Control method for composite fuel injection system
A fuel injection system and fuel injection technology, applied in the direction of fuel injection control, fuel injection pump, electrical control, etc., can solve the problem of large volume of high-pressure rail pipe or oil accumulator, difficult system layout and oil pressure control, and unreliable reliability Solve and other problems to achieve the effect of improving atomization characteristics, improving economy and emission, and ensuring reliability
Inactive Publication Date: 2014-06-04
DALIAN UNIV OF TECH
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Problems solved by technology
Such a large circulating oil supply has high requirements on the high-pressure oil pump of the fuel injection system. The volume of the high-pressure rail pipe or oil accumulator used in the system is relatively large, and the system layout and oil pressure control are difficult, which makes the entire fuel injection system expensive.
In addition, when the high-pressure common rail electronically controlled fuel injection system injects heavy oil, the reliability has not yet been resolved
Method used
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Embodiment Construction
[0016] figure 1 A diagram of a compound fuel injection system is shown. In the figure, the mechanical fuel injection pump 6a supplies most of the required oil quantity to the mechanical fuel injector 7a according to the engine load demand to realize the main injection. Under the control of the ECU electronic control unit 4a, the electronically controlled high-pressure oil pump 1a is driven by the cam driven by the crankshaft, pumps fuel into the high-pressure rail pipe 2a, and maintains the set pressure; the ECU electronic control unit 4a according to the built-in fuel injection strategy, Control the electronically controlled fuel injector 3a to realize flexible auxiliary injection.
[0017] figure 2 An alternative compound fuel injection system diagram is shown. In the figure, the electronically controlled unit pump 6b, under the control of the ECU electronic control unit 4a, supplies most of the required oil quantity to the mechanical fuel injector 7a to realize the main...
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The invention relates to a control method for a composite fuel injection system, in particular to a control method for a fuel injection system of a marine medium-speed or low-speed diesel engine combined with a multi-fuel system. By using the control method for the composite fuel injection system, a mechanical fuel injection subsystem and a high-pressure common-rail electronic control fuel subsystem work cooperatively, the correct timing, the flow and the frequency of electronic control fuel injection are regulated by opening and closing an electromagnetic valve, so that various fuel injection laws such as pre-injection, after-injection and speed-increasing main injection are realized; and disturbance of gas in a cylinder can be further strengthened by injection of two fuel injection nozzles, and combustion is promoted. A fueling and atomizing mode of the high-pressure common-rail electronic control fuel subsystem is different from a fueling and atomizing mode of the mechanical fuel injection subsystem. The existing mechanical fuel injection marine medium-speed or low-speed diesel engine can be upgraded under the condition of low cost, and the economical efficiency and the emission performance of the diesel engine are improved.
Description
technical field [0001] The invention relates to a control method of a composite fuel injection system, in particular to a fuel injection system and a control method of a medium-low speed diesel engine of a ship combined with multiple fuel injection systems. Background technique [0002] At present, the existing fuel injection systems for medium and low-speed diesel engines in ships are roughly divided into mechanical fuel injection systems and electronically controlled fuel injection systems. The traditional mechanical fuel injection system adjusts the circulating fuel supply by adjusting the starting point of the fuel pump plunger compression stroke, which cannot realize the flexible control of fuel injection quantity, injection timing and injection pressure, and cannot meet the increasingly stringent emission regulations. In recent years, the electronically controlled fuel injection system, especially the high-pressure common rail electronically controlled fuel injection s...
Claims
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Login to View More IPC IPC(8): F02D1/02F02D41/10
Inventor 隆武强田华田江平
Owner DALIAN UNIV OF TECH