DACS Research Group - Connect and Drive 2011

In the Connect And Drive System
vehicles communicatie using a technique similar to Wi-Fi
so that they can drive and regulate their speed cooperatively
Current high-end cars are sometimes equiped with a system
called Adaptive Cruise Control, or ACC
ACC uses a radar to measure the distance
to the preceiding vehicle called "the headway"
and tries to keep this headway constant
ACC has some dificulties doing this
since its radar is slow to detect
If a preceiding vehicle is accelerating or breaking
CnD enhances ACC by letting vehicles communicate via Wi-Fi
Ten times per second, vehicles broadcast
their current position, their speed and their
acceleration and decceleration
With this information, other vehicles
can regulate their speed much faster and much more precise
Thus keeping the distance to the preceiding vehicle constant
We call this Cooperate Adaptive Cruise Control, or CACC
The contribution of the DACS group
from the University of Twente is the following
First for the merging procedures that you have seen here
We developed the control algorithms and also for the merging
procedure, we developed the geocasting algorithms
So the mechinisms that distribute the packets between the cars
The idea is: that there is a roadside unit over here
cars approaching the merging area and get messages in mutliple hops
and we control how these packets are distributed between the cars
Then the third contribution of our group
is the beaconing, especially the definition of all the package formats
but also, if we look at a system like: here with seven cars
So there is no issue with load of the network, plenty of space
but later on if we have like a 100 cars, there might be issues with load
and you can see here for instance that, if you would have a 100 cars
at 10 Hz beaconing rate, than only 10% of the packets get through
And we make adaptations to networks to deal with that kind of problems