Marine diesel engine in model development overall look relatively stable, a few years ago, focused on improving machine reliability and this is because the supercharging technology development, the diesel engine is enhanced to improve quickly, especially after the oil crisis, reflected in the lower fuel consumption rate and the gasification of inferior fuel oil as the goal of economy strong pursuit, the increasingly severe environmental policies on diesel engine emissions limits, and the increase of harmful emissions such as NOx, SO2 is high strength and a byproduct of burning poor quality fuel oil, and the content of these harmful emissions components, Marine diesel engine is even more than a car engine.

Each diesel engine manufacturer is working on the following common pursuit of new diesel engine.

(1) reliability of continuous service.

(2) highly intensified.

That is to substantially increase its maximum combustion pressure and fuel injection pressure.

(3) exhaust emissions comply with increasingly stringent emission regulations.

In 1997, the ship began to implement the emission limits set by IMO, and the diesel engine manufacturers adopted the operating conditions to control or take the exhaust gas, and even redesigned it to comply with the regulations.

(4) good overall economy.

It is not only the consumption of fuel consumption and the use of inferior fuel, but also the price, operation cost, saving power, less maintenance and efficiency.

(5) the overall structure tends to be the same.

The cylinder arrangement is dominated by the direct column and the v-shape, which is both the technical target and the requirement of the economic target.

(6) standardized interface.

To meet the requirements of users, suitable for different auxiliary devices and monitoring system application.

High-power low-speed diesel engines are widely used in bulk ships, oil tankers, container ships and other large ocean-going ships.

Due to the increasingly large scale, the giant ship and automation and the requirements of the economy, the reliability of the ship's host is increasing day by day, high-power two-stroke low-speed diesel engine presents a trend of global optimization of technology development, embodied in the following aspects:

(1) single machine, single cylinder power is getting bigger and bigger, single machine can reach up to 110,000 horsepower.

(2) further reduce the fuel consumption rate, and the fuel consumption rate of the two-stroke low-speed diesel engine has been reduced to 164g/ kW·h.

(3) the average effective pressure has reached 1190-1195mpa, and the explosion pressure is 1510-1515mpa.

(4) a new type supercharger with high pressure ratio and high efficiency, such as the 4P supercharger developed by ABB, has a pressure ratio up to 5:1.

(5) using electronic governor system, electronic control fuel injection system, high pressure common rail fuel injection system, intelligent electronic control system, further improve the reliability of diesel engine at low speed, improve the low load performance, reduce fuel consumption, controlling NOx emissions, as well as safety control and so on.