CN110230548B - Method and device for improving exhaust temperature of engine - Google Patents
Method and device for improving exhaust temperature of engine Download PDFInfo
- Publication number
- CN110230548B CN110230548B CN201910733611.XA CN201910733611A CN110230548B CN 110230548 B CN110230548 B CN 110230548B CN 201910733611 A CN201910733611 A CN 201910733611A CN 110230548 B CN110230548 B CN 110230548B
- Authority
- CN
- China
- Prior art keywords
- injection
- preset
- target engine
- preset number
- injection valves
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Images
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
- F02B43/00—Engines characterised by operating on gaseous fuels; Plants including such engines
- F02B43/10—Engines or plants characterised by use of other specific gases, e.g. acetylene, oxyhydrogen
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D41/00—Electrical control of supply of combustible mixture or its constituents
- F02D41/0025—Controlling engines characterised by use of non-liquid fuels, pluralities of fuels, or non-fuel substances added to the combustible mixtures
- F02D41/0027—Controlling engines characterised by use of non-liquid fuels, pluralities of fuels, or non-fuel substances added to the combustible mixtures the fuel being gaseous
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D41/00—Electrical control of supply of combustible mixture or its constituents
- F02D41/30—Controlling fuel injection
- F02D41/32—Controlling fuel injection of the low pressure type
- F02D41/34—Controlling fuel injection of the low pressure type with means for controlling injection timing or duration
- F02D41/345—Controlling injection timing
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D41/00—Electrical control of supply of combustible mixture or its constituents
- F02D41/30—Controlling fuel injection
- F02D41/32—Controlling fuel injection of the low pressure type
- F02D41/36—Controlling fuel injection of the low pressure type with means for controlling distribution
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
- F02B43/00—Engines characterised by operating on gaseous fuels; Plants including such engines
- F02B43/10—Engines or plants characterised by use of other specific gases, e.g. acetylene, oxyhydrogen
- F02B2043/103—Natural gas, e.g. methane or LNG used as a fuel
-
- 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
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Electrical Control Of Air Or Fuel Supplied To Internal-Combustion Engine (AREA)
Abstract
The application discloses a method and a device for improving exhaust temperature of an engine, wherein the method comprises the following steps: the method comprises the steps of firstly obtaining the total number of injection valves contained in a target engine, closing a first preset number of injection valves, obtaining preset injection quantities of the injection valves, carrying out uniform division on the preset injection quantities according to a second preset number to obtain a uniform division injection quantity, wherein the sum of the second preset number and the first preset number is the total number of the injection valves contained in the target engine, respectively increasing the uniform division injection quantity on the injection quantities of the injection valves of the second preset number, shifting the injection positions of the injection valves of the second preset number according to a preset working cycle crank angle, and sequentially injecting the increased injection quantities at the shifted injection positions. Therefore, the spraying positions, the spraying sequence and the spraying amount of the spraying valves are adjusted by redistributing the spraying amount of the spraying valves on the premise of ensuring that the total spraying amount of each working cycle is unchanged, and the rapid improvement of the exhaust temperature is realized.
Description
Technical Field
The application relates to the technical field of engines, in particular to a method and a device for improving exhaust temperature of an engine.
Background
The engine is one of the most important parts of the motor vehicle as a main unit of power output, but when a natural gas engine is started in a cold state or is in a warm-up process, the exhaust temperature of the engine is generally low, and at the moment, a catalyst is in low reaction efficiency, so that subsequent exhaust gas treatment equipment cannot work normally. Therefore, in order to enable the catalyst to work efficiently as soon as possible and enable subsequent tail gas treatment equipment to work normally as soon as possible, the catalyst needs to be subjected to heat management, and the exhaust temperature of the engine needs to be increased as soon as possible.
At present, the traditional methods for increasing the exhaust temperature of the engine include adjusting an excess air coefficient, adjusting an ignition advance angle, increasing an idle speed of the engine, and the like, but although the methods can increase the exhaust temperature of the engine, the methods may also have adverse effects on subsequent processing equipment, for example, when the exhaust temperature of the engine is increased by adjusting the excess air coefficient, the air coefficient may be excessively adjusted due to improper operation, and the subsequent processing equipment may not work normally.
