Method for monitoring pressure in device for pneumatically adjusting seat in transportation means

Abstract

The invention relates to a method for monitoring the pressure in a device for pneumatically adjusting a seat in a transportation means, in particular a motor vehicle. The device comprises a pluralityof cushions (101, 102,..., 105) which can be filled with air and which are connected to a common preliminary pressure volume (3) via respective valves (201, 201,..., 203). A pressure sensor (4) is provided for measuring the pressure (p) in the preliminary pressure volume (3), and the preliminary pressure volume (3) is coupled to a compressor (6) for supplying compressed air without the interposition of a non-return valve. In order to monitor the pressure in each cushion (101, 102,..., 105), a specified pressure is set in the preliminary pressure volume when the valve (201, 201,..., 203) is closed between the respective cushion (101, 102,..., 105) and the preliminary pressure volume (3) by operating the compressor (6) and / or by means of air exiting the preliminary pressure volume (3) via atleast one leak. The specified pressure deviates from a target pressure (p1, p2,..., p5) in the respective cushion (101, 102,..., 105) by maximally 10% of the target pressure and / or maximally 50 hPa.After adjusting the specified pressure, the valve (101, 102,..., 105) between the respective cushion (101, 102,..., 105) and the preliminary pressure volume (3) is opened, and the pressure in the preliminary pressure volume (3) is measured by the pressure sensor (4). If the measured pressure (p) deviates from the target pressure (p1, p2,..., p5), the measured pressure (p) is set to the target pressure (p1, p2,..., p5) by operating the compressor (6) and / or by means of air exiting the preliminary pressure volume (3) via the at least one leak.

Description

technical field [0001] The invention relates to a method for monitoring the pressure in a device for pneumatically adjusting a seat in a vehicle. Background technique [0002] In vehicles such as, for example, motor vehicles or also rail vehicles or aircraft, devices for pneumatic seat adjustment are increasingly being used. In such devices, padded elastic pads are used to contour the seat or for massage purposes. These devices allow the seat to be individually adapted to the occupant. [0003] Devices for pneumatic seat adjustment are usually equipped with pressure measuring devices in order to measure, store and (if necessary) re-establish the prevailing air pressure in each pad. The measurement of the pressure and the corresponding readjustment allow compensation of pressure changes due to fluctuations in the ambient pressure or ambient temperature but also due to leaks. [0004] Conventionally, in devices for pneumatic seat adjustment, the pressure of the respective p...

AI Technical Summary

Problems solved by technology

[0005] However, the use of a check valve between the compressor and the preliminary pressure chamber has disadvantages

In particular, the non-return valve introduces a not insignificant pressure loss during the filling of the pad and thus leads to a prolongation of the filling time of the pad

Moreover, the use of check valves creates additional costs

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