Abstract: A propulsion system according to the present invention comprises: a plurality of motors which rotate propellers of an electrical aircraft; a plurality of inverters which supply power to the motors; a plurality of refrigerant pipings through which a refrigerant for cooling the motors and the inverters flows; pumps which are connected to the refrigerant pipings and which send out the refrigerant; radiators which are connected to the refrigerant pipings and which discharge heat of the refrigerant; first switches which switch one of the refrigerant pipings through which the refrigerant flows; and a control unit which controls the first switches. There are a plurality of refrigerant pipings through which the pumps and the radiators are connected, and the control unit switches and controls the first switches when the pressure of the refrigerant in the refrigerant pipings deviates from a normal range.

Abstract: A diagnosis system includes: a charging control part that controls, upon connection between a vehicle and a charger provided at an outside of the vehicle, charging from the charger to a secondary battery provided on the vehicle; and a derivation part that derives a degradation degree of the secondary battery based on a change amount of a charging rate of the secondary battery and an integration value of a charging current of the secondary battery, wherein the charging control part determines, based on a remaining time until a next departure time of the vehicle, whether specific charging in which a charging pause period is provided in a middle of a charging time of the secondary battery is performed.

Abstract: A diagnosis system includes: a charging control part that controls, upon connection between a vehicle and a charger provided at an outside of the vehicle, charging from the charger to a secondary battery provided on the vehicle; and a derivation part that derives a degradation degree of the secondary battery based on a change amount of a charging rate of the secondary battery and an integration value of a charging current of the secondary battery, wherein the charging control part determines, based on a remaining time until a next departure time of the vehicle, whether specific charging in which a charging pause period is provided in a middle of a charging time of the secondary battery is performed.