CN114542310B - Method, device, system and medium for judging reason of excessive rail pressure of engine - Google Patents

Method, device, system and medium for judging reason of excessive rail pressure of engine Download PDF

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Publication number
CN114542310B
CN114542310B CN202210189464.6A CN202210189464A CN114542310B CN 114542310 B CN114542310 B CN 114542310B CN 202210189464 A CN202210189464 A CN 202210189464A CN 114542310 B CN114542310 B CN 114542310B
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engine
rail pressure
preset threshold
threshold value
metering unit
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CN114542310A (en
Inventor
宋增凤
徐永新
华典
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Weichai Power Co Ltd
Weifang Weichai Power Technology Co Ltd
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Weichai Power Co Ltd
Weifang Weichai Power Technology Co Ltd
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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
    • F02D41/00—Electrical control of supply of combustible mixture or its constituents
    • F02D41/22—Safety or indicating devices for abnormal conditions
    • 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
    • F02D41/22—Safety or indicating devices for abnormal conditions
    • F02D2041/224—Diagnosis of the fuel system
    • 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
    • F02D41/22—Safety or indicating devices for abnormal conditions
    • F02D2041/228—Warning displays
    • 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
    • F02D2250/31—Control of the fuel pressure
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00—Road transport of goods or passengers
    • Y02T10/10—Internal combustion engine [ICE] based vehicles
    • Y02T10/40—Engine management systems

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Combined Controls Of Internal Combustion Engines (AREA)
  • Fuel-Injection Apparatus (AREA)
  • Electrical Control Of Air Or Fuel Supplied To Internal-Combustion Engine (AREA)

Abstract

The application provides a method, a device, a system and a medium for judging the reason of excessive rail pressure of an engine, wherein the method comprises the following steps: when the difference value between the current rail pressure actual value of the engine and the rail pressure set value of the engine is larger than a first preset threshold value, controlling the opening of the oil metering unit of the fuel system to be reduced by a second preset threshold value, and when the difference value between the current rail pressure actual value and the rail pressure set value of the engine is larger than the first preset threshold value after controlling the opening of the oil metering unit of the fuel system to be reduced by the second preset threshold value, judging that the rail pressure of the engine is too high due to high return oil pressure of the fuel system. Therefore, whether the rail pressure of the engine is too high or not due to the too high oil return pressure can be automatically identified by adjusting the opening degree of the oil metering unit, the test personnel can be helped to quickly and accurately locate the problem reasons, the efficiency is improved, and the use experience of users is enhanced.

