CN115182801A - Fault handling method and system for lubricating system of engine - Google Patents
Fault handling method and system for lubricating system of engine Download PDFInfo
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- CN115182801A CN115182801A CN202210884488.3A CN202210884488A CN115182801A CN 115182801 A CN115182801 A CN 115182801A CN 202210884488 A CN202210884488 A CN 202210884488A CN 115182801 A CN115182801 A CN 115182801A
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- 230000001050 lubricating effect Effects 0.000 title claims abstract description 103
- 238000000034 method Methods 0.000 title claims abstract description 52
- 238000001816 cooling Methods 0.000 claims abstract description 16
- 238000005461 lubrication Methods 0.000 claims description 34
- 230000008859 change Effects 0.000 claims description 7
- 230000008569 process Effects 0.000 abstract description 10
- 238000003672 processing method Methods 0.000 abstract description 5
- 239000003921 oil Substances 0.000 description 262
- 239000010705 motor oil Substances 0.000 description 34
- 238000007789 sealing Methods 0.000 description 9
- 238000012423 maintenance Methods 0.000 description 7
- 230000008439 repair process Effects 0.000 description 4
- 239000000243 solution Substances 0.000 description 4
- 238000012360 testing method Methods 0.000 description 4
- 238000006073 displacement reaction Methods 0.000 description 3
- 230000009467 reduction Effects 0.000 description 3
- 230000002159 abnormal effect Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000000630 rising effect Effects 0.000 description 2
- 239000010729 system oil Substances 0.000 description 2
- 206010039203 Road traffic accident Diseases 0.000 description 1
- 230000007613 environmental effect Effects 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
- 238000007689 inspection Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000005086 pumping Methods 0.000 description 1
- GOLXNESZZPUPJE-UHFFFAOYSA-N spiromesifen Chemical compound CC1=CC(C)=CC(C)=C1C(C(O1)=O)=C(OC(=O)CC(C)(C)C)C11CCCC1 GOLXNESZZPUPJE-UHFFFAOYSA-N 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 230000001960 triggered effect Effects 0.000 description 1
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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
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- 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, wherein in the running process of the engine, a first type of oil pressure alarm is sent out under the condition that the pressure of a main oil gallery of the engine is detected to be larger than the highest threshold value of the lubricating system, a variable valve is controlled to be opened and closed in a timing mode, the oil pressure of the main oil gallery is obtained, if the fluctuation of the pressure of the main oil gallery is within a preset range, the engine is controlled to run under the fault running state, and a piston cooling nozzle is opened, so that the pressure of the main oil gallery is reduced. The application also discloses a fault handling system of the lubricating system of the engine, and the fault handling system is used for executing a fault handling method of the lubricating 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 gallery pressure is judged, so that the fault is diagnosed. When the pressure fluctuation of the main oil duct is within a preset range, the piston cooling nozzle is opened, and the engine runs in a fault running state, so that the driving experience of a user is improved.
Description
Technical Field
The invention belongs to the technical field of engines, and particularly relates to a fault processing method and system for a lubricating system of an engine.
Background
The performance of an engine lubrication system is critical and the engine needs to circulate pressurized fluid or oil through specially configured oil passages to provide cooling and lubrication to components such as bearings and piston rings. Lubrication is commonly used to prevent physical contact between adjacent surfaces that experience 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 at a machine filter position can be caused, and if the oil pressure is too low, oil using parts such as a main shaft bushing and a connecting rod bushing can be damaged, and finally the engine can be damaged.
The traditional engine generally adopts a fixed-displacement oil pump, and when the oil pressure of a main oil gallery is greater than the opening pressure of an oil pump pressure release valve, the pressure release valve is opened to avoid the oil pressure of a lubricating system from continuously rising. However, when the lubricating system has a high-pressure fault, the vehicle stops running, the main oil gallery oil pressure gives an alarm, the fault cannot be diagnosed and decided, and the driving experience of a user is influenced.
Disclosure of Invention
In view of the above, the present invention is to provide a method for controlling engine cooling, so as to solve the problem that when a high-voltage fault occurs in a lubrication system, a vehicle stops running, the fault is not diagnosed and decided, and the driving experience of a user is not affected.
