Torque detection system and electric power steering apparatus
OwnerKaname AOKIinventor
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Abstract
A torque detection system that is less likely to affect external equipment is provided. A sensor IC in a torque detection device includes: a magnetic detection element with its output voltage changing in magnitude in accordance with the amount of twist of a torsion bar; and a processing device that converts the output voltage into an output signal switched between a low level L and a high level H. The processing device includes a signal generation device that forms inflection points P1 to P4 in order to reduce a change speed during a rising period T1 when the output signal is switched from the low level L to the high level H or a change speed during a falling period T3 when the output signal is switched from the high level H to the low level L.
Claims20
A torque detection system comprising:
- a magnetic material;
- a magnet with its relative position relative to the magnetic material changing in accordance with torque applied to a detection target;
- a sensor IC including a magnetic detection element with its output voltage changing in magnitude in accordance with a change in relative position between the magnetic material and the magnet and a processing device that converts the output voltage of the magnetic detection element into an output signal, the processing device switching the output signal between a low level and a high level corresponding to the output voltage of the magnetic detection element;
- and
- a control device that calculates the torque applied to the detection target based on the output signal output by the sensor IC, wherein
- the processing device includes a signal generation device that controls at least one of a change speed during a rising period in which the output signal is switched from the low level to the high level or a change speed during a falling period in which the output signal is switched from the high level to the low level.
Dependencies are inferred from the claim text.