CN115182801B - Fault processing method and system for lubricating system of engine - Google Patents
Fault processing method and system for lubricating system of engine Download PDFInfo
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- CN115182801B CN115182801B CN202210884488.3A CN202210884488A CN115182801B CN 115182801 B CN115182801 B CN 115182801B CN 202210884488 A CN202210884488 A CN 202210884488A CN 115182801 B CN115182801 B CN 115182801B
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- 230000001050 lubricating effect Effects 0.000 title claims abstract description 45
- 238000003672 processing method Methods 0.000 title abstract description 9
- 238000005461 lubrication Methods 0.000 claims abstract description 92
- 238000000034 method Methods 0.000 claims abstract description 40
- 238000001816 cooling Methods 0.000 claims abstract description 17
- 230000008859 change Effects 0.000 claims description 7
- 230000008569 process Effects 0.000 abstract description 7
- 239000003921 oil Substances 0.000 description 262
- 239000010705 motor oil Substances 0.000 description 45
- 230000008439 repair process Effects 0.000 description 10
- 230000007423 decrease Effects 0.000 description 9
- 238000007789 sealing Methods 0.000 description 8
- 239000000243 solution Substances 0.000 description 5
- 238000012360 testing method Methods 0.000 description 5
- 230000009467 reduction Effects 0.000 description 4
- 238000006073 displacement reaction Methods 0.000 description 3
- 238000001914 filtration Methods 0.000 description 3
- 238000007689 inspection Methods 0.000 description 3
- 230000000630 rising effect Effects 0.000 description 3
- 239000010729 system oil Substances 0.000 description 3
- 230000002159 abnormal effect Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000012423 maintenance Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 230000001960 triggered effect Effects 0.000 description 2
- 206010039203 Road traffic accident Diseases 0.000 description 1
- 230000000903 blocking effect Effects 0.000 description 1
- 230000008878 coupling Effects 0.000 description 1
- 238000010168 coupling process Methods 0.000 description 1
- 238000005859 coupling reaction Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 238000005086 pumping Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01M—LUBRICATING OF MACHINES OR ENGINES IN GENERAL; LUBRICATING INTERNAL COMBUSTION ENGINES; CRANKCASE VENTILATING
- F01M1/00—Pressure lubrication
- F01M1/18—Indicating or safety devices
- F01M1/20—Indicating or safety devices concerning lubricant pressure
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01M—LUBRICATING OF MACHINES OR ENGINES IN GENERAL; LUBRICATING INTERNAL COMBUSTION ENGINES; CRANKCASE VENTILATING
- F01M1/00—Pressure lubrication
- F01M1/16—Controlling lubricant pressure or quantity
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01M—LUBRICATING OF MACHINES OR ENGINES IN GENERAL; LUBRICATING INTERNAL COMBUSTION ENGINES; CRANKCASE VENTILATING
- F01M1/00—Pressure lubrication
- F01M1/18—Indicating or safety devices
- F01M1/20—Indicating or safety devices concerning lubricant pressure
- F01M1/22—Indicating or safety devices concerning lubricant pressure rendering machines or engines inoperative or idling on pressure failure
- F01M1/28—Indicating or safety devices concerning lubricant pressure rendering machines or engines inoperative or idling on pressure failure acting on engine combustion-air supply
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01P—COOLING OF MACHINES OR ENGINES IN GENERAL; COOLING OF INTERNAL-COMBUSTION ENGINES
- F01P3/00—Liquid cooling
- F01P3/06—Arrangements for cooling pistons
- F01P3/08—Cooling of piston exterior only, e.g. by jets
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D13/00—Controlling the engine output power by varying inlet or exhaust valve operating characteristics, e.g. timing
- F02D13/02—Controlling the engine output power by varying inlet or exhaust valve operating characteristics, e.g. timing during engine operation
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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
- Y02T10/12—Improving ICE efficiencies
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Lubrication Of Internal Combustion Engines (AREA)
- Lubrication Details And Ventilation Of Internal Combustion Engines (AREA)
Abstract
The application discloses a fault processing method of a lubricating system of an engine, which is characterized in that in the running process of the engine, a first type oil pressure alarm is sent out under the condition that the main oil duct pressure of the engine is detected to be greater than the highest threshold value of the lubricating system, the variable valve timing opening and closing are controlled, the main oil duct oil pressure is obtained, if the fluctuation of the main oil duct pressure is in a preset range, the engine is controlled to run in a fault running state, and a piston cooling nozzle is started so as to reduce the main oil duct pressure. The application also discloses a fault handling system of the lubrication system of the engine, and the fault handling system is used for executing a fault handling method of the lubrication system of the engine. In the fault processing method, the variable valve timing is controlled to be opened and closed, and the fluctuation condition of the main oil duct pressure is judged, so that the fault is diagnosed. And when the fluctuation of the pressure of the main oil duct is in a preset range, starting the piston cooling nozzle, and operating the engine in a fault operation state, so that the driving experience of a user is improved.
