SYSTEMS FOR MANAGING DOWNSHIFTS IN HYBRID-ELECTRIC VEHICLES
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United States of America Patent
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Jan 19, 2016
Grant Date -
Jan 28, 2016
app pub date -
Jul 23, 2014
filing date -
Jul 23, 2014
priority date (Note) -
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Abstract
Systems for managing downshifts in hybrid-electric vehicles are disclosed. The systems include a multispeed transmission, an internal combustion engine selectively coupled to the multispeed transmission, an electric motor coupled to the multispeed transmission, and an electronic control unit. The electronic control unit is programmed to evaluate a torque demand, start the internal combustion engine, and pre-stage a downshift shift sequence by partially disengaging a second shift clutch and partially engaging a first shift clutch. The electronic control unit is also programmed to interrupt the downshift shift sequence until a pre-determined torque supplemental event occurs and later complete the downshift shift sequence by modifying the hydraulic pressure through the valve body to completely disengage a second gear set from the input shaft with the second shift clutch and completely engage a first gear set and the input shaft with the first shift clutch.
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