Speed ratio control of a parallel layout double cavity half-toroidal CVT for four-wheel drive
✍ Scribed by Hirohisa Tanaka
- Publisher
- Elsevier Science
- Year
- 2002
- Tongue
- English
- Weight
- 267 KB
- Volume
- 23
- Category
- Article
- ISSN
- 0389-4304
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✦ Synopsis
A double cavity half-toroidal CVT has two variators, which gives a hint of a new four-wheel drive without a center differential gear unit by applying each of them to drive front and rear drive shafts independently. Torque re-circulation at cornering or different tire radii between front and rear tire is avoided by compensating the speed ratio of variator. The controller adjusts the attitude angle of power roller of the front variator against the rear by measuring the steering angle at cornering. This paper describes the speed ratio control system of the 4WD-CVT with speed ratio range of 1 : 8.7 and test results of vehicle motion mounted on a 3.2L RV.