Measuring and testing – Simulating operating condition – Marine
Reexamination Certificate
2006-06-27
2006-06-27
McCall, Eric S. (Department: 2855)
Measuring and testing
Simulating operating condition
Marine
C073S049700
Reexamination Certificate
active
07066017
ABSTRACT:
Pressure leakage in an evaporated fuel control system having a canister for absorbing evaporated fuel in a fuel tank is detected after an engine is stopped and a temperature in the system is stabilized. In the leakage detecting process, communication between the system and an atmospheric pressure is shut-off by closing an electromagnetic valve connected to the canister. The electromagnetic valve is closed by once supplying a full voltage thereto, and the closed-state is maintained by intermittently supplying a voltage in a duty-ratio-controlled manner or by supplying a lower voltage. Thus, power consumption for maintaining the closed-state is reduced.
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Kano Masao
Nagasaki Kenji
DENSO Corporation
McCall Eric S.
Nixon & Vanderhye P.C.
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