CN112360640B - Method, device and system for monitoring engine fire - Google Patents

Method, device and system for monitoring engine fire Download PDF

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Publication number
CN112360640B
CN112360640B CN202011105740.3A CN202011105740A CN112360640B CN 112360640 B CN112360640 B CN 112360640B CN 202011105740 A CN202011105740 A CN 202011105740A CN 112360640 B CN112360640 B CN 112360640B
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engine
cylinder
cylinder pressure
current
misfire
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CN112360640A (en
Inventor
魏涛
王凝露
翟长辉
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Weichai Power Co Ltd
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Weichai Power 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
    • F02D41/0002—Controlling intake air
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D2200/00—Input parameters for engine control
    • F02D2200/02—Input parameters for engine control the parameters being related to the engine
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D2200/00—Input parameters for engine control
    • F02D2200/02—Input parameters for engine control the parameters being related to the engine
    • F02D2200/10—Parameters related to the engine output, e.g. engine torque or engine speed
    • F02D2200/1002—Output torque
    • 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)

Abstract

The invention belongs to the technical field of vehicles, and particularly relates to a method, a device and a system for monitoring engine fire. The engine misfire monitoring method of the invention comprises the following steps: acquiring a current strain value on a main bearing cover, the rotating speed of an engine and the torque of the engine; the method comprises the steps of obtaining the current cylinder pressure of an air cylinder according to the current strain value on a main bearing cover, obtaining the cylinder pressure of the air cylinder under the specific working condition according to the rotating speed of an engine and the torque of the engine, and controlling an alarm to give an alarm and controlling the engine to enter a torque limiting mode according to the fact that the current cylinder pressure of the air cylinder is smaller than the cylinder pressure of the air cylinder under the specific working condition. According to the method for monitoring the engine fire, the engine is controlled to enter the torque limit and give an alarm through the current strain value of the main bearing, the fire can be monitored, the state of the engine can be corrected, the engine can be prevented from being out of work in other modes, and the normal operation of the engine can be guaranteed.

