Title:
CONTROL DEVICE FOR VANE-TYPE VARIABLE VALVE TIMING ADJUSTING MECHANISM
Document Type and Number:
WIPO Patent Application WO/2007/125842
Kind Code:
A1
Abstract:
An oil pressure feed passage (28) of an ignition advance chamber (18) and an oil
pressure feed passage (29) of an ignition delay chamber (19) are provided with
check valves (30, 31), respectively, for preventing the back flows of oil from
the chambers (18, 19). The oil pressure feed passages (28, 29) of the respective
chambers (18, 19) are provided with drain passages (32, 33), respectively, for
bypassing the check valves (30, 31). The drain passages (32, 33) are equipped
with drain switching valves (34, 35), respectively. An oil pressure control
valve (21) for controlling the oil pressures to be fed to the ignition advance
chamber (18) and the ignition delay chamber (19) is integrated with a drain switching
control function (38) for controlling the oil pressures to be individually fed
to the drain switching valves (34, 35). The point that the VCT responding rate
is abruptly changed by switching the ON/OFF of the drain switching valves (34,
35) is learned to improve the control characteristics of the region near that
point, at which the VCT responding rate is abruptly changed.
Inventors:
KOBAISHI, Tokuyasu (C/O DENSO CORPORATION 1-1, Showa-cho Kariya-cit, Aichi 61, 4488661, JP)
Application Number:
JP2007/058695
Publication Date:
November 08, 2007
Filing Date:
April 23, 2007
Export Citation:
Assignee:
DENSO CORPORATION (1-1 Showa-cho, Kariya-city Aichi, 61, 4488661, JP)
株式会社デンソー (〒61 愛知県刈谷市昭和町１丁目１番地 Aichi, 4488661, JP)
株式会社デンソー (〒61 愛知県刈谷市昭和町１丁目１番地 Aichi, 4488661, JP)
International Classes:
F02D13/02; F01L1/34
Attorney, Agent or Firm:
YAHAGI, Kazuyuki (6 th Floor, Takisada Bldg. 2-13-19, Nishiki, Naka-ku, Nagoya-cit, Aichi 03, 4600003, JP)