Leak test system for vaporized fuel treatment mechanism

Details Leak test system for vaporized fuel treatment mechanism Leak test system for vaporized fuel treatment mechanism

1998-03-27

2000-01-25

Miller, Carl S.

Internal-combustion engines

Charge forming device

Having fuel vapor recovery and storage system

123198D, F02M 3302

Patent

active

060167920

ABSTRACT:
In a leak test system for a vaporized fuel treatment device of a vehicle using negative pressure, a pressure variation rate in a test flowpath is measured in a predetermined time interval, and a reference value which is larger than the minimum variation rate measured is set in a predetermined time interval. Sloshing in a fuel tank is determined by comparing a latest variation rate with the reference value on each occasion. In this way, sloshing can be detected with high precision at any stage of leak testing, and the leak test is stopped when sloshing is detected.

REFERENCES:
patent: 5237979 (1993-08-01), Hyodo
patent: 5297528 (1994-03-01), Mukai
patent: 5299545 (1994-04-01), Kuroda
patent: 5327873 (1994-07-01), Ohuchi
patent: 5333590 (1994-08-01), Thomson
patent: 5353771 (1994-10-01), Blumenstock
patent: 5425344 (1995-06-01), Otsuka
patent: 5542397 (1996-08-01), Takahata
patent: 5775307 (1998-07-01), Isobe

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