Abstract: A method is provided for managing the regeneration of a Diesel Particulate Filter (DPF) in a Diesel engine system. The engine having an intake and an exhaust line and being configured to after-inject or post-inject quantities of fuel into a combustion chamber for raising the temperature of the engine exhaust gas. The engine including in the exhaust line, but not limited to, a Diesel Particulate Filter (DPF). The method including, but not limited to identifying a faulty condition of the engine system and, in case that such faulty condition is not critical, measuring the intake air charge and, in case such intake air charge is acceptable, and performing a regeneration process for said Diesel Particulate Filter (DPF).

Abstract: A method is provided for estimating an aging index of the catalytic device. There estimation of the aging index includes, but is not limited to determining the catalytic device operating temperature, determining an aging factor as a function of at least the determined operating temperature, determining the time period spent by the catalytic device at the determined operating temperature, calculating a contributing aging coefficient as a function of the aging factor and the time period, and increasing a cumulative aging parameter by adding the contributing aging coefficient.

Abstract: A method, a computer readable medium embodying a computer program product, and an apparatus are provided determining a pressure in an exhaust line of an internal combustion engine. The internal combustion engine has at least a combustion chamber with an associated exhaust line including, but not limited to a muffler and an after-treatment system. The after-treatment includes, but is not limited to units that are serially connected for at least reducing and preferably substantially eliminating emissions due to combustion products. The method includes, but is not limited to determining the pressure value upstream the muffler, and determining the pressure value upstream each unit of the after-treatment exhaust system by means of the equation Pi=Pi-1+?Pi, where Pi-1 is the value of the pressure downstream the unit i and ?Pi is the drop of the pressure across the unit i.

Abstract: A method and a control system are provided for estimating oxygen concentration downstream a diesel oxidation catalyst within a diesel engine system. The method includes, but is not limited to at least an intake manifold, a combustion chamber, an exhaust manifold, and the diesel oxidation catalyst located in the exhaust line upstream a diesel particulate filter, the method comprising: determining unburned fuel mass flow ejected from the combustion chamber, determining air mass fraction in the exhaust manifold, estimating air mass fraction downstream the diesel oxidation catalyst as a function of said unburned fuel mass flow and said air mass fraction in the exhaust manifold, estimating oxygen concentration downstream the diesel oxidation catalyst as a function of the estimated air mass fraction downstream the diesel oxidation catalyst.