Automatic transmission upshift timing
AssigneeToyota Motor Engineering & Manufacturing North America, Inc.
InventorDante T Boutell
Life of this patent
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Abstract
Methods and apparatus for control of a transmission are described, including provision of a shift initiation signal to the transmission when the engine speed attains an initiation point engine speed, the initiation point engine speed being adjustable as a function of a rate of change of engine speed so as to reduce engine speed variability at shift endpoints.
Claims19
A controller for a transmission, the transmission being associated with an engine, the controller being operable to provide a shift initiation signal to the transmission when the engine speed attains an initiation point engine speed,
- the controller being operable to adjust the initiation point engine speed as a differential function of a rate of change of engine speed with respect to time, so as to reduce dependence of an endpoint engine speed on the rate of change of engine speed.
A controller for a transmission, the transmission being an automatic transmission associated with a vehicle engine, the controller being operable to provide a shift initiation signal to the transmission so as to induce a shift,
- the shift initiation signal for an upshift being provided at an initiation point engine speed,
- the initiation point engine speed being determined as a differential function of a rate of change of engine speed with respect to time, so as to reduce an endpoint engine speed dependence on the rate of increase of engine speed.
A method of controlling a transmission, the transmission being coupled to an engine, the method comprising:
- initiating a transmission shift at an initiation point engine speed, the transmission shift being an upshift, the initiation point engine speed being adjusted as a differential function of a rate of change of engine speed with respect to time so as to reduce dependence of an endpoint engine speed on the rate of increase of engine speed.
Dependencies are inferred from the claim text.