Development of Ratio Control System for Toyota's New Continuously Variable Transmission

Kunio Hattori; Shinya Toyoda; Daisuke Inoue; Yuya Shimozato

doi:10.4271/2013-01-0367

Toyota has developed a new belt-type continuously variable transmission (CVT) for 1.5-liter compact vehicles. To improve both driveability and fuel economy over previous CVTs, pressure management was adopted as the shift control method. The new shift control system was designed using a model-based control method which uses a two-degree-of-freedom system composed of feedback and feedforward controls. Smooth shifting in all the target shift speed regions was realized by combining a feedback loop that considers the output limit of the pulley thrust into the feedforward controller. Furthermore, shift response was improved while maintaining or even improving stability. This paper describes the details of this shift control system.

Standards

SAE Mobilus®

Publications

News

Events

Professional Development

A World in Motion (PreK-12)

Participate with SAE

SAE Membership

Donate

Development of Ratio Control System for Toyota's New Continuously Variable Transmission 2013-01-0367

SAE MOBILUS