Oil Control Valve (OCV) - Exhaust
Continuously Variable Valve Timing (CVVT) is an engine component that changes the phase angle of a cam according to the engine conditions (unlike conventional cams with a fixated phase angle, Continuously Variable Valve Timing (CVVT) is an engine component that changes the phase angle of a cam according to the engine conditions). The phase angle is determined and optimized by the Engine Control Module (ECM). The CVVT is controlled by a DC motor (intake) and engine oil pressure. The intake system is called electric Continuously Variable Valve Timing (e-CVVT). The e-CVVT optimizes valve overlap with a high-current DC motor by rotating a camshaft and thus controlling the phase angle of the intake cam in line with the engine operation conditions. The exhaust system consists of an Oil Control Valve (OCV) and a Cam phaser. The OCV controls the oil flow and its volume to the Cam phaser by manipulating an oil valve connected to a solenoid. The oil flow is determined by electric signals transmitted by the engine ECM according to the engine condition. The OCV also optimizes valve overlap by controlling the phase angle of the exhaust cam. The system enhances engine performance and fuel efficiency and decreases harmful chemicals in exhaust gases. Also, the e-CVVT allows control at ignition or during cold start.