Transmission for vehicle
US-9574638-B2 · Feb 21, 2017 · US
Transmission for electric vehicle
US10041568B2 · US · B2
| Field | Value |
|---|---|
| Publication number | US-10041568-B2 |
| Application number | US-201514943969-A |
| Country | US |
| Kind code | B2 |
| Filing date | Nov 17, 2015 |
| Priority date | Aug 7, 2015 |
| Publication date | Aug 7, 2018 |
| Grant date | Aug 7, 2018 |
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- Title
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- Abstract
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Abstract
Official abstract text for this publication.
A transmission for an electric vehicle includes an input shaft for receiving power, an output shaft disposed in parallel with the input shaft, a plurality of shift gear units each including external gears connecting the input shaft and the output shaft to each other, a synchromesh system for switching any one of the shift gear units into a power-transmissible state or a non-power-transmissible state between the input shaft and the output shaft, a servo gear unit including a pair of external gears engaged with each other on the input shaft and the output shaft, and a servo clutch adjusting a degree of power transmission between the input shaft and the output shaft by the servo gear unit.
First claim
Opening claim text (preview).
What is claimed is: 1. A method of controlling a transmission for an electric vehicle, comprising: a servo engaging step of engaging a servo clutch to generate friction by means of a controller so that torque is transmitted from an input shaft to an output shaft through a servo gear unit when a power-on shift instruction to shift from a current engaged gear to a desired gear is given; a shifting-to-neutral step of disengaging a synchromesh system from the current engaged gear by operating the synchromesh system by means of the controller after the servo engaging step; a synchronizing step of synchronizing the synchromesh system with the desired gear by controlling the servo clutch by means of the controller; a desired gear engaging step of engaging the synchromesh system with the desired gear by operating the synchromesh system by means of the controller after the synchronizing step is completed; and a shift completing step of disengaging the servo clutch by means of the controller after the desired gear engaging step. 2. The method of claim 1 , wherein a transmission gear ratio of the servo gear unit is smaller than gear ratios of the current engaged gear and the desired gear, and the shifting-to-neutral step is performed when torque transmitted through the current engaged gear is changed to be transmitted through the servo gear unit by the servo engaging step. 3. The method of claim 1 , wherein in the synchronizing step, a speed of the input shaft is synchronized with a desired speed of a motor directly connected to the input shaft by controlling a force operating the servo clutch.
Assignees
Inventors
Classifications
specially adapted for electric vehicles · CPC title
- F16H3/089Primary
all of the meshing gears being supported by a pair of parallel shafts, one being the input shaft and the other the output shaft, there being no countershaft involved · CPC title
comprising means for power-shifting · CPC title
the gear ratios comprising three forward speeds · CPC title
Transmissions for multiple ratios · CPC title
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Frequently asked questions
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- What does patent US10041568B2 cover?
- A transmission for an electric vehicle includes an input shaft for receiving power, an output shaft disposed in parallel with the input shaft, a plurality of shift gear units each including external gears connecting the input shaft and the output shaft to each other, a synchromesh system for switching any one of the shift gear units into a power-transmissible state or a non-power-transmissible …
- Who is the assignee on this patent?
- Hyundai Motor Co Ltd
- What technology area does this patent fall under?
- Primary CPC classification F16H3/089. Mapped technology areas include Mechanical Engineering.
- When was this patent published?
- Publication date Tue Aug 07 2018 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 1 related publication on this page (citations in our corpus or others sharing the same primary CPC).