They say the key to a successful relationship is compromise. However, when it comes to the relationship of performance and fuel economy, accessory drive engineers and designers have had to compromise for far too long. Increasing performance and fuel economy by optimizing system operation is now possible with NuVinci® CVP technology.
Accessory drives utilizing NuVinci CVP technology eliminate the compromise of fixed ratio accessory drives by de-coupling accessory RPM from engine RPM. Now the accessory will run at the optimum demand speed regardless of engine speed. With NuVinci technology, the drive can also be boosted to provide full-rated accessory output regardless of engine speed – even at engine idle – or accessory speed can be reduced when demand is low, enabling improved fuel economy and performance.
NuVinci optimized accessory drives are completely silent in operation. Their highly flexible packaging enables use of existing beltlines (with no extra belts needed) and their stable, predictable shift controls (using simple electric or low pressure hydraulic actuators) ease implementation of simple, yet innovative powertrain tuning.
More economy. More performance. No compromise.
At the heart of every NuVinci accessory drive is Fallbrook’s award-winning NuVinci continuously variable planetary (CVP) transmission technology. The NuVinci CVP is a new class of continuously variable transmission (CVT) technology that acts as a power management system to control the speed and optimize the performance of the accessory drive. Unlike conventional CVTs, the NuVinci CVP uses a set of rotating and tilting balls positioned between the input and output components of the transmission that tilt to vary the speed of the transmission. Tilting the balls changes their contact diameters and varies the speed ratio. As a result, the NuVinci CVP offers a seamless and continuous transition to any ratio within its range.
The NuVinci accessory drive enables control of output speed, independent of engine speed. At engine idle, output speeds may be increased providing more performance from the accessory. At higher engine speeds (such as accelerating from a stop or cruising), accessory speeds may be reduced, saving energy. The NuVinci CVP also shifts quickly, helping to smooth out transients.
The accessory drive receives power from the belt, transfers it to one traction ring, through the planet balls, and out of the other traction ring. Tilting the balls provides a smooth ratio transition from overdrive to underdrive. In overdrive, the NuVinci accessory drive provides high accessory speeds at engine idle. In underdrive, it keeps the accessory from over-speeding at high engine speeds.
Accessory Drive Applications
Accessory drives that include NuVinci CVP technology can provide numerous options for cars, light trucks, buses, trucks, and a variety of commercial vehicles. Current applications include:
- AC Compressor
Improve AC performance and fuel economy at idle without increasing compressor size: “Passenger comfort and fuel efficiency - improved”
Produce rated power at idle and increase fuel economy by delivering ideal alternator speed all the time: “Electrical power and fuel economy - optimized”
Optimally control all belt accessories and reduce energy consumption: “Accessory control and energy efficiency - enhanced”
- Fan Drive
Optimize cooling performance by managing fan speed independent of engine speed: “System component cooling - as needed”
- Power Steering
Operate PS pump at optimum speed and increase performance and fuel efficiency
More boost and launch power offers opportunities to downsize engine without sacrificing performance: “Engine power and performance - achieved efficiently”
- Water Pump
Improve the engine cooling system with a NuVinci water pump drive: “Engine cooling - optimized”
Accessory Drives News & Events Tabs
To learn more about how the revolutionary NuVinci® CVP is redefining mechanical transmission, please take a look at one of these recent press releases.
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