Qualifying automatic vehicle crash emergency calls to public safety answering points
The present application provides methods for in-vehicle emergency telematics devices and systems to automatically qualify vehicle crash events before directly placing a 3-digit emergency call from an in-vehicle TCU to a local PSAP operator. The qualification is performed in two stages. The first stage produces a qualified crash detection decision wherein a preliminary crash detection based on impact sensors is qualified by crash related non-impact sensors and vehicle telemetry data. The second stage uses an injury severity prediction algorithm to score the detected crash and produces a decision as to whether the crash warrants an emergency call to the PSAP operator.
1. A method comprising:
receiving accelerometer data indicating a change in a motor vehicle velocity;
processing the accelerometer data to determine acceleration amplitude versus time date;
determining a preliminary crash detection decision indicating that the motor vehicle may have experienced a crash when the acceleration amplitude is greater than a predetermined accelerometer threshold;
determining a time associated with the preliminary crash detection decision;
receiving velocity data of the motor vehicle;
processing the velocity data to determining amplitude of change in velocity versus time data at time data associated with the preliminary crash decision; and
determining the motor vehicle has experienced a crash if the amplitude of change in velocity data is above at least one of a predefined velocity threshold or a percentage change velocity threshold when the value of the acceleration amplitude data was determined to be greater than the predefined accelerometer threshold.
2. The method of claim 1 , further comprising:
generating accelerometer crash pulse data determined as the amplitude of the acceleration data versus time data when the acceleration amplitude is greater than the predetermined accelerometer threshold;
comparing the velocity data versus time data to the crash pulse data; and
determining whether the motor vehicle has experienced a crash based on results of the comparison.
3. The method of claim 1 , wherein the velocity of the motor vehicle was obtained from at least one of the speedometer or via global position system (GPS) measurements.
4. The method of claim 1 , wherein the determining the motor vehicle has been in a crash is performed via an on-board diagnostic II (OBD-II) device.
5. An apparatus comprising:
a receiver configured to receive accelerometer data indicating a change in a motor vehicle velocity;
a receiver configured to receive velocity data of the motor vehicle; and
a processor configured to
process the accelerometer data to determine acceleration amplitude versus time data;
process the acceleration amplitude versus time data to determine a preliminary crash detection decision indicating that the motor vehicle may have experienced a crash at a preliminary crash time determined by the acceleration amplitude being greater than a predetermined accelerometer threshold;
process the velocity data of the motor vehicle to determine amplitude of velocity change versus time data at the preliminary crash time;
determine the motor vehicle has been in a crash based on the comparing of the acceleration amplitude versus time data and the velocity change versus time data at the preliminary crash time;
wherein the processor is configured to compare by determining whether the value of the amplitude of velocity change is above at least one of a predefined velocity threshold or a percentage change velocity threshold when the value of acceleration amplitude was determined to be greater than the predefined accelerometer threshold.
6. The apparatus of claim 5 , wherein the processor is further configured to:
generate accelerometer crash pulse data as the amplitude of the acceleration data versus time data when the acceleration amplitude is greater than the predetermined accelerometer threshold;
compare the velocity data versus time data to the crash pulse data; and
determine whether the motor vehicle has experienced a crash based on results of the comparison.
7. The apparatus of claim 5 , wherein the velocity of the motor vehicle was obtained from at least one of the speedometer or via global position system (GPS) measurements.
8. The apparatus of claim 5 , wherein the processor is configured to determine the motor vehicle has been in a crash via an on-board diagnostic II (OBD-II) device.
9. A non-transitory computer readable storage medium configured to store instructions that when executed causes a processor to perform:
receiving accelerometer data indicating a change in a motor vehicle velocity
receiving velocity data of the motor vehicle;
processing the accelerometer data to determine acceleration amplitude versus time data;
processing the acceleration amplitude versus time data to determine a preliminary crash detection decision indicating that the motor vehicle may have experienced a crash at a preliminary crash time determined by the acceleration amplitude being greater than a predetermined accelerometer threshold;
processing the velocity data of the motor vehicle to determine amplitude of velocity change versus time data at the preliminary crash time;
determining the motor vehicle has been in a crash based on the comparing of the acceleration amplitude versus time data and the velocity change versus time data at the preliminary crash time;
wherein the processor is configured to compare by determining whether the value of the amplitude of velocity change is above at least one of a predefined velocity threshold or a percentage change velocity threshold when the value of acceleration amplitude was determined to be greater than the predefined accelerometer threshold.
10. The non-transitory computer readable storage medium of claim 9 , wherein the processor is further configured to perform:
generating accelerometer crash pulse data as the amplitude of the acceleration data versus time data when the acceleration amplitude is greater than a predetermined accelerometer threshold;
comparing the velocity data versus time data to the crash pulse data; and
determining whether the motor vehicle has experienced a crash based on results of the comparison.
11. The non-transitory computer readable storage medium of claim 9 , wherein the velocity of the motor vehicle was obtained from at least one of the speedometer or via global position system (GPS) measurements and the determining the motor vehicle has been in a crash is performed via an on-board diagnostic II (OBD-II) device.