Exhaust gas purifying system
Patent
·
OSTI ID:7339675
Air is pumped into the engine exhaust manifold to promote oxidation of unburned remnants in exhaust gas when the temperature in a catalytic converter is below a safe level. The air supply to the exhaust manifold is shut off and air is pumped into the catalytic converter to cool it if the temperature goes above the safe level. The catalytic converter includes a catalytic means, having an outer periphery, which is resiliently supported away from the inner circumference of the converter casing. Upon the catalytic means reaching a predetermined maximum temperature, air is pumped into the annular space located between the outer periphery, which may comprise either a particulate or a monolithic catalyst, and the inner circumference of the casing. The annular space communicates with both an exhaust gas inlet chamber located upstream of the catalytic means and an exhaust gas outlet chamber located downstream of the catalytic means, for cooling the catalyst to prevent degradation.
- Assignee:
- Nissan Motor Co., Ltd.
- Patent Number(s):
- US 3967929
- OSTI ID:
- 7339675
- Country of Publication:
- United States
- Language:
- English
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