CN111720231B - Method and system for post-processing fault of engine oil rail pressure sensor - Google Patents

Method and system for post-processing fault of engine oil rail pressure sensor Download PDF

Info

Publication number
CN111720231B
CN111720231B CN202010453387.1A CN202010453387A CN111720231B CN 111720231 B CN111720231 B CN 111720231B CN 202010453387 A CN202010453387 A CN 202010453387A CN 111720231 B CN111720231 B CN 111720231B
Authority
CN
China
Prior art keywords
oil pump
engine
pct
capacity
pressure
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Active
Application number
CN202010453387.1A
Other languages
Chinese (zh)
Other versions
CN111720231A (en
Inventor
秦龙
刘磊
李京
张德全
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Dongfeng Motor Corp
Original Assignee
Dongfeng Motor Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Dongfeng Motor Corp filed Critical Dongfeng Motor Corp
Priority to CN202010453387.1A priority Critical patent/CN111720231B/en
Publication of CN111720231A publication Critical patent/CN111720231A/en
Application granted granted Critical
Publication of CN111720231B publication Critical patent/CN111720231B/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Images

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D41/00—Electrical control of supply of combustible mixture or its constituents
    • F02D41/30—Controlling fuel injection
    • F02D41/38—Controlling fuel injection of the high pressure type
    • F02D41/40—Controlling fuel injection of the high pressure type with means for controlling injection timing or duration
    • F02D41/406—Electrically controlling a diesel injection pump
    • 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
    • F02D13/0203—Variable control of intake and exhaust valves
    • F02D13/0215—Variable control of intake and exhaust valves changing the valve timing only
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D31/00—Use of speed-sensing governors to control combustion engines, not otherwise provided for
    • F02D31/001—Electric control of rotation speed
    • F02D31/007—Electric control of rotation speed controlling fuel supply
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D37/00—Non-electrical conjoint control of two or more functions of engines, not otherwise provided for
    • F02D37/02—Non-electrical conjoint control of two or more functions of engines, not otherwise provided for one of the functions being ignition
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D41/00—Electrical control of supply of combustible mixture or its constituents
    • F02D41/0002—Controlling intake air
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D41/00—Electrical control of supply of combustible mixture or its constituents
    • F02D41/0025—Controlling engines characterised by use of non-liquid fuels, pluralities of fuels, or non-fuel substances added to the combustible mixtures
    • F02D41/003—Adding fuel vapours, e.g. drawn from engine fuel reservoir
    • F02D41/0032—Controlling the purging of the canister as a function of the engine operating conditions
    • F02D41/004—Control of the valve or purge actuator, e.g. duty cycle, closed loop control of position
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D41/00—Electrical control of supply of combustible mixture or its constituents
    • F02D41/0025—Controlling engines characterised by use of non-liquid fuels, pluralities of fuels, or non-fuel substances added to the combustible mixtures
    • F02D41/0047—Controlling exhaust gas recirculation [EGR]
    • F02D41/0077—Control of the EGR valve or actuator, e.g. duty cycle, closed loop control of position
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D41/00—Electrical control of supply of combustible mixture or its constituents
    • F02D41/24—Electrical control of supply of combustible mixture or its constituents characterised by the use of digital means
    • F02D41/2406—Electrical control of supply of combustible mixture or its constituents characterised by the use of digital means using essentially read only memories
    • F02D41/2425—Particular ways of programming the data
    • F02D41/2429—Methods of calibrating or learning
    • F02D41/2441—Methods of calibrating or learning characterised by the learning conditions
    • F02D41/2448—Prohibition of learning
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D41/00—Electrical control of supply of combustible mixture or its constituents
    • F02D41/30—Controlling fuel injection
    • F02D41/38—Controlling fuel injection of the high pressure type
    • F02D41/40—Controlling fuel injection of the high pressure type with means for controlling injection timing or duration
    • F02D41/401—Controlling injection timing
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02P—IGNITION, OTHER THAN COMPRESSION IGNITION, FOR INTERNAL-COMBUSTION ENGINES; TESTING OF IGNITION TIMING IN COMPRESSION-IGNITION ENGINES
    • F02P5/00—Advancing or retarding ignition; Control therefor
    • F02P5/04—Advancing or retarding ignition; Control therefor automatically, as a function of the working conditions of the engine or vehicle or of the atmospheric conditions
    • F02P5/145—Advancing or retarding ignition; Control therefor automatically, as a function of the working conditions of the engine or vehicle or of the atmospheric conditions using electrical means
    • F02P5/15—Digital data processing
    • F02P5/1502—Digital data processing using one central computing unit
    • F02P5/151—Digital data processing using one central computing unit with means for compensating the variation of the characteristics of the engine or of a sensor, e.g. by ageing
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D2250/00—Engine control related to specific problems or objectives
    • F02D2250/18—Control of the engine output torque
    • F02D2250/26—Control of the engine output torque by applying a torque limit

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Theoretical Computer Science (AREA)
  • Signal Processing (AREA)
  • Combined Controls Of Internal Combustion Engines (AREA)

Abstract

The invention discloses a method and a system for post-processing faults of an engine oil rail pressure sensor, and relates to the field of engine control. The method comprises the following steps: when an engine oil rail pressure sensor fails, acquiring the working state of an engine; when the working state shows that the engine is in a starting state and the working state of each cylinder is not identified, carrying out pressurization by adopting the maximum pressurization capacity preset in the pressurization capacity mapping table through the high-pressure oil pump; after the preset time, the high-pressure oil pump stops supercharging; or after the working state of each cylinder is identified, analyzing the supercharging capacity pct of the high-pressure oil pump according to the engine speed n, the current target oil pressure p, the fuel temperature T, the vehicle storage battery voltage U and a corresponding mapping table, and supercharging according to the pct through the high-pressure oil pump. When any fault occurs in the oil rail pressure sensor, the fuel oil pressure control of the engine can still be controlled at a high safety oil pressure, and the engine is prevented from being flameout.

