CN112780466A - High-power marine diesel engine main pipe flow-dividing control multipoint air supplementing device and air supplementing method - Google Patents

High-power marine diesel engine main pipe flow-dividing control multipoint air supplementing device and air supplementing method Download PDF

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Publication number
CN112780466A
CN112780466A CN202110239275.0A CN202110239275A CN112780466A CN 112780466 A CN112780466 A CN 112780466A CN 202110239275 A CN202110239275 A CN 202110239275A CN 112780466 A CN112780466 A CN 112780466A
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air
row
valve
diesel engine
supplementing
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CN112780466B (en
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杨立平
聂昊鹏
王立媛
尚秋成
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Harbin Engineering University
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Harbin Engineering University
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M61/00—Fuel-injectors not provided for in groups F02M39/00 - F02M57/00 or F02M67/00
    • F02M61/16—Details not provided for in, or of interest apart from, the apparatus of groups F02M61/02 - F02M61/14
    • F02M61/18—Injection nozzles, e.g. having valve seats; Details of valve member seated ends, not otherwise provided for
    • 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
    • F02B37/00—Engines characterised by provision of pumps driven at least for part of the time by exhaust
    • 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
    • F02B37/00—Engines characterised by provision of pumps driven at least for part of the time by exhaust
    • F02B37/12—Control of the pumps
    • F02B37/22—Control of the pumps by varying cross-section of exhaust passages or air passages, e.g. by throttling turbine inlets or outlets or by varying effective number of guide conduits
    • F02B37/225—Control of the pumps by varying cross-section of exhaust passages or air passages, e.g. by throttling turbine inlets or outlets or by varying effective number of guide conduits air passages
    • 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
    • F02B39/00—Component parts, details, or accessories relating to, driven charging or scavenging pumps, not provided for in groups F02B33/00 - F02B37/00
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M45/00—Fuel-injection apparatus characterised by having a cyclic delivery of specific time/pressure or time/quantity relationship
    • F02M45/02—Fuel-injection apparatus characterised by having a cyclic delivery of specific time/pressure or time/quantity relationship with each cyclic delivery being separated into two or more parts
    • F02M45/04—Fuel-injection apparatus characterised by having a cyclic delivery of specific time/pressure or time/quantity relationship with each cyclic delivery being separated into two or more parts with a small initial part, e.g. initial part for partial load and initial and main part for full load
    • F02M45/08—Injectors peculiar thereto
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M61/00—Fuel-injectors not provided for in groups F02M39/00 - F02M57/00 or F02M67/00
    • F02M61/04—Fuel-injectors not provided for in groups F02M39/00 - F02M57/00 or F02M67/00 having valves, e.g. having a plurality of valves in series
    • F02M61/10—Other injectors with elongated valve bodies, i.e. of needle-valve type
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M63/00—Other fuel-injection apparatus having pertinent characteristics not provided for in groups F02M39/00 - F02M57/00 or F02M67/00; Details, component parts, or accessories of fuel-injection apparatus, not provided for in, or of interest apart from, the apparatus of groups F02M39/00 - F02M61/00 or F02M67/00; Combination of fuel pump with other devices, e.g. lubricating oil pump
    • 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
    • Y02T10/12—Improving ICE efficiencies

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Supercharger (AREA)
  • Output Control And Ontrol Of Special Type Engine (AREA)

Abstract

The invention aims to provide a high-power marine diesel engine main pipe flow-dividing control multipoint air supplementing device and method. According to the invention, the air supply pipe is arranged on the air rail and connected with each air inlet channel, so that air can be supplied to each air cylinder independently, the problem that the delay difference of air entering each cylinder is large due to air supply of the main pipe can be avoided, the running state of the engine is monitored in real time, the opening and closing time of air supply and the air supply amount are further judged, and the requirements on quick air response and air supply amount are realized.

