Document Type and Number:
Japanese Patent JPH0339169
Kind Code:
B2
Abstract:
PURPOSE:To facilitate the warming-up of an engine and the reaction of a catalyzer while preventing the overheat thereof by supplying secondary air for an exhaust system during a predetermined time after the completion of combustion. CONSTITUTION:A secondary air supply pipe 8 is connected to the upstream of a catalyzer 5 for an exhaust pipe 4 and the pipe 8 is provided with a control valve 10. A control device 17 is inputted with a signal 'S1' from a start switch, an engine speed signal 'S2' and a signal 'S3' from a generator, thereby judging whether or not an engine is in a complete combustion condition. In a state of complete combustion, a timer is actuated, and in an idling state, the control valve 10 is opened during a time corresponding to cooling water temperature for the supply of secondary air. According to the aforesaid constitution, the reaction of the catalyzer 5 is facilitated while preventing the overheat thereof.
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Inventors:
MURAMATSU HIROAKI
SUZUKI TOSHUKI
SUZUKI TOSHUKI
Application Number:
JP1725586A
Publication Date:
June 13, 1991
Filing Date:
January 29, 1986
Export Citation:
Assignee:
HONDA MOTOR CO LTD
International Classes:
F01N3/34; F01N3/22
Next Patent: JPH0339170