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CPV robust method for vehicle evaporative emission control system

An evaporative emission and vehicle technology, applied in engine control, electrical control, charging system, etc., can solve problems such as CVS cannot be opened in time, CVS blocked, etc., to avoid early warranty problems, avoid engine stalls, and avoid hardware deterioration. Effect

Pending Publication Date: 2022-07-19
FORD GLOBAL TECH LLC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

If the CVS is commanded to open at the threshold EVAP system pressure estimated via the FTPT sensor, the CVS may not open in time since the actual pressure at the CVS may be higher than the pressure recorded by the FTPT, which may cause the CVS to plug

Method used

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  • CPV robust method for vehicle evaporative emission control system
  • CPV robust method for vehicle evaporative emission control system
  • CPV robust method for vehicle evaporative emission control system

Examples

Experimental program
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Embodiment Construction

[0020] The following description relates to systems and methods for monitoring plugging of valves in an EVAP system during diagnosis of an evaporative emission control (EVAP) system. figure 1 A hybrid vehicle propulsion system is shown that is configured to operate with one or both of motor torque from an electric motor and engine torque from an internal combustion engine. figure 2 An engine system of a hybrid vehicle is shown, which may include a fuel system and an EVAP system. The EVAP system may include a canister purge valve (CPV) in a purge line coupling the engine manifold to a plurality of canisters storing fuel vapors, and a canister vent valve (CPV) in a ventilation line coupling the canister to the atmosphere. CVS). A fuel tank pressure sensor (FTPT) may be coupled to the vapor recovery line of the EVAP system to determine fuel tank pressure. EVAP systems may include multiple vapor canisters, each with a bypass valve, such as Figure 3A shown. Figure 3B The dir...

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PUM

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Abstract

The present disclosure provides a CPV robust method for a vehicle evaporative emission control system. Methods and systems are provided for monitoring clogging of a canister vent valve (CVS) in a fuel vapor line during diagnosis of an evaporative emission control (EVAP) system of a vehicle. In one example, a method includes, after isolating the EVAP system from atmosphere, opening each of one or more bypass valves of one or more fuel vapor canister to couple the EVAP system to a fuel system of the vehicle; and opening a canister vent valve (CVS) in response to the EVAP system pressure decreasing to the threshold EVAP system pressure.

Description

technical field [0001] The present specification generally relates to methods and systems for monitoring corking of valves in a fuel vapor system during diagnosis of the fuel vapor system. Background technique [0002] Vehicles may be equipped with evaporative emission control (EVAP) systems 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 filled with sorbent that adsorbs and stores fuel vapor. Later, when the engine is in operation, the EVAP system allows fuel vapors to be drawn from the fuel vapor canister into the engine intake manifold. Fuel vapors are then consumed during combustion. [0003] During certain conditions, the EVAP system may be monitored to identify gaps that may lead to undesired leakage of fuel vapors. For example, a degraded canister purge valve (CPV) coupling the EVAP system to the engine manifold may reduce the efficiency of the EVAP system durin...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F02D41/00F02D41/06F02M25/08
CPCF02D41/0032F02D41/065F02M25/0809F02M25/0854F02M25/0836F02M25/0818F02D41/004F02D2200/0602F02D2200/0606F02D41/221
Inventor 艾德·杜道尔
Owner FORD GLOBAL TECH LLC