Black Boxes and the future

Discussion on Advanced and Defensive Driving.

Postby Garrison » Sun Jul 19, 2015 10:31 am


akirk wrote:how does GPS measure g-force? is it accurate enough to really detect different types of cornering?

camera gimbal heads are expensive - but you could pick up a gimbal bearing for c. £60 - or pop along to a yachty boot sale on the south coast and get one for a few pounds - build your own stand...

I don't think they use the GPS to measure g-force. I think it may be use for time spend in different location, speed, etc. to determine risks.
Garrison
 
Posts: 260
Joined: Tue Sep 02, 2008 11:55 am
Location: London

Postby trashbat » Sun Jul 19, 2015 11:08 am


I haven't looked into it in detail but I expect it uses the phone's accelerometer. In practice GPS is good for linear speed and tolerable for slow acceleration, but the accelerometer would be the only way to get a measure of short term smoothness. Remember that it's about pattern matching over time, not every single anomalous value. I expect it works quite well.
Rob - IAM F1RST, Alfa Romeo 156 JTS
trashbat
 
Posts: 764
Joined: Wed Jun 22, 2011 11:11 pm
Location: Hampshire

Postby trashbat » Sun Jul 19, 2015 6:38 pm


Well, you can monitor it yourself with various free accelerometer apps. You're looking for prolonged acceleration in a single plane so in theory you can filter out a load of noise with that alone. Plus a phone in a car ought to be comparatively static.

Typical GPS polling, for power consumption reasons if nothing else, is usually multiple seconds which isn't very good. I don't know what a practically acceptable sampling rate for the accelerometer is but it's a lot better.

If we're looking for a real world pattern of say "passengers thrown forward under harsh acceleration", I'd suggest it's doable, especially if backed up with GPS. Something subtler like a good measure of gearchange smoothness, maybe not.
Rob - IAM F1RST, Alfa Romeo 156 JTS
trashbat
 
Posts: 764
Joined: Wed Jun 22, 2011 11:11 pm
Location: Hampshire

Postby trashbat » Sun Jul 19, 2015 7:28 pm


Acceleration encompasses deceleration :)
Rob - IAM F1RST, Alfa Romeo 156 JTS
trashbat
 
Posts: 764
Joined: Wed Jun 22, 2011 11:11 pm
Location: Hampshire

Postby Kimosabe » Sun Jul 19, 2015 10:35 pm


WhoseGeneration wrote:
Kimosabe wrote:
I feel it's simply a matter of time before drivers are remotely observed,


Chip implanted at birth, it's the only way forward.


Remote biometrics? I think that's what some folk refer to as 'smartphones'. Oh the irony :lol:

I see no point in dragging our heels over this 'human chip and pin' thing, because it's an inevitability....but they'll have to catch me with a tranquiliser gun first and I wont be taking prisoners. :arrow: :mrgreen:
A wise man once told me that "it depends". I sometimes agree.
Kimosabe
 
Posts: 586
Joined: Fri Mar 29, 2013 2:30 pm

Postby WhoseGeneration » Sun Jul 19, 2015 11:09 pm


Kimosabe wrote:
I see no point in dragging our heels over this 'human chip and pin' thing, because it's an inevitability....but they'll have to catch me with a tranquiliser gun first and I wont be taking prisoners. :arrow: :mrgreen:


To be a bit "political", "they" might catch you but I doubt "they" will catch members of ISIS.
See the problem?
Always a commentary, spoken or not.
Keeps one safe. One hopes.
WhoseGeneration
 
Posts: 914
Joined: Tue Dec 04, 2007 6:47 pm

Postby Kimosabe » Mon Jul 20, 2015 4:19 pm


WhoseGeneration wrote:
Kimosabe wrote:
I see no point in dragging our heels over this 'human chip and pin' thing, because it's an inevitability....but they'll have to catch me with a tranquiliser gun first and I wont be taking prisoners. :arrow: :mrgreen:


To be a bit "political", "they" might catch you but I doubt "they" will catch members of ISIS.
See the problem?


Regardless of this, i'm handing myself in now incase I do something vaguely erroneous in future. Best to get it over with. 8)
A wise man once told me that "it depends". I sometimes agree.
Kimosabe
 
Posts: 586
Joined: Fri Mar 29, 2013 2:30 pm

Postby michael769 » Fri Nov 13, 2015 10:12 am


akirk wrote:Those refer to fitted black box recorders...
does anyone know whether the car's built in computer maintains a permanent record of data - or does it only push it out in real time?

Alasdair


It's not permanent - they just don't have the memory capacity to store all data for all time. But they do have buffers which store some parameters for a period of time. How much depends on the memory and that varies from manufacturer to manufacturer.

These days many do have enough to reconstruct information about how the car is driven (for example you can identify harsh acceleration from fuel trim data), how long such data is kept varies from minutes to a few hours. Some high spec cars have track modes than include capture and storage of a lot of data (which is made available to the driver).

Aftermarket scan tools that read both OBDII and manufacturer specific data are widely available now so getting at the data is not difficult, and the police can and do extract it when investigating suspected offences where the effort to do so is warranted (eg fatalities).
Minds are like parachutes - they only function when open
Thomas Robert Dewar(1864-1930)
michael769
 
Posts: 1209
Joined: Mon Sep 17, 2007 9:11 am
Location: Livingston

Previous

Return to Advanced Driving Forum

Who is online

Users browsing this forum: No registered users and 7 guests


cron