Interrelated power delivery controls – including engine control – Transmission control – Transmission controlled by engine
Reexamination Certificate
2011-06-28
2011-06-28
Lewis, Tisha D (Department: 3655)
Interrelated power delivery controls, including engine control
Transmission control
Transmission controlled by engine
C477S107000, C477S110000, C701S054000, C701S055000, C701S065000
Reexamination Certificate
active
07967726
ABSTRACT:
A method of controlling an automatic transmission includes determining whether a coast-down control condition is met, and performing coast-down control if the condition is met. The coast-down control includes selectively downshifting, such that engine speed is maintained above a fuel-cut threshold speed. The coast-down control condition may include a throttle opening being below a threshold opening, a shift-speed being higher than or equal to a threshold shift-speed, and a road slope being smaller than a predetermined slope. The method may also include determining whether a deceleration lock-up control condition is met, and performing deceleration lock-up control, including engaging a lock-up clutch, if the condition is met. The deceleration lock-up control condition may include a throttle opening being below a threshold opening, a shift-speed being below a threshold shift-speed, a brake not being operated, and a difference between an engine speed and a turbine speed being smaller than a reference value.
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Hyundai Motor Company
Lewis Tisha D
Morgan & Lewis & Bockius, LLP
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