Therefore, how to use a more advanced technology to replace the conventional method and realize the rapid increase of the exhaust temperature of the engine without affecting the normal operation of the aftertreatment equipment becomes a problem to be solved urgently.
Disclosure of Invention
In order to solve the problems, the application provides a method and a device for improving the exhaust temperature of an engine, and the specific technical scheme is as follows:
in a first aspect, the present application provides a method for increasing exhaust temperature of an engine, the method comprising:
acquiring the total number of injection valves contained in a target engine;
closing a first preset number of injection valves comprised by the target engine; the first preset number is less than a total number of injection valves included in the target engine;
acquiring the preset injection quantity of the injection valves with the first preset number;
equally dividing the preset injection quantity according to a second preset number to obtain an average injection quantity; the sum of the second preset number and the first preset number is the total number of injection valves included in the target engine;
respectively increasing the average injection quantity of the injection quantities of the second preset number of injection valves included in the target engine to obtain increased injection quantities corresponding to the second preset number of injection valves;
shifting the injection positions of the second preset number of injection valves according to a preset one-working-cycle crank angle, and sequentially injecting the increased injection quantities at the shifted injection positions so as to rapidly raise the exhaust temperature of the target engine.
In an alternative implementation, the target engine is a single-injection natural gas engine.
In an alternative implementation, if the target engine includes 4 total injection valves, then the preset one-cycle crank angle is 720 degrees.
In an alternative implementation, the first preset number is 1, and the second preset number is 3,
correspondingly, the shifting the injection positions of the second preset number of injection valves according to the increased injection quantity and a preset crank angle of one working cycle, and sequentially injecting the second preset number of injection valves according to the shifted injection positions so as to rapidly increase the exhaust temperature of the target engine includes:
shifting the injection positions of the second preset number of injection valves by 60 degrees respectively according to the increased injection quantity and a preset working cycle crank angle, and performing sequential injection on the second preset number of injection valves at the shifted injection positions so as to rapidly increase the exhaust temperature of the target engine.
In an optional implementation manner, after shifting injection positions of the second preset number of injection valves according to the increased injection quantity and sequentially injecting the second preset number of injection valves according to the shifted injection positions so as to quickly raise a temperature of the target engine, the method further includes:
when the target engine exhaust temperature reaches a preset temperature, opening a first preset number of injection valves which are closed in the target engine;
and controlling all injection valves contained in the target engine to perform sequential injection at the positions before the deviation according to preset normal injection quantity.
In a second aspect, the present application provides a device for increasing exhaust temperature of an engine, the device comprising:
a first acquisition unit configured to acquire a total number of injection valves included in a target engine;
a closing unit for closing a first preset number of injection valves included in the target engine; the first preset number is less than a total number of injection valves included in the target engine;
a second acquisition unit configured to acquire a preset injection amount of the first preset number of injection valves;
the equalizing unit is used for equalizing the preset injection amount according to a second preset number to obtain an equalized injection amount; the sum of the second preset number and the first preset number is the total number of injection valves included in the target engine;
an increasing unit configured to increase the injection quantities of the second preset number of injection valves included in the target engine by the average injection quantity, respectively, to obtain increased injection quantities corresponding to the second preset number of injection valves, respectively;
and the injection unit is used for offsetting the injection positions of the second preset number of injection valves according to a preset working cycle crank angle and sequentially injecting the increased injection quantities at the offset injection positions so as to quickly improve the exhaust temperature of the target engine.
In an alternative implementation, the target engine is a single-injection natural gas engine.
In an alternative implementation, if the target engine includes 4 total injection valves, then the preset one-cycle crank angle is 720 degrees.
In an alternative implementation, the first preset number is 1, and the second preset number is 3,
correspondingly, the injection unit is specifically configured to:
shifting the injection positions of the second preset number of injection valves by 60 degrees respectively according to the increased injection quantity and a preset working cycle crank angle, and performing sequential injection on the second preset number of injection valves at the shifted injection positions so as to rapidly increase the exhaust temperature of the target engine.
