US 11,725,547 B2
Valve opening and closing timing control apparatus device
Shuhei Sugiyama, Kariya (JP)
Assigned to AISIN CORPORATION, Aichi (JP)
Filed by AISIN CORPORATION, Aichi (JP)
Filed on Mar. 22, 2022, as Appl. No. 17/701,202.
Claims priority of application No. 2021-065217 (JP), filed on Apr. 7, 2021.
Prior Publication US 2022/0325642 A1, Oct. 13, 2022
Int. Cl. F01L 1/352 (2006.01); F02D 13/02 (2006.01); F01L 13/00 (2006.01)
CPC F01L 1/352 (2013.01) [F01L 2013/103 (2013.01); F01L 2013/111 (2013.01); F01L 2201/00 (2013.01); F01L 2800/03 (2013.01); F01L 2800/14 (2013.01); F01L 2820/032 (2013.01); F01L 2820/041 (2013.01); F02D 2013/0292 (2013.01)] 5 Claims
OG exemplary drawing
 
1. A valve opening and closing timing control device, comprising:
a driving-side rotating body configured to rotate in synchronization with a crankshaft of an internal combustion engine;
a driven-side rotating body configured to rotate integrally with a camshaft of the internal combustion engine so as to open and close a valve in a combustion chamber of the internal combustion engine, the driven-side rotating body coaxially aligned with a rotation shaft core of the driving-side rotating body;
a stopper defining a mechanical limit of a displacement region of a relative rotation phase between the driving-side rotating body and the driven-side rotating body;
a three-phase energization electric motor;
a phase control mechanism including a gear-type transmission structure, the phase control mechanism configured to be driven via the electric motor so as to set the relative rotation phase by controlling a rotation speed of the electric motor relative to a rotation speed of the driving-side rotating body;
a phase sensor configured to detect the relative rotation phase as an actual phase; and
a control unit configured to control the electric motor so as to displace the actual phase detected by the phase sensor in a direction toward a target phase, wherein:
a limit phase at which the stopper reaches an abutting state is set in advance when rotation of the electric motor is stopped during operation of the internal combustion engine,
upon executing a stop control of stopping the internal combustion engine, except when the actual phase is already the limit phase, the control unit executes a braking control of limiting the rotation of the electric motor, via control of an electric current supplied to the electric motor, and
in the braking control, the control of the electric current supplied to the electric motor is performed by energizing only one of three phases of the electric motor.