1987-06-01

Adaptive Engine Controls for Fuel Consumption and Emissions Reduction 870083

The spark advance and fuelling of engines have generally been controlled by fixed open-loop schedules as functions of engine speed and load. Many engines have inferior fuel economy and emissions because of engine/controller mismatch and variations in parameters such as compression ratio. These errors manifest themselves as changes in the rate of burning. A controller is described that can detect these changes and compensate for them by adapting the schedules of spark advance or air:fuel ratio. A detection scheme utilizes engine speed signals to measure the slope of the torque versus spark advance curve without a torque sensor. Comparative fuel economy and emissions results are shown for a fleet of vehicles using an adaptive spark advance controller based on this method. Finally we show how a related fuelling controller can maintain a desired air:fuel ratio without an expensive sensor.

SAE MOBILUS

Subscribers can view annotate, and download all of SAE's content. Learn More »

Access SAE MOBILUS »

Members save up to 43% off list price.
Login to see discount.
Special Offer: Purchase more aerospace standards and aerospace material specifications and save! AeroPaks off a customized subscription plan that lets you pay for just the documents that you need, when you need them.
X