In an optional implementation, the apparatus further includes:
the starting unit is used for starting a first preset number of closed injection valves in the target engine when the target engine exhaust temperature reaches a preset temperature;
and the control unit is used for controlling all injection valves contained in the target engine to perform sequential injection at the positions before deviation according to preset normal injection quantity.
In the method for increasing the exhaust temperature of the engine, firstly, the total number of the injection valves included in the target engine is obtained, then, the injection valves of the first preset number are closed, meanwhile, the preset injection amount of the injection valves of the first preset number is obtained, then, the preset injection amount is divided equally according to the second preset number to obtain an average injection amount, wherein the sum of the second preset number and the first preset number is the total number of the injection valves included in the target engine, then, the injection amounts of the injection valves of the second preset number are respectively increased by the average injection amount, further, the injection positions of the injection valves of the second preset number can be shifted according to a preset crank angle of a working cycle, and the increased injection amounts are sequentially injected at the shifted injection positions, so that the exhaust temperature of the target engine is rapidly increased. Therefore, according to the embodiment of the application, the injection quantity of the first preset number of injection valves in the target engine is reduced, and the injection quantity of the second preset number of injection valves is increased, so that the mixing condition of each injection valve can be changed, the combustion is influenced to change the exhaust temperature, the redistribution of the injection quantity of each injection valve is realized by designing an injection scheduling strategy on the premise of ensuring that the total injection quantity of each working cycle is not changed, the injection position, the injection sequence and the injection quantity of each injection valve are adjusted, and the rapid improvement of the exhaust temperature is further realized.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without inventive labor.
FIG. 1 is a schematic flow chart illustrating a method for increasing exhaust temperature of an engine according to an embodiment of the present disclosure;
FIG. 2 is a diagram illustrating sequential injection of a second predetermined number of injection valves at shifted injection positions by increasing injection quantities provided by an embodiment of the present application;
fig. 3 is a schematic diagram of sequential injections performed by all injection valves included in a target engine at positions before shifting according to preset normal injection quantities, respectively, according to an embodiment of the present application;
fig. 4 is a schematic structural diagram of a device for increasing engine exhaust temperature according to an embodiment of the present disclosure.
Detailed Description
The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only a part of the embodiments of the present application, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
In order to facilitate understanding of the technical solutions provided in the present application, the following briefly describes the research background of the technical solutions in the present application.
As is well known in the background art, when a natural gas engine is started under a low water temperature condition, generally when the vehicle is not started for a long time (for example, after a night stop), or during a warm-up process, the exhaust temperature of the engine is generally low, and the catalyst has a relatively low reaction efficiency, so that the subsequent exhaust gas treatment equipment cannot work normally. Therefore, in order to enable the catalyst to work efficiently as soon as possible and enable subsequent tail gas treatment equipment to work normally as soon as possible, the catalyst needs to be subjected to heat management at the moment, and the exhaust temperature of the engine is increased as soon as possible.
The currently adopted methods for increasing the exhaust temperature of the engine include adjusting an excess air coefficient, adjusting an ignition advance angle, increasing an idle speed of the engine, and the like, but these methods can increase the exhaust temperature of the engine, but may also have adverse effects on subsequent processing equipment, for example, when the exhaust temperature of the engine is increased by adjusting the excess air coefficient, the air coefficient may be excessively adjusted due to improper operation, and then the post-processing equipment cannot normally work, so how to replace the conventional method with a more advanced technology, and under the condition that the normal work of the post-processing equipment is not affected, achieving rapid increase of the exhaust temperature of the engine becomes a problem to be solved urgently.
Based on the above, the application provides a method and a device for increasing the exhaust temperature of an engine, which are used for realizing uneven distribution of the injection amount of each injection valve by designing an injection scheduling strategy on the premise of ensuring that the total injection amount of each working cycle is not changed, so as to realize quick increase of the exhaust temperature.
The method for increasing the exhaust temperature of the engine provided by the embodiment of the present application will be described in detail below with reference to the accompanying drawings. Referring to fig. 1, which shows a flowchart of a method for increasing an exhaust temperature of an engine according to an embodiment of the present application, the embodiment may include the following steps:
s101: the total number of injection valves included in the target engine is acquired.
