Patent ID: 6672279
Filing Date: 2004-01-06
Classification: F01N,F02B,F02D,F02M

Abstract:
An accumulator type fuel injection apparatus comprising:a first accumulator for accumulating high-pressure fuel having high pressure pressurized by a pump; a fuel injection nozzle connected to the first accumulator via a fuel passage, the fuel injection nozzle for injecting fuel into a combustion chamber of an engine; a change-over valve for communicating the high-pressure fuel in the first accumulator with the fuel passage and shutting off communication of the high-pressure fuel between the first accumulator and the fuel passage; a second accumulator connected to the fuel passage downstream of the change-over valve via a branch passage, the second accumulator for accumulating low-pressure fuel having low pressure lower than the high pressure of the high-pressure fuel in the first accumulator; a pressure control valve provided at one of the fuel passage downstream of the change-over valve and the second accumulator, the pressure control valve for adjusting fuel pressure in the fuel passage and the second accumulator; an on-off valve for controlling fuel injection from the fuel injection nozzle; main injection control means for controlling the change-over valve and on-off valve to inject main fuel from the fuel injection nozzle during a predetermined period of time according to an operation condition of the engine; and post injection control means for controlling the on-off valve to inject additional fuel from the fuel injection nozzle, after the injection of the main fuel by the main injection control means, thereby to raise exhaust temperature of the engine, wherein the post injection control means injects the additional fuel so that the injection terminates at one of a first timing and second timing, whichever earlier, at the first timing, the fuel pressure of the one of the fuel passage and second accumulator is lowered at a predetermined pressure lower than the high-pressure in the first accumulator, and at the second timing, an exhaust stroke of the engine is completed.