CN103884510A

CN103884510A - Method for detection of correlation between blow-by abnormity of engine and supercharger

Info

Publication number: CN103884510A
Application number: CN201410134493.8A
Authority: CN
Inventors: 梁哲; 何炳才
Original assignee: Guangxi Yuchai Machinery Co Ltd
Current assignee: Guangxi Yuchai Machinery Co Ltd
Priority date: 2014-04-02
Filing date: 2014-04-02
Publication date: 2014-06-25
Anticipated expiration: 2034-04-02
Also published as: CN103884510B

Abstract

The invention discloses a method for detection of the correlation between blow-by abnormity of an engine and a supercharger. The method comprises the following steps that the engine with a failure is started, and the blow-by amount of the engine is detected through a detection device and serves as the first blow-by amount; the engine is stopped, an oil return pipe of the supercharger of the engine is pulled out of an oil return hole, and then the oil return hole is blocked through a plug; the engine is started again, and the blow-by amount of the engine is detected through the detection device and serves as the second blow-by amount; the correlation between the blow-by abnormity of the engine and the supercharger is judged, and if the second blow-by amount is smaller than the first blow-by amount, it is determined that the blow-by abnormity of the engine is related to gas leakage of the supercharger; otherwise, it is determined that the blow-by abnormity of the engine is unrelated to gas leakage of the supercharger, and then the wear conditions of a piston ring and a cylinder sleeve of the engine are checked. According to the method, by means of changing the failure removal order, the correlation between the blow-by abnormity of the engine and gas leakage of the supercharger is judged rapidly, the failure handing speed can be increased, and production efficiency can be improved.

Description

The detection method of the correlativity of the abnormal and supercharger of the gas blowby of engine

Technical field

The present invention relates to engine art, particularly the detection method of the correlativity of the abnormal and supercharger of a kind of gas blowby of engine.

Background technology

Engine blow-by gas extremely directly affects the performance of engine, and air leak amount off technical requirement can cause engine output to decline, and the oil consumption of machine oil exceeds standard, and causes the adverse consequencess such as environmental pollution.Engine blow-by gas has many reasons extremely, and first maintenance personal can judge whether main cause is the wearing and tearing of engine piston ring and cylinder sleeve.But need to disintegrate engine, complicated operation, takes time and effort.

It is another kind of reason that supercharger internal gas leaks, when turbocharger operation, pneumatic plant end air pressure, turbine end gaseous-pressure are different from lubricating oil pressure in bearing body, therefore, between pneumatic plant and bearing and can have the phenomenon of the mutual seepage of oil gas between turbine and bearing body, the gas leaking from supercharger enters in engine by the scavenge pipe of supercharger, has caused engine blow-by gas abnormal, but this reason is more hidden, be difficult for discovering.

The order of fixing a breakdown in prior art has reduced fault detect efficiency, and cannot clearly judge the reason of the Leakage Gas except the wearing and tearing of engine piston ring and cylinder sleeve.

The information that is disclosed in this background technology part is only intended to increase the understanding to general background of the present invention, and should not be regarded as admitting or imply that in any form this information structure has been the known prior art of persons skilled in the art.

Summary of the invention

The object of the present invention is to provide the detection method of the correlativity of the abnormal and supercharger of a kind of gas blowby of engine, thereby overcome the shortcoming that cannot clearly judge the reason of the Leakage Gas except the wearing and tearing of engine piston ring and cylinder sleeve.

For achieving the above object, the invention provides the detection method of the correlativity of the abnormal and supercharger of a kind of gas blowby of engine, detection method comprises the steps: to start the engine breaking down, and detects the air leak amount of engine, as the first air leak amount by checkout equipment; Stop engine, the scavenge pipe of the supercharger of engine is extracted from spill port, then spill port is stopped up with plug; Starting engine again, detects the air leak amount of engine, as the second air leak amount by checkout equipment; Judge the abnormal correlativity with supercharger of engine blow-by gas, if the second air leak amount is less than the first air leak amount, judge that engine blow-by gas is extremely relevant with the Leakage Gas of supercharger; Otherwise judge that engine blow-by gas Leakage Gas abnormal and supercharger is irrelevant, the abrasion condition of engine piston ring and cylinder sleeve is checked.

In technique scheme, judge that the step of the correlativity of the abnormal and supercharger of engine blow-by gas also comprises: extremely mainly caused by the Leakage Gas of supercharger if the second air leak amount within the scope of the standard air leak amount of engine, is judged engine blow-by gas; If the second air leak amount is less than the first air leak amount, but the second air leak amount is not within the scope of the standard air leak amount of engine, the Leakage Gas of judging supercharger is not the abnormal sole cause of engine blow-by gas, the abrasion condition of engine piston ring and cylinder sleeve is checked.

