HIGH TEMPERATURE SENSOR COMPRISING THERMOCOUPLES WITH COMMON HOT JUNCTION

摘要

The subject of the present invention is a temperature sensor (1) for a motor vehicle comprising: - a thermocouple (2) comprising a first metal wire (3a) and a second metal wire (3b) of different nature welded together at their first end (4a, 4b) forming a hot weld (7) to measure a temperature T1 in the vehicle, the metal wires (3a, 3b) each comprising a second end (5a, 5b) electrically connected to a voltmeter measuring the voltage between the two second ends (5a, 5b) to determine the temperature T1, - an insulating sheath surrounding the two metal wires (3a, 3b), and - a protective casing (17) in which the hot solder (7) is housed. According to the invention, the temperature sensor (1) comprises at least a third metal wire (3c) comprising a first end (4c) welded to the hot solder (7) of the thermocouple (2) for measuring the temperature T1 in the vehicle , the third metal wire (3c) comprising a second end (5c) electrically connected to the voltmeter measuring the voltage between the second end (5c) of the third metal wire (3c) and the second end (5a, 5b) of one of the first two metallic wires (3a, 3b) to determine the temperature T1.