CN113623079A - Control method for air-fuel ratio of low-pressure dual-fuel host for ship - Google Patents
Control method for air-fuel ratio of low-pressure dual-fuel host for ship Download PDFInfo
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- CN113623079A CN113623079A CN202110663969.7A CN202110663969A CN113623079A CN 113623079 A CN113623079 A CN 113623079A CN 202110663969 A CN202110663969 A CN 202110663969A CN 113623079 A CN113623079 A CN 113623079A
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- Prior art keywords
- fuel ratio
- fuel
- main engine
- air
- actual air
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- 239000000446 fuel Substances 0.000 title claims abstract description 81
- 238000000034 method Methods 0.000 title claims abstract description 14
- 239000007789 gas Substances 0.000 claims abstract description 43
- 238000002347 injection Methods 0.000 claims abstract description 26
- 239000007924 injection Substances 0.000 claims abstract description 26
- 230000002000 scavenging effect Effects 0.000 claims abstract description 14
- 239000002912 waste gas Substances 0.000 claims abstract description 14
- 239000002737 fuel gas Substances 0.000 claims description 8
- 239000002699 waste material Substances 0.000 claims description 8
- 238000002485 combustion reaction Methods 0.000 description 3
- 230000007613 environmental effect Effects 0.000 description 3
- 230000006978 adaptation Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000004907 flux Effects 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
Images
Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D41/00—Electrical control of supply of combustible mixture or its constituents
- F02D41/0025—Controlling engines characterised by use of non-liquid fuels, pluralities of fuels, or non-fuel substances added to the combustible mixtures
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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
- F02D35/00—Controlling engines, dependent on conditions exterior or interior to engines, not otherwise provided for
- F02D35/02—Controlling engines, dependent on conditions exterior or interior to engines, not otherwise provided for on interior conditions
- F02D35/027—Controlling engines, dependent on conditions exterior or interior to engines, not otherwise provided for on interior conditions using knock sensors
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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
- F02D41/0002—Controlling intake air
- F02D41/0007—Controlling intake air for control of turbo-charged or super-charged engines
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D41/00—Electrical control of supply of combustible mixture or its constituents
- F02D41/0025—Controlling engines characterised by use of non-liquid fuels, pluralities of fuels, or non-fuel substances added to the combustible mixtures
- F02D41/0027—Controlling engines characterised by use of non-liquid fuels, pluralities of fuels, or non-fuel substances added to the combustible mixtures the fuel being gaseous
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D41/00—Electrical control of supply of combustible mixture or its constituents
- F02D41/02—Circuit arrangements for generating control signals
- F02D41/14—Introducing closed-loop corrections
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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
- F02D41/38—Controlling fuel injection of the high pressure type
- F02D41/40—Controlling fuel injection of the high pressure type with means for controlling injection timing or duration
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D41/00—Electrical control of supply of combustible mixture or its constituents
- F02D41/30—Controlling fuel injection
- F02D41/38—Controlling fuel injection of the high pressure type
- F02D2041/389—Controlling fuel injection of the high pressure type for injecting directly into the cylinder
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D2250/00—Engine control related to specific problems or objectives
- F02D2250/32—Air-fuel ratio control in a diesel engine
Abstract
The invention discloses a control method of air-fuel ratio of a marine low-pressure dual-fuel host, which is characterized by comprising the following steps: in a main engine gas operation mode, a main engine control unit collects feedback signals of a gas injection valve and a waste gas bypass valve, calculates the actual air-fuel ratio in a cylinder according to the feedback scavenging pressure, the gas supply pressure and the opening time of the gas injection valve, compares the actual air-fuel ratio with a set value in the main engine control unit, and judges whether the actual air-fuel ratio is in a safe range; if the actual air-fuel ratio is not within the safe range, the host control unit controls and adjusts the requirement that the actual air-fuel ratio reaches the safe range of the set value by adjusting the opening degree of the wastegate valve, or adjusting the supply pressure and/or the opening duration of the gas injection valve. The invention realizes the accurate real-time control of the actual air-fuel ratio, effectively avoids the occurrence of knocking or flameout in the cylinder, improves the stability of the gas mode operation of the host, prolongs the service life of parts and components and has the advantage of wide adjustable range.
Description
Technical Field
The invention relates to a low-pressure air inlet dual-fuel host machine for a ship, in particular to a method for controlling the air-fuel ratio of the low-pressure dual-fuel host machine for the ship, and belongs to the technical field of diesel engines for the ship.
