Microcontroller-based fuel injection control device for marine diesel engines

Abstract

The invention provides a microcontroller-based ship diesel main engine assisted jet control device. The device comprises a reduction gear box, a main engine remote control device, an electronic speed controller, a controller, an assisted jet electromagnetic valve and compressed air. The output ends of the reduction gear box, the main engine remote control device and the electronic speed controller are respectively electrically connected to the input end of the controller; the output end of the controller is electrically connected to the assisted jet electromagnetic valve; the assisted jet electromagnetic valve is mounted on an air supplement pipe of the diesel main engine; and the air supplement pipe is connected to a volute at an air compressor end of a turbocharger. After the assisted jet electromagnetic valve is electrified to act, the compressed air flows to an air compressor impeller via the air supplement pipe so as to increase the air capacity and accelerate the turbocharger; in such way, the inlet manifold of the diesel engine obtains the needed pressurized air pressure, and the assisted jet of the ship diesel main engine is realized. The control device provided by the invention monitors the rotation speed of the diesel engine, the starting air pressure, the scavenging pressure and the load of the diesel engine real time, and has the advantages that the assisted jet effect is good, the combustion situation of a combustion room can be improved, the exhaust pipe pollutions of the diesel engine are reduced and the like.

Description

technical field [0001] The invention relates to the field of controllers, in particular to a fuel injection controller for a marine diesel engine, which is based on a micro-controller and belongs to the technical field of shipbuilding. Background technique [0002] In recent decades, supercharging technology has been widely used in large and medium-sized marine diesel engines, especially the development of exhaust gas turbocharging technology has greatly improved the performance of diesel engines. But with the further application of supercharging technology, the transient response performance of supercharged diesel engine and the emission of diesel engine are becoming more and more serious. For example, the supercharging effect of the exhaust gas turbocharger is not ideal when the load suddenly increases, because when the load suddenly increases, the governor will increase the fuel supply of the main engine through the PID calculation output control signal, but at this time ...

AI Technical Summary

Problems solved by technology

The Lambda controller is mainly used to assist the injection of diesel generators with heavy loads. Since the power generation diesel engine does not have the phenomenon of combined discharge, the Lambda controller is designed without distinguishing between the large load of combined discharge and the large load generated during operation.

In addition, the diesel engine has high power and complicated working conditions, so the Lambda controller is not suitable for the injection-assisted control of the marine diesel engine; the Lambda controller adopts a mechanical structure design, the installation is complicated, and the adjustment and maintenance during use are also very cumbersome

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