KR20140010327A - Method and system for performing selective engine parameter analysis - Google Patents

Abstract

An apparatus for performing a selective engine parameter analysis about at least one engine parameter of a combustion engine includes: a detection unit which detects a cylinder pressure in the combustion chamber of the combustion engine in order to generate a cylinder pressure signal; a signal processing unit which processes the cylinder pressure signal which is generated for different phases of the engine cycle of the combustion engine in order to provide a cylinder pressure differential signal and/or a cylinder pressure integral signal for each phase of the engine cycle; and a calculation unit which evaluates the generated cylinder pressure signal, processed cylinder pressure differential signal, and/or cylinder pressure integral signal of at least one selected phase of the engine cycle which is related to each engine parameter and then obtains an optimal correlation between an engine parameter signal which is outputted by an engine parameter sensor and the evaluated signals or between an engine parameter signal which is calculated according to engine parameter prediction models and the evaluated signals.

Description

METHOD AND SYSTEM FOR PERFORMING SELECTIVE ENGINE PARAMETER ANALYSIS}

The present invention relates to a method and apparatus for performing selective engine parameter analysis for at least one engine parameter of a combustion engine.

A typical vehicle is provided with physical sensors to obtain special information data for modern control concepts of the combustion engine of each vehicle. Since there are many engine parameters measured by engine parameter sensors, the complexity of the system increases. Furthermore, physical sensors age and change over their lifetime. Physical sensors have measurement errors caused by external influences or manufacturing processes. These errors and variations result in reduced accuracy of the prediction based on the sensor data.

Accordingly, the present invention was created to solve the above problems, and an object of the present invention is to provide a method and apparatus for increasing the accuracy of prediction without increasing the complexity of the apparatus.

The object of the invention is achieved by a method comprising the steps of claim 1.

Accordingly, the present invention provides a method for performing selective engine parameter analysis for at least one engine parameter of a combustion engine,

(a) detecting the cylinder pressure in the combustion chamber of the combustion engine to produce a cylinder pressure signal;

(b) processing the generated cylinder pressure signal for different phases of the engine cycle of the combustion engine to provide a cylinder pressure differential signal and / or a cylinder pressure integration signal for each phase of an engine cycle; And

(c) evaluating the generated cylinder pressure signal, the processed cylinder pressure differential signal and / or the cylinder pressure integral signal of at least one selected phase of the engine cycle associated with each engine parameter to evaluate the evaluated signals and engine parameter sensor Obtaining an optimal correlation between the engine parameter signals outputted by or between the evaluated signals and an engine parameter signal calculated according to an engine parameter prediction model;

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In the method according to an embodiment of the invention, if the obtained correlation between the evaluated signals and the engine parameter signal output by the engine parameter sensor provided for each engine parameter is high, then The engine parameter signal is supplied to the engine control unit of the combustion engine.

In the method according to an embodiment of the present invention, if the obtained correlation between the evaluated signals and the engine parameter signal output by the engine parameter sensor provided for each engine parameter is low, a sensor change correction is performed. Including error handling is performed.

In the method according to an embodiment of the present invention, if the obtained correlation between the evaluated signals and an engine parameter signal calculated according to a preset engine parameter prediction model is high, the calculated engine parameter signal is obtained from the combustion engine. Output to the engine control unit.

In a method according to an embodiment of the invention, the cylinder pressure signal is processed for different phases of the engine cycle of the combustion engine to provide a heat dissipation information signal.

In a method according to an embodiment of the present invention, an optimum between the evaluated signals and engine parameter signals output by an engine parameter sensor or between an engine parameter signal calculated according to the evaluated signals and an engine parameter prediction model The heat dissipation information signal is evaluated for at least one selected phase of the engine cycle associated with each engine parameter to obtain correlation.

In the method according to an embodiment of the present invention, the evaluation of the generated cylinder pressure signal, the processed cylinder pressure differential signal and / or the cylinder pressure integration signal, and / or the processed heat dissipation information signal is performed by a calculating unit. It is performed by neural network software.

In the method according to an embodiment of the present invention, the phase of the engine cycle in which the generated cylinder pressure signal is processed includes a compression phase, a combustion phase, an expansion phase and a gas exchange phase.

In a method according to an embodiment of the invention, the compression phase comprises an engine comprising air mass, boost pressure, boost temperature, combustion noise, air cleaner service monitor and on board diagnostics (OBD) backup for selected parameters. Selected to be associated with at least one or more of the parameters.

