Shift control apparatus and method of continuously variable transmission
AssigneeJATCO Ltd
InventorsAtsufumi Kobayashi, Tatsuo Ochiai, Takuro Kawasumi
Life of this patent
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Abstract
A shift control apparatus of a CVT installed in a non-ABS equipped vehicle is arranged to estimate a condition of a transmission ratio of the CVT, to prohibit a shift operation of varying the transmission ratio to a high-speed-side transmission ratio relative to a first predetermined transmission ratio when the driving-wheel acceleration is greater than or equal to a predetermined acceleration, and to cancel the prohibition of the shift operation when the transmission ratio is in a high speed side relative to a second transmission ratio under a condition that the driving-wheel acceleration becomes greater than or equal to the predetermined acceleration.
Claims11
A shift control apparatus of a continuously variable transmission (CVT) which is installed in a vehicle equipped with a brake system except for an antilock brake system, the shift control apparatus comprising:
- a controller arranged
- (a) to obtain a driving-wheel acceleration,
- (b) to estimate a condition of a transmission ratio of the CVT,
- (c) when the driving-wheel acceleration is greater than or equal to a predetermined acceleration that is a spin determination acceleration value for determining wheel spin, to prohibit an upshift operation of varying the transmission ratio to a high speed side transmission ratio relative to a first predetermined transmission ratio, and
- (d) when the transmission ratio is in a high speed side relative to a second predetermined transmission ratio that is a high-speed-side transmission ratio as compared with the first predetermined transmission ratio, under the condition that the driving-wheel acceleration is greater than or equal to the predetermined acceleration, to cancel the prohibition of the upshift operation.
A method of executing a shift control of a continuously variable transmission (CVT) which is installed in a vehicle equipped with a brake system except for an antilock brake system, the shift control apparatus comprising the steps of:
- obtaining a driving-wheel acceleration;
- estimating a condition of a transmission ratio of the CVT;
- prohibiting an upshift operation of varying the transmission ratio to a high speed side transmission ratio relative to a first predetermined transmission ratio when the driving-wheel acceleration is greater than or equal to a predetermined acceleration that is a spin determination acceleration value for determining wheel spin;
- and
- canceling the prohibition of the upshift operation when the transmission ratio is in a high speed side relative to a second predetermined transmission ratio that is a high-speed-side transmission ratio as compared with the first predetermined transmission ratio, under the condition that the driving-wheel acceleration becomes greater than or equal to the predetermined acceleration.
A shift control apparatus of a continuously variable transmission (CVT) which is installed in a vehicle equipped with a brake system except for an antilock brake system, the shift control apparatus comprising:
- driving-wheel acceleration obtaining means for obtaining a driving-wheel acceleration;
- transmission ratio estimating means for estimating a condition of a transmission ratio of the CVT;
- prohibiting means for prohibiting an upshift operation of varying the transmission ratio to a high speed side transmission ratio relative to a first predetermined transmission ratio, when the driving-wheel acceleration is greater than or equal to a predetermined acceleration that is a spin determination acceleration value for determining wheel spin;
- and
- canceling means for canceling the prohibition of the upshift operation when the transmission ratio is in a high speed side relative to a second predetermined transmission ratio that is a high-speed-side transmission ratio as compared with the first predetermined transmission ratio, under the condition that the driving-wheel acceleration is greater than or equal to the predetermined acceleration.
Dependencies are inferred from the claim text.