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Method for preventing engine cylinder scoring

An engine and engine output technology, applied in engine control, engine components, machines/engines, etc., can solve difficult problems such as intake air temperature, engine oil temperature, cylinder scuffing, intake air temperature, and water temperature rise

Active Publication Date: 2016-05-18
WEICHAI POWER CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The technical problem to be solved by the present invention is: in the existing method of preventing cylinder scuffing by limiting the torque, it is difficult to timely and effectively control parameters such as intake air temperature, water temperature, and engine oil temperature. Cylinder scuffing; especially when the engine intercooler, thermostat suddenly blocked, fan failure, or oil leakage, the intake air temperature and water temperature will rise sharply in a short time, and the engine is prone to scuffing in a short time; therefore, it is necessary to Provide a method that can effectively prevent the engine from scuffing

Method used

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  • Method for preventing engine cylinder scoring

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Embodiment 1

[0033] This embodiment provides a method for preventing the engine from scuffing, such as figure 1 As shown, step S1 is included to detect the performance parameters of the engine and compare them with preset standard parameters to determine whether the engine is in an abnormal working state. Preferably, the detected performance parameters are the intake air temperature of the engine, and the intake air The temperature is the temperature value collected by the first temperature sensor after the throttle valve in the natural gas engine. The first temperature sensor is close to the intake manifold. When the first temperature sensor is normal, it can accurately reflect the intake air temperature of the engine; When the air temperature is high, the electronic control unit judges whether the first temperature sensor installed behind the engine throttle is normal according to the obtained first temperature sensor voltage signal and internal diagnostic logic; when the first temperatur...

Embodiment 2

[0038] The technical solution of this embodiment is substantially the same as that of Embodiment 1, and the main difference is that the engine energy parameter measured in this embodiment is water temperature (ie: engine temperature), such as figure 2 As shown, the specific steps are: S1, detect the engine water temperature, wherein the engine water temperature is measured by the second temperature sensor, and when detecting the engine water temperature, the electronic control unit obtains the voltage signal of the second temperature sensor and the internal diagnostic logic to judge whether the second temperature sensor is normal; when the second temperature sensor is normal, the electronic control unit obtains the water temperature of the engine according to the voltage value measured by the second temperature sensor, and compares the obtained water temperature with the preset standard water temperature to judge whether the engine Whether it is in an abnormal working state; w...

Embodiment 3

[0043] This embodiment is substantially the same as the technical solution in Embodiment 1, and its main requirement is that the engine performance parameter measured in this embodiment is the oil level, such as image 3 As shown, the specific steps are: S1, detect the oil level in the engine, wherein the engine oil level is measured by a liquid level sensor, and when detecting the engine oil level, the electronic control unit obtains the oil level according to the liquid level sensor The voltage signal of the liquid level sensor and the internal diagnostic logic are used to judge whether the liquid level sensor is normal; when the liquid level sensor is normal, the electronic control unit obtains the engine oil level according to the voltage value measured by the liquid level sensor, and compares the obtained oil level with the preset value. Compared with the set standard oil level, it is judged whether the engine is in an abnormal working state; when the liquid level sensor f...

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Abstract

The invention relates to the technical field of automobiles, in particular to a method for preventing engine cylinder scoring. According to the method for preventing engine cylinder scoring, whether an engine fails or not is judged by measuring performance parameters of the engine; when it is judged that the engine fails according to the performance parameters of the engine, the output torque of the engine is limited first; and after the output torque of the engine is reduced, when the abnormal situation of the engine is still not improved or eliminated, the engine is directly turned off. According to the method, the situation that the gas inlet temperature, water temperature and lubrication situations of the engine become abnormal within a short period of time due to burst problems such as intercooler and throttle valve blockage, fan faults and engine oil leakage is considered, and it is effectively avoided that cylinder scoring happens when this type of situations happen to the engine.

Description

technical field [0001] The invention relates to the technical field of automobiles, in particular to a method for preventing engine cylinder scuffing. Background technique [0002] Cylinder scuffing is one of the common faults of the engine. It means that the inner wall of the engine cylinder is pulled into deep grooves, and the piston and piston ring lose the sealing when they rub against the cylinder wall, resulting in a decrease in cylinder compression pressure, loss of power, and flammable mixture. The downward movement will increase the pressure of the crankcase. In severe cases, it will cause the crankcase to explode, the oil will go up into the cylinder, causing oil burning, abnormal engine noise, and the engine will not work normally or even turn off, and cannot start normally. [0003] The common reasons for this are not only engine pistons, cylinders and other components that are damaged and deformed due to improper assembly or long-term use, but also external fact...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F02B77/08F02D39/00
CPCF02B77/08F02D39/00F02D2200/02F02D2250/26
Inventor 曹石宋增凤吴速超王学鹏
Owner WEICHAI POWER CO LTD
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