公开(公告)号：US20210197942A1

公开(公告)日：2021-07-01

申请号：US17038990

申请日：2020-09-30

Applicant: HARBIN ENGINEERING UNIVERSITY

Inventor： JIANHUI ZHAO ,  XIANGDONG LU

IPC: B63H20/10 ,  B63H20/00 ,  F02B61/04 ,  G06N7/00

Abstract: An objective of the disclosure is to provide a simulation method for a two-stage plunger pressurized common rail fuel system of a marine low-speed engine. The method includes: first setting initial status parameters, such as a control step of a system model, a total time of a calculation process, and structure parameters and pressures of components; and then establishing a mathematical model of a fuel booster unit, a mathematical model of a high-pressure fuel pipe and a mathematical model of a fuel injector based on a MATLAB simulation platform, and connecting input and output parameters of the models to realize data transfer between the models. By considering one-dimensional (1D) spatial fluctuations in the high-pressure fuel pipe, the disclosure establishes a high-precision model of the fuel system, which provides an effective method for designing and calculating detailed pressures in the common rail fuel system.

公开(公告)号：US20210199081A1

公开(公告)日：2021-07-01

申请号：US17038914

申请日：2020-09-30

Applicant: HARBIN ENGINEERING UNIVERSITY

Inventor： JIANHUI ZHAO ,  XIANGDONG LU

IPC: F02M55/04 ,  F02M63/02 ,  F02M55/02

Abstract: An objective of the disclosure is to provide a method for calculating a one-dimensional (1D) spatial fluctuation in an unbranched high-pressure fuel pipe of a common rail system. The method includes the following steps: dividing a flow in the unbranched high-pressure fuel pipe according to a spatial length into sections for solving, to obtain forward and reverse pressure fluctuation forms; iteratively calculating forward and reverse pressure fluctuations propagating in a fuel pipe model to obtain fluctuations of various sections of the fuel pipe from an inlet to an outlet within one step, and calculating a flow velocity at a corresponding position in the pipe; and extracting a corresponding flow rate of the system, and substituting into an iterative calculation of the overall system to obtain an output pressure.