Auto Spare Parts CVVT ASSY 24350-26800

CVVT Assembly (Continuously Variable Valve Timing System) Introduction
Main Functions
The core role of CVVT (Continuously Variable Valve Timing) is to dynamically adjust the opening and closing timing of the engine's intake (and sometimes exhaust) valves. By optimizing valve timing according to engine speed, load, and other operating conditions, it enhances combustion efficiency, balancing power output, fuel economy, and emissions.
Working Principle
1. Key Components: Include sensors (monitoring speed, load, coolant temperature, etc.), a control unit (ECU, Electronic Control Unit), and an actuator (such as a variable phaser driven by hydraulic or electromagnetic force).
2. Adjustment Logic:
Low Speed/Low Load: Intake valves close later to reduce residual exhaust gas in the cylinder, increasing fresh air intake and enhancing torque (improving low-speed acceleration and climbing ability).
High Speed/High Load: Intake valves close earlier to utilize air flow inertia, maximizing air intake for stronger horsepower (enabling smoother high-speed overtaking).
Idle/Cruise: Valve timing prioritizes stable combustion to reduce fuel consumption and vibration.
Role in Vehicles
1. Enhanced Performance:
Boosts low-speed torque for brisk acceleration and high-speed horsepower for strong overtaking ability.
2. Better Fuel Efficiency:
Precisely controls air intake to minimize "wasted suction" and energy loss, improving fuel economy by 5%-10% (especially in stop-and-go urban driving).
3. Lower Emissions:
Optimizes combustion to reduce unburned harmful substances like nitrogen oxides (NOx) and hydrocarbons (HC).
4. Smoother Operation:
Reduces shocks from valve opening/closing, ensuring quieter, smoother engine performance with less vibration.
CVVT acts as the engine’s "breathing regulator", adjusting the "timing of its breaths" in real time based on driving needs to deliver more power, better fuel efficiency, and a greener output.