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Title:
GAS ENGINE AND AIR-FUEL RATIO CONTROL METHOD THEREOF
Document Type and Number:
Japanese Patent JPH05118240
Kind Code:
A
Abstract:

PURPOSE: To positively and easily reduce vibration of air-fuel ratios by equalizing the feedback periods of air-fuel ratio control in two systems, and shifting the phases in feedback in the two systems 180 degrees one relative to the other.

CONSTITUTION: Intake passages 1-1, 1-2, engines E-1, E-2, and an exhaust passage 10 are provided respectively in two systems. First oxygen sensors 12-1, 12-2 are arranged on the upstream side of a three way catalytic converter 11, and a second oxygen sensor 13 is arranged in the downstream of the three way catalytic converter 11. Further, an air-fuel ratio control device 15 is provided to respond to outputs of the first and second oxygen sensors 12-1, 12-2, 13, and to control the air-fuel ratio of the respective engines independently. Furthermore, the feedback periods of air-fuel ratio control in the engines E-1, E-2 in the two systems are equalized so as to shift the phases in feedback in the two system about 180 degrees one relative to the other. Thus, vibration of air-fuel ratios in the respective systems are negated mutually, and thus the vibration of air-fuel ratios is extremely reduced.


Inventors:
Hishinuma, Yuichi
Fujiwara, Akio
Application Number:
JP1991000279134
Publication Date:
May 14, 1993
Filing Date:
October 25, 1991
Export Citation:
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Assignee:
TOKYO GAS CO LTD
International Classes:
F01N3/20; F01N3/24; F02B75/18; F02D19/02; F02D41/02; F02D41/14; F02M21/02; (IPC1-7): F01N3/20; F01N3/24; F02B75/18; F02D19/02; F02D41/02; F02D41/14; F02M21/02
Attorney, Agent or Firm:
高橋 敏忠 (外1名)