Have you ever wondered how the variable cylinder management system works? Let me explain it to you…
The VCM system includes the following components:
- i-VTEC Valve
- Throttle
- Intake and Exhaust Valves
- Oil Pressure
- Active Control Engine Mount System
The variable cylinder management system uses the i-VTEC valve (intelligent Variable Valve Timing and Lift Electronic Control system) to vary the opening of the intake and exhaust valves on the three rear cylinders of a Honda V6 engine under certain conditions. The opening of the i-VTEC valve depends on OIL PRESSURE and engine speed. The system operates shortly after cruising speed is reached. When the system activates, all valves remain closed in the three rear cylinders. The valves do not open to compress the air inside the cylinder, which reduces engine friction drag and significantly increases mileage. During deceleration (throttle closed), fuel is also momentarily cut off. As soon as the throttle is opened again, the i-VTEC valve restores full operation, and fuel is returned to all cylinders for maximum performance.
The ACTIVE CONTROL ENGINE MOUNT SYSTEM eliminates any engine vibration resulting from the loss of the three cylinders by using fluid-filled engine mounts that absorb vibrations, as well as front and rear engine mounts that contain an actuator that produces counter-vibration or reverse vibration to cancel out engine vibration at all times.
And that is how the variable cylinder management system works.