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US 10,900,447 B2Granted
Method and system for emissions reduction
AssigneeFord Global Technologies, LLC
InventorsLiangjun Hu, Devesh Upadhyay, Kang Song
Life of this patent
Estimating the term…
Abstract
Methods and systems are provided for coordinated operation of electric variable geometry turbocharger (e-VGT), an exhaust gas recirculation (EGR), and electric motor coupled to the e-VGT for expedited catalyst light-off. In one example, a method may include, during a cold-start, decreasing each of an opening of e-VGT vanes and an opening of an EGR valve while operating the electric motor for braking and reducing the e-VGT speed.
Claims6
A method for an engine, comprising:
- during a first engine start, adjusting a vane position of an electric variable geometry turbocharger (e-VGT) to a first vane position and adjusting a valve position of an exhaust gas recirculation (EGR) system to a first valve opening based on a target boost pressure, and
- during a second engine start, adjusting the vane position to a second vane position and adjusting the valve position to a second valve opening based on each of the target boost pressure and a temperature of an exhaust catalyst, a degree of opening in the first vane position higher than a degree of opening in the second vane position and the first valve opening larger than the second valve opening.
Dependencies are inferred from the claim text.