 |
 |
 |
 |
|
 |
 |
SAE J2735-Draft-Rev26 [issued: 09-18-08]
-
130 -
This is an SAE Motor Vehicle Council draft document of the DSRC committee, subject to change.
MSG
DF
DF_Height:frame
In addition, this item may be used by data structures in other ITS standards.
Remarks: The value of zero SHALL be used when an unknown elevation must be sent. The Elevation
shall be taken from the spatial center of the vehicle, when a vehicle is being measured.
Edit note: Sue and co proposed to change the upper trigger point to be 61440 (a 2^12 rounding point) to
allow more depth, pending change, August 11th
7.54 Data Element: DE_EventFlags
Use: The DE_EventFlags data element is used to denote when various events have been detected in the
sending vehicle. The presence of this value (i.e. the presence and any bits sets to ones) indicates that some
unusual event has either been detected or predicted in the sending vehicles. Other vehicles receiving this
information may wish to process the message in which it is found in differing ways to detect potential
safety or hazard issues. When an event flag is present in a message, other optional data elements may also
be present. Consult the each specific application for further details and rules.
Further normative definitions of when the assert each event are given below.
Handbrake Active: Any auxiliary braking system is active for more than 400mSec.
Hood Open: The engine compartment hood is not closed (may indicate breakdown event).
Air Bag Deployment: At least one airbag has been deployed .
Hazard Lights: The hazard lights are active.
Stop Line Violation: The vehicle anticipates it will pass the line with coming to a full stop before
reaching it.
Hazardous Materials The vehicle known to be carrying hazardous material and is placarded as such.
Emergency Response: The vehicle is a properly authorized public safety vehicle type and is engaged in
a service call at this time where accelerated driving is present (lights and sirens may not be evident).
Hard Breaking: The vehicle has (or is) decelerated at a rate of greater then 0.3g for a period exceeding
250 mSec.
Other Breaking: The vehicle has decelerated with an active breaking system. One or more of the
following are active: brake boost, traction control, or ant-lock braking.
Lights Changed: The status of the external lighting of the vehicle has changed recently (the new state of
the lights is presented in another element).
Wipers Changed: The status of wipers (font or rear) of the vehicle has changed recently (the new state
of the wipers is presented in another element).
Control Loss: A loss of control in the vehicle traction system exceeding 400 mSec in length.
ASN.1 Representation:
EventFlags ::= BIT STRING {
eventHandbrakeActive (1),
eventHoodOpen (2),
eventAirBagDeployment (3),
eventHazardLights (4),
eventStopLineViolation (5),
eventHazardousMaterials (6),
eventEmergencyResponse (7),
 |