Description

Method and system for post-processing fault of engine oil rail pressure sensor
Technical Field
The invention relates to the field of engine control, in particular to a fault post-processing method and system for an engine oil rail pressure sensor.
Background
The gasoline engine oil rail pressure sensor is a sensor of high-pressure common rail fuel pressure, is an important part of a fuel injection system of a direct injection engine, and is used for feeding back an oil pressure signal of oil rail pressure control. The requirement on fuel pressure is different under different engine working conditions, and the requirement on fuel pressure is higher during low-temperature starting, so that atomization is improved; under normal working conditions, cylinder wall wetting easily occurs due to too high oil pressure, and excessive internal consumption of the engine is caused, so that the fuel pressure is important.
In the process of implementing the invention, the inventor finds that at least the following problems exist in the prior art: when the oil rail pressure sensor breaks down, the engine can be directly prevented from being started, a user is required to transport the vehicle to a maintenance point for maintenance, and if the vehicle is in a remote area when the fault occurs, the vehicle is inconvenient to transport.
Disclosure of Invention
The invention aims to overcome the defects of the background technology and provide a method and a system for processing the fault after the oil rail pressure sensor of the engine.
In a first aspect, a method for processing fault after an engine oil rail pressure sensor is provided, which includes the following steps:
when an engine oil rail pressure sensor fails, acquiring the working state of an engine;
when the working state shows that the engine is in a starting state and the working state of each cylinder is not identified, carrying out pressurization by adopting the maximum pressurization capacity preset in the pressurization capacity mapping table through the high-pressure oil pump;
after the preset time, the high-pressure oil pump stops supercharging; or the like, or, alternatively,
after the working state of each cylinder is identified, the supercharging capacity pct of the high-pressure oil pump is analyzed according to the engine speed n, the current target oil pressure p, the fuel temperature T, the vehicle storage battery voltage U and a corresponding mapping table, and supercharging is carried out through the high-pressure oil pump according to the pct.
According to the first aspect, in a first possible implementation manner of the first aspect, before acquiring the operating state of the engine when the engine rail pressure sensor fails, the method further includes the following steps:
and acquiring a pressurization capacity mapping table corresponding to the parameters of the high-pressure oil pump and the pressurization capacity of the high-pressure oil pump.
According to the first aspect, in a second possible implementation manner of the first aspect, the analyzing the high-pressure oil pump supercharging capacity pct according to the engine speed n, the current target oil pressure p, the fuel temperature T, the vehicle battery voltage U and a corresponding mapping table specifically includes the following steps:
determining a basic boost capability pct according to n, p and corresponding mapping tables0；
Determining a first compensation coefficient k of the pressurization capacity of the high-pressure oil pump according to T and a corresponding mapping table1；
Determining a second compensation coefficient k of the pressurization capacity of the high-pressure oil pump according to the U and a corresponding mapping table2；
According to pct0、k1And k2And calculating the pct.
According to a second possible implementation manner of the first aspect, in a third possible implementation manner of the first aspect, before acquiring the operating state of the engine when the rail pressure sensor fails, the method further includes the following steps:
acquiring the pressurization capacity of a first high-pressure oil pump under different n and p parameters at preset fuel temperature and preset vehicle storage battery voltage, and defining the pressurization capacity of the first high-pressure oil pump as pct0And establish n, p and pct0A corresponding mapping table;
obtaining a different pct at a preset vehicle battery voltage0And a second high-pressure oil pump pressure boost capability under T, according to the second high-pressure oil pump pressure boost capability and pct0Determining k1Establishing n, p, T and k1A corresponding mapping table;
obtaining different pct at preset fuel temperature0And the boosting capacity of a third high-pressure oil pump under the U is determined according to the boosting capacity of the third high-pressure oil pump and the pct0Determining k2Establishing n, p, U and k2A corresponding mapping table.
According to the first aspect, in a fourth possible implementation manner of the first aspect, after the operating state of each cylinder is identified, the method further includes the following steps after analyzing the high-pressure oil pump supercharging capacity pct according to the engine speed n, the current target oil pressure p, the fuel temperature T, the vehicle battery voltage U and a corresponding mapping table:
controlling the oil injection pulse width according to p in the running process of the engine; adjusting the lowest idling speed of the engine to a preset speed; controlling an ignition angle and knocking by adopting the octane number of a preset oil product; adjusting the external characteristic torque of the engine to a preset threshold value; the fuel oil is corrected for a long time and is not activated by self learning; and the preset elements stop working, and the preset elements are relays and electromagnetic valve electric appliances influencing the air charging efficiency or the air-fuel ratio.
In a second aspect, a system for processing a fault after an oil rail pressure sensor is provided, comprising:
a state acquisition module to: when the oil rail pressure sensor fails, acquiring the working state of the engine;
an oil pump pressurization module connected with the state acquisition module for: when the working state shows that the engine is in a starting state and the working state of each cylinder is not identified, adopting the maximum supercharging capacity preset in the supercharging capacity mapping table to carry out supercharging;
the oil pump pressurization module is further configured to: after the preset time, stopping pressurizing; or the like, or, alternatively,
the boost capacity analysis module is used for analyzing the boost capacity pct of the high-pressure oil pump according to the engine speed n, the current target oil pressure p, the fuel temperature T, the vehicle storage battery voltage U and a corresponding mapping table after identifying the working state of each cylinder;
