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Method and system for fuel injector balancing

A fuel injection and injector technology, applied in fuel injection control, combustion engine, machine/engine, etc., can solve the problems affecting the opening time and so on

Pending Publication Date: 2021-01-19
FORD GLOBAL TECH LLC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In other words, the injector closing time (e.g., up to 5ms) affects the opening time required for subsequent (closely spaced) injections

Method used

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  • Method and system for fuel injector balancing
  • Method and system for fuel injector balancing
  • Method and system for fuel injector balancing

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Embodiment Construction

[0022] The following description relates to systems and methods for calibrating fuel injectors in engines, such as coupled to figure 1 in the propulsion system figure 2 fuel system. The fuel injectors may be direct fuel injectors and / or port fuel injectors. The controller can be configured to execute control programs such as image 3 An example procedure for knowing the pulse width error ( Image 6 ). The controller can know the fuel rail pressure drop for the group of injections and correlate the sensed pressure drop to the total volume of fuel delivered ( Figure 4 to Figure 5 ). The controller can then know the error produced by each injection in the group after the closely spaced preceding injection by compensating for the effect of residual energy at the injector from the preceding injection ( Figure 7 ). In particular, the effects of previous injection pulse widths and inter-injection spacing in the group of injections may be compensated for via decay factors. ...

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Abstract

The present invention provides a method and a system for fuel injector balancing. Methods and systems are provided for injector correction learned while a direct injector delivers fuel as a group of fuel injections per cylinder event. The correction is learned using a pressure based injector balancing approach while relies on a sensed pressure drop across the group of fuel injections. Errors for individual pulses of the group of injections is learned as a function of inter-injection spacing and individual pulse-width commands.

Description

technical field [0001] The present description generally relates to methods and systems for calibrating fuel injectors of an engine to balance fuel delivery among all engine fuel injectors. Background technique [0002] Engines may be configured with direct fuel injectors (DI) for injecting fuel directly into cylinders of the engine and / or port fuel injectors (PFI) for injecting fuel into intake ports of cylinders of the engine. Fuel injectors often have time-varying part-to-part variability due to, for example, imperfect manufacturing processes and / or injector aging. Over time, injector performance may degrade (eg, injectors become plugged), which may further increase injector part-to-part variability. As a result, the actual amount of fuel injected to each cylinder of the engine may not be the desired amount, and the difference between the actual amount and the desired amount may vary from injector to injector. Differences in the amount of fuel injected between cylinders...

Claims

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Application Information

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IPC IPC(8): F02D41/00F02D41/40F02D41/38F02D41/24
CPCF02D41/0085F02D41/2467F02D41/3836F02D41/402F02D41/405F02D2041/389F02D2200/0602F02D2200/0616F02D41/2438F02D41/3094Y02T10/40F02D41/2451
Inventor 约瑟夫·莱尔·托马斯伊桑·D·桑伯恩罗斯·戴卡斯特拉·普西福尔马克·米恩哈特
Owner FORD GLOBAL TECH LLC