Patent ID: 7971573
Filing Date: 2011-07-05
Classification: F02D,Y02T

Abstract:
1. A system for regulating pilot fuel supply in a combustion engine, which system comprises cylinder-specific pressure sensors for installation in the cylinders of a combustion engine for measuring cylinder pressures, the system comprising a control unit arranged to determine the crankshaft angle at maximum pressure of each cylinder and the cylinders' average crankshaft angle at maximum pressure in response to cylinder pressure measurements, to verify whether the average crankshaft angle at maximum pressure is within a certain range of crankshaft angle variation, to control the duration of total pilot fuel injection into the engine if the average crankshaft angle at maximum pressure is outside the range of crankshaft angle variation, to determine the differences between each cylinder's crankshaft angle at maximum pressure and the average crankshaft angle at maximum pressure if the average crankshaft angle at maximum pressure is within the range of crankshaft angle variation, to compare the differences with a certain range of difference variation, to control the duration of pilot fuel injection into a cylinder if the difference in an individual cylinder traverses the minimum or maximum limit of the range of difference variation.