Patent
Line pressure control apparatus for belt-drive continuously variable transmission
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TLDR
In this article, a shift actuator, such as a step motor, is brought into a control position corresponding to a target transmission ratio, which is calculated based on a theoretical transmission ratio based on engine and vehicle operating conditions taking account of a hardware response delay and a disturbance.Abstract:
In a line pressure control apparatus of a belt-drive CVT, a shift is achieved by varying V-groove widths of primary and secondary pulleys by a differential pressure between primary and secondary pulley pressures, originating from line pressure. The differential pressure is created by bringing a shift actuator, such as a step motor, into a control position corresponding to a target transmission ratio. The target transmission ratio is calculated based on a theoretical transmission ratio based on engine-and-vehicle operating conditions, taking account of a hardware response delay and a disturbance. The target transmission ratio is converted into a reference-model operative position, corresponding to a reference-model number-of-steps of the shift actuator. An actual transmission ratio is converted into an actual-transmission-ratio related operative position. Line pressure is corrected in a manner so as to reduce the positional deviation between the reference-model operative position and the actual-transmission-ratio related operative position.read more
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References
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Patent
Cam loaded continuously variable transmission
TL;DR: In this paper, a continuously variable transmission utilizes a cam loading device with a hydraulically controlled CVT of the metal V-belt type, which applies an axial loading force to the pulley flanges in proportion to the output torque.
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