Background
The existing marine low-pressure air intake dual-fuel host machine adopts an Otto cycle combustion mode, the safe operation range of the air-fuel ratio is narrow when the gas of the host machine runs at high load, the host machine is easy to knock when the air-fuel ratio is low, and the host machine is easy to extinguish when the air-fuel ratio is high. When the environmental conditions change, the main engine scavenging amount changes, and the air-fuel ratio fluctuation is large. For example, the ambient temperature in winter is low, the scavenging air amount is relatively increased, the air-fuel ratio is increased, and the probability of flameout in the cylinder of the main engine is increased; in summer, the ambient temperature is high, the scavenging air amount is relatively reduced, the air-fuel ratio is reduced, and the probability of knocking of the main engine is increased.
Disclosure of Invention
The invention aims to overcome the defects in the prior art and provide a control method of the air-fuel ratio of a marine low-pressure dual-fuel main engine, when the operating environment condition of the main engine changes, the actual air-fuel ratio in the main engine cylinder is maintained in a safe and stable range by adjusting the waste gas bypass quantity of a supercharger and the fuel gas supply quantity of the cylinder, so that knocking or flameout in the marine dual-fuel main engine cylinder is effectively prevented, and the stability of a dual-fuel engine during high-load fuel gas operation is improved.
The purpose of the invention is realized by the following technical scheme:
a control method for the air-fuel ratio of a marine low-pressure dual-fuel host comprises a host control unit, a supercharger, a fuel gas injection valve and a waste gas bypass valve, wherein the waste gas bypass valve is arranged at the turbine end of the supercharger, and is characterized in that: in a main engine gas operation mode, the main engine control unit collects feedback signals of the gas injection valve and the waste gas bypass valve, calculates the actual air-fuel ratio in the cylinder according to the feedback scavenging pressure, the gas supply pressure and the opening time of the gas injection valve, compares the actual air-fuel ratio with a set value in the main engine control unit, and judges whether the actual air-fuel ratio is in a safe range; if the actual air-fuel ratio is not within the safe range, the host control unit controls and adjusts the requirement that the actual air-fuel ratio reaches the safe range of the set value by adjusting the opening degree of the wastegate valve, or adjusting the supply pressure and/or the opening duration of the gas injection valve.
As a further improvement, the main engine control unit controls the actuator of the waste gate valve to adjust the opening of the waste gate valve so as to adjust the effective work of the turbine and further achieve the purpose of controlling the scavenging amount.
As a further improvement, the main engine control unit is operative to control the amount of gas injected into the cylinder by adjusting the supply pressure and the duration of opening of the gas injection valve.
As a further improvement, the matching of the supercharger and the marine low-pressure dual-fuel main engine adopts a rich design, namely the supercharger adopts the optimal configuration of elements to achieve the highest TC efficiency, so that the scavenging air quantity of the marine low-pressure dual-fuel main engine has a sufficient upper limit margin.
As a further improvement, when the actual air-fuel ratio in the cylinder does not satisfy the requirement of the set value, the main engine control unit preferentially adjusts the opening degree of the wastegate valve to adjust the actual air-fuel ratio, and when the opening degree of the wastegate valve does not satisfy the requirement even when the upper limit or the lower limit is reached, the main engine control unit controls the gas injection amount to satisfy the adjustment requirement by adjusting the supply pressure and the opening duration of the gas injection valve.
Compared with the prior art, the invention has the beneficial effects that:
according to the control method, the accurate real-time control of the actual air-fuel ratio in the cylinder is realized through the feedback control of the exhaust gas bypass quantity of the supercharger and the gas supply quantity of the cylinder, the occurrence of knocking or flameout in the cylinder of the host is effectively avoided, the stability of the marine dual-fuel host during gas mode operation is improved, and the service life of relevant parts in the combustion chamber is prolonged; the invention adopts a combined control mode of the opening of the waste gas bypass valve and the fuel gas supply amount, so that the adjustable range of the air-fuel ratio is wider.
Drawings
Fig. 1 is a control schematic of the present invention.
Fig. 2 is a control flow diagram of the present invention.
In the figure:
ECU-host control unit, 101-gas injection valve, 102-waste gate valve.
Detailed Description
The following detailed description of the preferred embodiments of the present invention is provided for better understanding of the present invention with reference to the drawings, but the present invention should not be construed as being limited to the scope of the present invention.
The invention is used for controlling the air-fuel ratio of a low-pressure dual-fuel host for a ship, and is a control method for effectively adjusting the air-fuel ratio in a host cylinder by controlling the bypass flux of exhaust gas of a supercharger and the fuel gas supply amount of a cylinder in a closed loop manner.
