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Mechatronic hybrid transmissions having three planetary gear sets

A planetary gear set, gear set technology, applied in the direction of gear transmission, transmission, transmission control, etc., can solve problems such as loss

Inactive Publication Date: 2009-05-06
GM GLOBAL TECH OPERATIONS LLC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Two-mode EVTs offer the advantage of reduced motor-generator speed, but often suffer from losses due to high-pressure hydraulic pumps and clutches required for mode switching

Method used

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  • Mechatronic hybrid transmissions having three planetary gear sets
  • Mechatronic hybrid transmissions having three planetary gear sets
  • Mechatronic hybrid transmissions having three planetary gear sets

Examples

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Embodiment Construction

[0032] Referring to FIG. 1 , there is shown a powertrain 10 including an engine 12 connected to a preferred embodiment of an improved electric variable transmission (EVT), generally indicated at 14 . The transmission 14 is designed to receive at least a portion of its drive power from the engine 12 . As shown, the engine 12 has an output shaft that acts as an input member 17 of the transmission 14 . A transient torque damper (not shown) may also be implemented between the engine 12 and the input member 17 of the transmission.

[0033] In the illustrated embodiment, the engine 12 may be a fossil fuel engine, such as a gasoline or diesel engine, which is typically readily adapted to provide reliable power output at a selectable number of revolutions per minute (RPM).

[0034] Disregarding the means of connecting the engine 12 to the transmission input member 17 , the transmission input member 17 is operatively connected to a planetary gear set in the transmission 14 .

[0035]...

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PUM

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Abstract

The inventive family of electrically variable transmissions provides a low capacity, low cost electrically variable transmission mechanism comprising first, second and third differential gear sets, a battery, and three motors. The three motor / generators can work in concert to obtain an EVT with a continuously variable range of speeds, including reverse.

Description

[0001] Cross References to Related Applications [0002] This application claims priority to US Provisional Patent Application Serial No. 60 / 729,187, filed October 21, 2005, the contents of which are hereby incorporated by reference in their entirety. technical field [0003] The present invention relates to an electrically variable transmission having three planetary gear sets and three motor / generators controlled to provide a continuously variable speed ratio range. Background technique [0004] Electric hybrid vehicles offer the potential to significantly improve fuel combustion efficiency compared to their conventional configurations; however, their overall efficiency is limited by parasitic losses. In a single-mode electric variable transmission (EVT), most of these losses are due to the motor rotating at high speed. Two-mode EVTs offer the advantage of reduced motor-generator speed, but often suffer from losses due to high-pressure hydraulic pumps and clutches require...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F16H3/72F16H61/32
Inventor P·B·乌索罗
Owner GM GLOBAL TECH OPERATIONS LLC