Throttle device
A grip, a magnet 140 , and a substrate 150 are included. The grip is rotatable between positions where a throttle is fully closed and a position where the throttle is fully open with a rotating shaft as a center. The magnet 140 rotates integrally with the grip. The substrate 150 includes a plurality of Hall elements 165 and 175 , and is fixed to face the magnet 140 . The plurality of Hall elements 165 and 175 are disposed in such a way that magnetic flux densities different from each other are respectively applied to the plurality of Hall elements 165 and 175 when an external magnetic field acts in a state where the grip is located in the position where the throttle is fully closed.
1. A throttle device comprising:
a rotating body that is rotatable between a first position and a second position with a rotating shaft as a center;
a magnet that rotates integrally with the rotating body; and
a substrate that includes a plurality of magnetic sensors and that is fixed to face the magnet,
wherein:
the plurality of magnetic sensors are offset in a first direction intersecting with a second direction of a line of magnetic force of a magnetic field of the magnet in such a way that magnetic flux densities different from each other are respectively applied to the plurality of magnetic sensors when an external magnetic field acts in a state in which the rotating body is located in the first position;
disposing the plurality of magnetic sensors in such a way that magnetic flux densities different from each other are respectively applied to the plurality of magnetic sensors is mutually offsetting the plurality of magnetic sensors in two directions in such a way that magnetic fields having magnitudes different from each other are applied from the magnet to the plurality of magnetic sensors, the two directions being a first direction of a line of magnetic force of a magnetic field and a second direction intersecting the first direction; and
offsetting the plurality of magnetic sensors in the first direction is disposing the plurality of magnetic sensors in positions different from each other on a plane of the substrate, and offsetting the plurality of magnetic sensors in the second direction is separately disposing the plurality of magnetic sensors on a front surface and a reverse surface of the substrate so that disposing the plurality of magnetic sensors in positions different from each other includes separating the plurality of magnetic sensors by using a thickness of the substrate.
2. The throttle device according to claim 1 , wherein
the substrate includes a plurality of integrated circuits that respectively include the plurality of magnetic sensors and that process outputs of the plurality of magnetic sensors, and
the outputs of the plurality of magnetic sensors that have been processed by the plurality of integrated circuits are output to an engine control unit included in a vehicle.
3. The throttle device according to claim 2 , wherein
the engine control unit calculates an output difference between the plurality of integrated circuits, and when the output difference exceeds a threshold that is set in advance, the engine control unit considers that the rotating body is located in the first position.
4. The throttle device according to claim 2 , wherein
the substrates includes:
an abnormality detector that calculates the output difference between the plurality of integrated circuits, and outputs an abnormal signal when the output difference exceeds a threshold that is set in advance; and
an amplifier that transmits an output of each of the plurality of integrated circuits to the engine control unit when the abnormality detector does not output the abnormal signal, and that reduces an output to be transmitted from at least one of the plurality of integrated circuits to the engine control unit and transmits the output when the abnormality detector outputs the abnormal signal.
5. The throttle device according to claim 4 , wherein
when outputs of the plurality of integrated circuits are transmitted, the engine control unit recognizes a position of the rotating body between the first position and the second position in accordance with the outputs of the plurality of integrated circuits, and when an output of at least one of the plurality of integrated circuits is reduced and transmitted, the engine control unit considers that the rotating body is located in the first position.
6. The throttle device according to claim 3 , wherein
the threshold is set to correspond to the position of the rotating body and to continuously or gradually increase according to a movement of the position from the first position to the second position in at least a portion of a section between the first position and the second position.
7. The throttle device according to claim 6 , wherein
the threshold has a minimum value when the rotating body is located in the first position.
8. The throttle device according to claim 1 , wherein
each of the plurality of magnetic sensors is one of a Hall element, a magnetoresistive element, a magnetic impedance element, and a superconductive quantum interference element.
9. The throttle device according to claim 1 , wherein
the rotating body is a grip, and
the first position is a grip position in which a throttle is fully closed, and the second position is a grip position in which the throttle is fully open.