Description

Engine misfire monitoring method, device and system
Technical Field
The invention belongs to the technical field of vehicles, and particularly relates to a method, a device and a system for monitoring engine fire.
Background
The engine has the problem of misfire, the cylinder which is misfired by the engine loses normal work-doing capability due to the fact that fuel cannot be combusted normally, and other cylinders which are not misfired still do work normally, so that the engine misfire failure firstly can cause unstable operation of the engine. A cylinder misfire, which means a reduction in the number of cylinders (or cycles) involved in operation, naturally also affects the dynamic performance of the engine, which cannot operate properly. In which, a gas engine fire can also cause excess unburned gas to enter the aftertreatment system and cause abnormal chemical reactions in the aftertreatment system, burning the aftertreatment system.
In summary, the conventional engine has a misfire problem, and the engine cannot normally operate.
Disclosure of Invention
The invention aims to at least solve the problems of deviation of measured values and low temperature in the existing engine misfire monitoring method. The purpose is realized by the following technical scheme:
a first aspect of the present invention proposes a method of monitoring engine misfire, wherein the method comprises the steps of:
acquiring a current strain value on a main bearing cover, the rotating speed of an engine and the torque of the engine;
the method comprises the steps of obtaining the current cylinder pressure of a cylinder according to the current strain value on a main bearing cover, obtaining the cylinder pressure under the specific working condition of the cylinder according to the rotating speed of an engine and the torque of the engine, and controlling an alarm to give an alarm and controlling the engine to enter a torque limiting mode according to the fact that the current cylinder pressure of the cylinder is smaller than the cylinder pressure under the specific working condition of the cylinder.
According to the monitoring method for the engine fire, the current cylinder pressure of the cylinder is obtained according to the current strain value on the main bearing cover, the alarm is controlled to give an alarm and the engine is controlled to enter a torque limiting mode according to the fact that the current cylinder pressure of the cylinder is smaller than the cylinder pressure of the cylinder under the specific working condition, the engine is controlled to enter the torque limiting mode and give the alarm according to the current strain value of the main bearing, the engine fire can be monitored, the state of the engine can be corrected, the engine can be prevented from being out of work in other modes, and the normal operation of the engine can be guaranteed.
In addition, the method for monitoring engine misfire according to the present invention may also have the following additional technical features:
in some embodiments of the present invention, obtaining the cylinder pressure of the cylinder under the specific working condition according to the rotating speed of the engine and the torque of the engine comprises:
and accumulating the fire coefficient, wherein the accumulated fire coefficient exceeds the set fire coefficient, the alarm is controlled to give an alarm, and the engine is controlled to enter a torque limiting mode.
In some embodiments of the present invention, the accumulated misfire coefficients comprise:
the current cylinder pressure of the cylinder is smaller than the cylinder pressure under a first specific working condition, and a first misfire coefficient is accumulated; the cylinder pressure of the cylinder is smaller than the cylinder pressure under a second specific working condition, and a second fire coefficient is accumulated; and the cylinder pressure under the second specific working condition is smaller than that under the first specific working condition, and the second-time misfire coefficient is larger than the first-time misfire coefficient.
In some embodiments of the invention, the controlling the alarm to alarm and the engine to enter the torque limit mode comprises:
and controlling an alarm to alarm and controlling the throttle opening of the engine to be reduced.
In some embodiments of the invention, said obtaining a current cylinder pressure of the cylinder from the current strain value on the main bearing cap comprises:
and obtaining the current cylinder pressure of the cylinder according to the current strain value on the main bearing cover and a strain-cylinder pressure relation curve.
In some embodiments of the present invention, the obtaining the current cylinder pressure of the cylinder according to the current strain value on the main bearing cap further comprises:
and obtaining the current cylinder pressure of the cylinder according to the current strain value on the main bearing cover, wherein the rotation speed of the engine and the torque of the engine do not change within a certain time.
In another aspect of the present invention, an engine misfire monitoring apparatus is further provided, which is configured to perform the above-mentioned engine misfire monitoring method, wherein the monitoring apparatus includes: an acquisition unit and a control unit, wherein:
the acquisition unit is used for acquiring a current strain value on the main bearing cover, the rotating speed of the engine and the torque of the engine;
the control unit is used for obtaining the current cylinder pressure of the cylinder according to the current strain value on the main bearing cover, obtaining the cylinder pressure under the specific working condition of the cylinder according to the rotating speed of the engine and the torque of the engine, and controlling the alarm to give an alarm and controlling the engine to enter the torque limiting mode according to the fact that the current cylinder pressure of the cylinder is smaller than the cylinder pressure under the specific working condition of the cylinder.
The invention also provides a monitoring system for the engine misfire, which comprises a memory and the monitoring device for the engine misfire, wherein the memory stores the instruction of the monitoring method for the engine misfire;
the monitoring system for an engine misfire further includes: a main bearing cap;
the strain gauge is arranged on the main bearing cover.
Drawings
Various other advantages and benefits will become apparent to those of ordinary skill in the art upon reading the following detailed description of the preferred embodiments. The drawings are only for purposes of illustrating the preferred embodiments and are not to be construed as limiting the invention. Also, like parts are designated with like reference numerals throughout the drawings. In the drawings:
