Vehicle management method, vehicle management system, and computer system
A vehicle management method includes: obtaining first SOH information that indicates a degree of deterioration of a power storage device of a vehicle based on charge data on the power storage device measured while the vehicle is executing external charge of the power storage device using power supplied externally; obtaining second SOH information that indicates the degree of deterioration of the power storage device based on history data about deterioration of the power storage device recorded in the vehicle when the vehicle is not executing external charge of the power storage device; and determining whether the history data have been tampered with by comparing the first SOH information and the second SOH information.
1 . A vehicle management method comprising:
obtaining, by an electronic control unit (ECU), a first state-of-health (SOH) information that indicates a degree of deterioration of a power storage device of a vehicle based on charge data on the power storage device measured by a battery sensor while the vehicle is executing external charge of the power storage device using power supplied externally;
obtaining, by the ECU, a second SOH information that indicates the degree of deterioration of the power storage device based on history data recorded in the vehicle when the vehicle is not executing external charge of the power storage device, the history data including at least one of temperature, voltage, current, or state of charge of the power storage device;
determining, by the ECU, whether the history data has been tampered with by comparing the first SOH information and the second SOH information; and
in response to determining that the history data has been tampered with, deleting a tampered portion of the history data stored in a memory of the vehicle.
2 . The vehicle management method according to claim 1 , further comprising determining whether the charge data for obtaining the first SOH information has been measured, wherein
the determining as to whether the history data has been tampered with includes determining whether the history data has been tampered with by comparing the first SOH information that indicate a present degree of deterioration of the power storage device and the second SOH information when it is determined that the charge data for obtaining the first SOH information has been measured.
3 . The vehicle management method according to claim 1 , wherein the determining as to whether the history data has been tampered with includes
obtaining an SOH deviation degree that indicates a degree of deviation between the degree of deterioration indicated by the first SOH information and the degree of deterioration indicated by the second SOH information,
obtaining a time deviation degree that indicates a degree of deviation between a time for the first SOH information and a time for the second SOH information, and
determining based on the SOH deviation degree and the time deviation degree whether the history data has been tampered with.
4 . The vehicle management method according to claim 1 , further comprising:
calculating a lease fee of the vehicle or the power storage device based on the second SOH information when the vehicle or the power storage device is provided to a vehicle user by lease; and
informing the vehicle user of the calculated lease fee.
5 . The vehicle management method according to claim 1 , wherein:
the charge data on the power storage device indicate at least one of a current and a voltage of the power storage device during external charge;
the history data on the power storage device indicate at least one of a state of the power storage device taken while the vehicle is traveling and a state of the power storage device taken when the vehicle is left alone; and
each of the first SOH information and the second SOH information indicates a capacity retention rate or an internal resistance of the power storage device.
6 . The vehicle management method according to claim 1 , wherein the second SOH information is obtained based on history data about deterioration of the power storage device recorded in the vehicle since a reference time until immediately before start of external charge.
7 . The vehicle management method according to claim 1 , wherein the second SOH information is obtained when a display condition for displaying predetermined information is met.
8 . A computer system comprising:
one or more processors; and
one or more storage devices that store a program that causes the one or more processors to execute the vehicle management method according to claim 1 .
9 . A vehicle management system comprising:
a vehicle including a power storage device and a storage device;
power supply equipment that supplies power for external charge of the power storage device; and
a server configured to be communicable with each of the vehicle and the power supply equipment, wherein
the vehicle is configured to record history data about deterioration of the power storage device in the storage device when external charge of the power storage device is not executed, the history data including at least one of temperature, voltage, current, or state of charge of the power storage device, and
the server is configured to
acquire charge data on the power storage device from the vehicle or the power supply equipment after the vehicle executes external charge of the power storage device using the power supply equipment, the charge data being measured by a battery sensor during the external charge,
obtain, from an electronic control unit (ECU) of the vehicle, first state-of-health (SOH) information that indicates a degree of deterioration of the power storage device based on the charge data on the power storage device,
acquire the history data on the power storage device from the vehicle or the power supply equipment,
obtain second SOH information that indicates a degree of deterioration of the power storage device based on the history data on the power storage device, and
determine whether the history data has been tampered with by comparing the first SOH information and the second SOH information; and
in response to a determination that the history data has been tampered, delete a tampered portion of the history data stored in the storage device of the vehicle.