Single-cylinder CV Engine for Friction Measurement in Fired Operation
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ngle-cylinder CV Engine for Friction Measurement in Fired Operation Friction measurements on internal combustion engines always present a great technical challenge. Especially crank angle resolved measurements directly on the piston cylinder unit of a fired commercial vehicle engine have not been possible so far. With a specially developed floating liner engine, Rheinmetall Automotive is now making this possible. 16
AUTHORS © KS Kolbenschmidt
Jochen Schumacher is Global Technical Specialist Base Engine & Tribology at KS Kolbenschmidt GmbH in Neckarsulm (Germany).
Edward Werninghaus is Global Head of Innovations at KS Kolbenschmidt GmbH in Neckarsulm (Germany).
MOTIVATION
Ever stricter fuel consumption and emission legislation, combined with the necessary economic efficiency of Com mercial Vehicles (CV), is forcing manu facturers of heavy-duty vehicles to fur ther improve the powertrain. To achieve this goal, manufacturers and their suppli ers are working on implementing various solutions as quickly as possible. There fore, the further optimization of the mechanical efficiency of the combus tion engine is a promising approach. The accurate and repeatable measure ment of the friction force is essential to optimize the mechanical efficiency of the internal combustion engine. This is why KS Kolbenschmidt GmbH, a Rheinmetall Automotive AG subsidi ary, is working on an innovation project to measure the friction of the piston cylin der unit in a fired CV engine. Besides striving to make the measuring system developed for this purpose as robust and reliable as possible, the focus was on ensuring sufficient accuracy of the friction force measured using piezoelec tric sensors and the Friction Mean Effec tive Pressure (FMEP) calculated from it. THE TESTING DEVICE
In the floating liner method, the friction caused by the piston cylinder unit is determined on a floating and low-fric MTZ worldwide 11|2020
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C OVER STORY Friction Minimiz ation
tion mounted cylinder liner. The reac tion forces, resulting from the friction, are measured by piezoelectric force sen sors and provide a measurement signal with high resolution with regard to crank angle. The results of the floating liner investigations are very helpful for the computer simulation and the interpreta tion of physical mechanisms acting on the systems, because the frictional effects from the piston cylinder unit can be eval uated independently from other engine components. It must be ensured at all times that the floating cylinder liner is free to move by a few micrometers in the axial direction, while at the same time a radial fixation must be ensured to absorb the resulting lateral forces.
The specially developed measuring sys tem is a single-cylinder CV diesel engine with a displacement of 2.15 l using the floating liner principle, FIGURE 1. The di mensions of the basic engine as well as the cylinder head and other add-on parts correspond to those of a CV engine cur rently in series production. The engine has a state-of-the-art common ra
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