In order to solve the above problems, the technical solution of the present invention is implemented as follows:
the application provides a fault handling method for a lubrication system of an engine, comprising:
acquiring the pressure of a main oil gallery of an engine;
if the pressure of the main oil gallery is greater than the highest threshold value of the lubricating system, a first type of oil pressure alarm is sent out, and the variable valve is controlled to be opened and closed in a timing mode;
judging fluctuation change of the main oil gallery pressure between opening and closing of the variable valve timing;
if the pressure fluctuation of the main oil gallery is within a preset range, controlling the engine to operate in a fault operation state;
wherein the piston cooling nozzle is opened to reduce the main gallery pressure when the engine is in a faulty operating state.
Further, the fault handling method further includes:
and if the pressure fluctuation of the main oil gallery is not in the preset range, indicating that the engine stops running.
Further, when the engine is in a failure 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 20-50 kPa.
Further, the fault handling method further includes:
if the pressure of the main oil gallery is between the highest threshold of the lubricating system and the pressure relief threshold of the oil pump, the engine continues to operate in the original state, and the variable valve is controlled to be opened and closed in timing, wherein the pressure relief threshold is the oil pressure threshold of the oil pump pressure relief valve;
judging fluctuation change of the main oil gallery pressure between opening and closing of the variable valve timing;
and if the pressure fluctuation of the main oil gallery is within the preset range, sending a fault indication of the oil pump pressure relief valve.
Further, the fault handling method further includes:
and if the pressure of the main oil gallery is between the pressure relief threshold value and the lowest threshold value of the lubricating system, the engine continues to operate in the original state.
Further, the fault handling method further includes:
and if the pressure of the main oil gallery is less than or equal to the lowest threshold value of the lubricating system, a second type of oil pressure alarm is sent out, the engine is indicated to stop running, and the engine is prohibited from starting.
Further, the lowest threshold of the lubricating system, the pressure relief threshold of the oil pump and the highest threshold of the lubricating system are sequentially increased.
The present application also provides a fault handling system for a lubrication system of an engine, the fault handling system being configured to perform the above-mentioned fault handling method, the fault handling system comprising: an oil pressure acquisition module, a switch module and a control module, wherein,
the oil pressure acquisition module is used for acquiring the pressure of a main oil gallery of the lubricating system at different moments;
the switch module is used for controlling the timing opening and closing of the variable valve and the opening of the piston cooling nozzle
And the control module is used for judging according to the pressure of the main oil gallery, the highest threshold and the lowest threshold of the lubricating system and the pressure relief threshold of the oil pump so as to control the switch module.
Further, the fault handling system further comprises an alarm module, and 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 handling method and a system of a lubricating system of an engine, wherein the fault handling method comprises the following steps: acquiring the pressure of a main oil gallery of an engine; if the pressure of the main oil gallery is greater than the highest threshold value of the lubricating system, a first type of oil pressure alarm is sent out, and the variable valve is controlled to be opened and closed in a timing mode; judging the fluctuation change of the main oil duct pressure between the opening and the closing of the variable valve timing; if the pressure fluctuation of the main oil gallery is within a preset range, controlling the engine to operate in a fault operation state; wherein the piston cooling nozzle is opened to reduce the main gallery pressure when the engine is in a faulty operating state. In the fault processing method, the variable valve timing is controlled to be opened and closed, and the fluctuation condition of the main oil gallery pressure is judged, so that the fault is diagnosed. When the pressure fluctuation of the main oil duct is within a preset range, the piston cooling nozzle is opened, and the engine runs in a fault running state, so that the driving experience of a user is improved.
Drawings
FIG. 1 is a schematic flow chart illustrating a method for handling a fault in a lubrication system of an engine according to an embodiment of the present disclosure;
FIG. 2 is a schematic flow chart illustrating another method for handling a fault in a lubrication system of an engine according to an embodiment of the present disclosure;
FIG. 3 is a schematic flow chart illustrating a method for handling a fault in a lubrication system of an engine according to an embodiment of the present disclosure;
FIG. 4 is a system block diagram illustrating a fault handling system of a lubrication system of an engine according to an embodiment of the present disclosure; and
FIG. 5 is a schematic diagram of a lubrication system of an engine according to an embodiment of the present disclosure.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
The individual features described in the embodiments can be combined in any suitable manner without departing from the scope, for example different embodiments and aspects can be formed by combining different features. In order to avoid unnecessary repetition, various possible combinations of the specific features of the invention will not be described further.
