced, so that the interference is eliminated and the output data stream 15 is or is suppressed. In the second crank angle region 19, on the other hand, the output data stream 15 is formed by the second transformed combustion chamber signal data stream 21, which also maps high-frequency combustion chamber signals such as, for example, high-frequency changes in the combustion chamber signal data stream by knocking combustion 14 and / or any disturbances caused by the sensor assembly. In the present case, the second crank angle region 19 comprises the high-pressure part of the combustion process.
    Through this assembly 12 different filtering or smoothing are carried out depending on the crank angle range, the
    Crank angle ranges can be determined or selected by parameter 11.
    In order to avoid discontinuities in the output data stream 15, a transition region 18 with a transition data stream 16 is arranged between two transformed combustion chamber signal data streams 20, 21 arranged in a row. In particular, the transition data stream 16 is suitable and / or set up to bring about a steady course of the output data stream 15 between the two transformed combustion chamber signal data streams 20, 21 strung together. The transition data stream 16 can be, for example, a Gaussian integral curve, the boundary conditions of which correspond to the boundary conditions of the combustion chamber signal streams joined together.
    In all embodiments it can be provided that the filters are set up to filter and / or numerically smooth the combustion chamber signal data streams before the transformation on a crank angle basis.
    In all embodiments, it can be provided that the first transformed combustion chamber signal data stream corresponds to a first filtered and / or smoothed and transformed combustion chamber signal data stream.
    In all embodiments it can be provided that the second, third and further transformed combustion chamber signal data stream correspond to a second, third and further optionally filtered and / or optionally smoothed and transformed combustion chamber signal data stream.
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    In all embodiments, it can be provided that the high-pressure part of the combustion process corresponds to the high-pressure region of the combustion process.
    In all embodiments, it can be provided that the low-pressure part of the combustion process corresponds to the low-pressure region of the combustion process.
    In all embodiments it can be provided that the output data stream is formed in a first crank angle range by the first transformed combustion chamber signal data stream and in a second crank angle range by the second transformed combustion chamber signal data stream.
    According to a further embodiment of the method, the
    Combustion chamber signal data stream in two, three, four, five, six or more
    Combustion chamber signal data streams split or reproduced.
    According to a further embodiment of the method, the first, second, third, fourth, fifth, sixth or further combustion chamber signal data streams which are split or reproduced from the combustion chamber signal data stream are filtered or smoothed in an associated first, second, third, fourth, fifth, sixth or further filter.
    According to a further embodiment of the method, the filtered or optionally filtered first, second, third, fourth, fifth, sixth or further combustion chamber signal data streams are transformed in a corresponding first, second, third, fourth, fifth, sixth or further transformation from time base to crank angle basis.
    According to a further embodiment of the method, the
    Output data stream Parts or a part of a first, second, third, fourth, fifth, sixth or further transformed combustion chamber signal data stream or is formed by this / n.
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    权利要求:
    Claims (21)
    [1]
    claims
    1. Method for creating an at least partially interference-free
    Output data stream (15) by detecting and selectively filtering one at a time
    Combustion chamber signal (1) recorded by the internal combustion engine, comprising the following steps:
    Recording a combustion chamber signal (1) by a combustion chamber sensor and creating a combustion chamber signal data stream (2) by digitizing the combustion chamber signal (1) in a time-synchronized manner,
    - Simultaneous recording of a crank angle signal (3) and creation of a crank angle signal data stream (4) by time-synchronized digitization of the crank angle signal (3),
    Splitting or duplicating the combustion chamber signal data stream (2) into a first combustion chamber signal data stream (26) and into a second combustion chamber signal data stream (27),
    - Creating a first filtered combustion chamber signal data stream (23) by filtering the first combustion chamber signal data stream (26) in a first filter (5),
    - if necessary, creating a second filtered combustion chamber signal data stream (24) by filtering the second combustion chamber signal data stream (27) in a second filter (6),
    - Creating a first transformed combustion chamber signal data stream (20) by transforming (8) the first filtered combustion chamber signal data stream (23) from a time base on a crank angle basis using the recorded crank angle signal data stream (4) and creating a second transformed combustion chamber signal data stream (21) by transforming (9) the second one if necessary filtered combustion chamber signal data stream (24) from the time base on a crank angle basis using the
    Crank angle signal data stream (4),
    - Composing the transformed combustion chamber signal data streams (20, 21) so that the output data stream transformed the first transformed combustion chamber signal data stream (20) in a first crank angle range (17) and the second transformed in a second crank angle range (19)
    Combustion chamber signal data stream (21) comprises.
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    [2]
    2. The method according to claim 1, characterized in that the first transformed combustion chamber signal data stream (20) serves as a base signal and is replaced by the second transformed combustion chamber signal data stream (21) between certain or selectable crank angles.
