What is engine DVVT?
3 Answers
Engine DVVT refers to the intake system of the engine being equipped with variable valve timing technology for both intake and exhaust. Engines adopting this technology are more efficient, energy-saving, and environmentally friendly compared to those using other variable valve timing technologies currently available. DVVT technology can increase power by 10% while reducing fuel consumption by 5%, with exhaust emissions meeting the National IV standard. By controlling the opening and closing timing of the intake and exhaust valves, DVVT technology regulates the air-fuel mixture ratio, achieving an optimal air-fuel ratio, improving combustion efficiency, and significantly enhancing idle stability for better comfort.
When I first got into car engines, I was curious about DVVT. It stands for Dual Variable Valve Timing technology, which differs from standard VVT that only adjusts the intake. DVVT can simultaneously alter the opening and closing timing of both intake and exhaust valves. In daily driving, I noticed the engine responds more swiftly—low-speed starts feel less sluggish, while high-speed acceleration becomes more powerful and saves about 10% on fuel. I've driven a Toyota equipped with DVVT, and it made climbing mountain roads much easier, with the fuel gauge showing an extra few dozen kilometers per tank. Maintenance-wise, I haven’t encountered any issues, though I do check for sensor dust more often during car washes. Overall, it enhances driving smoothness and fuel efficiency, making it ideal for family cars focused on long-distance travel with low fuel consumption.
As someone with some knowledge about engines, DVVT stands for Dual Variable Valve Timing. Its core principle is to dynamically adjust valve timing based on engine speed: delaying intake valve closing at low speeds for fuel efficiency, and advancing exhaust valve opening at high speeds for improved power output. This technology is achieved through ECU-controlled camshaft phasing systems, making it more intelligent than single VVT by optimizing air-fuel mixture and reducing waste. In practical terms, it can improve fuel efficiency by about 8% while reducing emissions. Modern vehicles like Honda's i-VTEC employ similar principles, delivering both eco-friendly and smooth daily driving with barely noticeable gearshift jerks.
