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Technical Paper

Development of New CVT for Compact Car

2015-04-14
2015-01-1091
A new CVT that is lighter in weight and more highly efficient than the previous CVT for use in compact vehicles has been developed and used in the 2014 model year FIT. The allowable torque capacity was expanded to that of the 1.8-L engine class, making this CVT usable in a greater number of vehicle models. The ratio coverage was also expanded and the transfer efficiency was increased to enhance fuel economy and drivability. Integration of hydraulic control system functional parts and reduction in the number of case component parts were carried out as structural modifications. Pulley side pressures were also reduced by the use of new CVT fluid so that the pulley could be made more compact and lighter in weight. Enhancements were made in CVT shift control, providing more acceleration considered from the driver's acceleration demand and more linearity between vehicle speed and engine speed than in previous models.
Technical Paper

Development of High-Efficiency New CVT for Midsize Vehicle

2013-04-08
2013-01-0365
A CVT for midsize vehicles was developed that simultaneously achieves high levels of fuel efficiency performance and driving enjoyment, and marketability enabling deployment to global markets, and support for high-torque direct injection engines. This was done by modifying the CVT for 2.4 L-class vehicles sold in Japan, expanding the ratio range, using CVTF with a high friction-coefficient that simultaneously realizes both high efficiency and a high transmission capacity. This enabled achievement of an overall length of 386.5 mm, total weight of 96.1 kg, and maximum transmission torque of 270 Nm, and also enhanced fuel efficiency by approximately 10% (EAP fuel economy label) compared to the 2008 model year Accord 5AT and approximately 5% (JC08) compared to the 2010 model year STEP WGN CVT. Thus, CVT performance was obtained that can simultaneously realize high levels of both fuel efficiency and driving enjoyment.
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