High pressure common rail fuel injection control system for low speed marine diesel engine

Abstract

The invention relates to a low-speed marine diesel engine high-pressure common rail fuel oil spraying control system, which comprises a high-pressure valve body and a valve core, wherein parts, positioned at the two ends of a through hole, on the high-pressure valve body are respectively provided with a pilot end cover for installing a valve head and a main valve end cover for installing a piston body, an elastic element for providing the pretightening force for the valve head is arranged in the pilot end cover, a low-pressure servo system for providing the hydraulic driving force for a rodless cavity of the main valve end cover is connected onto the rodless cavity of the main valve end cover, a metering cavity is arranged in a position positioned on a high-pressure oil inlet oil path in the high-pressure valve body, and a high-pressure flow rate meter is arranged in the metering cavity. The low-speed marine diesel engine high-pressure common rail fuel oil spraying control system provided by the invention is used for low-speed marine diesel engine high-pressure common rail fuel oil spraying control, on one hand, the pressure boosting effect of a pressure boosting cylinder is utilized, the valve core is pushed to be fast opened, on the other hand, the electro-hydraulic servo control principle is utilized, and the oil spraying quantity is controlled in real time.

Description

technical field [0001] The invention relates to the technical field of fuel injection control for diesel engines, in particular to a high-pressure common rail fuel injection control system for low-speed marine diesel engines. Background technique [0002] With the development of my country's shipbuilding industry towards ultra-large and high value-added ships, higher requirements are put forward for the independent manufacturing, intelligence and large-scale of its supporting diesel engines. From the perspective of the development of modern marine fuel injection systems, low-speed marine high-pressure common rail fuel injection systems must have the characteristics of fast response, good opening and closing, stable system, and good atomization. like Figure 7 As shown, the current mainstream is the high-pressure common rail fuel injection control system used in the SULZERRT-Flex marine EFI diesel engine series. It mainly includes the main valve body and the spool. The main ...

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Problems solved by technology

[0004] The technical problem to be solved by the present invention is: to overcome the fact that the flow control in the prior art is an open-loop system, it is difficult to realize the real-time control of the fuel injection quantity, and to provide a low-speed marine diesel engine high-pressure common rail fuel injection control system, a high-pressure flow meter and a low-pressure servo The system constitutes a closed-loop feedback control system. The twin-screw rotameter accurately calculates the fuel injection volume required for one injection, and the low-pressure servo system controls the position of the valve stem to control the connection between the high-pressure oil inlet and high-pressure oil outlet. Opening degree, so as to achieve the purpose of real-time control of fuel injection volume, easy to achieve flexible control

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