method and system for controlling the amount of fuel in connection with operating an internal combustion engine

摘要

The present invention relates to a method for controlling the amount of fuel in connection with operating an internal combustion engine based on engine overpressure pressure and engine operating conditions using a map function. Engine operating conditions include engine speed and ambient air pressure. The method comprises the steps of: For low and / or negative engine overpressure pressures using (120) a map function (m), specifying torque values to determine available torque based on an exhaust gas smoke limit taking into account drivability; and determining (170) a maximum allowable amount of fuel based on said determined available torque, considering losses and combustion efficiency.