Control apparatus for vehicular automatic transmission
AssigneeToyota Jidosha Kabushiki Kaisha
InventorsTaichi Washio, Tsutomu Kawanishi
Life of this patent
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Abstract
When an alternator load torque Talt is larger than a threshold α, a lockup clutch is released. Thus, a deceleration G can be restrained from becoming too large due to the alternator load torque Talt. Besides, the threshold α is changed in accordance with a speed ratio γ of a continuously variable transmission. Thus, the deceleration G can be favorably controlled within a predetermined range. For example, in a vehicle state where a deceleration is unlikely to be achieved due to the smallness of the speed ratio γ, the threshold α is large. Therefore, the lockup clutch is unlikely to be released, and the deceleration G is likely to be secured.
Claims3
A control apparatus for a vehicular automatic transmission, the automatic transmission including a torque converter with a lockup clutch and a shifting portion, the control apparatus comprising:
- an electronic control unit configured to
- (a) perform engagement control of the lockup clutch during deceleration running accompanied by cutoff of fuel supply to an engine,
- (b) cancel engagement of the lockup clutch when a load of an auxiliary that is driven through rotation of the engine is equal to or larger than a threshold, and
- (c) change the threshold such that the threshold increases at least either as a speed ratio of the shifting portion decreases or as a vehicle speed rises.
Dependencies are inferred from the claim text.