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What is VVT-iE technology?

1 Answers

StAdeline

07/30/25 7:26am

VVT-iE is an electrically driven intelligent variable valve timing system. The motor-controlled VVT-iE offers faster response, more precise control, and enables stepless adjustment. Below are the specific details about VVT-iE: Composition of VVT-iE: The VVT-iE system consists of a camshaft control motor assembly, crankshaft position sensor, camshaft position sensor, and VVT sensor, among others. The camshaft control motor assembly includes the camshaft control motor, cycloidal reduction mechanism, spiral disk, connecting mechanism, and timing chain sprocket. Working Principle of VVT-iE: To advance the timing, the camshaft control motor rotates faster than the camshaft. The spiral disk is driven by the motor via the reduction mechanism, causing the connecting control pin to slide inward along the spiral disk's groove, which rotates the camshaft disk in the advancing direction via the connecting mechanism. To retard the timing, the camshaft control motor rotates slower than the camshaft. The spiral disk is driven by the motor via the reduction mechanism, causing the connecting control pin to slide outward along the spiral disk's groove, which rotates the camshaft disk in the retarding direction via the connecting mechanism. When the motor speed matches the camshaft speed, the spiral disk does not rotate, the connecting control pin remains stationary, and the valve timing remains unchanged. Advantages of the VVT-iE System: Traditional hydraulic VVT-i systems do not operate under low temperatures or low speeds due to insufficient oil pressure and poor lubrication. Compared to hydraulic VVT-i systems, the motor-driven VVT-iE system expands the operational range. VVT-iE can adjust intake and exhaust valve timing across a wider range of engine speeds and coolant temperatures, improving intake and exhaust efficiency, enhancing idle stability and low-speed smoothness, increasing engine power and torque, reducing fuel consumption under partial loads, and improving exhaust emissions.

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