Abstract
The drive to reduce engine emissions has placed an emphasis upon turbocharging especially with the trend of engine downsizing (1, 2). Turbocharged vehicles exhibit a weak point of poor drivability under transient running conditions. Reduced air flow in the combustion chamber while fuel is injected causes inadequate air fuel ratio (i.e. rich mixture). The result is an increased formation of emissions such as CO, NOx which contribute to environmental pollution. Air injection increases the air flow during the transient phase reducing the harmful emissions. Experimental work has shown that injecting air into the manifold greatly improves the transient response of the turbocharger (3, 4). This work has shown that air injection has a large effect upon improving the transient response. This paper shows the effects of air injection using computer simulations and the improvement that the air injection has on the response of the turbocharger within the engine system.
Keywords:Turbocharged, Injection, Model, Transient, Manifold