Tire state determination system, tire state determination apparatus, tire state determination method, and program
A tire state determination system ( 100 ) acquires, from a vehicle ( 50 ), state data that includes various types of information that may exert influence on deterioration of a base body portion of a tire ( 1 ), and calculates an evaluation value S that indicates a state of the base body portion of the tire ( 1 ), based on the acquired state data. This allows an inspector who inspects an applicability to a base tire, to preliminarily grasp, as a material for determining whether it can be used as the base tire, the state of the base body portion of the tire.
1 . A tire state determination system 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 system comprising a processor or circuit configured to function as:
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,
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, X 1 denotes a tire rotation number, X 2 denotes an average speed, X 3 denotes a number of times of occurrence of excessive acceleration, X 4 denotes a number of times of occurrence of excessive lateral direction acceleration, X 5 denotes an inverse value of an average air pressure, X 6 denotes an average temperature, X 7 denotes a wear amount, X 8 denotes an uneven wear amount, X 9 denotes a number of times of occurrence of excessive steering angle, X 10 denotes a number of times of braking, X 11 denotes a number of times of occurrence of an excessive step amount, X 12 denotes an inverse value of a groove depth of the tire, and S 0 denotes a reference evaluation value, and
where the coefficient t k (t 1 , t 2 , t 3 , . . . , t 12 ) is a weight coefficient assigned to each value X k (t 1 , t 2 , t 3 , . . . , t 12 ), and the coefficient h is a weight coefficient applicable in correspondence with a travel distance.
2 . The tire state determination system according to claim 1 , wherein
the tire-related information is at least one or more of an air pressure of the tire, a temperature of the tire, a number of rotations of the tire, an acceleration at the tire, a frequency of occurrence of an acceleration exceeding a predetermined numerical value to the tire, a wear amount of the tire, a travel speed of the vehicle, an acceleration of the vehicle, a steering angle of the vehicle, a number of times of braking, an operation amount of braking, a travel route of the vehicle, the travel distance of the vehicle, road surface information indicating a state of a travel road surface, a weather during traveling, a temperature during traveling, a load applied to the tire during traveling, and a number of times of retreading.
3 . The tire state determination system according to claim 2 , wherein
the acquisition portion acquires the travel distance for each type of the travel route, and
the state determination portion determines the current state of the base body portion based on the travel distance for each type of the travel route.
4 . The tire state determination system according to claim 1 , wherein the processor or circuit is configured to function as a first determination portion configured to determine whether or not the base body portion is applicable to the base tire, based on a determination result of the state determination portion regarding the current state of the base body portion.
5 . The tire state determination system according to claim 4 , wherein
the state determination portion calculates, as the determination result, the evaluation value indicating the current state of the base body portion, based on the tire-related information, and
the first determination portion determines that the base body portion is applicable to the base tire under a first condition where the evaluation value is equal to or higher than a predetermined threshold, and determines that the base body portion is not applicable to the base tire under a second condition where the evaluation value is lower than the predetermined threshold.
6 . The tire state determination system according to claim 5 , wherein
the tire includes a storage portion storing identification information of the tire,
the acquisition portion acquires the tire-related information together with the identification information, and
the state determination portion calculates the evaluation value of the tire corresponding to the identification information.
7 . The tire state determination system according to claim 6 , wherein the processor or circuit is configured to function as a recording portion configured to perform a process to record the tire-related information onto a predetermined storage medium in association with the identification information.
8 . The tire state determination system according to claim 4 , wherein the processor or circuit is configured to function as a second determination portion configured to, under a condition where the first determination portion has determined that the base body portion is applicable to the base tire, determine a value of the tire as the base tire based on the determination result of the state determination portion.
9 . The tire state determination system according to claim 1 , wherein the processor or circuit is configured to function as an output processing portion configured to perform a process to output the determination result of the state determination portion or a calculation result of a calculation performed based on the determination result.
10 . 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, X 1 denotes a tire rotation number, X 2 denotes an average speed, X 3 denotes a number of times of occurrence of excessive acceleration, X 4 denotes a number of times of occurrence of excessive lateral direction acceleration, X 5 denotes an inverse value of an average air pressure, X 6 denotes an average temperature, X 7 denotes a wear amount, X 8 denotes an uneven wear amount, X 9 denotes a number of times of occurrence of excessive steering angle, X 10 denotes a number of times of braking, X 11 denotes a number of times of occurrence of an excessive step amount, X 12 denotes an inverse value of a groove depth of the tire, and S 0 denotes a reference evaluation value, and
where the coefficient t k (t 1 , t 2 , t 3 , . . . , t 12 ) is a weight coefficient assigned to each value X k (t 1 , t 2 , t 3 , . . . , t 12 ), and the coefficient h is a weight coefficient applicable in correspondence with a travel distance.
11 . 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, X 1 denotes a tire rotation number, X 2 denotes an average speed, X 3 denotes a number of times of occurrence of excessive acceleration, X 4 denotes a number of times of occurrence of excessive lateral direction acceleration, X 5 denotes an inverse value of an average air pressure, X 6 denotes an average temperature, X 7 denotes a wear amount, X 8 denotes an uneven wear amount, X 9 denotes a number of times of occurrence of excessive steering angle, X 10 denotes a number of times of braking, X 11 denotes a number of times of occurrence of an excessive step amount, X 12 denotes an inverse value of a groove depth of the tire, and S 0 denotes a reference evaluation value, and
where the coefficient t k (t 1 , t 2 , t 3 , . . . , t 12 ) is a weight coefficient assigned to each value X k (t 1 , t 2 , t 3 , . . . , t 12 ), and the coefficient h is a weight coefficient applicable in correspondence with a travel distance.
12 . 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, X 1 denotes a tire rotation number, X 2 denotes an average speed, X 3 denotes a number of times of occurrence of excessive acceleration, X 4 denotes a number of times of occurrence of excessive lateral direction acceleration, X 5 denotes an inverse value of an average air pressure, X 6 denotes an average temperature, X 7 denotes a wear amount, X 8 denotes an uneven wear amount, X 9 denotes a number of times of occurrence of excessive steering angle, X 10 denotes a number of times of braking, X 11 denotes a number of times of occurrence of an excessive step amount, X 12 denotes an inverse value of a groove depth of the tire, and S 0 denotes a reference evaluation value, and
where the coefficient t k (t 1 , t 2 , t 3 , . . . , t 12 ) is a weight coefficient assigned to each value X k (t 1 , t 2 , t 3 , . . . , t 12 ), and the coefficient h is a weight coefficient applicable in correspondence with a travel distance.