CN111156093B - Control method and device for diesel-alcohol dual-fuel engine - Google Patents

Control method and device for diesel-alcohol dual-fuel engine Download PDF

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Publication number
CN111156093B
CN111156093B CN201911419564.8A CN201911419564A CN111156093B CN 111156093 B CN111156093 B CN 111156093B CN 201911419564 A CN201911419564 A CN 201911419564A CN 111156093 B CN111156093 B CN 111156093B
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engine
oil temperature
current
fuel
engine oil
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CN111156093A (en
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康天钦
王波
尹晓军
贾义
张玉娟
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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
    • F02D41/0025—Controlling engines characterised by use of non-liquid fuels, pluralities of fuels, or non-fuel substances added to the combustible mixtures
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01M—LUBRICATING OF MACHINES OR ENGINES IN GENERAL; LUBRICATING INTERNAL COMBUSTION ENGINES; CRANKCASE VENTILATING
    • F01M11/00—Component parts, details or accessories, not provided for in, or of interest apart from, groups F01M1/00 - F01M9/00
    • F01M11/10—Indicating devices; Other safety devices
    • 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
    • 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
    • Y02T10/30—Use of alternative fuels, e.g. biofuels
    • 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)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Output Control And Ontrol Of Special Type Engine (AREA)
  • Combined Controls Of Internal Combustion Engines (AREA)

Abstract

The application provides a control method and a control device of a diesel-alcohol dual-fuel engine, which are used for judging the current heat load of the engine by using the engine oil temperature, and controlling the engine to be switched to a dual-fuel working mode if the current engine oil temperature parameter of the engine is greater than a preset engine oil temperature threshold (the engine oil temperature threshold can be from tests or simulation analysis). The engine is controlled by detecting the current engine oil temperature of the diesel-alcohol dual-fuel engine, and for a steel piston type with an engine oil temperature-saving control measure, the engine oil temperature can be higher than the cooling water temperature in the process of heating the vehicle, and the corresponding relative error of the detected engine oil temperature can be smaller than the relative error of the detected cooling water temperature, so that the scheme provided by the application can have higher accuracy compared with the existing control scheme.

Description

Control method and device for diesel-alcohol dual-fuel engine
Technical Field
The invention relates to the technical field of automatic control, in particular to a control method and a control device for a diesel-alcohol dual-fuel engine.
Background
Diesel-alcohol dual fuel engine refers to an engine that can use diesel and another alternative fuel (such as methanol) to perform mixed combustion simultaneously according to a certain mixture ratio under specific conditions.
The diesel-alcohol dual-fuel engine can run in a single-fuel mode due to higher latent heat of vaporization of alcohol fuel during cold start, only diesel is used as fuel, the engine is controlled to enter the dual-fuel mode at a proper time after the engine is started for a period of time and the engine is sufficiently high in thermal load, and two kinds of fuel are injected through a cylinder or an air inlet channel to be combusted in the cylinder.
The existing control method is that a temperature sensor is used for detecting the temperature of cooling water of a diesel-alcohol dual-fuel engine in real time, and when the temperature of the cooling water detected by the sensor is higher than a certain threshold value, the engine is controlled to enter a dual-fuel mode at the right moment. However, when the engine adopts an oil thermostat to accelerate the warm-up process or for a steel piston engine, since the temperature of the cooling water of the warm-up vehicle is low, the relative error of the temperature of the cooling water detected by the temperature sensor is large, so that the method for determining the engine heat load according to the reading of the temperature sensor of the cooling water has low accuracy and cannot conveniently judge whether the variation of the cooling water temperature is affected by the abnormality of the flow rate of the cooling water.
Disclosure of Invention
In order to solve the above-mentioned shortcomings of the prior art, the present application provides a control method and device for a diesel-alcohol dual-fuel engine, so as to provide a more accurate dual-fuel mode switching control scheme.
The first aspect of the present application provides a method for controlling a diesel-alcohol dual-fuel engine, including:
detecting the current engine oil temperature of the engine;
judging whether the current engine oil temperature of the engine is greater than a preset engine oil temperature threshold value or not;
and if the current engine oil temperature of the engine is greater than the engine oil temperature threshold value, controlling the engine to be switched to a dual-fuel working mode.
