W3C home > Mailing lists > Public > public-autowebplatform@w3.org > May 2014

First Draft Spec - Dead Reckoning Interface

From: ALDRIC LOYER <aldric.loyer@mpsa.com>
Date: Fri, 9 May 2014 15:47:41 +0000
To: "public-autowebplatform@w3.org" <public-autowebplatform@w3.org>
CC: '박종선(Justin Park)' <jongseon.park@lge.com>, "'Rees, Kevron'" <kevron.m.rees@intel.com>, "'Paul Boyes'" <pb@opencar.com>
Message-ID: <E3FD066E27BA1440ABAA8B628C618C5A31EC6AD8@YLAV2410.INETPSA.com>
Hi All,
I think we should review the "DeadReckoning interface" for the following reasons :
1/ The Steering wheel angle is actually not used in algorithms for Dead reckoning processing. 
2/ WheelTickSensor attribute should distinguish rear left wheel and rear right wheel. If there is only one attribute for both, I don't understand how can it work.
3/ Additionally, dead reckoning algorithms also uses the reverse gear shift indication, but we already have the TransmissionMode interface for that.
4/ Finally, some suppliers use a cape to compute the Dead reckoning (provided by an accelerometer) instead of the wheel ticks, and we don't know if in the future other strategies will appear.

My overall position concerning this interface is that "dead reckoning" is an application software component and then we shouldn't predefine what data are needed for this kind of function.
The Vehicle Data API specification should only give access to a set of data that one can use to compute its own Dead Reckoning function.

In conclusion my proposal is the following :
- Remove the DeadReckoning Interface.
- Add a WheelTickSensor interface for each wheel. Furthermore, this information can be useful for many other use cases (detect a slippery road, estimate a low tire pressure,  ...)
- Add a SteeringWheelAngle Interface. Indeed, even if not needed for Dead Reckoning,  Steering wheel angle can be useful for many other use cases and then we really need a specific API for that.

I propose to address also that point on Tuesday.
For the rest every thing is okay for me.

Thank you very much to all contributors. 

Aldric LOYER
PSA Peugeot Citroën
Responsable de l'UEI COTI
(Connectivity, Telematic and Infotainment)
Direction de la Recherche et de l'Ingénierie Avancée
Tel : +33 (0) 1 57 59 81 35 (20 81 35)
Portable : +33 6 32 34 55 59
Received on Friday, 9 May 2014 15:48:19 UTC

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