What special environmental factors and usage requirements should be considered when using electronic fuel injection diesel engines in ships?

When applying electronic fuel injection diesel engines in the field of ships, the following special environmental factors and usage requirements need to be considered:

1、 Environmental factors

Humidity and salt spray

Ships have been sailing on water for a long time, and the surrounding environment has high humidity. The electronic components of electronic fuel injection diesel engines are easily affected by humid air, leading to short circuits or corrosion. Salt spray is also an important factor, as the salt in seawater forms salt spray in the air, which can corrode the metal components and electronic control systems of diesel engines. For example, salt spray may corrode sensor pins and wiring terminals in electronic fuel injection systems, affecting the accuracy of signal transmission.

The response measures include adopting sealed design for key components of electronic fuel injection diesel engines, and adding moisture and salt spray inspection and maintenance for electronic components in the ship's maintenance plan, such as regular cleaning and application of protective grease.

Vibration and Swing

Ships are affected by factors such as wind and waves during navigation, resulting in vibrations and swaying. This is a challenge for the installation stability and internal component connection reliability of electronic fuel injection diesel engines. Continuous vibration may cause loosening of components such as fuel injectors and high-pressure fuel pipes in the electronic fuel injection system, affecting the accuracy of fuel injection.

To cope with this situation, special shock-absorbing mounting brackets need to be used to fix the diesel engine, and anti loosening design should be adopted for connecting components such as oil pipes, such as using self-locking pipe joints. At the same time, regular inspections of these components should be strengthened to ensure a firm connection.

temperature variation 

The area of ship navigation is wide and may experience significant temperature changes. From cold polar seas to hot tropical seas, the performance of electronic fuel injection diesel engines is significantly affected by temperature. In low-temperature environments, the viscosity of fuel increases, which may affect the fuel injection effect; In high temperature environments, the heat dissipation of electronic components becomes a problem, which may lead to overheating and damage.

Therefore, marine electronic fuel injection diesel engines need to be equipped with effective cooling systems and heating or insulation measures should be taken for the fuel system, such as installing heating devices at the fuel filter to ensure that fuel can be injected normally at different temperatures.

2、 Usage requirements

Power and torque characteristics

Ships have different requirements for the power and torque of diesel engines under different navigation conditions, such as departure, cruising, and docking. An electronic fuel injection diesel engine needs to be able to quickly adjust its power output according to changes in the ship's load, providing sufficient torque to propel the ship forward or maintain its sailing speed. Its electronic control system needs to accurately match the propeller characteristic curve of the ship to ensure efficient power transmission.

Fuel quality and supply stability

Ships need to carry a large amount of fuel and the fuel supply cannot be interrupted while sailing at sea. Electronic fuel injection diesel engines have high requirements for fuel quality, such as fuel cleanliness, water content, etc. Fuel with high impurities may clog the fuel injectors, affecting the injection efficiency. At the same time, the fuel supply system needs to have good stability to prevent fuel supply interruption during ship swaying or shaking, so reliable fuel transfer pumps and buffering devices need to be equipped.

Safety and reliability requirements

Due to ships sailing at sea and being far from land, the safety and reliability of electronic fuel injection diesel engines are crucial. Once a malfunction occurs, it may cause the ship to lose power and fall into a dangerous situation. Therefore, marine electronic fuel injection diesel engines need to have redundant designs, such as dual ECU systems (electronic control units) or backup mechanical control modes, and be easy to maintain. The ship needs to be equipped with sufficient maintenance tools and commonly used spare parts, and the crew needs to undergo professional training to quickly diagnose and handle common faults.