The MAN 32/40 PGI, a Synthesis of the Otto and Diesel Cycles

Authors

Dr.-Ing. R. Marquard, Dr.-Ing. Dipl.-Wirt. Ing. A. Hanenkamp, MAN Diesel SE, Augsburg

Year

2008

Print Info

Fortschritt-Berichte VDI, Reihe 12, Nr. 672

Summary

Global energy needs will rise sharply over the next few years. Technologies must therefore be developed that enable us to convert energy efficiently and with minimum CO2 emissions.


Given their basic thermo-dynamic processes, power plants with large gas engines can operate with optimum efficiency. The architectures of large diesel engines with high potential for high mean pressure levels, high compression ratios and high turbocharging pressure ratios are used as the basic engines in such cases. The combustion process used with the gas engines is the lean-burn Otto process with mixture compression. The lean gas/air mixture is ignited either by spark plugs or injection of a small volume of self-igniting diesel.


The ignition energy of the spark plugs must be increased dramatically to allow increases in mean pressures, as a result of which wear on the spark plugs increases disproportionally.


Full exploitation of the mean pressure potential is thus problematic from an economic standpoint. The PGI (Performance Gas Injection) process developed by MAN uses a high level of ignition energy to ignite very lean mixtures. This produces low NOx emissions coupled with high efficiency. Since it is able to achieve leaner mixtures, the PGI process also enables the engine operating window to be widened. MAN Diesel SE has systematically developed the idea behind the process from research status into volume production. When compared with the competition, as an ignition process for gas engines the PGI process is a unique selling point for MAN Diesel and an extremely attractive product for the customer.

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