CN111396221A - High-pressure oil pump sealing oil control system and method under light-heavy oil conversion - Google Patents
High-pressure oil pump sealing oil control system and method under light-heavy oil conversion Download PDFInfo
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- CN111396221A CN111396221A CN202010242528.5A CN202010242528A CN111396221A CN 111396221 A CN111396221 A CN 111396221A CN 202010242528 A CN202010242528 A CN 202010242528A CN 111396221 A CN111396221 A CN 111396221A
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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
- F02M59/00—Pumps specially adapted for fuel-injection and not provided for in groups F02M39/00 -F02M57/00, e.g. rotary cylinder-block type of pumps
- F02M59/44—Details, components parts, or accessories not provided for in, or of interest apart from, the apparatus of groups F02M59/02 - F02M59/42; Pumps having transducers, e.g. to measure displacement of pump rack or piston
- F02M59/442—Details, components parts, or accessories not provided for in, or of interest apart from, the apparatus of groups F02M59/02 - F02M59/42; Pumps having transducers, e.g. to measure displacement of pump rack or piston means preventing fuel leakage around pump plunger, e.g. fluid barriers
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B53/00—Component parts, details or accessories not provided for in, or of interest apart from, groups F04B1/00 - F04B23/00 or F04B39/00 - F04B47/00
- F04B53/08—Cooling; Heating; Preventing freezing
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B53/00—Component parts, details or accessories not provided for in, or of interest apart from, groups F04B1/00 - F04B23/00 or F04B39/00 - F04B47/00
- F04B53/18—Lubricating
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- Chemical & Material Sciences (AREA)
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- Fuel-Injection Apparatus (AREA)
Abstract
The invention discloses a system and a method for controlling sealing oil of a high-pressure oil pump under light-heavy oil conversion, wherein the system comprises a high-pressure oil pump, a fuel oil inlet pipeline, a fuel oil drainage pipeline, a sealing oil pipeline, a dirty oil tank, an oil cleaning pipeline and an oil cleaning tank; the sealed oil pipeline is provided with a control valve, and the dirty oil pipeline and the clean oil pipeline are connected with the fuel oil drainage pipeline through a switching control valve for controlling the conduction of the fuel oil drainage pipeline and the dirty oil pipeline or the clean oil pipeline; the control valve and the switching control valve are both controlled by an engine control unit. The method comprises the following steps: when a sealing oil control program of the high-pressure oil pump under light oil conversion is not started, executing a sealing oil control step in a light oil mode by default; if the oil seal control device is started, when the oil seal control device is judged to be in the heavy oil mode, executing a seal oil control step in the heavy oil mode; and executing the seal oil control step in the light oil mode when the light oil mode is judged. The invention can realize the respective control of the high-pressure oil pump sealing oil in a light heavy oil mode; saves resources and reduces cost.
Description
Technical Field
The invention belongs to the technical field of engine lubrication and cooling, and particularly relates to a high-pressure oil pump sealing oil control system and method under light-heavy oil conversion.
Background
Due to increasingly stringent emission regulations and operating costs, marine diesel engines typically use heavy diesel oil (HFO) when driving normally in deep sea areas, and ordinary diesel oil (MDO) or light diesel oil (MGO) when offshore or port landing. The common diesel engine is provided with a light and heavy oil mode conversion control program, and when the engine uses heavy diesel oil, an engine control system is set to be in a heavy oil mode; when the engine uses normal diesel oil or light oil, the engine control system is set to a light oil mode; at present, the conversion of light and heavy oil modes in an engine control system is mainly realized by judging the oil temperature.