Description
Technical Field
The application belongs to the technical field of engines, and particularly relates to a fault processing method and system for a lubrication system of an engine.
Background
The performance of engine lubrication systems is critical and the engine needs to circulate pressurized fluid or oil through specially configured oil galleries to provide cooling and lubrication to components such as bearings and piston rings. Lubrication is typically used to prevent physical contact between adjacent surfaces that undergo movement with each other. Oil pressure is also used to control various components, such as camshaft phasers. If the oil pressure of the lubricating system is too high, oil leakage can be caused at the filtering position, and if the oil pressure is too low, oil consumption components such as a main shaft bushing, a connecting rod bushing and the like can be damaged, and finally, the engine is damaged.
The traditional engine generally adopts a fixed displacement oil pump, and when the oil pressure of a main oil duct is larger than the opening pressure of a relief valve of the oil pump, the relief valve is opened, so that the oil pressure of a lubricating system is prevented from continuously rising. However, when the lubrication system has high-pressure faults, the vehicle stops running, the oil pressure of the main oil duct alarms, and the faults cannot be diagnosed and decided, so that the driving experience of a user is affected.
Disclosure of Invention
Therefore, the main purpose of the application is to provide a control method for engine cooling, so as to solve the problems that when a lubrication system has high-pressure faults, a vehicle stops running, the faults cannot be diagnosed and decided, and the driving experience of a user is affected.
In order to solve the problems, the technical scheme of the application is realized as follows:
the application provides a fault handling method for a lubrication system of an engine, comprising the following steps:
acquiring main oil duct pressure of an engine;
if the main oil duct pressure is greater than the highest threshold value of the lubrication system, a first type oil pressure alarm is sent out, and the opening and closing of the variable valve timing are controlled;
judging fluctuation change of the main oil duct pressure between the opening and closing of the variable valve timing;
if the fluctuation of the main oil duct pressure is in a preset range, controlling the engine to run in a fault running state;
and when the engine is in a fault operation state, opening a piston cooling nozzle to reduce the main oil duct pressure.
Further, the fault handling method further includes:
and if the fluctuation of the main oil duct pressure is not in the preset range, indicating that the engine stops running.
Further, when the engine is in a fault operation state, the rotating speed of the engine is less than or equal to 1000rpm, and the vehicle speed is less than or equal to 30km/h.
Further, the preset range is 20 to 50kPa.
Further, the fault handling method further includes:
if the main oil duct pressure is between the highest threshold value of the lubricating system and the pressure relief threshold value of the oil pump, the engine continues to run in an original state and the variable valve timing is controlled to be opened and closed, wherein the pressure relief threshold value is an oil pressure threshold value for opening the pressure relief valve of the oil pump;
judging fluctuation change of the main oil duct pressure between the opening and closing of the variable valve timing;
and if the fluctuation of the main oil duct pressure is in the preset range, sending out a fault indication of the oil pump relief valve.
Further, the fault handling method further includes:
and if the main oil duct pressure is between the pressure relief threshold and the lowest threshold of the lubricating system, the engine continues to run in an original state.
Further, the fault handling method further includes:
and if the main oil duct pressure is smaller than or equal to the lowest threshold value of the lubricating system, a second type oil pressure alarm is sent out, the engine is instructed to stop running, and the engine is prohibited from starting.
Further, the lowest threshold value of the lubricating system, the pressure relief threshold value of the oil pump and the highest threshold value of the lubricating system are sequentially increased.
The application also provides a fault handling system for a lubrication system of an engine, the fault handling system being for performing the above described fault handling method, the fault handling system comprising: the hydraulic control system comprises an oil pressure acquisition module, a switch module and a control module, wherein,
the oil pressure acquisition module is used for acquiring the main oil duct pressure of the lubricating system at different moments;
the switch module is used for controlling the opening and closing of the variable valve timing and the opening of the piston cooling nozzle
And the control module is used for judging according to the main oil duct pressure, the highest threshold value and the lowest threshold value of the lubricating system and the pressure relief threshold value of the oil pump so as to control the switch module.
Further, the fault processing system further comprises an alarm module, wherein the alarm module is used for sending out a first type oil pressure alarm or a second type oil pressure alarm.
The application provides a fault processing method and a system of a lubrication system of an engine, wherein the fault processing method comprises the following steps: acquiring main oil duct pressure of an engine; if the main oil duct pressure is greater than the highest threshold value of the lubrication system, a first type oil pressure alarm is sent out, and the opening and closing of the variable valve timing are controlled; judging fluctuation change of the main oil duct pressure between the opening and closing of the variable valve timing; if the fluctuation of the main oil duct pressure is in a preset range, controlling the engine to run in a fault running state; and when the engine is in a fault operation state, opening a piston cooling nozzle to reduce the main oil duct pressure. In the fault processing method, the variable valve timing is controlled to be opened and closed, and the fluctuation condition of the main oil duct pressure is judged, so that the fault is diagnosed. And when the fluctuation of the pressure of the main oil duct is in a preset range, starting the piston cooling nozzle, and operating the engine in a fault operation state, so that the driving experience of a user is improved.
