Method of storing accident data for a vehicle
Provided is a method of storing accident data for a vehicle, in which image data taken by a camera during driving is stored in real time, a weight value is set according to a measured impulse value to calculate a priority index and data is stored in a memory based on the priority index, thereby preventing initial accident-cause data from being deleted over time. The method includes acquiring driving data including image data, setting a weight value corresponding to an average impulse value and calculating a priority index, selecting a block having a lowest priority index and storing the driving data in the selected block if the capacity of the volatile memory is full, determining whether a timer starts, and reading out all data stored in the volatile memory and storing the read data in the non-volatile memory if the predetermined amount of time has elapsed.
1. A method of storing accident data for a vehicle implemented in an apparatus for storing accident data for a vehicle, the apparatus including a camera unit, a frame grabber, an accident detecting sensor, a volatile memory, a non-volatile memory, and a controller, the method comprising:
acquiring, by the controller, driving data including image data every pre-determined interval;
setting a weight value corresponding to an average impulse value included in the acquired driving data, and calculating a priority index;
sequentially storing the driving data if a capacity of the volatile memory is not full, and selecting a block having a lowest priority index from the volatile memory and storing the driving data in the selected block if the capacity of the volatile memory is full;
determining, by the controller, whether a timer starts, checking if an impulse value acquired in real time is greater than a predetermined threshold if the timer does not start, and starting the timer if the impulse value is greater than the pre-determined threshold;
if the timer starts, determining whether a predetermined amount of time has elapsed from a point-in-time at which the timer starts; and
reading out all data stored in the volatile memory and storing the read data in the non-volatile memory as accident-related data if the predetermined amount of time has elapsed from the point-in-time at which the timer starts.
2. The method of claim 1 , wherein the average impulse value is an average of impulse values acquired in a data interval stored in a single memory block with respect to at least one 1 axis.
3. The method of claim 1 , wherein the priority index is calculated by multiplying the average impulse value by the weight value being set corresponding to the average impulse value.
4. The method of claim 1 , wherein the selecting of the block having the lowest priority index and the storing of the driving data in the selected block comprises:
setting a memory block which stores data recorded before a specific amount of time from a current point-in-time and a memory block which stores data recorded after a point-in-time at which the accident occurs as a memory overwrite region, thereby allowing a specific amount of data recorded before and after the point-in-time at which the accident occurs to be safely held regardless of the priority index.