Closed loop control of automotive engines. Final report Feb 1978-Jun 1980

Technical Report · Tue Dec 01 00:00:00 EST 1981

OSTI ID:5151088

Powell, J D; Glaser, I; Randall, K; Hosey, R

Internal combustion engine economy and emissions are known to be sensitive to changes in engine control variables. Two of the most important variables are fuel/air ratio (F/A) and spark advance. These variables are affected by environmental changes, manufacturing tolerances, and time degradation. The combined effect of all these changes can cause as much as a 15% loss in economy and a 30% increase in emissions. This research concerns the application of optimization theory to develop control laws for use in closed loop control strategies to minimize the effect of the variables discussed above. The report describes the automated dynamometer facility developed for the acquisition of engine mapping data. This data was used to develop analytical functions describing the fuel consumption and emissions at each of 10 torque/RPM points. The functions were used by an optimization procedure to arrive at control strategies and driving cycle predictions of fuel consumption and emissions. The optimum schedules were then used to determine a closed-loop control strategy.

• Research Organization: Stanford Univ., CA (USA). Guidance and Control Lab.
• OSTI ID: 5151088
• Report Number(s): PB-82-164088
• Country of Publication: United States
• Language: English

Related Subjects

33 ADVANCED PROPULSION SYSTEMS
AUTOMOBILES
INTERNAL COMBUSTION ENGINES
CLOSED-LOOP CONTROL
EXHAUST GASES
FUEL CONSUMPTION
COMPUTER CODES
CONTROL SYSTEMS
DYNAMOMETERS
FEEDBACK
FUEL-AIR RATIO
IGNITION SYSTEMS
OPTIMIZATION
CONTROL
ENERGY CONSUMPTION
ENGINES
FLUIDS
GASEOUS WASTES
GASES
HEAT ENGINES
MEASURING INSTRUMENTS
VEHICLES
WASTES
330101* - Internal Combustion Engines- Spark-Ignition