Abstract: A conventional gasoline engine is retrofitted and calibrated to operate as a bi-fuel engine using Hydrogen as the second fuel. When operated with Hydrogen, which typically leads to a reduction of engine output power, the engine is preferably operated in a charged mode and in a lean mode with the engine throttle kept in a wide-open position during charged and lean mode operation resulting in a more efficient engine with a reduction of engine output power loss.

Abstract: A process and device for monitoring the chip-removing treatment of a workce by analyzing the sound emission detectable on the tool which is transformed into an electrical signal, filtered, and compared with respect to its amplitude determined over a predetermined period of time with a predetermined adaptable threshold value. The constituents contained in the sound emission signal of the continuous basic noise signal resulting from the cutting and friction noise, and of the pulse-type chip-break signals superposed with respect to this with a higher amplitude, are separated and separately analyzed and evaluated.