As shown in fig. 1 and 2, the high-pressure oil pump 1 is a main component of a fuel system, and is closely related to the type and quality of fuel. The plunger 11 is used as a main moving part of the high-pressure oil pump 1, and in order to reduce the abrasion of the high-pressure oil pump, a part of fuel is guided to a position between the plunger 11 and the plunger sleeve 12 through a fuel inlet A for lubrication and cooling, and a fuel drain opening B is opened for discharging the part of fuel. However, when the fuel used by the engine is MDO or MGO, the fuel density and viscosity are low, the fuel may leak downward through the gap between the plunger 11 and the plunger sleeve 12, and may contaminate the lubricant to aggravate the lubricant aging, and even affect the lubrication of other components, in order to prevent the above phenomena, it is generally necessary to introduce a small amount of lubricant with high viscosity as the sealing oil into the gap between the plunger 11 and the plunger sleeve 12 through the sealing oil inlet C, so as to prevent the fuel from leaking downward through the gap between the plunger 11 and the plunger sleeve 12. However, when the fuel used by the engine is HFO, the fuel has high density and viscosity, and the fuel between the plunger 11 and the plunger sleeve 12 leaks little or no fuel downward, so that additional sealing oil is not needed.
As shown in fig. 3, in order to avoid the influence of fuel pollution on combustion and the service life of each part, the oil drainage amount is mostly selected and sacrificed, and the characteristics of the fuel in the light and heavy oil mode and the functions of the seal oil are not considered; namely, in both the light oil mode and the heavy oil mode, the high-pressure oil pump fuel drain is discharged directly to the dirty oil tank 5 as dirty oil. The processing mode can avoid that the fuel oil leaks downwards through the plunger clearance to pollute the lubricating oil when the fuel oil is light oil; however, when the fuel oil is heavy oil, if the sealing oil is still used for unnecessary sealing and is discharged to the dirty oil tank 5, the fuel oil is wasted, and the cost is increased; meanwhile, because the sealing oil is always introduced into the plunger, part of the sealing oil can be taken away by oil drainage all the time, and the consumption of the sealing oil is also aggravated.
In view of this, it is needed to fully consider the characteristics of the fuel oil in the light and heavy oil mode and the functions of the seal oil, improve the prior art, and design and develop a control system and a control method for respectively controlling the seal oil of the high-pressure oil pump in the light and heavy oil mode, so as to save resources and reduce cost.
Disclosure of Invention
The invention aims to overcome the defects in the prior art, and the technical problem to be solved by the invention is to provide the control system and the control method for the high-pressure oil pump sealing oil under the light-heavy oil conversion, which can respectively control the high-pressure oil pump sealing oil in a light-heavy oil mode, thereby saving resources and reducing cost.
In order to solve the technical problem, in a first aspect, an embodiment of the present invention provides a control system for sealing oil of a high-pressure oil pump under light-heavy oil conversion, where the control system includes a high-pressure oil pump, a fuel oil inlet pipeline, a fuel oil drainage pipeline, a sealing oil pipeline, a dirty oil pipeline, and a dirty oil tank communicated with the dirty oil pipeline; the fuel oil inlet pipeline is communicated with a fuel oil inlet arranged on the high-pressure oil pump, the fuel oil drainage pipeline is communicated with a fuel oil drainage port arranged on the high-pressure oil pump, and the sealing oil pipeline is communicated with a sealing oil inlet arranged on the high-pressure oil pump; the control system is characterized by further comprising an oil cleaning pipeline and an oil cleaning tank communicated with the oil cleaning pipeline;
the sealed oil pipeline is provided with a control valve for controlling the on-off of the sealed oil pipeline, the dirty oil pipeline and the clean oil pipeline are connected with the fuel oil drainage pipeline through a switching control valve, and the switching control valve is used for controlling the on-off of the fuel oil drainage pipeline and the dirty oil pipeline or the clean oil pipeline;
the control valve and the switching control valve are both controlled by an engine control unit.
Further, the control valve is a two-position two-way electromagnetic valve or a two-position two-way electric valve.
Further, the switching control valve is a two-position three-way electromagnetic valve or a two-position three-way electric valve; and the inlet port of the switching control valve is connected with the fuel oil drainage pipeline, and the two outlet ports are respectively connected with the dirty oil pipeline and the clean oil pipeline.
Further, the switching control valve comprises two-position two-way control valves, one of the two-position two-way control valves is connected between the fuel oil drainage pipeline and the oil pollution pipeline, and the other one of the two-position two-way control valves is connected between the fuel oil drainage pipeline and the oil cleaning pipeline.