the oil pump pressurization module is further used for: the boost was performed as per pct.
According to the second aspect, in a first possible implementation manner of the second aspect, the boost capability analysis module specifically includes:
a basic capability determining unit to: determining a basic boost capability pct according to n, p and corresponding mapping tables0；
A coefficient determination unit for: determining a first compensation coefficient k of the pressurization capacity of the high-pressure oil pump according to T and a corresponding mapping table1(ii) a Determining a second compensation coefficient k of the pressurization capacity of the high-pressure oil pump according to the U and a corresponding mapping table2；
A calculating unit, connected to the basic capability determining unit and the coefficient determining unit, for: according to pct0、k1And k2Calculating pct。
According to the first possible implementation manner of the second aspect, in a second possible implementation manner of the second aspect, the method further includes:
the data acquisition module is connected with the oil pump pressurization module and used for: and acquiring a pressurization capacity mapping table corresponding to the parameters of the high-pressure oil pump and the pressurization capacity of the high-pressure oil pump.
According to a second possible implementation manner of the second aspect, in a third possible implementation manner of the second aspect, the method further includes:
the data acquisition module is connected with the supercharging capacity analysis module and is further used for: acquiring the pressurization capacity of a first high-pressure oil pump under different n and p parameters at preset fuel temperature and preset vehicle storage battery voltage, and defining the pressurization capacity of the first high-pressure oil pump as pct0And establish n, p and pct0A corresponding mapping table; obtaining a different pct at a preset vehicle battery voltage0And a second high-pressure oil pump pressure boost capability under T, according to the second high-pressure oil pump pressure boost capability and pct0Determining k1Establishing n, p, T and k1A corresponding mapping table; obtaining different pct at preset fuel temperature0And the boosting capacity of a third high-pressure oil pump under the U is determined according to the boosting capacity of the third high-pressure oil pump and the pct0Determining k2Establishing n, p, U and k2A corresponding mapping table.
According to the second aspect, in a fourth possible implementation manner of the second aspect, the method further includes:
a control module connected to the oil pump pressurization module for: controlling the oil injection pulse width according to p in the running process of the engine; adjusting the lowest idling speed of the engine to a preset speed; controlling an ignition angle and knocking by adopting the octane number of a preset oil product; adjusting the external characteristic torque of the engine to a preset threshold value; the fuel oil is corrected for a long time and is not activated by self learning; and the preset elements stop working, and the preset elements are relays and electromagnetic valve electric appliances influencing the air charging efficiency or the air-fuel ratio.
Compared with the prior art, when the oil rail pressure sensor has any fault, the fuel oil pressure control of the engine can still be controlled by higher safety oil pressure, and the engine is prevented from being flameout.
Drawings
FIG. 1 is a schematic flow chart diagram of an embodiment of a method for post-processing a fault in an engine rail pressure sensor of the present invention;
FIG. 2 is a schematic flow chart diagram illustrating a method for handling an engine rail pressure sensor fault after-treatment in accordance with another embodiment of the present invention;
FIG. 3 is a schematic flow chart diagram illustrating a method for handling an engine rail pressure sensor fault after-treatment in accordance with another embodiment of the present invention;
FIG. 4 is a schematic structural diagram of an embodiment of a system for handling an engine rail pressure sensor failure according to the present invention.
Detailed Description
In order that those skilled in the art will better understand the present invention, the following detailed description of the invention is provided in conjunction with the accompanying drawings and the detailed description of the invention.
Referring to fig. 1, an embodiment of the present invention provides a method for processing a fault after a pressure sensor of an engine oil rail, including the following steps:
when an engine oil rail pressure sensor fails, acquiring the working state of an engine;
when the working state shows that the engine is in a starting state and the working state of each cylinder is not identified, carrying out pressurization by adopting the maximum pressurization capacity preset in the pressurization capacity mapping table through the high-pressure oil pump;
after the preset time, the high-pressure oil pump stops supercharging; or the like, or, alternatively,
after the working state of each cylinder is identified, the supercharging capacity pct of the high-pressure oil pump is analyzed according to the engine speed n, the current target oil pressure p, the fuel temperature T, the vehicle storage battery voltage U and a corresponding mapping table, and supercharging is carried out through the high-pressure oil pump according to the pct.
Specifically, in this embodiment, when a circuit fault occurs in the engine rail pressure sensor, or the signal detection of the rail pressure sensor is not reliable, that is, the engine rail pressure sensor has a fault, the operating state of the engine is acquired.
If the engine is in a stop state, the working capacity of the high-pressure oil pump does not need to be processed, and only a user needs to be reminded of the fault of the oil rail pressure sensor.
If the engine is in a starting state, but the engine is still in a cylinder detection state at present, namely the engine is in a working state of identifying each cylinder, judging that each cylinder is in different states of oil injection, ignition, pressurization and the like respectively, and performing pressurization by adopting the maximum pressurization capacity preset in the mapping table through the high-pressure oil pump. At this time, since the engine rail pressure sensor fails, supercharging is performed with a preset maximum supercharging capacity, and sufficient work performance such as an amount of fuel injection is ensured even if the performance is excessive. The preset maximum supercharging capacity depends on the working performance of the high-pressure oil pump, and is generally the maximum supercharging capacity of the high-pressure oil pump.
