CN115163305A - Diesel engine crankcase pressure monitoring method - Google Patents
Diesel engine crankcase pressure monitoring method Download PDFInfo
- Publication number
- CN115163305A CN115163305A CN202210607995.2A CN202210607995A CN115163305A CN 115163305 A CN115163305 A CN 115163305A CN 202210607995 A CN202210607995 A CN 202210607995A CN 115163305 A CN115163305 A CN 115163305A
- Authority
- CN
- China
- Prior art keywords
- pressure
- diesel engine
- crankcase
- emergency stop
- monitoring method
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 238000000034 method Methods 0.000 title claims abstract description 14
- 238000012544 monitoring process Methods 0.000 title claims abstract description 14
- 230000009471 action Effects 0.000 claims description 19
- 230000008859 change Effects 0.000 description 5
- 230000004075 alteration Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 239000003595 mist Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
- F02B77/00—Component parts, details or accessories, not otherwise provided for
- F02B77/08—Safety, indicating, or supervising devices
- F02B77/10—Safety means relating to crankcase explosions
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
- F02B77/00—Component parts, details or accessories, not otherwise provided for
- F02B77/08—Safety, indicating, or supervising devices
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D45/00—Electrical control not provided for in groups F02D41/00 - F02D43/00
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/10—Internal combustion engine [ICE] based vehicles
- Y02T10/40—Engine management systems
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Combined Controls Of Internal Combustion Engines (AREA)
Abstract
The invention discloses a diesel engine crankcase pressure monitoring method, which converts the crankcase pressure into a current signal, the crankcase pressure and the current signal are in a direct proportion relation, an ECU receives the current signal and then judges the corresponding pressure range, and the pressure value is respectively compared with the normal crankcase pressure P n Rated pressure value P c And a safety pressure value P s The comparison, send the order to the emergency stop device at last to the running state of control diesel engine, this diesel engine crankcase pressure monitoring method can carry out real-time supervision to the pressure in the crankcase, and judge whether its pressure variation needs emergency stop, avoids causing the unnecessary loss, provides the safety guarantee to machine and staff's safety.
Description
Technical Field
The invention relates to the technical field of diesel engines, in particular to a pressure monitoring method for a crankcase of a diesel engine.
Background
When the diesel engine normally operates, under the action of high-pressure and high-temperature gas, part of gas enters the crankcase through the gas ring and the oil ring, under general conditions, the gas enters the atmosphere through the vent pipe, dynamic balance is generated between the gas and the outside, the pressure of the crankcase is kept stable, but if piston ring damage or piston ring and cylinder sleeve transitional wear occurs, the pressure of the crankcase is easily increased suddenly, at the moment, the diesel engine continues to operate, too much gas enters the crankcase, crankshaft oil mist gas is easily ignited, mixed gas in the crankcase is caused to explode, and safety of personnel and other equipment is harmed.
When traditional crankcase pressure sensor detects crankcase pressure and surpasses the setting value, direct trigger diesel engine emergency shut down to the accident enlarges, but sometimes the crankcase pressure is too high, probably because other gas contingencies such as intake pipe or cylinder head get into the crankcase and make crankcase pressure change instantaneously, leads to the diesel engine emergency stop, destroys work continuity and stability, has accelerated equipment wearing and tearing, threatens staff's life even, causes irreparable economic loss.
Disclosure of Invention
The invention aims to overcome the defects in the prior art, and provides a pressure monitoring method for a crankcase of a diesel engine, which can monitor the pressure in the crankcase in real time, judge whether the pressure change needs emergency stop or not, avoid unnecessary loss and influence on the normal operation of a machine, and can effectively solve the problems in the background art.
In order to achieve the purpose, the invention provides the following technical scheme: a pressure monitoring method for a crankcase of a diesel engine comprises the steps of converting the pressure of the crankcase into a current signal, judging a corresponding pressure range of the current signal after the current signal is received by an ECU (electronic control Unit), and respectively comparing the pressure value with a normal crankcase pressure P n Rated pressure value P c And a safety pressure value P s And finally, sending an instruction to the emergency stop device to control the running state of the diesel engine.
In a preferred embodiment of the present invention, the crankcase pressure and the current signal are in a direct relationship.