Drawings
FIG. 1 is a schematic flow chart of a fault handling method for a lubrication system of an engine according to an embodiment of the present application;
FIG. 2 is a flow chart of another method for fault handling of a lubrication system of an engine according to an embodiment of the present application;
FIG. 3 is a flow chart of a method for fault handling of a lubrication system of a further engine according to an embodiment of the present application;
FIG. 4 is a system block diagram of a fault handling system for a lubrication system of an engine according to an embodiment of the present application; and
fig. 5 is a schematic diagram of a lubrication system of an engine according to an embodiment of the present application.
Detailed Description
The present application will be described in further detail with reference to the drawings and examples, in order to make the objects, technical solutions and advantages of the present application more apparent. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the application.
The individual features described in the specific embodiments can be combined in any suitable manner, without contradiction, for example by combination of different specific features, to form different embodiments and solutions. Various combinations of the specific features of the application are not described in detail in order to avoid unnecessary repetition.
In the following description, references to the term "first/second/are merely to distinguish between different objects and do not indicate that the objects have the same or a relationship therebetween. It should be understood that references to orientations of "above", "below", "outside" and "inside" are all orientations in normal use, and "left" and "right" directions refer to left and right directions illustrated in the specific corresponding schematic drawings, and may or may not be left and right directions in normal use.
It should be noted that the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising one … …" does not exclude the presence of other like elements in a process, method, article, or apparatus that comprises the element. The term "coupled," unless specifically indicated otherwise, includes both direct and indirect coupling.
For the traditional fixed displacement oil pump, when the rotation speed of the engine is increased, the oil pumping capacity of the oil pump is excessive, so that the oil pressure of the lubrication system is increased, and the oil pressure of the lubrication system is larger than the requirement of the engine. The traditional scheme can adopt the oil pump relief valve, and after main oil gallery engine oil pressure exceeded relief valve opening pressure, the relief valve was opened, lets out some engine oil, avoids lubricating system oil pressure to continue rising. Particularly, when the ambient temperature is lower, the viscosity of the engine oil is high, the flow rate of the engine oil of the lubricating system is more excessive, if an engine oil pump relief valve is not designed or an engine lubricating system relief valve fails, the oil pressure of the engine lubricating system is very high and exceeds the pressure-resistant capacity of the lubricating system, and sealing parts of the lubricating system such as an engine oil filter and the like leak oil. According to the technical scheme, whether the oil pressure of the main oil duct of the customer is low or high is reminded by installing an engine oil pressure switch or an engine oil pressure sensor on the main oil duct of the engine, and the fault of a lubrication system of the customer is reminded by lighting a lamp, so that the engine can only be stopped, and otherwise, the engine can leak oil or be damaged.
In view of this, the embodiments of the present application provide a fault handling method and system for a lubrication system of an engine, which can compare the main oil gallery oil pressure of the lubrication system of the engine with the highest threshold value of the lubrication system, and reduce the main oil gallery oil pressure by adjusting and controlling the VVT (Variable Valve Timing ) and PCJ (Piston Cooling Jets, piston cooling nozzle), so as to make the automobile run in the fault mode and drive to a nearby repair shop for inspection and maintenance.
The fault handling methods and fault handling systems provided in the following embodiments may be any vehicle type engine, which may be used, for example, in passenger cars, and may be used, for example, in trucks.
As shown in fig. 1, an embodiment of the present application provides a fault handling method for a lubrication system of an engine, where a flow of the fault handling method includes:
s1, acquiring the main oil duct pressure of the engine.
Specifically, a pressure sensor is installed on the main oil gallery of the engine, and when the engine is running, the pressure sensor is used for detecting the pressure of engine oil on the main oil gallery when the engine is running.
And S2, if the pressure of the main oil gallery is greater than the highest threshold value of the lubrication system, sending out a first type oil pressure alarm and controlling the opening and closing of the variable valve timing.
Specifically, the main oil duct pressure is compared with the highest threshold value of the lubrication system, and if the main oil duct pressure is greater than the highest threshold value of the lubrication system, a first type oil pressure alarm is sent out, and the opening and closing of the VVT are controlled. It should be noted that VVT is used below to represent variable valve timing for the sake of simplicity of description.
The highest threshold value of the lubrication system is the maximum oil pressure allowed by the lubrication system of the engine, the highest threshold value of the lubrication system can set the engine on the experiment machine table and set the pressure relief valve of the lubrication system in a normally closed state, the test is stopped by gradually increasing the pressure of the lubrication system until the oil leakage phenomenon occurs in the sealing parts of the lubrication system such as an oil filter of the engine, and the oil pressure at the moment is determined to be the highest threshold value of the lubrication system.
