Automotive Continuously variable of Transmission (mechanics)

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The engine generates its peak torque and power inconsistently throughout the rev range, creating a torque band and a power band. Typically, optimum torque is necessary for vehicle acceleration or low-speed traveling, while maximum power is essential at high speeds. Thus, a mechanism is needed to alter the engine's output, enabling it to provide high torque at low speeds and maintain operation within its limits during highway cruising. This is where transmissions excel, as they perform this transformation.