Combustion closed-loop control method based on fuel injection characteristic parameters of engine fuel injector
A technology of fuel injection characteristics and closed-loop control, which is applied in engine control, engine testing, engine components, etc. It can solve the problem that the sampling frequency of rail pressure sensors and the extraction accuracy of feature quantities are not enough to achieve closed-loop control of combustion and cannot realize real-time correction of fuel injection Issues such as timing and power-on pulse width
Pending Publication Date: 2021-05-25
中国船舶集团有限公司第七一一研究所
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[0004]
The fuel injection strategy correction coefficients such as fuel injection timing and power-on pulse width are stored in the ECU in the form of a MAP map after the calibration test is cured, and the table is checked according to the engine operating conditions. Real-time correction of fuel injection timing and power-on pulse width for environmental changes
However, the sampling frequency and feature extraction accuracy of the rail pressure sensor are not enough to meet the requirements of combustion closed-loop control
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[0040] In the following description, numerous specific details are given in order to provide a more thorough understanding of the present invention. It will be apparent, however, to one skilled in the art that embodiments of the invention may be practiced without one or more of these details. In other examples, some technical features known in the art are not described in order to avoid confusion with the embodiments of the present invention.
[0041] It should be noted that the terms used herein are for the purpose of describing specific embodiments only, and are not intended to limit exemplary embodiments according to the present invention. As used herein, singular forms are intended to include plural forms unless the context clearly dictates otherwise. In addition, it should also be understood that when the terms "comprising" and / or "comprising" are used in this specification, it indicates the presence of the features, integers, steps, operations, elements and / or component...
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The invention discloses a combustion closed-loop control method based on fuel injection characteristic parameters of an engine fuel injector. The combustion closed-loop control method comprises the following steps that 1, off-line injection characteristic parameter information of the fuel injector corresponding to different engine working conditions is acquired, and reference parameter characteristic points of needle valve action of the corresponding fuel injector are extracted according to each group of off-line injection characteristic parameter information; 2, in the actual operation process of the engine, real-time injection characteristic parameter information of the oil injector is obtained, and real-time parameter characteristic points corresponding to the action of the needle valve are extracted according to the real-time injection characteristic parameter information; and 3, closed-loop optimization control is performed on the real-time injection characteristic parameters according to a comparison result of the real-time parameter characteristic points and the reference parameter characteristic points. According to the control method, high-precision testing and prediction calculation of online fuel injection characteristic parameters of the fuel injector can be achieved, and real-time correction of fuel injection timing and control pulse width is achieved through an ECU and a signal post-processing module.
Description
technical field [0001] The invention relates to the technical field of marine engine equipment, in particular to a combustion closed-loop control method based on fuel injection characteristic parameters of an engine fuel injector. Background technique [0002] Through the feedback of the combustion state in the cylinder, the combustion closed-loop control technology that adjusts the performance control parameters such as engine fuel injection and gas distribution, and realizes the precise control of the combustion process is the development trend of intelligent marine diesel engines in the future. [0003] The fuel injection parameters that can be tested online for existing high-pressure common rail diesel engines include common rail pressure, fuel injection timing and injection pulse width output by ECU (engine control unit) control parameters; closed-loop control of fuel injection parameters is realized through engine speed and torque signal feedback . [0004] The fuel i...
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Login to View More IPC IPC(8): F02D41/38F02D41/40F02D41/14F02M65/00
CPCF02D41/3827F02D41/401F02D41/40F02D41/1401F02M65/00F02M65/001F02M65/005Y02T10/40
Inventor 郭立君平涛李晓声汤弘扬张通常伟杰
Owner 中国船舶集团有限公司第七一一研究所