Horst Neidhard

TL;DR: In this paper, an oxygen sensor is located downstream of the catalytic reactor to determine oxygen content in the exhaust gases from the internal combustion engine, the oxygen sensor comprising an ion conductive solid electrolyte forming an ion concentration chain and having catalytically inactive contacts, connected to a detection circuit which provides an output signal in dependence on a signal from the sensor, the output signal operating an alarm, or a transducer which interferes with proper engine operation to force the operator to have the reactor repaired.

TL;DR: In this article, a closed, tubular element having a solid ion conductive electrolyte, an electron-conductive coating on the inner surface thereof, and a porous or fissured electron conductive layer on the outer surface of said solid electrolyte or on a part of said surface, part of the pores being macroporous, said layer being of a material which catalyzes the formation from said hot exhaust gases of those compounds that are thermodynamically stable at the exhaust temperature.

TL;DR: In this paper, an exhaust-gas-sensing element which is an oxygen concentration cell having a solid electrolyte with an electron-conductive surface on the side exposed to the reference air and a catalytic electronconductive layer containing micro pores which extend through to the solid electrolytes on the other surface which is adapted to be exposed to exhaust gases was made.

TL;DR: In this article, the output of an oxygen sensor is fed in parallel to the inputs of amplifiers having amplification in different portions of the sensor output range and having different gain, and the amplifier outputs are combined in a summing circuit.

TL;DR: In this article, an afterburner is formed as an after-burner to receive the exhaust gases and burn CO and unburned hydrocarbons; connected in series therewith, downstream, is a catalytic reactor to reduce nitrogen oxides.