发明名称 |
Control device for continuously variable transmission for vehicles and method of controlling the same |
摘要 |
In a continuously variable transmission of the type in which a speed change ratio is changed in a manner that the radius of rotation of a belt wound around a drive pulley and a driven pulley is varied by changing the width of a groove between the pulley parts of each pulley with an oil pressure. A control means for controlling an oil pressure in various control modes shifts the control mode from a hold mode to a start mode, when a driver manipulates a vehicle carrying the continuously variable transmission with his intention to start the vehicle, and an amount of discharge flow of an oil pump for generating an oil pressure exceeds a preset value. The safety factor in a stationary state is calculated using the effective tension of the CVT belt, secondary side oil pressure, and the speed change ratio. Using the calculated stationary state safety factor, a manipulated variable previously gained, and a changing rate of the primary oil pressure, a safety factor in a speed change state (transient state) is calculated. A manipulated variable of the speed change control means is limited so that the safety factor in a speed changing state exceeds a predetermined value. When the speed change performance may be damaged with the limitation of manipulated variable, a necessary quantity of the line pressure or the CVT input torque is corrected so as to increase the limit value.
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申请公布号 |
US5259272(A) |
申请公布日期 |
1993.11.09 |
申请号 |
US19920951115 |
申请日期 |
1992.09.25 |
申请人 |
MITSUBISHI DENKI K.K.;SUZUKI MOTOR CORP. |
发明人 |
YAMAMOTO, HIROAKI;YAMASHITA, YOSHINORI;TANIGUCHI, KATSUHIKO |
分类号 |
B60W10/06;B60W30/18;F16H59/06;F16H61/00;F16H61/12;F16H61/66;F16H61/662;(IPC1-7):F16H61/02 |
主分类号 |
B60W10/06 |
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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