In this embodiment, in order to realize the quick promotion of engine exhaust temperature to follow-up tail gas treatment equipment can normally work as soon as possible. First, it is necessary to acquire the total number of injection valves included in the target engine.
In an alternative implementation manner, the target engine in the present embodiment refers to a single-point injection natural gas engine, that is, a natural gas engine in which an injection valve injects in an intake manifold.
The total number of the injection valves included in the target engine refers to the total number of the injection valves included in the target engine, for example, for a four-cylinder engine, the total number of the injection valves included in the target engine is 4, that is, the four-cylinder engine includes 4 injection valves in total.
S102: the target engine includes a first preset number of injection valves that are closed.
In the present embodiment, after the total number of injection valves included in the target engine is acquired through step S101, a first preset number of injection valves included in the target engine may be further closed, where the first preset number is smaller than the total number of injection valves included in the target engine. Taking the target engine as a four-cylinder engine as an example, the first preset number should be less than the total number 4 of injection valves included in the target engine, and the first preset number may be 1, 2, or 3.
Specifically, since the target engine is operating normally, the injection amount of each cylinder per one operation cycle is averaged. At this moment, on the premise that the total injection quantity of each cylinder in each working cycle is ensured to be unchanged and no fire occurs, if the injection quantity of some cylinders is properly reduced and the injection quantity of some cylinders is increased in a certain mode, the mixing condition of each cylinder can be changed, so that combustion is influenced, and the exhaust temperature of the target engine can be changed. In addition, since the injection valve is a pulse injection, the mixture of the air and the natural gas in the intake pipe also changes rich and lean, but the amount of the fuel gas evenly distributed to each cylinder is equal when the target engine is operating normally.
Therefore, by using the above characteristics, on the premise of ensuring that the total injection amount per working cycle is not changed, that is, the excess air factor (that is, the ratio of the actual air amount supplied for fuel combustion to the theoretical air amount) is not changed, an injection scheduling strategy can be designed, when the subsequent three-way catalyst has a heating request, that is, when the rapid temperature rise of the engine needs to be realized, the first preset number of injection valves included in the target engine can be closed, that is, the uneven distribution of the gas amount of each cylinder can be realized, and the rapid temperature rise of the target engine can be realized through the subsequent steps S103 to S106.
S103: a preset injection quantity of a first preset number of injection valves is acquired.
In the present embodiment, after the first preset number of injection valves included in the target engine are closed in step S102, the preset injection amount of the first preset number of injection valves is acquired for performing the subsequent step S104.
S104: the preset injection amount is divided equally according to a second preset number to obtain the average injection amount; wherein the sum of the second preset number and the first preset number is the total number of injection valves included in the target engine.
In this embodiment, after the preset injection amounts of the first preset number of injection valves are obtained in step S103, the preset injection amounts may be further equally divided according to the second preset number to obtain the average injection amounts. Wherein the sum of the second preset number and the first preset number is the total number of injection valves included in the target engine.
For example, the following steps are carried out: assuming that the target engine is a four-cylinder engine including a total number of injection valves of 4 and the first preset number is 1, the second preset number is 3. After the preset injection amount of 1 injection valve is obtained, the preset injection amount may be trisected to obtain an average injection amount.
S105: and respectively increasing the average injection quantity of the injection valves with the second preset number included in the target engine to obtain the increased injection quantities corresponding to the injection valves with the second preset number.
In this embodiment, after obtaining the average injection amount through step S104, in order to ensure that the total injection amount per working cycle is not changed, it is further required to increase the injection amounts of the second preset number of injection valves included in the target engine by the average injection amount, respectively, so that the average injection amounts are increased by the respective injection amounts of the second preset number of injection valves, that is, the injection amounts of the closed first preset number of injection valves are equalized to the other second preset number of injection valves that are not closed, so as to ensure that the total injection amount per working cycle is not changed, that is, the excess air ratio is not changed.
S106: and shifting the injection positions of a second preset number of injection valves according to a preset crank angle of one working cycle, and sequentially injecting the increased injection quantities at the shifted injection positions so as to quickly raise the exhaust temperature of the target engine.
