IMEP-Estimation and In-Cylinder Pressure Reconstruction for Multicylinder SI-Engine by Combined Processing of Engine Speed and One Cylinder Pressure

Hamedovic, Haris; Raichle, Franz; Breuninger, Jörg; Fischer, Wolfgang; Dieterle, W.; Klenk, Martin; Böhme, J.F.

doi:10.4271/2005-01-0053

Cited by 38 publications

(22 citation statements)

References 7 publications

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“…Hamedović proposes the combined processing of one cylinder pressure signal together with the engine speed [1,33]. This approach focuses on the cylinder-individual estimation of torque and combustion phasing especially with respect to the stabilization of partly homogeneous combustion processes.…”

Section: State Of the Artmentioning

confidence: 99%

“…Within the present study, a simplified engine model is utilized at which a stiff behaviour of the crankshaft and the connection rods is assumed [1]. Since the potential energy can be neglected for passenger car engines, the energy of the rotating crankshaft equals approximately the kinetic energy E kin ðjÞ:…”

Section: Drive Train Modelmentioning

confidence: 99%

“…The detection of misfire and electronic functions for torque balancing for example, is standard in today's engine control systems. Consequently, the more complex task of an accurate estimation of combustion features becomes the focal point of interest [1][2][3]. This represents the basis for the development of optimized engine control strategies required by modern combustion processes with high exhaust gas recirculation (EGR) rates.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Adaptation of a zero-dimensional cylinder pressure model for diesel engines using the crankshaft rotational speed

Weißenborn

Bossmeyer

Bertram

2011

Mechanical Systems and Signal Processing

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Section: State Of the Artmentioning

confidence: 99%

Section: Drive Train Modelmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Adaptation of a zero-dimensional cylinder pressure model for diesel engines using the crankshaft rotational speed

Weißenborn

Bossmeyer

Bertram

2011

Mechanical Systems and Signal Processing

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“…Combustion parameters could be estimated based on the analysis of other signals [2][3][4][5][6][7][8][9], but usually for calibration purposes cylinder pressure is favored, due to better performance. The use of other signals could be of interest for onboard applications of the proposed calibration methodology: the Engine Control Unit could perform a continuous combustion calibration.…”

Section: Introductionmentioning

confidence: 99%

Automatic Calibration of Control Parameters based on Merit Function Spectral Analysis

et al. 2014

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The number of actuations influencing the combustion is increasing, and, as a consequence, the calibration of control parameters is becoming challenging. One of the most effective factors influencing performance and efficiency is the combustion phasing: for gasoline engines control variables such as Spark Advance (SA), Air-to-Fuel Ratio (AFR), Variable Valve Timing (VVT), Exhaust Gas Recirculation (EGR) are mostly used to set the combustion phasing. The optimal control setting can be chosen according to a cost function, taking into account performance indicators, such as Indicated Mean Effective Pressure (IMEP), Brake Specific Fuel Consumption (BSFC), pollutant emissions, or other indexes inherent to reliability issues, such as exhaust gas temperature, or knock intensity. The paper proposes the use of the extremum seeking approach during the calibration process. The main idea consists in changing the values of each control parameter at the same time, identifying its effect on the monitored cost function, allowing to shift automatically the control setting towards the optimum solution throughout the calibration procedure. Obviously, the nodal point is to establish how the various control parameters affect the monitored cost function and to determine the direction of the required variation, in order to approach the optimum. This task is carried out by means of a spectral analysis of the cost function: each control variable is varied according to a sine wave, thus its effect on the cost function can be determined by evaluating the amplitude of the Fast Fourier Transform (FFT) of the cost function, for the given excitation frequency. The FFT amplitude is representative of the cost function sensitivity to the control variable variations, while the phase can be used to assess the direction of the variation that must be applied to the control settings in order to approach the optimum configuration. Each control parameter is excited with a different frequency, thus it is possible to recognize the effect of a single parameter by analyzing the spectrum of the cost function for the given excitation frequency. The methodology has been applied to data referring to a PFI engine, trying to maximize IMEP, while limiting the knock intensity and exhaust gas temperature, using SA and AFR as control variables. The approach proved to be efficient in reaching the optimum control setting, showing that the optimal setting can be achieved rapidly and consistently.

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“…This approach however has some limitations that could be overcome only by an accurate modeling of the vehicle and the engine mechanism [24]. Between these limitations is worth briefly mentioning: (a) the incremental errors due to the construction tolerance and the inaccurate mounting of the cogs [19]; (b) the higher the number of cylinders, the lower the speed variations of the crankshaft and then, the lower the applicability of this method; moreover, the higher the engine speed, the lower are the speed variations of the crankshaft because of the engine inertia; (c) the inertia on the entire vehicle and its operating conditions; (d) the torsional deflections, especially at high engine speeds [25,26]; • Force on spark plug: The in-cylinder pressure curve can be obtained also by the measurement of the compression forces acting on the cylinder head structure. The measurement devices can be mounted in various ways [27][28][29][30], but the most common location is beneath the spark-plug [31].…”

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confidence: 99%

Experimental Assessment of a Methodology for the Indirect in-Cylinder Pressure Evaluation in Four-Stroke Internal Combustion Engines

Romani

Bianchini

Vichi³

et al. 2018

Energies

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Recent innovations in engine control and diagnostics are providing room for development of innovative combustion approaches (e.g., low-temperature combustion) able to minimize the creation of pollutants. To ensure the constant fulfillment of the prescribed thermodynamic conditions, however, a fast real-time monitoring of the in-cylinder pressure is needed. To this end, dynamic pressure sensors, flush-mounted on the cylinder head, are commonly used. With this approach, the measurement accuracy is high, but the durability is limited by the harsh working conditions. The installation on the cylinder head is also complex. The development of robust and effective indirect measurement systems could then represent the enabler of a further development of this technology. In the present study, an innovative methodology to measure the in-cylinder pressure has been conceived and extensively tested on a four-stroke single-cylinder engine. The proposed approach is based on the analysis of the mechanical stress on the engine studs by means of a piezoelectric strain washer. This solution allows the user for a rapid and cost-effective sensor installation, described in the paper along with the signal post-processing techniques. Results showed good accuracy and robustness of the methodology, making the results of practical use for engine control.

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IMEP-Estimation and In-Cylinder Pressure Reconstruction for Multicylinder SI-Engine by Combined Processing of Engine Speed and One Cylinder Pressure

Cited by 38 publications

References 7 publications

Adaptation of a zero-dimensional cylinder pressure model for diesel engines using the crankshaft rotational speed

Adaptation of a zero-dimensional cylinder pressure model for diesel engines using the crankshaft rotational speed

Automatic Calibration of Control Parameters based on Merit Function Spectral Analysis

Experimental Assessment of a Methodology for the Indirect in-Cylinder Pressure Evaluation in Four-Stroke Internal Combustion Engines

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