In the following description, the term "first/second/so" is used merely to distinguish different objects and does not mean that there is a common or relationship between the objects. It should be understood that the description of the "upper", "lower", "outer" and "inner" directions as related to the orientation in the normal use state, and the "left" and "right" directions indicate the left and right directions indicated in the corresponding schematic drawings, and may or may not be the left and right directions in the normal use state.
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 phrases "comprising a component of' 8230; \8230;" does not exclude the presence of another like element in a process, method, article, or apparatus that comprises the element. The term "coupled", where not otherwise specified, includes both direct and indirect connections.
For a traditional fixed displacement oil pump, when the rotating speed of an engine is increased, the oil pumping capacity of the oil pump is excessive, so that the oil pressure of a lubricating system is increased, and at the moment, the oil pressure of the lubricating system is greater than the requirement of the engine. The oil pump pressure relief valve can be adopted in the traditional scheme, and when the oil pressure of the main oil gallery exceeds the opening pressure of the pressure relief valve, the pressure relief valve is opened to release part of the oil, so that the oil pressure of the lubricating system is prevented from continuously rising. Particularly, when the environmental temperature is low, the viscosity of the engine oil is high, the flow of the engine oil of the lubricating system is more excessive, if no engine oil pump pressure relief valve is designed or the engine lubricating system pressure relief valve fails, the oil pressure of the engine lubricating system is very high, the pressure resistance of the lubricating system is exceeded, and oil leakage of sealing parts of the lubricating system such as an oil filter is caused. In the prior art, an oil pressure switch or an oil pressure sensor is arranged on a main oil duct of an engine to remind a client of whether the oil pressure of the main oil duct is low or high, and a light is turned on to remind the client of a fault of a lubricating system, at the moment, the engine can only be stopped, otherwise, the engine is leaked or damaged.
In view of this, embodiments of the present application provide a fault handling method and system for a lubrication system of an engine, which can compare a main oil gallery oil pressure of the lubrication system of the engine with a maximum threshold value of the lubrication system, and reduce the main oil gallery oil pressure by adjusting and controlling VVT (Variable Valve Timing) and PCJ (Piston Cooling Jets) so that an automobile is driven to a nearby repair shop for inspection and maintenance in a fault mode.
The fault handling method and fault handling system provided in the following detailed description may be any vehicle type engine, which may be used in a passenger car, for example, and in a truck, for example.
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, obtaining the pressure of a main oil gallery of the engine.
Specifically, a pressure sensor is mounted on a main oil gallery of the engine, and when the engine is running, the pressure sensor is used for detecting oil pressure on the main oil gallery when the engine is working.
And S2, if the pressure of the main oil gallery is greater than the highest threshold value of the lubricating system, a first type of oil pressure alarm is sent out, and the variable valve is controlled to be opened and closed in a timing mode.
Specifically, the main oil gallery pressure is compared with the highest threshold value of the lubricating system, if the main oil gallery pressure is larger than the highest threshold value of the lubricating system, a first type of oil pressure alarm is sent out, and the VVT is controlled to be opened and closed. It should be noted that VVT is used hereinafter to represent variable valve timing for the sake of simplicity of description, as will be better understood.
It should be noted that the highest threshold of the lubricating system is the maximum oil pressure allowed by the engine lubricating system, the highest threshold of the lubricating system can set the engine on an experimental machine and set a pressure relief valve of the lubricating system in a normally closed state, the test is stopped by gradually increasing the pressure of the lubricating system until oil leakage occurs in sealing parts of the lubricating system, such as an oil filter of the engine, and the oil pressure at this time is determined as the highest threshold of the lubricating system.
Specifically, the main oil gallery pressure is compared with the highest threshold value of the lubricating system, the ECU judges that the main oil gallery pressure is larger than the highest threshold value of the lubricating system, the ECU sends out first-class alarm oil pressure to remind passengers that the oil pressure of the engine lubricating system is too high, and the VVT is controlled to be opened and closed.
