Damage estimation device and damage estimation method
AssigneeToyota Jidosha Kabushiki Kaisha
InventorHiroshi Fujitani
Life of this patent
Estimating the term…
Abstract
A damage estimation device includes an acquisition unit that acquires a temperature change amount in a period during which an inflow air temperature rises and a period length, a distortion amount derivation unit that derives a distortion amount of a cooling device in the above period, based on the temperature change amount, and a damage value derivation unit that derives an accumulated damage value by integrating a value depending on the distortion amount. When the period length is shorter than a period length determination value, the distortion amount derivation unit derives a larger value as the distortion amount than when the period length is equal to or longer than the period length determination value.
Claims6
A damage estimation system comprising:
- a damage estimation device that is installed in a vehicle and configured to estimate degree of fatigue accumulated in a cooling device, the cooling device being configured to cool air that flows through an intake passage, the damage estimation device including
- an acquisition unit configured to acquire a temperature change amount and a period length, the temperature change amount being a change amount of an inflow air temperature in a period during which the inflow air temperature rises, the inflow air temperature being a temperature of air that flows in the cooling device, the period length being a temporal length of the period,
- a distortion amount derivation unit configured to derive a distortion amount such that a value of the distortion amount is larger as the temperature change amount is larger, the distortion amount being degree of distortion of the cooling device in the period,
- a damage value derivation unit configured to derive an accumulated damage value by integrating a value depending on the distortion amount, the accumulated damage value being the degree of the fatigue accumulated in the cooling device, and
- a notification processing unit configured to give notice that replacement or maintenance of the cooling device is necessary, to an occupant of the vehicle, through a notification device when the accumulated damage value is larger than a threshold value;
- and
- the notification device, wherein
- a value of the distortion amount derived by the distortion amount derivation unit when the period length is shorter than a period length determination value is larger than a value of the distortion amount derived when the period length is equal to or longer than the period length determination value.
A damage estimation method for estimating degree of fatigue accumulated in a cooling device that is installed in a vehicle and configured to cool air that flows through an intake passage of a drive source, the damage estimation method comprising:
- acquiring a temperature change amount and a period length, the temperature change amount being a change amount of an inflow air temperature in a period during which the inflow air temperature rises, the inflow air temperature being a temperature of air that flows in the cooling device, the period length being a temporal length of the period;
- deriving a distortion amount such that a value of the distortion amount is larger as the acquired temperature change amount is larger, the distortion amount being degree of distortion of the cooling device in the period;
- and
- deriving an accumulated damage value by integrating a value depending on the derived distortion amount, the accumulated damage value being the degree of the fatigue accumulated in the cooling device;
- and
- giving notice that replacement or maintenance of the cooling device is necessary, to an occupant of the vehicle, when the accumulated damage value is larger than a threshold value, wherein
- in deriving the distortion amount, a value of the distortion amount derived when the period length is shorter than a period length determination value is larger than a value of the distortion amount derived when the period length is equal to or longer than the period length determination value.
Dependencies are inferred from the claim text.