When the high-pressure oil pump is pressurized with the preset maximum pressurization capacity, in one case, after the high-pressure oil pump is pressurized with the preset maximum pressurization capacity for the preset time, the engine still does not completely recognize the working state of each cylinder, and therefore, the high-pressure oil pump stops the pressurization after the high-pressure oil pump is pressurized with the preset maximum pressurization capacity for the preset time. The other condition is that when the high-pressure oil pump is not pressurized by adopting the preset maximum pressurization capacity for the preset time, the engine already identifies the working state of each cylinder, at the moment, the high-pressure oil pump does not adopt the preset maximum pressurization capacity for pressurization any more, but obtains the engine speed n, the current target oil pressure p, the fuel temperature T and the vehicle storage battery voltage U, analyzes the pressurization capacity pct of the high-pressure oil pump by combining with a corresponding mapping table, and performs pressurization according to the pct through the high-pressure oil pump.
This application when any trouble appears in oil rail pressure sensor, engine fuel oil pressure control still can be with higher safe oil pressure control, avoids the engine to stall, guarantees vehicle power take off as far as possible, guarantees that the driver can drive the vehicle to the maintenance shop and maintain, guarantees vehicle personal safety and vehicle life simultaneously.
Preferably, in a further embodiment of the present invention, before acquiring the operating state of the engine when the engine rail pressure sensor fails, the method further comprises the following steps:
and acquiring a pressurization capacity mapping table corresponding to the parameters of the high-pressure oil pump and the pressurization capacity of the high-pressure oil pump.
Specifically, in this embodiment, a pressure boost capability mapping table corresponding to parameters of the high-pressure oil pump and a pressure boost capability of the high-pressure oil pump is obtained, the maximum pressure boost capability of the high-pressure oil pump is defined to be 100%, the minimum pressure boost capability of the high-pressure oil pump is defined to be 0%, the pressure boost capability of the high-pressure oil pump is limited between the maximum pressure boost capability and the minimum pressure boost capability, working parameters corresponding to different pressure boost capabilities of the high-pressure oil pump, such as an oil suction stroke, an oil return stroke, an oil pumping stroke and the like, are obtained, a corresponding pressure boost capability mapping table of the high-pressure oil pump is produced according to the working parameters corresponding to the different pressure boost capabilities of the high-pressure oil pump, and after the pressure boost capability of the high-pressure oil pump is obtained through calculation, the corresponding working parameters can be obtained through checking the pressure boost capability mapping table and executed by the high-pressure oil pump.
In the application, the working state of the high-pressure oil pump is quantized by defining the supercharging capacity of the high-pressure oil pump and a corresponding supercharging capacity mapping table, so that the calculation is performed through other engine parameters, and the working state of the high-pressure oil pump is adjusted in real time.
Referring to fig. 2, another embodiment of the present invention provides a method for processing a fault after a rail pressure sensor of an engine, which is an optimized embodiment of the above embodiment, and the method for analyzing a boost capability pct of a high-pressure oil pump according to an engine speed n, a current target oil pressure p, a fuel temperature T, a vehicle battery voltage U, and a corresponding mapping table specifically includes the following steps:
determining a basic boost capability pct according to n, p and corresponding mapping tables0；
Determining a first compensation coefficient k of the pressurization capacity of the high-pressure oil pump according to T and a corresponding mapping table1；
Determining a second compensation coefficient k of the pressurization capacity of the high-pressure oil pump according to the U and a corresponding mapping table2；
According to pct0、k1And k2And calculating the pct.
Specifically, in the present embodiment, the engine speed n, the current target oil pressure p, the fuel temperature T, and the vehicle battery voltage U are obtained, n and p are main factors that affect the supercharging capacity of the high-pressure oil pump, the influence of each parameter on the supercharging capacity of the high-pressure oil pump can be determined by adopting a single variable method, and when one engine parameter is changed, the change of the pressurization capacity of the corresponding high-pressure oil pump exceeds a first preset threshold value, which is considered as a main factor influencing the pressurization capacity of the high-pressure oil pump, when the change in the supercharging capacity of the high-pressure oil pump does not exceed the first preset threshold value but exceeds the second preset threshold value, the corresponding engine parameters are considered as secondary factors influencing the supercharging capacity of the high-pressure oil pump, when the change of the supercharging capacity of the high-pressure oil pump does not exceed a second preset threshold, and the influence on the supercharging capacity of the high-pressure oil filtering pump is considered to be too small by corresponding engine parameters, and is not considered. Then, a basic supercharging capacity is determined based on the primary factor, and a compensation coefficient for the supercharging capacity of the high-pressure oil pump is determined based on the secondary factor.
According to n, p and corresponding mapping table, the mapping table is searched to determine the basic boost capacity pct under the working condition0Determining a first compensation coefficient k of the pressurization capacity of the high-pressure oil pump according to T and a corresponding mapping table1The higher the temperature, k1The smaller the difference, the second compensation coefficient k of the pressurization capacity of the high-pressure oil pump is determined according to the U and a corresponding mapping table2The higher the battery voltage, k2The smaller. According to pct0、k1And k2Calculating pct, pct ═ pct0*k1*k2。
Preferably, in a further embodiment of the present invention, before acquiring the operating state of the engine when the engine rail pressure sensor fails, the method further comprises the following steps:
