Evaporated fuel recovery device for engines
AssigneeNissan Motor Co., Ltd.
InventorHideharu Kadooka
Life of this patent
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Abstract
The ON/OFF frequency of a purge control valve is defined by a product of an integer and a frequency of REF signal, where the integer does not have a divisor equal to any of the divisors of the number of the cylinders of the engine, other than one. The engine is prevented from being supplied a purge gas concentratedly to a specific cylinder by opening the purge control valve for every five cylinders, for example.
Claims2
An evaporated fuel recovery device adapted to an engine in which an air-fuel mixture of air fed from an intake passage and fuel fed from a fuel tank is combusted sequentially in a plurality of cylinders, comprising:
- means for absorbing evaporated fuel in said tank,
- a purge passage for supplying the fuel absorbed by said absorbing means to said intake passage,
- a purge control valve for opening and closing said purge passage at a predetermined frequency,
- means for outputting a reference signal corresponding to a predetermined stroke of each of said cylinders, and
- means for setting said frequency equal to a product of an integer and a frequency of said reference signal, where said integer does not have a divisor equal to any of the divisors of the number of said cylinders, other than one.
Dependencies are inferred from the claim text.