Route planning for increased braking performance in a fuel cell powered vehicle

A computer-implemented method performed by a computer system in a heavy-duty vehicle comprising a fuel-cell system and an electrical energy storage system, ESS, the method comprising

• identifying, by processing circuitry of the computer system, a downhill portion of a trip to be undertaken by the heavy-duty vehicle,
• determining, by the processing circuitry, at least two candidate routes leading from a starting location along the trip to an onset of the downhill portion of the trip,
• predicting, by the processing circuitry, a state of energy, SoE, of the ESS at the onset of the downhill portion for each candidate route, and
• selecting, by the processing circuitry, a proposed route out of the candidate routes at least in part based on the predicted SoE for each candidate route and on an estimated amount of energy regenerated by traversing the downhill portion of the trip.