Highly Dynamic Intake and Exhaust Back Pressure Control 2019-26-0147
In the last years, engine emissions have become a prime issue in internal combustion engine development. As the legal limits of air pollutants get more demanding, accurate emission measurement is crucial. An important prerequisite for high quality measurement in terms of accuracy and repeatability is the proper control of intake and exhaust back pressure. However, pressure control gets more and more challenging with increasing dynamics of the emission test cycles. This contribution introduces a novel highly dynamic pressure control system. Its key features are:
- Isolation: two strictly separated paths for intake and exhaust side; hence, intake air and exhaust gas cannot interfere with each other.
- Flexibility: the system is capable of handling a diverse range of engine sizes and types (e.g. Diesel and SI engines).
- Accuracy: highly accurate pressure control due to physically motivated mathematical modelling and advanced control systems design.
- Easy commissioning: robust controller design ensures that the same setup is capable of dealing with different engines.
The challenges of highly dynamic pressure control are discussed and the key ideas of the controller are presented. Measurement data is shown to confirm the performance of the proposed system.
Stefan L. Hölzl, Richard Seeber, Klemens Kranawetter, Robert Bauer, Wolfram Rossegger
Graz University of Technology, KS Engineers
Symposium on International Automotive Technology 2019