Rear impact detection method and system
View Patent ↗Method and system for deploying an occupant restraint device in a vehicle includes arranging a sensor to detect a rear impact and deploying the occupant restraint device when the sensor detects the rear impact of sufficient magnitude to require deployment of the occupant restraint device to prevent injury to the occupant. The sensor may be a crush sensor which preferably extends across a major portion of the rear of the vehicle, an inertial sensor and/or an anticipatory sensor.
1. A method for deploying an occupant restraint system in a vehicle, comprising:
providing an occupant restraint system in the vehicle comprising a movable headrest associated with a seat in the vehicle, wherein the headrest is positioned to be proximate to a head of an occupant sitting in the seat;
arranging a sensor in the vehicle to obtain rear impact data about an actual or expected rear impact;
providing the rear impact data to a computer system onboard the vehicle;
configuring the computer system to make a deployment determination, based on the rear impact data, when the actual or expected rear impact is or will be of sufficient magnitude to warrant deployment of the occupant restraint system; and
configuring the computer system to trigger deployment of the occupant restraint system in response to the deployment determination,
wherein the step of deploying the occupant restraint system comprises moving the headrest toward the head of the occupant.
2. The method of claim 1 , wherein the sensor is a crush sensor.
3. The method of claim 1 , wherein the sensor is an inertial sensor.
4. The method of claim 1 , wherein the sensor is an anticipatory sensor that obtains rear impact data about an expected rear impact.
5. The method of claim 1 , further comprising arranging at least one sensor in the headrest to provide information about the relative distance between the headrest and the occupant's head and thereby enable the headrest to move into contact with the occupant's head.
6. The method of claim 1 , wherein the step of moving the headrest toward the occupant comprises moving the headrest into contact with the occupant's head after the deployment determination.
7. The method of claim 1 , wherein the step of moving the headrest toward the occupant comprises moving the headrest from a first position in which it is in prior to the deployment determination to a second position in contact with the occupant's head so that it will be in the second position during the rear impact.
8. The method of claim 1 , wherein the sensor is an electronic sensor.
9. The method of claim 1 , wherein the computer system is a neural network computer system.
10. The method of claim 1 , wherein the sensor is an accelerometer.
11. The method of claim 1 , wherein the step of moving the headrest toward the occupant's head comprises moving the headrest into contact with the occupant's head.
12. The method of claim 1 , further comprising arranging the sensor to sense an impact into a rear of the vehicle.
13. The method of claim 4 , further comprising arranging the anticipatory sensor to sense an impact into a rear of the vehicle.
14. The method of claim 1 , further comprising arranging the sensor in a crush zone of the vehicle that will crush during a rear impact.
15. A method for moving a movable headrest associated with a seat in a passenger compartment of a vehicle to protect an occupant sitting in the seat during a rear impact involving the vehicle, the headrest being positionable proximate to a head of the occupant sitting in the seat, the method comprising:
arranging a sensor system in the vehicle to obtain rear impact data about an actual rear impact during its occurrence or an expected rear impact prior to its occurrence;
providing the rear impact data to a computer system;
configuring the computer system to make a deployment determination, based on the rear impact data, whether the rear impact is or will be of sufficient magnitude to require movement of the headrest to prevent injury to the occupant; and
configuring the computer system to trigger movement of the headrest toward the occupant in response to the deployment determination,
wherein the step of moving the headrest comprises moving the headrest from a first position in which it is in prior to the deployment determination by the computer system to a second position in contact with the occupant's head so that it will be in the second position during the rear impact.
16. The method of claim 15 , further comprising arranging the sensor to sense an impact into a rear of the vehicle.