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SAE J2735-Draft-Rev29 [issued: 12-11-08]
-
266 -
This is an SAE Motor Vehicle Council draft document of the DSRC committee, subject to change.
Start
Initialize Variables
Probe Data
Event
Occurred
?
Record Event
Snapshots
(
Message Writing
Procedure
)
Y
stopflag
=
1
?
v
>
vstart
?
Y
Record Start
Snapshots
(
Message Writing
Procedure
)
Stopflag
=
0
Y
V
=
0
?
If tv
0
_
last
=
0
then tv
0
_
last
=
t
ELSE
(
tv
0
=
tv
0
+
(
t
-
tv
0
_
last
)
AND tv
0
_
last
=
t
)
tv
0
>
Tstopdelay
?
Record Stop
Snapshots
(
Message Writing
Procedure
)
Tstopmsg
=
t
Stopflag
=
1
Probe
Management
Active
?
Y
Y
(
t
-
tp
)
>
Tp
(
v
)
?
AND Stopflag
=
0
((
t
-
tp
)
>
tpma
(
v
)
?
OR
(
d
-
dp
)
>
dpma
(
v
)
?
)
AND Stopflag =
0
Record Periodic
Snapshot
(
Message Writing
Procedure
)
tp
=
t
dp
=
d
Record Periodic
Snapshot
(
Message Writing
Procedure
)
tp
=
t
dp
=
d
Y
Y
Y
Definition of Variables
:
v
=
current velocity
t
=
current time
d
=
current distance
dp
=
distance at last periodic message recording
stopflag
=
bit indicating whether vehicle stopped
(
1
=
stopped
)
tp
=
time of last periodic message recording
tv
0
=
amount of time
,
in seconds
,
vehicle speed has been
0
mph
?
tv
0
_
last
=
time in ms since the last V
=
0
evaluation
Stopflag
=
0
AND
t
-
tstopmsg
>
Tstop
tv
0
=
0
tv
0
_
last
=
0
N
N
N
N
N
N
N
N
N
Y
Definition of Parameters
:
Dpma
(
v
) =
vector of distances for periodic message recording from
probe management
Tp
(
v
) =
vector of times for periodic message recording
(
function of
velocity
.
Tpma
(
v
) =
vector of times for periodic message recording from probe
management
Tstop
=
length between stop messages when vehicle stopped
(
15
s
)
Tstopdelay
=
delay time at v
=
0
before observing vehicle stop
(
5
s
)
Vstart
=
minimum velocity to observe vehicle start