In a second aspect, an embodiment of the present invention provides a method for controlling seal oil of a high-pressure oil pump under light-heavy oil conversion, where the method for controlling seal oil of a high-pressure oil pump under light-heavy oil conversion is used, and the method includes the following steps:
s1, operating on an operation screen electrically connected with the engine control unit, and selecting whether to start a high-pressure oil pump sealing oil control program under the conversion of light oil and heavy oil pre-implanted into the engine control unit;
s2, when a high-pressure oil pump sealing oil control program under light oil and heavy oil conversion is not started, the engine control unit executes the sealing oil control step under the light oil mode by default;
s3, if a high-pressure oil pump sealing oil control program under light oil and heavy oil conversion is started, the engine control unit judges whether the current engine fuel oil mode is a heavy oil mode or a light oil mode; if the oil seal control device is in the heavy oil mode, the engine control unit starts to execute the oil seal control step in the heavy oil mode; if the engine is in the light oil mode, the engine control unit starts to execute the sealed oil control step in the light oil mode.
Further, the step S3 further includes:
and if the engine control unit cannot judge whether the current engine fuel mode is the heavy oil mode or the light oil mode, executing the sealed oil control step in the light oil mode by default and repeatedly judging.
Further, the step S3 further includes:
if the engine control unit is in the process of executing the seal oil control step in the heavy oil mode, when the current engine fuel oil mode is switched from the heavy oil mode to the light oil mode, the seal oil control step in the light oil mode is executed instead;
and if the current engine fuel oil mode is switched from the light oil mode to the heavy oil mode in the process of executing the seal oil control step in the light oil mode by the engine control unit, executing the seal oil control step in the heavy oil mode instead.
Further, the sealing oil control step in the light oil mode is:
the engine control unit controls the control valve to conduct the sealed oil pipeline, and controls the switching control valve to conduct the fuel oil drainage pipeline and the dirty oil pipeline.
Further, the seal oil control step in the heavy oil mode is:
the engine control unit controls the control valve to stop the sealing oil pipeline;
starting timing by a timer built in the engine control unit;
keeping the fuel oil drainage pipeline and the dirty oil pipeline in conduction within a preset time;
and after the preset time is reached, controlling the switching control valve to enable the fuel oil drainage pipeline to be communicated with the oil cleaning pipeline.
Further, the control valve is a power-off normally-open control valve; and the switching control valve enables the fuel oil drainage pipeline to be communicated with the dirty oil pipeline in a power-off state.
Due to the adoption of the technical scheme, the beneficial effects are as follows:
the invention relates to a system and a method for controlling the sealing oil of a high-pressure oil pump under light and heavy oil conversion.A control valve for controlling the on-off of the sealing oil pipeline is arranged on the sealing oil pipeline in the control system; the control valve and the switching control valve are electrically connected with the engine control unit. When the engine control unit judges that the current engine fuel mode is the light oil mode, the engine control unit executes the sealed oil control step in the light oil mode; at the moment, a sealing oil pipeline in the control system is communicated, a fuel oil drainage pipeline is communicated with a dirty oil pipeline and sealed by sealing oil, and fuel oil mixed with the sealing oil is discharged to a dirty oil tank; when the engine control unit judges that the current engine fuel oil mode is the heavy oil mode, the engine control unit starts to execute a sealed oil control step in the heavy oil mode; at the moment, a sealing oil pipeline in the control system is not conducted, a fuel oil drainage pipeline is conducted with a clean oil pipeline and sealed by fuel oil, and fuel oil which is not mixed with sealing oil is discharged to a clean oil tank so as to be reused.
In conclusion, the characteristics of the fuel oil in the light and heavy oil modes and the function of the sealing oil are fully considered; the control of the high-pressure oil pump sealing oil under the light and heavy oil mode is realized, the resource is saved, and the cost is reduced.
