Temperature Measuring Method

摘要

A fuel cell system comprising a controller, a temperature sensor that has a physical presence in a conduit within the system to measure the temperature of the fluid at a point within the conduit (Tg) and a wall temperature sensor for sensing a temperature of a wall of the conduit (Tw). The controller takes Tg and Tw as inputs and applies an equation with known constants to calculate measurement error of Tg based on the local flow temperature and geometry and arrives at a calculated temperature. The equation may be applied iteratively until the difference between the calculated temperature and Tg is below an acceptable value when the calculated temperature can then be assumed to be an accurate representation of the actual gas temperature at the Tg measurement point. The direction of calculation is controlled by the relative difference between Tg and Tw.

主权项

1. A fuel cell system comprising:
a controller; a temperature sensor that has a physical presence in a conduit within the system; and a wall temperature sensor for sensing a temperature of a wall of the conduit; the controller operative to iteratively apply a thermal model to calculate a predicted temperature value that is, based on temperature values measured using the temperature sensor in the conduit and the wall temperature sensor, expected to be measured; wherein, when in an iterative step the predicted temperature value does not fulfil an interrupt criterion, an input temperature value used in a next iterative step is altered based on a difference between the temperatures measured by the sensors.