acquiring the pressurization capacity of a first high-pressure oil pump under different n and p parameters at preset fuel temperature and preset vehicle storage battery voltage, and defining the pressurization capacity of the first high-pressure oil pump as pct0And establish n, p and pct0A corresponding mapping table;
obtaining a different pct at a preset vehicle battery voltage0And a second high-pressure oil pump pressure boost capability under T, according to the second high-pressure oil pump pressure boost capability and pct0Determining k1Establishing n, p, T and k1A corresponding mapping table;
obtaining different pct at preset fuel temperature0And the boosting capacity of a third high-pressure oil pump under the U is determined according to the boosting capacity of the third high-pressure oil pump and the pct0Determining k2Establishing n, p, U and k2A corresponding mapping table.
Specifically, in this embodiment, the first high-pressure oil pump pressurization capacity under different n and p parameters at the preset fuel temperature and the preset vehicle battery voltage is obtained, and the first high-pressure oil pump pressurization capacity is defined as pct0And establish n, p and pct0A corresponding mapping table. The preset fuel temperature and the preset vehicle storage battery voltage are parameters which do not influence the supercharging capacity of the high-pressure oil pump. When any one of n and p is fixed, changing the parameter of another value to obtain the corresponding pct0According to n, p and pct0And establishing a corresponding mapping table. pct, p corresponds to pct0The mapping table of (1) is shown in table 1, and the content of table 1 is mainly for easy understanding, is an example under partial working conditions, and does not represent the whole content of the mapping table.
TABLE 1 basic boost Capacity pct0Mapping table of
Figure BDA0002508383820000091
Figure BDA0002508383820000101
Obtain under presetting vehicle battery voltage, should also predetermine vehicle battery voltage and can not exert an influence, different pct to high-pressure oil pump pressure boost ability promptly0And a second high pressure oil pump boost capability at T, according to the second high pressure oil pump boost capability and pct0Determining k1，k1Namely the influence factor of T on the supercharging capacity of the high-pressure oil pump according to pct0Corresponding n and p can be determined, thus establishing n, p, T, and k1A corresponding mapping table. pct0And any one value of T is constantChanging the parameter of another value to obtain the corresponding pct0According to n, p and k1And establishing a corresponding mapping table. n, p, T correspond to k1The content of table 2 is mainly for easy understanding, is an example under partial working conditions, and does not represent the whole content of the mapping table.
TABLE 2 first Compensation coefficient k1Mapping table of
Figure BDA0002508383820000102
Different pct that the preset fuel temperature does not affect the supercharging capacity of the high-pressure oil pump when the preset fuel temperature is obtained0And the boosting capacity of a third high-pressure oil pump under the U is determined according to the boosting capacity of the third high-pressure oil pump and the pct0Determining k2，k2Namely the influence factor of U on the supercharging capacity of the high-pressure oil pump according to pct0Corresponding n and p can be determined, thus establishing n, p, U, and k2A corresponding mapping table. pct0When any value in U is fixed, the parameter of another value is changed to obtain the corresponding pct0According to n, p and k2And establishing a corresponding mapping table. n, p, T correspond to k2The content of table 3 is mainly for easy understanding, is an example under partial working conditions, and does not represent the whole content of the mapping table.
TABLE 3 second Compensation coefficient k2Mapping table of
Figure BDA0002508383820000103
Figure BDA0002508383820000111
Another embodiment of the present invention provides a method for processing a fault after an engine rail pressure sensor is an optimized embodiment of the above embodiments, and after the working state of each cylinder is identified, the method further includes the following steps after analyzing the supercharging capacity pct of the high-pressure oil pump according to the engine speed n, the current target oil pressure p, the fuel temperature T, the vehicle battery voltage U and a corresponding mapping table:
controlling the oil injection pulse width according to p in the running process of the engine; adjusting the lowest idling speed of the engine to a preset speed; controlling an ignition angle and knocking by adopting the octane number of a preset oil product; adjusting the external characteristic torque of the engine to a preset threshold value; the fuel oil is corrected for a long time and is not activated by self learning; and the preset elements stop working, and the preset elements are relays and electromagnetic valve electric appliances influencing the air charging efficiency or the air-fuel ratio.
Specifically, in the present embodiment, as shown in fig. 3, when the engine rail pressure sensor fails, the operating state of the engine is acquired. If the engine speed is 0, the high-pressure oil pump is in a stop state, and no treatment is needed to be carried out on the working capacity of the high-pressure oil pump.
If the engine speed is not 0 and is in a starting state, but the engine is not synchronous, namely the engine is still in a cylinder detection state at present, the working state of each cylinder is identified, the preset time is not exceeded, and the high-pressure oil pump is used for supercharging by adopting the preset maximum supercharging capacity in the mapping table.
When the high-pressure oil pump is pressurized with the preset maximum pressurization capacity, in one case, after the high-pressure oil pump is pressurized with the preset maximum pressurization capacity for the preset time, the engine still does not completely recognize the working state of each cylinder, and therefore, the high-pressure oil pump stops the pressurization after the high-pressure oil pump is pressurized with the preset maximum pressurization capacity for the preset time.
The other condition is that when the high-pressure oil pump is not pressurized by adopting the preset maximum pressurization capacity for the preset time, the engine already identifies the working state of each cylinder, at the moment, the high-pressure oil pump does not adopt the preset maximum pressurization capacity for pressurization any more, but obtains the engine speed n, the current target oil pressure p, the fuel temperature T and the vehicle storage battery voltage U, analyzes the pressurization capacity pct of the high-pressure oil pump by combining with a corresponding mapping table, and performs pressurization according to the pct through the high-pressure oil pump.
