Development of a Virtual Sensor to Predict Cylinder Pressure Signal Based on a Knock Sensor Signal 2022-01-0627
Virtual sensing refers to the processing of desired physical data based on measured values. Virtual sensors can be applied not only to obtain physical quantities which cannot be measured or can only be measured at an unreasonable expense but also to reduce the number of physical sensors and thus lower costs. In the field of spark ignited internal combustion engines, the virtual sensing approach may be used to predict the cylinder pressure signal (or characteristic pressure values) based on the acceleration signal of a knock sensor.
This paper presents a method for obtaining the cylinder pressure signal in the high-pressure phase of an internal combustion engine based on the measured acceleration signal of a knock sensor. The approach employs a partial differential equation to represent the physical transfer function between the measured signal and the desired pressure. A procedure to fit the modeling constants is described using the example of a large gas engine. The results indicate the great potential of this approach to be applied to cylinder balancing or further engine control tasks.
Citation: Posch, S., Pirker, G., Kefalas, A., and Wimmer, A., "Development of a Virtual Sensor to Predict Cylinder Pressure Signal Based on a Knock Sensor Signal," SAE Technical Paper 2022-01-0627, 2022, https://doi.org/10.4271/2022-01-0627. Download Citation
Author(s):
Stefan Posch, Gerhard Pirker, Achilles Kefalas, Andreas Wimmer
Affiliated:
LEC Gmbh, Graz University of Technology
Pages: 11
Event:
WCX SAE World Congress Experience
ISSN:
0148-7191
e-ISSN:
2688-3627
Related Topics:
Spark ignition engines
Gas engines
Engine cylinders
Differential gears
Engines
Knock
Pressure
Sensors and actuators
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