| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a simple and highly reliable air-fuel ratio control device. <P>SOLUTION: The air-fuel ratio control device 1 is configured to control the air-fuel ratio in exhaust gas flowing into a catalytic device 7 by changing the amount of secondary air to be introduced into the upstream side of the catalytic device 7 via a bypass passage 8 from the upstream side of a carburetor 4 in an internal combustion engine 2. The air-fuel ratio control device 1 is configured by housing an electromagnetic valve 9, which opens/closes the bypass passage 8, and a control board 11 in one casing. The control board is configured to execute control of the air-fuel ratio by controlling the proportion of an opening period in a predetermined period of the electromagnetic valve 9. A heat-dissipating member is arranged between the casing and the internal combustion engine 2. <P>COPYRIGHT: (C)2013,JPO&INPIT |
