Method for detection of abnormal combustion for internal combustion engines

A method for controlling combustion of a supercharged internal combustion engine with controlled ignition, in which abnormal combustion is detected in a combustion chamber of at least one cylinder of the engine by a continuous measurement of pressure inside the at least one cylinder, comprising:

• a) using a computer to estimate cylinder pressure with a physical model describing, as a function of an angle of rotation of a crankshaft of the engine, development of pressure in the at least one cylinder during one combustion without any pre-ignition;
• b) estimating a cylinder pressure, starting from the model and the measurement of intake pressure to the at least one cylinder;
• c) detecting a start of the abnormal combustion by comparing at least one first value of a variable calculated using measurement of the pressure in the at least one cylinder and at least one second value of the variable calculated using an estimation of the pressure in the at least one cylinder;
• d) determining an amplitude of pre-ignition by repeating steps b) and c) for a number of crankshaft angles;
• and
• e) controlling progress of the abnormal combustion detected in the combustion chamber according to the amplitude of the pre-ignition.