Electric variable transmission for hybrid electric vehicles with two forward modes and four fixed gears
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United States of America Patent
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Apr 10, 2012
Grant Date -
Nov 5, 2009
app pub date -
May 2, 2008
filing date -
May 2, 2008
priority date (Note) -
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Abstract
The present disclosure provides a power split transmission with two Electric Variable Transmission (EVT) modes and four fixed gears for use in hybrid electrical vehicles (HEV). The present disclosure utilizes two electric motors (“E-motors”), an engine, three planetary gear sets, and four selectively engageable clutches. The clutches are engaged in different combinations to engage the different gears and EVT modes. In the four fixed gears, power is transmitted only on the mechanical path for the highest transmission efficiency. In the two EVT modes, a part of the power is transmitted electrically. Alternatively, the E-motors can be located in the middle integrated with the transmission design. Advantageously, the present invention works with lower component speeds than existing two-mode hybrid transmissions. This can be achieved with a front E-motor design enabling modularity and also with a center E-motor design.
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