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Ship dual-fuel-engine speed control system and method

A dual-fuel engine and speed regulation technology, which is applied to combustion engines, internal combustion piston engines, charging systems, etc., can solve the problems of low-load switching process operation, engine load and flameout, and slow dynamic response, etc., to achieve fast dynamic response, The effect of high fuel substitution rate and stable speed

Inactive Publication Date: 2014-07-02
HARBIN ENG UNIV
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  • Application Information

AI Technical Summary

Problems solved by technology

When running in dual-fuel mode, diesel is mainly used as a pilot gas, and the engine is prone to problems such as load stalling, unloading overspeed, slow dynamic response, low load and unstable operation during switching

Method used

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  • Ship dual-fuel-engine speed control system and method
  • Ship dual-fuel-engine speed control system and method
  • Ship dual-fuel-engine speed control system and method

Examples

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Embodiment Construction

[0023] The present invention is described in more detail below in conjunction with accompanying drawing example:

[0024] to combine Figure 1~3 , the present invention is formed by refitting the original marine diesel engine. If the original marine diesel engine uses a fuel injection pump with a mechanical governor, the fuel injection pump and the mechanical governor need to be replaced with a fuel injection pump with a fuel supply adjustment actuator. , and a rack position sensor is integrated on the oil supply adjustment actuator. If the fuel system of the original marine diesel engine is a position-type electronically controlled fuel injection system, no mechanical modification to the fuel system is required. In addition, a gas injection device needs to be installed on the original marine diesel engine, including a gas rail, a gas injection actuator and a gas nozzle, and the gas supply equipment supplies natural gas at a specific pressure required by the engine to the gas...

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Abstract

The invention provides a ship dual-fuel-engine speed control system and method. The speed control adopts the method to implement speed control of a ship diesel engine. The method includes in the dual fuel mode, adopting a speed loop to calculate the equivalent fuel injection quantity for each cycle of the engine, querying a fuel oil and fuel gas distribution ratio MAP graph to distribute the fuel oil and fuel gas, allowing the controller to control a fuel oil supply quantity adjusting executer and a fuel gas injection executer to perform quantitive fuel oil and fuel oil injection. The fuel oil and fuel gas distribution ratio MAP graph are different under steady condition and transient condition. The system is formed by optimizing an existing ship diesel engine, mechanical changes of a fuel oil system are omitted, and engine speed deviation can be eliminated rapidly; in the dual fuel mode, the engine is prevented from flameout during loading and overspeed during unloading, dynamic response is fast, and the engine operates stably in low load; energy-saving emission reduction effect is obvious as compared with an original diesel engine.

Description

technical field [0001] The invention relates to a marine diesel engine, in particular to a speed regulating device and a speed regulating method of the marine diesel engine. Background technique [0002] The increasing depletion of petroleum resources leads to the continuous rise of diesel prices and the increasingly serious environmental pollution caused by the emission of diesel engines, which have become two technical problems restricting the development and application of diesel engines. Among all petroleum alternative fuels, natural gas is considered by the world today to be the most ideal petroleum alternative fuel because of its abundant reserves, low price, and clean combustion. The use of diesel / liquefied natural gas (LNG) dual fuel for marine engines can not only save diesel consumption and reduce ship operating costs, but also greatly reduce harmful emissions. ideal alternative fuel. Dual-fuel engine has become a research hotspot and an important topic in the fi...

Claims

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Application Information

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IPC IPC(8): F02D19/06F02D1/08F02M21/02
CPCY02T10/36Y02T10/32Y02T10/30
Inventor 宋恩哲刘庆伟丁顺良姚崇孙军
Owner HARBIN ENG UNIV
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