SPEED-RATIO CONTROL APPARATUS FOR VEHICULAR CONTINUOUSLY VARIABLE TRANSMISSION
First Claim
1. A speed-ratio control apparatus for controlling a speed ratio of a continuously variable transmission disposed in a power transmitting path between a drive power source and a drive wheel of a vehicle, such that an actual input speed of said continuously variable transmission coincides with a target input speed set on the basis of a running condition of the vehicle, said speed-ratio control apparatus comprising:
- an acceleration-requirement determining portion operable, on the basis of a vehicle accelerating member, to determine whether non-rapid acceleration of the vehicle is required by an operator of the vehicle, and whether rapid acceleration of the vehicle is required by the operator; and
a target-input-speed setting portion operable, upon determination by said acceleration-requirement determining portion that said non-rapid acceleration of the vehicle is required by the operator, to (i) implement an instantaneous stepping increase of said target input speed to a first transient target input speed which is higher than said actual input speed, (ii) hold said target input speed at said first transient target input speed in a first portion of a rapid shifting period, (iii) instantaneously reduce, at the end of said first portion of the rapid shifting period, said target input speed to an initial value of a second transient target input speed which initial value is close to said actual input speed and lower than said first transient target input speed, and (iv) gradually increase, in a second portion of the rapid shifting period following said first portion, the target input speed back toward said first transient target input speed, and upon determination by said acceleration-requirement determining portion that said rapid acceleration of the vehicle is required by the operator, said target-input-speed setting portion holding the target input speed at said first transient target input speed during said rapid shifting period, without setting at said second transient target input speed.
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Accused Products
Abstract
A speed-ratio control apparatus for controlling a speed ratio of a continuously variable transmission of a vehicle, such that an actual input speed of the transmission coincides with a target input speed, the apparatus including an acceleration-requirement determining portion operable to determine whether non-rapid acceleration or rapid acceleration of the vehicle is required by a vehicle operator, and a target-input-speed setting portion operable, upon determination of the operator'"'"'s requirement for the non-rapid acceleration, to implement an instantaneous stepping increase of the target input speed to a first transient target value, (ii) hold the target input speed at the first transient target value in a first portion of a rapid shifting period, (iii) instantaneously reduce, at the end of the first portion of the rapid shifting period, the target input speed to an initial value of a second transient target value which initial value is close to the actual input speed and lower than the first transient target value, and (iv) gradually increase, in a second portion of the rapid shifting period, the target input speed back toward the first transient value, and upon determination of the operator'"'"'s requirement for the rapid acceleration, the target-input-speed setting portion holding the target input speed at the first transient target input speed during the rapid shifting period, without setting at the second transient target value.
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Citations
10 Claims
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1. A speed-ratio control apparatus for controlling a speed ratio of a continuously variable transmission disposed in a power transmitting path between a drive power source and a drive wheel of a vehicle, such that an actual input speed of said continuously variable transmission coincides with a target input speed set on the basis of a running condition of the vehicle, said speed-ratio control apparatus comprising:
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an acceleration-requirement determining portion operable, on the basis of a vehicle accelerating member, to determine whether non-rapid acceleration of the vehicle is required by an operator of the vehicle, and whether rapid acceleration of the vehicle is required by the operator; and
a target-input-speed setting portion operable, upon determination by said acceleration-requirement determining portion that said non-rapid acceleration of the vehicle is required by the operator, to (i) implement an instantaneous stepping increase of said target input speed to a first transient target input speed which is higher than said actual input speed, (ii) hold said target input speed at said first transient target input speed in a first portion of a rapid shifting period, (iii) instantaneously reduce, at the end of said first portion of the rapid shifting period, said target input speed to an initial value of a second transient target input speed which initial value is close to said actual input speed and lower than said first transient target input speed, and (iv) gradually increase, in a second portion of the rapid shifting period following said first portion, the target input speed back toward said first transient target input speed, and upon determination by said acceleration-requirement determining portion that said rapid acceleration of the vehicle is required by the operator, said target-input-speed setting portion holding the target input speed at said first transient target input speed during said rapid shifting period, without setting at said second transient target input speed. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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Specification