Drivetrains: Challenging the design philosophy

A researcher from the Southwest Research Institute focuses on one of the most immediate and dramatic changes of powertrain design: the introduction of CVTs.

The automotive drivetrain, after evolving little over the past 75 years, is undergoing a rapid and unprecedented metamorphosis. In light of the required reduction in fuel consumption and emissions levels set by legislation and reinforced by the reality of diminishing worldwide oil supplies, this accelerated transformation likely will continue for the next 20 years. Highlighting this transformation is the introduction of the continuously variable transmission (CVT), the change to 42-V electric systems, the introduction of hybrid-electric systems, and the electrification of many mechanical systems.

According to researchers from the Southwest Research Institute, to fully realize the benefits of a CVT-configured powertrain, automotive engineers need to design engines with dramatically different operating and physical characteristics than those currently powering production vehicles. For the consumer, the benefits should include engines that are simpler and operate at higher efficiencies, but at higher average load and lower speed. These engines should produce fewer emissions, have a longer operating life, and cost less to make.