Patent ID: 6792916
Filing Date: 2004-09-21
Classification: F02D,F02M

Abstract:
A control device of common rail fuel injection system of an engine comprising: a high-pressure pump that pressurizes to a high pressure fuel supplied from a feed pump; an electromagnetic valve which is located on a passage between this feed pump and high-pressure pump in order to adjust the quantity of fuel supply to the high-pressure pump; and electromagnetic valve control means for controlling the degree of opening of this electromagnetic valve in accordance with a duty signal, said device further comprising: detection means for detecting an operating condition of the control device such that the degree of opening of said electromagnetic valve is constant; and control frequency alteration means for altering the control frequency of said duty signal to a lower frequency when such an operating condition is detected;wherein said operating condition in which the degree of electromagnetic valve opening is constant in idling condition or non-injection condition of the engine.