Method for measuring temperature of ammonia contained in reducing agent tank of selective catalytic reduction catalyst system for motor car, involves forming predictor from conductance, and evaluating predictor for concluding temperature

摘要

The method involves detecting a variable, which characterizes current, voltage, resistance of a positive temperature coefficient (PTC) element during operation of a heating device (18). A conductance is formed from detected values as a quotient of current and voltage. A predictor is formed from the conductance based on time as an integral of the conductance. The predictor is evaluated for concluding a temperature of a medium. The conductance is used at beginning of measurement for calibration of temperature measurement. Independent claims are also included for the following: (1) a computer program comprising instructions for performing a method for measuring temperature of a medium (2) a temperature sensor for a container with medium.