Although the variable valve timing technology is slightly different in terms of various manufacturers, the way of implementation is similar. Taking Toyota's VVT-i technology as an example, its working principle is: The system is coordinated and controlled by the ECU, and the sensors of each part of the engine report the operation to the ECU in real time. Since the valve optimal timing parameter is stored in the ECU, the ECU will adjust the timing mechanism at any time to change the valve opening and closing time, either early, or delayed, or remain unchanged.
Simply put, the VVT system adjusts the angle of the camshaft within a certain range by adding a hydraulic mechanism to the drive end of the camshaft, which is equivalent to adjusting the opening and closing timing of the valve.
At present, variable valve timing technology has become the standard configuration of today's engines. In order to further tap the potential of traditional internal combustion engines, engineers have developed variable valve lift technology based on this, which can control the valve opening angle. When the two are effectively combined, the engine provides higher efficiency of intake and exhaust in various working conditions and speeds. Further increase power and reduce fuel consumption.