Agricultural Tractors
TTControl has developed a steer-by-wire prototype for agricultural
tractors in cooperation with Ognibene.
The project's goal has been to demonstrate that steer-by-wire
can fulfill all legal obligations for the use on the road.
Many conditions have to be taken into account, but the most
important feature of a steer-by-wire system is the ability
to tolerate any single fault to avoid any dangerous situation.
| As the system must remain
operational in case of failures, it contains redundant
electronic control units and redundant sensors and actuators.
A TTP architecture is used for data communication. Single
failures were injected to verify that the redundancy
level introduced was enough to satisfy the R79 regulation
for steering systems. |
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The valves in the hydraulic circuit of the vehicle are
controlled by the electronic system. Since all movements
are controlled by the electronics, the system is highly
flexible and manages an extensive range of functions. The
failure of one sensor, one actuator, one bus line, or even
one whole ECU has no critical consequences for the behavior
of the control system.
More information can be found in Ognibene
Case Study.
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