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System and method for engine knock sensor rationality check

A knock sensor, engine technology, applied in engine components, combustion engines, engine ignition, etc., can solve the problems of knock sensor degradation, erroneous diagnosis, inability to distinguish knock events, knock events, etc.

Pending Publication Date: 2019-07-12
FORD GLOBAL TECH LLC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Under these conditions, previous methods may lead to false diagnoses of knock sensor degradation
As another example, comparing knock energy to an experimentally determined threshold may fail to distinguish true knock events from falsely detected knock events, since a degraded knock sensor may Has a knock energy above the threshold

Method used

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  • System and method for engine knock sensor rationality check
  • System and method for engine knock sensor rationality check
  • System and method for engine knock sensor rationality check

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Embodiment Construction

[0013] The following description refers to the implementation of engine systems such as figure 1 Systems and methods for plausibility checking of knock sensors in the engine system shown). For example, knock sensor degradation may be determined by comparing the frequency response of the knock sensor to the time-matched frequency response of the onboard microphones, such as according to figure 2 Exemplary method and use image 3 An exemplary signal processing algorithm shown in . Spark timing may be adjusted in response to knock detection when it is determined that the knock sensor is plausible (e.g., a detected knock event is a real knock event), but when it is determined that the knock sensor is not degraded (e.g., detected When the detected knock event is a false knock event), the spark timing is not adjusted, as shown in Fig. 4 .

[0014] Go to attached image, figure 1 An example of cylinder 14 of internal combustion engine 10 is depicted, which may be included in vehi...

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PUM

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Abstract

The invention provides a system and method for engine knock sensor rationality check. The Method and system are provided for rationalizing an engine knock sensor. In one example, a method may include,responsive to an indication of an engine knock event, correlating an output of the engine knock sensor with an output of an on-board microphone to determine degradation of the engine knock sensor. Byrationalizing the engine knock sensor against another on-board sensor (e.g., the on-board microphone), diagnostic fidelity may be increased.

Description

technical field [0001] The present description generally relates to methods and systems for determining knock sensor degradation. Background technique [0002] Engine knock is caused by the spontaneous combustion of an air / fuel mixture in an engine cylinder (eg, a combustion chamber) outside of the combustion front of an ignition event (eg, from a spark plug). As an example, carbon buildup within a cylinder may increase the cylinder's compression ratio, resulting in an increased tendency to knock. Knock sensors may be used to identify knock so that engine controllers may employ various strategies to mitigate knock, such as by adjusting (eg, retarding) spark timing. The knock sensor may be a passive piezoelectric device that outputs a voltage, for example, in response to received acoustic vibrations. A high amplitude knock sensor output in the knock frequency band may indicate a knock event. However, since strategies to reduce engine knock can degrade engine performance, r...

Claims

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Application Information

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IPC IPC(8): G01L25/00G01L23/22G01M15/12
CPCG01L23/221G01L25/00G01M15/12F02D35/027F02D41/042F02D41/222F02D2041/286F02D2200/025F02P5/1526Y02T10/40
Inventor 艾德·杜道尔
Owner FORD GLOBAL TECH LLC