In this embodiment, after the increased injection quantities corresponding to the second preset number of injection valves are obtained in step S105, the injection positions of the second preset number of injection valves may be further shifted according to a preset crank angle of one working cycle, and the increased injection quantities may be sequentially injected at the shifted injection positions, so as to rapidly increase the exhaust temperature of the target engine.
In this, an alternative implementation is that when the target engine is a four-cylinder engine, the crank angle of one working cycle is 720 °.
On this basis, if the first preset number is 1 and the second preset number is 3, the specific implementation process of step S106 includes: shifting the injection positions of the second preset number of injection valves by 60 degrees respectively according to the increased injection quantity and a preset working cycle crank angle, and sequentially injecting the second preset number of injection valves at the shifted injection positions so as to rapidly raise the exhaust temperature of the target engine.
In this implementation, when one working cycle crank angle is 720 ° and 1 injection valve is closed, and the injection quantity of the closed 1 injection valve is compensated by the other 3 injection valves, the injection quantity of each injection valve needs to be increased by one third. In addition, in order to distribute the three injections evenly within 720 °, it is necessary to shift the injection positions of the three injections by one, shift each injection position backwards by 60 ° in sequence, and sequence the three injection valves, where the injection valve 4 is the closed injection valve, and the injection valves 1, 2, and 3 are the remaining 3 injection valves, as shown in fig. 2, to compensate the injection amount of the closed injection valve 4.
Further, in some possible implementation manners of the embodiment of the present application, after the exhaust temperature of the target engine is rapidly raised through the step S106, the embodiment may further perform the following steps a-B:
step A: when the target engine exhaust temperature reaches a preset temperature, a first preset number of injection valves that are closed in the target engine are opened.
In this implementation manner, when the exhaust temperature of the target engine is rapidly raised in step S106 to reach the preset temperature, that is, after the catalyst is heated, the operation mode for raising the exhaust temperature of the target engine is exited, and the injection valves of the first preset number that are closed in the target engine are opened, so that the injection execution sequence during normal operation is switched again in the subsequent step B.
And B: all the injection valves included in the control target engine perform sequential injection at the pre-offset positions in accordance with preset normal injection amounts, respectively.
After the first preset number of injection valves closed in the target engine are opened through step a, it is further possible to control all the injection valves included in the target engine to perform sequential injections at positions before respective shifts, respectively, in accordance with a preset normal injection quantity, that is, an injection quantity before increasing the average injection quantity.
For example, assuming that the target engine is a four-cylinder engine, when the exhaust temperature of the target engine is raised to a preset temperature, that is, when no catalyst heating request is made, the crank angle of one working cycle is 720 °, and the interval angle between the top dead centers (that is, the top dead center of the compression stroke) of every two adjacent ignition cylinders is 180 °, assuming that the top dead center of 1 cylinder (that is, the injection valve 1) is 0 ° and the injection advance angle is 0 °, the injection advance angles of the other three cylinders (that is, the injection valves 2, 3 and 4) relative to 1 cylinder (that is, the injection valve 1) are 180 °, 360 ° and 540 °, respectively, and then the injection valves 1 ~ 4 can be sequentially corresponding to the cylinders according to the ignition sequence, and a specific normal injection sequence is shown in fig. 3.
In this way, in the method for increasing the exhaust temperature of the engine provided by the present application, first, the total number of the injection valves included in the target engine is obtained, then, the first preset number of the injection valves is closed, meanwhile, the preset injection amount of the first preset number of the injection valves is obtained, then, the preset injection amount is divided equally according to the second preset number, so as to obtain an average injection amount, wherein the sum of the second preset number and the first preset number is the total number of the injection valves included in the target engine, then, the injection amounts of the second preset number of the injection valves are respectively increased by the average injection amount, and further, the injection positions of the second preset number of the injection valves can be shifted according to a preset crank angle of one working cycle, and the increased injection amounts are sequentially injected at the shifted injection positions, so as to rapidly increase the exhaust temperature of the target engine. It can be seen that in the present embodiment, the injection amount of the first preset number of injection valves in the target engine is reduced, and the injection amount of the second preset number of injection valves is increased, so that the mixing condition of each injection valve can be changed to affect combustion to change the exhaust temperature, and therefore, on the premise of ensuring that the total injection amount of each working cycle is not changed, the injection amount of each injection valve is redistributed by designing an injection scheduling strategy, the injection position, the sequence and the injection amount of each injection valve are adjusted, and further, the exhaust temperature is rapidly increased.
