FUEL CELL STACK COOLANT CONDUCTIVITY SENSOR USING DIFFERENTIAL VOLTAGE MEASUREMENTS

FUEL CELL STACK COOLANT CONDUCTIVITY SENSOR USING DIFFERENTIAL VOLTAGE MEASUREMENTS

A method and apparatus for detecting leakage current in the coolant of a fuel cell stack. The invention eliminates the use of a conductivity sensor by using a voltmeter to measure the voltage across the coolant. If the coolant voltage is at or below a predetermined level, an excessive level of condu...

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1. Verfasser: HORTOP, MATTHEW K
Format: Patent
Sprache:eng ; fre
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BASIC ELECTRIC ELEMENTS
ELECTRICITY
PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSIONOF CHEMICAL INTO ELECTRICAL ENERGY
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creator HORTOP, MATTHEW K
description A method and apparatus for detecting leakage current in the coolant of a fuel cell stack. The invention eliminates the use of a conductivity sensor by using a voltmeter to measure the voltage across the coolant. If the coolant voltage is at or below a predetermined level, an excessive level of conductivity in the coola nt exists, and the presence of leakage current is reported. The invention can also compare the coolant voltage to two different predetermined voltage levels, the second on e higher than the first. A coolant voltage at or below the lower voltage level could signal a shut down of the stack, while a coolant voltage at or below the higher volta ge level could signal an alarm or another diagnostic. The invention can optionally us e a second voltmeter to measure the voltage across the stack and calculate the resistivity and conductivity of the coolant.
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The invention eliminates the use of a conductivity sensor by using a voltmeter to measure the voltage across the coolant. If the coolant voltage is at or below a predetermined level, an excessive level of conductivity in the coola nt exists, and the presence of leakage current is reported. The invention can also compare the coolant voltage to two different predetermined voltage levels, the second on e higher than the first. A coolant voltage at or below the lower voltage level could signal a shut down of the stack, while a coolant voltage at or below the higher volta ge level could signal an alarm or another diagnostic. The invention can optionally us e a second voltmeter to measure the voltage across the stack and calculate the resistivity and conductivity of the coolant.</abstract><edition>7</edition><oa>free_for_read</oa></addata></record>
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subjects BASIC ELECTRIC ELEMENTS
ELECTRICITY
PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSIONOF CHEMICAL INTO ELECTRICAL ENERGY
title FUEL CELL STACK COOLANT CONDUCTIVITY SENSOR USING DIFFERENTIAL VOLTAGE MEASUREMENTS
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