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1 The introduction of OBDII and EOBD involves misfiring detection, a critical issue for engine management systems. The paper reviews the multiple sources of misfiring, and presents an overview of the different detection methods. Moreover, misfiring detection experiments, based on instantaneous engine torque measurement, were performed at the Brussels University, in collaboration with Mannesmann VDO, highlighting the difficulty to develop a reliable detection method.

Motor vehicles emissions regulations become more and more stringent, concerning the air quality improvement. In that way, EGR technology ( like Exhaust Gas Recirculation ), with increasing recirculation flowrates, is more and more frequently applied [3]. If the manifold is made in polymer composites, problems appear at the EGR interface, because of material T° limits ( between 150° and 180 °C stabilized ). The study presents different goals: 1. To identify the major parameters leading to high manifold heat constraints; 2. To model the phenomena, to be able to extrapolate experimental results; 3. To get a practical tool, under abacus and model, helping designers to know the limits of the design, for one application, and so that, to be sure that the manifolds will not be overstressed in service. To get this, both experimental and numerical ways are taking into account. Let us remind that EGR is applied to limit NOx levels, and also fuel consumption by pumping losses limitation [3].

Several idle control actuators are based on a solenoϊd technology but a more efficient solution is to use stepper motors. Ehanced knowledge of the idle air flow parameters allows optimization of the stepper motor design. The objective of this paper is to describe this optimization process, with the help of experimental data and numerical simulation.