Device and method for detecting seat occupancy
First Claim
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1. A device for detecting seat occupancy, comprising:
- a plurality of first and second sensor elements assigned to a surface of a seat;
said sensor elements outputting first and second sensor signals, respectively, in dependence on a force of a weight acting on a respective said sensor element; and
a selection circuit connected to receive the sensor signals and effecting an ambient-temperature-dependent selection between the first and the second sensor signals for detecting the seat occupancy.
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Abstract
A device and a method for detecting seat occupancy, with the device including first and second sensor elements associated with a respective seat surface. First and second weight-dependent sensor signals are electrically obtainable from the sensor elements. The seat occupancy is determined by taking either the first or the second sensor signals in dependence on an ambient temperature.
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Citations
14 Claims
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1. A device for detecting seat occupancy, comprising:
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a plurality of first and second sensor elements assigned to a surface of a seat; said sensor elements outputting first and second sensor signals, respectively, in dependence on a force of a weight acting on a respective said sensor element; and a selection circuit connected to receive the sensor signals and effecting an ambient-temperature-dependent selection between the first and the second sensor signals for detecting the seat occupancy. - View Dependent Claims (2, 3, 4)
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5. A method of detecting seat occupancy, the method which comprises:
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providing first and second sensor elements and assigning said sensor elements to a surface of a seat; tapping off electrical sensor signals from the sensor elements, the sensor signals having a value dependent on a weight acting on the respective sensor element; and determining, with a hardware analysis unit, the seat occupancy based on the first sensor signals or on the basis of the second sensor signals in dependence on an ambient temperature. - View Dependent Claims (6, 7, 8, 9, 10)
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11. An occupant-related method in a motor vehicle, the method which comprises:
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providing first and second sensor elements and assigning the sensor elements to a surface of a seat, tapping off electrical sensor signals from the sensor elements, the sensor signals having a value dependent on a weight acting on the respective sensor element; determining, with a hardware analysis unit, a seat occupancy based on the first sensor signals or on the basis of the second sensor signals in dependence on an ambient temperature with a plurality of ambient temperature ranges; and detecting, with the analysis unit, the seat occupancy in the ambient temperature range having a comparatively lowest ambient temperature based on the first sensor signals; forming a first weight value from at least one first sensor signal and comparing the first weight value with a first threshold value; and activating a first occupant protection function if the first weight value exceeds the first threshold value; detecting the seat occupancy in the ambient temperature range having a comparatively highest ambient temperature based on the second sensor signals; forming a second weight value from at least one second sensor signal and comparing the second weight value with a second threshold value; and activating a second occupant protection function if the second weight value exceeds the second threshold value. - View Dependent Claims (12, 13, 14)
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Specification