In a method according to an embodiment of the present invention, the combustion phase comprises a combustion delay, exhaust gas recirculation (EGR) ratio, NOx emissions, soot formation, peak firing pressure, combustion noise and selected parameters. And selected to be associated with at least one of the engine parameters including an OBD backup.

In a method according to an embodiment of the invention, the expansion phase is an engine parameter including exhaust pressure, exhaust temperature, turbocharger speed, soot formation, diesel particulate filter (DPF) status and OBD backup for selected parameters. Selected from at least one of them.

In a method according to an embodiment of the invention, the gas exchange phase is selected to be associated with at least one or more of the engine parameters including exhaust pressure, turbocharger speed, DPF status and OBD backup for the selected parameter.

The invention further provides an apparatus for performing selective engine parameter analysis comprising the features of claim 12.

Accordingly, the present invention provides an apparatus for performing selective engine parameter analysis for at least one engine parameter of a combustion engine,

(a) a detection unit configured to detect a cylinder pressure in a combustion chamber of the combustion engine to generate a cylinder pressure signal;

(b) a signal processing unit adapted to process the generated cylinder pressure signal for different phases of the engine cycle of the combustion engine to provide a cylinder pressure differential signal and / or a cylinder pressure integration signal for each phase of an engine cycle ; And

(c) evaluating the generated cylinder pressure signal, the processed cylinder pressure differential signal and / or the cylinder pressure integral signal of at least one or more selected phases of the engine cycle associated with each engine parameter to evaluate the evaluated signals and engine parameter sensor A calculation unit configured to obtain an optimal correlation between the engine parameter signals outputted by or the engine parameter signals calculated according to the evaluated signals and the engine parameter prediction model;

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In the apparatus according to the invention, the calculation unit is output by the engine parameter sensor if the obtained correlation between the evaluated signals and the engine parameter signal output by the engine parameter sensor provided for each engine parameter is high. The engine parameter signal is adapted to be supplied to the engine control unit of the combustion engine.

In the apparatus according to the invention, the calculation unit comprises a sensor change correction if the obtained correlation between the evaluated signals and an engine parameter signal output by an engine parameter sensor provided for each engine parameter is low. It is designed to perform error handling.

The invention further provides a vehicle combustion engine comprising the features of claim 15.

Accordingly, the present invention provides a vehicle combustion engine comprising an apparatus for performing selective engine parameter analysis for at least one engine parameter of a combustion engine, the apparatus performing selective engine parameter analysis,

(a) a detection unit configured to detect a cylinder pressure in a combustion chamber of the combustion engine to generate a cylinder pressure signal;

(b) a signal processing unit adapted to process the generated cylinder pressure signal for different phases of the engine cycle of the combustion engine to provide a cylinder pressure differential signal and / or a cylinder pressure integration signal for each phase of an engine cycle ; And

(c) evaluating the generated cylinder pressure signal, the processed cylinder pressure differential signal and / or the cylinder pressure integral signal of at least one or more selected phases of the engine cycle associated with each engine parameter to evaluate the evaluated signals and engine parameter sensor A calculation unit configured to obtain an optimal correlation between the engine parameter signals outputted by or the engine parameter signals calculated according to the evaluated signals and the engine parameter prediction model;

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According to the method according to the invention, the accuracy of sensor data prediction can be significantly improved by specially connecting well-defined combustion phases to selected physical and chemical effects.

Furthermore, according to the method according to the invention, the correlation between the sensor target parameters can also be improved.

1 is a block diagram of a system for performing selective engine parameter analysis in accordance with an embodiment of the present invention.
2 is a flowchart of a method for performing selective engine parameter analysis for at least one engine parameter of a combustion engine according to an embodiment of the present invention.
3 (a), (b) is a view showing a process of processing the generated cylinder pressure signal performed by the method according to an embodiment of the present invention shown in FIG.
4 is a schematic diagram of a combustion engine to which a method of performing selective engine parameter analysis according to an embodiment of the present invention is applied.
5 is a table showing engine parameters related to different phases of an engine cycle used by a method and apparatus according to an embodiment of the invention.
6, 7, 8 and 9 show the phases of four different engine cycles in which a cylinder pressure signal is processed by a method of performing selective engine parameter analysis according to an embodiment of the invention.

DETAILED DESCRIPTION A method and apparatus according to an embodiment of the present invention for performing selective engine parameter analysis for at least one engine parameter of a combustion engine is described in more detail with reference to the accompanying drawings.

