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Method and system for pulsed lift pump control

A technology for lifting pumps and pulse energy, which is applied in electrical control, charging system, engine control, etc. It can solve problems such as the impact of pressure control on fuel accuracy, and achieve the effects of improving fuel economy and reducing energy consumption

Pending Publication Date: 2019-12-31
FORD GLOBAL TECH LLC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

If the pump is not properly characterized, pressure control and therefore fueling accuracy may be affected

Method used

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  • Method and system for pulsed lift pump control
  • Method and system for pulsed lift pump control
  • Method and system for pulsed lift pump control

Examples

Experimental program
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Embodiment Construction

[0017] The following detailed description provides information regarding the fuel lift pump, its associated fuel and engine systems, and several control strategies for calibrating the lift fuel pump. figure 1 A simplified schematic diagram of an exemplary engine system including a lift fuel pump is shown in . The engine controller can be configured to execute control programs such as figure 2 Exemplary procedure for ) to calibrate the lift pump independently of the pump's mode of operation (that is, when in pulsed or continuous mode). figure 2 method also refer to Figure 8 to Figure 9 described in detail. exist image 3 An exemplary unit response of the pump is shown graphically in . exist Figure 4 to Figure 5 An exemplary calibration profile of a lift pump that can be generated while operating in pulsed mode is shown in . exist Figure 6 An exemplary method for pressure control of a lift pump via ramping an applied pulse is shown in . exist Figure 7 Exemplary fu...

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PUM

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Abstract

Method and system for pulsed lift pump control are disclosed. Methods and systems are provided for calibrating a fuel lift pump. While operating in a pulsed mode, a duty cycle of the pulse is ramped in. Based on the ramp rate of the applied voltage or current relative to a resulting rate of change of the fuel pressure, a calibration gain or transfer function value is estimated and applied during subsequent fuel pump operation.

Description

technical field [0001] The present application generally relates to a control scheme for a lift fuel pump of an internal combustion engine operating in a pulsed mode with intermittently applied current pulses. Background technique [0002] Some vehicle engine systems that utilize direct in-cylinder fuel injection include a fuel delivery system having multiple fuel pumps for providing the proper fuel pressure to the fuel injectors. This type of fuel system (Gasoline Direct Injection (GDI)) is used to increase the power efficiency and range in which fuel can be delivered to the cylinders. GDI fuel injectors may require high pressure fuel injection to produce enhanced atomization for more efficient combustion. As an example, a GDI system may utilize an electrically driven lower pressure pump (i.e. fuel lift pump) and a mechanically driven higher pressure pump (i.e. , direct injection pump). In many GDI applications, the lift fuel pump initially pressurizes the fuel from the ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F02D41/30F02D41/38F02D41/24F02D41/20
CPCF02D41/20F02D41/2432F02D41/3082F02D41/3854F02D2041/2003F02D2200/0602F02D2250/02F02D41/2464F02D2041/2024F02D2200/0606F02M37/007F02M37/10F02M2037/085
Inventor 迈克尔·乌里奇罗斯·普西福尔
Owner FORD GLOBAL TECH LLC