Optionally, the engine is a diesel methanol dual fuel engine;
the controlling the engine to switch to a dual fuel operating mode includes:
and opening a methanol nozzle, and controlling the methanol nozzle to inject methanol to the engine so that the engine burns diesel and methanol mixed fuel.
Optionally, if the current engine oil temperature of the engine is greater than the engine oil temperature threshold, controlling the engine to switch to the dual-fuel operating mode, before, further including:
detecting the current oil pressure of the engine;
judging whether the current engine oil pressure of the engine is within a design range or not;
if the current engine oil temperature of the engine is greater than the engine oil temperature threshold, controlling the engine to switch to a dual-fuel working mode, including:
and if the current engine oil temperature of the engine is greater than the engine oil temperature threshold value and the current engine oil pressure of the engine is within the design range, controlling the engine to be switched to a dual-fuel working mode.
The second aspect of the present application provides a control apparatus for a diesel-alcohol dual-fuel engine, comprising:
the detection unit is used for detecting the current engine oil temperature of the engine;
the judging unit is used for judging whether the current engine oil temperature of the engine is greater than a preset engine oil temperature threshold value or not;
and the control unit is used for controlling the engine to be switched to a dual-fuel working mode if the current engine oil temperature of the engine is greater than the engine oil temperature threshold value.
Optionally, the engine is a diesel methanol dual-fuel engine;
when the control unit controls the engine to be switched to the dual-fuel working mode, the control unit is specifically used for:
and opening a methanol nozzle, and controlling the methanol nozzle to inject methanol to the engine so that the engine burns diesel and methanol mixed fuel.
Optionally, the detection unit is further configured to:
detecting the current oil pressure of the engine;
the judging unit is further configured to:
judging whether the current engine oil pressure of the engine is in a design range;
if the current engine oil temperature of the engine is greater than the engine oil temperature threshold value, the control unit is specifically configured to:
and if the current engine oil temperature of the engine is greater than the engine oil temperature threshold value and the current engine oil pressure of the engine is within the design range, controlling the engine to be switched to a dual-fuel working mode.
The application provides a diesel-alcohol dual-fuel engine control method and device, which are used for judging the current heat load of an engine by using the temperature of engine oil, and controlling the engine to be switched to a dual-fuel working mode if the current engine oil temperature parameter of the engine is larger than a preset engine oil temperature threshold (the engine oil temperature threshold can be from tests or simulation analysis). The engine is controlled by detecting the current engine oil temperature of the diesel-alcohol dual-fuel engine, and for a steel piston type with an engine oil temperature-saving control measure, the engine oil temperature can be higher than the cooling water temperature in the process of heating the vehicle, and the corresponding relative error of the detected engine oil temperature can be smaller than the relative error of the detected cooling water temperature, so that the scheme provided by the application can have higher accuracy compared with the existing control scheme.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the provided drawings without creative efforts.
FIG. 1 is a flow chart of a control method of a diesel-alcohol dual-fuel engine provided by an embodiment of the application;
FIG. 2 is a diagram illustrating a relationship between an engine oil temperature and a cooling water temperature according to an embodiment of the present disclosure;
FIG. 3 is a flow chart of a method of fault detection for an engine according to yet another embodiment of the present application;
fig. 4 is a schematic structural diagram of a control device of a diesel-alcohol dual-fuel engine according to an embodiment of the present application.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be obtained by a person skilled in the art without making any creative effort based on the embodiments in the present invention, belong to the protection scope of the present invention.
A first embodiment of the present application provides a flow chart of a method for controlling an engine, referring to fig. 1, the method comprising the steps of:
s101, detecting the current engine oil temperature of the engine.
It can be understood that the embodiment of the application can be executed after the diesel-alcohol dual-fuel engine is started in the diesel mode, and the current engine oil temperature of the engine is detected in real time, so that the time when the engine is switched from the diesel mode to the diesel-alcohol dual-fuel mode during the warm-up process is accurately selected.
The engine may be any dual fuel engine, for example, a diesel methanol dual fuel engine.
