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Hydraulic actuation

Hydraulic actuation is the most common method of variable valvetrain actuation. Engine oil pressure is regulated with an oil control valve (OCV).

Hydraulic Cylinder Deactivation:

  • Hydraulically actuated by oil pressure regulation with OCV (Oil Control Valve)
  • Pre-loading compliance spring enables staging of switching event on base circle
  • High speed switching capable
  • Precisely controlled mechanical gap/valve lift
  • Low weight, compact design
  • Flexible installation on intake or exhaust side
Mode Engine Speed (rpm) Oil Temperature (0C) OCV Signal Switching Port Pressure (bar) Latch Position
Standard Lift 0 to 7200 -40 to 150 De-Enegized 2 to 4 extended (engaged with inner arm)
CDA (No Lift) Idle to 3500 -20 Energized 20 Reactivated (disengaged with Inner arm)

Video gallery

Learn more about hydraulic actuation by watching this video.