Exhaust gas cleaning apparatus for an internal combustion engine
Disclosed is an exhaust gas cleaning apparatus of an internal combustion engine, provided with a three-way catalytic converter, an air-fuel ratio sensor and a secondary air injection system. The secondary air injection system has a diaphragm-operated flow control valve for increasing or decreasing the amount of secondary air introduced into the exhaust manifold of the engine in accordance with electrical signals transmitted from the air-fuel ratio sensor. Means are provided for rapidly increasing or decreasing the air-fuel ratio to a stoichiometric value at the moment when the amount of secondary air passed through the flow control valve is increased or decreased. Therefore, the air-fuel ratio is maintained quite near the stoichiometric value at which the three-way catalytic converter can effectively operate to clean the three major toxic components in the exhaust gas.
- Assignee:
- Toyota Jidosha Kogyo Kabushiki Kaisha
- Patent Number(s):
- US 4162612
- OSTI ID:
- 6067241
- Country of Publication:
- United States
- Language:
- English
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Exhaust gas cleaning apparatus of an internal combustion engine
Exhaust gas cleaning apparatus of an internal combustion engine