| 摘要 |
A system for introducing secondary air into gas exhausted from an internal combustion engine of the carburetor type, provided with a three-way catalytic converter in the exhaust system of the engine. The system includes a flow control valve having a diaphragm operated valve member for controlling the amount of secondary air in accordance with electric signals from a lambda -sensor arranged in an exhaust system of the engine so that excess air ratio lambda of the exhaust gas, which is introduced into the three-way catalytic converter, is controlled near 1.0. Therefore, effective cleaning operation of the three-way catalytic converter is expected.
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