Showing papers on "Secondary air injection published in 1968"

Filtering device for vehicle exhaust

Abstract: A filtering device is described which attaches temporarily to the exhaust pipe of an internal combustion engine powered automobile. The device includes a multiply bag operating to filter out moisture and solid particles discharged from the exhaust pipe.

Method of reducing internal combustion engine emissions

Abstract: A system is described for reducing unburned hydrocarbons and carbon monoxide emitted from internal combustion spark ignition engines. The system comprises means for supplying a leaner-thanstoichiometric air/fuel mixture to the cylinders of the engine for combustion, means for conserving the heat of the exhaust products formed on combustion of the air/fuel mixture, and means for controlling the exhaust back pressure under low power demand. The means for conserving the exhaust heat includes the combination of an insulated exhaust port, insulated exhaust manifold and an insulated exhaust pipe; the back pressure control means consists of a valve placed in the exhaust pipe, said valve being responsive to vacuum signal and an exhaust back pressure signal. A method of operating an engine utilizing said system is also described.

Nonlethal thermal-aerosol generator weapon

Abstract: A weapon for producing a nonlethal, voluminous fog of tear gas or riot control agents or material for controlling one or more persons is provided with a two-cycle internal combustion engine that drives an air blower. A manifold is connected to the engine exhaust to cause the exhaust gases to turn at least 90*, and pass through a pipe to be discharged in the outlet opening of the blower. The liquid to be produced as a fog is drawn or injected into the manifold, and is vaporized by the hot exhaust gases. This vapor is discharged or drawn from the pipe by the air blown by the blower and further atomized to efficiently produce a dense, voluminous fog containing air, the vaporized and atomized liquid material, and the engine exhaust gases.

Fuel-controlling device

Abstract: An air valve is disposed in the air flowing through a carburetor to the intake manifold of an internal combustion engine. A fuel valve controls the fuel flow to a mixing chamber which produces a suspension of fuel particles which are entrained in the airflow. The air valve is operably connected to the fuel valve through the mixing chamber.

Device for automobiles for preventing air contamination

Abstract: A device for automobiles for preventing air contamination by forcing compressed air to an engine exhaust manifold for reburning the incompletely burned components of the engine exhaust gas. The device comprises a compact air-pump-alternator consisting of an air pump portion and an alternator portion connected in series with the air pump along a common shaft. The air pump delivers compressed air generated thereby into the alternator for cooling. The compressed air, which is heated by cooling the alternator, is forced into the engine exhaust manifold for effectively reburning the incompletely burned components.

Exhaust cooling system

Abstract: An air intake pressure unit is attached to the exhaust section of a jet ene. The unit comprises several passages which extend out beyond the end of the jet engine and through which passages engine exhaust and cooling air is passed so that cooling air passes over and mingles with exhaust gases from the engine. Construction is such that the lower static pressure formed by the exhaust gases assists in drawing in the cooling air.

Paper 4: The Effect of Combustion Chamber Shape and Other Engine Design Factors on Exhaust Emissions

Abstract: A Heron combustion chamber engine of 2 litre capacity has been utilized to investigate the effect of combustion chamber shape, increased mixture movement, valve timing, mixture formation, and reaction in the exhaust system on engine performance and level of exhaust emissions using the seven-mode U.S. Federal cycle.Such factors as carburettor weakening and limitation of intake manifold vacuum during overrun have been included in this investigation, and it has been shown that it is possible to reduce exhaust emissions and also satisfy the current U.S. requirements with an engine giving acceptable performance, improved economy, and unaffected reliability.Much of the information reported may be negative in terms of improvement to exhaust emissions by detailed engine design. Nevertheless, some positive conclusions have been reached as a result of this work, and it is hoped that this will draw forth more informed discussion than the authors have been able to assemble from the work attempted with one basic engine.

Paper 8: Engine Tuning to Minimize Exhaust Emissions:

Abstract: With the minimum amount of time available to satisfy impending pollution regulations, a hurried programme of engine research and development was embarked upon to reduce emissions by the simplest and quickest means.Early attempts with air injection methods had shown promising results, but installation problems resulted in efforts directed towards an engine tuning approach.With lean set carburation and retarded ignition, tests showed that emission levels could be reached which were within striking distance of the proposed limits.Analysis of the various modes of operation showed that deceleration peaks, and in the case of manual transmissions, gear change peaks, were highly contributing factors.A simple type poppet valve incorporated in the throttle plate of the carburettor, and set to operate at a given manifold depression, considerably reduced emissions during deceleration and gear change, bringing composite values within the prescribed limits. Further development of the valve was undertaken and is describ...