Method for estimating the atmospheric pressure of an internal combustion engine

A method for determining an atmospheric pressure for a combustion engine comprising at least one cylinder supplied with air by an intake device comprising a throttle valve, at least one air intake valve admitting air into said cylinder, and a pressure sensor measuring a pressure prevailing between said throttle valve and said at least one intake valve, said method:

• measuring a first pressure supplied by said pressure sensor at a given angular position of the engine,
• from the measured pressure and other parameters including an engine speed and/or a position of said throttle valve, determining an estimated value for the atmospheric pressure,
• measuring a second pressure supplied by the pressure sensor at a predetermined time interval after the measuring of the first pressure, wherein said time interval corresponds to an odd-numbered multiple of a half-period of a pressure pulsation that said pressure sensor may experience as air is admitted into the engine, and
• wherein an average pressure corresponding to a mean of the first pressure and of the second pressure is used, with the other parameters, to determine the atmospheric pressure.