Internal-combustion engines – Charge forming device – Having fuel vapor recovery and storage system
Patent
1995-01-13
1995-12-12
Miller, Carl S.
Internal-combustion engines
Charge forming device
Having fuel vapor recovery and storage system
123198D, F02M 3704
Patent
active
054740509
ABSTRACT:
An on-board diagnostic system for an evaporative emission control system of an internal combustion engine powered vehicle employs a positive displacement reciprocating pump to create in evaporative emission space a pressure that differs significantly from ambient atmospheric pressure. The pump is powered by using engine intake manifold vacuum to force an intake stroke during which both an internal spring is increasingly compressed and a charge of ambient atmospheric air is created in an air pumping chamber space. Vacuum is then removed, and the spring relaxes to force a compression stroke wherein a portion of the air charge is forced into the evaporative emission space. The rate at which the pump reciprocates to alternately execute intake and compression strokes indicates the pressure and flow through a leak in the evaporative emission space. Detection of this rate serves as a measurement of leakage for the purpose of distinguishing integrity of the evaporative emission space from non-integrity. The disclosed pump has a novel arrangement of its internal valving that reduces the number of parts required in comparison to a previous pump.
REFERENCES:
patent: 3176459 (1965-04-01), Parker
patent: 4551076 (1985-11-01), Dubois
patent: 4846119 (1989-07-01), Geuer
patent: 5193512 (1993-03-01), Steinbrenner
patent: 5230319 (1993-07-01), Otsuka
patent: 5246351 (1993-09-01), Horn
patent: 5297529 (1994-03-01), Cook
patent: 5383437 (1995-01-01), Cook
patent: 5411004 (1995-05-01), Bosato
Busato Murray F.
Cook John E.
Perry Paul D.
Miller Carl S.
Siemens Electric Limited
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