A system and method for determining whether a resistor in a battery circuit on an electric vehicle cannot be used as a resistive heater for heating a cooling fluid for cooling the vehicle battery, but can used as a pre-charge resistor for starting the vehicle. A temperature sensor is provided proximate the resistor within the cooling fluid. The method turns on the resistor before turning on a coolant pump and samples the temperature at sample intervals over a predetermined period of time. The method then calculates an integral or differential of the sampled temperatures and compares that value with a calibrated threshold. If the temperature value is not greater than the threshold, meaning that the temperature indicates no cooling fluid is present, the algorithm disables the resistor for heating purposes, but maintains operation of the resistor for pre-charge purposes.
Enhanced HV pre-charge heater diagnostic detection system for liquid cooled HV battery packs
2015-08-04
Patent
Elektronische Ressource
Englisch
IPC: | G01N Untersuchen oder Analysieren von Stoffen durch Bestimmen ihrer chemischen oder physikalischen Eigenschaften , INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES / B60L PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES , Antrieb von elektrisch angetriebenen Fahrzeugen / H01M Verfahren oder Mittel, z.B. Batterien, für die direkte Umwandlung von chemischer in elektrische Energie , PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY |
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