Reduction of HC emissions for vapor recovery purge systems

Patent · Tue Dec 29 04:00:00 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
• Country of Publication: United States
• Language: English

Related Subjects

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