Tire wear state estimation apparatus
US-2022203783-A1 · Jun 30, 2022 · US
Method for determining state of road surface
US12157474B2 · US · B2
| Field | Value |
|---|---|
| Publication number | US-12157474-B2 |
| Application number | US-202217826510-A |
| Country | US |
| Kind code | B2 |
| Filing date | May 27, 2022 |
| Priority date | May 31, 2021 |
| Publication date | Dec 3, 2024 |
| Grant date | Dec 3, 2024 |
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- Title
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- Abstract
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Abstract
Official abstract text for this publication.
A determining method for determining a state of a road surface includes: sequentially acquiring a rotational speed of tires mounted on the vehicle, sequentially acquiring a driving force of the vehicle, calculating a slip ratio based on the sequentially acquired rotational speed of the tires, calculating a regression equation and a confidence interval width for a relationship between the slip ratio and the driving force, based on data sets of the slip ratio and the driving force in a predetermined zone, and determining a state of the road surface on which the vehicle travels, based on the confidence interval width calculated for the predetermined zone.
First claim
Opening claim text (preview).
What is claimed is: 1. A determining method for determining a state of a road surface on which a vehicle travels, comprising: sequentially acquiring a rotational speed of tires mounted on the vehicle; sequentially acquiring a driving force of the vehicle; calculating a slip ratio based on the sequentially acquired rotational speed of the tires; calculating a regression equation and a confidence interval width for a relationship between the slip ratio and the driving force, based on a large number of data sets of the slip ratio and the driving force in a predetermined zone; and determining a state of the road surface on which the vehicle travels, based on the confidence interval width calculated for the predetermined zone. 2. The determining method according to claim 1 , wherein the calculating a confidence interval width includes calculating a confidence interval width for a plurality of vehicles in the predetermined zone, and the determining a state of the road surface includes determining that the road surface is slippery in a case in which an average value of the confidence interval width calculated for the predetermined zone is at least a predetermined threshold value. 3. The determining method according to claim 1 , wherein the calculating a confidence interval width includes calculating a confidence interval width for a plurality of vehicles in the predetermined zone, and the determining a state of the road surface includes determining that the road surface is slippery in a case in which a variance of the confidence interval width calculated for the predetermined zone is at least a predetermined threshold value. 4. The determining method according to claim 2 , wherein the calculating a confidence interval width includes calculating a confidence interval width for a plurality of vehicles in the predetermined zone, and the determining a state of the road surface includes determining that the road surface is slippery in a case in which a variance of the confidence interval width calculated for the predetermined zone is at least a predetermined threshold value. 5. The determining method according to claim 1 , further comprising performing filtering for removing measurement errors of the slip ratio and the driving force, before the calculating a regression equation and a confidence interval width for a relationship between the slip ratio and the driving force. 6. The determining method according to claim 2 , further comprising performing filtering for removing measurement errors of the slip ratio and the driving force, before the calculating a regression equation and a confidence interval width for a relationship between the slip ratio and the driving force. 7. The determining method according to claim 3 , further comprising performing filtering for removing measurement errors of the slip ratio and the driving force, before the calculating a regression equation and a confidence interval width for a relationship between the slip ratio and the driving force. 8. A determining device for determining a state of a road surface on which a vehicle travels, comprising: a rotational speed acquiring portion configured to sequentially acquire a rotational speed of tires mounted on the vehicle; a driving force acquiring portion configured to sequentially acquire a driving force of the vehicle; a slip ratio calculating portion configured to calculate a slip ratio based on the sequentially acquired rotational speed of the tires; a confidence interval width calculating portion configured to calculate a regression equation and a confidence interval width representing a relationship between the slip ratio and the driving force, based on a large number of data sets of the slip ratio and the driving force in a predetermined zone; and a determining portion configured to determine a state of the road surface, based on the confidence interval width calculated for the predetermined zone. 9. A non-transitory computer-readable medium storing a determining program for determining a state of a road surface on which a vehicle travels, the determining program causing a computer to execute: sequentially acquiring a rotational speed of tires mounted on the vehicle; sequentially acquiring a driving force of the vehicle; calculating a slip ratio based on the sequentially acquired rotational speed of the tires; calculating a regression equation and a confidence interval width for a relationship between the slip ratio and the driving force, based on a large number of data sets of the slip ratio and the driving force in a predetermined zone; and determining a state of the road surface on which the vehicle travels, based on the confidence interval width calculated for the predetermined zone.
Assignees
Inventors
Classifications
Wheel speed · CPC title
Wheel slip · CPC title
Filtering, filters · CPC title
Details of control systems for road vehicle drive control not related to the control of a particular sub-unit {, e.g. process diagnostic or vehicle driver interfaces} · CPC title
Means for informing the driver, warning the driver or prompting a driver intervention · CPC title
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Frequently asked questions
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- What does patent US12157474B2 cover?
- A determining method for determining a state of a road surface includes: sequentially acquiring a rotational speed of tires mounted on the vehicle, sequentially acquiring a driving force of the vehicle, calculating a slip ratio based on the sequentially acquired rotational speed of the tires, calculating a regression equation and a confidence interval width for a relationship between the slip r…
- Who is the assignee on this patent?
- Sumitomo Rubber Ind
- What technology area does this patent fall under?
- Primary CPC classification B60W40/064. Mapped technology areas include Operations & Transport.
- When was this patent published?
- Publication date Tue Dec 03 2024 00:00:00 GMT+0000 (Coordinated Universal Time) (B2). Legal status and post-grant events are not shown on this page.
- What related patents are in patentsdb?
- We list 7 related publications on this page (citations in our corpus or others sharing the same primary CPC).