Meanwhile, during the running process of the engine, the oil injection pulse width is controlled according to p instead of the actual oil rail pressure.
The lowest idling speed of the engine is adjusted to the preset speed, the lowest idling speed of the engine is improved, robustness resistance and interference resistance are improved, and the engine is guaranteed not to be flameout.
And controlling an ignition angle and knocking by adopting a preset octane number of the oil product, wherein the octane number of the oil product is the octane number level of the worst oil product, and the octane number level of the oil product is not learned. The octane number of good oil products is more aggressive, the octane number of the worst oil products is more conservative, and the engine is ensured not to be flamed out.
The fuel oil long-term correction self-learning is not activated, because the engine oil rail pressure sensor is in failure, a plurality of parameters do not accord with the actual situation, and the corresponding current processing measures do not have subsequent reference significance, so the self-learning is not needed.
The preset elements stop working, and the preset elements are relays and electromagnetic valve electric appliances which influence the air charging efficiency or the air-fuel ratio, for example, the carbon tank is controlled to be inactivated; EGR control is not active; the VVT control is not activated. Namely, all relays and electromagnetic valve electric loads which affect the air charging efficiency or the air-fuel ratio do not work.
The engine-out characteristic torque is adjusted to a preset threshold, for example, the engine-out characteristic torque is reduced to 60% of the original engine-out characteristic torque. The maximum torque under any working condition under the condition that the external characteristic torque of the engine is hundred percent of the accelerator.
This application when any trouble appears in oil rail pressure sensor, engine fuel oil pressure control still can be with higher safe oil pressure control, and through the reasonable cooperation of other controls of engine, and avoid the engine to stall, guarantee vehicle power take off as far as possible, guarantee that the driver can drive the vehicle to the maintenance shop and maintain, guarantee vehicle personal safety and vehicle life simultaneously.
Referring to FIG. 4, an embodiment of the present invention provides an engine rail pressure sensor failure aftertreatment system 100, comprising:
a state acquisition module 110 configured to: when the oil rail pressure sensor fails, acquiring the working state of the engine;
an oil pump pressurization module 120 connected to the status acquisition module 110 for: when the working state shows that the engine is in a starting state and the working state of each cylinder is not identified, adopting the maximum supercharging capacity preset in the supercharging capacity mapping table to carry out supercharging;
the oil pump pressurization module 120 is further configured to: after the preset time, stopping pressurizing; or the like, or, alternatively,
a boost capability analysis module 130, connected to the oil pump boost module 120, for: after the working state of each cylinder is identified, analyzing the supercharging capacity pct of the high-pressure oil pump according to the engine speed n, the current target oil pressure p, the fuel temperature T, the vehicle storage battery voltage U and a corresponding mapping table;
the oil pump pressurization module 120 is connected to the state obtaining module 110, and is further configured to: the boost was performed as per pct.
The supercharging capability analysis module 130 specifically includes:
a basic capability determining unit 131 configured to: determining a basic boost capability pct according to n, p and corresponding mapping tables0；
A coefficient determination unit 132 for: determining a first compensation coefficient k of the pressurization capacity of the high-pressure oil pump according to T and a corresponding mapping table1(ii) a Determining a second compensation coefficient k of the pressurization capacity of the high-pressure oil pump according to the U and a corresponding mapping table2；
A calculating unit 133, connected to the basic capability determining unit 131 and the coefficient determining unit 132, for: according to pct0、k1And k2And calculating the pct.
Further comprising:
a data acquisition module 140 connected to the oil pump pressurization module 120 for: and acquiring a pressurization capacity mapping table corresponding to the parameters of the high-pressure oil pump and the pressurization capacity of the high-pressure oil pump.
The data obtaining module 140, connected to the supercharging capability analysis module 130, is further configured to: acquiring the pressurization capacity of a first high-pressure oil pump under different n and p parameters at preset fuel temperature and preset vehicle storage battery voltage, and defining the pressurization capacity of the first high-pressure oil pump as pct0And establishn, p and pct0A corresponding mapping table; obtaining a different pct at a preset vehicle battery voltage0And a second high-pressure oil pump pressure boost capability under T, according to the second high-pressure oil pump pressure boost capability and pct0Determining k1Establishing n, p, T and k1A corresponding mapping table; obtaining different pct at preset fuel temperature0And the boosting capacity of a third high-pressure oil pump under the U is determined according to the boosting capacity of the third high-pressure oil pump and the pct0Determining k2Establishing n, p, U and k2A corresponding mapping table.
A control module 150 coupled to the oil pump pressurization module 120 for: controlling the oil injection pulse width according to p in the running process of the engine; adjusting the lowest idling speed of the engine to a preset speed; controlling an ignition angle and knocking by adopting the octane number of a preset oil product; adjusting the external characteristic torque of the engine to a preset threshold value; the fuel oil is corrected for a long time and is not activated by self learning; and the preset elements stop working, and the preset elements are relays and electromagnetic valve electric appliances influencing the air charging efficiency or the air-fuel ratio.
Specifically, the functions of the modules in this embodiment have been elaborated in the corresponding method embodiments, and therefore a description thereof is not repeated.
It will be apparent to those skilled in the art that various changes and modifications may be made in the present invention without departing from the spirit and scope of the invention. Thus, if such modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include such modifications and variations.