As a preferred aspect of the invention, if the crankcase pressure is greater than P n And is less than P c The pressure of the crankcase is inversely proportional to the action time of emergency stop, and an alarm signal is sent out, if the specified time is exceeded, the pressure of the crankcase is still not reduced to the normal pressure, the diesel engine is operated in load reduction, and after a period of time, the load is reducedThe diesel engine can not be recovered to normal, and the diesel engine can be immediately and emergently stopped.
As a preferred aspect of the invention, if the crankcase pressure is greater than P c And is less than P s The emergency stop is carried out for a long pending action time T c Is a constant value, T c Far shorter than the alarm time of the pressure of the long undetermined crankcase of the diesel engine, and if the fault time of the diesel engine is longer than the long undetermined action time T of emergency stop c And the diesel engine is emergently stopped.
As a preferred technical scheme of the invention, if the crankcase pressure is more than P s Short pending action time T for emergency stop s Is a constant value, T s Is less than the long pending action time T of the emergency stop of the diesel engine c If the failure time of the diesel engine is longer than the short pending action time T of the emergency stop s And the diesel engine is emergently stopped.
Compared with the prior art, the invention has the beneficial effects that: the diesel engine crankcase pressure monitoring method replaces the traditional pressure detection method, changes of pressure in the crankcase are converted into current signals, changes of pressure in the crankcase can be continuously monitored, and the generated current signals correspond to pressure values in a set interval and are equal to normal crankcase pressure P n Rated pressure value P c And a safety pressure value P s And comparing, judging whether the emergency stop is a necessary emergency stop or a non-necessary emergency stop, reducing the loss caused by unnecessary stop, and simultaneously ensuring the life safety of workers.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The invention provides a technical scheme that: a method for monitoring the pressure of crankcase in diesel engine features that the pressure of crankcase is converted into current signal, the pressure and current of crankcaseThe signal is in direct proportion, the ECU judges the corresponding pressure range after receiving the current signal, and respectively compares the pressure value with the normal crankcase pressure P n Rated pressure value P c And a safety pressure value P s And finally, sending an instruction to the emergency stop device to control the running state of the diesel engine.
If the crankcase pressure is greater than P n And is less than P c The pressure of the crankcase is in inverse proportion to the action time of emergency stop, and an alarm signal is sent out, if the pressure of the crankcase is not reduced to the normal pressure after the specified time is exceeded, the load of the diesel engine is reduced, the diesel engine cannot be recovered to be normal after a period of time, and the diesel engine immediately emergently stops;
if the crankcase pressure is greater than P c And is less than P s The emergency stop is carried out for a long pending action time T c Is a constant value, T c Far shorter than the alarm time of the pressure of the long undetermined crankcase of the diesel engine, if the fault time of the diesel engine is longer than the long undetermined action time T of the emergency stop c The diesel engine is stopped emergently;
if the crankcase pressure is greater than P s Short pending action time T for emergency stop s Is a constant value, T s Less than the long undetermined action time T of the emergency stop of the diesel engine c If the fault time of the diesel engine is longer than the short pending action time T of the emergency stop s And the diesel engine is emergently stopped.
The invention converts the pressure change in the crankcase into the current signal, can continuously monitor the pressure change in the crankcase, and avoids the emergency stop of the diesel engine caused by unnecessary emergency stop factors by judging whether the pressure change belongs to the necessary emergency stop and the unnecessary emergency stop, thereby ensuring the continuity and stability of the work, ensuring the life safety of workers, reducing the economic loss and greatly improving the use convenience.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (5)
1. A diesel engine crankcase pressure monitoring method is characterized in that: the pressure of the crankcase is converted into a current signal, the ECU judges the corresponding pressure range of the current signal after receiving the current signal, and the pressure value is respectively equal to the normal crankcase pressure P n Rated pressure value P c And a safety pressure value P s And finally, sending an instruction to the emergency stop device to control the running state of the diesel engine.
2. The diesel engine crankcase pressure monitoring method according to claim 1, characterized in that: the crankcase pressure and the current signal are in a direct proportion relation.
3. The diesel engine crankcase pressure monitoring method according to claim 1, characterized in that:
if the crankcase pressure is greater than P n And is less than P c The pressure of the crankcase is inversely proportional to the action time of emergency stop, and an alarm signal is sent out, if the specified time is exceeded, the pressure of the crankcase is still not reduced to the normal pressure, the load of the diesel engine is reduced, the diesel engine cannot be recovered to be normal after a period of time, and the diesel engine immediately emergently stops.
