Title:
内燃機関のバルブ制御装置
Document Type and Number:
Japanese Patent JP4122797
Kind Code:
B2
Abstract:
The invention controls the opening of an oil control valve (OCV), which controls the operation of a variable valve timing mechanism in an internal combustion engine, according to a duty ratio of a driving pulse signal. An electronic control unit (ECU) performs feedback control on a duty ratio DR of the driving pulse signal during ordinary operation based on a target value and an actual value of the valve timing. When the oil temperature is low (i.e., when the operating oil viscosity is high), the ECU controls the valve timing of the engine by repeating an inching operation that maintains the duty ratio DR of the signal at a large value (i.e., 0% or 100%) for a predetermined hold time so as to operate the variable valve timing mechanism, and then maintaining the duty ratio DR of the signal at a value (50%) that does not operate the variable valve timing mechanism.
Inventors:
Shinya Kondo
Hiroyasu Koyama
Hiroyasu Koyama
Application Number:
JP2002051439A
Publication Date:
July 23, 2008
Filing Date:
February 27, 2002
Export Citation:
Assignee:
TOYOTA JIDOSHA KABUSHIKI KAISHA
International Classes:
F01L1/34; F01L1/344; F01L13/00
Domestic Patent References:
| JP2001164964A | ||||
| JP5106416A | ||||
| JP10339123A | ||||
| JP11002142A | ||||
| JP7084649A |
Attorney, Agent or Firm:
Takashi Ishida
Jun Tsuruta
Tetsuro Shimada
Masaya Nishiyama
Jun Tsuruta
Tetsuro Shimada
Masaya Nishiyama