Title:
【発明の名称】ガスエンジンの空燃比制御方法
Document Type and Number:
Japanese Patent JPH07107379
Kind Code:
B2
Abstract:
The present invention relates to a method of controlling air-fuel ratio of a gas engine provided with a three-way catalyst, based on sensed oxygen concentration at the catalyst. In the present invention, there are the steps of: modulating (21) a periodic drive current for driving an intake by-pass valve (8) with waveforms such as rectangular wave, sinusoidal wave, triangular wave, etc., with predetermined periods and amplitudes, in response to signals transmitted from a main oxygen sensor (11) and a pressure sensor (6), said main oxygen sensor being installed up-stream of the three-way catalyst interposed in an exhaust line of the gas engine, and said pressure sensor being installed in an intake line from a gas-air mixer; detecting (23) distortions of responding waveforms of signals transmitted from a sub oxygen sensor (12), which sensor is installed down-stream of said three-way catalyst; and controlling said drive current so as to remove said distortions, in order to optimizing air-fuel ratio of the gas engine. By means of the present invention, the optimum control of the air-fuel ratio is achieved, and purification efficiency can be improved.
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Inventors:
Hisataka Yakabe
Yuichi Hishinuma
Yuichi Hishinuma
Application Number:
JP23720090A
Publication Date:
November 15, 1995
Filing Date:
September 10, 1990
Export Citation:
Assignee:
Tokyo Gas Co., Ltd.
International Classes:
F02M21/02; F01N11/00; F02D19/02; F02D35/00; F02D41/14; F02D45/00; G05D11/02; (IPC1-7): F02M21/02; F02D41/14; F02D45/00
Attorney, Agent or Firm:
Toshitada Takahashi (1 outside)