Continuously variable transmission control device and control method
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United States of America Patent
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Jun 12, 2018
Issued Date -
Nov 9, 2017
app pub date -
Oct 23, 2015
filing date -
Nov 13, 2014
priority date (Note) -
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status (Latency Note)
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Abstract
A continuously variable transmission (100), wherein pressure equalization control is performed to make line pressure (PL) equal to secondary pressure (Psec) when prescribed start conditions are satisfied. During pressure equalization control, a secondary pressure indicated value (Psec_co) is raised by a prescribed amount (S10), then a line pressure indicated value (PL_co) is gradually decreased (S30). If determination is made that line pressure is the same as the secondary pressure after secondary actual pressure (Psec) is lowered (S40), then the line pressure is controlled so that the secondary actual pressure (Psec) becomes the secondary pressure indicated value (Psec_co) (S50). At the start of pressure equalization control, if the difference (ΔPsec) found by subtracting the secondary pressure indicated value from the secondary actual value is negative (S120), then a primary pressure indicated value is corrected on the basis of the difference (S130).
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