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Method and system for pre-ignition control

A pre-ignition and compression ratio technology, applied in mechanical control, engine control, machine/engine, etc., can solve problems such as reduced fuel economy, increased residue, and aggravated pre-ignition

Active Publication Date: 2016-08-03
FORD GLOBAL TECH LLC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Adjustments made to reduce the compression ratio may adversely affect engine performance
As an example, fuel injection enrichment can degrade fuel economy, degrade exhaust emissions, and result in a lower possible torque reduction for enrichment than for RBT
Cam Timing Adjustments Can Also Cause Fuel Economy Losses
As another example, advancing the intake cam timing can result in a residual effect that ultimately exacerbates pre-ignition by increasing the residual

Method used

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  • Method and system for pre-ignition control
  • Method and system for pre-ignition control
  • Method and system for pre-ignition control

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Embodiment Construction

[0015] The following description relates to systems and methods for mitigating pre-ignition in an engine configured with a piston whose displacement within a combustion chamber is variable. as reference figure 1 As mentioned in the engine system, variable piston displacement enables the engine's compression ratio to vary. The engine controller can be configured to execute control routines such as figure 2 A routine to reduce the engine's compression ratio level from a nominal level to a first lower level based on the engine's pre-ignition propensity (determined from the engine's pre-ignition history). The controller may then further decrease the compression ratio level of the engine from the first level to the second level in response to the occurrence of pre-ignition. The controller can further coordinate pre-ignition mitigation through compression ratio reduction with other mitigation measures such as cylinder enrichment and load limiting, such as Figure 6 described in ...

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PUM

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Abstract

Methods and systems are provided for addressing pre-ignition by mechanically varying a piston displacement within a combustion chamber. In response to pre-ignition, a static compression ratio may be reduced until a threshold lower compression ratio is reached. Further pre-ignition is then addressed with enrichment, thereby reducing the amount of pre-ignition mitigating enrichment required overall.

Description

technical field [0001] The present description generally relates to methods and systems for controlling engine compression ratio in response to abnormal combustion in an engine system configured with adjustable piston displacement. Background technique [0002] Under certain operating conditions, an engine with a high compression ratio or boosted to increase a certain output may be prone to low speed abnormal combustion events, such as due to pre-ignition. Premature abnormal combustion due to pre-ignition causes extremely high in-cylinder pressure and can cause combustion pressure similar to combustion knock but with greater intensity. This abnormal combustion event can lead to rapid degradation of the engine. Accordingly, strategies have been developed to detect and mitigate abnormal combustion events in advance based on engine operating conditions. [0003] An example method is illustrated in US Patent No. 20110239986 by Shishime et al. Wherein, in response to an indica...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F02D15/02
CPCF02D15/02F02D2700/03F02D35/02F02D35/027F02D13/0269F02D15/04F02B75/04F02B2075/025
Inventor 克里斯·保罗·格卢格拉
Owner FORD GLOBAL TECH LLC