Title:
異なる高度での動作のための可変弁の作動制御
Document Type and Number:
Japanese Patent JP4394519
Kind Code:
B2
Abstract:
A method of controlling a variable valve actuation system for an engine is provided. A cam assembly is operated to move an intake valve between a first position and a second position. A parameter indicative of an altitude at which the engine is operating is sensed. A first lookup map is accessed to determine a desired air-to-fuel ratio when the sensed parameter indicates that the engine is operating at an altitude below a first predetermined value. A second lookup map is accessed to determine a desired air-to-fuel ratio when the sensed parameter indicates that the engine is operating at an altitude above the first predetermined value. A desired valve actuation period is determined based on the determined air-to-fuel ratio. The intake valve is prevented from returning to the first position until the end of the determined valve actuation period.
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Inventors:
David A. Pierpont
Thomas Jay Crowell
Thomas Jay Crowell
Application Number:
JP2004156801A
Publication Date:
January 06, 2010
Filing Date:
May 26, 2004
Export Citation:
Assignee:
CATERPILLAR INCORPORATED
International Classes:
F01L13/00; F02D13/02; F01L1/34; F02B75/02; F02D41/00; F02D41/02; F02D41/24; F02D43/00; F02D45/00; F02M51/00; G06F19/00; G06G7/70; F02B29/04
Domestic Patent References:
| JP5044503A |
Attorney, Agent or Firm:
Yoshikazu Tani
Kazuo Abe
Kazuo Abe