As shown in FIG. 1, an apparatus 1 for performing selective engine parameter analysis for at least one engine parameter EP, in an embodiment, produces a cylinder pressure in a combustion chamber of a combustion engine to generate a cylinder pressure signal CPS. And a detection unit 2 adapted to detect the signal CPS. The generated cylinder pressure signal CPS is transmitted to the signal processing unit 3 via a signal line. The signal processing unit 3 generates the generated cylinder pressure for different preset phases of the engine cycle of the combustion engine. The signal CPS is to be processed. The signal processing unit 3 is adapted to provide a cylinder pressure differential signal and / or a cylinder pressure integration signal for each phase PH of each engine cycle. The processing unit 3 is connected to the calculation unit 4. The calculation unit 4 is capable of generating the cylinder pressure signal as well as the processed cylinder pressure differential signal and / or cylinder pressure integration signal of at least one or more selected phases PH of the engine cycle associated with each engine parameter EP. (CPS) is to be evaluated. In this way, the calculation unit 4 obtains an optimal correlation between the evaluated signals and the engine parameter signal EPS. In a possible embodiment, the engine parameter signal EPS is calculated according to an engine parameter prediction model stored in a data store.

As shown in FIG. 1, the calculation unit 4 is adapted to supply the evanescence parameter signal EPS to the engine control unit 5 of the combustion engine via a signal line. This operation is done when the obtained correlation between the evaluated signals and the engine parameter signal EPS output by the engine parameter sensor provided for each engine parameter EP is high. Alternatively, if the obtained correlation between the evaluated signals and the engine parameter signal EPS output by the engine parameter sensor provided for each engine parameter EP is low, the calculation unit 4 In a possible embodiment, the error handling procedure is adapted. This error handling process may include sensor change correction of each engine parameter sensor.

The cylinder pressure signal CPS contains information to recognize the engine operating states. The cylinder pressure curve is monitored at every engine operating point. The curve of the cylinder pressure signal CPS is unique and can be used to classify engine combustion of the combustion engine. The cylinder pressure curve can be affected by external boundary conditions. For engine management, many engine parameters affect the cylinder pressure curve signal, including the number of outdoor pressures and temperatures, the boost pressure, the amount of each of the preliminary, main and post injections, as well as the number and timing rail pressure. These factors can be affected on the one hand by each application (cold and altitude corrections) and on the other hand by the aging of parts such as injector cocking which can lead to changes in the injection volume. As a result, the pressure curve is affected by possible aging effects. During the adaptation period of the device, the aging effects do not appear and thus the device is unaware of this kind of pressure curve changes. However, pressure curve changes appear mainly during operation in a particular field or during phases of the monitored cylinder pressure signal curve.

The cylinder pressure signal CPS is for different phases PH of the engine cycle of the combustion engine to provide cylinder pressure differential signals and / or cylinder pressure integration signals for each phase PH of each engine cycle. It is processed by the signal processing unit 3. These phases PH of the engine cycle in which the cylinder pressure signal CPS is processed are, in a possible embodiment, the compression phase PH1, combustion phase PH2, expansion phase PH3 and gas exchange phase PH4. Include. In a possible embodiment, the compression phase PH1 is comprised of engine parameters including air mass, boost pressure, boost temperature, combustion noise, air cleaner service monitor and On Board Diagnostics (OBD) backup for selected parameters. And at least one of EP). For example, the cylinder pressure signal CPS in the compression phase PH1 is shown in FIG. 6.

Combustion phase PH2 includes, for example, combustion delay, exhaust gas recirculation (EGR) ratio, NOx emissions, soot formation, peak firing pressure, combustion noise and OBD backup for selected parameters Selected to be associated with at least one or more of the engine parameters EP. An example of the cylinder pressure signal CPS in the combustion phase PH2 is shown in FIG. 7.

Further, the expansion phase PH3 includes engine parameters EP including exhaust pressure, exhaust temperature, turbocharger speed, soot formation, diesel particulate filter (DPF) status and OBD backup for sungo parameters. Is associated with at least one of. An example of the cylinder pressure signal CPS in the expansion phase PH3 is shown in FIG. 8.

Furthermore, the gas exchange phase PH4 is selected to be associated with at least one or more of the engine parameters EP including exhaust pressure, turbocharger speed, DPF status and OBD backup for the selected parameter. An example of the cylinder pressure signal CPS during the gas exchange phase PH4 is shown in FIG. 9.

