发明名称 |
Controller and control method of belt-type continuously variable transmission |
摘要 |
A control method for a belt-type continuously variable transmission is provided for performing a belt slip control. The method includes oscillating hydraulic pressure and monitoring a phase difference calculated based on a multiplication value of an oscillation component in an actual hydraulic pressure and an oscillation component in an actual variable speed ratio to estimate a belt slip condition. The method further includes controlling hydraulic pressure to maintain a predetermined belt slip condition by reducing the hydraulic pressure to be lower than a hydraulic pressure in a normal control time based on an estimation, and limiting an input torque-change rate in which an input torque to the belt-type continuously variable transmission changes in an increasing direction until the hydraulic pressure rises to a hydraulic pressure in which the input torque is not excessive relative to a belt clamp force. |
申请公布号 |
US9212742(B2) |
申请公布日期 |
2015.12.15 |
申请号 |
US200913266808 |
申请日期 |
2009.04.30 |
申请人 |
NISSAN MOTOR CO., LTD.;JATCO LTD |
发明人 |
Doihara Katsumi;Kodama Yoshihisa;Yoshikawa Yasuaki |
分类号 |
B60W10/107;F16H61/662;B60W10/06;B60W30/184 |
主分类号 |
B60W10/107 |
代理机构 |
Foley & Lardner LLP |
代理人 |
Foley & Lardner LLP |
主权项 |
1. A control method for a belt-type continuously variable transmission configured to perform a belt slip control in which a belt slip condition among a primary pulley, a secondary pulley, and a belt is controlled by a hydraulic pressure, the belt slip control of the control method comprising:
oscillating the hydraulic pressure and monitoring a phase difference calculated on the basis of a multiplication value of an oscillation component included in an actual hydraulic pressure and an oscillation component included in an actual variable speed ratio to estimate the belt slip condition; controlling the hydraulic pressure to maintain a predetermined belt slip condition by reducing the hydraulic pressure to be lower than a hydraulic pressure in a time of a normal control, the hydraulic pressure being controlled based on the estimation; and limiting an input torque-change rate in which an input torque to the belt-type continuously variable transmission changes in an increasing direction, the rate being limited until the hydraulic pressure rises to a hydraulic pressure in which the input torque to the belt-type continuously variable transmission is not excessive relative to a belt clamp force, the limitation being performed for a predetermined period from an initiation of return to the normal control, when returning to the normal control by an increment in the input torque to the belt-type continuously variable transmission. |
地址 |
Yokohama-Shi JP |