CN101650260A - Measures for diagnosing and preventing cylinder-knocking fault of diesel engine - Google Patents
Measures for diagnosing and preventing cylinder-knocking fault of diesel engine Download PDFInfo
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- CN101650260A CN101650260A CN200810021750A CN200810021750A CN101650260A CN 101650260 A CN101650260 A CN 101650260A CN 200810021750 A CN200810021750 A CN 200810021750A CN 200810021750 A CN200810021750 A CN 200810021750A CN 101650260 A CN101650260 A CN 101650260A
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Abstract
The invention relates to measures for diagnosing and preventing a cylinder-knocking fault of diesel engine. Based on the analysis of the type of and reasons for cylinder knocking of the engine duringoperation, the invention provides the measures for diagnosing and preventing the cylinder-knocking fault, which comprise: 1, setting the rotating speed of the diesel engine at a value at which the cylinder knocking is most powerful and testing by using a cylinder-based fuel cut method; 2, contacting and listening to the middle part of a cylinder body by using an auscultative rod and distinguishingsound; 3, detaching the cylinder cover, examining the carbon deposition in the combustion chamber and examining the thickness of a cylinder head gasket; 4, detaching the cylinder cover and examiningthe wear degree of the cylinder; 5, drawing a piston connecting rod set out, examining the fit clearance between the piston and the cylinder and between the piston pin and the piston pin hole; and 6,examining the bending and distortion conditions of the connecting rod.
Description
Affiliated technical field
The present invention relates to a kind of diesel motor engine knock fault diagnosis and preventive measure, analyzed the engine type of engine knock and the reason of engine knock at work, engine knock fault diagnosis and preventive measure are provided, help the reliability and the security of engine operation.
Background technology
The working environment of diesel motor is generally abominable than petrol engine, and output power is big, for various reasons, sends unusual engine knock sound in the firing chamber.The sound of diesel motor work is more rough, shakes also greatlyyer, must examine and can find engine knock, must just can diagnose by means of some simple diagnostic tools in case of necessity.Common engine knock type has: 1. engine cold-start engine knock; Engine knock when 2. engine quickens; 3. normal engine knock in working; 4. single cylinder engine knock; 5. multi-cylinder engine knock.Common engine knock reason: 1. piston and cylinder tolerance clearance are excessive; 2. the anti-or piston distortion of piston direction dress; 3. cylinder wall insufficient lubrication; 4. rod deformation; 5. oil leab stops up; 6. combustion-chamber deposit is serious; 7. injection advance angle is excessive; 8. burn too fast, in-cylinder pressure is too high; 9. head gasket is thin, ratio of compression is big.
Summary of the invention
The present invention's a kind of diesel motor engine knock fault diagnosis and preventive measure, according to different its reasons of engine knock type analysis, specific aim takes preventive measures, and eliminates the hidden danger of fault.Eliminating measure: 1. the rotating speed of diesel motor is fixed on and knocks on the loudest position, take by the test of cylinder oil-break method; 2. touch with the auscultation rod and listen the cylinder body middle part, the difference sound; 3. unload cylinder head, check combustion-chamber deposit, check head gasket thickness; 4. unload cylinder head, check the cylinder wear degree; 5. extract the piston rod group out, check piston and cylinder tolerance clearance, piston pin and piston pin hole tolerance clearance; 6. check bending, the torsional deformation situation of connecting rod.
Beneficial effect of the present invention is: in time fix a breakdown, strengthen the reliability and the security of engine operation.
Description of drawings
Accompanying drawing is an artwork of the present invention.
Embodiment
1. the analysis of causes of engine knock
1. because of wearing and tearing, the tolerance clearance of piston and cylinder is excessive;
2. the anti-or piston distortion of piston direction dress has destroyed the normal clearance that piston cooperates with cylinder, causes the piston knock sound;
3. cylinder wall insufficient lubrication, poor lubrication, engine oil pressure is low or engine oil viscosity is low excessively, and the cylinder wall spray lubrication is bad, can not form normal lubricating oil film between piston and the casing wall, and piston and engine knock are directly collided and engine knock;
4. connecting rod bending and torsional deformation;
5. oil leab stops up, and can not form normal pressure lubrication; Connecting rod bearing shell or piston pin cooperate tension, cause that sound takes place to produce bump with casing wall in the piston motion;
6. carbon deposit is serious in the firing chamber;
7. injection advance angle is excessive;
8. the combustion mixture burning rate is too fast, causes that in-cylinder pressure is too high, and the piston skirt is clashed into cylinder wall and the engine knock abnormal sound occurred;
9. head gasket cross thin or the grinding of cylinder body cylinder deck too much, cause engine compression ratio to increase, cause that engine knock appears in detonation.
2. diagnose and method for removing
1. the rotating speed of diesel motor is fixed on and knocks on the loudest position, take by the test of cylinder oil-break method; If this cylinder sound significantly weakens or eliminates, prove the piston knock cylinder wall;
2. touch with the auscultation rod and listen the cylinder body middle part, the difference sound;
3. unload atomizer,, drive engine crankshaft with starter motor and rotate several circles, make between piston and casing wall to be full of lubricating oil film, start diesel engine then from its mounting hole small amount of engine oil of in cylinder, annotating.If instantaneous sound after startup obviously weakens or disappears, but along with the loss or the ablation of oil film, sound can very fast appearance, and this cylinder engine knock is described;
4. unload cylinder head, check the carbon deposit situation of burning chamber of diesel engine, if combustion chamber deposit is too much, application machine or chemical method are removed;
5. unload cylinder head, check head gasket thickness, if head gasket is crossed thin or the cylinder body grinding is too much, the head gasket that should select thickening for use is to prevent excessively to reduce to make the ratio of compression increase because of combustion chamber volume.
