Page 46: of Maritime Reporter Magazine (September 2004)

Germany • SMM Preview

A Benchmark in Electronic Fuel Injection

MAN B&W Debuts 32/40CR Engine

Common rail diesel technology is designed to be reliable, clean, economic, durable — and in the MAN Group it is now available for the engine of a small truck up to a large marine diesel. For service on the high seas the electronic injection system has again been improved. "Now this technology is where we wanted to have it," says Fritz

Rape, Member of the Executive Board of MAN B&W. This in-house develop- ment combines conventional compo- nents of existing MAN injection sys- tems with up-to-date hydraulic and elec- tronic elements that have been devel- oped further. "It was a strategic decision to develop common rail for our engines ourselves in order to do better than what would have been possible with existing, external systems," said Pape. The result is the new engine type 32/40CR that is now being presented in Saalfelden,

Austria.

Smoother performance, lower emis- sions, lower consumption, flexible application in the respective area of usage: These are the most important advantages of common rail technology.

Now this MAN technology that is well- established in the truck sector is also available for MAN B&W's four-stroke engine range. "In developing our injec- tion systems we have been able to build on many years of experience," said the

Head of Research & Development, Dr.

Ralf Marquard. Already in 1979 the company had begun to develop common rail engines that went into serial produc- tion. Marquard and his team have stud- ied the different systems and have adapt- ed and optimized the technology with regard to the size of the engines and the particular demands of maritime usage.

At MAN Nutzfahrzeuge AG, a sister company, common rail technology has been successfully applied for just over two years: approximately 9,000 MAN trucks are already on the road with this modern injection system.

In common rail diesel engines fuel is injected into all the cylinders via a "common rail". The generation of pres- sure and injection of fuel are not inter- connected in a common rail system.

Unlike in conventional systems, the injection pressure is independent of the engine speed. Thus there is always full pressure available. The fuel is first stored in the fuel line and then, when a signal is given by the engine controls to the magnetic valves, it is injected into the cylinders. This creates an extremely fine fuel-air mixture that is designed to burn particularly efficiently. The chal- lenge was to apply this injection system to large marine engines, and to adapt it for operation on heavy fuel oil, which means dealing with a fuel heated to approximately 150°C. The MAN injec- tion system is based on conventional pressure-controlled injection. In usual stroke-controlled systems there is a per- manently high pressure of 1,600 bar, for example, at the needle seat near the combustion chamber. In the MAN B&W system, the pressure on the valve needle is released by means of the solenoid valve controls that is located away from the cylinder head, at the common rail accumulator. As a result there is not per- manently full pressure on the valve nee- dle seat next to the combustion chamber and the electronic components are pro- tected. (Continued on page 47)

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September 2004 45