Sensor system for detecting the adjustment position of a vehicle seat

Abstract

The invention relates to a sensor system for detecting an adjustment position of a vehicle seat, through which the relative movement of an upper rail, at least a part of which is ferrite, in at least two adjustment positions, namely a front adjustment position and a rear adjustment position, can be detected, and the upper rail can vertically moves along a longitudinal extending portion of a static lower rail of which at least a part is ferrite. The sensor system has a Hall sensor and a first preloaded magnet, and is free of flux concentrators and shielding sheets. The Hall sensor and the first preloaded magnet are arranged along a longitudinal extending portion of the upper rail that is movable lengthwise such that during adjustment of the upper rail relative to the static lower rail, passage of a free longitudinal end of the lower rail can be monitored and an output signal of the Hall sensor is changed according to the change of the vehicle seat from the front adjustment position to the rear adjustment position, and vice versa. The sensor system is configured to generate the output signal corresponding to the rear adjustment position at the Hall sensor in an uninstalled state.

Description

technical field [0001] The invention relates to a sensor device for detecting the displacement position of a motor vehicle seat, by means of which sensor device it is possible to detect an at least partly ferritic upper rail in at least two displacement positions, namely a front displacement position and a rear displacement position. Relative movement in a partially displaced position, the upper rail being movable longitudinally along the longitudinal extension of the at least partially ferritic stationary lower rail. Background technique [0002] Motor vehicles, in particular passenger motor vehicles, are equipped with safety devices, such as front, side, knee and head airbags, at increasing masses. These safety devices are intended to protect passengers in the event of a collision and reduce the risk of injury. The air bag must deploy and inflate in a very short period of time. For this purpose, a drive loading device is used which can fill the air bag explosively and wh...

AI Technical Summary

Problems solved by technology

However, the relatively far sideways protruding lookup panel can cause a variety of obstructions, for example when objects are guided down the side of a vehicle seat

Here, there is the danger that the interrogation plate bends, which could impede the adjustment of the seat, or could prevent the correct detection of the seat position because, for example, the signal change is no longer sufficiently large.

[0008] A further problem with the sensor devices of the prior art is that they may not have a well-defined state in the event of incorrect installation and in the event of the sensor device falling from the rail system, which in the emergency case of a collision Additional risk for occupants on the vehicle seat, since the airbag inflates with an energy too small for the seat position occupied and the occupant's stature

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