What are the functions and characteristics of Honda VVT-i?

VVT-i (Variable Valve Timing-intelligent) is Toyota’s registered engine variable valve technology, that is, an intelligent variable valve timing system. Its biggest feature is that it can control the intake camshaft according to the state of the engine, and optimize the valve timing by adjusting the camshaft angle to obtain the best valve timing, thereby improving torque in all speed ranges, and can improve fuel economy to a certain extent, effectively improve the power and performance of the car, and reduce fuel consumption and exhaust emissions.
VVT-i consists of sensors, electronic control units, hydraulic control valves and controllers. According to the different installation locations of the controller, it is divided into two types: one is installed on the exhaust camshaft, called vane-type VVT-i, such as Toyota Grand VVT; the other is installed on the intake camshaft, called spiral groove VVT-i, Lexus 400, 430 and other high-end cars use this form.
The ECM of Toyota’s VVT-i engine can automatically search for the best valve timing corresponding to the engine speed, intake volume, throttle position and coolant temperature under various driving conditions, control the camshaft timing hydraulic control valve, and sense the actual valve timing through the signals of various sensors, and then perform feedback control to compensate for system errors to achieve the best valve timing position, thereby effectively improving the power and performance of the car and minimizing fuel consumption and exhaust emissions.
Engine variable valve timing technology (VariavleValve Timing, VVT) is one of the new technologies that has been gradually applied to modern cars in recent years. The engine uses variable valve timing technology to increase the intake charge, increase the charge coefficient, and further improve the engine’s torque and power.