Turbo rotation sensor and turbocharger
First Claim
1. A turbo rotation sensor for being mounted on a turbocharger to detect a rotational speed of a compressor wheel, the turbocharger comprising a turbine provided on an exhaust gas path of a vehicle internal combustion engine and comprising a turbine wheel rotationally driven by exhaust gas from the internal combustion engine and a compressor provided on an air intake path of the internal combustion engine and comprising the compressor wheel rotationally driven by rotation of the turbine wheel and a housing for housing the compressor wheel, the turbo rotation sensor comprising:
- a magnet magnetized with two different magnetic poles along a circumferential direction about a rotating shaft of the compressor wheel and provided at an end portion of the compressor wheel on the air intake side so as to rotate together with the compressor wheel, the magnet having a first shape along a first axial side, and a second shape different form the first shape along a second axial side; and
a sensor assembly that is housed in a sensor hole formed on the housing, is arranged to face the magnet in a radial direction of the rotating shaft, and comprises two magnetic field sensors capable of measuring variation in magnetic flux density caused by the magnet,wherein the two magnetic field sensors are serially aligned in a direction parallel to the rotating shaft so that the respective detection axes are parallel to an axial direction of the rotating shaft,wherein the rotational speed of the compressor wheel is detected based on a difference between the magnetic field strengths detected by the two magnetic field sensors,wherein one of the magnetic field sensors is arranged to face, in the radial direction, the first shape of the magnet on the first axial side in the axial direction, andwherein the other of the magnetic field sensors is arranged to face, in the radial direction, the second shape of the magnet on the second axial side in the axial direction.
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Accused Products
Abstract
A turbo rotation sensor includes a magnet magnetized with two different magnetic poles along a circumferential direction about a rotating shaft of a compressor wheel and provided at an end portion of the compressor wheel on the air intake side, and a sensor portion that is housed in a sensor hole formed on the housing, is arranged to face the magnet in a radial direction of the rotating shaft, and includes two magnetic field detecting elements capable of measuring variation in magnetic flux density caused by the magnet. The two magnetic field detecting elements are aligned in a direction parallel to the rotating shaft so that the respective detection axes are parallel to an axial direction of the rotating shaft. The rotational speed of the compressor wheel is detected based on a difference between the magnetic field strengths detected by the two magnetic field detecting elements.
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Citations
11 Claims
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1. A turbo rotation sensor for being mounted on a turbocharger to detect a rotational speed of a compressor wheel, the turbocharger comprising a turbine provided on an exhaust gas path of a vehicle internal combustion engine and comprising a turbine wheel rotationally driven by exhaust gas from the internal combustion engine and a compressor provided on an air intake path of the internal combustion engine and comprising the compressor wheel rotationally driven by rotation of the turbine wheel and a housing for housing the compressor wheel, the turbo rotation sensor comprising:
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a magnet magnetized with two different magnetic poles along a circumferential direction about a rotating shaft of the compressor wheel and provided at an end portion of the compressor wheel on the air intake side so as to rotate together with the compressor wheel, the magnet having a first shape along a first axial side, and a second shape different form the first shape along a second axial side; and a sensor assembly that is housed in a sensor hole formed on the housing, is arranged to face the magnet in a radial direction of the rotating shaft, and comprises two magnetic field sensors capable of measuring variation in magnetic flux density caused by the magnet, wherein the two magnetic field sensors are serially aligned in a direction parallel to the rotating shaft so that the respective detection axes are parallel to an axial direction of the rotating shaft, wherein the rotational speed of the compressor wheel is detected based on a difference between the magnetic field strengths detected by the two magnetic field sensors, wherein one of the magnetic field sensors is arranged to face, in the radial direction, the first shape of the magnet on the first axial side in the axial direction, and wherein the other of the magnetic field sensors is arranged to face, in the radial direction, the second shape of the magnet on the second axial side in the axial direction. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A turbocharger, comprising:
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a turbine provided on an exhaust gas path of a vehicle internal combustion engine and comprising a turbine wheel rotationally driven by exhaust gas from the internal combustion engine; a compressor provided on an air intake path of the internal combustion engine and comprising a compressor wheel rotationally driven by rotation of the turbine wheel and a housing for housing the compressor wheel; and a turbo rotation sensor mounted on the turbocharger to detect a rotational speed of the compressor wheel, wherein the turbo rotation sensor comprises; a magnet magnetized with two different magnetic poles along a circumferential direction about a rotating shaft of the compressor wheel and provided at an end portion of the compressor wheel on the air intake side so as to rotate together with the compressor wheel; and a sensor assembly that is housed in a sensor hole formed on the housing, is arranged to face the magnet in a radial direction of the rotating shaft, and comprises two magnetic field sensors capable of measuring variation in magnetic flux density caused by the magnet, wherein the two magnetic field sensors are serially aligned in a direction parallel to the rotating shaft so that the respective detection axes are parallel to an axial direction of the rotating shaft, wherein the rotational speed of the compressor wheel is detected based on a difference between the magnetic field strengths detected by the two magnetic field sensors, wherein the magnet has first and second axial sides serially aligned along the rotating shaft, each side of which has a different maximum radial extent, wherein one of the magnetic field sensors is arranged to face, in the radial direction, the first axial side of the magnet in the axial direction, and wherein another of the magnetic field sensors is arranged to face, in the radial direction, the second axial side in the axial direction. - View Dependent Claims (11)
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Specification