This article describes the activities carried out for the development of control strategies for a military operational extended range electric vehicle.
A series-hybrid (range extender) configuration has been selected for the application due to its advantages for remote operation. Control algorithms have been developed, implemented and tested, using HiL testing procedures, to manage the various systems involved in the electrification of the new prototype. Three different drive modes have been established to ensure the operability of the vehicle in different scenarios achieving great performance: the vehicle is capable of overcoming 60%+ slopes, range in pure EV mode over 50 km at maximum speed and reduced thermal and acoustic signatures for stealth operation.
Based on the diesel powered URO VAMTAC, the existing gearbox has been eliminated, the internal combustion engine has been modified and replaced by a smaller engine that will be directly coupled to the electric generator in order to extend the range of the vehicle. To propel the vehicle, two electric motors have been installed back to back, powered by a lithium-ion battery.
Development of control strategies
In order to optimize the vehicle’s operation at all times, control algorithms have been developed in the form of a state machine. This development has been carried out on a commercial software platform (Matlab-Simulink), where a series of finite states have been created in which the vehicle can be operating as a function of the state variables of the vehicle components and the driver’s instructions.