FIG. 1 schematically illustrates a flow chart of a method of monitoring engine misfire according to an embodiment of the present disclosure;
FIG. 2 schematically illustrates a logic control block diagram of a method of monitoring engine misfire according to an embodiment of the present disclosure;
fig. 3 schematically shows a structural diagram of a monitoring system for an engine misfire according to an embodiment of the present invention.
1: a main bearing cap; 2: a strain gauge.
DETAILED DESCRIPTION OF EMBODIMENT (S) OF INVENTION
Exemplary embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. While exemplary embodiments of the present disclosure are shown in the drawings, it should be understood that the present disclosure may be embodied in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the disclosure to those skilled in the art.
It is to be understood that the terminology used herein is for the purpose of describing particular example embodiments only, and is not intended to be limiting. As used herein, the singular forms "a", "an" and "the" may be intended to include the plural forms as well, unless the context clearly indicates otherwise. The terms "comprises," "comprising," "including," and "having" are inclusive and therefore specify the presence of stated features, steps, operations, elements, and/or components, but do not preclude the presence or addition of one or more other features, steps, operations, elements, components, and/or groups thereof. The method steps, processes, and operations described herein are not to be construed as necessarily requiring their performance in the particular order described or illustrated, unless specifically identified as an order of performance. It should also be understood that additional or alternative steps may be used.
Although the terms first, second, third, etc. may be used herein to describe various elements, components, regions, layers and/or sections, these elements, components, regions, layers and/or sections should not be limited by these terms. These terms may be only used to distinguish one element, component, region, layer or section from another region, layer or section. Terms such as "first," "second," and other numerical terms when used herein do not imply a sequence or order unless clearly indicated by the context. Thus, a first element, component, region, layer or section discussed below could be termed a second element, component, region, layer or section without departing from the teachings of the example embodiments.
For convenience of description, spatially relative terms, such as "inner", "outer", "lower", "below", "upper", "above", and the like, may be used herein to describe one element or feature's relationship to another element or feature as illustrated in the figures. Such spatially relative terms are intended to encompass different orientations of the device in use or operation in addition to the orientation depicted in the figures. For example, if the device in the figures is turned over, elements described as "below" or "beneath" other elements or features would then be oriented "above" or "over" the other elements or features. Thus, the example term "at 8230; \8230; below" may include both upper and lower orientations. The device may be otherwise oriented (rotated 90 degrees or at other orientations) and the spatially relative descriptors used herein interpreted accordingly.
As shown in fig. 1, the method for monitoring engine misfire in the present embodiment includes the steps of:
s1, obtaining a current strain value on a main bearing cover, the rotating speed of an engine and the torque of the engine;
s2, obtaining the current cylinder pressure of the cylinder according to the current strain value on the main bearing cover, obtaining the cylinder pressure under the specific working condition of the cylinder according to the rotating speed of the engine and the torque of the engine, and controlling an alarm to give an alarm and controlling the engine to enter a torque limiting mode according to the fact that the current cylinder pressure of the cylinder is smaller than the cylinder pressure under the specific working condition of the cylinder.
Specifically, when the gas engine catches fire, the explosion pressure in the cylinder is obviously reduced, the load of the main bearing influenced by the explosion pressure is obviously reduced, the change of the current strain value on the main bearing cover is analyzed, the engine catching fire condition can be monitored, and an alarm signal is timely sent to an engine ECU (electronic control Unit).
The strain amount refers to an amount of change in the geometry and dimensions of the test piece under the influence of external force, temperature, and the like, resulting in a change in the unit length. Generally expressed as Δ l/l, where Δ l refers to the amount of change and l refers to the unit length range.
The engine is controlled to enter the torque limiting and alarming mode through the current strain value of the main bearing, the misfire can be monitored, the state of the engine can be corrected, or the engine is prevented from being out of work in other modes, and the normal operation of the engine is guaranteed. The alarm can prompt a driver to stop, deal with or report for repair in time.
In some embodiments of the present invention, obtaining the cylinder pressure for the specific operating condition of the cylinder according to the rotational speed of the engine and the torque of the engine comprises:
accumulating the fire coefficient, controlling an alarm to give an alarm when the accumulated fire coefficient exceeds the set fire coefficient, and controlling the engine to enter a torque limiting mode.
When the accumulated fire coefficient exceeds a certain limit value, the ECU judges that fire is occurring, and alarms and subsequent protective treatment are carried out, otherwise, the monitoring is continued.
In some embodiments of the present invention, accumulating the misfire coefficients comprises:
accumulating a first misfire coefficient when the current cylinder pressure of the cylinder is smaller than the cylinder pressure under a first specific working condition; the cylinder pressure of the cylinder is smaller than that under a second specific working condition, and a second misfire coefficient is accumulated; the cylinder pressure under the second specific working condition is smaller than that under the first specific working condition, and the secondary misfire coefficient is larger than that under the first specific working condition.
If the current cylinder pressure of the cylinder is smaller than the cylinder pressure of 6bar under the second specific working condition, the first misfire coefficient is 1, the current cylinder pressure of the cylinder is smaller than the cylinder pressure of 10bar under the first specific working condition, and the second misfire coefficient is 0.5.