Description

Method, device, system and medium for judging reason of excessive rail pressure of engine
Technical Field
The application relates to the technical field of engines, in particular to a method, a device, a system and a medium for judging reasons of overhigh rail pressure of an engine.
Background
The oil return pressure of the engine fuel system needs to meet preset requirements, if the oil return pressure is too high, the excessive fuel pressure in an engine oil supply rail can be caused, namely, faults such as too high rail pressure or flushing of a pressure limiting valve and the like, and faults such as insufficient torque limiting power of the engine are caused, namely, limited power of the torque output of the engine is insufficient, but at present, when the problem of too high actual rail pressure occurs, the problem cause cannot be timely and accurately identified.
Disclosure of Invention
In view of the foregoing, it is an object of the present application to provide a method, apparatus, system and medium for determining the cause of an engine rail pressure excess,
in order to achieve the above purpose, the present application has the following technical scheme:
in a first aspect, an embodiment of the present application provides a method for determining a cause of an excessive rail pressure of an engine, including:
when the difference value between the current rail pressure actual value of the engine and the rail pressure set value of the engine is larger than a first preset threshold value, controlling the opening of an oil quantity metering unit of the fuel system to be reduced by a second preset threshold value;
and when the difference value between the current rail pressure actual value and the rail pressure set value of the engine is larger than a first preset threshold value after the opening degree of the oil metering unit for controlling the fuel system is reduced by a second preset threshold value, judging that the rail pressure of the engine is too high due to high oil return pressure of the fuel system.
In one possible implementation manner, the reducing the opening of the fuel metering unit of the control fuel system by a second preset threshold value includes:
and adjusting the duty ratio of the oil quantity metering unit to reduce the opening degree of the oil quantity metering unit by a second preset threshold value.
In one possible implementation, the method further includes:
before the opening degree of the oil metering unit of the control fuel system is reduced by a second preset threshold value, controlling the engine to be in a steady-state working condition, wherein the rotating speed of the engine is smaller than or equal to a third preset threshold value, the load change of the engine is smaller than or equal to a fourth preset threshold value, and the oil metering unit has no electrical fault.
In one possible implementation, after the determining that the rail pressure of the engine is too high due to the high return pressure of the fuel system, the method further includes:
and a fault warning is given so that technicians can adjust the oil return pressure.
In a second aspect, an embodiment of the present application further provides a device for determining a cause of an excessive rail pressure of an engine, including:
the control unit is used for controlling the opening degree of the oil quantity metering unit of the fuel system to be reduced by a second preset threshold value when the difference value between the current rail pressure actual value of the engine and the rail pressure set value of the engine is larger than the first preset threshold value;
and the judging unit is used for judging that the rail pressure of the engine is too high due to the high return pressure of the fuel system when the difference value between the actual value of the current rail pressure and the rail pressure set value of the engine is larger than the first preset threshold value after the opening degree of the fuel metering unit for controlling the fuel system is reduced by a second preset threshold value.
In one possible implementation, the control unit includes:
and the adjusting unit is used for adjusting the duty ratio of the oil quantity metering unit so as to reduce the opening degree of the oil quantity metering unit by a second preset threshold value.
In one possible implementation, the apparatus further includes:
and the engine condition control unit is used for controlling the engine to be in a steady-state working condition before the opening degree of the oil metering unit for controlling the fuel system is reduced by a second preset threshold value, the rotating speed of the engine is smaller than or equal to a third preset threshold value, the load change of the engine is smaller than or equal to a fourth preset threshold value, and the oil metering unit has no electrical fault.
In one possible implementation, the apparatus further includes:
and the fault alarm unit is used for reporting a fault prompt so that technicians can adjust the oil return pressure.
In a third aspect, an embodiment of the present application further provides a system for determining a cause of an excessive rail pressure of an engine, including:
a memory for storing a computer program;
and a processor for implementing the steps of the method of determining the cause of the engine rail pressure being too high as described above when executing the computer program.
In a fourth aspect, embodiments of the present application further provide a computer readable storage medium having a computer program stored thereon, which when processed and executed implements the steps of the method of determining a cause of engine rail overpressure as described above.
Drawings
In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described, and it is obvious that the drawings in the following description are some embodiments of the present application, and other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 illustrates a flow chart of a method for determining a cause of an engine rail pressure excess provided by an embodiment of the present application;
fig. 2 shows a schematic diagram of a device for determining a cause of an excessive rail pressure of an engine according to an embodiment of the present application.
Detailed Description
In order to make the above objects, features and advantages of the present application more comprehensible, embodiments accompanied with figures are described in detail below.
In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present application, but the present application may be practiced in other ways other than those described herein, and persons skilled in the art will readily appreciate that the present application is not limited to the specific embodiments disclosed below.