In combination with the description of the background art section of the present application, controlling the engine to switch from the single fuel mode to the dual fuel mode generally occurs after the engine is cold started, when the engine is started from a cold state (the cold state may be considered as a state in which the cylinder and other engine components are at ambient temperature), the temperature of the engine (generally referring to the temperature of the cylinder and other main components of the engine, which may also be understood as a thermal load of the engine) is low, and if the mixed fuel is directly provided at this time, there is a problem of insufficient combustion, so that the engine will first operate in the single fuel mode after cold start, only fuel oil (such as diesel oil or gasoline) or gas (such as natural gas) is combusted, and after the temperature of the engine is raised to a certain extent, the mixed fuel is provided, so that the engine operates in the dual fuel mode. Generally, the state of the engine when the mixed fuel is allowed to be burned may be referred to as a warm state of the engine.
In summary, the method provided by any embodiment of the present application is used for running after the engine is cold started, so as to provide a scheme for controlling the engine to switch from the single-fuel mode to the dual-fuel mode.
The current engine oil temperature of the engine in step S101 is the temperature of the engine oil that has passed through the piston oscillation oil chambers of all the pistons of the engine, and has been cooled and filtered.
S102, judging whether the current engine oil temperature of the engine is larger than a preset engine oil temperature threshold value.
If the current engine oil temperature of the engine is greater than the preset engine oil temperature threshold, step S103 is executed.
Optionally, if the determination result is negative, that is, the current engine oil temperature of the engine is less than or equal to the preset engine oil temperature threshold, the step S101 may be directly executed, the current engine oil temperature of the engine is detected again, or the step S101 may be executed after waiting for a certain time interval.
In other words, in practical applications, the method provided in any embodiment of the present application may be repeatedly executed at preset detection intervals. After the engine is cold-started, an Electronic Control Unit (ECU, generally referred to as a microcomputer controller installed in various automobiles and used for controlling engines of the automobiles and other devices) for executing the Control method provided in any embodiment of the present application may repeatedly detect the current engine oil temperature of the engine at detection intervals, obtain the current engine oil temperature of the engine once every detection, determine whether to Control the engine to enter a dual-fuel mode by executing corresponding steps of the method provided in any embodiment of the present application, and Control the engine to switch to the dual-fuel operating mode when conditions are met.
Alternatively, the engine oil temperature threshold may be 75 ℃.
And S103, controlling the engine to be switched to a dual-fuel working mode.
The specific control method differs depending on the structure of the engine to be controlled. Taking a diesel and methanol dual-fuel engine as an example, a methanol nozzle is generally arranged at an air inlet pipe of the engine or at an air inlet passage or a cylinder cover of each cylinder of the engine, if the engine needs to be controlled to be switched to a dual-fuel working mode, the ECU opens the methanol nozzle arranged at the position, methanol is injected into the air inlet pipe of the engine or the air inlet passage or the cylinder cover of each cylinder, and the injected methanol is finally mixed with air and diesel oil injected into the cylinder to form air, diesel oil and methanol mixed gas and is combusted. The operating state of the engine at this time is referred to as a dual fuel operating mode.
The embodiment provides an engine control method, which includes detecting a current engine oil temperature of an engine, and judging whether the current engine oil temperature of the engine is greater than a preset engine oil temperature threshold; and if the current engine oil temperature of the engine is greater than the engine oil temperature threshold value, controlling the engine to be switched to a dual-fuel working mode.
The scheme determines under what conditions the engine is controlled to be switched to the dual-fuel working mode by detecting the current engine oil temperature of the engine. For an engine equipped with an oil temperature control measure, the oil temperature is generally higher than the cooling water temperature, and the corresponding relative error of the detected oil temperature is smaller than that of the detected cooling water temperature, so that the scheme provided by the application has higher accuracy compared with the existing control scheme.
For example, in some current diesel-methanol dual-fuel engines, a piston of a cylinder is generally made of a steel piston, and a piston oscillation oil cavity of the steel piston is closer to a combustion chamber of the cylinder, so that engine oil flowing through the piston oscillation oil cavity can be quickly raised to a higher temperature after the engine is cold started, that is, after the steel piston engine is cold started, the temperature of cooling water at the same time is lower than the temperature of the engine oil.
The temperature sensor for measuring the oil temperature and the cooling water temperature correspondingly reduces relative measurement relative error along with the rise of the temperature of the measured object, that is, for an engine (including but not limited to the steel piston engine) configured with an oil temperature control measure, the oil temperature measured by the oil temperature sensor is closer to the actual engine temperature relative to the cooling water temperature measured by the cooling water temperature sensor, therefore, the temperature of the engine is determined according to the oil temperature measured by the sensor, and then the engine is controlled to be switched to the dual-fuel operating mode, which is more accurate compared with the existing control scheme executed based on the measured cooling water temperature.
