Shift control for continuously-variable transmission
AssigneeNissan Motor Co., Ltd.
InventorsAkihiro Makiyama, Atsufumi Kobayashi
Life of this patent
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Abstract
A shift control apparatus for a continuously-variable transmission includes a controller for controlling a transmission ratio in a normal mode in accordance with a sensed vehicle speed and a sensed accelerator operation condition. The controller determines a second-mode downshift characteristic and a second-mode upshift characteristic in accordance with a driver's acceleration demand; and controls the transmission ratio in a kickdown shift control mode in response to a driver's acceleration request by performing a downshift operation to a target downshift transmission ratio determined according to the second-mode downshift characteristic and an upshift operation according to the second mode upshift characteristic.
Claims27
A shift control apparatus comprising:
- a continuously-variable transmission;
- a sensing section to sense a vehicle speed of a vehicle and an accelerator operation condition of the vehicle;
- and
- a controller
- to control an actual transmission ratio of the continuously-variable transmission normally in a first mode in accordance with the vehicle speed and accelerator operation condition,
- to produce a rapid acceleration request signal by monitoring an accelerator operation speed determined from the accelerator operation condition,
- to control the actual transmission ratio of the continuously-variable transmission in a second mode in response to the rapid acceleration request signal, by varying a target transmission ratio,
- to determine a second-mode downshift characteristic and a second-mode upshift characteristic in accordance with the accelerator operation condition, and
- to control the actual transmission ratio of the continuously-variable transmission in the second mode in response to the rapid acceleration request signal by performing a downshift operation to a target downshift transmission ratio determined according to the second-mode downshift characteristic and an upshift operation according to the second mode upshift characteristic.
A shift control process for a continuously-variable transmission, the shift control process comprising:
- producing a rapid acceleration request signal by monitoring an accelerator operation speed determined from a sensed accelerator operation condition;
- controlling an actual transmission ratio of the continuously-variable transmission normally in a first mode in accordance with a sensed vehicle speed and an accelerator operation quantity determined from the sensed accelerator operation condition when the rapid acceleration request signal is absent;
- determining a second-mode downshift characteristic and a second-mode upshift characteristic in accordance with the accelerator operation condition, and
- controlling the actual transmission ratio of the continuously-variable transmission in a second mode in response to the rapid acceleration request signal, by varying a target transmission ratio, by performing a downshift operation to the target downshift transmission ratio determined according to the second-mode downshift characteristic and an upshift operation according to the second mode upshift characteristic.
A shift control apparatus for a continuously-variable transmission, the shift control apparatus comprising:
- means for detecting a driver's kickdown acceleration request by monitoring variation of an accelerator operation condition;
- means for controlling an actual transmission ratio of the continuously-variable transmission in a normal mode in accordance with a sensed vehicle speed and a sensed accelerator operation quantity determined from the sensed accelerator operation condition when the kickdown acceleration request is absent;
- means for producing a rapid acceleration request signal by monitoring an accelerator operation speed determined from the accelerator operation condition,
- means for controlling the actual transmission ratio of the continuously-variable transmission in a kickdown mode in response to the rapid acceleration request signal, by varying a target transmission ratio,
- means for determining a kickdown-mode downshift characteristic and a kickdown-mode upshift characteristic in accordance with a driver's acceleration demand estimated by the sensed accelerator operation quantity, and means for controlling the actual transmission ratio of the continuously-variable transmission in a kickdown mode in response to the kickdown acceleration request signal, by performing a downshift operation to a target downshift transmission ratio determined according to the kickdown-mode downshift characteristic and an upshift operation according to the kickdown-mode upshift characteristic.
Dependencies are inferred from the claim text.