And S3, judging the fluctuation change of the pressure of the main oil gallery between the opening and the 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 gallery of the engine, and closes the VVT after the fluctuation condition of the pressure of the main oil gallery of the engine is collected.
And S4, if the pressure fluctuation of the main oil gallery is in a preset range, controlling the engine to operate in a fault operation 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 operation state, and meanwhile, the PCJ is forcibly opened, so that the main oil duct pressure of the engine is reduced, and oil leakage of sealing elements of lubricating systems such as a filter and the like is avoided.
In the fault processing method, the variable valve timing is controlled to be opened and closed, and the fluctuation condition of the main oil gallery pressure is judged, so that the fault is diagnosed. When the pressure fluctuation of the main oil gallery is within a preset range, the piston cooling nozzle is opened, and the engine runs in a fault running state, so that the driving experience of a user is improved.
In the running process of the engine, when the condition that the pressure of a main oil gallery of the engine is greater than the highest threshold value of a lubricating system is detected, the ECU displays first-class oil pressure alarm information on an automobile display screen to remind a client of high-pressure failure, and simultaneously controls the variable valve to be opened in a timing manner and obtains the oil pressure of the main oil gallery, if the oil pressure of the main oil gallery is reduced and the reduction range is in a preset range at the moment, the variable valve timing oil way is indicated to be free of blockage, the ECU controls the piston cooling nozzle to be opened for reducing the oil pressure of the main oil gallery, a passenger can drive the engine to a nearby repair shop to maintain the engine in a failure running state, and when the pressure of the main oil gallery is greater than the highest threshold value of the lubricating system, the automobile engine stops working to cause traffic accidents.
In one embodiment, as shown in fig. 2, S3, determining the fluctuation range of the main gallery pressure between the opening and closing of the VVT, further includes:
and S5, if the fluctuation of the pressure of the main oil gallery is not in a preset range, indicating that the engine stops running.
Specifically, when the fluctuation of the main oil gallery pressure is smaller than the preset range, the VVT is located on the tail end oil path of the engine, the tail end oil path of the engine is judged to be blocked, the engine cannot continue to operate at the moment, the ECU informs a customer of immediately stopping the engine, the engine is prohibited from being started again, and the customer can transport the automobile to a maintenance shop for maintenance by calling a trailer. If the oil circuit at the tail end of the engine is blocked, the engine continues to run, and great damage is caused to the engine.
The engine lubricating system comprises an engine oil path system and oil consumption components, wherein the oil consumption components comprise a main shaft bushing, 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 path at the tail end of an engine.
In one embodiment, when the engine is in a failure operation state, the rotation speed of the engine is less than or equal to 1000rpm, and the vehicle speed is less than or equal to 30km/h. Specifically, when the pressure of a main oil duct of the engine is greater than the maximum threshold value of a 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 after the PCJ is controlled to be forcibly opened, the flow demand of the engine is suddenly increased by about 30%, the pressure of the main oil duct can be suddenly reduced by 200-500 kPa, the oil pressure can be reduced to the pressure-resistant range of the lubricating system when the engine runs at low speed, and the oil leakage of sealing elements of the lubricating systems such as a mechanical filter and the like can be ensured. And along with the low-speed running of the engine, the temperature of the engine oil gradually rises, the viscosity of the engine oil drops, the flow resistance of the engine oil of the lubricating system is reduced at the moment, and the pressure of the engine oil also drops. In particular, a temperature sensor can be arranged on the main oil gallery for detecting the oil temperature of the main oil gallery at different times, when the read oil temperature is less than a preset value, for example, the preset value is set to be 75 degrees, the rotating speed of the engine is set to be less than or equal to 1000rpm, the vehicle speed is set to be less than or equal to 30km/h, when the read oil temperature is greater than the preset value, the rotating speed of the engine can be increased to 1100rpm, and the vehicle speed can be increased to 40km/h, so that the engine can reach a nearby maintenance shop more quickly in a fault running state.