As shown in fig. 1, the main components involved in the control of the present invention include a gas injection valve 101 and a wastegate valve 102 installed at the turbine end of the supercharger. The waste gas bypass valve 102 can adjust the opening thereof through an actuator thereof, so that waste gas is bypassed without flowing through the turbine, and the effective work done by the turbine can be effectively controlled by adjusting the opening of the waste gas bypass valve 102, thereby achieving the purpose of controlling the scavenging amount; by controlling the supply pressure of the gas injection valve 101 and the duration of the valve opening, the amount of gas injected into the cylinder can be effectively controlled.
The main engine control unit ECU calculates the actual air-fuel ratio in the cylinder by collecting feedback signals of the gas injection valve 101 and the waste gate valve 102, compares the actual air-fuel ratio with an internally set Offset + Scale value, and judges whether the actual air-fuel ratio is within a safety range or not; if not, the opening of the wastegate valve 102 is adjusted by controlling the actuator of the wastegate valve 102, or the supply pressure/opening duration of the gas injection valve 101 is controlled to achieve the design requirement.
The main engine control unit ECU calculates an actual air-fuel ratio in the cylinder based on the scavenging pressure, the gas supply pressure, and the opening time of the gas injection valve 101, and determines whether the calculated actual air-fuel ratio is within a safe range by comparing the calculated actual air-fuel ratio with a set value in the main engine control unit ECU.
When the supercharger is matched with the main engine, the supercharger adopts a rich design, namely, the supercharger element adopts the optimal configuration to achieve the highest TC efficiency, so that the scavenging air quantity of the main engine has certain upper limit margin.
The wastegate valve 102 is a main control means that, when the in-cylinder air-fuel ratio does not satisfy a demand, the opening degree of the wastegate valve 102 is preferentially adjusted to adjust the air-fuel ratio, and when the opening degree of the wastegate valve 102 reaches the upper limit/lower limit, the fuel gas supply amount is adjusted to satisfy the design demand.
As shown in fig. 2, the specific working flow of the present invention is as follows:
when the main engine gas mode is operated, the main engine control unit ECU monitors and calculates the actual air-fuel ratio of the main engine in the current working state through scavenging pressure and gas injection quantity, and compares the actual air-fuel ratio with an internal preset value, when the environmental condition changes and the actual air-fuel ratio deviates from the safety range of the preset value, the main engine control unit ECU preferentially controls an actuator of the waste gate valve 102 to adjust the opening of the waste gate valve 102 so as to adjust the actual air-fuel ratio; when the actual air-fuel ratio still cannot meet the requirement when the opening degree of the wastegate valve 102 reaches the upper limit or the lower limit, the main engine control unit ECU controls the gas injection amount through the gas injection valve 101 until the requirement of the preset air-fuel ratio value is reached.
The invention discloses a control method of air-fuel ratio of a marine low-pressure dual-fuel host, which accurately controls the air-fuel ratio in a cylinder through feedback control of exhaust gas bypass quantity and fuel gas supply quantity of a supercharger, and reduces the occurrence probability of fire/knock in the cylinder when the environmental condition is changed, thereby prolonging the service life of relevant parts of a combustion chamber, such as a piston head, an oil nozzle, an exhaust valve and the like, reducing the maintenance cost of the host, and improving the stability of the marine dual-fuel host during gas mode operation.
The above description is only a preferred embodiment of the present invention, and it should be noted that various equivalent modifications, changes and adaptations made by those skilled in the art according to the present invention shall be considered to be within the scope of the present invention.
Claims (5)
1. A control method for the air-fuel ratio of a marine low-pressure dual-fuel host comprises a host control unit, a supercharger, a fuel gas injection valve and a waste gas bypass valve, wherein the waste gas bypass valve is arranged at the turbine end of the supercharger, and is characterized in that: in a main engine gas operation mode, the main engine control unit collects feedback signals of the gas injection valve and the waste gas bypass valve, calculates the actual air-fuel ratio in the cylinder according to the feedback scavenging pressure, the gas supply pressure and the opening time of the gas injection valve, compares the actual air-fuel ratio with a set value in the main engine control unit, and judges whether the actual air-fuel ratio is in a safe range; if the actual air-fuel ratio is not within the safe range, the host control unit controls and adjusts the requirement that the actual air-fuel ratio reaches the safe range of the set value by adjusting the opening degree of the wastegate valve, or adjusting the supply pressure and/or the opening duration of the gas injection valve.
2. The control method of the air-fuel ratio of the marine low-pressure dual-fuel main engine according to claim 1, characterized in that: the main machine control unit adjusts the opening of the waste gas bypass valve by controlling an actuator of the waste gas bypass valve so as to adjust the effective work done by the turbine and further achieve the purpose of controlling the scavenging amount.
