Thomas Birkhofer

Selective impedance based gas sensors for hydrocarbons using ZSM-5 zeolite films with chromium(III)oxide interface

Device for Determining the State of a Soot Particle Filter

Sensor for directly determining the state of a NOx storage catalyst

Catalyst status detection method e.g. for NOx storage catalyst, involves having interior of housing of catalyst having gas in it and having quality measure of cavity for gas with resonant frequency decreased as measure of increase of NOx

Method for identifying the state of an NOx storage catalyst

Apparatus and method for determining the loading status of a particulate filter

Method for monitoring the state of a carbon filter especially for a diesel engine has parts of electrodes near to or on the inner walls of the filter to monitor changes in resistance or impedance

Sensor and method for monitoring and controlling catalysts, especially motor vehicle catalysts

Method of operating a diesel particle filter

Exhaust system for internal combustion (IC) engine, makes particulate sensors on upstream side of particulate filter independently operable with respect to their reference conditions