Tire state determination system, tire state determination apparatus, tire state determination method, and program

A tire state determination apparatus for determining a current state of a base body portion of a tire that is used for travelling of a vehicle, the base body portion corresponding to a base tire, the tire state determination apparatus comprising:

• an acquisition portion configured to acquire tire-related information that is capable of exerting influence on deterioration of the base body portion;
• and
• a state determination portion configured to determine the current state of
• the base body portion based on the tire-related information, wherein
• the acquisition portion is configured to acquire a degree of uneven wear of the tire,
• the state determination portion is configured to determine the current state of the base body portion based on the degree of the uneven wear, and
• the state determination portion includes an evaluation value calculation portion configured to calculate an evaluation value indicative of the state of the base body portion according to the following formula (1) using the above-mentioned each numerical value of the state data:
• S
• =
• S
• 0
• ·
• h
• ·
• Math
• k
• =
• 1
• 12
• ·
• t
• k
• ⁢
• X
• k
• ,
• (
• 1
• )
• where S denotes the evaluation value, X1 denotes a tire rotation number, X2 denotes an average speed, X3 denotes a number of times of occurrence of excessive acceleration, X4 denotes a number of times of occurrence of excessive lateral direction acceleration, X5 denotes an inverse value of an average air pressure, X6 denotes an average temperature, X7 denotes a wear amount, X8 denotes an uneven wear amount, X9 denotes a number of times of occurrence of excessive steering angle, X10 denotes a number of times of braking, X11 denotes a number of times of occurrence of an excessive step amount, X12 denotes an inverse value of a groove depth of the tire, and S0 denotes a reference evaluation value, and
• where the coefficient tk (t1, t2, t3, . . . , t12) is a weight coefficient assigned to each value Xk (t1, t2, t3, . . . , t12), and the coefficient h is a weight coefficient applicable in correspondence with a travel distance.

A tire state determination method for determining a current state of a base body portion of a tire that is used for travelling of a vehicle, the base body portion corresponding to a base tire, the tire state determination method comprising:

• an acquisition step of acquiring tire-related information that is capable of exerting influence on deterioration of the base body portion;
• and
• a state determination step of determining the current state of the base body portion based on the tire-related information, wherein
• the acquisition step acquires a degree of uneven wear of the tire,
• the state determination step determines the current state of the base body portion based on the degree of the uneven wear,
• the determined current state of the base body portion indicates deterioration amount in the form of peeling, cracking, or damage to the base body portion of the tire, and
• the state determination portion includes an evaluation value calculation portion configured to calculate an evaluation value indicative of the state of the base body portion according to the following formula (1) using the above-mentioned each numerical value of the state data:
• S
• =
• S
• 0
• ·
• h
• ·
• Math
• k
• =
• 1
• 12
• ·
• t
• k
• ⁢
• X
• k
• ,
• (
• 1
• )
• where S denotes the evaluation value, X1 denotes a tire rotation number, X2 denotes an average speed, X3 denotes a number of times of occurrence of excessive acceleration, X4 denotes a number of times of occurrence of excessive lateral direction acceleration, X5 denotes an inverse value of an average air pressure, X6 denotes an average temperature, X7 denotes a wear amount, X8 denotes an uneven wear amount, X9 denotes a number of times of occurrence of excessive steering angle, X10 denotes a number of times of braking, X11 denotes a number of times of occurrence of an excessive step amount, X12 denotes an inverse value of a groove depth of the tire, and S0 denotes a reference evaluation value, and
• where the coefficient tk (t1, t2, t3, . . . , t12) is a weight coefficient assigned to each value Xk (t1, t2, t3, . . . , t12), and the coefficient h is a weight coefficient applicable in correspondence with a travel distance.

A non-transitory computer-readable storage medium containing a program for determining a current state of a base body portion of a tire that is used for travelling of a vehicle, the base body portion corresponding to a base tire, the program causing one or more processors to execute:

• an acquisition step of acquiring tire-related information that is capable of exerting influence on deterioration of the base body portion;
• and
• a state determination step of determining the current state of the base body portion based on the tire-related information, wherein
• the acquisition step acquires a degree of uneven wear of the tire,
• the state determination step determines the current state of the base body portion based on the degree of the uneven wear,
• the state determination portion includes an evaluation value calculation portion configured to calculate an evaluation value indicative of the state of the base body portion according to the following formula (1) using the above-mentioned each numerical value of the state data:
• S
• =
• S
• 0
• ·
• h
• ·
• Math
• k
• =
• 1
• 12
• ·
• t
• k
• ⁢
• X
• k
• ,
• (
• 1
• )
• where S denotes the evaluation value, X1 denotes a tire rotation number, X2 denotes an average speed, X3 denotes a number of times of occurrence of excessive acceleration, X4 denotes a number of times of occurrence of excessive lateral direction acceleration, X5 denotes an inverse value of an average air pressure, X6 denotes an average temperature, X7 denotes a wear amount, X8 denotes an uneven wear amount, X9 denotes a number of times of occurrence of excessive steering angle, X10 denotes a number of times of braking, X11 denotes a number of times of occurrence of an excessive step amount, X12 denotes an inverse value of a groove depth of the tire, and S0 denotes a reference evaluation value, and
• where the coefficient tk (t1, t2, t3, . . . , t12) is a weight coefficient assigned to each value Xk (t1, t2, t3, . . . , t12), and the coefficient h is a weight coefficient applicable in correspondence with a travel distance.