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Methods and systems for fuel vapor management

A technology of fuel vapor and intake manifold, which is applied in the charging system, brake safety system, adding non-fuel substances to fuel, etc., which can solve the problems of high cost, increased parasitic load, and reduced fuel economy

Active Publication Date: 2021-02-26
FORD GLOBAL TECH LLC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, such pumps can be expensive, and the electricity to power them can add parasitic loads (which reduce fuel economy)

Method used

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  • Methods and systems for fuel vapor management
  • Methods and systems for fuel vapor management
  • Methods and systems for fuel vapor management

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 800

[0086] Embodiment 800 includes second aspirator 216 coupled in throttle bypass 838 . The throttle bypass 838 includes a throttle bypass valve 828, which may be similar to the crankcase ventilation valve 28 of the previous embodiment. Thus, the throttle bypass flow may be adjusted by the opening of the throttle bypass valve 828 . In one example, the opening of throttle bypass valve 828 may vary with the pressure differential across throttle bypass valve 828 , such as described earlier.

[0087] Embodiment 800 also includes an orifice 814 coupled along conduit 820 that can regulate fuel vapor flow along conduit 820 . Check valve 854 arranged in series with orifice 814 allows fuel vapor flow from crankcase 114 toward intake manifold 144 (to position 617) and may block flow from intake manifold 144 toward crankcase 114. Likewise, orifice 814 may allow for a lower fuel vapor flow rate during deep vacuum (eg, higher vacuum levels) in the intake manifold. In other words, orifice 8...

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PUM

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Abstract

The present invention relates to methods and systems for fuel vapor management. Methods and systems for venting a crankcase in an engine are provided. In one example, fuel vapors from the crankcase may flow to each of a compressor inlet and an intake manifold of the engine when the engine is operating at boost under cruise conditions. In this way, the crankcase can be efficiently extracted.

Description

[0001] Cross References to Related Applications [0002] This application is a continuation-in-part of U.S. Patent Application No. 13 / 660,884, "METHOD AND SYSTEM FOR FUEL VAPOR MANAGEMENT," filed October 25, 2012, the entire contents of which are incorporated by reference incorporated herein for all purposes. technical field [0003] The present invention relates to a method for controlling crankcase ventilation in a boosted engine. Background technique [0004] Vehicle emission control systems may be configured to store fuel vapors from fuel tank refueling and daily engine operation in an activated carbon canister. During subsequent engine operation, the stored vapors can be purged into the engine where they are combusted. Various methods may be used to create the vacuum used to draw fuel vapors. For example, intake manifold vacuum developed during engine spin may be used to draw in stored fuel vapors. As another example, boosted intake air may be used directly or indir...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F02M25/08F02M33/00
CPCF02M25/089F02M33/00B60T13/46B60T17/22F01M13/023F01M2013/0044F01M2013/026F01M2013/027F02B37/16F02M25/06F02M25/08Y02T10/12
Inventor R·D·珀西富尔J·N·尤瑞K·J·布鲁尔M·斯特德曼
Owner FORD GLOBAL TECH LLC