Changes

==Accelerometer Calibration==

==Accelerometer Calibration==

There are two conditions when auto calibration takes place:

 

 

 

 

There are two conditions when auto calibration takes place:<br />

*If on device startup no calibration was detected;

*If on device startup no calibration was detected;

*If the device receives an SMS/GPRS message with ''auto_calibrate:set'' text.<br />

*If the device receives an SMS/GPRS message with ''auto_calibrate:set'' text.<br />

After functionality has started FMB device periodically checks current appliance GNSS,

After functionality has started FMB device periodically checks current appliance GNSS, ignition and movement source parameters and if the conditions match:

ignition and movement source parameters and if the conditions match:<br />

*position fix got;

*position fix got;

*first calibration vector was not saved yet;<br />

*first calibration vector was not saved yet;<br />

Then first vector is taken. Saved vector will be considered as ground vector and it will be

Then first vector is taken. Saved vector will be considered as ground vector and it will be used at further calibration calculations.

used at further calibration calculations.<br />

 

''Note: When FMB device saves first ground vector vehicle must be parked on flat ground''.

''Note: When FMB device saves first ground vector vehicle must be parked on flat ground''. Crooked vector may have an impact on further calculations.

Crooked vector may have an impact on further calculations.<br />

 

Afterwards first ground vector was taken, device analyses conditions:<br />

Afterwards first ground vector was taken, device analyses conditions:

*position fix got;

*position fix got;

*vehicle speed increase by 7km/h within 1 second.<br />

*vehicle speed increase by 7km/h within 1 second.<br />

For next vector. Second vector will be taken if all conditions match. Immediately after

For next vector. Second vector will be taken if all conditions match. Immediately after second vector is received, it will be multiplied by first (ground) vector, the result of these vectors is vector multiplication cross product which is the right side of a car. By using same vector multiplication method, device front, left side will be calculated. At this point calibration is successfully ended as indication device sends an SMS/GPRS message with ''Device is calibrated, to recalibrate send:auto_calibrate:set''.

second vector is received, it will be multiplied by first (ground) vector, the result of these

 

vectors is vector multiplication cross product which is the right side of a car. By using

''Note: SMS/GPRS message will be sent only if auto calibration functionality was triggered by'' SMS/GPRS message''.''

same vector multiplication method, device front, left side will be calculated. At this point

 

calibration is successfully ended as indication device sends an SMS/GPRS message with

For user convenience in case auto calibration functionality fails then notification message will be sent. For exact messages, check algorithm section.

''Device is calibrated, to recalibrate send:auto_calibrate:set''.<br />

 

''Note: SMS/GPRS message will be sent only if auto calibration functionality was triggered by''

''Note: SMS/GPRS message will be sent only if auto calibration functionality was triggered by'' SMS/GPRS message''.''

SMS/GPRS message''.<br />''

 

For user convenience in case auto calibration functionality fails then notification message

To get current calibration status ''auto_calibrate:get'' SMS/GPRS command must be sent to the device. If device is calibrated it will respond with ''Calibration state: calibrated'' or otherwise ''Calibration state: not calibrated''. Also this command returns saved Ground and Side vectors.

will be sent. For exact messages, check algorithm section.<br />

 

''Note: SMS/GPRS message will be sent only if auto calibration functionality was triggered by''

After every TRIP START event, device starts shadow calibration. This type of calibration is running in parallel with already saved vectors (this means that vectors does not reset until shadow calibration have both new vectors). After shadow calibration is done, device updates the vector values to the new ones. There are two conditions when shadow calibration does not run at TRIP start event:

SMS/GPRS message''.<br />''

To get current calibration status ''auto_calibrate:get'' SMS/GPRS command must be sent to

the device. If device is calibrated it will respond with ''Calibration state: calibrated'' or otherwise

''Calibration state: not calibrated''. Also this command returns saved Ground and Side vectors.<br />

After every TRIP START event, device starts shadow calibration. This type of calibration is

running in parallel with already saved vectors (this means that vectors does not reset until

shadow calibration have both new vectors). After shadow calibration is done, device updates the

vector values to the new ones. There are two conditions when shadow calibration does not run

at TRIP start event:<br />

*Normal calibration is still running.

*Normal calibration is still running.

*Shadow calibration is still running from previous TRIP event.<br />

*Shadow calibration is still running from previous TRIP event.<br />

To take ground vector these conditions should be met:<br />

To take ground vector these conditions should be met:

*Ignition is ON

*Ignition is ON

*Vehicle speed = 0km/h<br />

*Vehicle speed = 0km/h<br />

Device will check these conditions every 1sec until they will pass.<br />

Device will check these conditions every 1sec until they will pass.

To take side vector these conditions should be met:<br />

 

To take side vector these conditions should be met:

*Vehicle speed >= 20km/h

*Vehicle speed >= 20km/h

*Ignition is ON

*Ignition is ON

*Device angle does not change more than 5 degrees in past 1 sec

*Device angle does not change more than 5 degrees in past 1 sec

*Speed need to increase by 7km/h in 1s period.<br />

*Speed need to increase by 7km/h in 1s period.<br />Device will check these conditions every 1 sec until they will pass.

 

Device will check these conditions every 1 sec until they will pass.<br />

 

 

 

 

 

 

 

 

 

 

 

After calibration if quality value is less than 0.80, calibration update functionality is run. Calibration update constantly tries calibrating device in background until 0.80 quality is reached. Calibration update functionality does not change calibration if calculated new calibration quality is less than 0.80.

==Excessive Idling==

==Excessive Idling==