CN110454288B - Cylinder-breaking control method for reducing connecting, arranging and speed-reducing of ship propulsion main engine - Google Patents
Cylinder-breaking control method for reducing connecting, arranging and speed-reducing of ship propulsion main engine Download PDFInfo
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- CN110454288B CN110454288B CN201910644006.5A CN201910644006A CN110454288B CN 110454288 B CN110454288 B CN 110454288B CN 201910644006 A CN201910644006 A CN 201910644006A CN 110454288 B CN110454288 B CN 110454288B
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
- B63H—MARINE PROPULSION OR STEERING
- B63H21/00—Use of propulsion power plant or units on vessels
- B63H21/21—Control means for engine or transmission, specially adapted for use on marine vessels
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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
- F02D17/00—Controlling engines by cutting out individual cylinders; Rendering engines inoperative or idling
- F02D17/02—Cutting-out
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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
- F02D41/02—Circuit arrangements for generating control signals
- F02D41/04—Introducing corrections for particular operating conditions
- F02D41/08—Introducing corrections for particular operating conditions for idling
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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
- F02D41/30—Controlling fuel injection
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
- B63H—MARINE PROPULSION OR STEERING
- B63H21/00—Use of propulsion power plant or units on vessels
- B63H21/21—Control means for engine or transmission, specially adapted for use on marine vessels
- B63H2021/216—Control means for engine or transmission, specially adapted for use on marine vessels using electric control means
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- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Ocean & Marine Engineering (AREA)
- Output Control And Ontrol Of Special Type Engine (AREA)
Abstract
The invention belongs to the technical field of ship propulsion control, and particularly relates to a cylinder-cutoff control method for reducing the speed reduction of a ship propulsion host. The diesel engine can be connected or disconnected only within a certain rotating speed range, and the range is called a rotating speed window. When a remote control or gearbox controller except a diesel engine control system executes the connection or disconnection, the diesel engine control system cannot predict the switching between the cylinder-cut mode and the full-cylinder mode, so that the rotating speed of the diesel engine rapidly decreases or increases, therefore, the invention sets a first threshold value w between the oil injection quantity required by no-load in the cylinder-cut working mode and the oil injection quantity required after the connection or the disconnection1Setting a second threshold value w between the oil injection quantity required by the connecting and discharging and the oil injection quantity required by the no-load in the full-cylinder working mode2And the diesel engine control system detects the current fuel injection quantity w, judges the current working mode of the diesel engine, and determines whether the working mode of the diesel engine is switched or not by comparing with the fuel injection quantity threshold of the judged working mode, so that the rotation speed fluctuation of the diesel engine can be reduced, and the fuel consumption can be reduced.
Description
Technical Field
The invention belongs to the technical field of ship propulsion control, and particularly relates to a cylinder-cutoff control method for reducing the speed reduction of a ship propulsion host.
Background
Shortage of petroleum resources has become a common problem worldwide, and with the rapid development of economy in China, the consumption of petroleum resources is increasing day by day. According to statistics, the apparent consumption of petroleum in China in 2018 breaks through 6 hundred million tons for the first time, the apparent consumption reaches 6.25 hundred million tons, the speed is increased by 7 percent, and the speed is increased by 1.1 percent compared with the increase speed in 2017. With the increasingly stricter regulations on the exhaust emission and oil consumption of ships, the requirement for reducing the oil consumption of a multi-cylinder large-displacement diesel engine is more urgent. The diesel engine is used as the main power output of the ship at present, and a control method for reducing the oil consumption of the diesel engine becomes a hot point concerned in the industry. The cylinder-off control of a diesel engine used as a marine propulsion host mainly depends on whether the diesel engine is connected or not, and in order to ensure the working performance of the diesel engine and meet the requirement of the running oil limit of the diesel engine, the connection, the disconnection and the like can be carried out only in a certain rotating speed range, and the rotating speed range is called as a rotating speed window. At present, the diesel engine has two conditions of connecting and exhausting control: firstly, the diesel engine control system is used for carrying out the connecting and discharging operation, and when the mode is adopted, the diesel engine control system can exit the cylinder-breaking working mode and enter the full-cylinder working mode before connecting and discharging, so that the diesel engine is ensured to have enough power to drive the propeller to work; and secondly, the connection and drainage operation is carried out by a remote control or a gearbox controller except the diesel engine control system, under the condition, the diesel engine control system does not know that the working mode is required to be switched in advance, and still continuously operates in a cylinder-breaking mode, and the working mode is switched when a connection and drainage signal is transmitted to the diesel engine control system, so that the rotation speed of the diesel engine is rapidly reduced in the period before the connection and drainage signal reaches the diesel engine control system, and even the diesel engine is stopped in serious cases. The present invention is primarily directed to the second case.