Compared with prior art, the present invention has following beneficial effect:

The present invention gets rid of order by mapping fault, engine is being disintegrated, before checking the abrasion condition of engine piston ring and cylinder sleeve, by pulling out the scavenge pipe of supercharger, the method of the air leak amount of comparison engine, judge fast engine blow-by gas extremely and the correlativity of supercharger Leakage Gas, can accelerate fault handling speed, enhance productivity.。

Brief description of the drawings

Fig. 1 is the process flow diagram according to determination methods of the present invention.

Embodiment

Below in conjunction with accompanying drawing, the specific embodiment of the present invention is described in detail, but is to be understood that protection scope of the present invention is not subject to the restriction of embodiment.

Unless separately there is other clearly to represent, otherwise in whole instructions and claims, term " comprises " or its conversion was stated being understood to include as " comprising " or " including " etc. element or ingredient, and do not get rid of other element or other ingredient.

As shown in Figure 1, whether supercharger Leakage Gas of the present invention is that the method for the abnormal main cause of engine blow-by gas comprises the steps:

Start the engine breaking down, detect the air leak amount of engine by checkout equipment, as the first air leak amount;

Stop engine, the scavenge pipe of engine supercharger is extracted from spill port, then spill port is stopped up with plug;

Starting engine again, detects the air leak amount of engine, as the second air leak amount by checkout equipment;

Judge the correlativity of the abnormal and supercharger Leakage Gas of engine blow-by gas.If the second air leak amount is less than the first air leak amount, judge that engine blow-by gas is abnormal relevant with the Leakage Gas of supercharger; Otherwise judge that engine blow-by gas Leakage Gas abnormal and supercharger is irrelevant, the abrasion condition of engine piston ring and cylinder sleeve is checked.

Specifically, if within the scope of the standard air leak amount of engine, judging engine blow-by gas, the second air leak amount extremely mainly caused by the Leakage Gas of supercharger; If the second air leak amount is less than the first air leak amount, but the second air leak amount is not within the scope of the standard air leak amount of engine, the Leakage Gas of judging supercharger is not the abnormal sole cause of engine blow-by gas, the abrasion condition of engine piston ring and cylinder sleeve is checked.

The present invention gets rid of order by mapping fault, engine is being disintegrated, before checking the abrasion condition of engine piston ring and cylinder sleeve, by pulling out the scavenge pipe of supercharger, the method of the air leak amount of comparison engine, judge fast engine blow-by gas extremely and the correlativity of supercharger Leakage Gas, can accelerate fault handling speed, enhance productivity.

The aforementioned description to concrete exemplary of the present invention is in order to illustrate and the object of illustration.These descriptions not want the present invention to be defined as disclosed precise forms, and obviously, according to above-mentioned instruction, can much change and change.Exemplary embodiment is selected and the object described is to explain certain principles of the present invention and practical application thereof, thereby made those skilled in the art can realize and utilize various exemplary of the present invention and various selection and change.Scope of the present invention is intended to be limited by claims and equivalents thereof.

Claims

1. a detection method for the correlativity of the abnormal and supercharger of the gas blowby of engine, is characterized in that, described detection method comprises the steps:

Start the engine breaking down, detect the air leak amount of described engine by checkout equipment, as the first air leak amount;

Stop described engine, the scavenge pipe of the supercharger of engine is extracted from spill port, more described spill port is stopped up with plug;

Again start described engine, detect the air leak amount of described engine by checkout equipment, as the second air leak amount;

Judge the abnormal correlativity with supercharger of engine blow-by gas, if the second air leak amount is less than the first air leak amount, judge that engine blow-by gas is extremely relevant with the Leakage Gas of described supercharger; Otherwise judge that engine blow-by gas is abnormal irrelevant with the Leakage Gas of described supercharger, the abrasion condition of engine piston ring and cylinder sleeve is checked.

2. the detection method of the abnormal correlativity with supercharger of the gas blowby of engine according to claim 1, is characterized in that, described judgement engine blow-by gas extremely and the step of the correlativity of supercharger also comprise:

If described the second air leak amount within the scope of the standard air leak amount of engine, is judged engine blow-by gas and is extremely mainly caused by the Leakage Gas of described supercharger; If described the second air leak amount is less than described the first air leak amount, but described the second air leak amount is not within the scope of the standard air leak amount of engine, the Leakage Gas of judging described supercharger is not the abnormal sole cause of engine blow-by gas, the abrasion condition of engine piston ring and cylinder sleeve is checked.