Drawings
FIG. 1 is a sectional view showing a structure of a high pressure oil pump in the prior art;
FIG. 2 is a schematic view showing an external structure of a high-pressure oil pump in the prior art;
FIG. 3 is a schematic diagram of a seal oil control system of a high pressure oil pump in the prior art;
FIG. 4 is a schematic diagram of a first embodiment of a high pressure oil pump seal oil control system under light to heavy oil conversion in accordance with the present invention;
FIG. 5 is a schematic diagram of a second embodiment of a high pressure oil pump seal oil control system under light to heavy oil conversion in accordance with the present invention;
FIG. 6 is a logic diagram of the method for controlling the sealing oil of the high pressure oil pump under the condition of light oil conversion and heavy oil conversion;
FIG. 7 is a detailed flow chart of the method for controlling the sealing oil of the high-pressure oil pump under the condition of light-heavy oil conversion according to the invention;
in the figure, 1-a high-pressure oil pump, 11-a plunger, 12-a plunger sleeve, 2-a sealing oil pipeline, 3-a fuel oil inlet pipeline, 4-a fuel oil drainage pipeline, 5-a dirty oil tank, 51-a dirty oil pipeline, 6-a clean oil tank, 61-a clean oil pipeline, 7-a two-position two-way electromagnetic valve, 8-a two-position three-way electromagnetic valve, 81-a two-position two-way control valve, 9-an engine control unit, A-a fuel oil inlet, B-a fuel oil drainage port and C-a sealing oil inlet.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
The first embodiment is as follows:
as shown in fig. 1 and 4, in the present embodiment, the high-pressure oil pump sealing oil control system under light-heavy oil conversion includes a high-pressure oil pump 1, a fuel oil inlet pipeline 3, a fuel oil drain pipeline 4, a sealing oil pipeline 2, a dirty oil pipeline 51, and a dirty oil tank 5 communicated with the dirty oil pipeline 51; the fuel oil inlet pipeline 3 is communicated with a fuel oil inlet A arranged on the high-pressure oil pump 1, the fuel oil drainage pipeline 4 is communicated with a fuel oil drainage port B arranged on the high-pressure oil pump 1, and the sealing oil pipeline 2 is communicated with a sealing oil inlet C arranged on the high-pressure oil pump 1; the control system further comprises a clean oil line 61 and a clean oil tank 6 communicating with the clean oil line 61.
The sealed oil pipeline 2 is provided with a control valve for controlling the on-off of the sealed oil pipeline, the dirty oil pipeline 51 and the clean oil pipeline 61 are connected with the fuel oil drainage pipeline 4 through a switching control valve, and the switching control valve is used for controlling the fuel oil drainage pipeline 4 to be communicated with the dirty oil pipeline 51 or the clean oil pipeline 61; the control valves and the switching control valves are controlled by an engine control unit 9.
In this embodiment, the control valve is a two-position two-way electromagnetic valve 7, and when the pipe diameter of the diesel engine is larger, the control valve can also be a two-position two-way electromagnetic valve controlled by an electric actuator. The switching control valve is a two-position three-way electromagnetic valve 8 or a two-position three-way electric valve; the inlet port of the switching control valve is connected with the fuel oil drain pipeline 4, and the two outlet ports are respectively connected with the dirty oil pipeline 51 and the clean oil pipeline 61.
Example two:
the present embodiment differs from the above-described embodiment in that the switching control valve is different, and only the difference will be described in detail below.
As shown in fig. 5, in the present embodiment, the switching control valve includes two-position two-way control valves 81, one two-position two-way control valve 81 is connected between the fuel drain line 4 and the dirty oil line 51, and the other two-position two-way control valve 81 is connected between the fuel drain line 4 and the clean oil line 61.
Example three:
the embodiment discloses a control method for sealing oil of a high-pressure oil pump under light-heavy oil conversion, which uses the control system for sealing oil of a high-pressure oil pump under light-heavy oil conversion, and is collectively shown in fig. 4 and 6, and the control method comprises the following steps:
and S1, operating on an operation screen electrically connected with the engine control unit 9, and selecting whether to start a high-pressure oil pump sealing oil control program under the condition of light oil conversion and heavy oil conversion pre-implanted into the engine control unit 9.
