First of all, this kind of thing is the abbreviation of variable valve, and each company names its technology differently. VTC is a computer that uses signals from various sensors to continuously change and optimize the phase of the camshaft [that is, rotate at a certain angle] according to the engine operating conditions to adjust the valve timing. The latter is less common and is only seen at the end of the winning line. But I-VTEC (or VTEC) is Honda's famous "variable valve" and Toyota's VVT-I. In addition, according to the investigation: outside the automotive industry, IVTC also has: IVTC-can effectively eliminate the "Interlace" of the film )" phenomenon