As described in the background art, the oil return pressure of the fuel system of the engine needs to meet the preset requirement, if the oil return pressure is too high, the excessive fuel pressure in the fuel supply rail of the engine can be caused, that is, faults such as too high rail pressure or the flushing of the pressure limiting valve, and faults such as insufficient torque limiting power of the engine are caused, that is, the power of the torque output of the engine is limited is insufficient, but at present, when the problem of too high actual rail pressure occurs, the problem cause cannot be accurately identified in time.
In order to solve the above technical problems, embodiments of the present application provide a method, an apparatus, a system, and a medium for determining a cause of an excessive rail pressure of an engine, where the method includes: when the difference value between the current rail pressure actual value of the engine and the rail pressure set value of the engine is larger than a first preset threshold value, controlling the opening of the oil metering unit of the fuel system to be reduced by a second preset threshold value, and when the difference value between the current rail pressure actual value and the rail pressure set value of the engine is larger than the first preset threshold value after controlling the opening of the oil metering unit of the fuel system to be reduced by the second preset threshold value, judging that the rail pressure of the engine is too high due to high return oil pressure of the fuel system. Therefore, whether the rail pressure of the engine is too high or not due to the too high oil return pressure can be automatically identified by adjusting the opening degree of the oil metering unit, the test personnel can be helped to quickly and accurately locate the problem reasons, the efficiency is improved, and the use experience of users is enhanced.
Exemplary method
Referring to fig. 1, the flowchart of a method for determining a cause of excessive rail pressure of an engine according to an embodiment of the present application includes:
s101: and when the difference value between the current rail pressure actual value of the engine and the rail pressure set value of the engine is larger than a first preset threshold value, controlling the opening of the oil metering unit of the fuel system to be reduced by a second preset threshold value.
In the embodiment of the application, in the normal working process of the engine, the actual value of the rail pressure changes along with the set value of the rail pressure, and if the deviation is too large, the working stability of the engine can be influenced, so that the actual value of the current rail pressure of the engine and the set value of the current rail pressure can be judged in real time.
When the difference value between the current rail pressure actual value of the engine and the rail pressure set value of the engine is larger than a first preset threshold value, controlling the opening of an oil metering unit of the fuel system to be reduced by a second preset threshold value, and observing the actual rail pressure value.
And whether the opening degree of the oil quantity metering unit of the fuel system is adjusted can be judged by observing whether the actual rail pressure value is reduced or not.
It should be noted that, the magnitude of the second preset threshold may be set by a person skilled in the art according to the actual situation, and the embodiment of the present application is not specifically limited herein.
S102: and when the difference value between the current rail pressure actual value and the rail pressure set value of the engine is larger than a first preset threshold value after the opening degree of the oil metering unit for controlling the fuel system is reduced by a second preset threshold value, judging that the rail pressure of the engine is too high due to high oil return pressure of the fuel system.
In this embodiment of the present application, after the opening of the fuel metering unit that controls the fuel system is reduced by the second preset threshold, it may be continuously determined whether the difference between the current rail pressure actual value and the rail pressure set value of the engine is greater than the first preset threshold, and when the difference between the current rail pressure actual value and the rail pressure set value of the engine is greater than the first preset threshold, it is determined that the opening reduction does not play a role, and it is considered that the rail pressure caused by the high return pressure of the fuel system is high, that is, it is determined that the rail pressure of the engine caused by the high return pressure of the fuel system is too high.
In one possible implementation, the opening degree of the fuel metering unit of the fuel system is controlled to be reduced by a second preset threshold value, which can be controlled to be reduced by:
the duty ratio of the oil amount metering unit is adjusted so that the opening degree of the oil amount metering unit is reduced by a second preset threshold value, and the duty ratio of the oil amount metering unit refers to the proportion of the energization time relative to the total time in one pulse cycle.
It should be noted that, the magnitude of the first preset threshold may be set by a person skilled in the art according to the actual situation, and the embodiment of the present application is not specifically limited herein.
In one possible implementation manner, the method provided by the embodiment of the application further includes:
before the opening degree of the oil metering unit of the fuel oil system is controlled to be reduced by a second preset threshold value, the engine is controlled to be in a steady-state working condition, the rotating speed of the engine is smaller than or equal to a third preset threshold value, the load change of the engine is smaller than or equal to a fourth preset threshold value, and the oil metering unit has no electrical fault, namely, the precondition of the judging method provided by the embodiment of the application is that the engine is in the steady-state working condition, so that the judging accuracy is improved, and the occurrence of erroneous judgment is avoided.
The magnitudes of the second preset threshold and the third preset threshold may be set by those skilled in the art according to actual situations, and the embodiments of the present application are not specifically limited herein.
In addition, in the embodiment of the application, after the opening of the fuel metering unit for controlling the fuel system is reduced by the second preset threshold, the rail pressure actual value is correspondingly reduced, if the difference between the rail pressure actual value and the rail pressure set value of the engine is smaller than the first preset threshold, it is indicated that the rail pressure is too high possibly caused by other reasons, and at the moment, an alarm can be given to inform an operation and maintenance personnel to further check other reasons.
