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Method and system for pulsed engine water injection

An engine, water injection technology, applied in the direction of engine components, engine operation, engine control, etc., can solve problems such as uneven distribution, unrealized water injection potential, and lack of charging air cooling.

Active Publication Date: 2018-06-26
FORD GLOBAL TECH LLC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In some cases, this can exacerbate any existing cylinder-to-cylinder imbalance (e.g. uneven coolant temperature distribution due to air-fuel ratio imbalance)
Overall, this uneven distribution can lead to the fact that the full potential of water injection is not realized (for example, due to insufficient cooling of the charge air)

Method used

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  • Method and system for pulsed engine water injection
  • Method and system for pulsed engine water injection
  • Method and system for pulsed engine water injection

Examples

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Embodiment Construction

[0014] The following description relates to systems and methods for improving the use of water from a water injection system coupled to a vehicle engine, as referenced figure 1 The vehicle system described. as reference Figure 2 to Figure 4 As shown, the engine system may be configured with water injectors at various locations to provide various water injection benefits such as charge air cooling, engine component cooling, and engine dilution. The controller can be configured to execute control programs such as Figure 5 A sample program to learn and compensate for imbalanced water distribution between cylinders due to differences in air flow, pressure, and architecture for each cylinder. The controller may learn the delivery delay for each cylinder via the intake oxygen sensor based on the amount and timing of the dilution after the pulsed manifold water injection. Therefore, the amount and timing of water injection relative to cylinder intake valve timing can be adjusted...

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Abstract

The invention relates to method and system for pulsed engine water injection. Methods and systems are provided for learning a transport delay for individual cylinders that is associated with maldistribution of water among cylinders during a water injection event. Differences in knock intensity between individual cylinders, following a water injection, are used to identify water maldistribution. Differences in the amount and timing of an engine dilution effect following a manifold water injection are learned via an intake oxygen sensor and used to reduce cylinder-to-cylinder imbalance in waterdelivery.

Description

technical field [0001] The present invention generally relates to methods and systems for injecting water into an engine and adjusting engine operation based on the water injection. Background technique [0002] Internal combustion engines may include water injection systems that inject water into a variety of locations, including the intake manifold upstream of the engine cylinders, or directly into the engine cylinders. Injecting water into the engine intake can increase fuel economy and improve engine performance, as well as reduce engine emissions. When water is injected into the engine intake or cylinders, heat is transferred from the intake air and / or engine components to the water. This heat transfer causes evaporation, which causes cooling. Injecting water into the intake air (eg, in the intake manifold) reduces intake air temperature and combustion temperature at the engine cylinders. By cooling the intake charge, the tendency to knock can be reduced without enri...

Claims

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Application Information

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IPC IPC(8): F02D43/00F02M25/028F02B47/02
CPCF02B47/02F02D35/027F02D37/02F02D41/0002F02D41/0025F02M25/0227F02M25/028F02D2200/101F02D2200/021F02D2200/0406F02D2200/0414F02D2200/0802F02D2041/001F02D41/0085F02D41/009F02D41/144F02D41/1456F02D41/2451F02D41/2467F02D19/12F02M35/104F02M35/10393
Inventor M·麦奎林D·A·马克莱德M·哈基姆G·苏尼拉
Owner FORD GLOBAL TECH LLC
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