Description

High-power marine diesel engine main pipe flow-dividing control multipoint air supplementing device and air supplementing method
Technical Field
The invention relates to a diesel engine, in particular to an air inlet and outlet device of a marine diesel engine and a control method.
Background
With the large-scale development of ships, the high-power V-type supercharged diesel engine is widely applied, but the large-scale diesel engine adopting the unipolar supercharging often meets some problems in practical use and needs to be solved urgently, wherein insufficient torque under low working conditions is one of the most main problems. In order to improve the performance of the high-power V-shaped supercharged diesel engine under all working conditions, the problem of insufficient torque under low working conditions is solved by adopting a sequential supercharging technology. The basic principle of the sequential supercharging technology is as follows: the supercharged diesel engine adopts a plurality of superchargers, and the superchargers are successively put into use along with the continuous improvement of the rotating speed and the load, so that the diesel engine has higher supercharging ratio and better economy in the whole operation area. When the diesel engine is used for supercharger switching, the air valve is opened later than the exhaust gas valve, so that the air inlet response is slow in the switching process, and the air inlet amount is obviously insufficient. In addition, when the diesel engine is accelerated or loaded, the fuel injection quantity can be suddenly increased, and the air intake quantity is obviously insufficient in the transient process due to slow air intake response, so that the combustion and the emission are deteriorated. Aiming at the problems of slow air intake response and insufficient air intake amount in the transient process of a high-power V-shaped sequential supercharged diesel engine, an air supplementing device is required to be installed on the diesel engine to supplement air in time. Because the size of the high-power marine diesel engine is large, the direct air supplement on the air inlet main pipe can cause large air supplement delay difference and uneven air supplement amount when air enters each air cylinder.
The research on the air supplement device of the V-shaped sequential supercharged diesel engine at the present stage still has obvious defects. Patent CN 203035338U invented a sequential supercharging structure with air-supplementing function, which only connects a high-pressure compressed air source with a communicating pipe connecting two air inlet main pipes, so that the stroke of supplementing air to each cylinder is long, which easily causes air-supplementing energy loss, and the paths of air entering two rows of cylinders are different, which makes air-supplementing uniformity difficult to guarantee. Patent CN 103790694 a invented a sequential supercharged diesel engine air-entrapping system and method, which utilizes an air-entrapping device to inject air to a volute of a basic air compressor and an exhaust pipe on the other side, respectively, to increase the air-in amount of a diesel engine in a switching process, but the method has a slow air-entrapping response due to the long distance between the air-entrapping position and the cylinder, and cannot realize rapid air-entrapping.
Disclosure of Invention
The invention aims to provide a main pipe flow-dividing control multipoint air supplementing device and an air supplementing method for a high-power marine diesel engine, which can solve the problems of slow air intake response and insufficient air intake amount in the transient process of a sequential supercharged diesel engine, and the problems of uneven air supplementing, large energy loss and the like caused by air supplementing of an air intake main pipe.
The purpose of the invention is realized as follows:
the invention relates to a high-power marine diesel engine main pipe flow-dividing control multipoint air supply device, which is characterized in that: the system comprises a basic turbocharger, a controlled turbocharger, an A row of cylinders, a B row of cylinders and a high-pressure compressed air source, wherein the air compressor of the basic turbocharger is connected with an A row of air rails through an A row of air inlet main pipe, the A row of air rails is connected with the A row of cylinders, the turbine of the basic turbocharger is connected with the A row of cylinders through an A row of exhaust main pipe, the air compressor of the controlled turbocharger is connected with a B row of air rails through a B row of air inlet main pipe, the B row of air rails is connected with the B row of cylinders, the turbine of the controlled turbocharger is connected with the B row of cylinders through a B row of exhaust main pipe, the high-pressure compressed air source is connected with an air supplementing bifurcated pipe through an air supplementing