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Method and system for engine control

A technology of engine and engine load, applied in the direction of engine control, electric engine control automatic control, automatic control, etc., can solve problems such as low compression ratio and compression ratio availability limitation, achieve fuel economy and engine performance improvement, and reduce pumping Loss, the effect of improving fuel economy

Active Publication Date: 2021-10-22
FORD GLOBAL TECH LLC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Also, even in part load operation, the cylinder bank with the lower compression ratio may still have to be selectively activated due to knock constraints
This is because the compression ratio is limited by the availability of high octane fuel needed to prevent combustion deflagration or knocking at moderate to high engine loads

Method used

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  • Method and system for engine control
  • Method and system for engine control
  • Method and system for engine control

Examples

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Embodiment Construction

[0013] The following description relates to systems and methods for improving fuel economy in engines configured with individual cylinder valve deactivation mechanisms and pistons whose displacement within a combustion chamber can be varied. as reference Figure 1 to Figure 2 The engine system described by Selective Cylinder Deactivation allows the engine displacement to be varied, while variable piston displacement allows the compression ratio of each cylinder to be varied. The engine controller can be configured to execute control routines such as image 3 routines to vary the number of active cylinders of the engine based on engine load, and continuously adjust the compression ratio of the active cylinders to reduce knock and delay the use of spark retard. The controller can coordinate knock mitigation with changes in cylinder deactivation and changes in spark timing via compression ratio adjustments, as ref. Figure 4 An example operation is shown.

[0014] figure 1 An...

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Abstract

The present invention relates to methods and systems for engine control. Methods and systems are provided for coordinating cylinder deactivation adjustments with changes in individual cylinder piston displacements. In doing so, the benefits of variable displacement and variable compression ratio can be synergized. The engine is able to operate with some cylinders deactivated while active cylinders operate with knock resolved while spark timing is at MBT for longer durations.

Description

technical field [0001] The present invention generally relates to methods and systems for controlling engine compression ratio in engine systems configured with adjustable piston displacement. Background technique [0002] The engine may be configured to operate with a variable number of active or deactivated cylinders to increase fuel economy while optionally maintaining a total exhaust air-fuel ratio about stoichiometry. Among other things, a portion of engine cylinders may be deactivated during selected conditions defined by parameters such as speed / load windows, as well as various other operating conditions, including vehicle speed. An engine control system may disable a selected bank of cylinders (eg, a bank of cylinders) by controlling multiple cylinder valve deactivators that affect the operation of a cylinder's intake and exhaust valves, and controlling multiple cylinder valve deactivators that affect cylinder fueling. fuel injectors that can be selectively deactiva...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F02D15/02F02D17/02F02P5/152F01L9/20
CPCF02D15/02F02D17/02F02P5/1522F02D41/22F02B75/04F02D13/0207F02D13/06F02D35/027F02D37/02F02D2200/0625F02D2200/101F01L13/0005F01L2013/001F02D41/0087F02P5/045F02P17/12F02P2017/128Y02T10/12Y02T10/40F02D35/00F02D35/0007F02D41/005F02D41/0077F02D41/021F02D41/1456F02D41/2406F02D41/26F02M35/10393F01L9/20F02B75/048F02B77/085F02D11/02
Inventor C·P·格鲁格拉
Owner FORD GLOBAL TECH LLC