Claims (8)

1. A fault post-processing method for an engine oil rail pressure sensor is characterized by comprising the following steps:
when an engine oil rail pressure sensor fails, acquiring the working state of an engine;
when the working state shows that the engine is in a starting state and the working state of each cylinder is not identified, carrying out pressurization by adopting the maximum pressurization capacity preset in the pressurization capacity mapping table through the high-pressure oil pump;
after the preset time, the high-pressure oil pump stops supercharging; or the like, or, alternatively,
after the working state of each cylinder is identified, analyzing the supercharging capacity pct of the high-pressure oil pump according to the engine speed n, the current target oil pressure p, the fuel temperature T, the vehicle storage battery voltage U and a corresponding mapping table; the method specifically comprises the following steps: determining a basic boost capability pct according to n, p and corresponding mapping tables0(ii) a Determining a first compensation coefficient k of the pressurization capacity of the high-pressure oil pump according to T and a corresponding mapping table1(ii) a Determining a second compensation coefficient k of the pressurization capacity of the high-pressure oil pump according to the U and a corresponding mapping table2(ii) a According to pct0、k1And k2Calculating pct;
pressurization is performed by a high-pressure oil pump according to pct.
2. The method for processing the fault after the oil rail pressure sensor is failed according to claim 1, wherein when the oil rail pressure sensor of the engine is failed, before the working state of the engine is acquired, the method further comprises the following steps:
and acquiring a pressurization capacity mapping table corresponding to the parameters of the high-pressure oil pump and the pressurization capacity of the high-pressure oil pump.
3. The method for processing the fault after the oil rail pressure sensor is out of order according to claim 1, wherein when the oil rail pressure sensor is out of order and before the working state of the engine is acquired, the method further comprises the following steps:
acquiring the pressurization capacity of a first high-pressure oil pump under different n and p parameters at preset fuel temperature and preset vehicle storage battery voltage, and defining the pressurization capacity of the first high-pressure oil pump as pct0And establish n, p and pct0A corresponding mapping table;
obtaining a different pct at a preset vehicle battery voltage0And a second high-pressure oil pump pressure boost capability under T, according to the second high-pressure oil pump pressure boost capability and pct0Determining k1Establishing n, p, T and k1A corresponding mapping table;
obtaining different pct at preset fuel temperature0And third under UThe supercharging capacity of the high-pressure oil pump is determined according to the supercharging capacity of the third high-pressure oil pump and the pct0Determining k2Establishing n, p, U and k2A corresponding mapping table.
4. The method for processing fault after the oil rail pressure sensor according to claim 1, wherein after the working state of each cylinder is identified, the method further comprises the following steps after analyzing the high-pressure oil pump supercharging capacity pct according to the engine speed n, the current target oil pressure p, the fuel temperature T, the vehicle battery voltage U and a corresponding mapping table:
controlling the oil injection pulse width according to p in the running process of the engine; adjusting the lowest idling speed of the engine to a preset speed; controlling an ignition angle and knocking by adopting the octane number of a preset oil product; adjusting the external characteristic torque of the engine to a preset threshold value; the fuel oil is corrected for a long time and is not activated by self learning; and the preset elements stop working, and the preset elements are relays and electromagnetic valve electric appliances influencing the air charging efficiency or the air-fuel ratio.
5. A system for processing a fault after an oil rail pressure sensor is failed, comprising:
a state acquisition module to: when the oil rail pressure sensor fails, acquiring the working state of the engine;
an oil pump pressurization module connected with the state acquisition module for: when the working state shows that the engine is in a starting state and the working state of each cylinder is not identified, adopting the maximum supercharging capacity preset in the supercharging capacity mapping table to carry out supercharging;
the oil pump pressurization module is further configured to: after the preset time, stopping pressurizing; or the like, or, alternatively,
a boost capability analysis module connected with the oil pump boost module for: after the working state of each cylinder is identified, analyzing the supercharging capacity pct of the high-pressure oil pump according to the engine speed n, the current target oil pressure p, the fuel temperature T, the vehicle storage battery voltage U and a corresponding mapping table; the supercharging capacity analysis module specifically comprises:
a basic capability determining unit for: determining a basic boost capability pct according to n, p and corresponding mapping tables0；
A coefficient determination unit for: determining a first compensation coefficient k of the pressurization capacity of the high-pressure oil pump according to T and a corresponding mapping table1(ii) a Determining a second compensation coefficient k of the pressurization capacity of the high-pressure oil pump according to the U and a corresponding mapping table2；
A calculating unit, connected to the basic capability determining unit and the coefficient determining unit, for: according to pct0、k1And k2Calculating pct;
the oil pump pressurization module is further used for: the boost was performed as per pct.
6. The rail pressure sensor fault post-processing system of claim 5, further comprising:
the data acquisition module is connected with the oil pump pressurization module and used for: and acquiring a pressurization capacity mapping table corresponding to the parameters of the high-pressure oil pump and the pressurization capacity of the high-pressure oil pump.
7. The rail pressure sensor fault post-processing system of claim 6, further comprising:
the data acquisition module is connected with the supercharging capacity analysis module and is further used for: acquiring the pressurization capacity of a first high-pressure oil pump under different n and p parameters at preset fuel temperature and preset vehicle storage battery voltage, and defining the pressurization capacity of the first high-pressure oil pump as pct0And establish n, p and pct0A corresponding mapping table; obtaining a different pct at a preset vehicle battery voltage0And a second high-pressure oil pump pressure boost capability under T, according to the second high-pressure oil pump pressure boost capability and pct0Determining k1Establishing n, p, T and k1A corresponding mapping table; obtaining different pct at preset fuel temperature0And the boosting capacity of a third high-pressure oil pump under the U is determined according to the boosting capacity of the third high-pressure oil pump and the pct0Determining k2Establishing n, p, U and k2A corresponding mapping table.
8. The rail pressure sensor fault post-processing system of claim 5, further comprising:
a control module connected to the oil pump pressurization module for: controlling the oil injection pulse width according to p in the running process of the engine; adjusting the lowest idling speed of the engine to a preset speed; controlling an ignition angle and knocking by adopting the octane number of a preset oil product; adjusting the external characteristic torque of the engine to a preset threshold value; the fuel oil is corrected for a long time and is not activated by self learning; and the preset elements stop working, and the preset elements are relays and electromagnetic valve electric appliances influencing the air charging efficiency or the air-fuel ratio.
CN202010453387.1A 2020-05-26 2020-05-26 Method and system for post-processing fault of engine oil rail pressure sensor Active CN111720231B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202010453387.1A CN111720231B (en) 2020-05-26 2020-05-26 Method and system for post-processing fault of engine oil rail pressure sensor