    [3]
    3. The method according to any one of claims 1 to 2, characterized in that the crank angles between which the first transformed combustion chamber signal data stream (20) is replaced by the second transformed combustion chamber signal data stream (21) are freely selectable, and / or that the first transformed combustion chamber signal data stream (20) serves as the base signal and values from the second transformed combustion chamber signal data stream (21) between freely selectable crank angles are adopted in the base signal.
    [4]
    4. The method according to any one of claims 1 to 3, characterized in that the first combustion chamber signal data stream (26) is filtered and / or numerically smoothed before transformation (8) on a crank angle basis in a first filter (5), and / or that the second combustion chamber signal data stream (27) is filtered and / or numerically smoothed before transformation (9) on a crank angle basis in a second filter (6).
    [5]
    5. The method according to any one of claims 1 to 4, characterized in that in the first crank angle range (17), in particular in the low-pressure part of the combustion process between 100 ° and 50 ° before top dead center, a thermodynamic zero point correction is carried out.
    [6]
    6. The method according to any one of claims 1 to 5, characterized in that the second crank angle region (19) comprises at least a part of the high pressure part or the entire high pressure part of the combustion process,
    - And / or that the second crank angle region (19) 30 ° before top dead center of the high pressure part to 120 ° after top dead center of the high pressure part of the combustion process.
    [7]
    7. The method according to any one of claims 1 to 6, characterized in that the output data stream in the transition region (18) between the first
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    Crank angle range (17) and the second crank angle range (19) comprises a transition data stream (16) or is formed by the transition data stream (16), through which a steady and / or smooth transition between the first transformed combustion chamber signal data stream (20) and the second transformed combustion chamber signal data stream ( 21) is formed, the transition data stream (16) being formed by a crossfade function such as, in particular, a Gaussian integral curve or a linear function.
    [8]
    8. The method according to any one of claims 1 to 7, characterized in that the first filter (5) is set up to provide a basic smoothing of the combustion chamber signal (1) or the first in the low-pressure part of the combustion process
    Carrying out combustion chamber signal data stream (26) and / or that the first filter (5) is set up to filter relevant faults such as mechanical faults or structure-borne noise caused by valve closing.
    [9]
    9. The method according to any one of claims 1 to 8, characterized in that the second filter (6) is set up to filter in the high-pressure part of the combustion process, in particular interference caused by the sensor assembly, but to allow other vibrations such as knock vibrations to pass.
    [10]
    10. The method according to any one of claims 1 to 9, characterized in that the first filter (5) is a low-pass filter, preferably a low-pass filter with a cut-off frequency of 1 kHz to 5 kHz and / or that the second filter (6) is a low-pass filter, is preferably a low-pass filter with a cut-off frequency of 20 kHz to 100 kHz.
    [11]
    11. The method according to any one of claims 1 to 10, characterized in that the filter or filters (5, 6, 7) is or are set up to filter the respective combustion chamber signal data stream (26, 27, 28) in real time.
    [12]
    12. The method according to any one of claims 1 to 11, characterized in that the combustion chamber signal (1) is a cylinder pressure signal of the combustion chamber, or a pressure signal of a combustion chamber pressure sensor of an indexed engine.
    [13]
    13. The method according to any one of claims 1 to 12, characterized in that the filter runtimes of the filtered combustion chamber signal data stream or
    18/21
    PI30918AT
    AVL List GmbH filtered combustion chamber signal data streams (23, 24, 25) are compensated, and / or that the transformation (8, 9, 10) on a crank angle basis and the compensation of the filter runtimes are carried out in one step, in particular at the same time.
    [14]
    14. The method according to any one of claims 1 to 13, characterized in that the crank angle signal (3) corresponds to a crank angle profile, which is recorded by means of a crank angle sensor.
    [15]
    15. The method according to any one of claims 1 to 14, characterized in that the time-synchronized digitization is carried out in each case by an A / D converter, the A / D converter being in particular an 18 bit converter with a sampling rate of 2 MHz.
    [16]
    16. The method according to any one of claims 1 to 15, characterized in that the filter or filters are digital filter stages, in particular digital filter stages of the type FlR (Finite Impulse Response Filter).
    [17]
    17. The method according to any one of claims 1 to 16, characterized in that the creation of the output data stream in real time, in particular in real time, however, is delayed by the filter runtime to be compensated.
    [18]
    18. The method according to any one of claims 1 to 17, characterized in that the creation of the output data stream in real time, in particular delayed by the filter runtime to be compensated, and that the composition of the transformed
    Combustion chamber signal data streams (20, 21) to the output data stream a digital signal processor or an FPGA ("Free Programmable Gate Array") is used.