3. The control method of the air-fuel ratio of the marine low-pressure dual-fuel main engine according to claim 1, characterized in that: the main machine control unit effectively controls the gas quantity injected into the cylinder by adjusting the supply pressure and the opening duration of the gas injection valve.
4. The control method of the air-fuel ratio of the marine low-pressure dual-fuel main engine according to claim 1, characterized in that: the supercharger is matched with the marine low-pressure dual-fuel main engine by adopting a rich design, namely the supercharger adopts the optimal configuration of elements to achieve the highest TC efficiency, so that the scavenging air quantity of the marine low-pressure dual-fuel main engine has sufficient upper limit margin.
5. The control method of the air-fuel ratio of the marine low-pressure dual-fuel main engine according to claim 1, characterized in that: when the actual air-fuel ratio in the cylinder does not meet the requirement of the set value, the main engine control unit adjusts the actual air-fuel ratio by preferentially adjusting the opening degree of the waste gate valve, and when the opening degree of the waste gate valve does not meet the requirement even when the upper limit or the lower limit is reached, the main engine control unit controls the gas injection amount by adjusting the supply pressure and the opening duration of the gas injection valve to meet the adjustment requirement.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110663969.7A CN113623079A (en) | 2021-06-16 | 2021-06-16 | Control method for air-fuel ratio of low-pressure dual-fuel host for ship |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110663969.7A CN113623079A (en) | 2021-06-16 | 2021-06-16 | Control method for air-fuel ratio of low-pressure dual-fuel host for ship |
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| Publication Number | Publication Date |
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| CN113623079A true CN113623079A (en) | 2021-11-09 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202110663969.7A Pending CN113623079A (en) | 2021-06-16 | 2021-06-16 | Control method for air-fuel ratio of low-pressure dual-fuel host for ship |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115142967A (en) * | 2022-05-27 | 2022-10-04 | 河南柴油机重工有限责任公司 | Control device and method for gas fuel internal combustion engine |
| CN115370498A (en) * | 2022-08-31 | 2022-11-22 | 上海中船三井造船柴油机有限公司 | Cylinder pressure control method of marine dual-fuel low-speed engine |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| JP2002004903A (en) * | 2000-06-16 | 2002-01-09 | Mitsubishi Motors Corp | Engine with supercharger |
| JP2004124744A (en) * | 2002-09-30 | 2004-04-22 | Mazda Motor Corp | Turbocharged engine |
| CN103140659A (en) * | 2010-10-13 | 2013-06-05 | 丰田自动车株式会社 | Device for controlling internal combustion engine |
| CN107387238A (en) * | 2017-09-15 | 2017-11-24 | 河南柴油机重工有限责任公司 | A kind of diesel gas bifuel system and control method |
| CN109611228A (en) * | 2017-10-04 | 2019-04-12 | 本田技研工业株式会社 | The control device of internal combustion engine |
| CN109915266A (en) * | 2019-04-26 | 2019-06-21 | 上海海事大学 | A kind of dual-fuel engine combustion system peculiar to vessel and method |
-
2021
- 2021-06-16 CN CN202110663969.7A patent/CN113623079A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2002004903A (en) * | 2000-06-16 | 2002-01-09 | Mitsubishi Motors Corp | Engine with supercharger |
| JP2004124744A (en) * | 2002-09-30 | 2004-04-22 | Mazda Motor Corp | Turbocharged engine |
| CN103140659A (en) * | 2010-10-13 | 2013-06-05 | 丰田自动车株式会社 | Device for controlling internal combustion engine |
| CN107387238A (en) * | 2017-09-15 | 2017-11-24 | 河南柴油机重工有限责任公司 | A kind of diesel gas bifuel system and control method |
| CN109611228A (en) * | 2017-10-04 | 2019-04-12 | 本田技研工业株式会社 | The control device of internal combustion engine |
| CN109915266A (en) * | 2019-04-26 | 2019-06-21 | 上海海事大学 | A kind of dual-fuel engine combustion system peculiar to vessel and method |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115142967A (en) * | 2022-05-27 | 2022-10-04 | 河南柴油机重工有限责任公司 | Control device and method for gas fuel internal combustion engine |
| CN115142967B (en) * | 2022-05-27 | 2023-10-10 | 河南柴油机重工有限责任公司 | Control device and method for gas fuel internal combustion engine |
| CN115370498A (en) * | 2022-08-31 | 2022-11-22 | 上海中船三井造船柴油机有限公司 | Cylinder pressure control method of marine dual-fuel low-speed engine |
| CN115370498B (en) * | 2022-08-31 | 2024-04-05 | 上海中船三井造船柴油机有限公司 | Cylinder pressure control method of marine dual-fuel low-speed engine |
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Application publication date: 20211109 |
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