公开(公告)号：US20040055577A1

公开(公告)日：2004-03-25

申请号：US10619752

申请日：2003-07-14

Applicant: C.R.F. Societa' Consortile Per Azioni

Inventor： Alessandro Carlo

IPC: F02D041/30

CPC classification number: F02D41/3863 ,  F02D41/1402 ,  F02D41/2451 ,  F02D41/248 ,  F02D41/402 ,  F02D41/406 ,  F02D2041/2027 ,  F02D2250/31 ,  Y02T10/44

Abstract: There is described a control method for controlling the fuel injection pressure of a common rail injection system of an internal combustion engine, the injection system having a high-pressure pump for supplying high-pressure fuel to the common rail, and for performing, at each engine cycle, a first and at least a second fuel delivery synchronously with respective fuel injections to the engine; a regulating device for regulating the fuel pressure in the common rail; and an electronic control unit supplying the regulating device with a control signal to regulate the fuel pressure in the common rail. The control method provides for determining a first value of the duty cycle of the control signal as a function of a required pressure value in the common rail, in turn a function of the power required of the engine, and as a function of an actual pressure value in the common rail; determining a second value of the duty cycle of the control signal as a function of the first value of the duty cycle, and as a function of a total correction coefficient; causing the duty cycle of the control signal to assume the first value during the first fuel delivery; and causing the duty cycle of the control signal to assume the second value during the second fuel delivery.

Abstract translation: 描述了一种用于控制内燃机的共轨喷射系统的燃料喷射压力的控制方法，该喷射系统具有用于向共轨供应高压燃料的高压泵，并且用于在每个 发动机循环，与向发动机的各个燃料喷射同步的第一和至少第二燃料输送; 用于调节共轨中的燃料压力的调节装置; 以及电子控制单元，其向调节装置提供控制信号以调节共轨中的燃料压力。 该控制方法提供了根据共轨中所需的压力值的函数确定控制信号的占空比的第一值，进而确定发动机所需功率的函数，并且作为实际压力的函数 共轨价值; 根据所述占空比的第一值确定所述控制信号的占空比的第二值，并且作为总校正系数的函数; 使得控制信号的占空比在第一燃料输送期间呈现第一值; 并且在第二燃料输送期间使控制信号的占空比采取第二值。