公开(公告)号：US09945272B2

公开(公告)日：2018-04-17

申请号：US15219902

申请日：2016-07-26

Applicant: TOYOTA JIDOSHA KABUSHIKI KAISHA ,  DENSO CORPORATION

Inventor： Yu Yokoyama ,  Haruhito Fujimura ,  Yoshiki Endo ,  Keisuke Hotta

IPC: F01L1/46 ,  F01L1/344 ,  F01L1/047

CPC classification number: F01L1/3442 ,  F01L1/047 ,  F01L1/46 ,  F01L2001/34433 ,  F01L2001/3445 ,  F01L2250/02 ,  F01L2800/17

Abstract: In a variable valve actuation apparatus for an internal combustion engine, a rotor of a variable valve timing mechanism is fixed to one end of a camshaft by a plurality of bolts. An oil control valve configured to control hydraulic pressure that acts on the rotor is fixed to the rotor by one or some of the plurality of bolts. For this reason, by releasing fastening of the bolt that fixes the oil control valve to the rotor among the plurality of bolts that fix the rotor to the one end of the camshaft, the oil control valve is allowed to be removed from the rotor while the rotor is fixed to the camshaft. Therefore, it is not required to perform positioning for fixing the rotor to the camshaft at the time of replacement of the oil control valve.

公开(公告)号：US09816407B2

公开(公告)日：2017-11-14

申请号：US14884061

申请日：2015-10-15

Applicant: DENSO CORPORATION

Inventor： Shuhei Oe ,  Shota Toda ,  Yoshiki Endo ,  Yuu Yokoyama ,  Toshiki Fujiyoshi

IPC: F01L1/344 ,  F02D13/02

CPC classification number: F01L1/3442 ,  F01L2001/34456 ,  F02D13/0238 ,  Y02T10/18

Abstract: When a lock demand of a camshaft phase occurs, a control mode of a hydraulic control valve is switched to a locking mode after the camshaft phase is controlled to a lock phase, and a lock pin is moved to a lock position. The camshaft phase is locked at the lock phase, and timing advance and timing retard chambers communicate with each other through a back space. In this state, a locking time filling control is executed. In the locking time filling control, the control mode of a hydraulic control valve is switched to a filling mode, the hydraulic oil is supplied to a timing advance chamber, both of the timing advance chamber and the timing retard chamber are filled with the hydraulic oil, the back space is filled with the hydraulic oil, and thereafter the control mode of the hydraulic control valve is returned to the locking mode.