The above embodiments describe the technical solutions of the methods of the present application in detail, and accordingly, the present application further provides a device for controlling the temperature of the engine exhaust, which is described below.
Referring to fig. 4, fig. 4 is a structural diagram of a device for raising exhaust temperature of an engine according to an embodiment of the present application, and as shown in fig. 4, the device includes:
a first acquisition unit 401 for acquiring the total number of injection valves included in the target engine;
a closing unit 402 for closing a first preset number of injection valves included in the target engine; the first preset number is less than a total number of injection valves included in the target engine;
a second acquisition unit 403 for acquiring the preset injection amounts of the first preset number of injection valves;
an averaging unit 404, configured to average the preset injection amount according to a second preset number, so as to obtain an averaged injection amount; the sum of the second preset number and the first preset number is the total number of injection valves included in the target engine;
an increasing unit 405, configured to increase the injection quantities of the second preset number of injection valves included in the target engine by the average injection quantity, respectively, to obtain increased injection quantities corresponding to the second preset number of injection valves, respectively;
and the injection unit 406 is used for offsetting the injection positions of the second preset number of injection valves according to a preset working cycle crank angle, and sequentially injecting the increased injection quantities at the offset injection positions so as to quickly raise the exhaust temperature of the target engine.
Optionally, the target engine is a single-injection natural gas engine.
Alternatively, if the target engine includes 4 total injection valves, the preset one-cycle crank angle is 720 degrees.
Optionally, if the first preset number is 1, the second preset number is 3,
correspondingly, the spraying unit 406 is specifically configured to:
shifting the injection positions of the second preset number of injection valves by 60 degrees respectively according to the increased injection quantity and a preset working cycle crank angle, and performing sequential injection on the second preset number of injection valves at the shifted injection positions so as to rapidly increase the exhaust temperature of the target engine.
Optionally, the apparatus further comprises:
the starting unit is used for starting a first preset number of closed injection valves in the target engine when the target engine exhaust temperature reaches a preset temperature;
and the control unit is used for controlling all injection valves contained in the target engine to perform sequential injection at the positions before deviation according to preset normal injection quantity.
In this way, in the device for raising the exhaust temperature of the engine provided by the present application, first, the total number of the injection valves included in the target engine is obtained, then, the first preset number of the injection valves is closed, and meanwhile, the preset injection amount of the first preset number of the injection valves is obtained, then, the preset injection amount is divided equally according to the second preset number, so as to obtain the average injection amount, wherein the sum of the second preset number and the first preset number is the total number of the injection valves included in the target engine, and then, the injection amounts of the second preset number of the injection valves are respectively increased by the average injection amount, so that the injection positions of the second preset number of the injection valves can be shifted according to a preset crank angle of one working cycle, and the increased injection amounts are sequentially injected at the shifted injection positions, so as to rapidly raise the exhaust temperature of the target engine. It can be seen that in the present embodiment, the injection amount of the first preset number of injection valves in the target engine is reduced, and the injection amount of the second preset number of injection valves is increased, so that the mixing condition of each injection valve can be changed to affect combustion to change the exhaust temperature, and therefore, on the premise of ensuring that the total injection amount of each working cycle is not changed, the injection amount of each injection valve is redistributed by designing an injection scheduling strategy, the injection position, the sequence and the injection amount of each injection valve are adjusted, and further, the exhaust temperature is rapidly increased.
It should be noted that, in the present specification, the embodiments are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments may be referred to each other. For the system or the device disclosed by the embodiment, the description is simple because the system or the device corresponds to the method disclosed by the embodiment, and the relevant points can be referred to the method part for description.
It is further noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.
