Abstract
Being able to monitor the state of health for a system like the combustion engine is an essential aspect to reduce warranty costs and to increase the availability of the vehicle. As the combustion engine is a highly complex system, advanced model based methods need to be established to avoid false alarms and wrong repairs in the workshop. In the presented study, a method is introduced to meet these requirements. To demonstrate the application, faults with a similar effect on the vehicle, causing engine roughness, are investigated. Through a process model of the combustion and its transmission path, the engine speed can be calculated with its corresponding cylinder pressure. By evaluating the process parameters which define the simulated pressure in the combustion chamber, a conclusion regarding the faulty input can be drawn.
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Notes
- 1.
This process behaves in a binary way, which means that either there is enough energy to combust the air-fuel mixture and the pressure progression behaves normal. Or, in the other case, no work at all is produced. Hence to be able to monitor trends in the ignition system, a detailed process analysis of the electric circuit has to be conducted. This was also figured out in [3].
- 2.
The single cycles can be averaged to get a higher accuracy. However, the model can then no longer consider stochastic errors.
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Hartl, F., Ament, C. (2022). Fault Diagnosis by Estimating the In-Cylinder Pressure Progression of a Gasoline Engine. In: Zattoni, E., Simani, S., Conte, G. (eds) 15th European Workshop on Advanced Control and Diagnosis (ACD 2019). ACD 2019 2018. Lecture Notes in Control and Information Sciences - Proceedings. Springer, Cham. https://doi.org/10.1007/978-3-030-85318-1_6
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