The embodiment of the application provides a method for judging the reason of the excessive rail pressure of an engine, which comprises the following steps: when the difference value between the current rail pressure actual value of the engine and the rail pressure set value of the engine is larger than a first preset threshold value, controlling the opening of the oil metering unit of the fuel system to be reduced by a second preset threshold value, and when the difference value between the current rail pressure actual value and the rail pressure set value of the engine is larger than the first preset threshold value after controlling the opening of the oil metering unit of the fuel system to be reduced by the second preset threshold value, judging that the rail pressure of the engine is too high due to high return oil pressure of the fuel system. Therefore, whether the rail pressure of the engine is too high or not due to the too high oil return pressure can be automatically identified by adjusting the opening degree of the oil metering unit, the test personnel can be helped to quickly and accurately locate the problem reasons, the efficiency is improved, and the use experience of users is enhanced.
Exemplary apparatus
Referring to fig. 2, a schematic diagram of a device for determining a cause of an excessive rail pressure of an engine according to an embodiment of the present application includes:
a control unit 201, configured to control the opening degree of the fuel metering unit of the fuel system to decrease by a second preset threshold value when the difference between the current rail pressure actual value of the engine and the rail pressure set value of the engine is greater than the first preset threshold value;
and the judging unit 202 is configured to judge that the rail pressure of the engine is too high due to the high return pressure of the fuel system when the difference between the current rail pressure actual value and the rail pressure set value of the engine is greater than the first preset threshold after the opening of the fuel metering unit for controlling the fuel system is reduced by the second preset threshold.
In one possible implementation, the control unit includes:
and the adjusting unit is used for adjusting the duty ratio of the oil quantity metering unit so as to reduce the opening degree of the oil quantity metering unit by a second preset threshold value.
In one possible implementation, the apparatus further includes:
and the engine condition control unit is used for controlling the engine to be in a steady-state working condition before the opening degree of the oil metering unit for controlling the fuel system is reduced by a second preset threshold value, the rotating speed of the engine is smaller than or equal to a third preset threshold value, the load change of the engine is smaller than or equal to a fourth preset threshold value, and the oil metering unit has no electrical fault.
In one possible implementation, the apparatus further includes:
and the fault alarm unit is used for reporting a fault prompt so that technicians can adjust the oil return pressure.
The embodiment of the application provides a device for judging the reason of overhigh rail pressure of an engine, and a method for utilizing the device comprises the following steps: when the difference value between the current rail pressure actual value of the engine and the rail pressure set value of the engine is larger than a first preset threshold value, controlling the opening of the oil metering unit of the fuel system to be reduced by a second preset threshold value, and when the difference value between the current rail pressure actual value and the rail pressure set value of the engine is larger than the first preset threshold value after controlling the opening of the oil metering unit of the fuel system to be reduced by the second preset threshold value, judging that the rail pressure of the engine is too high due to high return oil pressure of the fuel system. Therefore, whether the rail pressure of the engine is too high or not due to the too high oil return pressure can be automatically identified by adjusting the opening degree of the oil metering unit, the test personnel can be helped to quickly and accurately locate the problem reasons, the efficiency is improved, and the use experience of users is enhanced.
Based on the above embodiment, the embodiment of the present application further provides a system for determining a cause of an excessive rail pressure of an engine, including:
a memory for storing a computer program;
and a processor for implementing the steps of the method for judging the reason of the excessive rail pressure of the engine when executing the computer program.
On the basis of the above embodiments, the embodiments of the present application further provide a computer readable storage medium, on which a computer program is stored, which when processed and executed implements the steps of the method for determining the cause of the rail pressure of the engine as described above.
The computer readable storage medium may include: a U-disk, a removable hard disk, a Read-Only Memory (ROM), a random access Memory (Random Access Memory, RAM), a magnetic disk, or an optical disk, or other various media capable of storing program codes.
In this specification, each embodiment is described in a progressive manner, and identical and similar parts of each embodiment are all referred to each other, and each embodiment mainly describes differences from other embodiments. In particular, for device embodiments, since they are substantially similar to method embodiments, the description is relatively simple, as relevant to see the section of the method embodiments.
The foregoing is merely a preferred embodiment of the present application, and although the present application has been disclosed in the preferred embodiment, it is not intended to limit the present application. Any person skilled in the art may make many possible variations and modifications to the technical solution of the present application, or modify equivalent embodiments, using the methods and technical contents disclosed above, without departing from the scope of the technical solution of the present application. Therefore, any simple modification, equivalent variation and modification of the above embodiments according to the technical substance of the present application, which do not depart from the content of the technical solution of the present application, still fall within the scope of the technical solution of the present application.