intercooler, a first branch of the air supplementing bifurcated pipe is connected with the A row of air rails through a first air supplementing injection valve, a second branch of the air supplementing bifurcated pipe is connected with the B row, a waste gas valve is arranged between a turbine of the controlled turbocharger and the exhaust communicating pipe, an air valve is arranged on the B-row air inlet main pipe, a main air supplementing valve is arranged between the high-pressure compressed air source and the air supplementing intercooler, and the main air supplementing valve, the first air supplementing injection valve, the second air supplementing injection valve, the waste gas valve and the air valve are respectively connected with the control unit.
The invention relates to a flow-dividing control multipoint air supply device for a main pipe of a high-power marine diesel engine, which also comprises:
1. the air rail of the row A is connected with the air supply pipe of the row A, the air supply pipe of the row A extends into the corresponding air inlet manifold of the row A to be in front of the valve, the end part of the air supply pipe of the row A is provided with a high-pressure nozzle, the air rail of the row B is connected with the air supply pipe of the row B, the air supply pipe of the row B extends into the corresponding air inlet manifold of the row B to be in front of the valve, and the end part of the air supply pipe of the row B is provided with a high.
2. The volume of the air rail in the row A and the air rail in the row B is 100-105 times of the single air injection amount of the cylinder.
The invention relates to a method for shunting and controlling multipoint air supplement for a main pipe of a high-power marine diesel engine, which is characterized by comprising the following steps of: during the operation of the sequential supercharged diesel engine, the crankshaft speed sensor detects the speed of the diesel engine in real time, and calculates the speed change rate delta n for measuring the speed change in real time in the control unit, and the control unit sets the critical speed change rate n when the load of the diesel engine suddenly increases1When detecting that Δ n is greater than or equal to n1When the diesel engine is in the transient process of sudden acceleration loading, the main air supplement valve is opened to supplement air for the diesel engine; if Δ n is less than n1Detecting the state of the waste gas valve, if detecting that the waste gas valve is suddenly opened when being closed, switching the supercharger by the diesel engine, and opening the main air supply valve to supply air at the moment; if neither of Δ n > n is satisfied1If the condition that the waste gas valve is closed to be opened is not met, the engine does not need to supplement gas, the step of detecting the rotating speed of the crankshaft is continued, and if one condition is met, the main gas supplementing valve is opened to operate the gas supplementing device; after a main air supplement valve is opened, the air inlet pressure of two rows of air inlet main pipes is detected, the actual air inlet amount of two rows of air cylinders is respectively judged by a speed density method, the oil injection amount required by each row of air cylinders is determined according to the change rate delta n of the rotating speed, the theoretical air amount required by each row of air cylinders is determined according to the target air-fuel ratio, the theoretical air amount is reduced by the actual air inlet amount to determine the supplemented air amount, the injection pulse width of two air supplement injection valves is determined according to the flow characteristic of the air supplement injection valves, the air supplement injection valves on two sides are opened after the injection pulse width is set, and high-pressure air entersThe pipe respectively supplements air to each cylinder, then closes the air supplement injection valves at two sides according to the set injection pulse width, then closes the main air supplement valve, and the air supplement device stops working temporarily; and judging whether the engine stops running or not, if the engine continues running, monitoring the rotating speed of the crankshaft again, and if the engine stops working, ending the control flow.
The invention has the advantages that: the invention adopts the flow-dividing control V-shaped diesel engine to supplement air for two rows of cylinders, and the two sides of the air-supply device are respectively provided with the air rails connected to the air inlet channels of the cylinders, and the volume of the air rails is more than 100 times of the single air injection amount of each cylinder, thereby ensuring that the air supplement processes of the cylinders are not interfered with each other. The air supply pipe is arranged on the air rail and connected with each air inlet channel, air can be supplied to each air cylinder independently, and the problem that the delay difference of air entering each cylinder is large due to air supply of the main pipe can be avoided. In addition, the air supply device is matched with the control system, the running state of the engine can be monitored in real time by acquiring the rotating speed of the diesel engine, the state of the waste gas valve and the pressure signal of the air inlet main pipe, so that the opening and closing time of air supply and the air supply amount are judged, and the requirements on quick air response and air supply amount are met.
