Model For Inferring Temperature Of Exhaust Gas At An Exhaust Manifold Using Temperature Measured At Entrance Of A Diesel Oxidation Catalyst

An internal combustion engine comprising:

• an exhaust system which conveys exhaust gas created in engine combustion chambers to atmosphere and which comprises an exhaust manifold through which exhaust gas from the combustion chambers enters the exhaust system, an after-treatment device for treating exhaust gas before passing into the atmosphere, and a sensor providing data for temperature of exhaust gas entering the after-treatment device;
• and
• a processor comprising an algorithm that models temperature of exhaust gas at the exhaust manifold as a function of the data from the sensor and other data, including certain thermodynamic constants, certain geometry of the exhaust system, and certain variables related to operation of the engine, and that when executed, processes the data from the sensor and the other data to calculate temperature of exhaust gas at the exhaust manifold.