4. The diesel engine crankcase pressure monitoring method according to claim 1, characterized in that:
if the crankcase pressure is greater than P c And is less than P s The emergency stop is carried out for a long pending action time T c Is a constant value, T c Far shorter than the alarm time of the pressure of the long undetermined crankcase of the diesel engine, if the fault time of the diesel engine is longer than the long undetermined action time T of the emergency stop c And the diesel engine is emergently stopped.
5. The diesel engine crankcase pressure monitoring method according to claim 1, characterized in that:
if the crankcase pressure is greater thanP s While, the emergency stop is short for pending action time T s Is a constant value, T s Less than the long undetermined action time T of the emergency stop of the diesel engine c If the failure time of the diesel engine is longer than the short pending action time T of the emergency stop s And the diesel engine is emergently stopped.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210607995.2A CN115163305A (en) | 2022-05-31 | 2022-05-31 | Diesel engine crankcase pressure monitoring method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210607995.2A CN115163305A (en) | 2022-05-31 | 2022-05-31 | Diesel engine crankcase pressure monitoring method |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN115163305A true CN115163305A (en) | 2022-10-11 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202210607995.2A Pending CN115163305A (en) | 2022-05-31 | 2022-05-31 | Diesel engine crankcase pressure monitoring method |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN115163305A (en) |
Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2010031839A (en) * | 2008-07-02 | 2010-02-12 | Hanenari Minoru | Non-disassembling engine regenerating device and method |
| CN101970814A (en) * | 2008-03-18 | 2011-02-09 | 沃尔沃拉斯特瓦格纳公司 | Method for functional diagnosis of a separator |
| CN203962158U (en) * | 2014-05-30 | 2014-11-26 | 东风商用车有限公司 | Engine crankcase pressure alarm system |
| US20160319762A1 (en) * | 2013-12-19 | 2016-11-03 | Mtu Friedrichshafen Gmbh | Method and control device for monitoring pressure in a crankcase |
| CN109914522A (en) * | 2019-03-27 | 2019-06-21 | 徐州徐工矿业机械有限公司 | A kind of digger engine high temperature sectional guard method and device |
| CN110594020A (en) * | 2019-09-30 | 2019-12-20 | 潍柴动力股份有限公司 | Reason diagnostic system of crankcase high pressure |
| FR3089559A1 (en) * | 2018-12-05 | 2020-06-12 | Psa Automobiles Sa | METHOD FOR DIAGNOSING THE OPERATION OF A CRANKCASE GAS CIRCUIT FOR A HYBRID VEHICLE |
| JP2021063467A (en) * | 2019-10-15 | 2021-04-22 | 株式会社豊田自動織機 | Control device for internal combustion engine |
| CN213684325U (en) * | 2020-10-28 | 2021-07-13 | 江西五十铃汽车有限公司 | Device for monitoring diesel engine crankshaft ventilation system |
-
2022
- 2022-05-31 CN CN202210607995.2A patent/CN115163305A/en active Pending
Patent Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101970814A (en) * | 2008-03-18 | 2011-02-09 | 沃尔沃拉斯特瓦格纳公司 | Method for functional diagnosis of a separator |
| JP2010031839A (en) * | 2008-07-02 | 2010-02-12 | Hanenari Minoru | Non-disassembling engine regenerating device and method |
| US20160319762A1 (en) * | 2013-12-19 | 2016-11-03 | Mtu Friedrichshafen Gmbh | Method and control device for monitoring pressure in a crankcase |
| CN203962158U (en) * | 2014-05-30 | 2014-11-26 | 东风商用车有限公司 | Engine crankcase pressure alarm system |
| FR3089559A1 (en) * | 2018-12-05 | 2020-06-12 | Psa Automobiles Sa | METHOD FOR DIAGNOSING THE OPERATION OF A CRANKCASE GAS CIRCUIT FOR A HYBRID VEHICLE |
| CN109914522A (en) * | 2019-03-27 | 2019-06-21 | 徐州徐工矿业机械有限公司 | A kind of digger engine high temperature sectional guard method and device |
| CN110594020A (en) * | 2019-09-30 | 2019-12-20 | 潍柴动力股份有限公司 | Reason diagnostic system of crankcase high pressure |
| JP2021063467A (en) * | 2019-10-15 | 2021-04-22 | 株式会社豊田自動織機 | Control device for internal combustion engine |
| CN213684325U (en) * | 2020-10-28 | 2021-07-13 | 江西五十铃汽车有限公司 | Device for monitoring diesel engine crankshaft ventilation system |
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