Patent ID: 11927232
Assignee: TOYOTA JIDOSHA KABUSHIKI KAISHA
Field: Mechanical elements (Mechanical engineering)
Classification: CPC F  G | IPC F  G

Claim 10:
11. A degradation estimation method that is applied to a vehicle equipped with an automatic transmission including either or both of a clutch and a brake as an engagement element to estimate a degree of degradation of a seal member attached to the engagement element of the automatic transmission, the method comprising causing a degradation estimation device to calculate a value of an output variable by inputting a thermal history variable and a load history variable as an input variable to the degradation estimation device, wherein the thermal history variable is a variable indicating a period during which the seal member has been exposed to a temperature within a predetermined temperature range, the load history variable is a variable indicating the number of times a load has acted on the seal member, the degradation estimation device stores mapping data, and the mapping data defines a map that outputs the output variable indicating the degree of degradation of the seal member when the input variable is input.