S2, when the high pressure oil pump seal oil control routine under light oil and heavy oil switching is not started, the engine control unit 9 executes the seal oil control step a in the light oil mode by default. That is, seal oil (lubricating oil, also referred to as engine oil) is added, and the fuel oil mixed with the seal oil is discharged to the dirty oil tank 5.
S3, if a high-pressure oil pump sealing oil control program under light oil and heavy oil conversion is started, the engine control unit 9 judges whether the current engine fuel oil mode is a heavy oil mode or a light oil mode; if the oil is in the heavy oil mode, the engine control unit 9 starts to execute the sealing oil control step b in the heavy oil mode, that is, sealing oil is not added, and fuel oil which is not mixed with sealing oil is discharged to the oil cleaning tank 6; if the engine is in the light oil mode, the engine control unit 9 starts the seal oil control step a in the light oil mode.
The judgment of the engine control unit 9 as to whether the current engine fuel mode is the heavy oil mode or the light oil mode is executed based on a light-heavy oil mode conversion control program which is pre-implanted into the engine control unit 9, and the judgment can be generally carried out through the fuel temperature; such methods are well known to those skilled in the art and will not be described in detail herein.
In the specific implementation of the control method shown in fig. 7, in order to further prevent the occurrence of a small-probability fault and disturb the ordered progress of the program, the following steps are added to step S3:
if the engine control unit 9 cannot determine whether the current engine fuel mode is the heavy oil mode or the light oil mode due to a fault, the sealed oil control step a in the light oil mode is executed by default and the determination is repeated. Is used for preventing the fuel oil from leaking to pollute the lubricating oil and preventing dirty oil from entering the clean oil tank 6 when the fuel oil is light oil.
The following steps are also added to step S3:
if the engine control unit 9 switches the current engine fuel mode from the heavy oil mode to the light oil mode during the execution of the seal oil control step b in the heavy oil mode (normally, the mode switching is performed after the execution of the seal oil control step in the heavy oil mode, that is, after the preset time is completed; the chain line in the figure shows that if the pipeline is too long and the preset time is long, the mode switching may be performed before the execution of the seal oil control step b in the heavy oil mode is completed, and at this time, the timing function of the timer does not work any more), the seal oil control step a in the light oil mode is executed instead.
If the engine control unit 9 switches the current engine fuel mode from the light oil mode to the heavy oil mode during the execution of the seal oil control step a in the light oil mode, the seal oil control step b in the heavy oil mode is executed instead.
Wherein the sealing oil control step a in the light oil mode is as follows:
the engine control unit 9 controls the control valve to conduct the sealing oil pipeline 2, and controls the switching control valve to conduct the fuel oil drainage pipeline 4 and the dirty oil pipeline 51.
The sealing oil control step b in the heavy oil mode is as follows:
b1, the engine control unit 9 controls the control valve to stop the sealing oil pipeline 2.
b2, and a timer built in the engine control unit 9.
b3, keeping the conduction between the fuel oil drainage pipeline 4 and the oil drain pipeline 51 within the preset time (which can be set to 10S, and the time is cleared after the 10S is reached).
b4, after the preset time is reached, controlling the switching control valve to conduct the fuel oil drain pipeline 4 and the clean oil pipeline 61.
When the control valve is just closed, residual dirty oil can be left in the fuel oil drainage pipeline 4, in order to ensure that the dirty oil in the fuel oil drainage pipeline 4 is fully drained, a timer is used for setting timing time, the fuel oil drainage pipeline 4 is communicated with the clean oil pipeline 61 after timing is finished, and fuel oil drainage returns to the clean oil tank 6; the pollution of fuel oil drainage of the pump is avoided, and clean fuel oil is collected.
In the embodiment, the control valve is a power-off normally-open control valve; the switching control valve switches on the fuel drain line 4 and the dirty oil line 51 in the power-off state. When a small probability fault is met, namely the control valve and the switching control valve are powered off, the engine control unit 9 executes the sealing oil control step a (shown as a two-dot chain line in the figure) in the light oil mode by default at the moment; is used for preventing the fuel oil from leaking to pollute the lubricating oil and preventing dirty oil from entering the clean oil tank 6 when the fuel oil is light oil.