Claims (8)

1. A method of determining a cause of an engine rail pressure excess comprising:
when the difference value between the current rail pressure actual value of the engine and the rail pressure set value of the engine is larger than a first preset threshold value, controlling the opening of an oil quantity metering unit of the fuel system to be reduced by a second preset threshold value;
before the opening degree of an oil mass metering unit of the control fuel system is reduced by a second preset threshold value, controlling the engine to be in a steady-state working condition, wherein the rotating speed of the engine is smaller than or equal to a third preset threshold value, the load change of the engine is smaller than or equal to a fourth preset threshold value, and the oil mass metering unit has no electrical fault;
and when the difference value between the current rail pressure actual value and the rail pressure set value of the engine is larger than a first preset threshold value after the opening degree of the oil metering unit for controlling the fuel system is reduced by a second preset threshold value, judging that the rail pressure of the engine is too high due to high oil return pressure of the fuel system.
2. The method of claim 1, wherein the reducing the opening of the fuel metering unit of the control fuel system by a second preset threshold comprises:
and adjusting the duty ratio of the oil quantity metering unit to reduce the opening degree of the oil quantity metering unit by a second preset threshold value.
3. The method of claim 1, wherein when said determining that said fuel system return pressure is high results in said engine rail pressure being too high, said method further comprises:
and a fault warning is given so that technicians can adjust the oil return pressure.
4. An apparatus for determining a cause of an excessive rail pressure in an engine, comprising:
the control unit is used for controlling the opening degree of the oil quantity metering unit of the fuel system to be reduced by a second preset threshold value when the difference value between the current rail pressure actual value of the engine and the rail pressure set value of the engine is larger than the first preset threshold value;
the engine condition control unit is used for controlling the engine to be in a steady-state working condition before the opening degree of the oil metering unit for controlling the fuel system is reduced by a second preset threshold value, the rotating speed of the engine is smaller than or equal to a third preset threshold value, the load change of the engine is smaller than or equal to a fourth preset threshold value, and the oil metering unit has no electrical fault;
and the judging unit is used for judging that the rail pressure of the engine is too high due to the high return pressure of the fuel system when the difference value between the actual value of the current rail pressure and the rail pressure set value of the engine is larger than the first preset threshold value after the opening degree of the fuel metering unit for controlling the fuel system is reduced by a second preset threshold value.
5. The apparatus of claim 4, wherein the control unit comprises:
and the adjusting unit is used for adjusting the duty ratio of the oil quantity metering unit so as to reduce the opening degree of the oil quantity metering unit by a second preset threshold value.
6. The apparatus of claim 4, wherein the apparatus further comprises:
and the fault alarm unit is used for reporting a fault prompt so that technicians can adjust the oil return pressure.
7. A system for determining a cause of an engine rail pressure excess comprising:
a memory for storing a computer program;
a processor for implementing the steps of the method of determining a cause of an engine rail pressure excess according to any one of claims 1-3 when executing said computer program.
8. A computer readable storage medium, characterized in that it has stored thereon a computer program which, when processed and executed, implements the steps of the method of determining the cause of an engine rail overpressure according to any one of claims 1-3.
CN202210189464.6A 2022-02-28 2022-02-28 Method, device, system and medium for judging reason of excessive rail pressure of engine Active CN114542310B (en)

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IT1321068B1 (en) * 2000-11-14 2003-12-30 Fiat Ricerche METHOD OF DIAGNOSIS OF LOSSES IN A COMMON MANIFOLD INJECTION SYSTEM OF AN INTERNAL COMBUSTION ENGINE.
JP4424128B2 (en) * 2004-09-10 2010-03-03 株式会社デンソー Common rail fuel injection system
DE102008024545A1 (en) * 2008-05-21 2009-11-26 Continental Automotive Gmbh Method for determining cause of defect in low pressure area of fuel injection system of internal combustion engine of motor vehicle, involves determining actual cause of defect by monitoring reaction of injection system to load step
DE102014204161A1 (en) * 2014-03-06 2015-09-10 Robert Bosch Gmbh Method for lowering a maximum pressure of at least one common rail injector
US9346451B2 (en) * 2014-04-04 2016-05-24 Ford Global Technologies, Llc Method and system for engine control

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