Method for balancing the torque generated by the cylinders of an internal combustion engine, in particular a direct-injection diesel engine provided with a common rail injection system

A method for balancing torque generated by cylinders of an internal combustion engine, the method comprising:

• determining for each cylinder a quantity indicating the torque generated by the cylinder in a given engine cycle;
• determining, for each cylinder, a nominal fuel amount to be injected in said cylinder in a subsequent engine cycle;
• determining, for each cylinder, a correction coefficient for the nominal fuel amount to be injected in said cylinder in said subsequent engine cycle as a function of the quantity determined for said cylinder;
• correcting said nominal fuel amount to be injected in each cylinder as a function of said correction coefficient determined for said cylinder;
• injecting into each cylinder the corresponding corrected fuel amount;
• and
• correcting said quantities to eliminate systematic errors.

A method for balancing torque generated by cylinders of an internal combustion engine, the method comprising:

• determining for each cylinder a quantity indicating the torque generated by the cylinder in a given engine cycle;
• determining, for each cylinder, a nominal fuel amount to be injected in said cylinder in a subsequent engine cycle;
• determining, for each cylinder, a correction coefficient for the nominal fuel amount to be injected in said cylinder in said subsequent engine cycle as a function of the quantity determined for said cylinder, wherein determining said correction coefficients includes:
• a) determining a mean value of the quantities determined for the different cylinders in a given engine cycle;
• and
• b) determining said correction coefficient for each cylinder as a function of said mean value and said quantity determined for said cylinder, by integrating a difference between said mean value and said quantity determined for said cylinder, so generating a corresponding nominal correction coefficient;
• correcting said nominal fuel amount to be injected in each cylinder as a function of said correction coefficient determined for said cylinder;
• injecting into each cylinder the corresponding corrected fuel amount;
• computing a mean value of said nominal correction coefficient;
• and
• clearing the mean correction coefficient from said nominal correction coefficients.