What is the function of valve timing control?

The valve timing control function of Pacific Auto Network is to adjust the intake and exhaust volume, as well as the opening and closing time and angle of the valve according to the engine operation, so as to optimize the intake volume and improve the combustion efficiency.

The function of valve timing control valve is to adjust the intake and exhaust volume, valve opening and closing time and angle according to the engine operation, so as to optimize the intake volume and improve the combustion efficiency.

When the vvt solenoid valve is broken, there will be phenomena such as weak acceleration, failure code reporting and increased fuel consumption. In severe cases, it will lead to failure to start. Vvt solenoid valve is a variable valve timing solenoid valve.

The valve timing control valve consists of an oil pressure control valve, an intake cam toothed disc, a crankshaft sensor, a cam position sensor, an oil pump and an engine electronic control unit. The toothed disc of the intake cam comprises an external gear driven by a timing belt, an internal gear connected with the intake cam and a control piston which can move between the internal gear and the external gear.

When the piston moves, the spiral gear on the piston will change the position of the external gear, thus changing the timing effect. The displacement of the piston is determined by the oil pressure control valve, which is an electronic control valve, and its oil pressure is controlled by the oil pump. When the computer receives input signals, such as engine speed, air intake, throttle position and engine temperature, it determines the operation of the oil pressure control valve.

The computer will also use the cam position sensor and crankshaft position sensor to determine the actual valve timing of the intake cam. When the engine is started or shut down, the position of the oil pressure control valve changes, which makes the intake cam timing in a delayed state.

(Photo/Text/Photo: Pacific Auto Network Q&A called Beast)