Specifically, the present invention is not limited to two specific operating conditions, and may perform specific analysis and calculation for a plurality of specific operating condition states according to specific situations.
In some embodiments of the invention, controlling the alarm to alarm and controlling the engine to enter the torque limit mode comprises:
and controlling an alarm to give an alarm and controlling the opening degree of a throttle valve of the engine to be reduced.
Specifically, the throttle opening of the engine is controlled to be reduced, and the engine is operated at a low load. Namely, a 'torque-limiting' mode is started, and gas injection is reduced, so that the aim of reducing unburned gas reaching aftertreatment is fulfilled, and excessive reaction of the unburned gas due to fire in aftertreatment is avoided.
In some embodiments of the present invention, obtaining the current cylinder pressure of the cylinder from the current strain value on the main bearing cap comprises:
and obtaining the current cylinder pressure of the cylinder according to the current strain value on the main bearing cover and a strain-cylinder pressure relation curve.
In some embodiments of the present invention, obtaining the current cylinder pressure of the cylinder based on the current strain value on the main bearing cap further comprises:
and obtaining the current cylinder pressure of the cylinder according to the current strain value on the main bearing cover, wherein the current cylinder pressure is not changed within a certain time according to the rotating speed of the engine and the torque of the engine.
As shown in FIG. 2, after the engine is operated, the system is started, the ECU judges the working condition of the engine, and the cylinder pressure of the engine is changed in real time along with the change of the rotating speed and the torque. The ECU reads the numerical values of the rotating speed and the torque of the engine, monitors the change conditions of the rotating speed and the torque of the engine, judges the working condition of the engine to be suitable for fire monitoring when the rotating speed and the torque of the engine are stable within a certain time (for example, 10 s), and starts a fire monitoring module.
When the engine operates under a specific monitoring working condition, the monitoring module reads dynamic strain data, analyzes the strain data of the main bearing cover and obtains a bearing load and a cylinder pressure value through calculation; for example, the fire monitoring module reads the dynamic strain value of the main bearing cap within a certain time (for example, 10 s), acquires the corresponding cylinder pressure according to a calibrated strain-cylinder pressure relation curve embedded in the monitoring module, and transmits the corresponding cylinder pressure to the ECU.
Comparing the normal cylinder pressure range under a specific working condition by the ECU through the cylinder pressure value and the working condition of the engine, and if the cylinder pressure exceeds a threshold value, automatically accumulating the fire coefficient by the ECU, otherwise, continuously monitoring; the ECU determines whether or not the normal cylinder pressure range is exceeded. If the cylinder pressure is lower than the cylinder pressure range, the misfire condition is determined to occur. And when the fire coefficient exceeds a certain limit value, the ECU judges that the fire is on, and performs alarming and subsequent protective treatment, otherwise, the monitoring is continued. Setting a fire coefficient in ECU control logic, detecting a fire phenomenon, wherein the fire coefficient is +1, and accumulating the fire coefficient to more than 10 within a set time period (10 min), so that the engine is definitely in fire, the ECU controls the torque limit of the engine, and sends an alarm signal.
Another aspect of the present invention also provides an engine misfire monitoring apparatus for performing the above-mentioned engine misfire monitoring method, wherein the monitoring apparatus comprises: an acquisition unit and a control unit, wherein:
the acquisition unit is used for acquiring a current strain value on the main bearing cover, the rotating speed of the engine and the torque of the engine, wherein the acquisition unit is a monitoring module of the engine;
the control unit is used for obtaining the current cylinder pressure of the cylinder according to the current strain value on the main bearing cover, obtaining the cylinder pressure under the specific working condition of the cylinder according to the rotating speed of the engine and the torque of the engine, and controlling the alarm to give an alarm and controlling the engine to enter a torque limiting mode according to the fact that the current cylinder pressure of the cylinder is smaller than the cylinder pressure under the specific working condition of the cylinder, wherein the control unit is an engine ECU.
As shown in fig. 3, another aspect of the present invention further provides a system for monitoring engine misfire, which includes a memory and the above-mentioned device for monitoring engine misfire, wherein the memory stores instructions of the above-mentioned method for monitoring engine misfire;
the monitoring system for an engine misfire further includes: a main bearing cap 1;
the strain gage 2 is arranged on the main bearing cover 1, and the strain gage 2 is arranged on the main bearing cover 1.
In the method for monitoring the engine fire, the current strain value of the strain gauge on the main bearing cover is collected and processed to reflect the stress of the main bearing cover, analyze the occurrence of the fire phenomenon, send alarm information to an ECU and monitor the engine fire.
In conclusion, in the method for monitoring the engine fire, the current cylinder pressure of the cylinder is obtained according to the current strain value on the main bearing cover, the alarm is controlled to give an alarm and the engine is controlled to enter the torque limiting mode according to the fact that the current cylinder pressure of the cylinder is smaller than the cylinder pressure of the cylinder under the specific working condition, the engine is controlled to enter the torque limiting mode and give an alarm according to the current strain value of the main bearing, the fire can be monitored, the state of the engine can be corrected, the engine can be prevented from being out of work in other modes, and the normal operation of the engine can be guaranteed.
The above description is only a preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention are also within the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.

