Camless Engine Control for a Robust Unthrottled Operation

Substantial improvements in engine fuel efficiency, torque and reduction of emissions are available with camless actuation capable of continuous control of engine valve lift, duration and timing. A phenomenological model has been developed for an unthrottled operation that is key to efficiency gain. An adaptive nonlinear controller has been designed to coordinate intake valve lift and duration by using high sampling rate intake manifold pressure and flow sensors. The driver torque demand is satisfied, while pumping losses are minimized. Simulation results for a 4 cylinder 2.0 L engine demonstrate event-to-event tracking and cylinder-to-cylinder balancing. The controller corrects for variations in effective flow areas (e.g. valve deposits), induction ram effects, and temperature.

• Record URL:
  • https://doi.org/10.4271/981031
• Availability:
  • Find a library where document is available. Order URL: http://worldcat.org/issn/01487191
• Supplemental Notes:
  • Abstract reprinted with permission of SAE International.
• Authors:
  • Ashhab, M
  • Stefanopoulou, A
  • Cook, J
  • Levin, M
• Conference:
  • International Congress & Exposition
  • Location: Detroit Michigan, United States
  • Date: 1998-2-23 to 1998-2-26
• Publication Date: 1998-1-23

Language

• English

Media Info

• Media Type: Web
• Serial:
  • SAE Technical Paper
  • Publisher: Society of Automotive Engineers (SAE)
  • ISSN: 0148-7191
  • EISSN: 2688-3627
  • Serial URL: http://papers.sae.org/

Subject/Index Terms

• TRT Terms: Engine cylinders; Engine valves; Manifolds
• Subject Areas: Highways; Vehicles and Equipment;

Filing Info

• Accession Number: 01792607
• Record Type: Publication
• Source Agency: SAE International
• Report/Paper Numbers: 981031
• Files: TRIS, SAE
• Created Date: Dec 9 2021 10:12AM