In one embodiment, the predetermined range is 20 to 50kPa. Specifically, the fluctuation range of the main gallery pressure may be measured on a test bench. The method comprises the steps that under different main oil duct pressures, the VVT is forcibly started, the flow of 2-3L of engine oil is suddenly increased, at the moment, the oil pressure of the main oil duct is reduced, the oil pressure of the main oil duct is tested for multiple times to obtain a plurality of oil pressure reduction amplitude values, the minimum value and the maximum value of the 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 bench, the main oil gallery pressure value is 1000KPa, and after the VVT is forcibly started, the main oil gallery pressure value is reduced to 950KPa, and the oil pressure drop amplitude value is 50KPa. For example, when the engine is started on a test bench, the main oil gallery pressure value is 950KPa, and after the VVT is forcibly started, the main oil gallery pressure value is reduced to 930KPa, and the oil pressure drop amplitude value is 20KPa. And acquiring the maximum value and the minimum value in the oil pressure drop amplitude values under different main oil gallery pressures to obtain a preset range.
In an embodiment, as shown in fig. 3, the fault handling method further includes the following steps:
s6, if the pressure of the main oil gallery is between the highest threshold of the lubricating system and the pressure relief threshold of the oil pump, the engine continues to run in the original state, and the variable valve is controlled to be opened and closed in a timing mode, wherein the pressure relief threshold is an oil pressure threshold of the oil pump pressure relief valve;
s7, judging the fluctuation change of the pressure of the main oil gallery between the opening and the closing of the variable valve timing;
and S8, if the pressure fluctuation of the main oil gallery is within the preset range, sending a fault indication of the oil pump pressure relief valve.
Specifically, if the acquired pressure of the main oil gallery is between the highest threshold of the lubricating system and the pressure relief threshold of the oil pump, the engine continues to operate in the original state, and the VVT is controlled to be opened and closed, wherein the pressure relief threshold is an oil pressure threshold of the oil pump pressure relief valve. For example, if the pressure of the main oil gallery is read to be greater than the pressure relief threshold of the oil pump and less than the highest threshold of the lubricating system in the running process of the vehicle, the oil pressure of the lubricating system cannot trigger an alarm, and the engine cannot be damaged or leak oil when continuously running. And the ECU controls the VVT to be opened, acquires the fluctuation value of the pressure of the main oil duct again, if the fluctuation value of the pressure of the main oil duct is in a preset range, and indicates that the tail end oil way of the lubricating system where the VVT is located is not blocked, the tail end oil way is caused by the fact that a pressure release valve of the oil pump cannot be opened, meanwhile, the ECU informs a client of abnormal oil pressure through an instrument panel, and the engine can continuously run to a nearby maintenance shop to be checked and maintained.
In an embodiment, the fault handling method further includes: and if the pressure of the main oil gallery is between the pressure relief threshold value and the lowest threshold value of the lubricating system, the engine continues to run in the original state.
Specifically, in the running process of the automobile, the fact that the pressure of the main oil gallery is smaller than the pressure release valve and larger than the lowest threshold value of the lubricating system is read, the engine oil pressure is in a normal range, the pressure release valve is in a closed state, and the engine continues to run according to normal working conditions. It should be noted that the minimum threshold of the lubrication system is the minimum oil pressure requirement for ensuring the normal operation lubrication function of the engine when the engine runs at idle speed.
In an embodiment, the fault handling method further includes: and if the pressure of the main oil gallery is less than or equal to the lowest threshold value of the lubricating system, giving out a second type of oil pressure alarm, indicating that the engine stops running, and forbidding the engine to start. Specifically, in the running process of the automobile, the fact that the pressure of the main oil gallery is smaller than or equal to the lowest threshold value of the lubricating system is read, the oil pressure of the lubricating system cannot maintain the lubricating requirement of the engine during running, the engine can be seriously damaged when the engine is continuously run, and the ECU sends out a second type of oil pressure alarm through an instrument panel to inform a customer of immediately stopping the automobile and forbid the engine from being started again. Wherein, the second type oil pressure alarm is an engine oil low pressure alarm.
