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System and method for injector coking diagnostics and mitigation

A technology of injectors and fuel injectors, which is applied in the direction of charging system, fuel injection device, fuel injection control, etc., and can solve the problems of confusing fuel metering errors, inability to determine and correct fuel metering, incorrect correction of fuel metering, etc.

Active Publication Date: 2014-10-29
FORD GLOBAL TECH LLC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

As one example, air metering errors can confound fuel metering errors, resulting in incorrect corrections of fuel metering
As in the second example, it may not be possible to determine how to correct the fuel metering, even if the fuel metering errors are separately identifiable

Method used

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  • System and method for injector coking diagnostics and mitigation
  • System and method for injector coking diagnostics and mitigation
  • System and method for injector coking diagnostics and mitigation

Examples

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Embodiment Construction

[0019] This application describes various methods for identifying fuel coking of an injector based on injector current distribution during operation. In one example, the initial current rise rate of the injector current is mapped to the coking indication, and different adjustments are provided based on the identified coking. The initial current ramp rate may be the initial opening current profile as compared to the expected profile during the opening of the injector to deliver the fuel during engine combustion. The coking indication may be used to adjust fuel injector parameters, such as the slope and / or offset between fuel injector pulse width and fuel injection quantity. Additionally, fuel injector degradation may be indicated based on the degree of injector coking, and / or remedial action may be taken to reduce coking.

[0020] In one example, a decrease in the current rise rate may indicate an increase in coking, and a degree of change in the ejector rise rate may indicate...

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PUM

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Abstract

A system and method for compensating for, or alleviating accumulation of, coking residues on fuel injectors is disclosed. The method includes adjusting an engine operating parameter based on a shift in a fuel injector current profile during an initial current rise of injector activation.

Description

technical field [0001] The present invention relates to fuel injectors, such as direct injection (DI) fuel injectors. Background technique [0002] Fuel injectors meter fuel injected to the engine through electromechanical actuation of fuel injection valves. The opening duration of the valve, sometimes referred to as the injector pulse width, can be adjusted to vary the amount of fuel delivered when injected. To provide the required amount of injected fuel, the opening duration may be determined based on operating conditions including expected fuel flow during opening of the injector. Unexpected changes in injector operation can cause fuel metering errors. For example, injector coking, including deposits built up at valve orifices, affects the amount of fuel delivered for a given injection, but also changes the spray pattern. Variations in fuel metering can be extreme, resulting in inaccurate air / fuel control and potential emissions or drivability impacts. [0003] One a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F02D41/38F02M65/00
CPCF02D41/3005F02D41/20F02D41/221F02D41/2467F02D37/02F02D2041/2003F02D2041/2058
Inventor T·A·瑞帕森J·N·阿瑞E·克兰吉尔
Owner FORD GLOBAL TECH LLC
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