Camshaft adjustment system for flexibly starting an internal combustion engine, and method for operating a drivetrain

A camshaft adjustment system, comprising:

• a hydraulic camshaft adjuster having at least one working chamber formed between a stator and a rotor, the rotor configured to be rotatable relative to the stator, and
• at least one of the at least one working chamber is divided into a first sub-chamber and a second sub-chamber, and the first sub-chamber and the second sub-chamber are fluidly connected with a control valve controllable via a first actuator, such that:
• i) when the first sub-chamber undergoes a volume increase, the rotor is displaced into a late position relative to the stator, and ii) when the second sub-chamber undergoes a volume increase, the rotor is displaced into an early position relative to the stator, and
• a second actuator actuated independently of the first actuator, the second actuator electronically controlled and having a ram configured to displace a locking pin of a late-locking device of the hydraulic camshaft adjuster so as to release the hydraulic camshaft adjuster from a locked late position when the hydraulic camshaft adjuster is in an operating state.