To enable start suitable for an engine temperature.
A main lock mechanism 16 locks a rotating phase by fitting a main lock member 160 to a main lock hole 162 at a main lock phase Pm for closing an intake valve 9 at later timing than arrival of a piston 8 at a bottom dead center. An auxiliary lock mechanism 17 locks the rotating phase by fitting an auxiliary lock member 170 to an auxiliary lock hole 172 at an auxiliary lock phase Ps advancing from the main lock phase Pm. A lock control mechanism 18 for controlling the state of the main lock member 160 in accordance with magnetic permeability M of a temperature dependent temperature-sensitive magnetic body 184 allows fitting of the main lock member 160 to the main lock hole 162 at the main lock phase Pm in a warm stop state while a temperature of a stopped internal combustion engine reaches a set temperature Ts or higher, and releases the fitting of the lock member 160 to the main lock hole 162 at the main lock phase Pm in a cold stop state after the temperature reaches a temperature lower than the set temperature Ts.
OE SHUHEI
OKA KUNIAKI
YASUKI YUSUKE
SASAKI TAKESHI
TANAKA TAKEHIRO
DENSO CORP
Taihei Nonobe
Takanori Kubo