Back to results
US 4,985,835 AGranted
Method and apparatus for activating a motor vehicle safety system
AssigneeAudi AG
InventorsGeorg Sterler, Heinz Bader
Life of this patent
Estimating the term…
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.
Claims7
A method for activating a motor vehicle safety system comprising:
- measuring the deceleration of said vehicle and producing an acceleration signal indicating the magnitude of said vehicle deceleration;
- calculating from said acceleration signal the projected position of a passenger of said vehicle due to said deceleration in accordance with the following formula:
- ##EQU2## where:
- t.sub.x =time x
- z=activation time of the safety device
- a (t)=acceleration sensor signal at time t
- v.sub.rel =relative velocity, calculated by integration of a (t)
- S.sub.I (t)=projected position of passengers at time t (calculated by doubled integration of the acceleration sensor signal.)
- K.sub.1 -K.sub.4 =evaluation factors;
- and
- activating said safety system if said calculated projected position of said passenger exceeds a predetermined threshold value.
8 more elements
Dependencies are inferred from the claim text.