Variable Camshaft Profile (Cps)
- High lift
- Low lift
To maintain low fuel consumption at different loads and engine speeds, there is a system for variable camshaft profile (CPS, Cam Profile Shifting) that can vary the duration and lift height of the valves on the intake camshaft.
Duration = part of the rotating camshaft's revolution that the camshaft acts on the valve.
The system is made up of hydraulic valve depressors where the Engine control module (ECM), via oil channels, can set the valve depressors in two positions, one low position and one high position.
At start and at low temperatures (oil temperature below +40 °C, the system is pressureless and thus in its low position (spring loaded).
To minimize stresses the Engine control module (ECM) pressurizes the depressors that are not loaded at the moment. For this, two cam profile solenoids are needed.
Cam profile solenoid 1 (CPS1) supplies cylinder 1, 2, and 4, and cam profile solenoid 2 (CPS2) supplies cylinder 3, 5, and 6 with pressurized oil.