Drawings
FIG. 1 is a schematic structural view of the present invention;
FIG. 2 is a diagram showing the positional relationship between the air supply pipe and a cylinder;
FIG. 3 is a cross-sectional view of the high pressure nozzle;
fig. 4 is a flow chart of air supply control.
Detailed Description
The invention will now be described in more detail by way of example with reference to the accompanying drawings in which:
referring to fig. 1-4, fig. 1 is a general structure diagram of a high-power V-type diesel engine with an air make-up device. The high-power V-shaped diesel engine adopts a sequential supercharging technology and basically comprises an A-row exhaust manifold 2, a basic turbocharger 3 and an A-row intake manifold 4 which are arranged on one side of an A-row cylinder 1; the cylinder side of the row B10 comprises a row B intake manifold 5, an air valve 6, a controlled turbocharger 7, an exhaust gas valve 8 and a row B exhaust manifold 9; and an intercooler 11 is installed at the junction of the two intake manifolds. The air supplementing device comprises a control unit 18, a high-pressure compressed air source 12, a main air supplementing pipe 14, a main air supplementing valve 13 and an air supplementing intercooler 15, and is connected with an air supplementing bifurcated pipe 16, air supplementing injection valves 17 are respectively arranged on two sides of the bifurcated pipe, and air rails 19 are respectively arranged at the tail end of the bifurcated pipe; the volume of the air rail is more than 100 times of the single injection amount, so that the air rail is ensured to have no pressure fluctuation when each cylinder injects air, and the problems of fluctuation of the circulation air supplement amount of each cylinder and interference of each cylinder in the air injection process are avoided.
The basic turbocharger is connected with the cylinder of the A row, and the controlled turbocharger is connected with the cylinder of the B row. The air is stored in a high-pressure compressed air source, an air source outlet is connected with one end of an air supply main pipe, a main air supply valve for controlling the opening and closing of an air supply device is arranged on the main pipe, an air supply intercooler is arranged at the tail end of the air supply main pipe, the other side of the intercooler is connected with an air supply bifurcated pipe, air valves are arranged on two sides of the bifurcated pipe and are respectively connected with air rails on two sides, and air supply pipes with the same number as that of cylinders are arranged on the air rails and are respectively connected with. The air supplementing pipe is bent to penetrate into the air inlet channel, a high-pressure nozzle is arranged at the tail end of the air supplementing pipe, and the nozzle of the nozzle is aligned with the air inlet valve. Sensors are arranged at all positions of the engine, wherein sensors for detecting pressure are arranged in the air inlet main pipes on the two sides of the V-shaped diesel engine and are used for detecting the air inlet flow; a crankshaft rotation angle sensor and a top dead center sensor for detecting the rotation speed and the phase position are arranged on the crankshaft of the engine; and a sensor for detecting the open/close state of the waste gas valve is installed on the waste gas valve. The running state of the engine is fed back to the control system by the sensor in real time, and the control system controls the specific running mode of the air supplement device after judgment. The high-power marine diesel engine main pipe shunting control multipoint air supplement unit is mainly characterized in that: the air supplement device can detect the running state of the engine in real time, and when the air intake response of the engine is slow and the air intake amount is insufficient in the dynamic process, high-pressure air can be rapidly injected to each cylinder by controlling the cut-in of the air supplement device, so that the requirements of the engine on the air amount and the air intake rapid response are met.
The device adopts the air make-up of two cylinders of reposition of redundant personnel control. The air is respectively guided to the air rails on the two sides through the air supplementing bifurcated pipe so as to be supplemented with air according to the air supplementing amount required by each row of cylinders.
