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Method and system for engine knock detection

An engine and detonation technology, which is applied in combustion engines, engine control, machines/engines, etc., can solve the problems of incorrectly indicating engine knocking and failing to observe engine knocking, and achieve accurate indication, improved signal-to-noise ratio, and improved Detection effect

Pending Publication Date: 2020-05-05
FORD GLOBAL TECH LLC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, if the knock sensor is degraded or if the engine knock background noise level varies or changes due to the engine, the control system cannot observe engine knock, or the control system may falsely indicate engine knock

Method used

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  • Method and system for engine knock detection
  • Method and system for engine knock detection
  • Method and system for engine knock detection

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Embodiment Construction

[0012] The following description relates to systems and methods for operating an engine including a knock control system. The engine can be Figure 1A to Figure 1C type shown in . can be based on Figure 2 to Figure 4 way to operate the engine. The method may increase the chances of learning the background noise level of engine knock so that detection of engine knock may be improved. Additionally, the method may improve engine knock detection in the presence of engine knock sensor degradation. Figure 5 to Figure 8 The engine operating sequence is at least partially shown in Figure 2 to Figure 4 Methods. It should be noted that this description is not limited to the particular embodiments shown herein and that it may apply to engines containing fewer or more engine cylinders.

[0013] Turning now to the attached drawings, Figure 1A An example of a cylinder 14 of an internal combustion engine 10 that may be included in a vehicle 5 is depicted. Engine 10 may be controll...

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Abstract

The invention provides a method and system for engine knock detection. Methods and systems are disclosed for operating an engine that includes a knock control system. The method and system may increase opportunities to learn one or more engine knock background noise levels via changing poppet valve timing and / or fuel injection timing. The method and system may also improve knock detection if knocksensor degradation is suspected.

Description

technical field [0001] The present application relates to methods and systems for learning engine knock background noise levels. Background technique [0002] Engines may include engine knock control systems to increase engine efficiency and reduce the likelihood of engine degradation. The knock control system may include a knock sensor that senses vibrations of the engine block. The knock control system can observe a specific frequency output from the knock sensor to determine if engine knock is present. Engine knock, or deflagration, can occur during a cylinder cycle when exhaust gases within the cylinder ignite before the flame front created by the spark ignites the exhaust gases. Exhaust ignition due to higher cylinder temperatures and pressures may stimulate vibrations in the engine block, which can be detected via knock sensors. The knock system may determine the presence of engine knock based on the output of the knock sensor and the background engine knock noise l...

Claims

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Application Information

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IPC IPC(8): G01L23/22
CPCG01L23/221F02D13/0203F02D13/06F02D19/084F02D35/027F02D41/0025F02D41/1497F02D41/222F02D41/2474F02D41/345F02D2200/025F02D2250/14Y02T10/30Y02T10/40F02D13/0215F02D41/1401F02D41/30
Inventor 兰尼·基万克里斯多夫·保罗·格鲁格拉穆罕纳德·哈基姆埃米·卡尔尼克詹姆斯·马修·金德利
Owner FORD GLOBAL TECH LLC