Coolant flow estimation by an electrical driven pump,申请号US20050304185-传众专利搜索

Coolant flow estimation by an electrical driven pump

申请公布号：US2007065690(A1)

申请号：US20050304185

申请日期：2005.12.15

申请公布日期：2007.03.22

申请人：

SCHAEFER SASCHA;LAUER JOHANNES;WEISPFENNING THOMAS;WILLIMOWSKI PETER;ISERMANN ROLF;MAIER OLIVER

发明人：SCHAEFER SASCHA;LAUER JOHANNES;WEISPFENNING THOMAS;WILLIMOWSKI PETER;ISERMANN ROLF;MAIER OLIVER

分类号：H01M8/04;G01F1/00

主分类号：H01M8/04

摘要：A thermal sub-system for a fuel cell system that uses pump characteristics to determine a required cooling fluid volume flow. An algorithm controls the speed of the pump to provide the desired volume flow of the cooling fluid for the system parameters. The algorithm determines a motor efficiency value based on a pump input power value and a pump speed value. The algorithm then determines a coefficient of power value based on the motor efficiency value, the pump input power value and the pump speed value. The algorithm then uses a look-up table to convert the coefficient of power value to a coefficient of flow value. The algorithm then calculates the volume flow based on the coefficient of flow value and the pump speed value.