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Systems and methods for improving canister purging

A filter tank and purge valve technology, applied in the field of purge system, can solve problems such as unfavorable filter tank purge

Active Publication Date: 2016-07-20
FORD GLOBAL TECH LLC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, manifold vacuum during idle conditions will not be beneficial for canister purge

Method used

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  • Systems and methods for improving canister purging
  • Systems and methods for improving canister purging
  • Systems and methods for improving canister purging

Examples

Experimental program
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Embodiment Construction

[0024] The following detailed description deals with improvements to be included in engine systems such as figure 1 A system and method for purging a fuel vapor canister in an engine system). The engine system may be a boosted engine including a turbine and a compressor. The fuel vapor canister may be coupled to the engine intake via a canister purge valve including a solenoid valve and a sonic choke housed within a common receptacle of the canister purge valve. Fuel vapors stored in the fuel vapor canister may be purged into the intake air of the engine via two paths. During non-boost conditions, fuel vapors may be purged into the intake manifold via the solenoid valve and through the sonic choke of the canister purge valve ( figure 2 ). During pressurized conditions, fuel vapors from the fuel vapor canister may be purged through the solenoid valve of the canister purge valve, bypassing the sonic choke, into the suction which is coupled to the bypass passage surrounding t...

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PUM

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Abstract

Systems and methods are provided for controlling a purging operation of a fuel vapor canister in a boosted engine. One method comprises purging stored fuel vapors from the fuel vapor canister to an inlet of the compressor via an ejector while bypassing a canister purge valve, the ejector being fluidically coupled to the fuel vapor canister by a distinct passage and motive flow through the ejector being regulated by a shut-off valve. The shut-off valve is temporarily closed in response to an operator tip-in event to discontinue the purging operation.

Description

technical field [0001] The present disclosure relates to systems and methods for improving purging of fuel vapors from a fuel vapor canister. Background technique [0002] Vehicle fuel systems include evaporative emission control systems designed to reduce the release of fuel vapors to the atmosphere. For example, vaporized hydrocarbons (HC) from a fuel tank may be stored in a fuel vapor canister packed with a sorbent that absorbs and stores the vapor. At a later time, when the engine is operating, the vapor emission control system may allow vapors to be purged into the engine intake manifold for use as fuel. [0003] The purging of fuel vapors from the fuel vapor canister may include opening a canister purge valve coupled to a conduit between the fuel vapor canister and the intake manifold. During purging operations, vacuum or negative pressure in the intake manifold may draw air through the fuel vapor canister, enabling desorption of fuel vapors from the canister. These...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F02M25/08
CPCF02M25/08F02M25/0836F02D41/0007F02D41/0032F02D41/004F02D2250/41F02M35/10222F02M35/10229F02M35/104F02B29/0406F02M25/089F02B37/162Y02T10/12F02D41/26F02M25/0854
Inventor R·D·珀西富尔J·N·阿勒瑞
Owner FORD GLOBAL TECH LLC