Paul Anthony Battiston

Cylinder-pressure-based engine control using pressure-ratio-management and low-cost non-intrusive cylinder pressure sensors

Over the last two decades, advanced engine control systems have been developed that use cylinder pressure as the primary feedback variable. Production application has been limited by cost, reliability, and packaging difficulties associated with intrusive cylinder pressure sensors. Now, a low-cost cylinder-pressure-based engine control system has been developed that utilizes Pressure-Ratio Management (PRM) and non-intrusive cylinder pressure sensors mounted in the spark plug boss of four-valve-per-cylinder engines. The system adaptively optimizes individual-cylinder spark timing and air-fuel ratio, and overall exhaust gas recirculation (EGR) for best fuel economy and lowest emissions over the life of each vehicle. This paper presents the engine control and cylinder pressure sensor systems. Results are presented showing spark timing and EGR control, knock and misfire detection, cylinder-to-cylinder air/fuel balancing, and cold start control.

SCR calibration using design of experiments

NOx catalysts play a key role in reducing oxides of nitrogen. Further degrees of freedom are introduced into the calibration process when a selective catalytic reduction (SCR) system is incorporated. Ricardo and General Motors have developed an advanced calibration process which counters the increasing complexity of powertrain calibration by using Design of Experiments (DoE). A reduction in development outlay can be achieved despite increased system complexity.

SCR-Applikation Mittels Statistischer Versuchsplanung

NOx-Katalysatoren stellen bei der Beseitigung von Stickoxiden eine Schlusseltechnik dar. Unabhangig von der Ausfuhrung der SCR-Katalysatoren ergeben sich aus der Integration des Katalysators in den Abgasstrang zusatzliche freiheitsgrade, die bei einer Motorenapplikation zu berucksichtigen sind. Ricardo hat in Kooperation mit General Motors einen fortschrittlichen Ansatz entwickelt, mit dem der zunehmenden Komplexitat solcher Antriebsstrange begegnet werden kann. Durch den breiten Einsatz von Design of Experiments (DoE) kann der Entwicklungsaufwand trotz steigender Systemkomplexitat reduziert werden.