Patent ID: 6990958
Filing Date: 2006-01-31
Classification: F02D,F02M

Abstract:
1. An injection control system of a diesel engine having a common rail for accumulating fuel, which is pressure-fed by a fuel pump, and injectors for injecting the high-pressure fuel, which is supplied from the common rail, into combustion chambers of cylinders of the engine, the injection control system comprising: condition determining means for determining whether a learning condition for performing an injection quantity learning operation is established; pump commanding means for commanding the fuel pump to discharge a command pressure-feeding quantity of the fuel to control a pressure of the fuel accumulated in the common rail to a target injection pressure after the learning condition is established; load determining means for determining whether a load of the fuel pump is stabilized after the pressure of the fuel is controlled to the target injection pressure; permission determining means for determining whether a single injection in a specific cylinder of the engine for performing the injection quantity learning operation is permitted after it is determined that the load of the fuel pump is stabilized; injector commanding means for commanding the injector to perform the single injection if the single injection is permitted; measuring means for measuring a fluctuation of a rotation speed of the engine caused by performing the single injection; calculating means for calculating a correction value based on the fluctuation of the rotation speed; and correcting means for correcting a command injection quantity, which is outputted to the injector, in accordance with the correction value.