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Volumetric efficiency based lift pump control

An efficiency and control system technology that can be used in charging systems, machines/engines, liquid fuel feeders, etc., to solve problems such as low efficiency and low efficiency, and efficiency damage to fuel economy.

Inactive Publication Date: 2009-04-08
FORD GLOBAL TECH LLC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Because high-pressure fuel pumps typically operate to provide a greater increase in fuel pressure than low-pressure fuel pumps, inefficiency in high-pressure fuel pumps is more detrimental to fuel economy than inefficiency in low-pressure fuel pumps

Method used

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  • Volumetric efficiency based lift pump control
  • Volumetric efficiency based lift pump control
  • Volumetric efficiency based lift pump control

Examples

Experimental program
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Embodiment Construction

[0014] FIG. 1A shows an engine system 100 that may be configured as a propulsion system for a vehicle. Engine system 100 includes an internal combustion engine (engine) 110 having a plurality of combustion chambers or cylinders 112 . Fuel may be provided directly to cylinder 112 via in-cylinder direct fuel injector (injector) 120 . As indicated schematically in FIG. 1A , engine 110 is capable of receiving intake air and exhausting products of fuel combustion. Engine 110 may comprise a suitable type of engine, including a gasoline or diesel engine.

[0015] Fuel may be provided to engine 110 via injector 120 via a fuel system indicated generally at 150 . In this particular example, fuel system 150 includes fuel storage tank 152 for storing on-board fuel, low-pressure fuel pump (low-pressure pump) 130, high-pressure fuel pump (high-pressure pump) 140, fuel rail 158, and various fuel lines 154 and 156.

[0016] Controller 170 may operate low pressure fuel pump 130 to provide ...

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Abstract

The present invention relates to a volumetric efficiency based lift pump control method. As one example, a method of operating a fuel delivery system of a directly injected internal combustion engine including a plurality of in-cylinder direct fuel injectors, a higher pressure fuel pump and a lower pressure fuel pump is provided. The method comprises operating the lower pressure fuel pump and the higher pressure fuel pump to maintain a prescribed fuel pressure at the fuel injectors; and varying an amount of pump work that is provided by the lower pressure fuel pump relative to the higher pressure fuel pump responsive to an indication of the efficiency of the higher pressure pump.

Description

【Technical field】 [0001] The invention relates to an engine system, a fuel delivery system for an engine, and a method of operating a fuel delivery system for an engine. 【Background technique】 [0002] Some vehicle engine systems utilizing direct injection of fuel in cylinders include a fuel delivery system with multiple fuel pumps for providing proper fuel pressure to the fuel injectors. As one example, a fuel delivery system can utilize an electrically driven low pressure pump (eg, a lift pump) and a mechanically driven high pressure pump disposed in series between the fuel tank and the fuel injector, respectively. In some examples, low pressure pumps have been utilized in conjunction with mechanical non-return fuel systems, so the fuel pressure provided by the low pressure pump is managed by a mechanical bypass regulator (eg, set at 65 psi to 80 psi). [0003] The inventors herein have recognized that selecting operating and control parameters for a low pressure fuel pum...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F02M37/08
CPCF02M37/0058
Inventor 罗斯·戴克斯特拉·珀西富尔
Owner FORD GLOBAL TECH LLC
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