The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Mar. 08, 1994
Filed:
Apr. 09, 1991
Jeffrey R Rochette, Livonia, MI (US);
Edward J Abeska, Ferndale, MI (US);
TRW, Inc., Lyndhurst, OH (US);
Abstract
A method and apparatus are disclosed for testing an airbag restraint system of the type having at least two parallel connected inertia sensors connected in series with a squib across a source of electrical energy, each inertia sensor having a normally open switch and an associated parallel connected resistor. Each parallel connected inertia sensor has a series connected diode for isolating its associated inertia sensor circuit from other circuit components in the firing circuit. A microcontroller monitors at least one voltage value at a component connection while at least one parallel connected inertia sensor is isolated. The microcontroller determines a value functionally related to the resistance of at least one circuit component in the firing circuit while at least one parallel connected inertia sensor is isolated. The microcontroller compares the determined value against predetermined limits. If the determined value is not within the predetermined limits, an error indication is provided.