SIR deployment method with rough road immunity
AssigneeDelco Electronics Corporation
InventorRobert J. Cashler
Life of this patent
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Abstract
A supplemental inflatable restraint system has a deployment algorithm which is enabled when a threshold acceleration is reached and then, based on subsequent measured acceleration data, determines whether and when to deploy an air bag. Rough road conditions produce accelerations which can enable the algorithm and then produce a reset event to terminate the algorithm. Reset events are each stored for a short time and the number of unexpired reset events is a measure of the rough road condition. The deployment calculation is adjusted to delay deployment for a time proportional to the number of reset events to allow gathering of additional acceleration data for the deployment decision.
Claims10
A control method for deployment of a supplemental inflatable restraint in a motor vehicle comprising the steps of:
- measuring vehicle acceleration;
- initiating deployment calculation based on the measured acceleration when the measured acceleration exceeds a predetermined acceleration;
- deploying the supplemental inflatable restraint when the deployment calculation indicates an occurrence of a crash event;
- detecting a reset event indicative of a rough road condition;
- terminating the deployment calculation when a reset event is detected prior to deploying the supplemental inflatable restraint;
- storing a history of the detected reset events for a finite time;
- and
- upon subsequent initiation of the deployment calculation, modifying such calculation in accordance with the history of detected reset events so as to prevent false deployment due to the rough road condition.
Dependencies are inferred from the claim text.