The table shown in FIG. 5 shows an exemplary overview of different engine parameters EP associated with different phases PH1, PH2, PH3, PH4 of the engine cycle of the combustion engine. If an additional physical sensor is provided for each engine parameter (EP) to measure each engine parameter, it is possible to monitor whether each physical sensor is operating correctly. The correlation between the evaluated signals and the engine parameter signal output by the engine parameter sensor indicates whether each engine parameter sensor is operating correctly. Instead, it is also possible for the calculation unit 4 to obtain a correlation between the evaluated signals and the engine parameter signal EPS calculated according to the engine parameter prediction model. This engine parameter prediction model can be stored in the data store of the calculation unit 4. Furthermore, it is also possible for the calculation unit 4 to connect to the engine parameter prediction model via the data network. The evaluation of the generated cylinder pressure signal CPS and the processed cylinder pressure differential signals and / or cylinder pressure integration signals output from the signal processing unit 3, in a possible embodiment, is performed by the calculation unit 4. It can be performed by neural network software.

In a possible embodiment, the cylinder pressure signal CPS is adapted to be processed for different phases PH of the engine cycle of the combustion engine to also provide a heat dissipation information signal. This heat dissipation information signal can be evaluated by the calculating unit 4 for at least one or more selected phases of the engine cycles associated with each engine parameter. In this way, an optimal correlation between the evaluated signals and the engine parameter signal EPS output by the engine parameter sensor or between the evaluated signals and the engine parameter signal EPS calculated according to the engine parameter prediction model It is possible to get a relationship. In a possible embodiment, the evaluation of the generated cylinder pressure signal (CPS), the processed cylinder pressure differential signals and / or cylinder pressure integration signals, as well as the processed heat dissipation information signal, is carried out by the calculation unit 4. By neural network software.

With a method according to an embodiment of the invention, a special area of heat dissipation information signal calculated from pure or filtered cylinder pressure signal (CPS), their primary and / or secondary differential signals or even cylinder pressure signal (CPS) It is possible to improve the concept of general neural network logics by the division of phases and phases and to associate the signal regions of the phases of the engine with the relevant physical sensor information data having a direct or indirect effect.

With the method according to an embodiment of the present invention, it is possible to significantly improve the accuracy of neural network sensor data prediction by finally concatenating well defined engine cycle phases PH for the selected physical and chemical combustion effects, and finally It is possible to improve the correlation with the sensor target parameters. In order to avoid the undesirable effects of the cylinder pressure signal (CPS) and thereby the effects on the calculation of the engine signals, the method according to an embodiment of the present invention is particularly special and well defined of the associated engine parameters or engine parameter groups. Analyze the areas.

3 (a) and 3 (b) show an example of processing a cylinder pressure signal CPS to provide cylinder pressure differential signals for a phase PH or region of an engine cycle. The first diagram of Fig. 3 (a) shows the cylinder pressure curve detected in the combustion chamber of the combustion engine, the cylinder pressure depending on the cranking angle (CA) of the engine. This cylinder pressure signal CPS is processed to provide cylinder pressure differential signals for different phases or regions of the engine cycle. The processed cylinder pressure differential signals of at least one or more selected phases of this engine cycle associated with each engine parameter (EP) are engine parameter signals output by the evaluated signals and an engine parameter sensor or calculated according to an engine parameter prediction model. (EPS) to evaluate the correlation. In the example shown in FIG. 3, combustion noise frequencies f1, f2, f3 are detected as engine parameters of the engine.

4 shows a schematic diagram of a combustion engine in a vehicle comprising a system 1 for performing selective engine parameter analysis for at least one engine parameter EP of the combustion engine shown in FIG. 1. The combustion engine 6 shown in FIG. 4 comprises a combustion chamber 7 in which a piston 8 moves. The engine 6, in the illustrated embodiment, comprises a diesel particulate filter 8, a Diesel Oxidation Catalyst (DOC) 9 and a turbocharger 10. Furthermore, the combustion engine 6 comprises an exhaust gas recirculation (EGR) device 11 and an EGR cooler 12. Furthermore, an air box 15 having an intercooler 13, a turbocharger 14 and an air filter is provided.

