An ON-OFF engine control system is used. That means that the engine is ON until the energy storage unit has been reached desired charge capacity and then is decoupled and stopped until the energy storage unit charge fall below its minimum requirement.
Brake controllers are electronic device that can control brakes remotely, deciding when braking begins ends, and how quickly the brake need to be applied.
During the braking operation the brake controller directs the electricity produced by the motor into the batteries or capacitors.