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Seat occupancy sensor assembly

A technology of occupancy sensors and seats, applied in the direction of vehicle seats, special positions of vehicles, vehicle safety arrangements, etc.

Inactive Publication Date: 2008-09-24
IEE INT ELECTRONICS & ENG SA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The downside is that this improvement means a huge effort to develop and get approval

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  • Seat occupancy sensor assembly
  • Seat occupancy sensor assembly

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Embodiment Construction

[0022] FIG. 1 generally illustrates a seat occupancy sensor assembly 10 having a variable resistance seat occupancy sensor 12 and its adapter circuit 14 . The assembly 10 has an input terminal 16 with which it is connected to a vehicle voltage source 18 , and an output terminal 20 with which it is connected to a snap switch input 22 of a control unit 24 . By measuring the voltage drop across the terminating resistor 26 , the control unit measures the current drawn by the seat occupancy sensor assembly 10 at the input terminal 16 .

[0023] This seat occupancy sensor 12 is of the pressure-sensitive type: its resistance is greatest when the seat is empty, and decreases continuously as the pressure exerted on the seat increases. Adapter circuit 14 includes logic circuitry 28 for comparing the resistance of the seat occupancy sensor to a predetermined threshold. This logic circuit controls the current source 30 to draw a first amount of current if the resistance of the seat occup...

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Abstract

An occupancy sensor assembly with a variable-resistance seat occupancy sensor comprises an adapter circuit for connecting the occupancy sensor to a control unit. The adapter circuit includes switching means for switching, between discrete states and as a function of resistance of the seat occupancy sensor, a current drawn from the control unit by the assembly.

Description

technical field [0001] The present invention relates generally to occupant detection systems for automobiles and, more particularly, to occupancy sensor assemblies associated with vehicle seats. Background technique [0002] Seat occupancy sensors for different applications are already known in the automotive industry, for example in the field of airbag deployment systems. In order to protect the lives of occupants in traffic accidents, modern vehicles are generally equipped with protection systems, including several airbags and seat belt pretensioners, which are used to absorb the energy released by occupants when a collision occurs due to an accident. While it is recognized that the primary purpose of air bags is to protect the occupants, there are situations where air bag deployment is undesirable. For example, airbags associated with unoccupied seats should be turned off in order to reduce vehicle repair costs. [0003] Commonly used seat occupancy sensors include one ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B60R21/015B60N2/90
CPCB60R21/01532B60R21/015B60R2021/01068
Inventor M·科尔代尔
Owner IEE INT ELECTRONICS & ENG SA