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Direct injection pump control for low fuel pump volumes

A technology of direct injection and fuel pump, which is applied in the direction of fuel injection control, fuel injection pump, fuel injection device, etc., and can solve the problems of non-repeatability and unreliability

Active Publication Date: 2020-01-17
FORD GLOBAL TECH LLC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, the inventors herein have recognized a potential problem with the approach of US 6725837
First, while the method of Hiraku et al. can provide control of a direct-injection fuel pump as described for a fuel discharge rate range of 0% to 100%, Hiraku et al. to 15%) various problems that may arise
Here, the inventors have recognized that when small pumped volumes or discharge rates are desired, control strategies are required to specifically address the non-repeatability and unreliability that may be associated with rapidly opening and closing solenoid valves

Method used

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  • Direct injection pump control for low fuel pump volumes
  • Direct injection pump control for low fuel pump volumes
  • Direct injection pump control for low fuel pump volumes

Examples

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Embodiment Construction

[0014] The following detailed description provides several control strategies for a direct injection fuel pump, its associated fuel and engine systems, and for regulating the volume and pressure of fuel delivered via the direct injection fuel pump to the direct injection fuel rail and injectors . figure 1 A schematic diagram of an example fuel system is shown in , while figure 2 is shown coupled to the figure 1 A close up view of the solenoid spill valve of a direct injection fuel pump. image 3 A hold-to-delivery or hold-to-TDC control strategy for operating a direct injection fuel pump is shown. Figure 4 An example minimum fire angle control strategy for operating a direct injection fuel pump is diagrammatically shown, while Figure 5 show with Figure 4 The flow chart corresponding to the control strategy. at last, Figure 6 Another embodiment of a direct injection fuel pump is shown in .

[0015] With respect to terminology used throughout the detailed description...

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Abstract

The present invention relates to direct injection pump control for low fuel pumping volumes. A method for controlling an electromagnetic spill valve of a direct injection fuel pump is provided, wherein the electromagnetic spill valve is energized and de-energized according to certain conditions. When a small fractional trap volume is specified, a control strategy is required to operate the direct injection fuel pump, where a small amount of fuel is compressed and sent to the direct injection fuel rail. To maintain reliable and repeatable electromagnetic spill valve behavior for small fractional trap volumes, a method is proposed that involves energizing the electromagnetic spill valve for a minimum angular duration below the trap volume fraction threshold.

Description

technical field [0001] The present application generally relates to control schemes for direct injection fuel pumps when operating at low displacement volumes in internal combustion engines. Background technique [0002] Some vehicle engine systems utilizing direct in-cylinder injection of fuel include a fuel delivery system having a plurality of 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 power efficiency and the range of fuel that can be delivered to the cylinders. GDI fuel injectors may require high pressure fuel to be injected, resulting in enhanced atomization for more efficient combustion. As an example, a GDI system may utilize an electrically driven low pressure pump (i.e., fuel lift pump) and a mechanically driven high pressure pump (i.e., direct injection pump) arranged in series along the fuel passage between the fuel tank and the fuel injector, respectivel...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F02M59/36F02D41/40F02M63/02
CPCF02M59/366F02D41/009F02D41/20F02D41/3845F02D2041/2027F02D2250/31F02M59/20
Inventor R·D·珀西富尔M·迈因哈特
Owner FORD GLOBAL TECH LLC