Life determination device and life determination method
AssigneeToyota Jidosha Kabushiki Kaisha
InventorsShogo Tanaka, Ryo Kanda, Seiji Kanda, Ryoko Tanaka, Takuma Endo
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Abstract
An ECU is configured to determine the life of a pressure storage tank. The pressure storage tank has a gas chamber filled with gas, an oil chamber connected to a common passageway, and a piston dividing the gas chamber and the oil chamber. The pressure storage tank is configured to store hydraulic oil in the oil chamber and to release the hydraulic oil from the oil chamber. The ECU calculates a movement amount of the piston based on the volume change of the gas chamber. The ECU determines that the life of the pressure storage tank has ended when an integrated value of the calculated movement amount exceeds a threshold value.
Claims4
A life determination device for determining a life of a pressure storage tank, wherein
- the pressure storage tank has a gas chamber filled with gas, an oil chamber connected to an oil path, and a piston dividing the gas chamber and the oil chamber, and
- the pressure storage tank is configured to store hydraulic oil in the oil chamber and to release the hydraulic oil from the oil chamber,
- the life determination device comprising:
- a movement amount calculation section that calculates a movement amount of the piston based on a volume change of the gas chamber;
- and
- a life determination section determining that a life of the pressure storage tank has ended when an integrated value of the movement amount calculated by the movement amount calculation section exceeds a threshold value.
A life determination method for determining a life of a pressure storage tank, wherein
- the pressure storage tank has a gas chamber filled with gas, an oil chamber connected to an oil path, and a piston dividing the gas chamber and the oil chamber, and
- the pressure storage tank is configured to store hydraulic oil in the oil chamber and to release the hydraulic oil from the oil chamber,
- the life determination method comprising the steps of:
- calculating an amount of movement of the piston based on a volume change of the gas chamber;
- and
- determining that the life of the pressure storage tank has ended when an integrated value of the calculated movement amount exceeds a threshold value.
Dependencies are inferred from the claim text.