Claims (5)

1. A method of monitoring engine misfire, the method comprising the steps of:
acquiring a current strain value on a main bearing cover, the rotating speed of an engine and the torque of the engine;
obtaining the current cylinder pressure of the cylinder according to the current strain value on the main bearing cover, obtaining the cylinder pressure of the cylinder under a specific working condition according to the rotating speed of the engine and the torque of the engine, and controlling an alarm to give an alarm and controlling the engine to enter a torque limiting mode according to the condition that the current cylinder pressure of the cylinder is smaller than the cylinder pressure of the cylinder under the specific working condition;
the method for obtaining the cylinder pressure of the cylinder under the specific working condition according to the rotating speed of the engine and the torque of the engine comprises the following steps:
accumulating the fire coefficient, wherein the accumulated fire coefficient exceeds the set fire coefficient, controls an alarm to give an alarm and controls the engine to enter a torque limiting mode;
the accumulated misfire coefficients include:
the current cylinder pressure of the cylinder is smaller than the cylinder pressure under a first specific working condition, and a first misfire coefficient is accumulated; the cylinder pressure of the cylinder is smaller than that under a second specific working condition, and a second misfire coefficient is accumulated; the cylinder pressure under the second specific working condition is smaller than that under the first specific working condition, and the second misfire coefficient is larger than the first misfire coefficient;
the obtaining a current cylinder pressure of a cylinder according to a current strain value on the main bearing cap comprises:
and obtaining the current cylinder pressure of the cylinder according to the current strain value on the main bearing cover and a strain-cylinder pressure relation curve.
2. The method of monitoring engine misfire according to claim 1, wherein controlling the alarm to alarm and controlling the engine to enter the torque limited mode comprises:
and controlling an alarm to give an alarm and controlling the opening degree of a throttle valve of the engine to be reduced.
3. The method of monitoring engine misfire according to claim 1, wherein the obtaining a current cylinder pressure of a cylinder based on a current strain value on the main bearing cap further comprises:
and obtaining the current cylinder pressure of the cylinder according to the current strain value on the main bearing cover, wherein the rotation speed of the engine and the torque of the engine do not change within a certain time.
4. An engine misfire monitoring apparatus for performing the engine misfire monitoring method as recited in claim 1, the apparatus comprising: an acquisition unit and a control unit, wherein:
the acquisition unit is used for acquiring a current strain value on the main bearing cover, the rotating speed of the engine and the torque of the engine;
the control unit is used for obtaining the current cylinder pressure of the cylinder according to the current strain value on the main bearing cover, obtaining the cylinder pressure under the specific working condition of the cylinder according to the rotating speed of the engine and the torque of the engine, and controlling the alarm to give an alarm and controlling the engine to enter the torque limiting mode according to the fact that the current cylinder pressure of the cylinder is smaller than the cylinder pressure under the specific working condition of the cylinder.
5. A monitoring system for an engine misfire, the monitoring system comprising a memory and the monitoring apparatus for an engine misfire of claim 4, the memory having stored therein instructions of the monitoring method for an engine misfire of any one of claims 1 to 3;
the monitoring system for an engine misfire further includes: a main bearing cap;
the strain gauge is arranged on the main bearing cover.
CN202011105740.3A 2020-10-15 2020-10-15 Method, device and system for monitoring engine fire Active CN112360640B (en)

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Application Number Priority Date Filing Date Title
CN202011105740.3A CN112360640B (en) 2020-10-15 2020-10-15 Method, device and system for monitoring engine fire

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Application Number Priority Date Filing Date Title
CN202011105740.3A CN112360640B (en) 2020-10-15 2020-10-15 Method, device and system for monitoring engine fire

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CN112360640B true CN112360640B (en) 2023-01-24

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Publication number Priority date Publication date Assignee Title
JP4096835B2 (en) * 2003-08-06 2008-06-04 トヨタ自動車株式会社 Control device for internal combustion engine and misfire determination method for internal combustion engine
DE102006037398A1 (en) * 2006-05-31 2007-12-06 Robert Bosch Gmbh Method and device for the indirect determination of the cylinder pressure of reciprocating engines
JP4681511B2 (en) * 2006-06-20 2011-05-11 三菱重工業株式会社 Engine misfire output or load limit operation method and apparatus
JP5496004B2 (en) * 2010-07-29 2014-05-21 三菱重工業株式会社 Engine misfire detection apparatus and method
JP6032136B2 (en) * 2013-06-05 2016-11-24 トヨタ自動車株式会社 Misfire detection system for internal combustion engine
CN104863712A (en) * 2014-02-21 2015-08-26 卡特彼勒发动机有限责任两合公司 Detecting Misfiring In A Gaseous Fuel Operated Internal Combustion Engine

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