The high pressure air enters the air rail 19 and is introduced into the air inlet channels through the air supply pipes 20 on the air rail 19. The air pressure can be stabilized by introducing high-pressure air into the air rail 19, and multi-point air supply can be realized by the air supply pipes 20.
Each of the supply ducts 20 in the air rail 19 is curved into the intake duct and is provided with a high-pressure nozzle 21 at the end. The nozzle is short in length and can eject air jet at high speed by adopting the design that the pipe diameter is gradually reduced. And the nozzle outlet is close to the cylinder and aims at the intake valve, so that the air jet directly passes through the gap between the intake valve and the valve seat to directly enter the cylinder, the rapid air intake is realized, and the energy loss of the jet flow is avoided.
The device adopts an electric control system, and the running state of the engine is judged in real time according to signals of the state of the waste gas valve, the rotating speed of the diesel engine, the air inlet main pipe and the like, so that the cut-in position of the air supplementing device and the air quantity in the air supplementing process are controlled.
Fig. 2 and 3 are a positional relationship diagram of the air supply pipe and one cylinder and a sectional view of the high-pressure nozzle, respectively. The air rail is provided with air supply pipes 20 with the number equal to that of the air cylinders, the air supply pipes are bent to penetrate into the air inlet channel, and the tail ends of the air supply pipes are provided with high-pressure nozzles 21. The high-pressure nozzle is short in length and adopts a smooth transition design with the inner diameter from large to small, so that the jet flow can be rapidly ejected at high pressure. The outlet of the nozzle is aligned with the inlet valve, and the high-pressure jet flow can quickly penetrate through a gap between the inlet valve and the valve seat to enter the cylinder, so that the energy loss in the air supplementing process is avoided.
FIG. 4 is a flow chart of the control of the gas supply device. The invention also introduces a method for shunting and controlling multi-point air supply of the main pipe of the high-power marine diesel engine. The specific control flow of the method is as follows: during the operation of the high-power V-shaped sequential supercharged diesel engine, the crankshaft rotation speed sensor detects the rotation speed of the engine in real time, the rotation speed change rate delta n for measuring the rotation speed change speed is calculated in real time in the control unit, and the critical rotation speed change rate n during sudden load increase of the diesel engine is set in the control unit according to experience1When detecting that Δ n is greater than n1When the diesel engine is in the transient process of sudden acceleration loading, the diesel engine is started at the momentA main air supplement valve for supplementing air to the diesel engine; if Δ n is less than n1If the exhaust valve is suddenly opened when being closed, the diesel engine is switched to the supercharger, and at the moment, the main air supply valve is also opened to supply air; if neither of Δ n > n is satisfied1If the condition that the waste gas valve is closed to be opened is not met, the engine does not need to supplement gas, the step of detecting the rotating speed of the crankshaft is continued, and if one condition is met, the main gas supplementing valve needs to be opened to operate the gas supplementing device. After a main air supplement valve is opened, the air inlet pressure of two rows of air inlet main pipes needs to be detected, the actual air inlet amount of two rows of air cylinders is respectively judged through a speed density method, then the oil injection amount required by each row of air cylinders is determined according to the change rate delta n of the rotating speed, the theoretical air amount required by each row of air cylinders is determined according to the target air-fuel ratio, the theoretical air amount is reduced by the actual air inlet amount to determine the supplemented air amount, and finally the injection pulse width of two air supplement injection valves is determined according to the flow characteristic of the air supplement injection valves. After the injection pulse width is set, the air supply injection valves on the two sides can be opened, high-pressure air enters the air rail and supplies air to the cylinders through the air supply pipes respectively, then the air supply injection valves on the two sides are closed according to the set injection pulse width, the main air supply valve is closed, and the air supply device stops working temporarily. At the moment, whether the engine stops running needs to be judged, if the engine continues running, the first step needs to be returned to monitor the rotating speed of the crankshaft again, and if the engine stops working, the control flow is ended.

