Method of controlling speed reduction ratio for continuously variable speed transmission
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United States of America Patent
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-
Mar 26, 1991
Grant Date -
N/A
app pub date -
Oct 19, 1988
filing date -
Oct 19, 1987
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A method of controlling a speed reduction ratio in a continuously variable speed transmission comprises detecting a vehicle speed when a vehicle is decelerated by utilizing an engine brake with an accelerator opening being essentially zero, determining a reference speed reduction ratio corresponding to the detected vehicle speed, detecting an actual vehicle speed change rate, detecting an allowable vehicle speed change rate, comparing the actual change rate with said allowable vehicle speed change rate, determining a corrected speed reduction ratio by adding a correction to the reference speed reduction ratio based on a difference between the actual vehicle speed change rate and the allowable vehicle speed change rate, and controlling the speed reduction ratio of the continuously variable speed transmission so as to coincide with the corrected speed reduction ratio.
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