Valve opening and closing timing control device

Patent metadata

Field	Value
Publication number	US-11428172-B2
Application number	US-202117203887-A
Country	US
Kind code	B2
Filing date	Mar 17, 2021
Priority date	Jul 1, 2020
Publication date	Aug 30, 2022
Grant date	Aug 30, 2022

Abstract

A valve opening and closing timing control device includes: a driving-side rotating body that rotates synchronously with a crankshaft of an internal combustion engine around a rotating shaft core; a driven-side rotating body that rotates integrally with a valve opening and closing camshaft of the internal combustion engine around the same shaft core as the rotating shaft core; a gear mechanism that sets a relative rotation phase between the driving-side rotating body and the driven-side rotating body by displacement of a meshing position; a motor that enables displacement of the meshing position of the gear mechanism by rotating a rotating shaft; and a control unit that controls the drive of the motor. The control unit intermittently performs control to energize the motor for one phase for a predetermined time after the internal combustion engine is stopped.

First claim

The invention claimed is:

1. A valve opening and closing timing control device comprising:
a driving-side rotating body that rotates synchronously with a crankshaft of an internal combustion engine around a rotating shaft core;
a driven-side rotating body that rotates integrally with a valve opening and closing camshaft of the internal combustion engine around the same shaft core as the rotating shaft core;
a gear mechanism that sets a relative rotation phase between the driving-side rotating body and the driven-side rotating body by displacement of a meshing position;
a motor that enables displacement of the meshing position of the gear mechanism by rotating a rotating shaft; and
a control unit that controls the drive of the motor, wherein
the control unit intermittently performs control to energize the motor for one phase, with an interval between a one-phase energization and a next one-phase energization during which the motor is stopped, for a predetermined time after the internal combustion engine is stopped.

2. The valve opening and closing timing control device according to claim 1 , wherein
the control unit controls the interval between the one-phase energization and the next one-phase energization on the basis of time.

3. The valve opening and closing timing control device according to claim 1 , wherein
the control unit controls the interval between the one-phase energization and the next one-phase energization on the basis of the rotation angle of the motor.

4. The valve opening and closing timing control device according to claim 3 , wherein
the control unit determines the phase of the motor to be subjected to the one-phase energization on the basis of the rotation angle.

5. The valve opening and closing timing control device according to claim 1 , wherein
the control unit sequentially performs the one-phase energization for the phases of the motor.

6. The valve opening and closing timing control device according to claim 2 , wherein
the control unit sequentially performs the one-phase energization for the phases of the motor.

Assignees

• Aisin Corp

Inventors

• Kasuya Yuki
• Ito Shugo
• Nakai Takano
• Suzuki Kenichiro
• Kamoyama Yoshiyuki
• Hirota Toru

Classifications

• F02D41/20

  Output circuits, e.g. for controlling currents in command coils · CPC title

• F01L13/065

  Compression release engine retarders of the "Jacobs Manufacturing" type · CPC title

• F01L1/356 Primary

  making the angular relationship oscillate {, e.g. non-homokinetic drive} · CPC title

• F01L2820/032

  Electric motors · CPC title

• F01L2013/103

  Electric motors · CPC title