Device for controlling automatic transmission
AssigneesJATCO Ltd, Nissan Motor Co., Ltd.
InventorGo Endo
Life of this patent
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Abstract
A device for controlling an automatic transmission including a first frictional engagement element that is engaged at a first gear shift stage and is released at a second gear shift stage, the device including a piston stroke return determination means for determining a released state of a piston that is actuated to press friction discs of the first frictional engagement element, and a gear shift start determination means for restricting execution of a gear shift from the second gear shift stage to the first gear shift stage until it is determined that the piston is in a predetermined released state after a gear shift from the first gear shift stage to the second gear shift stage is finished.
Claims6
A device for controlling an automatic transmission, the automatic transmission comprising a first frictional engagement element that is engaged at a first gear shift stage and is released at a second gear shift stage, the device for controlling an automatic transmission comprising:
- a piston stroke return determination means for detecting a released state of a piston that is actuated to press friction discs of the first frictional engagement element;
- and
- a gear shift start determination means for restricting execution of a gear shift from the second gear shift stage to the first gear shift stage until it is determined that after a gear shift from the first gear shift stage to the second gear shift stage is finished, a stroke of the piston is returned from a completely engaged state and the piston is in a predetermined released state.
Dependencies are inferred from the claim text.