SHIFT CONTROL METHOD OF AUTOMATIC TRANSMISSION
First Claim
1. A shift control method of an automatic transmission that controls a shift from an N speed achieved by engagement of first and second frictional elements to an N−
- 3 speed achieved by engagement of third and fourth frictional elements,wherein initial release of the second frictional element begins after initial release of the first frictional element begins, andinitial engagement of the fourth frictional element begins after initial engagement of the third frictional element begins, andwherein engagement of the third frictional element is completed after release of the second frictional element is completed.
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Abstract
A shift control method of an automatic transmission according to an exemplary embodiment of the present invention may control a shift from an N speed achieved by engagement of first and second frictional elements to an N−3 speed achieved by engagement of third and fourth frictional elements, wherein release of the second frictional element is completed after release of the first frictional element begins, and engagement of the fourth frictional element begins after engagement of the third frictional element begins, wherein the engagement of the third frictional element is completed after the release of the second frictional element is completed.
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Citations
15 Claims
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1. A shift control method of an automatic transmission that controls a shift from an N speed achieved by engagement of first and second frictional elements to an N−
- 3 speed achieved by engagement of third and fourth frictional elements,
wherein initial release of the second frictional element begins after initial release of the first frictional element begins, and initial engagement of the fourth frictional element begins after initial engagement of the third frictional element begins, and wherein engagement of the third frictional element is completed after release of the second frictional element is completed. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15)
- 3 speed achieved by engagement of third and fourth frictional elements,
Specification