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Separation of Deployment Integrated Circuits for Improved Airbag Robustness

IP.com Disclosure Number: IPCOM000004778D
Publication Date: 2001-May-17
Document File: 1 page(s) / 8K

Publishing Venue

The IP.com Prior Art Database

Abstract

In traditional airbag system electronic control units, a single deployment ASIC (Application Specific Integrated Circuit) includes two transistors that control the deployment of an airbag or pretensioner. The high side transistor allows voltage to be applied to the feed circuit to the airbag. The low side transistor allows ground to be applied to the return circuit from the airbag. The traditional design has a disadvantage. It is theoretically possible to have a single failure of the integrated circuit which could result in the inadvertent deployment of the airbag.

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Separation of Deployment Integrated Circuits for Improved Airbag Robustness

In traditional airbag system electronic control units, a single deployment ASIC (Application Specific Integrated Circuit) includes two transistors that control the deployment of an airbag or pretensioner. The high side transistor allows voltage to be applied to the feed circuit to the airbag. The low side transistor allows ground to be applied to the return circuit from the airbag. The traditional design has a disadvantage. It is theoretically possible to have a single failure of the integrated circuit which could result in the inadvertent deployment of the airbag.

It is now possible to eliminate the theoretical single point failure of the single deployment ASIC by separating the high side transistor and the low side transistor onto two independent deployment ASICs. By separating the transistors, the system is more robust against any single silicon failure. Separating the high and the low side transistors requires coordination of the two deployment ASICs by the microprocessor for system diagnostics and airbag deployment.

The new method is applicable to airbags as shown in the figures, as well as all other deployable safety actuators such as seatbelt pretensioners, side airbags, rollover curtains, and multi-stage systems.

Disclosed Anonymously