In conclusion, the intelligent control of the sealing oil of the high-pressure oil pump can be realized only by additionally arranging the control valve and the switching control valve on the corresponding pipeline and implanting a control program in the engine control unit; the characteristics of fuel oil and the effect that sealing oil can exert under the light heavy oil mode have fully been considered, have realized under the light heavy oil mode, respectively control high-pressure oil pump sealing oil: in the light oil mode, the sealing oil pipeline 2 is conducted so that sealing oil enters, and fuel oil drainage of the high-pressure oil pump returns to the dirty oil tank 5; in the heavy oil mode, the sealing oil is cut off by the sealing oil pipeline 2, and the fuel oil drained by the high-pressure oil pump returns to the clean oil tank 6. The engine can reliably run, and meanwhile, the fuel pollution, the fuel waste and the cost are reduced.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents and improvements made within the spirit and principle of the present invention are intended to be included within the scope of the present invention.
Claims (10)
1. A high-pressure oil pump sealing oil control system under light and heavy oil conversion comprises a high-pressure oil pump, a fuel oil inlet pipeline, a fuel oil drainage pipeline, a sealing oil pipeline, a dirty oil pipeline and a dirty oil tank communicated with the dirty oil pipeline; the fuel oil inlet pipeline is communicated with a fuel oil inlet arranged on the high-pressure oil pump, the fuel oil drainage pipeline is communicated with a fuel oil drainage port arranged on the high-pressure oil pump, and the sealing oil pipeline is communicated with a sealing oil inlet arranged on the high-pressure oil pump; the control system is characterized by further comprising an oil cleaning pipeline and an oil cleaning tank communicated with the oil cleaning pipeline;
the sealed oil pipeline is provided with a control valve for controlling the on-off of the sealed oil pipeline, the dirty oil pipeline and the clean oil pipeline are connected with the fuel oil drainage pipeline through a switching control valve, and the switching control valve is used for controlling the on-off of the fuel oil drainage pipeline and the dirty oil pipeline or the clean oil pipeline;
the control valve and the switching control valve are both controlled by an engine control unit.
2. The system as claimed in claim 1, wherein the control valve is a two-position two-way solenoid valve or a two-position two-way solenoid valve.
3. The system for controlling the sealing oil of the high-pressure oil pump under the conversion of light oil and heavy oil of claim 1, wherein the switching control valve is a two-position three-way electromagnetic valve or a two-position three-way electric valve; and the inlet port of the switching control valve is connected with the fuel oil drainage pipeline, and the two outlet ports are respectively connected with the dirty oil pipeline and the clean oil pipeline.
4. The system for controlling the sealing oil of the high-pressure oil pump under the conversion of the light oil and the heavy oil as claimed in claim 1, wherein the switching control valve comprises two-position two-way control valves, one of the two-position two-way control valves is connected between the fuel oil drainage pipeline and the oil drainage pipeline, and the other of the two-position two-way control valves is connected between the fuel oil drainage pipeline and the oil cleaning pipeline.
5. A method for controlling the sealing oil of a high-pressure oil pump under light-heavy oil conversion is characterized in that the system for controlling the sealing oil of the high-pressure oil pump under light-heavy oil conversion of any one of claims 1 to 4 is used, and the control method comprises the following steps:
s1, operating on an operation screen electrically connected with the engine control unit, and selecting whether to start a high-pressure oil pump sealing oil control program under the conversion of light oil and heavy oil pre-implanted into the engine control unit;
s2, when a high-pressure oil pump sealing oil control program under light oil and heavy oil conversion is not started, the engine control unit executes the sealing oil control step under the light oil mode by default;
s3, if a high-pressure oil pump sealing oil control program under light oil and heavy oil conversion is started, the engine control unit judges whether the current engine fuel oil mode is a heavy oil mode or a light oil mode; if the oil seal control device is in the heavy oil mode, the engine control unit starts to execute the oil seal control step in the heavy oil mode; if the engine is in the light oil mode, the engine control unit starts to execute the sealed oil control step in the light oil mode.
