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Method and system for determining piston slap

A piston and operation method technology, applied in electrical control, rapid measurement changes, instruments, etc., can solve the problems of identifying piston knocking, difficult to predict engine piston knocking, and difficult to take mitigation measures, so as to reduce the audible piston knocking effects of rattling noise, retarded spark timing, and increased engine idle speed

Pending Publication Date: 2020-03-20
FORD GLOBAL TECH LLC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

While it may be desirable to avoid the noise produced by piston rattle, it can also be difficult to predict whether piston rattle will occur in a particular engine
Also, it may be difficult to discern piston rattle from other engine noises
Therefore, it may be difficult to take mitigation measures to avoid piston rattle

Method used

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  • Method and system for determining piston slap
  • Method and system for determining piston slap
  • Method and system for determining piston slap

Examples

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Embodiment Construction

[0011] The following description relates to systems and methods for operating an engine including a knock control system. engine can be Figure 1A-Figure 1C type shown in . can be based on Figure 2-Figure 4 method of operating the engine. The method may adjust operation of a knock control system to improve piston rattle detection and mitigation. In one example, the system may adjust the timing or crankshaft angle at which the knock window opens and closes in order to improve detection of piston rattle. The method can be as Figure 5-Figure 7 The operations shown in the sequence.

[0012] Now back to the attached picture, Figure 1A An example of cylinder 14 of internal combustion engine 10 that may be included in vehicle 5 is depicted. Engine 10 may be controlled at least partially by a control system including controller 12 and by input from a human vehicle operator 130 via an input device 132 . In this example, input device 132 includes an accelerator pedal and a ped...

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PUM

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Abstract

The disclosure provides a method and a system for determining a piston slap. Methods and systems are disclosed for operating an engine that includes a knock control system. The methods and system provide for repurposing the engine knock control system to detect and mitigate piston slap. The methods and systems also seek to increase the signal to noise ratio for detecting piston slap.

Description

technical field [0001] The present application relates to methods and systems for determining the presence or absence of piston rattling noise in an engine. Background technique [0002] There may be a small gap between the walls of a cylinder of an internal combustion engine and a piston located within the cylinder. Small gaps can be related to gaps between parts, manufacturing part variations, different materials expanding and contracting at different rates, and other reasons. Also, if the engine is started and idling at cold temperatures, the small gap may increase in size as the engine ages, the engine's pistons may shift from side to side and therefore hit the walls of the cylinders so that the resulting The knocking noise known as piston rattle. If the engine is operated and it reaches nominal operating temperature, the heat within the engine can expand the piston and piston rings so that the clearances decrease and the rattling noise stops. While it may be desirabl...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F02D35/02
CPCF02D35/02F02D35/027F02D31/001F02D37/02F02D2250/14G01L23/221F02D41/062F16F15/24
Inventor 克里斯多夫·P·格鲁格拉兰尼·基万穆罕纳德·哈基姆唐纳德·J·刘易斯
Owner FORD GLOBAL TECH LLC