Closed-loop engine control

Journal Article · Tue Nov 01 00:00:00 EST 1977 · IEEE Spectrum; (United States)

OSTI ID:5313955

Niepoth, G W; Stonestreet, S P

To meet current U.S. emissions standards for automobiles, hydrocarbon (HC) and carbon monoxide (CO) emissions are usually controlled by a catalytic converter in the automobile exhaust. Federal standards for nitrogen oxides (NO/sub x/) emissions are met mainly by exhaust-gas recirculation (EGR) techniques. However, in 1981, when NO/sub x/ emissions standards are tightened from the current limit of 2.0 grams per mile to 1.0 gram per mile, these techniques alone may no longer be sufficient. Although many schemes are under investigation for meeting the 1981 emissions standards for all three emissions, one of the most promising employs a three-way catalyst--for HC, CO, and NO/sub x/ emissions--in conjunction with a closed-loop engine-control system. The problems involved in this approach and the engineering designs to solve these problems are discussed.

• OSTI ID: 5313955
• Journal Information: IEEE Spectrum; (United States), Vol. 14:11
• Country of Publication: United States
• Language: English

Related Subjects

33 ADVANCED PROPULSION SYSTEMS
AUTOMOBILES
CATALYTIC CONVERTERS
SPARK IGNITION ENGINES
CLOSED-LOOP CONTROL
AIR POLLUTION CONTROL
CARBON MONOXIDE
EXHAUST GASES
FUEL SYSTEMS
FUEL-AIR RATIO
HYDROCARBONS
MONITORING
NITROGEN OXIDES
CARBON COMPOUNDS
CARBON OXIDES
CHALCOGENIDES
CONTROL
ENGINES
GASEOUS WASTES
INTERNAL COMBUSTION ENGINES
NITROGEN COMPOUNDS
ORGANIC COMPOUNDS
OXIDES
OXYGEN COMPOUNDS
POLLUTION CONTROL
POLLUTION CONTROL EQUIPMENT
VEHICLES
WASTES
330701* - Emission Control- Nitrogen Oxides
330702 - Emission Control- Carbon Monoxide
330704 - Emission Control- Hydrocarbons