Valve Deactivation Solenoid: Description and Operation
SOLENOID-MDSDESCRIPTION
The Multi Displacement System selectively deactivates cylinders 1,4,6, and 7, to improve fuel economy. It has two modes of operation :
- 8 cylinders for acceleration and heavy loads.
- 4 cylinders for cruising and city traffic.
The main components of the Multi Displacement System are
- Unique MDS camshaft.
- Deactivating roller tappets.
- 4 control valves/solenoids.
- control valve/solenoid wiring harness.
- oil temp sensor.
OPERATION
Cylinder Deactivation
- Trap an exhaust charge
- Normal combustion event
- Don't open exhaust valve
- Don't open intake valve
- Piston is an air spring
- Cylinders deactivated in firing sequence
Cylinder Reactivation
- Empty the cylinder
- Open exhaust valve
- Open intake valve
- Normal combustion event
- Cylinders reactivated in firing sequence