Method for detecting heater core isolation valve status

Methods and systems are provided for monitoring a status of a heater core isolation valve (HCIV) housing in an engine coolant circuit including a first coolant loop and a second coolant loop. In one example, a method may include indicating degradation of the HCIV based on a difference between a firs...

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Bibliographische Detailangaben
Hauptverfasser:	Jentz, Robert Roy, Kalivarapu, Sridhar, Rejeti, Sitaram
Format:	Patent
Sprache:	eng
Schlagworte:	ANALOGUE COMPUTERS BLASTING CALCULATING COMBUSTION ENGINES COMPUTING CONTROLLING COMBUSTION ENGINES COOLING OF INTERNAL-COMBUSTION ENGINES COOLING OF MACHINES OR ENGINES IN GENERAL COUNTING ENGINE PLANTS IN GENERAL HEATING HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS LIGHTING MACHINES OR ENGINES IN GENERAL MECHANICAL ENGINEERING PHYSICS STEAM ENGINES WEAPONS
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Beschreibung
Zusammenfassung:	Methods and systems are provided for monitoring a status of a heater core isolation valve (HCIV) housing in an engine coolant circuit including a first coolant loop and a second coolant loop. In one example, a method may include indicating degradation of the HCIV based on a difference between a first coolant loop temperature and a second coolant loop temperature upon activation of coolant system pumps and deactivation of a positive temperature coefficient (PTC) heater housed in the cabin heating loop.