What is the function of the car VVT valve?
2 Answers
The function of the car VVT valve is to adjust the amount of intake (exhaust) and the timing and angle of valve opening and closing. Here are the relevant details: 1. VVT: VVT stands for Variable Valve Timing, referring to the variable timing valve system. This is a technology used in automotive piston engines. VVT technology can adjust the overlap time and timing of the engine's intake and exhaust systems, reducing fuel consumption and improving efficiency. The advantages are fuel efficiency and a high power-to-weight ratio; the disadvantage is insufficient torque at mid-range speeds. 2. Principle: The principle of the engine's variable valve timing technology is to adjust the intake (exhaust) amount, valve opening and closing time, and angle based on the engine's operating conditions, so that the amount of air entering reaches the optimal value, improving combustion efficiency.
I find the VVT valve quite fascinating. Having disassembled many engines during repairs, I discovered it's essentially an oil control valve that adjusts valve timing by altering the camshaft angle. The most noticeable effect occurs when climbing hills or overtaking - stepping on the accelerator makes the engine inhale more air promptly, delivering smoother power output as if the car suddenly comes alive. During low-speed urban driving, it delays valve opening to reduce fuel injection, naturally improving fuel economy. When this component fails, the car struggles like an asthma patient - sluggish acceleration accompanied by excessive fuel consumption. Remember to change engine oil regularly during maintenance, since it operates using oil pressure.