The steps of a method or algorithm described in connection with the embodiments disclosed herein may be embodied directly in hardware, in a software module executed by a processor, or in a combination of the two. A software module may reside in Random Access Memory (RAM), memory, Read Only Memory (ROM), electrically programmable ROM, electrically erasable programmable ROM, registers, hard disk, a removable disk, a CD-ROM, or any other form of storage medium known in the art.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to 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 (10)
1. A method of increasing exhaust temperature of an engine, the method comprising:
acquiring the total number of injection valves contained in a target engine;
closing a first preset number of injection valves comprised by the target engine; the first preset number is less than a total number of injection valves included in the target engine;
acquiring the preset injection quantity of the injection valves with the first preset number;
equally dividing the preset injection quantity according to a second preset number to obtain an average injection quantity; the sum of the second preset number and the first preset number is the total number of injection valves included in the target engine;
respectively increasing the average injection quantity of the injection quantities of the second preset number of injection valves included in the target engine to obtain increased injection quantities corresponding to the second preset number of injection valves;
shifting the injection positions of the second preset number of injection valves according to a preset one-working-cycle crank angle, and sequentially injecting the increased injection quantities at the shifted injection positions so as to rapidly raise the exhaust temperature of the target engine.
2. The method of claim 1, wherein the target engine is a single-injection natural gas engine.
3. The method of claim 1 wherein said target engine includes a total number of injection valves of 4 and correspondingly said predetermined one operating cycle crank angle is 720 degrees.
4. The method of claim 3, wherein if the first predetermined number is 1, then the second predetermined number is 3,
correspondingly, the shifting the injection positions of the second preset number of injection valves according to a preset one-duty-cycle crank angle and sequentially injecting the increased injection quantities at the shifted injection positions so as to rapidly raise the exhaust temperature of the target engine includes:
shifting the injection positions of the second preset number of injection valves by 60 degrees respectively according to the increased injection quantity and a preset working cycle crank angle, and performing sequential injection on the second preset number of injection valves at the shifted injection positions so as to rapidly increase the exhaust temperature of the target engine.
5. The method according to any one of claims 1 to 4, wherein said shifting injection positions of said second predetermined number of injection valves according to a predetermined one-cycle crank angle and sequentially injecting said increased injection quantities at the shifted injection positions so as to rapidly raise the exhaust temperature of the target engine, further comprises:
when the target engine exhaust temperature reaches a preset temperature, opening a first preset number of injection valves which are closed in the target engine;
and controlling all injection valves contained in the target engine to perform sequential injection at the positions before the deviation according to preset normal injection quantity.
6. An engine exhaust temperature raising apparatus, comprising:
a first acquisition unit configured to acquire a total number of injection valves included in a target engine;
a closing unit for closing a first preset number of injection valves included in the target engine; the first preset number is less than a total number of injection valves included in the target engine;
a second acquisition unit configured to acquire a preset injection amount of the first preset number of injection valves;
the equalizing unit is used for equalizing the preset injection amount according to a second preset number to obtain an equalized injection amount; the sum of the second preset number and the first preset number is the total number of injection valves included in the target engine;
an increasing unit configured to increase the injection quantities of the second preset number of injection valves included in the target engine by the average injection quantity, respectively, to obtain increased injection quantities corresponding to the second preset number of injection valves, respectively;
and the injection unit is used for offsetting the injection positions of the second preset number of injection valves according to a preset working cycle crank angle and sequentially injecting the increased injection quantities at the offset injection positions so as to quickly improve the exhaust temperature of the target engine.
7. The apparatus of claim 6, wherein the target engine is a single-point injection natural gas engine.
8. The apparatus of claim 6 wherein said target engine includes a total number of injection valves of 4 and correspondingly said predetermined one operating cycle crank angle is 720 degrees.
9. The apparatus of claim 8, wherein the first predetermined number is 1, and the second predetermined number is 3,
correspondingly, the injection unit is specifically configured to:
shifting the injection positions of the second preset number of injection valves by 60 degrees respectively according to the increased injection quantity and a preset working cycle crank angle, and performing sequential injection on the second preset number of injection valves at the shifted injection positions so as to rapidly increase the exhaust temperature of the target engine.