In the combustion chamber 7 the cylinder pressure CP is detected in step S1 of the method shown in FIG. 2. Accordingly, the cylinder pressure CP is detected in the S1 stage in the combustion chamber 7 of the combustion engine 6 in order to generate the cylinder pressure signal CPS in the S1 stage. In step S2, the generated cylinder pressure CPS is the different phase of the engine cycle of the combustion engine 6 in order to provide cylinder pressure differential signals and / or cylinder pressure integration signals for each phase PH of the engine cycle. Is handled for them. This signal processing is performed by the signal processing unit 3 of the apparatus 1 shown in FIG. In step S3, the generated cylinder pressure signal CPS and the processed cylinder pressure differential signals and / or cylinder pressure integration signal of at least one or more selected phases PH of the engine cycle associated with each engine parameter EP Are evaluated to obtain a correlation between the evaluated signals and the engine parameter signal (EPS). The selection of the phases associated with each engine parameter can be performed based on the table shown in FIG. 5. This table can be stored in a data store to which the calculation unit 4 can access. In an embodiment, the evaluation of the generated cylinder pressure signal CPS and the processed cylinder pressure differential signals and / or the cylinder pressure integration signals and / or the processed heat dissipation information signal is performed by the calculation unit 4. Performed by software.

6, 7, 8, and 9 show four different phases: the compression phase PH1 shown in FIG. 6, the combustion phase PH2 shown in FIG. 7, the expansion phase PH3 shown in FIG. 8, and The engine cycle of the combustion engine 6 including the gas exchange phase PH4 shown in FIG. 9 is shown.

The compression phase PH1 starts at the intake valve closed, ie 180 ° CA BTDC, and in the embodiment shown, ends at the beginning of the first injection, ie approximately 0 ° CA BTDC.

The combustion phase PH2 starts with prespraying and ends with post injection as shown in FIG. 7.

Furthermore, the expansion phase PH3 starts at the post injection time point and ends with the exhaust valve opening at approximately 180 ° CA, as shown in FIG. 8.

The gas exchange phase PH4 may begin with the exhaust valve open and end with the intake valve closed.

As performed by the method according to an embodiment of the present invention, neural network selection parameter analysis can be used to replace physical sensors for respective engine parameters (EP). In particular, neural networks of selective parameter analysis can be used for turbochargers to obtain speed protection. A further possible use of neural network selective parameter analysis (NN-SPA) as performed by the method according to an embodiment of the invention is engine control, in particular cylinder maximum pressure monitoring. In addition, the NN-SPA may be used in a self-diagnostic apparatus (OBD). The neural network selective parameter analysis (NN-SPA) method can be used to monitor existing physical sensors and check that they work without error. Moreover, NN-SPA can be used for sensor change correction when sensor changes are observed. A further possible use of the NN-SPA method is the fuel quality detection of the fuel used by the combustion engine.

Methods and apparatus for performing selective engine parameter analysis for at least one engine parameter (EP) may be used for any type of combustion engine. In particular, the number and range of phases PH selected as being associated with the engine parameter EP may vary. Depending on the combustion engine, it may for example have only two phases PH of the engine cycle. In a possible embodiment, the engine parameter prediction model can adapt to the observed engine parameter signals. In addition, the engine parameters EP shown in the table of FIG. 5 are also exemplary, and it is also possible to perform selective engine parameter analysis for other engine parameters EP. The method according to an embodiment of the present invention may utilize neural networks for engine control. It is possible to record the cylinder pressure signal CPS and send it to the engine control apparatus according to the embodiment of the present invention. Separation of selected regions or phases PH associated with the target sensors may be performed. The cylinder pressure information selected for each region or phase PH can be processed for the best correlation to the sensor. The method according to an embodiment of the present invention improves the concept of neural network logic by partitioning particular regions of heat dissipation information calculated from pure or filtered cylinder pressure signals (CPS), their differential signals or even cylinder pressure signals and In turn, these signal areas of the phases of the combustion engine are associated with the relevant physical sensor information content having a direct or indirect effect.

While the present invention has been described in connection with what is presently considered to be practical exemplary embodiments, it is to be understood that the invention is not limited to the disclosed embodiments, but, on the contrary, And all changes to the scope that are deemed to be valid.

Claims (15)

