Method for improving maneuverability of marine diesel engine propulsion system

Abstract

The invention discloses a method for improving maneuverability of a marine diesel engine propulsion system. The method comprises the following steps: step 1, loading according to a set loading rate; 2, according to the real-time rotating speed and load of the propulsion diesel engine, comparing the real-time rotating speed and load of the propulsion diesel engine with a propulsion diesel engine load limiting line to judge the overload limiting line trend condition, and if the overload limiting line trend exists, executing the step 3; if the overload limit line trend is relieved, executing the step 4 until acceleration loading is completed; step 3, load active control screw pitch reduction: propulsion monitoring still sends a rotating speed instruction to a propulsion diesel engine in real time at a preset speed increasing speed to carry out rotating speed adjustment; meanwhile, a pitch reduction instruction is sent to the controllable-pitch propeller to carry out pitch reduction operation, and the second step continues to be carried out; 4, the load actively controls the pitch rising, wherein propelling monitoring still controls the rotating speed of the propelling diesel engine at the preset increasing rotating speed rate; and a pitch raising instruction is sent to the controllable-pitch propeller for pitch raising operation, and the second step continues to be carried out.

Description

technical field [0001] The invention belongs to the technical field of ship engine propulsion, in particular to a method for improving the maneuverability of a ship diesel engine propulsion system. Background technique [0002] The characteristic curve of the marine propulsion diesel engine specifies the operating area of ​​the diesel engine. If the operating area is exceeded during use, the diesel engine will run overloaded, which will cause serious failures such as excessive exhaust temperature of the diesel engine, turbocharger surge, and even cylinder scuffing. . In order to ensure that the diesel engine does not appear overloaded under various operating conditions, load limit lines are usually set. When the mobility requirements of the propulsion system are very high, it is easy for the power of the propulsion diesel engine to exceed the load limit line during the acceleration loading process. The general method is to reduce the maneuverability to avoid overloading; wh...

AI Technical Summary

Problems solved by technology

When the mobility requirements of the propulsion system are very high, it is easy for the power of the propulsion diesel engine to exceed the load limit line during the acceleration loading process. The general method is to reduce the maneuverability to avoid overloading; when overloading occurs, stop increasing the diesel engine. Speed, wait for the load of the diesel engine to decrease with the increase of the ship speed, and then continue to increase the speed, which greatly affects the maneuverability of the propulsion system, and even the load limit during the acceleration process between the two gear orders, resulting in the inability to run to the required vehicle. order, loading failed

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