Apparatus and a method for controlling an automatic transmission
First Claim
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1. An apparatus for controlling an automatic transmission comprising:
- a plurality of friction engagement elements;
a controller for controlling a gear change by conducting an engage control and a release control, respectively, of two different friction engagement elements, wherein said controller determines transmission torque capacities of said friction engagement elements at gear changing based upon an input shaft torque of a speed change mechanism and a torque sharing ratio changing with time elapse, and also alters a change velocity of said torque sharing ratio in accordance with the input shaft torque of the speed change mechanism.
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Abstract
In a constitution that a transmission torque capacities of friction engagement elements are determined based on an input shaft torque of a speed change mechanism and a torque sharing ratio, a change velocity of the torque sharing ratio of when the transmission torque capacity of a release side friction engagement element is changed from a value greater than a critical transmission torque capacity to a value smaller than the critical transmission torque capacity, is abruptly altered when the input shaft torque is equal to or less than predetermined value.
25 Citations
16 Claims
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1. An apparatus for controlling an automatic transmission comprising:
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a plurality of friction engagement elements;
a controller for controlling a gear change by conducting an engage control and a release control, respectively, of two different friction engagement elements, wherein said controller determines transmission torque capacities of said friction engagement elements at gear changing based upon an input shaft torque of a speed change mechanism and a torque sharing ratio changing with time elapse, and also alters a change velocity of said torque sharing ratio in accordance with the input shaft torque of the speed change mechanism. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A method for controlling an automatic transmission comprising the steps of:
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detecting an input shaft torque of a speed change mechanism;
setting a change velocity of a torque sharing ratio in accordance with said input shaft torque;
setting the torque sharing ratio based on said change velocity;
setting a transmission torque capacity of a friction engagement element at gear changing based on said input shaft torque and said torque sharing ratio. - View Dependent Claims (10, 11, 12, 13, 14, 15, 16)
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Specification