Variable Camshaft Timing Operation
When the engine is running, the compression and expansion of the valve springs causes momentary increases and decreases in the torque acting on the camshafts. These momentary changes of torque are sensed in the Variable Camshaft Timing (VCT) actuators and used to change the camshaft timing.
Camshaft Torsional Energy (For A Single Valve Event)
| Item | Description |
|---|---|
| A | Camshaft torque |
| B | Camshaft rotation - Degrees |
| C | Valve opening |
| D | Peak lift |
| E | Valve closing |
| 1 | 1000 Revolutions Per Minute (RPM) |
| 2 | 4000 RPM |
| 3 | 7000 RPM |
| 4 | Inertia effects from valve train rotating components |
| 5 | Force caused by valve spring |
| 6 | Bias torque from friction |