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The development and the adaptation of the contact-less pyrometer technique for gas exchange valves at operating combustion engines has enabled a new standard of possibilities for the compensation of the calculation process which up to present had not been reached. This presentation will capture the theoretical side of contact-less pyrometer measurements as well as the instrumentation of a certain engine. The results of the investigations and the influence on FEM-temperature field calculations are shown in examples. This lecture will point out the miscellaneous options to benefit from this new temperature measurement method in the development process of small combustion engines.

Recently, control of the gas-exchange process has come into focus as a critical element of the development process for internal combustion (IC) engines. The information learned in various engine development organizations worldwide has recently been put into practice via the introduction of many variable valve control strategies. The intention of these strategies ranges from simple enhancement of volumetric efficiency to completely controlling the combustion process at various engine speeds. The challenge to engine designers is mainly to reduce the relatively high masses of the valve actuating elements while increasing the stiffness to positively affect the dynamic behavior of the valve actuation system. Other benefits of a light-weight valve train is the reduction of the required energy to displace the valve element, which results in a more compact (lighter) cylinder head construction.

In the past years military tacticians have identified the need for virtually all vehicles to utilize similar fuels (namely kerosene). While this has not been a problem for more conventional vehicles that typically utilize diesel and turbine engines, the challenge has been extreme for light-weight unmanned aerial vehicle (UAV) engines. This class of vehicles has previously used two-stroke gasoline engines for their high specific output, small frontal area, and low mission weight. The contents of this paper highlights the design and development efforts of Schrick GmbH in the introduction of a special application engine for UAV's. The paper also discusses the technical challenges that had to be met to achieve specific power, weight, packaging, fuel consumption, and durability targets. This diesel is unique in that it has a total weight of 24kg while achieving 34 kW output.