Device for detecting malfunction of fuel evaporative purge syste

Details Device for detecting malfunction of fuel evaporative purge syste Device for detecting malfunction of fuel evaporative purge syste

1989-07-21

1990-08-21

Miller, Carl Stuart

Internal-combustion engines

Charge forming device

Having fuel vapor recovery and storage system

123198D, 123494, F02M 3900

Patent

active

049496956

ABSTRACT:
A device for detecting a malfunction of a fuel evaporative purge system comprises a pressure sensor for detecting gas pressure in a purge passage connecting a canister to an intake pipe, and an intake vacuum sensor for detecting a negative pressure in the intake pipe. In the purging condition, the device determines whether the obtained relationship between the detected negative pressure in the purge passage and the detected intake vacuum is within a predetermined area and judges that a malfunction has occurred in the system when the relationship is not within the predetermined area.

REFERENCES:
patent: 4794903 (1989-01-01), Suzuki
patent: 4809667 (1989-03-01), Uranishi
patent: 4834050 (1989-05-01), Uranishi
patent: 4862856 (1989-09-01), Vokoe
patent: 4865000 (1989-09-01), Yajima
patent: 4867126 (1989-09-01), Yonekawa
patent: 4869223 (1989-09-01), Shimomura

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