| 摘要 |
PROBLEM TO BE SOLVED: To permit learning control of engaging pressure in accordance with a slip start required time during second downshift even when a release side friction engaging device has first downshift and the second downshift which are the same multiple downshift. SOLUTION: When 6→5 first downshift followed by 6→4 second downshift is output, the hydraulic pressure of the release side friction engaging device (a brake B1) is reset to stand-by pressure P<SB>W</SB>for the second downshift (6→4 down) and the stand-by pressure P<SB>w</SB>is held only for (quick drain time a + stand-by time b) and then sweep control is performed at the same change rateΔc as that of single downshift. Thus, hydraulic control is always started from the stand-by pressure P<SB>W</SB>in spite of a difference in timing for the second downshift output to suppress the dispersion of the slip start required time T<SB>T</SB>from the second downshift output, permitting learning control of the stand-by pressure P<SB>W</SB>in accordance with the slip start required time T<SB>T</SB>. COPYRIGHT: (C)2007,JPO&INPIT |
