Airbag system collision history recording method
First Claim
1. An airbag system collision history recording method comprising the steps of:
- turning on an airbag ignition circuit based on acceleration data on acceleration that a vehicle undergoes when the vehicle is involved in a collision, the acceleration being detected by an acceleration sensor, so as to inflate an airbag;
writing the acceleration data in a readable memory;
determining a time when said airbag is inflated;
reading either acceleration data on acceleration that the vehicle undergoes during a predetermined time period before or after said determined time or acceleration data on acceleration that the vehicle undergoes during two predetermined time periods before and after said determined time from said readable memory; and
storing the acceleration data read from said readable memory in a nonvolatile memory as a collision history.
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Accused Products
Abstract
Acceleration data on acceleration that a vehicle undergoes are written in a readable memory, the acceleration being detected by an acceleration sensor. When an airbag is inflated, the time of the inflation is determined. Either acceleration data on acceleration that the vehicle undergoes during a predetermined time period before or after the determined time or acceleration data on acceleration that the vehicle undergoes during two predetermined time periods before and after the determined time are read from the readable memory, and the acceleration data read from the memory are stored in a nonvolatile memory as a collision history.
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Citations
6 Claims
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1. An airbag system collision history recording method comprising the steps of:
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turning on an airbag ignition circuit based on acceleration data on acceleration that a vehicle undergoes when the vehicle is involved in a collision, the acceleration being detected by an acceleration sensor, so as to inflate an airbag;
writing the acceleration data in a readable memory;
determining a time when said airbag is inflated;
reading either acceleration data on acceleration that the vehicle undergoes during a predetermined time period before or after said determined time or acceleration data on acceleration that the vehicle undergoes during two predetermined time periods before and after said determined time from said readable memory; and
storing the acceleration data read from said readable memory in a nonvolatile memory as a collision history. - View Dependent Claims (2, 3, 4, 5, 6)
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Specification