Speed change control system in automatic transmission

Details Speed change control system in automatic transmission Speed change control system in automatic transmission

1991-07-31

1993-03-09

Braun, Leslie A.

Machine element or mechanism

Rotary member or shaft indexing, e.g., tool or work turret

Preselected indexed position

74878, B60K 4106

Patent

active

051918145

ABSTRACT:
A control system in an automatic transmission for controlling the change-over of the three speed change patterns which are a speed change pattern having a cross gear ratio on a low speed side, a speed change pattern having a cross gear ratio on a high speed side and a speed change pattern having a normal gear ratio. According to this controlling system, when one of the three speed change pattern is selected based one a throttle opening and a vehicle speed, and when it is judged that the gear shift from a speed range in the present speed change pattern to a speed range in the selected speed change pattern falls under on of prohibited conditions, e.g., requiring engagement and/or disengagement of three or more frictional engaging elements for the gear shift, the gear shift is performed using a temporary speed change pattern (including the present speed change pattern) including a speed range not falling under the prohibited conditions. Thereafter, the pattern selection is repeated and the change-over between speed change pattern is performed under a gear shift condition not falling under the prohibited conditions.

REFERENCES:
patent: 4584906 (1986-04-01), Nagaoka et al.
patent: 4698763 (1987-10-01), Smyth
patent: 4733580 (1988-03-01), Kubo et al.
patent: 4742733 (1988-05-01), Schreiner
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patent: 4936167 (1990-06-01), Mehta
patent: 4982623 (1991-01-01), Yoshino et al.
patent: 4996893 (1991-03-01), Nakamura et al.
patent: 5067373 (1991-11-01), Kyohzuka et al.

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