Position detection device for vehicle and seat position detection device

Abstract

Provided are a position detection device for a vehicle, having a compact structure, capable of being produced at low cost, and capable of always detecting the absolute position of a movable body, located on the vehicle, moved from a reference position, and a seat position detection device. The position detection device (14) detects the position of the movable body, the movable body being that which is moved by driving force of a rotation drive source (70a). The position detection device (14) has a reduction gear (50) and a rotation sensor (51). The reduction gear (50) has a two-stage hypocycloid mechanism for reducing the number of rotations of a rotating shaft (41), rotated by a multiple number of times by the drive source (70a) when the movable body is moved, to not more than one. The rotation sensor (51) detects, as an absolute angle, a rotational output from the reduction gear (50). The position of the movable body is detected based on the absolute angle detected by the rotation sensor.

Description

technical field [0001] The present invention relates to a position detection device for a vehicle that detects the position of a moving body that is moved by a driving force of a drive source that is rotationally driven, and to detect the front and rear of a seat in a seat slide device for a vehicle by using the position detection device position of the seat position detection device. Background technique [0002] In recent years, for example, in a so-called power seat in which a vehicle seat is driven by a motor, it is necessary to detect the position of a movable member of the seat in order to perform motor drive control. According to Patent Document 1 as such a device, the output voltage is monitored at the output terminal of a reed switch provided between the resistors in a series circuit composed of a plurality of resistors, a series of reed switches are fixed to the upper rail, and the A magnetic body with the same magnetic pole width as the reed switch is fixed to th...

AI Technical Summary

Problems solved by technology

Therefore, accumulation of reading errors and mechanical accumulation of errors occurs every time the number of revolutions is repeated, and the accuracy for driving control deteriorates.

Also, when the battery is removed or the current position is erased, there is a problem of time to reset again

[0010] In addition, in Patent Document 3, the premise is that the origin is stored in the computer while the seat is moved to the base point position. If the seat position is moved while the computer is not operating, there is a problem that re-correction is required.

Also, when applying this technology to a power sliding seat, since the slide lock hole is not used, it is necessary to provide a dedicated detection target hole, which has the problem of increasing the manufacturing cost

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