Evaporative fuel control system

Internal-combustion engines – Charge forming device – Having fuel vapor recovery and storage system

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Details

123518, 123458, F02M 2312

Patent

active

051117967

ABSTRACT:
An evaporative fuel control system for internal combustion engine which comprises a canister for storing a fuel vapor, a purge passage connecting the canister to an intake manifold, a valve provided in the purge passage, an engine temperature sensor for sensing an engine temperature, a fuel distillation sensor for sensing a fuel distillation characteristic of a fuel within a fuel tank, a first valve control part for controlling a valve opening position of the valve responsive to an engine temperature signal supplied from the engine temperature sensor, and a second valve control part for controlling a time to turn the valve on responsive to a fuel distillation signal supplied from the fuel distillation sensor. According to the present invention, it is possible to suitably retard the time to start fuel purging into the intake manifold when a heavy type fuel is used, and when a light type fuel is used it is possible to suitably advance the time to start the fuel purging to an initial idling time prior to an idling time, thereby ensuring good driveability and reduction of undesired fuel odor from the canister.

REFERENCES:
patent: 3683878 (1972-08-01), Rogers
patent: 4116184 (1978-09-01), Tomita
patent: 4318383 (1982-03-01), Iritani
patent: 4790283 (1988-12-01), Uranishi
patent: 4865000 (1989-09-01), Yajima
patent: 4926825 (1990-05-01), Ohtaka

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