Servo driving system for fuel booster pump and exhaust valve of low-speed diesel engine

Abstract

The invention provides a servo driving system for a fuel booster pump and an exhaust valve of a low-speed diesel engine. The servo driving system comprises an electro-hydraulic reversing valve, a hydraulic oil cylinder, the fuel booster pump and the exhaust valve. The electro-hydraulic reversing valve comprises a pilot valve, a main valve and a valve core displacement sensor, the hydraulic oil cylinder comprises a cylinder body, a hydraulic piston, a piston rod and a piston displacement sensor, the fuel booster pump comprises a pump body, a plunger, a sleeve, an oil suction electromagnetic valve and an oil outlet valve, the exhaust valve comprises an execution piston, an air piston, a hydraulic oil overflow valve, an air overflow valve, a valve rod and a valve seat, when exhaust starts, hydraulic oil on the lower side of the hydraulic piston is compressed to the upper side of the execution piston of the exhaust valve, the execution piston pushes the valve rod under pressure of the hydraulic oil to open the valve seat, and the valve seat drops through gas pressure at the air piston when exhaust ends. According to the system, the fuel booster pump and the exhaust valve of the dieselengine achieve electronic control through the servo system, the fuel injection amount, fuel injection timing and exhaust timing are accurately controlled, and the space of the servo system is saved.

Description

technical field [0001] The present disclosure relates to the field of electronic control of low-speed diesel engines, in particular to a servo drive system for fuel booster pumps and exhaust valves of low-speed diesel engines. Background technique [0002] Large-scale low-speed two-stroke diesel engines occupy an irreplaceable position in marine power plants because of their large unit power, good economy, and strong reliability. However, due to its large volume and weight, complex system and other characteristics, it is difficult to realize accurate electronic control. [0003] The fuel system and the exhaust system are the two core systems of the diesel engine. The mechanical cam drive of the traditional fuel booster pump and exhaust valve is canceled, so that the performance of both is not limited by the engine speed, and at the same time, precise electronic control of both is realized. , is the key to improving fuel economy and reducing emissions of diesel engines. Co...

AI Technical Summary

Problems solved by technology

However, due to its large volume and weight, complex system and other characteristics, it is difficult to achieve precise electronic control

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