    [19]
    19. The method according to any one of claims 1 to 18, comprising the following steps:
    Splitting or duplicating the combustion chamber signal data stream into a first combustion chamber signal data stream (26), into a second combustion chamber signal data stream (27) and into a third (28) or further combustion chamber signal data stream,
    optionally filtering the third (28) or further combustion chamber signal data stream in a third (7) or further filter,
    19/21
    PI30918AT
    AVL List GmbH
    - Create a third (22) or more transformed
    Combustion chamber signal data stream by transforming (10) the third or further optionally filtered combustion chamber signal data stream from a time base on a crank angle basis using the recorded
    Crank angle signal data stream (4),
    - Composing (12) the transformed combustion chamber signal data streams (20, 21, 22) so that the output data stream in a first crank angle range (17) by the first transformed combustion chamber signal data stream (20), in a second crank angle range (19) by the second transformed combustion chamber signal stream (21) and is formed in a third or further crank angle range by the third (22) or further transformed combustion chamber signal data stream.
    [20]
    20. The method according to any one of claims 1 to 19, characterized in that for the transition between the first transformed
    Combustion chamber signal data stream (20) (p1 (phi)), and the values of at least one further transformed combustion chamber signal data stream (21, 22) (pn (phi)), a freely adjustable crank angle window (z) is determined, the transition being carried out in accordance with the following regulation:
    phi <phi 1: pr (phi) = p1 (phi) phi 1 <= phi <= phi 1 + z: pr (phi) = p1 (phi) * (1 -u (phi-phi 1)) + pn ( phi) * u (phi-phi 1) phi 1 + Z <phi <phin: pr (phi) = pn (phi) phin <= phi <= phin + m: pr (phi) = pn (phi) * (1 -u (phi-phin)) + p1 (phi) * (u (phi-phin)) phi> phin + m: pr (phi) = p1 (phi) where phi is the crank angle, where phi 1 is the first, free adjustable crank angle, where phin is a further, freely adjustable crank angle, where p1 (phi) is the first transformed combustion chamber signal data stream (20), where pn (phi) is another transformed combustion chamber signal data stream (21, 22), u u den den Transition data stream (16) is a cross-fading function and where z is a first freely adjustable crank angle window and where m is a further freely adjustable crank angle window and where pr is the output data stream.
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    [21]
    21/21
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    同族专利:
    公开号 | 公开日
    AT518869B1|2018-02-15|
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    CN109790793A|2019-05-21|
    JP2019529809A|2019-10-17|
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    JP6695510B2|2020-05-20|
    WO2018060339A1|2018-04-05|
    US10774758B2|2020-09-15|
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    JP4375331B2|2005-12-26|2009-12-02|株式会社デンソー|Knock sensor signal processing device|
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    US7606655B2|2006-09-29|2009-10-20|Delphi Technologies, Inc.|Cylinder-pressure-based electronic engine controller and method|
    DE102008032935B4|2008-07-12|2019-06-27|Volkswagen Aktiengesellschaft|Method for calculating a combustion chamber pressure in real time|
    JP5546595B2|2012-08-07|2014-07-09|三菱電機株式会社|Knock control device for internal combustion engine|
    DE102014223070A1|2014-11-12|2016-05-12|Robert Bosch Gmbh|Method for conditioning a signal of a combustion chamber pressure sensor|
    DE102015203637A1|2015-03-02|2016-09-08|Robert Bosch Gmbh|Method and device for determining a signal offset between a crankshaft angle signal and a combustion chamber pressure signal in an internal combustion engine|US11047318B2|2018-06-13|2021-06-29|Chad Alan Michaelis|Fuel testing data acquisition system calibrator and signal simulator|
    法律状态:
    2019-03-15| HA| Change or addition of new inventor|Inventor name: GARY PATTERSON, US Effective date: 20190115 Inventor name: JOSEF MOIK, AT Effective date: 20190115 |
    优先权:
    申请号 | 申请日 | 专利标题
    ATA50874/2016A|AT518869B1|2016-09-28|2016-09-28|Method for creating a suppressed combustion chamber signal data stream|ATA50874/2016A| AT518869B1|2016-09-28|2016-09-28|Method for creating a suppressed combustion chamber signal data stream|
    JP2019537885A| JP6695510B2|2016-09-28|2017-09-28|Method for forming an unobstructed combustion chamber signal data stream|
    PCT/EP2017/074646| WO2018060339A1|2016-09-28|2017-09-28|Method for producing a combustion space signal data stream with interference suppression|
    EP17777039.3A| EP3519687A1|2016-09-28|2017-09-28|Method for producing a combustion space signal data stream with interference suppression|
    CN201780059825.2A| CN109790793A|2016-09-28|2017-09-28|For generating the method for removing the combustion chamber signal data stream of interference|
    US16/336,474| US10774758B2|2016-09-28|2017-09-28|Method for producing a combustion space signal data stream with interference suppression|
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