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Automotive applications equipped with Diesel engines are subject to stringent legislative requirements in terms of particulate matter (PM) emissions. A Diesel particulate filter (DPF) reduces the tailpipe PM content in the exhaust gas to fulfill the emission thresholds of law's authority. As an emission relevant component, the DPF efficiency must be monitored according to the on-board diagnostic (OBD) regulation. In the US and European market, these OBD regulation limits are becoming more tightened. Currently established methods rely on the analysis of the differential pressure sensor signal across DPF. The measured pressure loss depends on a lot of disturbance variables. Thus, monitoring concepts based on differential pressure become increasingly difficult to comply with future OBD legislation. New developed PM sensors offer the possibility to detect and quantify the particulate emissions in DPF downstream position. This information can be processed in a DPF efficiency OBD monitor.

Future regulations require intelligent solutions for Diesel engine emission reduction. Lowest engine out emissions are necessary to reduce the requirements of exhaust aftertreatment systems. Alternative Diesel combustion processes offer the potential of significant NOx reduction while keeping particulates low, but they are in some load areas highly sensitive to the cylinder charge conditions. Whereas mixture preparation and combustion are already well developed in the stationary mode, in-vehicle operation has not been mastered previously. This paper describes the author's approach towards Intelligent (IQ) Emission (Em) Reduction with modular and tailored solutions for both combustion system and electronic control. The enabler for the vehicle application of such combustion systems is an intelligent closed-loop combustion control based on a cylinder pressure sensor, that is presented in this paper.