Low speed diesel propulsion engine for ships
RTA SERIES: 6800-12800 kW H. Cegielski-Poznan

RT-Flex - Intelligent engines
Silniki

These engines are equipped with high pressure rails of fuel and oil (common rail) and electronic control.

The designed rails offer new options as far as the engine design and operation are concerned, among the others they:

1. Simplified mechanical subassemblies of the engine.
2. Introduced flexibility of injection and valves operation.
3. Increased movement dependability of the engine due to the use of the double engine safety system.
4. Gave higher efficiency in comparison to traditional engines.
5. Introduced many options of reducing exhaust gas emission.

In the engines of "flex" type the designers resigned from such generally used so far designing schemes like:

1. Fuel pumps of SULZER construction - one big pump for one cylinder.
2. Overload valves (forward - backward).
3. Distribution shaft.
4. Overload actuator.
5. Distribution shaft drive (three or four gear wheels of ~1500 mm diameter).

Rejecting the above subassemblies allowed to introduce innovative designing solutions, e.g.:

1. Injection pumps of Bosch type - for example for 7-cylinder engine there are just three small pumps generating fuel pressure for the rail.
2. The fuel rail - capable of keeping fuel pressure of ~1000 bar.
3. Injection control assembly - small hydraulic device enabling precise control of the injection parameters.
4. Oil rail - powered with two small piston pumps (for 7-cylinder engine), in which the pressure of ~200 bar is maintained.