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Method and system for fuel system control

A fuel and fuel tank technology, applied in fuel injection control, charging system, electrical control, etc., can solve problems such as engine stall and fuel rail pressure drop

Active Publication Date: 2016-06-01
FORD GLOBAL TECH LLC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The presence of fuel vapor at the pump inlet of a high pressure fuel pump can cause a sharp drop in fuel rail pressure, causing an engine stall

Method used

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  • Method and system for fuel system control
  • Method and system for fuel system control
  • Method and system for fuel system control

Examples

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Embodiment Construction

[0015] Such as Figure 1-2 As shown, methods and systems are provided for improving closed loop lift pump pressure control in an engine having a fuel system in which a low pressure (LP) fuel lift pump draws pressurized fuel from a fuel tank and transfers the pressurized Fuel is supplied to a high pressure (HP) fuel pump. A high pressure fuel pump may further raise the pressure of the pressurized fuel to a level sufficient to inject the fuel directly into the engine cylinders. The lift pump voltage can be commanded to provide the desired lift pump pressure, such as image 3 shown. To reduce fueling errors and possible engine stalls due to falsely high output from the lift pump pressure sensor, the controller may clip the commanded lift pump voltage on the lower side during closed loop fuel pump output control ( Figure 4 ). For example, the controller may be configured to execute programs such as Figure 5 A procedure to apply the minimum pump voltage during a condition wh...

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Abstract

The invention relates to a method and a system for fuel system control. Methods and systems are provided for enforcing a minimum fuel lift pump commanded voltage that is determined as a function of commanded lift pump pressure and fuel flow rate. The minimum fuel lift pump voltage is applied when the commanded voltage is lower than the minimum voltage. The approach reduces engine stalls induced by ingestion of fuel vapors at an injection pump coupled downstream of the lift pump.

Description

technical field [0001] The present disclosure generally relates to fuel systems in internal combustion engines. Background technique [0002] Lift pump control systems can be used for a variety of fuel system control purposes. These may include, for example, steam management, injection pressure control, temperature control, and lubrication. In one example, the lift pump supplies fuel to a high pressure fuel pump that provides high injection pressure to direct injectors in an internal combustion engine. A high pressure fuel pump may provide high injection pressure by supplying high pressure fuel to a fuel rail to which the direct injector is coupled. A fuel pressure sensor may be provided in the fuel rail to enable measurement of fuel rail pressure upon which various aspects of engine operation, such as fuel injection, may be based. [0003] However, the inventors herein have recognized potential problems with such systems. The lift pump pressure sensor can degrade. In p...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F02D41/30F02M37/10
CPCF02D41/3082F02D2200/0602F02M37/103F02D41/20F02D41/26F02D41/3854F02D2041/2048F02D2041/2051F02D2041/223F02M51/00
Inventor R·D·珀西富尔
Owner FORD GLOBAL TECH LLC
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