Exhaust gas cleaning apparatus of an internal combustion engine
Disclosed is an exhaust gas cleaning apparatus of an internal combustion engine, provided with a three-way catalytic converter and a vacuum-operated flow control valve having a diaphragm for controlling the amount of secondary air directed into an exhaust manifold of the engine for an effective operation of the three-way catalytic converter. The diaphragm operates to increase or decrease the amount of secondary air in accordance with the change of vacuum force on the diaphragm, which force is generated by a vacuum signal transmitted into the valve from an intake manifold of the engine. Means are provided for compensating the difference in the vacuum levels between a high-load condition and a low-load condition so that the rate of increase in the vacuum force of the diaphragm is substantially kept near a constant value for every kind of engine condition. Thus, an ideal operation of the three-way catalytic converter can be obtained.
- Assignee:
- Toyota Jidosha Kogyo Kabushiki Kaisha
- Patent Number(s):
- US 4154057
- OSTI ID:
- 5941370
- Country of Publication:
- United States
- Language:
- English
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