Variable valve lift (VVL) is an automotive piston engine technology which varies the height a valve opens in order to improve performance, fuel economy or emissions. There are two main types of VVL: discrete, which employs fixed valve lift amounts, and continuous, which is …

VVL and VVT systems work together to optimize engine performance by adjusting both valve timing and lift. VVT alters the timing of valve openings and closings based on engine speed and load, while VVL adjusts the height of valve lift.

2015年9月11日 · DCA engineers say a combination of 2-step variable valve lift (VVL), upgraded variable valve timing, improved intake ports and a new intake manifold will make it happen. The Pentastar V6 carries over the basic architecture and dimensions but …

到了80年代末，随着ECU+电喷车型的普及，一项一直以来只是设想的技术终于开始被本田大规模应用在车上，那就是VVT和VVL技术。 说起这项技术，我首先给大家降为解释一下其原理吧。 首先，我们都知道4冲程发动机包含吸气压缩做功排气4个冲程，这其中曲轴和活塞的运行过程是恒定不变的（当然现在也又可以变的了，以后有机会再说这一块)。 而进气排气用的气门，无论是挺杆，单顶置凸轮轴还是双顶置凸轮轴，都是由曲轴驱动的，这虽然确保了进排气阀门和发动机匀 …

Nissan Ecology Oriented Variable Valve Lift and Timing (commonly known as VVL & VVT) is an automobile variable valve timing technology developed by Nissan. VVL varies the duration, and lift of valves by using hydraulic pressure switch between two different sets of camshaft lobes.

2017年1月11日 · Variable valve lift (VVL) and variable valve timing (VVT) are two of the most popular ones. These systems sound pretty similar, but what do they actually do? Luckily, there's a real engineer here...

Variable valve lift is used to enhance performance depending on the RPM and load, while variable valve timing is typically used for emissions control (lowering combustion temperatures...

2015年7月14日 · How VVT Works? The Variable Valve Timing system further optimizes the timing of opening and closing the valves for multiple engine speeds. The first-generation VVT design uses two-step variation which optimises the engine for two different engine speeds.

2025年1月4日 · What Is VVL? VVL technology allows the engine control unit (ECU) to adjust the valve lift based on the engine's operating conditions. The ECU sends commands to solenoids, which regulate oil pressure to alter the valve lift. By adjusting the valve opening size, VVL achieves an optimal air-fuel ratio for the engine.

2017年1月12日 · Variable valve lift (VVL) and variable valve timing (VVT) are two of the most popular ones. These systems sound pretty similar, but what do they actually do? Luckily, there's a real engineer here...