Patent ID: 7891336
Filing Date: 2011-02-22
Classification: F02B,F02D,F02P,Y02T

Abstract:
1. A method of operating an internal combustion engine having a plurality of cylinders including at least a first cylinder and a second cylinder, the method comprising: firing the first cylinder and the second cylinder in an alternating sequence; during a first mode, adjusting an operating parameter of the engine to produce a first difference between an amount of torque produced by the firing of the first cylinder and an amount of torque produced by the firing of the second cylinder; during a second mode, adjusting the operating parameter of the engine to produce a second difference between an amount of torque produced by the firing of the first cylinder and an amount of torque produced by the firing of the second cylinder; during a third mode, discontinuing firing of the second cylinder for at least one cycle of the engine; and performing the first mode at a higher engine speed than the second mode, and performing the third mode at higher engine speeds than the first mode; the first difference being greater than the second difference.