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This paper presents advanced planar ZrO2 oxygen sensors being developed at Robert Bosch using a modified tetragonal partially stabilized zirconia (TZP) with high ionic conductivity, high phase stability and high thermo-mechanical strength. Green tape technology combined with highly automated thickfilm techniques allows robust and cost effective manufacturing of those novel sensing elements. Standardization of assembling parts reduces the complexity of the assembly line even in the case of different sensing principles. The sensor family meets the new requirements of modern ULEV strategies like fast light off below 10 s and linear control capability as well as high quality assurance standards. High volume production will start in 1997 for European customers.

In order to further improve the starting performance, smooth running, and exhaust-gas emissions from diesel engines, and to provide for immediate start, Robert Bosch GmbH has developed a new glow system. It comprises composite-ceramic sheathed-element glow plugs and a transistorized glow control unit. Due to its innovative heating principle with external heater element, and its very high glow-plug temperature, the composite-ceramic sheathed-element glow plug has a number of considerable advantages compared to the conventional ceramic and metal glow plugs.