In the conventional publications, the present disclosure is mainly explained about a cylinder deactivation device and method for an engine for a vehicle, and for example, a patent document with publication number CN107542583A discloses a control device and method for a cylinder deactivation mode of an engine, wherein the cylinder deactivation control device includes the following five parts: the control method depends on the supercharger intervention signal detection module of the explained cylinder-cut control device to detect whether a signal of supercharger intervention exists, then the mode switching module judges whether the supercharger intervention signal exists to switch between a cylinder-cut mode and a full-cylinder mode, and the oil injection control module is used for controlling the oil injection of the oil injector. The method has the advantages that the switching limit of the cylinder-off mode and the full-cylinder mode is given by using the intervention signal of the supercharger, but the cylinder-off control method for reducing the speed reduction of the marine diesel engine in the line-up and exhaust is not involved.
Also, for example, patent invention publication No. CN102493879A discloses an adaptive cylinder deactivation control technique for an electronic fuel injection engine, which determines that the engine is operating in a cylinder deactivation operable region from a single detection of the engine speed, gradually increases the cylinder deactivation rate to deactivate the cylinder of the engine, and simultaneously monitors whether the change of the engine speed reaches a minimum limit value, and stops the cylinder deactivation operation if the change reaches the minimum limit value. The implementation method of the technology is simple, the rotating speed reduction fluctuation is small when the cylinder is cut off, but the cylinder cutting off control method for reducing the speed reduction when the marine diesel engine is connected and arranged is not involved.
The patent document with application publication number CN107387245A mentions a partial cylinder deactivation control method for low-load operation of a locomotive diesel engine, which mainly aims to solve the problems of oil accumulation and carbon deposition and harmful emission of the locomotive diesel engine under low load. The technology reduces carbon deposition and prolongs the maintenance period under the low-load working condition without modifying the hardware of the diesel engine, but does not relate to a cylinder deactivation control method for reducing the speed reduction of the marine diesel engine from no load to load.
Disclosure of Invention
The invention aims to provide a cylinder-breaking control method for reducing the speed reduction of a ship propulsion host, aiming at the problem that when the remote control or a gearbox controller outside a diesel engine control system is used for carrying out the connecting and exhausting operation, the diesel engine control system does not receive a connecting and exhausting feedback signal and continues to work in a cylinder-breaking mode, so that the rotating speed is rapidly reduced in the connecting and exhausting process, after the diesel engine enters a full-cylinder working mode, the output power of the diesel engine can be improved, the rotating speed is prevented from being greatly reduced, and the dynamic property of the diesel engine in the connecting and exhausting process is ensured.
The purpose of the invention is realized as follows:
a cylinder-breaking control method for reducing the speed reduction of a ship propulsion main engine in a connecting row comprises the following steps:
(1) presetting a first threshold value w between the idle load required fuel injection quantity value and the fuel injection quantity value after row connection in the cylinder-off working mode of the diesel engine1；
(2) Presetting a second threshold value w between the oil injection quantity value required by the diesel engine in the connecting and discharging operation of the full-cylinder working mode and the oil injection quantity required by the full-cylinder working mode after the discharging and unloading2；
(3) Detecting the current diesel engine oil injection quantity value w;
(4) judging the current diesel engine working mode by the diesel engine control system, if the current diesel engine working mode is the cylinder-off working mode, entering the step (5), and if the current diesel engine working mode is the cylinder-off working mode, entering the step (7);
(5) judging whether the fuel injection quantity required by the diesel engine exceeds a first threshold value w1If yes, entering the step (6), otherwise, continuing the cylinder-off working mode;
(6) the diesel engine control system is switched from a cylinder-cut working mode to a full-cylinder working mode, and oil injection of a cylinder of the diesel engine is recovered;
(7) judging whether the fuel injection quantity w required by the diesel engine is smaller than a second threshold value w2If so, entering the step (8), otherwise, continuing the all-cylinder working mode;
(8) the diesel engine control system is switched from the full-cylinder working mode to the cylinder-cut working mode, and oil injection of partial cylinders of the diesel engine is stopped.
The first threshold value w1The value is between the oil injection quantity required after the cylinder-cut working mode is connected and arranged and the oil injection quantity required by the full-cylinder working mode after the cylinder is connected and arranged, and the value is close to the oil injection quantity required by the full-cylinder working mode after the cylinder is connected and arranged; the second threshold value w2No-load requirement for value in cylinder-off working modeBetween the fuel injection quantity and the fuel injection quantity required by the no-load of the full-cylinder working mode, the value of the fuel injection quantity is close to the fuel injection quantity required by the no-load of the cylinder-cut working mode, and the first threshold value w1Greater than a second threshold value w2And the specific numerical value is obtained by calibration experiment measurement.
