Evaporative fuel-purging control system for internal combustion

Details Evaporative fuel-purging control system for internal combustion Evaporative fuel-purging control system for internal combustion

1994-11-09

1995-08-29

Miller, Carl S.

Internal-combustion engines

Charge forming device

Having fuel vapor recovery and storage system

123198D, F02M 3302

Patent

active

054451329

ABSTRACT:
An improved evaporative fuel-purging control system for controlling a purging flow rate which is controlled by a solenoid purge control valve regulated with a pulse waveform signal. As for the characteristic of the purge control valve, differing periods of the signal differentiates the control valve linearity of purging flow rate with respect to the signal duty ratio. To improve the linearity, the pulse waveform signal period which creates the substantial linearity is selected among preset periods periods according to the preset duty ratio which works as a threshold value.

REFERENCES:
patent: 4967713 (1990-11-01), Rojima
patent: 5188085 (1993-02-01), Habagochi
patent: 5216995 (1993-06-01), Hosoda
patent: 5231969 (1993-08-01), Suga
patent: 5259353 (1993-11-01), Nakai
patent: 5263460 (1993-11-01), Baxter
patent: 5263461 (1993-11-01), Fujimoto
patent: 5299544 (1994-04-01), Kitamoto
patent: 5323751 (1994-06-01), Osanai
patent: 5329909 (1994-07-01), Hosoda
patent: 5368002 (1994-11-01), Hoshino

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