Canister purge valve for high regeneration airflow
AssigneeSiemens Canada Limited
InventorsUlrich Geiger, Martin Kloda, Christof Schmidt
Life of this patent
Estimating the term…
Abstract
The present invention pertains to an adjustable canister purge valve (9) and method having a first connection (10) for an intake pipe (11) of an engine and a second connection (14) for an activated carbon filter (5). The first (10) and second connection (14) are interconnected by means of a first adjustable valve (16) enabling the flow of a regenerating mixture (8) of air and fuel-vapor. A second valve having a larger flow cross-section (22) is connected in parallel with the first valve (16) and allows a large regeneration air flow, even with a low suction vacuum, and thus improved purge.
Claims18
An adjustable canister purge valve comprising:
- a first connection for an intake pipe of an engine;
- a second connection for a filter;
- a continuously adjustable first valve interconnecting the first and second connections;
- and
- a second valve operable between discrete positions, the second valve interconnecting the first and second connections and being arranged in parallel with the first valve.
A method of operating a canister purge valve, comprising:
- providing a first controllable valve arranged between a first connection and a second connection, and through which a regenerating mixture of air and fuel-vapor flows;
- using feedback to continuously regulate opening the first valve to regenerate an activated carbon filter;
- providing a second valve between the first and second connections and connected in parallel with the first valve;
- and
- using open-loop control to operate the second valve.
An adjustable canister purge valve comprising:
- a first valve lying in a first path having a first cross-sectional area and interconnecting an intake pipe of an engine and a filter, the first valve being continuously adjustable;
- and
- a second valve lying in a second path having a second cross-sectional area and interconnecting the intake pipe of the engine and the filter, the second valve being operable between discrete settings, the second cross-sectional area being larger than the first cross-sectional area, and the second path being shorter than the first path.
An adjustable canister purge valve comprising:
- a first connection for an intake pipe of an engine;
- a second connection for a filter;
- an adjustable first valve interconnecting the first and second connections;
- and
- a second valve interconnecting the first and second connections, the second valve being arranged in parallel to the first valve;
- wherein a single opening signal actuates both valves.
Dependencies are inferred from the claim text.