Title:
The valve timing control system of an internal-combustion engine
Document Type and Number:
Japanese Patent JP6042233
Kind Code:
B2
Abstract:
In a valve timing control system of an internal combustion engine employing both an electric-motor-driven intake valve timing control device (VTC) and an electric-motor-driven exhaust VTC having similar fundamental configurations, a maximum drive-efficiency motor-speed range of a first electric motor of the intake VTC and a maximum drive-efficiency motor-speed range of a second electric motor of the exhaust VTC are set to differ from each other depending on two different working ranges respectively suitable for the intake VTC and the exhaust VTC such that the maximum drive-efficiency motor-speed range of the intake VTC is set higher than that of the exhaust VTC. A reduction ratio of a first speed reducer configured to reduce a rotational speed of the first electric motor is set higher than that of a second speed reducer configured to reduce a rotational speed of the second electric motor.
Inventors:
Ryo Tadokoro
Kawada Makoto
Atsushi Yamanaka
Hiroyuki Nemoto
Kawada Makoto
Atsushi Yamanaka
Hiroyuki Nemoto
Application Number:
JP2013040325A
Publication Date:
December 14, 2016
Filing Date:
March 01, 2013
Export Citation:
Assignee:
Hitachi Automotive Systems, Ltd.
International Classes:
F01L1/352; F01L1/356
Domestic Patent References:
| JP2006207398A | ||||
| JP2005171786A | ||||
| JP200740293A | ||||
| JP2005532503A |
Attorney, Agent or Firm:
Hiromichi Kobayashi
Tomioka Kiyoshi
Tsuyoshi Hashimoto
Tomioka Kiyoshi
Tsuyoshi Hashimoto