In one embodiment, the lowest threshold value of the lubrication system, the pressure relief threshold value of the oil pump and the highest threshold value of the lubrication system are sequentially increased. Specifically, the minimum threshold of the lubricating system is the minimum oil pressure requirement for guaranteeing the normal operation of the engine and the lubricating function when the engine runs at idle speed, and when the oil pressure of the lubricating system is lower than the minimum threshold of the lubricating system, the engine runs to cause mechanical damage to oil consumption parts, and cylinder scuffing and tile holding can be caused seriously. The pressure relief threshold value of the oil pump can be obtained from the production specification sheet of the oil pump, and when the oil pressure of the lubricating system is larger than the pressure relief threshold value of the oil pump, the pressure relief valve is opened to reduce the oil pressure of the lubricating system. The highest threshold value of the lubricating system is the highest pressure-resistant value of the lubricating system, and when the oil pressure of the lubricating system exceeds the highest threshold value of the lubricating system, the risk of oil leakage of sealing elements of the lubricating system such as a mechanical filter and a sealing ring can occur. The minimum 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 maximum threshold value of the lubricating system. For example, the minimum threshold of the lubricating system is 50kPa, the pressure relief threshold of the oil pump is 700kPa, and the maximum threshold of the lubricating system is 1200kPa.
As shown in fig. 4, an 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-mentioned fault handling method for the lubrication system of the engine, and the fault handling system 100 includes an oil pressure obtaining module 110, a switching module 120, and a control module 130, where the oil pressure obtaining module 110 is configured to obtain main oil gallery pressures of the lubrication system at different times. The switch module 120 is used to control variable valve timing opening and closing and opening of the piston cooling jets. The control module 130 is configured to perform a judgment according to the main oil gallery 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 acquiring module 110 acquires the main oil gallery pressure of the lubricating system at different times through a pressure sensor installed on the main oil gallery. The control module 130 performs size judgment on the acquired main oil gallery pressure, the highest threshold and the lowest threshold of the lubricating system and a pressure release valve of the oil pump. For example, when the control module 130 determines that the main gallery pressure is greater than the maximum threshold value of the lubrication system, the control module 130 controls the switch module 120 to turn the VVT on, the oil pressure acquisition module 110 acquires the main gallery pressure again, the switch module 120 turns the VVT off, and if the main gallery pressure drop is within a predetermined range, the switch module 120 forces the PCJ on.
In one embodiment, the fault handling system 100 further includes an alarm module for issuing a first type oil pressure alarm or a second type oil pressure alarm. Specifically, when the control module judges that the pressure of the main oil gallery is larger than the highest threshold value of the lubricating system, the alarm module sends out a first type of oil pressure alarm to prompt that the oil pressure of the lubricating system is too high. When the module judges that the pressure of the main oil gallery is smaller than the minimum threshold value of the lubricating system, the alarm module sends out a second type of oil pressure alarm to prompt that the oil pressure of the lubricating system is too low, and informs a customer of stopping immediately. When the control module judges that the main oil gallery pressure is greater than the pressure relief threshold value of the oil pump and smaller than the highest threshold value of the lubricating system, the control module 130 opens the VVT through the switch module 120, the oil pressure acquisition module 110 acquires the fluctuation value of the main oil gallery pressure again, if the fluctuation value of the main oil gallery pressure is in the preset range, the alarm module sends out a fault indication of the oil pump pressure relief valve, and meanwhile, the switch module 120 forcibly opens the PCJ to prompt a customer that the customer can continue to run, but the customer needs to drive the vehicle to a nearby maintenance shop to check and maintain as soon as possible.
In order to better understand the fault handling method for the lubrication system of the engine according to the embodiment of the present application, a fault handling method process is described below with reference to fig. 5.
The engine lubricating system comprises an engine oil way system and oil components such as a main shaft bush, a connecting rod bush, 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 a PCJ controlled by a solenoid valve, the on-off control of the solenoid valve is adopted to control whether to open the PCJ oil injection cooling piston, and when the PCJ is suddenly opened, the oil pressure of a main oil passage is suddenly reduced due to the sudden and large increase of the flow demand of an engine lubricating system. And the oil pressure drop amplitude is related to the engine oil temperature, and the lower the oil temperature, the greater the oil pressure drop.
