Method of shift control in an automatic transmission
First Claim
1. A method of shift control in an automatic transmission in a vehicle, wherein up-shifts and down-shifts are controlled based on a shift map having at least one shift-up line and at least one shift-down line, said shift map being established corresponding to a relation between vehicle speeds and engine throttle openings, said shift-up line being established on a higher vehicle speed side than said shift-down line and a hysteresis zone being established between said shift-up line and said shift-down line, comprising the steps of:
- shifting down to a lower speed range when a point representing a traveling state of the vehicle on said shift map moves in a lower vehicle speed direction and crosses said shift-down line;
shifting up to a higher speed range when said point moves in a higher vehicle speed direction and crosses said shift-up line; and
shifting down to a lower speed range when said point is in said hysteresis zone after a shift of speed range and when engine power is increasing at a rate which is greater than a specified value.
2 Assignments
0 Petitions
Accused Products
Abstract
A method of shift control in an automatic transmission, wherein a shift map has a shift-up line and a shift-down line between each gear change which is used to conduct the shift control with a hysteresis zone being established between each shift-up line and shift-down line. The method includes the steps of shifting down a speed range when a point representing a traveling state on the shift map moves in the lower vehicle speed direction and crosses the shift-down line, shifting up a speed range when the point moves in the higher vehicle speed direction and crosses the shift-up line, and shifting down the speed range when the point is in the hysteresis zone after a shift and also the increasing rate of the engine power is greater than a specified value.
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Citations
5 Claims
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1. A method of shift control in an automatic transmission in a vehicle, wherein up-shifts and down-shifts are controlled based on a shift map having at least one shift-up line and at least one shift-down line, said shift map being established corresponding to a relation between vehicle speeds and engine throttle openings, said shift-up line being established on a higher vehicle speed side than said shift-down line and a hysteresis zone being established between said shift-up line and said shift-down line, comprising the steps of:
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shifting down to a lower speed range when a point representing a traveling state of the vehicle on said shift map moves in a lower vehicle speed direction and crosses said shift-down line; shifting up to a higher speed range when said point moves in a higher vehicle speed direction and crosses said shift-up line; and shifting down to a lower speed range when said point is in said hysteresis zone after a shift of speed range and when engine power is increasing at a rate which is greater than a specified value. - View Dependent Claims (2, 3, 4)
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5. A method of shift control in an automatic transmission in a vehicle, wherein up-shifts and down-shifts are controlled based on a shift map having at least one shift-up line and at least one shift-down line, said shift map being established corresponding to a relation between vehicle speeds and engine intake throttle opening, said shift-up line being established on a higher vehicle speed side than said shift-down line and a hysteresis zone being established between said shift-up line and said shift-down line, comprising the steps of:
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shifting down to a lower speed range when a point representing a traveling state of the vehicle on said shift map moves in a lower vehicle speed direction and crosses said shift-down line; shifting up to a higher speed range when said point moves in a higher vehicle speed direction and crosses said shift-up line; and shifting down to a lower speed range when said point is in said hysteresis zone after a shift of speed range and when engine power is increasing at a rate greater than a specified value.
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Specification