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On-board method and system for monitoring onset of rapid oil oxidation and sludge formation in engine oils

An engine oil, engine technology, applied in the field of diagnostic systems, can solve problems such as fuel pollution

Inactive Publication Date: 2015-04-01
GM GLOBAL TECH OPERATIONS LLC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, changes in viscosity may be caused by more than oil deterioration, for example by loading another oil of a different viscosity, or by fuel contamination in the oil from repeated operations at lower temperatures

Method used

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  • On-board method and system for monitoring onset of rapid oil oxidation and sludge formation in engine oils
  • On-board method and system for monitoring onset of rapid oil oxidation and sludge formation in engine oils
  • On-board method and system for monitoring onset of rapid oil oxidation and sludge formation in engine oils

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Embodiment Construction

[0111] The following description of the embodiments is merely exemplary (schematic) in nature and is not intended to limit the invention, its application or uses.

[0112] Exemplary embodiments may provide a method and system for monitoring the occurrence of rapid oil oxidation and sludge formation in engine oil using viscosity-based engine oil diagnostics.

[0113] More specifically, exemplary embodiments may utilize an on-board method, time-based engine oil viscosity, to determine the end of the useful life of the engine oil. According to an exemplary embodiment, this time-based engine oil viscosity can be expressed and measured by utilizing one or both of two independent viscosity hysteresis phenomena, the so-called hysteresis magnitude and sign, which can then be used to predict or calculate oil The degree of deterioration and the precursors to the appearance of residues.

[0114] The hysteresis of a material property usually means that its value depends not only on the s...

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Abstract

In one exemplary embodiment, the state of engine oil degradation is monitored and determined using the size of viscosity hysteresis during heating-cooling cycles. In another exemplary embodiment, the state of engine oil degradation is monitored and determined using the sign of viscosity hysteresis during heating-cooling cycles. In yet another exemplary embodiment, the state of engine oil degradation is monitored and determined using relative viscosity changes hysteresis during heating-cooling cycles.

Description

technical field [0001] The present invention relates generally to a diagnostic system, and more particularly to an on-board method and system for monitoring engine oil. Background technique [0002] Engine oil deteriorates in normal use due to a number of mechanisms. One of these is oxidation and nitration due to oil exposure to high temperature oxygen and combustion gases in the combustion chamber and sump. Another way involves contamination of the oil with combustion by-products. The rate of oil degradation may depend on engine operating conditions, ambient temperature, engine design, and oil quality. If the oil is exposed to engine operating conditions beyond a certain point, the rate of oil degradation will likely increase rapidly so that the products of sludge formation begin to deposit on the surfaces of the engine. It is the vehicle manufacturer's goal to maximize oil change intervals for the environment and consumer cost / convenience while ensuring that the oil doe...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N11/00
CPCG01N2011/0093G01N33/2888
Inventor I·C·哈拉莱E·W·施奈德R·M·奥尔里D·R·斯塔利
Owner GM GLOBAL TECH OPERATIONS LLC