Exhaust cleaning system for automotive internal combusion engine. [exhaust gas recirculation to heat air-fuel mixture for faster warmup of pollution control devices]
Improvements made in an automotive internal combustion engine enable a thermal reactor, a catalytic converter, or a combination of these to reach their activation temperature in a shortened period of time after the engine has initially been cranked. Toxic combustible residues can then be re-oxidized at an early stage of the idling operation of the engine. The improvements consist of an exhaust recirculation passageway to recirculate the exhaust gases from the engine for warming the air-fuel mixture when the temperature of the exhaust gases is lower than an activation temperature of the thermal reactor or the catalytic converter. Such improvements will be more advantageous when combined with a rapid engine warming arrangement for opening a carburetor throttle valve wider than usual and providing retarded spark-advance timings during cold driving of the engine.
- Assignee:
- Nissan Motor Co., Ltd.
- Patent Number(s):
- US 3927523
- OSTI ID:
- 7355428
- Resource Relation:
- Patent Priority Date: Priority date 13 Mar 1973, Japan
- Country of Publication:
- United States
- Language:
- English
Similar Records
Exhaust gas recirculating system
Exhaust recirculation