A method of performing selective engine parameter analysis for at least one engine parameter of a combustion engine, the method comprising:
(a) detecting the cylinder pressure in the combustion chamber of the combustion engine to produce a cylinder pressure signal;
(b) processing the generated cylinder pressure signal for different phases of the engine cycle of the combustion engine to provide cylinder pressure differential signals and / or cylinder pressure integration signals for each phase of an engine cycle; And
(c) evaluating the generated cylinder pressure signals, processed cylinder pressure differential signals and / or cylinder pressure integration signals of at least one or more selected phases of the engine cycle associated with each engine parameter to evaluate the evaluated signals and engine parameter sensor; Obtaining an optimal correlation between the engine parameter signals outputted by or between the evaluated signals and an engine parameter signal calculated according to an engine parameter prediction model;
Method for performing selective engine parameter analysis comprising a. The method of claim 1,
If the obtained correlation between the evaluated signals and the engine parameter signal output by the engine parameter sensor provided for each engine parameter is high, the engine parameter signal output by the engine parameter sensor is sent to the engine control unit of the combustion engine. A method for performing selective engine parameter analysis, characterized in that it is supplied. 3. The method according to claim 1 or 2,
If the obtained correlation between the evaluated signals and the engine parameter signal output by the engine parameter sensor provided for each engine parameter is low, an error processing procedure including sensor change correction is performed. How to perform parametric analysis. The method of claim 1,
If the obtained correlation between the evaluated signals and an engine parameter signal calculated according to a preset engine parameter prediction model is high, the calculated engine parameter signal is output to an engine control unit of a combustion engine. How to perform an analysis. The method of claim 1,
The cylinder pressure signal is processed for different phases of the engine cycle of the combustion engine and calculated between the evaluated signals and the engine parameter signal output by the engine parameter sensor or according to the evaluated signals and the engine parameter prediction model. Perform an optional engine parameter analysis, characterized in that to provide an estimated heat dissipation information signal for at least one selected phase of an engine cycle associated with each engine parameter to obtain an optimal correlation between the engine parameter signals. How to. The method of claim 5,
Evaluating the generated cylinder pressure signal, the processed cylinder pressure differential signals and / or the cylinder pressure integration signals and / or the processed heat dissipation information signal is performed by neural network software executed by a calculation unit. How to perform an optional engine parameter analysis. The method of claim 1,
Said phase of the engine cycle in which the cylinder pressure signal is processed comprises a compression phase, a combustion phase, an expansion phase and a gas exchange phase. The method of claim 7, wherein
The compression phase is selected to be associated with at least one or more of the engine parameters including air mass, boost pressure, boost temperature, combustion noise, air cleaner service monitor and self diagnostic device (OBD) backup for selected parameters. How to perform an optional engine parameter analysis. The method of claim 7, wherein
The combustion phase is selected to be associated with at least one or more of the engine parameters including combustion delay, exhaust gas recirculation (EGR) ratio, NOx emissions, soot formation, peak combustion pressure, combustion noise and OBD backup for the selected parameter. A method of performing selective engine parameter analysis characterized by the above. The method of claim 7, wherein
The expansion phase is selected to be associated with at least one or more of the engine parameters including exhaust pressure, exhaust temperature, turbocharger speed, soot formation, diesel particulate filter (DPF) status and OBD backup for selected parameters. And performing selective engine parameter analysis. The method of claim 7, wherein
And wherein the gas exchange phase is selected to be associated with at least one or more of the engine parameters including exhaust pressure, turbocharger speed, DPF state, and OBD backup for the selected parameter. An apparatus for performing selective engine parameter analysis for at least one engine parameter of a combustion engine, the apparatus comprising:
(a) a detection unit configured to detect a cylinder pressure in a combustion chamber of the combustion engine to generate a cylinder pressure signal;
(b) a signal processing unit adapted to process the generated cylinder pressure signal for different phases of the engine cycle of the combustion engine to provide cylinder pressure differential signals and / or cylinder pressure integration signals for each phase of the engine cycle; ;
(c) evaluating the generated cylinder pressure signal, the processed cylinder pressure differential signals and / or cylinder pressure integration signals at at least one selected phase of an engine cycle associated with each engine parameter to evaluate the estimated signals and engine A calculation unit configured to obtain an optimal correlation between the engine parameter signals output by the parameter sensor or between the evaluated signals and an engine parameter signal calculated according to an engine parameter prediction model;
Apparatus for performing selective engine parameter analysis comprising a. The method of claim 12,
The calculation unit controls the engine parameter signal output by the engine parameter sensor if the obtained correlation between the evaluated signals and the engine parameter signal output by the engine parameter sensor provided for each engine parameter is high. Apparatus for performing selective engine parameter analysis, characterized in that it is adapted to supply to the unit. The method according to claim 12 or 13,
The calculating unit is adapted to perform an error processing procedure including sensor change correction if the obtained correlation between the evaluated signals and the engine parameter signal output by the engine parameter sensor provided for each engine parameter is low. And an apparatus for performing selective engine parameter analysis. In a vehicle combustion engine,
The combustion engine comprises a device according to claim 12 for performing selective engine parameter analysis for at least one engine parameter.

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