The invention has the beneficial effects that:
according to the invention, a first threshold value w is set between the idle-load required fuel injection quantity and the fuel injection quantity after the connection and the exhaust in the cylinder-off working mode1Setting a second threshold value w between the oil injection quantity required by the connecting and discharging and the oil injection quantity required by the no-load in the full-cylinder working mode2The diesel engine control system detects the current fuel injection quantity w, judges the current working mode of the diesel engine, and determines whether the working mode of the diesel engine is switched or not by comparing with the fuel injection quantity threshold value of the judged working mode, so that the rotation speed fluctuation of the diesel engine can be reduced, and the fuel consumption can be reduced; in the connecting and discharging process, after the diesel engine enters a full-cylinder working mode, the output power of the diesel engine can be improved, the rotating speed is prevented from being greatly reduced, and the dynamic property of the diesel engine in the connecting and discharging process is ensured.
Drawings
FIG. 1 is a flow chart of a method for controlling a diesel engine from a cylinder-off working mode to a full-cylinder working mode from no-load to row-connection and controlling the diesel engine from the full-cylinder working mode to the cylinder-off working mode from row-connection operation to row-disconnection unloading according to the embodiment of the invention;
fig. 2 is a graph illustrating a method for controlling the cylinder deactivation mode to the full cylinder operation mode from idle operation to power-on operation in the embodiment of the present invention, and a method for controlling the full cylinder operation mode to the cylinder deactivation mode from power-on operation to power-off unloading operation in the embodiment of the present invention.
Detailed Description
The invention will be further elucidated with reference to the drawing.
A cylinder-off control method for reducing the speed reduction of the main engine of ship propulsion features that when the diesel engine is running at low speed, the gear box is not engaged, the propeller is not working, and when the diesel engine is running in cylinder-off mode, the diesel engine is controlled by remote controller or gear box controllerWhen the diesel engine works under a load working condition, the rotating speed of the diesel engine is rapidly reduced during the connecting and discharging period because the diesel engine control system does not receive a gear box connecting and discharging control command or a feedback signal at the moment, and the diesel engine control system needs to increase the oil injection quantity of the diesel engine in order to restore the rotating speed to the set rotating speed at the moment; when the exhaust unloading is carried out, the load of the diesel engine becomes no-load, and the control system can reduce the fuel injection quantity of the diesel engine so as to avoid the rotating speed of the diesel engine from rising. The method according to the invention is therefore based on the increase in the injected fuel quantity by setting a first threshold value w between the idle-load required injected fuel quantity in the cylinder-cut operating mode and the injected fuel quantity required after the connection of the rows1When the diesel engine runs from start to no-load operation, the diesel engine runs in a cylinder-cut-off working mode, when the connecting and draining operation is executed, the rotating speed is reduced because the diesel engine is loaded, the diesel engine control system needs to increase the fuel injection quantity to reach the set rotating speed, and when the fuel injection quantity of the diesel engine is greater than a first threshold value w1When the diesel engine is in the full-cylinder working mode, the diesel engine enters the full-cylinder working mode from the cylinder-off working mode; when the diesel engine runs in the full-cylinder working mode during the discharging unloading, the diesel engine control system reduces the fuel injection quantity to avoid the rapid rise of the rotating speed of the diesel engine, and a second threshold value w is set between the fuel injection quantity required by the connecting discharging in the full-cylinder working mode and the fuel injection quantity required by the no-load operation2When the single-cylinder fuel injection quantity of the diesel engine is reduced to be lower than a second threshold value w2And when the diesel engine is in the full-cylinder working mode, the diesel engine enters a cylinder-off working mode. Wherein the first threshold value w1The value is between the oil injection quantity required after the cylinder-cut working mode is connected and arranged and the oil injection quantity required by the full-cylinder working mode after the cylinder is connected and arranged, and the value is close to the oil injection quantity required by the full-cylinder working mode after the cylinder is connected and arranged; second threshold value w2The value is between the fuel injection quantity required by the no-load of the cylinder-cut working mode and the fuel injection quantity required by the no-load of the full-cylinder working mode, and the value is close to the fuel injection quantity required by the no-load of the cylinder-cut working mode, and an obvious first threshold value w1Greater than a second threshold value w2The specific numerical value can be obtained by calibration experiment measurement.
