영어 
The variable valve timing (VVT) system optimizes engine performance and improves fuel efficiency by adjusting the phase of the camshaft. The main categories are as follows:
Mechanical VVT: driven by centrifugal force or oil pressure, simple and durable, mostly used in early engine designs.
Hydraulic VVT: uses engine oil pressure to adjust the camshaft angle, with high precision, and is the mainstream configuration.
Electronic VVT: controls phase changes through motors, responds quickly, and is widely used in high-performance models.
Comprehensive VVT: combines hydraulic and electronic control technologies, taking into account both precision and reliability.
These categories are widely used in different models to meet the needs of power output and environmental protection and energy saving.
Dec 12, 2024
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