Acceleration sensor comprising at least one micromechanical sensor element for the occupant protection system in a vehicle

摘要

In the present invention, an acceleration sensor (1 having a redundantly two micromechanical sensor element provided (2,3), each one of the A / D converter and a redundant signal paths with the (4,5) In), for validation of the output signal of the acceleration sensor (1) (14, 15), at least one of said means for monitoring a parameter related to the function of the A / D converter (4,5) ( 8, 9, 10) is provided. Said monitoring means (8, 9, 10), the one sensor element (2, 3) and is made redundant Sara A / D converter (9) for the evaluation equivalent circuit (8 which is integrated into the unit comprises a), the equivalent circuit for the change in a parameter related functions, and is intended to react in the same direction as at least one of said A / D converter (4, 5), the further A / D converter ( 9), which converts the fixed output signal of which is dependent on the acceleration of the equivalent circuit, the value of the digital output signal of the further A / D converter (9) relates to the functions of all of the A / D converter To determine the change in the parameters, using a comparator (13) and compared to a predetermined fixed limit value (12).