Apparatus and method for shift control of automatic transmission

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Details

74866, 74867, 364165, B60K 4118, G05D 1702

Patent

active

050290860

ABSTRACT:
Disclosed is a shift control for an automatic transmission adapted to shift speed ranges by coupling or decoupling of the friction coupling elements mounted on the transmission mechanism.
The coupling force of the friction coupling elements is subjected to feed-forward control during a preset period after a signal of instruction for shifting was given. A control value for the feed-forward control is determined in accordance with control value characteristics which vary from a given initial value at a constant change rate.
After the preset period, coupling force of the friction coupling element is feed-back controlled by of actual revolutions of an input shaft of the transmission mechanism. A final control value for the feed-back control is determined by determining a target change rate in the feed-back control by an amount of change in revolutions number of the input shaft of the transmission mechanism estimated by shifting and a set time for the feed-back control. With the target change rate, a target number of revolutions for each of plural control cycles obtainable by dividing the set time into portions. For each of the control cycles, the final control value is determined by comparing the actual number of revolutions of the input shaft and the target number of revolutions.

REFERENCES:
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patent: 4031782 (1977-06-01), Miller et al.
patent: 4283970 (1981-08-01), Vulkovich
patent: 4350058 (1982-09-01), Miller et al.
patent: 4670843 (1987-06-01), Matsumura et al.
patent: 4791568 (1988-12-01), Hiramatsu et al.
patent: 4793216 (1988-12-01), Hiramatsu et al.
patent: 4868753 (1989-09-01), Mori

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