What is an Electric Variable Transmission?

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Electric Variable Transmission:

The Electric Variable Transmission (EVT) combines a transmission with an electrical motor to produce the illusion of one CVT. Within the common implementation, an internal-combustion engine is connected to a standard transmission. That is successively connected to a cogwheel system’s planet carrier. An electrical motor/generator is connected to the central “sun” gear. That is generally un-driven in typical epicyclic systems. Also, both sources of power are often fed into the transmission’s output at an identical time. Splitting power between them. In common examples, between one-quarter and half the engine’s power is fed into the gear.

Looking at the implementation, the transmission ahead of the epicyclic system. That could also be greatly simplified or eliminated. EVTs are capable of continuously modulating output/input speed ratios like mechanical CVTs. Yet offer the distinct advantage of having the ability to also apply power from two different sources to 1 output. Still potentially reducing overall complexity dramatically.


Typical Implementations:

In typical implementations, the gear ratio of the transmission and epicyclic system is ready for the ratio of the common driving conditions. Say highway speed for a car, or city speeds for a bus. When the motive force presses on the gas, the associated electronics interpret the pedal position and immediately set the ICE to the RPM. That gives the simplest ratio for that setting. Because the gear ratio is often set removed from the utmost torque point. This set-up would normally lead to very poor acceleration.

Unlike gasoline engines, electric motors offer efficient torque across a large selection of RPM. And are especially effective at low settings. According to this, the internal-combustion engine is inefficient. By varying the electrical load or supply on the motor attached to the cogwheel. Additional torque will be provided to form up for the low torque output from the engine. Because the vehicle accelerates. The ability to the motor is reduced and eventually ended. Providing the illusion of a CVT.


Toyota’s Hybrid Synergy Drive:

The canonical example of the EVT is Toyota’s Hybrid Synergy Drive. This implementation has no conventional transmission. And also the cogwheel always receives 28% of the torque from the engine. This power is often wont to operate any electrical loads within the vehicle. Recharging the batteries, powering the entertainment system. Or running the air con system. Any residual power is then fed into a second motor that powers the output of the drivetrain directly.

At highway speeds, this extra generator/motor pathway is a smaller amount efficient than simply powering the wheels directly. However, during acceleration, the electrical path is way more efficient than an engine operating to this point from its torque point. GM uses the same system within the Allison Bus hybrid powertrains and therefore the Tahoe and Yukon pick-up trucks. But these use a two-speed transmission before the epicyclic system. And therefore the gear receives near half the entire power.

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