Specifically, the main oil duct pressure is compared with the highest threshold value of the lubrication system, the ECU judges that the main oil duct pressure is larger than the highest threshold value of the lubrication system, and the ECU sends out a first type of alarm oil pressure to remind passengers that the oil pressure of the lubrication system of the engine is too high and controls the opening and closing of the VVT.
And S3, judging fluctuation change of the main oil duct pressure between the opening and closing of the variable valve timing.
Specifically, the ECU controls the VVT to be opened, observes the fluctuation condition of the pressure of the main oil duct of the engine, and closes the VVT after the pressure fluctuation condition of the main oil duct of the engine is collected.
And S4, if the fluctuation of the main oil duct pressure is in a preset range, controlling the engine to run in a fault running state.
Specifically, when the fluctuation range of the main oil duct pressure is in a preset range, the ECU controls the engine to enter a fault running state, and meanwhile, the PCJ is forcedly opened to reduce the engine main oil duct pressure, so that oil leakage of sealing elements of lubrication systems such as engine filtering and the like does not occur.
In the fault processing method, the variable valve timing is controlled to be opened and closed, and the fluctuation condition of the main oil duct pressure is judged, so that the fault is diagnosed. And when the fluctuation of the pressure of the main oil duct is in a preset range, starting the piston cooling nozzle, and operating the engine in a fault operation state, so that the driving experience of a user is improved.
Through in the in-process of engine operation, under the state that detects the main oil gallery pressure of engine and be greater than lubricating system's highest threshold, ECU shows first class oil pressure warning information on the car display screen, remind customer high pressure trouble, the variable valve timing of ECU control opens and acquires main oil gallery oil pressure simultaneously, if main oil gallery oil pressure decline and decline amplitude are in the default range this moment, it is unblocked to indicate variable valve timing oil circuit, then ECU control piston cooling nozzle opens, be used for reducing main oil gallery oil pressure, the passenger can drive nearby repair shop through the engine under the trouble running state and maintain, when avoiding main oil gallery pressure to be greater than lubricating system's highest threshold, automobile engine stops working, the traffic accident is triggered.
In an embodiment, as shown in fig. 2, S3, determining a fluctuation range of the main oil gallery pressure between the opening and the closing of the VVT, further includes:
and S5, if the fluctuation of the main oil duct pressure is not in a preset range, indicating that the engine stops running.
Specifically, if the fluctuation of the main oil gallery pressure is smaller than the preset range, the VVT is located on the engine end oil path, so that the engine end oil path is determined to be blocked, the engine cannot continue to run at the moment, the ECU informs the client to stop immediately, the engine is prohibited from being restarted, and the client can call the trailer to transport the automobile to a repair shop for repair. If the oil way at the tail end of the engine is blocked, the engine continues to run, and huge damage is caused to the engine.
The engine lubricating system comprises an engine oil circuit system and an oil utilization component, wherein the oil utilization component comprises a main shaft bush, a PCJ, a chain tensioner, a VVT, a camshaft, a high-pressure oil pump and the like, and the VVT is positioned on an oil circuit at the tail end of the engine.
In one embodiment, the engine is in a faulty operating state, the engine speed is 1000rpm or less, and the vehicle speed is 30km/h or less. Specifically, when the pressure of the main oil duct of the engine is greater than the maximum threshold value of the lubricating system, the VVT is controlled to be opened, if the fluctuation of the pressure of the main oil duct is in a preset threshold value, the ECU controls the engine to enter a fault running state, so that the rotating speed of the engine is less than or equal to 1000rpm, the vehicle speed is less than or equal to 30km/h, and meanwhile, after the PCJ is controlled to be forcedly opened, the flow requirement of the engine is suddenly increased by about 30%, the pressure of the main oil duct is suddenly reduced by 200-500 kPa, the oil pressure is reduced to be within the pressure-resistant range of the lubricating system when the engine runs at a low speed, and the sealing elements of the lubricating system such as the engine filter and the like are ensured to be free from oil leakage. And as the engine runs at low speed, the temperature of the engine oil gradually increases, the viscosity of the engine oil decreases, and at this time, the flow resistance of the engine oil of the lubrication system decreases, and the pressure of the engine oil also decreases. In particular, a temperature sensor may be further disposed on the main oil gallery to detect the temperature of the engine oil in the main oil gallery at different moments, when the temperature of the engine oil is less than a preset value, for example, the preset value is 75 °, the rotational speed of the engine is set to be less than or equal to 1000rpm, the vehicle speed is less than or equal to 30km/h, and when the temperature of the engine oil is greater than the preset value, the rotational speed of the engine is increased to 1100rpm, and the vehicle speed is increased to 40km/h, so that the engine reaches a nearby repair shop faster in a faulty operation state.
