Gas mixture, e.g. exhaust gas, composition recognition, for broadband lambda probe, involves modulating mixture in chamber for recognition of composition, and changing air ratio in chamber to change sensitivity of sensor for two gases

摘要

The method involves modulating a gas mixture which is supplied to a broadband lambda probe, in a measuring gas chamber for recognition of diffusion gas composition of the gas mixture. The air ratio in the chamber of a pump cell of the probe is periodically changed to change the sensitivity of the sensor for two gases. The Nernst voltage with a frequency of 5 hertz is modulated in a sinusoidal manner, such that the amplitude of the modulated signals amounts to 100 millivolt. Independent claims are also included for: (1) a method for operating a broadband lambda probe, and (2) a control device for operating a broadband lambda probe.