MAGNETIC SENSOR AND DIAGNOSTIC METHOD THEREOF, AND ROTATION DETECTION DEVICE USING THE SAME

• Main Authors: UEMURA TAKESHI, OSABE AKIRA, TOMITA TAKUYA, FUJIURA HIDEAKI
• Format: Patent
• Language: English; Japanese
• Published: 26.12.2019
• Subjects: ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVEREDIN A SINGLE OTHER SUBCLASS; LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS; MEASURING; MEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR; MOTOR VEHICLES; PERFORMING OPERATIONS; PHYSICS; TARIFF METERING APPARATUS; TESTING; TRAILERS; TRANSPORTING

To enhance the reliability in the diagnosis of a magnetic sensor.SOLUTION: The magnetic sensor includes: a first magnetic resistance element that outputs a first detection signal; and a detection circuit to which the first detection signal is input. Here, the detection circuit includes: a regulator 60a for supplying a first potential to the first magnetic resistance element; a first current path electrically connecting the first magnetic resistance element and the regulator therebetween; a second current path having a first resistance which electrically connects the first magnetic resistance element and the regulator therebetween; a first switch for switching the first current path and the second current path; and diagnostic circuits 90, 91 which are connected to the second current path.SELECTED DRAWING: Figure 8 【課題】磁気センサの診断の信頼性を高める。【解決手段】磁気センサは、第１検出信号を出力する第１磁気抵抗素子と、第１検出信号が入力される検出回路と、を備える。ここで、検出回路は、第１磁気抵抗素子に第１電位を供給するレギュレータ６０ａと、第１磁気抵抗素子とレギュレータとの間を電気的に接続する第１電流経路と、第１磁気抵抗素子とレギュレータとの間を電気的に接続し、第１抵抗を有する第２電流経路と、第１、第２電流経路を切り替える第１スイッチと、を有し、第２電流経路に接続される診断回路９０，９１と、を備える。【選択図】図８