The engine oil temperature threshold in the above embodiment may be determined according to a correspondence relationship between a pre-calibrated cooling water temperature and an engine oil temperature. The corresponding relation between the temperature of the cooling water and the temperature of the engine oil can be obtained through bench test measurement or simulation analysis.
In the test process, the engine on the bench can be directly started from a cold state, and then the engine oil temperature and the cooling water temperature of the engine are read once every certain time until the engine enters a warm state, so that a set of test data can be obtained. The above test process may be repeated many times to collect a plurality of sets of test data, and then the collected test data sets are processed to eliminate the relative error between the cooling water temperature sensor and the engine oil temperature sensor as much as possible, so as to obtain a relatively accurate corresponding relationship table between the engine oil temperature and the cooling water temperature, for example, after testing an engine of a certain model using a steel piston and an engine oil thermostat and processing the test data, an engine oil-cooling water temperature relationship curve as shown in fig. 2 may be obtained.
After the engine oil-cooling water temperature relation curve is calibrated, the cooling water temperature threshold value used for controlling the engine to be switched to the dual-fuel mode in the prior art is determined, and then the engine oil temperature threshold value corresponding to the cooling water temperature threshold value can be found out from the relation curve.
In combination with the engine control methods provided by the three embodiments, a fourth embodiment of the present application further provides a fault detection method based on the oil temperature and the oil pressure of the engine, which is used to provide an engine fault detection method by combining the current oil temperature of the engine detected in the method for controlling the engine to switch to the dual-fuel operating mode and referring to the current oil pressure of the engine, and please refer to fig. 3, where the method includes the following steps:
s301, detecting the current oil pressure of the engine.
S302, judging whether the current engine oil pressure of the engine is in a design range.
If the current oil pressure of the engine is within the design range, step S303 is executed, otherwise, if the current oil pressure of the engine is not within the design range, step S304 is executed.
The design range of the engine oil pressure can be obtained by pre-calibrating through a bench test.
Further, the engine oil pressure has different design ranges under different working conditions of the engine, the design range of the engine oil pressure under each working condition can be calibrated through a bench test, and when the step S302 is executed, the current working condition of the engine can be determined first, and then the design range corresponding to the current working condition is selected to execute the step S302.
And S303, determining that the current state of the engine is normal.
And S304, determining that the engine has a fault.
The engine failure here means that the current flow rate of the engine oil is abnormal.
After determining that the engine has a fault, a preset countermeasure may be further taken, such as outputting a fault alarm message (including but not limited to triggering a preset alarm ring, lighting a fault alarm lamp), further collecting other engine parameters to locate the fault, and the like.
Optionally, when the control method of the engine provided in the embodiment corresponding to fig. 1 is executed, after it is determined that the current engine oil temperature of the engine is greater than the preset engine oil temperature threshold, the fault detection method provided in this embodiment may be executed to determine whether the current engine oil flow of the engine is abnormal, if the current engine oil flow of the engine is found to be abnormal, the subsequent action of controlling the engine to switch to the dual-fuel mode is not executed, otherwise, if it is determined that the current engine oil flow is normal according to the current engine oil pressure and the current engine oil temperature of the engine is greater than the preset engine oil temperature threshold, the engine is controlled to switch to the dual-fuel mode.
In combination with the control method of the engine provided in the foregoing embodiment of the present application, another embodiment of the present application further provides a control device of the engine, please refer to fig. 4, the device includes the following units:
a detection unit 401 for detecting the current oil temperature of the engine.
The determining unit 402 is configured to determine whether a current oil temperature of the engine is greater than a preset oil temperature threshold.
The control unit 403 is configured to control the engine to switch to the dual-fuel operating mode if the current engine oil temperature of the engine is greater than the engine oil temperature threshold.
Optionally, the control device of the engine provided by the embodiment can be used for controlling a diesel methanol dual-fuel engine.
When the control unit 403 controls the engine to switch to the dual-fuel operating mode, the control unit is specifically configured to:
and opening the methanol nozzle, and controlling the methanol nozzle to inject methanol to the engine so that the engine burns the diesel and methanol mixed fuel.
Optionally, the detecting unit 401 is further configured to:
the current oil pressure of the engine is detected.