6. The method for controlling the sealing oil of the high-pressure oil pump under the conversion of light oil and heavy oil according to claim 5, wherein the step S3 further comprises:
and if the engine control unit cannot judge whether the current engine fuel mode is the heavy oil mode or the light oil mode, executing the sealed oil control step in the light oil mode by default and repeatedly judging.
7. The method for controlling the sealing oil of the high-pressure oil pump under the conversion of light oil and heavy oil according to claim 5, wherein the step S3 further comprises:
if the engine control unit is in the process of executing the seal oil control step in the heavy oil mode, when the current engine fuel oil mode is switched from the heavy oil mode to the light oil mode, the seal oil control step in the light oil mode is executed instead;
and if the current engine fuel oil mode is switched from the light oil mode to the heavy oil mode in the process of executing the seal oil control step in the light oil mode by the engine control unit, executing the seal oil control step in the heavy oil mode instead.
8. The method for controlling the seal oil of the high-pressure oil pump under the conversion of light oil and heavy oil according to any one of claims 5 to 7, wherein the seal oil control step in the light oil mode is as follows:
the engine control unit controls the control valve to conduct the sealed oil pipeline, and controls the switching control valve to conduct the fuel oil drainage pipeline and the dirty oil pipeline.
9. The method for controlling the seal oil of the high-pressure oil pump under the condition of light oil conversion and heavy oil conversion according to claim 8, wherein the seal oil control step in the heavy oil mode is as follows:
the engine control unit controls the control valve to stop the sealing oil pipeline;
starting timing by a timer built in the engine control unit;
keeping the fuel oil drainage pipeline and the dirty oil pipeline in conduction within a preset time;
and after the preset time is reached, controlling the switching control valve to enable the fuel oil drainage pipeline to be communicated with the oil cleaning pipeline.
10. The method for controlling the sealing oil of the high-pressure oil pump under the condition of light-heavy oil conversion according to claim 5, wherein the control valve is a power-off normally-open control valve; and the switching control valve enables the fuel oil drainage pipeline to be communicated with the dirty oil pipeline in a power-off state.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN114215649A (en) * | 2021-12-31 | 2022-03-22 | 潍柴动力股份有限公司 | Light and heavy oil conversion linkage control method and device for engine |
| CN117267115A (en) * | 2023-11-20 | 2023-12-22 | 中船动力研究院有限公司 | Sealing structure of plunger type movement mechanism |
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| WO2012136208A1 (en) * | 2011-04-05 | 2012-10-11 | York Industries International Hk. Ltd | Triple fuel supply system, methods for switching between different fuel types and method for retro-fitting an existing fuel supply system |
| CN202209215U (en) * | 2011-08-11 | 2012-05-02 | 无锡市康威环能设备有限公司 | light/heavy oil conversion device for oil supply system |
| KR20150077661A (en) * | 2013-12-30 | 2015-07-08 | 에스티엑스조선해양 주식회사 | Fuel oil supply system and ship with the same |
| CN205532897U (en) * | 2016-02-02 | 2016-08-31 | 武汉理工大学 | Quick switched systems of weight oil steady voltage |
| CN108547702A (en) * | 2018-03-30 | 2018-09-18 | 潍柴重机股份有限公司 | A kind of light/heavy oil pattern automatic conversion control method |
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| CN114215649A (en) * | 2021-12-31 | 2022-03-22 | 潍柴动力股份有限公司 | Light and heavy oil conversion linkage control method and device for engine |
| CN114215649B (en) * | 2021-12-31 | 2023-11-17 | 潍柴动力股份有限公司 | Method and device for controlling conversion of light and heavy oil of engine in linkage mode |
| CN117267115A (en) * | 2023-11-20 | 2023-12-22 | 中船动力研究院有限公司 | Sealing structure of plunger type movement mechanism |
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