发明名称 |
Continuously variable transmission and control |
摘要 |
<p>A continuously variable transmission control system determines the desired speed ratio (DTR) for a continuously variable transmission (14) from various input data received from the vehicle and operator. The desired speed ratio is compared (S1) with a commanded speed ratio (COM.SR) to provide an error signal which establishes a new commanded speed ratio for the continuously variable transmission. The comparing process of desired speed ratio to commanded speed ratio is repeated until the error signal is substantially null. Also, the control provides an adaptive modifier for the actuator of the continuously variable transmission such that a comparison (S2) of actual transmission ratio to commanded speed ratio will determine if an adaptive modification is necessary. The control further provides a step control function which is operable when the ratio of the continuously variable transmission is moving toward an underdrive ratio. The step input commands a large change in the actuator control valve to thereby accommodate reducing the pressure in the controls of the continuously variable transmission and thereby change the ratio rapidly. <IMAGE></p> |
申请公布号 |
EP0899481(A2) |
申请公布日期 |
1999.03.03 |
申请号 |
EP19980202561 |
申请日期 |
1998.07.30 |
申请人 |
GENERAL MOTORS CORPORATION |
发明人 |
VUKOVICH, WILLIAM JOSEPH;KOENIG, MELISSA MEI |
分类号 |
F16H61/662;(IPC1-7):F16H61/00 |
主分类号 |
F16H61/662 |
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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