IVT GEARBOX PDF

Currently, continuously variable transmission CVT is a topic of special interest as it allows the vehicle to have the engine working at its optimum regime either minimum or maximum power consumption as required remaining unaltered despite the changes in speed and the torque required on the drive wheels during operation. In these, in addition to acting on a control element, as in the rest of the kinematic type transmissions, the gear ratio also depends on the external conditions to which the transmission is subjected, that is, the transmission ratio is also determined by other variables such as the angular velocity of the input shaft and the load torque exerted on the output shaft. This paper reviews the most representative dynamic CVTs and torque converters TCs stating the basics of their functioning. The transmissions analyzed correspond to different patents, from one of the first [ 1 ] to the most recent [ 2 , 3 ] In addition, a brief description of each mechanism is given based on analytical and computational studies of the most interesting items, analyzing the advantages, disadvantages and deficiencies in the operation. Additionally, this review critically provides a warning regarding the pieces of information and working principles taken for granted. Subscribers can view annotate, and download all of SAE's content.

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Very similar to a continuously variable transmission, the new IVT performs continuous shifts to provide superior efficiency over automatic transmissions. It does this by modulating the pressure of the pulley system in the transmission, adjusting pressure based on the input of the driver and driving conditions. The pulley system it uses has a wide-ratio, directly correlating to a much broader ratio of operation than many other, similar transmission systems. This is what leads to an increase in fuel efficiency at the higher gear ratios yet an improvement in performance on the lower end.

The IVT also utilizes a chain belt rather than the much more common push belt, which is the first time this has ever been done in the compact car segment across the world. This once again helps to improve fuel efficiency. Finally, the IVT uses new Shift Control Strategy technology to lineup driver input, vehicle behavior and acceleration. This makes it more responsive and ultimately delivers a better driving experience on the road.

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(of mechanical transmissions, gearboxes)

Very similar to a continuously variable transmission, the new IVT performs continuous shifts to provide superior efficiency over automatic transmissions. It does this by modulating the pressure of the pulley system in the transmission, adjusting pressure based on the input of the driver and driving conditions. The pulley system it uses has a wide-ratio, directly correlating to a much broader ratio of operation than many other, similar transmission systems. This is what leads to an increase in fuel efficiency at the higher gear ratios yet an improvement in performance on the lower end. The IVT also utilizes a chain belt rather than the much more common push belt, which is the first time this has ever been done in the compact car segment across the world. This once again helps to improve fuel efficiency.

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What is an Intelligent Variable Transmission?

A continuously variable transmission CVT , also known as a shiftless transmission , stepless transmission, pulley transmission, or, in case of motorcycles , a "twist-and-go", is an automatic transmission that can change seamlessly through a continuous range of effective gear ratios. This contrasts with other mechanical transmissions that offer a fixed number of gear ratios. The flexibility of a CVT with suitable control may allow the input shaft to maintain a constant angular velocity even as the output speed varies. When power is more important than economy, the ratio of the CVT can be changed to allow the engine to turn at the RPM at which it produces greatest power. This is typically higher than the RPM that achieves peak efficiency.

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