Reduction of HC emissions for vapor recovery purge systems

Patent · Tue Dec 29 00:00:00 EST 1987

OSTI ID:5452681

Cook, J A; Hamburg, D R

This patent describes a method for controlling hydrocarbon emissions from an internal combustion engine having an air/fuel intake coupled to a fuel vapor recovery system, comprising the steps of: providing engine spark timing to the internal combustion engine; periodically purging fuel vapors from the fuel vapor recovery system into the air/fuel intake; retarding the engine spark timing whenever the step of purging is initiated; and advancing the engine spark timing back to its timing before the step of purging was initiated.

• Assignee: Ford Motor Co., Dearborn, MI
• Patent Number(s): US 4715340
• OSTI ID: 5452681
• Resource Relation: Patent File Date: Filed date 4 May 1987
• Country of Publication: United States
• Language: English

Related Subjects

33 ADVANCED PROPULSION SYSTEMS
54 ENVIRONMENTAL SCIENCES
HYDROCARBONS
AIR POLLUTION ABATEMENT
SPARK IGNITION ENGINES
EMISSION
FUEL SYSTEMS
COMBUSTION CONTROL
FUEL-AIR RATIO
TIMING PROPERTIES
VAPORS
CONTROL
ENGINES
FLUIDS
GASES
HEAT ENGINES
INTERNAL COMBUSTION ENGINES
ORGANIC COMPOUNDS
POLLUTION ABATEMENT
330101* - Internal Combustion Engines- Spark-Ignition
330704 - Emission Control- Hydrocarbons
500200 - Environment
Atmospheric- Chemicals Monitoring & Transport- (-1989)