10. The apparatus of any one of claims 6 to 9, further comprising:
the starting unit is used for starting a first preset number of closed injection valves in the target engine when the target engine exhaust temperature reaches a preset temperature;
and the control unit is used for controlling all injection valves contained in the target engine to perform sequential injection at the positions before deviation according to preset normal injection quantity.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910733611.XA CN110230548B (en) | 2019-08-09 | 2019-08-09 | Method and device for improving exhaust temperature of engine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910733611.XA CN110230548B (en) | 2019-08-09 | 2019-08-09 | Method and device for improving exhaust temperature of engine |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN110230548A CN110230548A (en) | 2019-09-13 |
| CN110230548B true CN110230548B (en) | 2020-01-03 |
Family
ID=67855265
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201910733611.XA Active CN110230548B (en) | 2019-08-09 | 2019-08-09 | Method and device for improving exhaust temperature of engine |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN110230548B (en) |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20150117162A (en) * | 2014-04-09 | 2015-10-19 | 현대자동차주식회사 | Method for compensating post injectiion timing |
| CN108561233A (en) * | 2018-03-14 | 2018-09-21 | 江苏科技大学 | A kind of diesel/natural gas dual-fuel engine emission control strategy |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP3052856B2 (en) * | 1996-10-24 | 2000-06-19 | 三菱自動車工業株式会社 | Exhaust heating device |
| JP2008202483A (en) * | 2007-02-20 | 2008-09-04 | Hitachi Ltd | Cylinder injection type internal combustion engine and injector used therefor |
| CA2702246C (en) * | 2010-04-20 | 2012-01-17 | Westport Power Inc. | Method of controlling a direct-injection gaseous-fuelled internal combustion engine system with a selective catalytic reduction converter |
-
2019
- 2019-08-09 CN CN201910733611.XA patent/CN110230548B/en active Active
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20150117162A (en) * | 2014-04-09 | 2015-10-19 | 현대자동차주식회사 | Method for compensating post injectiion timing |
| CN108561233A (en) * | 2018-03-14 | 2018-09-21 | 江苏科技大学 | A kind of diesel/natural gas dual-fuel engine emission control strategy |
Also Published As
| Publication number | Publication date |
|---|---|
| CN110230548A (en) | 2019-09-13 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US9879625B2 (en) | Variable displacement engine control system and method | |
| US8272361B2 (en) | Method for cylinder synchronization of an internal combustion engine | |
| RU2349783C1 (en) | Control device for internal combustion engine | |
| JP4005941B2 (en) | Combustion control device and combustion control method for in-cylinder injection engine | |
| US9903307B2 (en) | Method of fuel injection control | |
| CN104100396B (en) | Method and system for engine control | |
| RU2667537C2 (en) | Method for engine (versions) | |
| RU2350776C1 (en) | Ice control device | |
| JP2004132191A (en) | Control device for spark ignition type engine | |
| JP2001098985A (en) | Device and method for controlling fuel for spark- ingnited direct injection engine | |
| WO2015001728A1 (en) | Direct injection engine controlling device | |
| JP2006258007A (en) | Control device for internal combustion engine | |
| JP4470773B2 (en) | Control device for internal combustion engine | |
| Salber et al. | Synergies of variable valve actuation and direct injection | |
| JP2012255366A (en) | Control device and control method for internal combustion engine | |
| US20160326978A1 (en) | Method for controlling an internal combustion engine | |
| JP5056966B2 (en) | Combustion control device | |
| CN110230548B (en) | Method and device for improving exhaust temperature of engine | |
| US7047945B2 (en) | Start-up control of in-cylinder fuel injection internal combustion engine | |
| CN101328840B (en) | An internal combustion engine system, and a method in such an engine system | |
| JP6406398B2 (en) | In-cylinder injection engine control device | |
| JP5896292B2 (en) | Operation control device for internal combustion engine | |
| JP2016205337A (en) | Control device of internal combustion engine | |
| JP2001241345A (en) | Fuel control device for diesel engine | |
| CN110023609B (en) | Method for controlling injection in diesel engine |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |