ENGINE AIR CONTROL -- BASIS OF A VEHICULAR SYSTEMS CONTROL HIERARCHY

A real-time Driver/Vehicle Model, incorporating analog electronics on an engine dynamometer, was developed to allow accurate transient calibration of an experimental engine/transmission and its digital controller. The engine spark advance control system, divorced from engine vacuum and fuel-driven by the Engine Air Control (EAC) system demonstrated significantly reduced interaction and coupling with engine air-fuel ratio. This hierarchial EAC-spark advance structure has been shown to be amenable to simultaneous controller/control law optimization for maximum vehicular fuel economy within specified emission constraints during the cold-start FTP driving schedule. The EAC structure was shown to enable the adaptive phasing of engine airflow to fuel flow. Significantly large and variable fuel delays were identified throughout cold-start, warmup and hot engine transients. The EAC air valve, adaptively delayed as a function of engine coolant temperature, transformed this engine (which at cold-start, 17:1 air-fuel ratio, would hesitate, sag and/or stall) to one which would perform relatively crisply under like FTP driving schedule conditions.

• Supplemental Notes:
  • Prepared for the SAE meeting February 27-March 3, 1978.
• Corporate Authors:

  Society of Automotive Engineers (SAE)

  400 Commonwealth Drive
  Warrendale, PA  United States  15096
• Authors:
  • Stivender, D L
• Publication Date: 1978

Media Info

• Features: References;
• Pagination: 34 p.

Subject/Index Terms

• TRT Terms: Air; Air pollution; Air quality management; Calibration; Control; Control systems; Flow; Fuel conservation; Fuel consumption; Mathematical models; Performance; Transmissions; Vehicle power plants
• Uncontrolled Terms: Air flow; Models
• Old TRIS Terms: Automobile engines
• Subject Areas: Energy; Highways; Safety and Human Factors; Vehicles and Equipment;

Filing Info

• Accession Number: 00177341
• Record Type: Publication
• Source Agency: Engineering Index
• Report/Paper Numbers: SAE 780346 Proceeding
• Files: TRIS
• Created Date: Sep 27 1978 12:00AM