EGR valve maintenance method

Details EGR valve maintenance method EGR valve maintenance method

1996-04-22

1997-09-16

Wolfe, Willis R.

Internal-combustion engines

Charge forming device

Crankcase vapor used with combustible mixture

F02M 2507

Patent

active

056669321

ABSTRACT:
A maintenance method for periodically maintaining the operating condition of an exhaust gas recirculation valve for controlling recirculation of internal combustion engine exhaust gas from an exhaust gas path to an engine intake air path in which the valve is periodically driven to a maximum open position and then back to an initial position, such as a closed position when engine operating conditions are such that there is no driveability or emissions penalty associated with such valve maintenance and when sufficient battery drive voltage is available to drive the valve as required for maintenance thereof.

REFERENCES:
patent: 4364368 (1982-12-01), Blanchette
patent: 4378777 (1983-04-01), Iida et al.
patent: 4428355 (1984-01-01), Yokooku
patent: 5027781 (1991-07-01), Lewis
patent: 5508926 (1996-04-01), Wade
patent: 5546915 (1996-08-01), Isobe
patent: 5579743 (1996-12-01), Kadowaki

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