| 摘要 |
Automobile exhaust gases are recycled by means of a recycling duct which receives these gases at a restricted upstream end located within the environment of the hot gases of the exhaust system, passes in heat exchange relationship through the conventional intake manifold hot spot to facilitate heating of the latter, and discharges the hot exhaust gases at a restricted downstream end in opposition to the inlet flow of the fuel-air mixture at a location directly below the throttle valve. A second restricted duct extends within the sidewall of the carburetor inlet induction conduit and bypasses the throttle valve, opens into the induction conduit upstream of the throttle valve to receive inlet gases during idle, and discharges into the recycling duct between the latter's upstream and downstream restrictions to inhibit exhaust flow through said recycling duct during engine idle operation.
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