The determining unit 402 is further configured to:
and judging whether the current oil pressure of the engine is within a design range.
The control unit 403 is specifically configured to:
and if the current engine oil temperature of the engine is greater than the engine oil temperature threshold value and the current engine oil pressure of the engine is in the design range, controlling the engine to be switched to the dual-fuel working mode.
For a specific working principle of the control device of the engine provided in this embodiment, reference may be made to a control method of the engine provided in any embodiment of the present application, and details are not described here.
The application provides an engine control device, wherein a detection unit 401 detects the current engine oil temperature of an engine, and a judgment unit 402 judges whether the current engine oil temperature of the engine is greater than a preset engine oil temperature threshold value; if the current engine oil temperature of the engine is greater than the engine oil temperature threshold, the control unit 403 controls the engine to switch to the dual-fuel operating mode. The scheme realizes the control of the engine by detecting the current engine oil temperature of the engine, and for the engine configured with engine oil temperature control measures, the engine oil temperature is generally higher than the cooling water temperature, and the corresponding relative error of the detected engine oil temperature can be smaller than the relative error of the detected cooling water temperature, so that the scheme provided by the application has higher accuracy compared with the existing control scheme.
A person skilled in the art can make or use the present application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the application. Thus, the present application is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims (6)

1. A control method of a diesel-alcohol dual-fuel engine is characterized by being applied to an engine with organic oil temperature control measures, and comprising the following steps:
detecting the current engine oil temperature of the engine; the current engine oil temperature is the temperature of the engine oil which flows through piston oscillation oil cavities of all pistons of the engine and is cooled and filtered;
judging whether the current engine oil temperature of the engine is greater than a preset engine oil temperature threshold value or not;
and if the current engine oil temperature of the engine is greater than the engine oil temperature threshold value, controlling the engine to be switched to a dual-fuel working mode.
2. The control method according to claim 1, characterized in that the engine is a diesel methanol dual-fuel engine;
the controlling the engine to switch to a dual fuel operating mode includes:
and opening a methanol nozzle, and controlling the methanol nozzle to inject methanol to the engine so that the engine burns diesel and methanol mixed fuel.
3. The method of claim 1, wherein said controlling said engine to switch to a dual fuel operating mode if a current oil temperature of said engine is greater than said oil temperature threshold further comprises:
detecting the current oil pressure of the engine;
judging whether the current engine oil pressure of the engine is in a design range;
if the current engine oil temperature of the engine is greater than the engine oil temperature threshold, controlling the engine to switch to a dual-fuel working mode, including:
and if the current engine oil temperature of the engine is greater than the engine oil temperature threshold value and the current engine oil pressure of the engine is within the design range, controlling the engine to be switched to a dual-fuel working mode.
4. A control device of a diesel-alcohol dual-fuel engine is characterized by being applied to an engine with organic oil temperature control measures, and comprising the following components:
the detection unit is used for detecting the current engine oil temperature of the engine; the current engine oil temperature is the temperature of the engine oil which flows through piston oscillation oil cavities of all pistons of the engine and is cooled and filtered;
the judging unit is used for judging whether the current engine oil temperature of the engine is greater than a preset engine oil temperature threshold value or not;
and the control unit is used for controlling the engine to be switched to a dual-fuel working mode if the current engine oil temperature of the engine is greater than the engine oil temperature threshold value.
5. The control apparatus according to claim 4, characterized in that the engine is a diesel methanol dual fuel engine;
when the control unit controls the engine to be switched to the dual-fuel working mode, the control unit is specifically used for:
and opening a methanol nozzle, and controlling the methanol nozzle to inject methanol to the engine so that the engine burns diesel and methanol mixed fuel.
6. The control device according to claim 4, wherein the detection unit is further configured to:
detecting the current oil pressure of the engine;
the judging unit is further configured to:
judging whether the current engine oil pressure of the engine is in a design range;
if the current engine oil temperature of the engine is greater than the engine oil temperature threshold value, the control unit is specifically configured to:
and if the current engine oil temperature of the engine is greater than the engine oil temperature threshold value and the current engine oil pressure of the engine is within the design range, controlling the engine to be switched to a dual-fuel working mode.
CN201911419564.8A 2019-12-31 2019-12-31 Control method and device for diesel-alcohol dual-fuel engine Active CN111156093B (en)

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