Patent ID: 7673503

Claim:
A method for estimating exhaust temperature at an outlet of a cylinder of an internal combustion engine, the outlet being closed by an exhaust valve that can open to let out gases present inside the cylinder, and the cylinder including a crankshaft converting to rotation a translational movement of a piston mounted such that the piston can slide in the cylinder, the piston closing a combustion chamber of the cylinder, the method comprising: measuring, at a time preceding a time of opening of the exhaust valve, an angle of rotation of the crankshaft and a cylinder pressure inside the combustion chamber, and determining a volume of the combustion chamber according to the angle of rotation; determining a mass of air and a proportion of recycled gases in the combustion chamber at the time of opening, and deducing from the determining a related total mass of gas; determining a cylinder temperature inside the cylinder according to the cylinder pressure, the volume of the combustion chamber, and the total mass of gas at the time of the opening of the exhaust valve; and determining the exhaust temperature according to the cylinder temperature.