发明名称 |
Automatic transmission control having variable fluid pressure decreasing rate at gear shifting |
摘要 |
A vehicle automatic transmission control controls fluid pressure changes applied to a frictional engagement element which is being changed from an engaged state to a disengaged state at a stage before input shaft rotational speed starts to increase from the beginning of a down-shift control. The control instruction value is set to gradually decrease the applied fluid pressure and to increase the ratio of such decrease with elapsed time. Specifically, a solenoid is used to control the fluid pressure applied to a clutch. The duty-cycle instruction for the solenoid is determined based on a quadratic function expressed as: duty cycle value=initial value-at2. |
申请公布号 |
US6042506(A) |
申请公布日期 |
2000.03.28 |
申请号 |
US19980189628 |
申请日期 |
1998.11.10 |
申请人 |
DENSO CORPORATION |
发明人 |
KOZAKI, TETSUJI;TASHIRO, TSUTOMU |
分类号 |
F16H61/06;(IPC1-7):F16H61/06;F16H61/08 |
主分类号 |
F16H61/06 |
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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