发明名称 |
Hydraulic control apparatus of automatic transmission |
摘要 |
A hydraulic control unit of an automatic transmission calculates deceleration during a coasting downshift, and calculates a piston play offsetting time, that is, the lag time that elapses between a shift decision and the start of the shift, on the basis of a correction value determined in accordance with the lag time learned from the previous shift. Based on the rate of deceleration and the piston play offsetting time, the downshift line in the speed shift map is corrected, that is, advanced in timing. Using this timing-advanced shift line, the control unit makes an earlier shift decision such that the shift starts in a proper state of operation, thus reducing shift shock during a coasting downshift and preventing excessive engine speed during a high-speed upshift.
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申请公布号 |
US5954776(A) |
申请公布日期 |
1999.09.21 |
申请号 |
US19970909888 |
申请日期 |
1997.08.12 |
申请人 |
AISIN AW CO., LTD. |
发明人 |
SAITO, MASAO;CHIBA, MASAHARU;KUWATA, MASAYUKI;TAGUCHI, MASATOSHI;SUZUKI, KENJI;TSUTSUI, HIROSHI |
分类号 |
F16H61/04;F16H59/24;F16H59/36;F16H59/44;F16H59/72;F16H61/00;F16H61/02;F16H61/08;F16H61/10;(IPC1-7):G06F17/00 |
主分类号 |
F16H61/04 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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