Hybrid vehicle drive system
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United States of America Patent
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Mar 14, 2017
Grant Date -
Sep 24, 2015
app pub date -
Mar 18, 2015
filing date -
Mar 24, 2014
priority date (Note) -
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Abstract
A hybrid vehicle drive system, which permits an efficient change of a vehicle drive mode from any one of constant-speed-ratio engine drive modes to one of electric motor drive modes, with reduced deterioration of drivability of the hybrid vehicle. The hybrid vehicle drive system is constructed such that one of the electric motor drive modes can be established by releasing one of two coupling elements which are placed in the engaged state in a presently established one of the constant-speed-ratio engine drive modes, when the drive system is required to be switched from the above-described one of the constant-speed-ratio engine drive modes to any one of the electric motor drive modes, whereby the drive system can be efficiently switched from any one of the constant-speed-ratio engine drive modes to the above-indicated one of the electric motor drive modes, by simply releasing one of the above-indicated two coupling elements.
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