In FIG. 2, the rotational speed n1To n2Is the rotation speed window range, w, of the diesel engine1Is a first threshold value, w2Is a second threshold value, a is a working condition point of idle running of the cylinder-cut working mode, and b is a working condition point after the cylinder-cut working mode is connectedThe condition points are c, d, e, n and e respectively, wherein c is the working condition point after the full-cylinder working mode is connected, d is the working condition point after the full-cylinder working mode is disconnected, e is the working condition point of the cylinder-breaking working mode after the disconnectionaThe rotation speed of the operating point a.
As shown in figure 2, when the diesel engine executes the connecting and disconnecting operation, the rotating speed window range is n1To n2. When the method is executed, firstly, the working mode of the diesel engine needs to be judged, and the diesel engine is set to be in cylinder-breaking no-load operation at the rotating speed naThe required single-cylinder fuel injection quantity is wa. When the diesel engine executes the connecting and discharging operation through a remote control or a gear box controller except a diesel engine control system, theoretically, the diesel engine drives the propeller to work at a working condition point b after being connected and discharged, but the rotating speed of the diesel engine is obviously reduced, and the oil consumption is increased. Therefore, a first threshold value w is set between the idle-load required fuel injection quantity and the fuel injection quantity after the connection and the exhaust in the cylinder-off working mode of the diesel engine1When the diesel engine control system detects the fuel injection quantity w and cuts off the cylinder working mode and connects the exhaust, the required fuel injection quantity is more than w1When the diesel engine control system is used, the diesel engine control system recovers the oil injection of the oil-cut cylinder, enters a full-cylinder working mode from the cylinder-cut working mode and works at a working condition point c; when the diesel engine is in the full-cylinder working mode, the rotating speed n is usedcWhen the load operates, namely at the working condition point c, the operation of discharging and unloading is executed through a remote control or a gear box controller except a diesel engine control system, theoretically, the diesel engine operates at the working condition point d in a no-load mode after discharging, but the rotating speed of the diesel engine obviously rises, and the rotating speed greatly fluctuates. Thus, a second threshold value w is set between the injection quantity required for the bank-in operation and the injection quantity required for the idle operation in the all-cylinder operating mode2When the diesel engine control system detects that the oil injection quantity w required after the full-cylinder working mode is exhausted is less than w2And when the diesel engine control system stops oil injection of part of the cylinders, the cylinder is cut off, and the diesel engine control system works at a working point e.
With reference to the attached drawing 1, a cylinder-cutoff control method for reducing the speed reduction of a marine propulsion main engine in a connecting row comprises the following steps:
the first step is as follows: presetting a first threshold value w between the idle load required fuel injection quantity value and the fuel injection quantity value after row connection in the cylinder-off working mode of the diesel engine1；
The second step is that: presetting a second threshold value w between the oil injection quantity value required by the diesel engine in the connecting and discharging operation of the full-cylinder working mode and the oil injection quantity required by the full-cylinder working mode after the discharging and unloading2；
The third step: detecting the current diesel engine oil injection quantity value w;
the fourth step: judging the current working mode of the diesel engine by the diesel engine control system, if the current working mode is the cylinder-off working mode, entering the fifth step, and if the current working mode is not the cylinder-off working mode, entering the seventh step;
further, the cylinder-cut control method for reducing the speed reduction of the marine propulsion main engine in the power receiving and discharging process comprises the following steps:
the fifth step: judging whether the fuel injection quantity required by the diesel engine exceeds a first threshold value w1If yes, entering a sixth step, otherwise, continuing the cylinder-off working mode;
and a sixth step: the diesel engine control system is switched from a cylinder-cut working mode to a full-cylinder working mode, and oil injection of a cylinder of the diesel engine is recovered;
the cylinder-cut control method for reducing the speed reduction of the connecting and exhausting of the ship propulsion main engine comprises the following steps from the loading operation of the connecting and exhausting of the diesel engine to the unloading operation of the exhausting of the diesel engine:
the seventh step: judging whether the fuel injection quantity w required by the diesel engine is smaller than a second threshold value w2If yes, entering the eighth step, otherwise, continuing the full-cylinder working mode;
eighth step: the diesel engine control system is switched from a full-cylinder working mode to a cylinder-off working mode, and oil injection of a part of cylinders of the diesel engine is stopped;
the diesel engine may have frequent switching of the operating mode due to oil quantity fluctuation, and for such a situation, a hysteresis comparison method may be adopted to eliminate the influence caused by the oil quantity fluctuation.
