Abstract: A method and apparatus for recognizing a crash, in a vehicle by measuring vehicle speed change continuously within a limited time periods and comparing the measured values with those determined in prior time periods. Acceleration can be differentiated out by means of the above-mentioned process/arrangement and can be evaluated if, in the case of a high-speed and low-speed crash, it should not be possible to differentiate sufficiently by means of the partial speed difference. Different partial speed differences (by means of observation periods of different durations) can be measured and compared in order to permit ignition in the case of slower (oblique) crashes only within a limited time window in the initial phase of the crash.

Abstract: A deceleration switch comprising a support member, a permanent magnet mounted on the support member and displaceable from a first position to a second position by inertia caused by a predetermined deceleration of the support member, a spring mounted on the support member for biasing the permanent magnet toward the first position, a set of electrical contacts mounted on the support member and operable to close under the influence of the magnetic field of the permanent magnet when the permanent magnet is in the second position and an inductive device energized to produce a second magnetic field enhancing the magnetic field of the permanent magnet thus causing the contacts to remain closed for a longer period of time upon return of the permanent magnet to its first position under the biasing action of the spring.

Abstract: An improved method for determining when an automotive safety system should be released. The improved method calculates and predicts the movement of dislocation of the driver from the seated position at a predetermined time in the future based upon signals provided from one or more acceleration sensors.

Abstract: A method for testing an airbag release circuit for proper operation using a single test pulse. A single test pulse of predetermined form is delivered to the circuit in place of an accelerometer signal. The form of the test pulse permits determination of an expected resultant circuit output signal. The actual circuit output signal is compared to the expected signal to confirm or deny proper operation of the circuit. The test pulse can be modified to different forms to test individual aspects of the circuit.

Abstract: An electric or electronic module provides an error indication through a display unit. The display unit indicates power failure to the module in addition to an error indication. Power failure to the display unit results in power failure to an operationally essential component of the apparatus in which the module is installed, thereby providing a secondary power-fail indicator.