Method for determining component concentration of gas in measuring gas chamber of motor vehicle, involves completing evaluation of parameter of gas from measured current and measured voltage change that occurs due to current change

摘要

The method involves applying voltage (Up) to a pump cell (118) comprising two electrodes (114, 116) and a solid electrolyte (112) in a measuring phase, where one of the electrodes (114) is arranged in a hollow chamber (120). Current (Ip) i.e. limiting current is measured by the pump cell in the measuring phase. The current is changed around a predetermined value in another measuring phase. Voltage change occurring due to the current change is measured. Evaluation of a parameter of a gas is completed from the current and voltage change. An independent claim is also included for a sensor arrangement for determining a parameter of an exhaust gas in a measuring gas chamber.