When the VVT of the engine is switched on and off, the volume of an actuating mechanism of the VVT needs to be filled with engine oil, so that the flow demand of a lubricating system of the engine is increased in a short time, the oil pressure of a main oil passage of the engine is suddenly reduced by about 20-50 kPa, and the oil pressure of the lubricating system is recovered to be stable after the switching of the opening and the closing of the VVT is finished.
An engine oil pressure sensor is arranged in a main oil gallery of an engine lubricating system, and when the oil pressure sensor detects a fault of high engine oil pressure, the fault may be caused by that an engine oil pump pressure relief valve fails to open or an oil way at the rear end of the main oil gallery is blocked. When the oil pressure sensor detects a fault that the engine oil pressure is low, the fault may be caused by the fact that the engine oil pressure relief valve is stuck in an open state and cannot be closed or the oil passage leaks. Different failure modes need to adopt different strategies, and the vehicle is ensured not to be anchored on the premise of ensuring the safe operation of the engine.
For example, the engine main gallery pressure sensor reads that the oil pressure is P, the oil pump relief valve opening oil pressure is set to P1, the lubrication system oil pressure lower limit alarm value is P2, and the lubrication system oil pressure upper limit alarm value is P3. In particular, P1 is set to 700kPa, P2 is set to 50kPa, P3 is set to 1200kPa, wherein P2 is the lowest pressure requirement for ensuring the normal lubricating function of the engine when the engine runs at idle speed, P3 is the highest pressure resistance of the lubricating system, and oil leakage of the sealing parts of the lubricating system such as a filter can occur when P3 is exceeded. There are 4 oil pressure states for a conventional fixed displacement oil pump as follows:
1. when P is more than or equal to P3, high-voltage fault alarm can be triggered, and the high-voltage fault alarm can be generated only under the following two conditions: 1) When the engine oil temperature is low and the engine oil pressure release valve cannot be opened, the engine oil viscosity is high due to low engine oil temperature, the engine oil flow resistance is large, the oil pressure of a main oil duct of the engine is high, and at the moment, redundant engine oil needs to be discharged through the engine oil pressure release valve; 2) When the tail end oil path of the engine is blocked and the oil pump pressure release valve fails to open, the oil flow resistance is large due to the blockage of the tail end oil path, the oil pressure of the main oil path is high when the engine runs, redundant engine oil needs to be discharged through the oil pump pressure release valve, and if the oil pump pressure release valve cannot be opened, the oil pressure can continuously rise to cause high-pressure alarm. If high-pressure alarm is met, controlling the VVT to be opened and closed, observing the oil pressure fluctuation condition of a main oil passage of the engine, if the oil pressure of the main oil passage of the engine is reduced by about 20-50 kPa, indicating that the VVT oil passage is not blocked, and because the VVT belongs to an end oil passage of the engine, indicating that the end oil passage of the engine is not blocked, judging that an oil pump pressure release valve cannot be opened at the moment, controlling the engine to operate in a first working condition (fault operation mode) under the condition, reminding a client of high-pressure fault, and driving to a repair shop to inspect and repair through the fault mode; if the oil pressure of the main oil duct of the engine is not fluctuated when the VVT is opened and closed, the oil way at the tail end of the engine is judged to be blocked, the engine cannot continue to run at the moment, a client is informed to stop immediately, the engine is forbidden to be started again, and the safety of the engine is ensured.
The working condition I is as follows: the engine is controlled to rotate at a speed of less than or equal to 1000rpm and at a speed of less than or equal to 30km/h, the PCJ is forced to be opened in the whole process, when P is greater than or equal to P3 and an oil circuit at the tail end of the engine is not blocked, the engine continues to operate at a low speed, although the engine cannot be damaged, oil leakage of lubricating system sealing elements such as a mechanical filter can be caused due to high oil pressure, at the moment, the engine is controlled to operate under a working condition I, the PCJ is forced to be opened, the flow demand of the engine is suddenly increased by about 30%, the oil pressure of a main oil duct can be reduced by 200-500 kPa, the oil pressure can be reduced within the pressure-resistant range of the lubricating system when the engine operates at the low speed, and oil leakage of the lubricating system sealing elements such as the mechanical filter can be ensured. And along with the temperature rise of the engine oil, the viscosity of the engine oil is reduced, the flow resistance of the engine oil of the lubricating system is reduced at the moment, and the pressure of the engine oil is also continuously reduced.