The invention provides a cylinder-breaking control method for reducing the speed reduction of a main engine in a connecting and exhausting manner. When the diesel engine control system is removedWhen the external remote control or the gear box controller executes the connecting or the disconnecting, the diesel engine control system can not predict the switching between the cylinder-cut mode and the full-cylinder mode, so that the rotating speed of the diesel engine is rapidly reduced or increased, and therefore, a first threshold value w is set between the oil injection quantity required by no-load in the cylinder-cut working mode and the oil injection quantity required after the connecting or the disconnecting1Setting a second threshold value w between the oil injection quantity required by the connecting and discharging and the oil injection quantity required by the no-load in the full-cylinder working mode2The diesel engine control system detects the current fuel injection quantity w, judges the current working mode of the diesel engine, and determines whether the working mode of the diesel engine is switched or not by comparing with the fuel injection quantity threshold value of the judged working mode, so that the aims of reducing the rotation speed fluctuation of the diesel engine and reducing the fuel consumption are fulfilled.
Claims (2)
1. A cylinder-off control method for reducing the speed reduction of a ship propulsion main engine in a connecting row is characterized by comprising the following steps:
(1) presetting a first threshold value w between the idle load required fuel injection quantity value and the fuel injection quantity value after row connection in the cylinder-off working mode of the diesel engine1；
(2) Presetting a second threshold value w between the oil injection quantity value required by the diesel engine in the connecting and discharging operation of the full-cylinder working mode and the oil injection quantity required by the full-cylinder working mode after the discharging and unloading2；
(3) Detecting the current diesel engine oil injection quantity value w;
(4) judging the current diesel engine working mode by the diesel engine control system, if the current diesel engine working mode is the cylinder-off working mode, entering the step (5), and if the current diesel engine working mode is the cylinder-off working mode, entering the step (7);
(5) judging whether the fuel injection quantity required by the diesel engine exceeds a first threshold value w1If yes, entering the step (6); otherwise, continuing the cylinder-off working mode;
(6) the diesel engine control system is switched from a cylinder-cut working mode to a full-cylinder working mode, and oil injection of a cylinder of the diesel engine is recovered;
(7) judging whether the fuel injection quantity w required by the diesel engine is smaller than a second threshold value w2If yes, entering the step (8); otherwise, continuing the full-cylinder working mode;
(8) the diesel engine control system is switched from the full-cylinder working mode to the cylinder-cut working mode, and oil injection of partial cylinders of the diesel engine is stopped.
2. The cylinder deactivation control method for reducing the main engine line-up deceleration of ship propulsion according to claim 1, characterized in that: the first threshold value w1The value is between the oil injection quantity required after the cylinder-cut working mode is connected and arranged and the oil injection quantity required by the full-cylinder working mode after the cylinder is connected and arranged, and the value is close to the oil injection quantity required by the full-cylinder working mode after the cylinder is connected and arranged; the second threshold value w2The value is between the fuel injection quantity required by the no-load of the cylinder-cut working mode and the fuel injection quantity required by the no-load of the full-cylinder working mode, and the value is close to the fuel injection quantity required by the no-load of the cylinder-cut working mode, and the first threshold value w1Greater than a second threshold value w2And the specific numerical value is obtained by calibration experiment measurement.
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| CN201910644006.5A CN110454288B (en) | 2019-07-17 | 2019-07-17 | Cylinder-breaking control method for reducing connecting, arranging and speed-reducing of ship propulsion main engine |
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| CN201910644006.5A CN110454288B (en) | 2019-07-17 | 2019-07-17 | Cylinder-breaking control method for reducing connecting, arranging and speed-reducing of ship propulsion main engine |
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Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101858259A (en) * | 2010-04-15 | 2010-10-13 | 中国第一汽车集团公司 | Cylinder-deactivated oil-saving control method for partial cylinder of diesel engine |
| CN107387245A (en) * | 2017-08-15 | 2017-11-24 | 中车大连机车车辆有限公司 | Diesel engine of locomotive underrun part cylinder deactivation control method |
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| JP2002227675A (en) * | 2001-02-05 | 2002-08-14 | Sanshin Ind Co Ltd | Control device for operation of personal watercraft engine |
| JP2002371875A (en) * | 2001-04-11 | 2002-12-26 | Sanshin Ind Co Ltd | Engine control device of water jet propelled craft |
| US20160252033A1 (en) * | 2016-05-09 | 2016-09-01 | Caterpillar Inc. | Cylinder cutout strategy for operation of engine |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101858259A (en) * | 2010-04-15 | 2010-10-13 | 中国第一汽车集团公司 | Cylinder-deactivated oil-saving control method for partial cylinder of diesel engine |
| CN107387245A (en) * | 2017-08-15 | 2017-11-24 | 中车大连机车车辆有限公司 | Diesel engine of locomotive underrun part cylinder deactivation control method |
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