Work vehicle and control method thereof
US-2015367851-A1 · Dec 24, 2015 · US
Method for controlling gear ratio of continuously variable transmission vehicle
US2018372218A1 · US · A1
| Field | Value |
|---|---|
| Publication number | US-2018372218-A1 |
| Application number | US-201715815052-A |
| Country | US |
| Kind code | A1 |
| Filing date | Nov 16, 2017 |
| Priority date | Jun 26, 2017 |
| Publication date | Dec 27, 2018 |
| Grant date | — |
How to read this patent
A practical reading order for non-experts. Skip the full description unless you need deep technical detail.
- Title
What the patent document calls the invention.
- Abstract
A short plain-language summary of the technical disclosure.
- Assignees and inventors
Who owns or filed the patent and who is credited as inventor.
- Key dates
Filing, priority, publication, and grant dates set the timeline.
- First independent claim
The legal scope of protection — read this for what is actually claimed.
- CPC / IPC classifications
Technology tags used to group this patent with similar filings.
- Citations and related patents
Prior art links and similar publications in this corpus.
Abstract
Official abstract text for this publication.
A method for controlling a gear ratio of a continuously variable transmission vehicle includes: a step of detecting a position of a shift lever by a controller; a step of checking, by the controller, a gear ratio variation based on a difference between a desired stage gear ratio and a current gear ratio in a continuously variable transmission when the shift lever is detected to be positioned in a manual range; a step of calculating, by the controller, a gear ratio correction value based on a rate of change of engine RPM when the gear ratio variation is checked as being other than zero after the step of checking the gear ratio variation; and a step of correcting, by the controller, the gear ratio variation in response to the calculated gear ratio correction value after the calculation step.
First claim
Opening claim text (preview).
What is claimed is: 1 . A method for controlling a gear ratio of a continuously variable transmission vehicle, the method comprising: detecting a position of a shift lever by a controller; checking, by the controller, a gear ratio variation based on a difference between a desired stage gear ratio and a current gear ratio in a continuously variable transmission when the shift lever is detected to be positioned in a manual range; calculating, by the controller, a gear ratio correction value based on a rate of change of engine revolutions per minute (RPM) when the gear ratio variation is checked as being other than zero (“0”), after the checking the gear ratio variation; and correcting, by the controller, the gear ratio variation in response to the calculated gear ratio correction value, after the calculating the gear ratio correction value. 2 . The method according to claim 1 , wherein, in the calculating the gear ratio correction value, the controller calculates the gear ratio correction value in proportion to the rate of change of engine RPM. 3 . The method according to claim 1 , wherein, in the correcting the gear ratio variation, when the checked gear ratio variation is greater than “0”, the controller performs correction only when the gear ratio correction value is smaller than “0”. 4 . The method according to claim 1 , wherein, in the correcting the gear ratio variation, when the checked gear ratio variation is smaller than “0”, the controller performs correction only when the gear ratio correction value is greater than “0”. 5 . The method according to claim 1 , wherein, in the checking the gear ratio variation, the controller checks the gear ratio variation only when the desired stage gear ratio is not a minimum or maximum stage gear ratio. 6 . The method according to claim 1 , wherein the controller sets the gear ratio variation at “0” when the desired stage gear ratio is a minimum or maximum stage gear ratio, and the controller determines the current gear ratio as the desired stage gear ratio.
Assignees
Inventors
Classifications
the shifting of the transmission being manually controlled · CPC title
Rate of change of input or turbine shaft speed · CPC title
characterised by changing ratio in the mechanical gearing · CPC title
Motor capacity control by mechanical control means, e.g. by levers or pedals · CPC title
the ratio being infinitely variable · CPC title
Patent family
Related publications grouped by family.
External sources
Frequently asked questions
Answers are generated from the same data shown on this page.
- What does patent US2018372218A1 cover?
- A method for controlling a gear ratio of a continuously variable transmission vehicle includes: a step of detecting a position of a shift lever by a controller; a step of checking, by the controller, a gear ratio variation based on a difference between a desired stage gear ratio and a current gear ratio in a continuously variable transmission when the shift lever is detected to be positioned in…
- Who is the assignee on this patent?
- Hyundai Motor Co Ltd, Kia Motors Corp
- What technology area does this patent fall under?
- Primary CPC classification F16H61/66. Mapped technology areas include Mechanical Engineering.
- When was this patent published?
- Publication date Thu Dec 27 2018 00:00:00 GMT+0000 (Coordinated Universal Time) (A1). Legal status and post-grant events are not shown on this page.
- What related patents are in patentsdb?
- We list 8 related publications on this page (citations in our corpus or others sharing the same primary CPC).