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202010453387.1A CN111720231B (en) 2020-05-26 2020-05-26 Method and system for post-processing fault of engine oil rail pressure sensor

Publications (2)

Publication Number Publication Date
CN111720231A CN111720231A (en) 2020-09-29
CN111720231B true CN111720231B (en) 2021-07-23

Family

ID=72565069

Family Applications (1)

Application Number Title Priority Date Filing Date
CN202010453387.1A Active CN111720231B (en) 2020-05-26 2020-05-26 Method and system for post-processing fault of engine oil rail pressure sensor

Country Status (1)

Country Link
CN (1) CN111720231B (en)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN115450778B (en) * 2022-09-14 2024-01-09 一汽解放汽车有限公司 Oil supply control method and device, electronic equipment and storage medium

Citations (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2002047984A (en) * 2000-07-28 2002-02-15 Denso Corp Abnormality diagnostic device for high pressure fuel supply system of internal combustion engine
CN1403697A (en) * 2001-08-31 2003-03-19 株式会社电装 Accumulator fuel injection system for ensuring engine starting
KR20090065288A (en) * 2007-12-17 2009-06-22 현대자동차주식회사 A diagnosing method of air fuel ration imbalance cylinder
JP2011064127A (en) * 2009-09-17 2011-03-31 Hitachi Automotive Systems Ltd Drive control device for fuel pump
CN102037229A (en) * 2008-05-23 2011-04-27 欧陆汽车有限责任公司 Method for identifying an error function and in particular a drift of a rail pressure sensor in a common rail injection system
JP2011102565A (en) * 2009-11-11 2011-05-26 Denso Corp Apparatus for diagnosing abnormal part
JP2013064378A (en) * 2011-09-20 2013-04-11 Hitachi Automotive Systems Ltd Fuel feed control device for internal combustion engine
JP2014173460A (en) * 2013-03-07 2014-09-22 Bosch Corp Reducing agent supply device
CN107864661A (en) * 2015-05-21 2018-03-30 Mtu 腓特烈港有限责任公司 Spraying system for internal combustion engine and the internal combustion engine with this spraying system
CN111140390A (en) * 2018-11-06 2020-05-12 长城汽车股份有限公司 Control method and device for vehicle fuel system

Patent Citations (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2002047984A (en) * 2000-07-28 2002-02-15 Denso Corp Abnormality diagnostic device for high pressure fuel supply system of internal combustion engine
CN1403697A (en) * 2001-08-31 2003-03-19 株式会社电装 Accumulator fuel injection system for ensuring engine starting
KR20090065288A (en) * 2007-12-17 2009-06-22 현대자동차주식회사 A diagnosing method of air fuel ration imbalance cylinder
CN102037229A (en) * 2008-05-23 2011-04-27 欧陆汽车有限责任公司 Method for identifying an error function and in particular a drift of a rail pressure sensor in a common rail injection system
JP2011064127A (en) * 2009-09-17 2011-03-31 Hitachi Automotive Systems Ltd Drive control device for fuel pump
JP2011102565A (en) * 2009-11-11 2011-05-26 Denso Corp Apparatus for diagnosing abnormal part
JP2013064378A (en) * 2011-09-20 2013-04-11 Hitachi Automotive Systems Ltd Fuel feed control device for internal combustion engine
JP2014173460A (en) * 2013-03-07 2014-09-22 Bosch Corp Reducing agent supply device
CN107864661A (en) * 2015-05-21 2018-03-30 Mtu 腓特烈港有限责任公司 Spraying system for internal combustion engine and the internal combustion engine with this spraying system
CN111140390A (en) * 2018-11-06 2020-05-12 长城汽车股份有限公司 Control method and device for vehicle fuel system

Also Published As

Publication number Publication date
CN111720231A (en) 2020-09-29

Similar Documents

Publication Publication Date Title
RU2706853C2 (en) Method (embodiments) and fuel system control system
JP4661930B2 (en) Fuel supply device for internal combustion engine
CN106704012B (en) Methanol-Diesel Dual-Fuel Engine control system and method
US8762030B2 (en) Fuel supply control device for internal combustion engine and fuel vapor processing method
US7124740B2 (en) Fuel injection control device for internal combustion engine
US10458310B2 (en) Control device for internal combustion engine
JP4659648B2 (en) Abnormality judgment device for fuel supply system
US20130000752A1 (en) Shut-off valve fault diagnosis device and fuel supply system
JP4386026B2 (en) Fuel injection control device
EP2930339A2 (en) Engine rotational speed control apparatus
US20100168983A1 (en) Internal combustion engine, control system and operating method for determining a fuel attribute
JP5056729B2 (en) Fuel supply device for internal combustion engine
EP2549091A1 (en) Shut-off valve fault diagnosis device
DE102016111008A1 (en) Fuel injection control device
CN111720231B (en) Method and system for post-processing fault of engine oil rail pressure sensor
CN111720228A (en) Exhaust temperature monitoring and correcting method and system for cylinders of engine
DE102010060872B4 (en) Control device for a diesel engine
JP2013253560A (en) Fuel supply device
JP3846381B2 (en) Abnormality diagnosis device for exhaust gas recirculation system
CN112253322B (en) Engine control method based on oil rail pressure sensor fault
WO2013161008A1 (en) Control device for internal combustion engine
EP3153688A1 (en) Engine control device and engine
JP2009221906A (en) Low pressure pump control device of direct injection type internal combustion engine
KR101961957B1 (en) Equipment and method for controlling diesel engine according to bio-diesel content
JP2008190394A (en) Pressure sensor, and pressure control device

Legal Events

Date Code Title Description
PB01 Publication
PB01 Publication
SE01 Entry into force of request for substantive examination
SE01 Entry into force of request for substantive examination
GR01 Patent grant
GR01 Patent grant