Patent ID: 7677092
Filing Date: 2010-03-16
Classification: F02D,Y02T

Abstract:
1. A cylinder characteristic variation sensing device applied to a multi-cylinder internal combustion engine having a plurality of cylinders and a plurality of injectors respectively provided to the cylinders, the cylinder characteristic variation sensing device comprising: a small injection controlling means for performing small injections sequentially in the respective cylinders, thereby injecting a small quantity of fuel from each injector regardless of manipulation performed by a driver to operate the internal combustion engine; a torque increase amount sensing means for sensing an increase amount of output torque caused in connection with the small injection or a physical quantity relevant to the increase amount for each cylinder; an injection quantity sensing means for sensing an actual injection quantity of the small injection or a physical quantity relevant to the injection quantity for each cylinder; and a cylinder characteristic variation calculating means for calculating a variation in a cylinder characteristic among the cylinders based on a variation in the sensing value of the injection quantity sensing means among the cylinders and a variation in the sensing value of the torque increase amount sensing means among the cylinders.