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Method and system for pre-ignition control

A technology of spark and spark advance, which is applied in the direction of electric spark ignition controller, electrical control, automatic control, etc., and can solve problems such as incorrect measures, degraded performance, and reduction

Active Publication Date: 2015-06-10
FORD GLOBAL TECH LLC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Overall, increases system complexity and cost without necessarily improving the performance of knock or pre-ignition detection in the cylinder
Therefore, the reduced accuracy of the determination of engine pre-ignition and its differentiation (from knock) can lead to rapid engine degradation
Also, the distinction between knock and pre-ignition can be inaccurate and lead to incorrect actions for each type of event, resulting in degraded performance

Method used

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  • Method and system for pre-ignition control

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Embodiment Construction

[0019] The following description refers to mitigations used in engines such as figure 1 A system and method for a super knock event caused by abnormal combustion in an engine system. The engine controller can be configured to execute control programs such as Figure 2-4 program) to perform one or more mitigation adjustments based on the output strength of the knock sensor signal generated during two partially overlapping crank angle timing windows. The controller may not perform any adjustments based on knock sensor signals generated outside of the defined window. Based on the output strength of the knock sensor signal generated in a first earlier of the two windows, the controller may adjust the amount of cylinder enrichment applied. as reference Figure 5-7 In further detail, based on the determined enrichment, the controller may further determine an amount of engine load limitation to apply and an amount of spark timing adjustment to apply. Based on the output strength ...

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Abstract

Methods and systems are provided for mitigating knock and / or pre-ignition. Each of a spark timing retard, cylinder enrichment, and engine load limiting is adjusted based on a knock sensor output generated in a single defined crank angle window, and not based on knock sensor output generated outside the defined crank angle window. A severity of the mitigating actions is adjusted in proportion to the knock sensor output intensity with the severity of the mitigating action increased as the knock sensor output intensity increases.

Description

[0001] Cross References to Related Applications [0002] This application claims priority to US Provisional Patent Application No. 61 / 912,370, filed December 5, 2013, entitled "METHOD AND SYSTEM FOR PRE-IGNITION CONTROL," the entire contents of which are incorporated herein by reference for all purposes. technical field [0003] The present description generally relates to methods and systems for controlling a vehicle engine in response to abnormal combustion. Background technique [0004] Under certain operating conditions, engines with high compression ratios or boosted to increase specific output may be prone to low speed abnormal combustion events, such as due to pre-ignition. Early abnormal combustion due to pre-ignition causes very high in-cylinder pressure and causes a combustion pressure wave similar to combustion knock but with greater intensity. Such abnormal combustion events can lead to rapid engine degradation. Accordingly, strategies have been developed for e...

Claims

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Application Information

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IPC IPC(8): F02D43/00F02P5/04
CPCF02D35/027F02D37/02F02D41/0002F02D41/008F02D41/1401F02D41/1497F02D41/1498F02D41/402F02D2041/1418F02D2041/389F02D2200/101F02P5/045F02P5/152G01L23/221Y02T10/40
Inventor C·P·格卢格拉R·S·巴斯肯斯J·M·金德里C·R·韦伯
Owner FORD GLOBAL TECH LLC