Claims (4)

1. The utility model provides a high-power marine diesel engine house steward reposition of redundant personnel control multiple spot air supplement unit which characterized by: the system comprises a basic turbocharger, a controlled turbocharger, an A row of cylinders, a B row of cylinders and a high-pressure compressed air source, wherein the air compressor of the basic turbocharger is connected with an A row of air rails through an A row of air inlet main pipe, the A row of air rails is connected with the A row of cylinders, the turbine of the basic turbocharger is connected with the A row of cylinders through an A row of exhaust main pipe, the air compressor of the controlled turbocharger is connected with a B row of air rails through a B row of air inlet main pipe, the B row of air rails is connected with the B row of cylinders, the turbine of the controlled turbocharger is connected with the B row of cylinders through a B row of exhaust main pipe, the high-pressure compressed air source is connected with an air supplementing bifurcated pipe through an air supplementing intercooler, a first branch of the air supplementing bifurcated pipe is connected with the A row of air rails through a first air supplementing injection valve, a second branch of the air supplementing bifurcated pipe is connected with the B row, a waste gas valve is arranged between a turbine of the controlled turbocharger and the exhaust communicating pipe, an air valve is arranged on the B-row air inlet main pipe, a main air supplementing valve is arranged between the high-pressure compressed air source and the air supplementing intercooler, and the main air supplementing valve, the first air supplementing injection valve, the second air supplementing injection valve, the waste gas valve and the air valve are respectively connected with the control unit.
2. The main pipe flow-dividing control multipoint air supply device of the high-power marine diesel engine as claimed in claim 1, wherein: the air rail of the row A is connected with the air supply pipe of the row A, the air supply pipe of the row A extends into the corresponding air inlet manifold of the row A to be in front of the valve, the end part of the air supply pipe of the row A is provided with a high-pressure nozzle, the air rail of the row B is connected with the air supply pipe of the row B, the air supply pipe of the row B extends into the corresponding air inlet manifold of the row B to be in front of the valve, and the end part of the air supply pipe of the row B is provided with a high.
3. The main pipe flow-dividing control multipoint air supply device of the high-power marine diesel engine as claimed in claim 2, wherein: the volume of the air rail in the row A and the air rail in the row B is 100-105 times of the single air injection amount of the cylinder.
4. A method for multi-point air supplement by main pipe flow division control of a high-power marine diesel engine is characterized by comprising the following steps: during the operation of the sequential supercharged diesel engine, the crankshaft speed sensor detects the speed of the diesel engine in real time, and calculates the speed change rate delta n for measuring the speed change in real time in the control unit, and the control unit sets the critical speed change rate n when the load of the diesel engine suddenly increases1When detecting that Δ n is greater than or equal to n1When the diesel engine is in the transient process of sudden acceleration loading, the main air supplement valve is opened to supplement air for the diesel engine; if Δ n is less than n1Detecting the state of the waste gas valve, if detecting that the waste gas valve is suddenly opened when being closed, the diesel engine switches the supercharger, and then the main gulp valve is opened to start gulpGas; if neither of Δ n > n is satisfied1If the condition that the waste gas valve is closed to be opened is not met, the engine does not need to supplement gas, the step of detecting the rotating speed of the crankshaft is continued, and if one condition is met, the main gas supplementing valve is opened to operate the gas supplementing device; after a main air supplement valve is opened, detecting the air inlet pressure of two rows of air inlet main pipes, respectively judging the actual air inlet amount of two rows of air cylinders by a speed density method, then determining the oil injection amount required by each row of air cylinders according to the change rate delta n of the rotating speed, then determining the theoretical air amount required by each row of air cylinders according to the target air-fuel ratio, subtracting the theoretical air amount from the actual air inlet amount to determine the supplemented air amount, finally determining the injection pulse width of two air supplement injection valves according to the flow characteristic of the air supplement injection valves, opening the air supplement injection valves on the two sides after the injection pulse width is set, enabling high-pressure air to enter an air rail and supplement air for each cylinder through an air supplement pipe, then closing the air supplement injection valves on the two sides according to the set injection pulse width, then closing; and judging whether the engine stops running or not, if the engine continues running, monitoring the rotating speed of the crankshaft again, and if the engine stops working, ending the control flow.
CN202110239275.0A 2021-03-04 2021-03-04 High-power marine diesel engine main pipe flow-dividing control multipoint air supplementing device and air supplementing method Active CN112780466B (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN114263542A (en) * 2021-12-31 2022-04-01 潍柴动力股份有限公司 Air control method

Citations (5)

* Cited by examiner, † Cited by third party
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