In one embodiment, the predetermined range is 20 to 50kPa. Specifically, the fluctuation range of the main oil gallery pressure may be measured on a test stand. Under different main oil duct pressures, the VVT is forced to be started, the flow of 2-3L engine oil is suddenly increased, the main oil duct oil pressure is reduced at the moment, a plurality of oil pressure reduction amplitude values are obtained through testing the main oil duct oil pressure for a plurality of times, the minimum value and the maximum value in the plurality of oil pressure reduction amplitude values are selected, and the oil pressure range between the minimum value and the maximum value is determined as the fluctuation range. For example, when the engine is started on a test stand, the main oil pressure value is measured to be 1000KPa, and after the VVT is forcibly started, the main oil pressure value is reduced to 950KPa, and the oil pressure reduction amplitude value is 50KPa. For example, when the engine is started on a test stand, the main oil pressure value is 950KPa, and after the VVT is forcibly started, the main oil pressure value is reduced to 930KPa, and the oil pressure reduction amplitude value is 20KPa. And obtaining the maximum value and the minimum value of a plurality of oil pressure drop amplitude values under different main oil gallery pressures.
In one embodiment, as shown in fig. 3, the fault handling method further includes the following steps:
s6, if the pressure of the main oil duct is between the highest threshold value of the lubricating system and the pressure relief threshold value of the oil pump, the engine continues to run in an original state, and the variable valve timing is controlled to be opened and closed, wherein the pressure relief threshold value is the oil pressure threshold value of the oil pump for opening the pressure relief valve;
s7, judging fluctuation change of the main oil duct pressure between the opening and closing of the variable valve timing;
and S8, if the fluctuation of the main oil duct pressure is in the preset range, sending out a fault indication of the oil pump relief valve.
Specifically, if the obtained main oil duct pressure is between the highest threshold of the lubrication system and the pressure relief threshold of the oil pump, the engine continues to run in an original state and the VVT is controlled to be opened and closed, wherein the pressure relief threshold is the oil pressure threshold of the oil pump for opening the pressure relief valve. For example, if the main oil pressure is read to be greater than the relief threshold of the oil pump and less than the highest threshold of the lubrication system during the running of the vehicle, the oil pressure of the lubrication system will not trigger an alarm at this time, and the engine will not cause damage and oil leakage when running. And the ECU controls the VVT to be started, acquires the fluctuation value of the main oil duct pressure again, and if the fluctuation value of the main oil duct pressure is in a preset range, the end oil way of the lubricating system where the VVT is positioned is not blocked, which is caused by the fact that a pressure release valve of an oil pump cannot be opened, and simultaneously, the ECU informs a client that the oil pressure is abnormal through an instrument panel, so that the engine can continue to run to a nearby repair shop for inspection and repair.
In an embodiment, the fault handling method further comprises: if the main oil duct pressure is between the pressure relief threshold and the lowest threshold of the lubrication system, the engine continues to operate in an original state.
Specifically, in the running process of the automobile, the pressure of the main oil duct is read to be smaller than the pressure relief valve and larger than the lowest threshold value of the lubricating system, the engine oil pressure is in a normal range, the pressure relief valve is in a closed state, and the engine continues to run according to normal working conditions. It should be noted that, when the lowest threshold value of the lubrication system is the idle running of the engine, the minimum oil pressure requirement of the lubrication function of the normal running of the engine is ensured.
In an embodiment, the fault handling method further comprises: and if the pressure of the main oil duct is smaller than or equal to the lowest threshold value of the lubrication system, sending out a second type oil pressure alarm and indicating the engine to stop running, and prohibiting the engine from starting. Specifically, during the running process of the automobile, the pressure of the main oil duct is read to be less than or equal to the lowest threshold value of the lubrication system, at the moment, the oil pressure of the lubrication system cannot maintain the lubrication requirement when the engine runs, the engine is seriously damaged when the engine is continued to run, and the ECU sends out a second type oil pressure alarm through the instrument panel to inform a customer of stopping immediately and forbids the engine from starting again. The second type of oil pressure alarm is engine oil low pressure alarm.
In one embodiment, the lowest threshold of the lubrication system, the pressure relief threshold of the oil pump, and the highest threshold of the lubrication system are sequentially incremented. Specifically, when the lowest threshold value of the lubrication system is the lowest engine oil pressure requirement for guaranteeing the normal operation lubrication function of the engine during idle operation of the engine, when the oil pressure of the lubrication system is lower than the lowest threshold value of the lubrication system, the engine operation can cause mechanical damage of oil parts, and the mechanical damage can seriously cause cylinder pulling and tile holding. The pressure relief valve of the oil pump can be obtained from a production specification list of the oil pump, and when the oil pressure of the lubricating system is larger than the pressure relief valve of the oil pump, the pressure relief valve is opened so as to reduce the oil pressure of the lubricating system. The highest threshold value of the lubrication system is the highest pressure-resistant value of the lubrication system, and when the oil pressure of the lubrication system exceeds the highest threshold value of the lubrication system, oil leakage risks can occur to sealing elements of the lubrication system such as machine filters and sealing rings. The lowest threshold value of the lubricating system is smaller than the pressure relief threshold value of the oil pump, and the pressure relief threshold value of the oil pump is smaller than the highest threshold value of the lubricating system. For example, the lowest threshold of the lubrication system is 50kPa, the pressure relief threshold of the oil pump is 700kPa, and the highest threshold of the lubrication system is 1200kPa.
As shown in fig. 4, the embodiment of the present application further provides a fault handling system 100 for a lubrication system of an engine, where the fault handling system 100 is configured to perform the above-described fault handling method for a lubrication system of an engine, and the fault handling system 100 includes an oil pressure acquisition module 110, a switch module 120, and a control module 130, where the oil pressure acquisition module 110 is configured to acquire a main oil gallery pressure of the lubrication system at different moments. The switch module 120 is used to control variable valve timing opening and closing and opening of the piston cooling nozzle. The control module 130 is configured to determine according to the main oil pressure, the highest threshold and the lowest threshold of the lubrication system, and the pressure relief threshold of the oil pump, so as to control the switch module 120.
Specifically, the oil pressure acquisition module 110 acquires the main oil gallery pressure of the lubrication system at different times by a pressure sensor mounted on the main oil gallery. The control module 130 determines the obtained main oil gallery pressure and the highest and lowest thresholds of the lubrication system and the relief valve of the oil pump. For example, when the control module 130 determines that the main oil gallery pressure is greater than the highest threshold of the lubrication system, the control module 130 controls the switch module 120 to turn on the VVT, the oil pressure obtaining module 110 obtains the main oil gallery pressure again, the switch module 120 turns off the VVT, and if the pressure drop amplitude of the main oil gallery is within the preset range, the switch module 120 will forcedly turn on the PCJ.
In one embodiment, the fault handling system 100 further includes an alarm module for issuing a first type of oil pressure alarm or a second type of oil pressure alarm. Specifically, when the control module judges that the main oil duct pressure is greater than the highest threshold value of the lubrication system, the alarm module sends out a first type oil pressure alarm to prompt that the oil pressure of the lubrication system is too high. When the module judges that the pressure of the main oil duct is smaller than the lowest threshold value of the lubrication system, the alarm module sends out a second type oil pressure alarm to prompt that the oil pressure of the lubrication system is too low and inform a customer of stopping immediately. When the control module judges that the main oil duct pressure is larger than the pressure relief valve value of the oil pump and smaller than the highest valve value of the lubrication system, the control module 130 starts the VVT through the switch module 120, the oil pressure acquisition module 110 acquires the fluctuation value of the main oil duct pressure again, if the fluctuation value of the main oil duct pressure is in a preset range, the alarm module sends out an oil pump pressure relief valve fault indication, and meanwhile, the switch module 120 forcibly starts the PCJ to prompt the client vehicle to continue running, but the client vehicle needs to be driven to go nearby repair shops for inspection and repair as soon as possible.
In order to better understand the fault handling method of the lubrication system for an engine according to the embodiment of the present application, a process of the fault handling method will be described with reference to fig. 5.
The engine lubricating system comprises an engine oil circuit system and oil components such as a main shaft bushing, a connecting rod bushing, a PCJ, a chain tensioner, a VVT, a camshaft, a high-pressure oil pump, a vacuum pump and the like. Based on the lubrication system calculations, the PCJ (piston cooling nozzle) flow is approximately 30% of the total lubrication system flow. For the PCJ controlled by the electromagnetic valve, whether the PCJ oil injection cooling piston is started or not is controlled by the on-off control of the electromagnetic valve, and when the PCJ is suddenly started, the oil pressure of the main oil gallery is suddenly reduced due to the sudden and large increase of the flow demand of the engine lubricating system. And the oil pressure drop amplitude is related to the engine oil temperature, and the lower the oil temperature is, the larger the oil pressure drop is.
When the VVT of the engine is switched on and off, the flow demand of the lubricating system of the engine is increased in a short time due to the fact that engine oil needs to be filled into the volume of the actuating mechanism of the VVT, the oil pressure of a main oil duct of the engine is suddenly reduced by about 20-50 kPa, and after the switching of the opening and the closing of the VVT is completed, the oil pressure of the lubricating system is restored to be stable.
When the main oil duct of the engine lubricating system is provided with an engine oil pressure sensor, and the oil pressure sensor detects a fault that the engine oil pressure is high, the possible reasons are that a relief valve of an engine oil pump fails and cannot be opened, or an oil way at the rear end of the main oil duct is blocked. When the oil pressure sensor detects a failure of low oil pressure, the oil pump relief valve may be blocked in an open state and cannot be closed, or the oil passage may leak. Different strategies are needed to be adopted for different fault modes, and the vehicle is ensured not to break down on the premise of ensuring the safe operation of the engine.
For example, the engine main oil passage pressure sensor reads the oil pressure as P, the oil pump relief valve opening oil pressure is set as P1, the lubrication system oil pressure lower limit alarm value is set as P2, and the lubrication system oil pressure upper limit alarm value is set as P3. In particular, P1 is set to 700kPa, P2 is set to 50kPa, P3 is set to 1200kPa, where P2 is the lowest pressure requirement to ensure the normal lubrication function of the engine during engine idle operation, P3 is the highest pressure resistance of the lubrication system, and oil leakage occurs in the lubrication system seals such as filtering when exceeding P3. For a conventional fixed displacement oil pump there are 4 oil pressure conditions:
1. when P is more than or equal to P3, high-voltage fault alarm is triggered, and the high-voltage fault alarm can occur only under the following two conditions: 1) When the temperature of the engine oil is low and the pressure release valve of the engine oil pump cannot be opened, at the moment, the engine oil is low in temperature, high in viscosity, high in flowing resistance of the engine oil, and high in pressure of the main oil duct of the engine, excessive engine oil is needed to be discharged through the pressure release valve of the engine oil pump at the moment, if the pressure release valve of the engine oil pump cannot be opened, the pressure of the engine oil continuously rises, high-pressure alarm is caused, and when the engine continuously runs, the temperature of the engine oil gradually rises, the viscosity of the engine oil is reduced, and the pressure of the engine oil gradually decreases; 2) When the engine end oil way is blocked and the oil pump pressure release valve fails to be opened, the oil flow resistance is large due to the blocking of the end oil way, the main oil way is high in oil pressure when the engine runs, excessive oil is required to be discharged through the oil pump pressure release valve, and if the oil pump pressure release valve cannot be opened, the continuous rising of the oil pressure can occur, so that high-pressure alarm is caused. If the engine runs into a high-pressure alarm, the VVT is controlled to be opened and closed, the oil pressure fluctuation condition of the main oil passage of the engine is observed, if the oil pressure of the main oil passage of the engine is reduced by about 20-50 kPa, the VVT oil passage is not blocked, and because the VVT belongs to the oil passage at the tail end of the engine, the oil passage at the tail end of the engine is not blocked, at the moment, the oil pump relief valve is judged to be unable to be opened, in this case, the engine is controlled to run in a first working condition (a fault running mode), the client is reminded of high-pressure faults, and the engine can be driven to a repair shop for checking and maintaining through the fault mode; if the oil pressure of the main oil duct of the engine does not fluctuate when the VVT is opened and closed, the oil duct at the tail end of the engine is judged to be blocked, at the moment, the engine cannot continue to run, a client is informed of stopping immediately, the engine is prohibited from being started again, and the safety of the engine is ensured.
Working condition one: the engine speed is controlled to be less than or equal to 1000rpm, the vehicle speed is controlled to be less than or equal to 30km/h, the PCJ is forced to be opened in the whole course, as P is more than or equal to P3 and the oil way at the tail end of the engine is not blocked, the engine continues to run at a low speed, and the engine is not damaged, but the high oil pressure can cause oil leakage of lubricating system sealing parts such as engine filter and the like, at the moment, the engine is controlled to run under the first working condition, the PCJ is forced to be opened, the flow requirement of the engine is suddenly increased by about 30%, the oil pressure of a main oil duct is reduced by 200-500 kPa, the oil pressure is reduced to be within the pressure-resistant range of the lubricating system during the low-speed running of the engine, and the lubricating system sealing parts such as the engine filter and the like are ensured not to leak oil. And as the temperature of the engine oil increases, the viscosity of the oil decreases, and at this time, the flow resistance of the oil in the lubrication system decreases, and the pressure of the oil also continues to decrease.
2. When P1 is less than or equal to P3, the engine oil pressure can not alarm at the moment, and the engine can not be damaged or leaked during running. At this time, the engine can continue to run according to the normal working condition because the pressure relief valve of the oil pump cannot be opened generally, but the abnormal engine oil pressure is informed to a client through an instrument, and the engine oil pressure is required to be checked and maintained by a nearby maintenance shop.
3. When P2 is less than P1, the engine oil pressure is in a normal range, and the engine operates according to a normal working condition.
4. When P is less than or equal to P2, the engine oil pressure is low, the engine oil pressure is alarmed, the lubrication system pressure can not maintain the lubrication requirement when the engine runs, the engine is seriously damaged when the engine is continued to run, a customer is notified to stop immediately, the engine is prohibited from being restarted, and the safety of the engine is ensured.
The above embodiments are only for illustrating the technical solution of the present application, and are not limiting; although the present application has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that modifications may be made to the technical solutions described in the foregoing embodiments, or equivalents may be substituted for some of the technical features thereof; such modifications and substitutions do not depart from the spirit and scope of the corresponding technical solutions.
Claims (9)
1. A fault handling method for a lubrication system of an engine, comprising:
acquiring main oil duct pressure of an engine;
if the main oil duct pressure is greater than the highest threshold value of the lubrication system, a first type oil pressure alarm is sent out, and the opening and closing of the variable valve timing are controlled;
judging fluctuation change of the main oil duct pressure between the opening and closing of the variable valve timing;
if the fluctuation of the main oil duct pressure is in a preset range, the engine is controlled to run in a fault running state, and if the fluctuation of the main oil duct pressure is not in the preset range, the engine is instructed to stop running;
and when the engine is in a fault operation state, opening a piston cooling nozzle to reduce the main oil duct pressure.
