Robert A. Bolton

Optimizing Engine Parameters with Exhaust Gas Recirculation

In addition to designing and developing hardware to control the exhaust gas recirculation (EGR) rate, it is equally important to tailor the other engine variables. Optimization of air-fuel ratio (A/F) and spark timing is required to achieve the best combination of oxides of nitrogen (NO sub x), hydrocarbon (HC), and carbon monoxide (CO) control, while minimizing the losses in fuel economy and drivability. This paper describes an engine dynamometer and vehicle study which defines the relationship between the above parameters.