SIR deployment method based on occupant displacement and crash severity
First Claim
1. A control method for deployment of a supplemental inflatable restraint (SIR) in a motor vehicle based on a measured vehicle acceleration to arrest occupant displacement, the method comprising the steps of:
- in response to an initiation of a vehicle crash event, repeatedly integrating the measured vehicle acceleration to form signals corresponding to initial vehicle velocity and initial vehicle displacement, filtering the measured vehicle acceleration to form a signal corresponding to an average vehicle acceleration, and estimating a future occupant displacement due to the crash event in accordance with the initial displacement signal, the initial velocity signal, the average vehicle acceleration signal and a time interval nominally required to deploy said SIR;
comparing said estimate of future occupant displacement to a threshold displacement corresponding to a maximum desired occupant displacement at the time of SIR deployment;
estimating severity of the crash event once said estimate of future occupant displacement exceeds said threshold displacement; and
deploying the SIR when the estimated severity of the crash event exceeds a predetermined severity threshold.
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Accused Products
Abstract
A two-step deployment control method for a supplemental inflatable restraint (SIR) in a vehicle. The deployment decision includes a "time to wait" step in which the control determines "when to deploy", and a "severity" step in which the control determines "whether to deploy". The "time to wait" step is based on an estimation of occupant displacement due to the crash, and the "severity" step is based on an estimation of the crash severity. The control method is modified to initiate earlier deployment when the acceleration data is indicative of a localized impact which does not involve the full front structure of the vehicle, such as an angle or pole impact.
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Citations
10 Claims
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1. A control method for deployment of a supplemental inflatable restraint (SIR) in a motor vehicle based on a measured vehicle acceleration to arrest occupant displacement, the method comprising the steps of:
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in response to an initiation of a vehicle crash event, repeatedly integrating the measured vehicle acceleration to form signals corresponding to initial vehicle velocity and initial vehicle displacement, filtering the measured vehicle acceleration to form a signal corresponding to an average vehicle acceleration, and estimating a future occupant displacement due to the crash event in accordance with the initial displacement signal, the initial velocity signal, the average vehicle acceleration signal and a time interval nominally required to deploy said SIR; comparing said estimate of future occupant displacement to a threshold displacement corresponding to a maximum desired occupant displacement at the time of SIR deployment; estimating severity of the crash event once said estimate of future occupant displacement exceeds said threshold displacement; and deploying the SIR when the estimated severity of the crash event exceeds a predetermined severity threshold. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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Specification