VALVE TIMING ADJUSTMENT SYSTEM AND ELECTRONIC CONTROL DEVICE

    公开(公告)号:US20240167399A1

    公开(公告)日:2024-05-23

    申请号:US18425285

    申请日:2024-01-29

    申请人: DENSO CORPORATION

    IPC分类号: F01L1/344 F02D13/02 F02D41/20

    摘要: A valve timing adjustment system includes a valve timing adjustment device, a phase lock mechanism, a hydraulic control valve, an electromagnetic drive section, and an electronic control device. When the lock pin included in the phase lock mechanism and having the tip thereof fitted into a fitting recess is removed from the fitting recess, the electronic control device performs an initial control of applying current to the electromagnetic drive section at a prescribed current value for a prescribed time to move a spool of the hydraulic control valve from an initial position. Thereafter, the electronic control device performs a gradual change control of applying current to the electromagnetic drive section while gradually increasing the current value from a current value smaller than the current value applied in the initial control but greater than 0, to remove the lock pin from the fitting recess.

    Valve timing adjustment device
    7.
    发明授权

    公开(公告)号:US11834970B2

    公开(公告)日:2023-12-05

    申请号:US17674997

    申请日:2022-02-18

    申请人: DENSO CORPORATION

    IPC分类号: F02D13/02 F01L13/00 F01L1/344

    摘要: Hall sensors respectively output a measurement signal, a voltage level of which changes according to a rotation position of an electric motor. A rotation signal generator of a drive circuit generates a rotation speed signal and a rotation direction signal of the electric motor based on the measurement signals. A control circuit generates control signals of the electric motor according to edges of output signals of the rotation signal generator. A signal corrector corrects an excess or a shortage of the edge of the signal at the time of starting the electric motor based on: the voltage levels of the rotation speed signal and the rotation direction signal at the time of turning off and the time of turning on of an electric power source; and a rotation direction of the electric motor at the time of starting thereof.