Cylinder Pressure Based Closed-Loop Control

  RWTH Aachen | VKA

In addition to powertrain hybridization and electrification, further optimization of the engine combustion process is required. Particularly promising is the cylinder pressure based closed loop control. This requires a very fast response to the combustion processes. For this purpose, measurement of the cylinder pressure and calculation of parameters in real time are essential. Important parameters are the indicated mean effective pressure and the combustion phasing α50. A promising approach is to perform input signal preprocessing and filtering by using field-programmable gate array (FPGA).

Due to the high performance of FPGAs it is possible to achieve significant acceleration of the control functions with minimal system latency. Future combustion processes require increasing calculation complexity. The expandability of FPGAs offers the new degrees of freedom to meet future demands.

In-Cycle combustion control is of particular interest for auto ignition of gasoline fuels GCAI (Gasoline Controlled-Auto-Ignition). GCAI allows high efficiency and very low NOx-emissions by using high conversion rates. Challenging are high fluctuations of the indicated mean effective pressure and combustion phasing. These lead to unsteady engine operation and low efficiencies. In-cycle control compensates the fluctuations, increases the efficiencies and expands the GCAI operation range.

Current research activities evaluate different in-cycle control concepts on the engine test bench. A one-cylinder research engine is equipped with MicroAutobox from dSPACE and an FPGA expansion module for engine investigations. The use of an electromagnetic valvetrain (EMVT) allows ultra-fast interventions in gas exchange of the current cycle. Fundamental engine process effects can be investigated and transferred to mass-production engines in a next step.

 

Projects

FOR 2401

A state-of-the-art approach for closed-loop control of low temperature combustion processes are cycle-based control algorithms. However, these approaches allow only a stable operation in a very limited engine-map. Cycle-based controllers act such that only the system dynamics and disturbances which occur at a cycle-averaged time scale can be controlled.
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Publications

Rapid Control Prototyping für Zylinderdruckindizierung

Verfahren und Vorrichtung zum Betrieb eines Verbrennungsmotors bei kontrollierter Selbstzündung

Potential of In-Cycle Combustion Control for the Autoignition Process of Gasoline Engines

Potenziale für neue Brennverfahrenskonzepte durch In-Zyklus-Regelung

Decoupling of Consecutive GCAI Combustion Cycles by FPGA Based Realtime Cylinder Pressure Analysis

Model Based Control of Gasoline Controlled Auto Ignition

Entwicklung eines FPGA-basierten Indiziermoduls für ein Rapid Control Prototyping System zur zylinderdruckgeführten Regelung von Verbrennungsmotoren

Modellbasierte Echtzeitoptimierung der ottomotorischen Selbstzündung

NVH Optimization of Range Extender Engines by Electric Torque Profile Shaping

A Study on In-Cycle Combustion Control for Gasoline Controlled Autoignition

Contact

Name

Maximilian Wick

Research Associate

Phone

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+49 241 80 48230

Email

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