Pic. 2.49. Diagram of the VVT-i system
VVT-i system (pic. 2.49) designed to control the intake camshaft in a wide range of 50° (angles of rotation of the crankshaft), to ensure that the valve opening or closing timing is optimally matched to engine operating conditions, thus increasing torque in all speed and fuel efficiency ranges and reducing exhaust emissions. The actual intake valve opening or closing timing is determined by the camshaft position sensor for constant comparison with the target valve opening or closing timing and the corresponding control action is generated.