2. The method according to claim 1, wherein the engine is rotated at 1000rpm or less and the vehicle speed is 30km/h or less in the faulty operation state.
3. The fault handling method of claim 1, wherein the predetermined range is 20 to 50kPa.
4. The fault handling method of claim 1, further comprising:
if the main oil duct pressure is between the highest threshold value of the lubricating system and the pressure relief threshold value of the oil pump, the engine continues to run in an original state and the variable valve timing is controlled to be opened and closed, wherein the pressure relief threshold value is an oil pressure threshold value for opening the pressure relief valve of the oil pump;
judging fluctuation change of the main oil duct pressure between the opening and closing of the variable valve timing;
and if the fluctuation of the main oil duct pressure is in the preset range, sending out a fault indication of the oil pump relief valve.
5. The fault handling method of claim 4, further comprising:
and if the main oil duct pressure is between the pressure relief threshold and the lowest threshold of the lubricating system, the engine continues to run in an original state.
6. The fault handling method of claim 5, further comprising:
and if the main oil duct pressure is smaller than or equal to the lowest threshold value of the lubricating system, a second type oil pressure alarm is sent out, the engine is instructed to stop running, and the engine is prohibited from starting.
7. The fault handling method of claim 6, wherein a lowest threshold of the lubrication system, a pressure relief threshold of the oil pump, and a highest threshold of the lubrication system are sequentially incremented.
8. A fault handling system for a lubrication system of an engine, the fault handling system for performing the fault handling method for a lubrication system of an engine of any one of claims 1 to 7, the fault handling system comprising: the hydraulic control system comprises an oil pressure acquisition module, a switch module and a control module, wherein,
the oil pressure acquisition module is used for acquiring the main oil duct pressure of the lubricating system at different moments;
the switch module is used for controlling the opening and closing of the variable valve timing and the opening of the piston cooling nozzle
And the control module is used for judging according to the main oil duct pressure, the highest threshold value and the lowest threshold value of the lubricating system and the pressure relief threshold value of the oil pump so as to control the switch module.
9. The fault handling system of claim 8, further comprising an alarm module for issuing a first type of oil pressure alarm or a second type of oil pressure alarm.
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Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2009041445A (en) * | 2007-08-08 | 2009-02-26 | Toyota Motor Corp | Hydraulic control device for internal combustion engine |
| CN102787881A (en) * | 2011-05-19 | 2012-11-21 | 马自达株式会社 | Oil-pressure determination apparatus of engine |
| CN102788690A (en) * | 2011-05-19 | 2012-11-21 | 通用汽车环球科技运作有限责任公司 | Method to diagnose a fault of an oil piston cooling jets valve |
| CN211874570U (en) * | 2020-04-14 | 2020-11-06 | 北京福田康明斯发动机有限公司 | Lubricating oil channel structure of engine |
| CN113187579A (en) * | 2021-05-20 | 2021-07-30 | 东风汽车集团股份有限公司 | Engine lubrication system and control method thereof |
| CN113756907A (en) * | 2021-08-05 | 2021-12-07 | 东风汽车集团股份有限公司 | Engine oil pressure control method and device and vehicle |
| CN113982738A (en) * | 2021-11-23 | 2022-01-28 | 中国第一汽车股份有限公司 | Control method, device and system for piston cooling nozzle and electronic equipment |
-
2022
- 2022-07-25 CN CN202210884488.3A patent/CN115182801B/en active Active
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2009041445A (en) * | 2007-08-08 | 2009-02-26 | Toyota Motor Corp | Hydraulic control device for internal combustion engine |
| CN102787881A (en) * | 2011-05-19 | 2012-11-21 | 马自达株式会社 | Oil-pressure determination apparatus of engine |
| CN102788690A (en) * | 2011-05-19 | 2012-11-21 | 通用汽车环球科技运作有限责任公司 | Method to diagnose a fault of an oil piston cooling jets valve |
| CN211874570U (en) * | 2020-04-14 | 2020-11-06 | 北京福田康明斯发动机有限公司 | Lubricating oil channel structure of engine |
| CN113187579A (en) * | 2021-05-20 | 2021-07-30 | 东风汽车集团股份有限公司 | Engine lubrication system and control method thereof |
| CN113756907A (en) * | 2021-08-05 | 2021-12-07 | 东风汽车集团股份有限公司 | Engine oil pressure control method and device and vehicle |
| CN113982738A (en) * | 2021-11-23 | 2022-01-28 | 中国第一汽车股份有限公司 | Control method, device and system for piston cooling nozzle and electronic equipment |
Non-Patent Citations (1)
| Title |
|---|
| VVA发动机润滑系统CAE优化;林灵;詹樟松;闵龙;谯鑫;韦颂;刘斌;张晓宇;朱玉明;王茂辉;;重庆理工大学学报(自然科学版)(第12期);全文 * |
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