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

Journal Article
2013-01-0367
ISSN: 1946-4614, e-ISSN: 1946-4622
Published April 08, 2013 by SAE International in United States
Development of Ratio Control System for Toyota's New Continuously Variable Transmission
Sector:
Citation: Hattori, K., Toyoda, S., Inoue, D., and Shimozato, Y., "Development of Ratio Control System for Toyota's New Continuously Variable Transmission," SAE Int. J. Passeng. Cars – Electron. Electr. Syst. 6(1):144-151, 2013, https://doi.org/10.4271/2013-01-0367.
Language: English

Abstract:

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.