Device for testing internal pressure of a gas reservoir of an airbag inflator
US6550335B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Apr 30, 2002 |
| Grant date | Apr 22, 2003 |
| Priority date | — |
| Expiry date | Apr 30, 2022 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01M3/24
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A device for testing the inflation state of an cold gas inflator for an airbag has a gas reservoir that is filled with gas at a high pressure, in particular an inert gas. Oscillations of frequencies varying within a particular frequency range are generated at an exterior surface the filled gas reservoir by an oscillation transmitter and the resonance frequency is measured using an oscillation sensor. A comparator compares the measured resonance frequency with a resonance frequency that was determined at the gas reservoir filled with the volume of gas. The oscillation transmitter and the oscillation sensor are integrated in a unit such that the generation and frequency measuring of the oscillations are carried out at locations on the exterior surface of the gas reservoir that are distanced from one another with respect to a longitudinal axis of the gas reservoir.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.