Zoombak A-GPS Universal Locator Guía de usuario descargar pdf (Pagina 14)

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G-6 Summary of fault analysis

There were issues that arose during testing that have need of fixing; these issues

pertaining to the locking mechanism, the accelerometer, and the power system. There is a safety

concern with the locking mechanism that is partly taken care of by the removable cable. When

the system battery dies the DLA is not able to function to unlock the cable from the lock

housing, this presents the issue of the cable getting tangled in either the spokes, or the chain on

the bicycle while riding. Because of this issue it would be suggested that a second key cylinder

be incorporated into the locking mechanism to make the cable removable even during instances

of power failure and would make the system safer, as well as making it usable as a physical

deterrent should the user not have charged the CABL.

The accelerometer has complications with detecting movement if the circuit is not set

level. This issue is fixed by securing the accelerometer level at a specific angle but due to the

different angles of bicycle frames the CABL may not be overly-sensitive. To fix this issue

multiple accelerometers may be used but this increases power requirements and takes up much

needed space.

The last known issue is that of the power system. When the system is active the voltage

regulators begin heating up. The voltage regulators must down step the voltage to 5 volts by

dissipating the extra power as heat. This heat continues to build up until the regulators over heat

and stop functioning. This is a major issue because if the regulators stop functioning the control

circuit shuts down and the system will no longer work. There are a few ways of dealing with this

issue; the first and simplest of which is to add in a second battery. This battery would have to

power the control circuit and the accelerometer all the time and would probably die rather

quickly. The second option would be to add in a source of cooling such as a larger heat sink, a

liquid cooling system or possibly even a fan which would require more power and a lot of space.

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Zoombak A-GPS Universal Locator Guía de usuario Pagina 14