Abstract
This chapter discusses control of automobile pollution. The principal pollutants that the automobile emits are carbon monoxide (CO), which is a deadly poison; unburned hydrocarbons (HC), which are irritants and sources of smog; and NOx, which is an important link in a chemical chain leading to smog in combination with HC and sunlight. Automobile pollution control is difficult as HC and CO pollution results when the temperatures during combustion are too low, while NOx results when the temperatures are too high. The difficulty with simultaneous control of the pollutants is reflected in the catalysts that might be used to control them. All popular means to control pollutants are very expensive and add considerable complexity to the automobile, confounding both the consumer and repair mechanic and making customer maintenance of the vehicle nearly impossible. Prestratification is a very simple and inexpensive way to control pollution and to increase economy. NOx can be controlled in this manner so that three-way catalysts and electronic carburetion are not required. The prestratification with air is more effective than adding an air pump that delivers air to the exhaust manifold just aft of the exhaust valve. The use of prestratification for pollutant control is currently being applied in combustion control to develop a multifuel engine capability.
Published Version
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