| 摘要 |
The severity of a crash is discriminated from a measure of relative motion of first (16) and second (18) elements of a vehicle (12), wherein an initial time (t0) is recorded when a variable point (56) in the associated phase space (54) of relative velocity (44.2) and relative displacement (46.2) crosses a first threshold boundary (60), and a safety restraint actuator (36) is actuated if a subsequent time (t) when the variable point (56) crosses a second threshold boundary (62) is within threshold period following the initial time (t0). In accordance with another aspect, a type of impacting object is discriminated from a first measure of relative motion at a first location (20.1), and a crash severity is discriminated from a second measure of relative motion at a second location (20.2), wherein the relative motion at the first location (20.1) is unipolar for one type of crash and bipolar for another, and the relative motion at the second location (20.2) is unipolar for both types of crashes. The second threshold boundary (62) can be responsive to discrimination of the type of impacting object by the first relative motion sensor (14.1).
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