Volkswagen and Skoda’s Active Cylinder Technology (ACT) is an advanced fuel-saving system that dynamically manages engine cylinders to improve fuel efficiency. Here's how it works:
1. Cylinder Deactivation
ACT temporarily deactivates specific cylinders when the vehicle is under low-load conditions, such as cruising at constant speeds or driving downhill. In most applications, ACT can deactivate two out of four cylinders in a four-cylinder engine.
2. How It Works
Sensors and Software: The system continuously monitors driving conditions through sensors and an electronic control unit (ECU).
Valve and Fuel Injection Control: When the conditions are right, the system stops injecting fuel into certain cylinders and closes the intake and exhaust valves of those cylinders. This prevents air from entering or exiting the cylinder, effectively reducing the workload on the engine.
Seamless Transition: The deactivation and reactivation of cylinders happen seamlessly, so the driver usually doesn’t notice the change.
3. When It’s Used
ACT typically activates during steady-state driving, such as:
Cruising on highways at moderate speeds
Low-load situations, like driving downhill or coasting When more power is needed, such as during acceleration, all cylinders are reactivated immediately.
4. Fuel Efficiency and Emissions Benefits
Reduced Fuel Consumption: By temporarily disabling cylinders, the engine burns less fuel when full power isn’t required, improving overall fuel efficiency by around 10-20%, depending on driving conditions.
Lower CO2 Emissions: Reducing fuel consumption also lowers CO2 emissions, helping manufacturers meet stricter emissions regulations
5. Engines Featuring ACT
Volkswagen and Skoda have used ACT in various models equipped with turbocharged petrol engines, especially the 1.4 TSI and 1.5 TSI engines. These engines are known for offering a good balance of performance and efficiency due to the ACT system.
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