2. When P1 is less than or equal to P and less than P3, the engine oil pressure cannot give an alarm, and the engine cannot be damaged or leak oil during operation. At the moment, the engine can continuously run according to normal working conditions generally caused by the fact that the oil pump pressure relief valve cannot be opened, but the engine is informed to a client through an instrument that the oil pressure is abnormal, and the engine needs to be checked and maintained by a nearby maintenance shop.
3. When P2 is more than P and 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 low pressure gives an alarm, the pressure of a lubricating system cannot maintain the lubricating requirement when the engine runs, the engine can be seriously damaged when the engine continues to run, a client is informed to stop immediately at the moment, the engine is forbidden to be started again, and the safety of the engine is ensured.
The above embodiments are only used to illustrate the technical solutions of the present application, and not to limit them; 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 various changes may be made and equivalents may be substituted for elements thereof; such modifications and substitutions do not depart from the spirit and scope of the corresponding technical solutions as claimed herein.
Claims (10)
1. A method of fault handling for a lubrication system of an engine, comprising:
acquiring the pressure of a main oil gallery of an engine;
if the pressure of the main oil gallery is greater than the highest threshold value of the lubricating system, a first type of oil pressure alarm is sent out, and the variable valve is controlled to be opened and closed in a timing mode;
judging fluctuation change of the main oil gallery pressure between opening and closing of the variable valve timing;
if the pressure fluctuation of the main oil gallery is within a preset range, controlling the engine to operate in a fault operation state;
wherein the engine opens a piston cooling nozzle to reduce the main gallery pressure when in a failed operating condition.
2. The fault handling method according to claim 1, wherein the fault handling method further comprises:
and if the pressure fluctuation of the main oil gallery is not in the preset range, indicating that the engine stops running.
3. The failure handling method according to claim 1, wherein the engine is rotated at 1000rpm or less and at 30km/h or less in the failed operating state.
4. The fault handling method according to claim 1, wherein the predetermined range is 20 to 50kPa.
5. The fault handling method according to claim 1, wherein the fault handling method further comprises:
if the pressure of the main oil gallery is between the highest threshold of the lubricating system and the pressure relief threshold of the oil pump, the engine continues to operate in the original state, and the variable valve is controlled to be opened and closed in a timing mode, wherein the pressure relief threshold is an oil pressure threshold of the oil pump pressure relief valve;
judging fluctuation change of the main oil gallery pressure between opening and closing of the variable valve timing;
and if the pressure fluctuation of the main oil gallery is within the preset range, sending a fault indication of the oil pump pressure relief valve.
6. The fault handling method according to claim 5, wherein the fault handling method further comprises:
and if the pressure of the main oil gallery is between the pressure relief threshold value and the lowest threshold value of the lubricating system, the engine continues to operate in the original state.
7. The fault handling method according to claim 6, wherein the fault handling method further comprises:
and if the pressure of the main oil gallery is less than or equal to the lowest threshold value of the lubricating system, a second type of oil pressure alarm is sent out, the engine is indicated to stop running, and the engine is prohibited from starting.
8. The fault handling method of claim 7, wherein the minimum threshold of the lubrication system, the pressure relief threshold of the oil pump, and the maximum threshold of the lubrication system are sequentially incremented.
9. A fault handling system for a lubrication system of an engine, the fault handling system being configured to perform the fault handling method for the lubrication system of the engine of any one of claims 1 to 8, the fault handling system comprising: an oil pressure acquisition module, a switch module and a control module, wherein,
the oil pressure acquisition module is used for acquiring the pressure of a main oil gallery of the lubricating system at different moments;
the switch module is used for controlling the timing opening and closing of the variable valve and the opening of the piston cooling nozzle
And the control module is used for judging according to the pressure of the main oil gallery, the highest threshold and the lowest threshold of the lubricating system and the pressure relief threshold of the oil pump so as to control the switch module.
10. The fault handling system of claim 9, further comprising an alarm module for issuing a first type oil pressure alarm or a second type oil pressure alarm.
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