Valve timing controller

A valve timing controller comprising:

• a driving side rotation member that synchronously rotates with a crankshaft of an internal combustion engine;
• a driven side rotation member that is contained in the driving side rotation member and rotates integrally with a cam shaft for opening and closing a valve of the internal combustion engine coaxially with a rotating axis of the driving side rotation member;
• an electromagnetic valve that displaces a relative rotation phase between the driving side rotation member and the driven side rotation member by supplying a working fluid to an advancing chamber and a retarding chamber defined between the driving side rotation member and the driven side rotation member;
• an intermediate locking mechanism that holds the relative rotation phase in an intermediate locking phase;
• a phase detection section that detects the relative rotation phase;
• and
• a control section that controls the electromagnetic valve based on a detection signal of the phase detection section,
• wherein the intermediate locking mechanism includes
• a first locking mechanism configured with a first lock member supported by one of the driving side rotation member and the driven side rotation member, a first lock recess portion formed on the other one of the driving side rotation member and the driven side rotation member, and a first biasing member that biases the first lock member toward the first lock recess portion, and
• a second locking mechanism configured with a second lock member supported by one of the driving side rotation member and the driven side rotation member, a second lock recess portion formed on the other one of the driving side rotation member and the driven side rotation member, and a second biasing member that biases the second lock member toward the second lock recess portion,
• the control section includes a lock releasing control section that executes a control for causing the electromagnetic valve to supply the working fluid to the one of the advancing chamber and the retarding chamber to retract the first lock member from the first lock recess portion against the biasing force of the first biasing member and displace the relative rotation phase in a first direction that becomes an advancing direction or a retarding direction from the intermediate locking phase, and after the phase detection section detects that the relative rotation phase exceeds a sequence region set from the intermediate locking phase to a predetermined phase in the first direction, executes a control for causing the electromagnetic valve to supply the working fluid to the other one of the advancing chamber and the retarding chamber to retract the second lock member from the second lock recess portion against a biasing force of the second biasing member, and
• the lock releasing control section includes a lock releasing determination section that determines whether or not a locked state of the intermediate locking mechanism is released based on a predetermined determination phase.