6. unload head gasket, check, measure the degree of wear of cylinder,, should carry out more resleeve by repair specification if cylinder wear is excessive or damage;
7. extract the piston rod group out, detect bending, the torsional deformation situation of connecting rod.If distortion is transfinited, should cold pressing and proofread and correct or change;
8. answer the piston installation direction when assembling, dress instead can cause engine knock.
Claims (3)
1. diesel motor engine knock fault diagnosis and preventive measure is characterized in that: analyzed the engine type of engine knock and the reason of engine knock at work, engine knock fault diagnosis and preventive measure are provided.
2. a kind of diesel motor engine knock fault diagnosis according to claim 1 and preventive measure is characterized in that: common engine knock reason: 1. piston and cylinder tolerance clearance are excessive; 2. the anti-or piston distortion of piston direction dress; 3. cylinder wall insufficient lubrication; 4. rod deformation; 5. oil leab stops up; 6. combustion-chamber deposit is serious; 7. injection advance angle is excessive; 8. burn too fast, in-cylinder pressure is too high; 9. head gasket is thin, ratio of compression is big.
3. a kind of diesel motor engine knock fault diagnosis according to claim 1 and preventive measure is characterized in that: diagnosis and method for removing: 1. the rotating speed of diesel motor is fixed on and knocks on the loudest position, take by the test of cylinder oil-break method; If this cylinder sound significantly weakens or eliminates, prove the piston knock cylinder wall; 2. touch with the auscultation rod and listen the cylinder body middle part, the difference sound; 3. unload atomizer,, drive engine crankshaft with starter motor and rotate several circles, make between piston and casing wall to be full of lubricating oil film, start diesel engine then from its mounting hole small amount of engine oil of in cylinder, annotating.If instantaneous sound after startup obviously weakens or disappears, but along with the loss or the ablation of oil film, sound can very fast appearance, and this cylinder engine knock is described; 4. unload cylinder head, check the carbon deposit situation of burning chamber of diesel engine, if combustion chamber deposit is too much, application machine or chemical method are removed; 5. unload cylinder head, check head gasket thickness, if head gasket is crossed thin or the cylinder body grinding is too much, the head gasket that should select thickening for use is to prevent excessively to reduce to make the ratio of compression increase because of combustion chamber volume.6. unload head gasket, check, measure the degree of wear of cylinder,, should carry out more resleeve by repair specification if cylinder wear is excessive or damage.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200810021750A CN101650260A (en) | 2008-08-12 | 2008-08-12 | Measures for diagnosing and preventing cylinder-knocking fault of diesel engine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200810021750A CN101650260A (en) | 2008-08-12 | 2008-08-12 | Measures for diagnosing and preventing cylinder-knocking fault of diesel engine |
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| CN101650260A true CN101650260A (en) | 2010-02-17 |
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| CN200810021750A Pending CN101650260A (en) | 2008-08-12 | 2008-08-12 | Measures for diagnosing and preventing cylinder-knocking fault of diesel engine |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101865773B (en) * | 2010-02-01 | 2012-05-02 | 东风朝阳柴油机有限责任公司 | Simple whole machine diagnostic unit of electric control diesel engine |
| CN104122094A (en) * | 2014-07-29 | 2014-10-29 | 南通理工学院 | Abnormal sound fault diagnosis device and method for engine |
| CN104677637A (en) * | 2015-03-11 | 2015-06-03 | 句容五星机械制造有限公司 | Method for detecting large engine oil consumption amount of diesel engine |
| CN107677356A (en) * | 2017-09-26 | 2018-02-09 | 重庆长安汽车股份有限公司 | The method of engine body abnormal sound is differentiated using vibration characteristics |
| CN109238726A (en) * | 2018-07-02 | 2019-01-18 | 岭东核电有限公司 | A kind of qualification test method of pressurized-water reactor nuclear power plant diesel engine bush |
-
2008
- 2008-08-12 CN CN200810021750A patent/CN101650260A/en active Pending
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101865773B (en) * | 2010-02-01 | 2012-05-02 | 东风朝阳柴油机有限责任公司 | Simple whole machine diagnostic unit of electric control diesel engine |
| CN104122094A (en) * | 2014-07-29 | 2014-10-29 | 南通理工学院 | Abnormal sound fault diagnosis device and method for engine |
| CN104677637A (en) * | 2015-03-11 | 2015-06-03 | 句容五星机械制造有限公司 | Method for detecting large engine oil consumption amount of diesel engine |
| CN107677356A (en) * | 2017-09-26 | 2018-02-09 | 重庆长安汽车股份有限公司 | The method of engine body abnormal sound is differentiated using vibration characteristics |
| CN109238726A (en) * | 2018-07-02 | 2019-01-18 | 岭东核电有限公司 | A kind of qualification test method of pressurized-water reactor nuclear power plant diesel engine bush |
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Open date: 20100217 |