CN113123890A - double-ECU high-pressure common rail fuel control system and method for highly-intensified diesel engine - Google Patents
double-ECU high-pressure common rail fuel control system and method for highly-intensified diesel engine Download PDFInfo
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- CN113123890A CN113123890A CN202110493130.3A CN202110493130A CN113123890A CN 113123890 A CN113123890 A CN 113123890A CN 202110493130 A CN202110493130 A CN 202110493130A CN 113123890 A CN113123890 A CN 113123890A
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- diesel engine
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- common rail
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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
- F02D41/3809—Common rail control systems
- F02D41/3827—Common rail control systems for diesel engines
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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
- F02D41/3094—Controlling fuel injection the fuel injection being effected by at least two different injectors, e.g. one in the intake manifold and one in the cylinder
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Fuel-Injection Apparatus (AREA)
Abstract
The invention discloses a dual-ECU (electronic control unit) high-pressure common rail fuel control system and method for a high-intensity diesel engine, and belongs to the technical field of engines. The invention respectively adopts the main ECU and the auxiliary ECU to control the two oil injectors to inject high-pressure fuel oil to the same cylinder, compared with the single ECU, the invention more flexibly and reliably controls the pressure of the two sets of high-pressure common rail internal fuel oil, and improves the combustion and emission quality of the highly intensified diesel engine. The two oil injectors are used for providing fuel oil, so that the fuel oil supply required by high load can be completed within a short fuel injection duration, and the aging requirement of a highly-enhanced diesel engine on the fuel oil supply is met; meanwhile, the high-pressure fuel is used for injecting jet flow energy to organize airflow by matching and adjusting the installation angle of the main fuel injector and the auxiliary fuel injector, so that the fuel and the air in the cylinder are promoted to be mixed, and the high-strength diesel engine can burn well.
Description
Technical Field
The invention belongs to the technical field of engines, and particularly relates to a dual-ECU (electronic control unit) high-pressure common rail fuel control system and method for a highly-intensified diesel engine.
Background
With the innovation of scientific technology, the diesel engine is developed towards the direction of more efficient performance, stronger power and more compact structure, and the improvement of military strength of various countries is more and more important in the face of the change pattern of the world, so that the high-strength diesel engine is produced at the same time. Compared with a common diesel engine, the power density of the high-strength diesel engine is greatly improved, wherein the highest power of the high-strength diesel engine is close to 100kW/L, so that the high-strength diesel engine is widely applied to the field of military engines, particularly tank armored vehicles, and all countries in the world make efforts to develop high-power, small-volume, light-weight and high-strength diesel engines. In addition, in the field of civil engines, diesel engines are also rapidly developing in the direction of smaller displacement and higher power per liter.
The strengthening of the diesel engine can be realized by a plurality of key technical means such as increasing the air inflow of the engine cycle, improving the rotating speed of the engine and the fuel injection pressure. However, there are naturally some new problems arising at the same time as the degree of strengthening of the diesel engine is increased, such as:
the high-intensity diesel engine generally uses engine electric control high-pressure common rail oil injection in the aspect of a fuel injection system, the maximum fuel injection pressure can reach 200 MPa-300 MPa, although high-speed oil injection can obviously improve the oil atomization degree in a cylinder, so that the oil-gas mixing rate is increased, fuel can be caused to touch the wall under the condition of high probability, and the combustion and emission process of the engine is influenced.
Compared with the common diesel engine, the highly intensified diesel engine has the advantages that the rotating speed is high, the circulating fuel injection quantity is large, the piston moving speed is accelerated, the accumulated air inflow in the cylinder is increased rapidly, the mixing time of high-pressure injection fuel oil and air is shortened greatly, and meanwhile, the highly intensified diesel engine is required to completely burn 40% more fuel oil than the common diesel engine in a shorter (about half) combustion duration, so that the formation of combustible mixed gas in the cylinder and the combustion heat release process are more difficult to organize.
Therefore, aiming at the characteristics of the highly intensified diesel engine, how to control fuel to realize rapid combustion has important significance for further improving the intensified degree of the diesel engine.
Disclosure of Invention
Aiming at the defects or the improvement requirements of the prior art, the invention provides a dual-ECU high-pressure common rail fuel control system and a dual-ECU high-pressure common rail fuel control method for a highly intensified diesel engine, and aims to improve the fuel combustion quality while ensuring the fuel supply quantity aiming at the requirements of the highly intensified diesel engine.
In order to achieve the aim, the invention provides a double-ECU high-pressure common rail fuel oil control system for a high-intensity diesel engine, which comprises a main ECU, an auxiliary ECU, a main oil injector, an auxiliary oil injector, a main high-pressure common rail module and an auxiliary high-pressure common rail module;
the main ECU is electrically connected with the main oil injector and the main high-pressure common rail module; the auxiliary ECU is electrically connected with the auxiliary oil injector and the auxiliary high-pressure common rail module; the main ECU is connected with the auxiliary ECU through a CAN bus;
under the working conditions of diesel engine starting and low and medium load, the main ECU is used for controlling the main oil injector and the main high-pressure common rail module to perform fuel oil supply control according to the working mode of the conventional high-pressure common rail diesel engine;
under the high-load working condition of the diesel engine, the main ECU sends an instruction to the auxiliary ECU to start the auxiliary ECU, and the auxiliary ECU controls the auxiliary oil injector and the auxiliary high-pressure common rail module to be matched with the main ECU to supply extra fuel.
Further, the installation angles of the main oil injector and the auxiliary oil injector are matched and adjusted according to requirements.
Further, the main oil injector is vertically arranged in the central position area of the cylinder cover, and the installation inclination angle of the auxiliary oil injector is 30-60 degrees.
Further, the high load condition refers to more than 70% of the maximum load.
Further, when the auxiliary ECU is started, the auxiliary fuel injector is controlled to inject extra fuel into the cylinder according to the MAP.
And further, the MAP is obtained by drawing according to the oil injection quantity of the auxiliary oil injection system calibrated under different high-load working conditions.
Further, the opening time of the main oil injector is 20-25 degrees before the top dead center, and the opening time of the auxiliary oil injector is 10-15 degrees before the top dead center.
In general, the above technical solutions contemplated by the present invention can achieve the following advantageous effects compared to the prior art.
The invention respectively adopts the main ECU and the auxiliary ECU to control the two oil injectors to provide fuel oil for the same cylinder, compared with the method of using a single ECU to carry out high-pressure common rail oil injection, the work of the high-intensity diesel engine is more flexible and reliable, the auxiliary ECU auxiliary oil injector is started to carry out additional fuel supply under the high-load working condition, the fuel oil is prevented from colliding the wall, and the combustion and emission quality of the engine is improved.
The invention adopts two oil injectors to provide fuel oil, can finish fuel oil supply in a short time, and meets the aging requirement of the high-pressure diesel engine on the fuel oil supply; meanwhile, the high-pressure fuel is used for injecting jet flow energy to organize airflow by matching and adjusting the installation angle of the main fuel injector and the auxiliary fuel injector, so that the fuel and the air in the cylinder are promoted to be mixed, and the high-strength diesel engine can burn well.
Drawings
FIG. 1 is a structural diagram of a dual ECU high-pressure common rail fuel control system for a highly intensified diesel engine provided by the invention;
1-coarse filter; 2-an oil tank; 3, 16-oil transfer pump; 4, 15-fine filter; 5, 14-high pressure fuel pump; 6, 13-oil pressure control valve; 7, 12-common rail pressure sensor; 8, 11-high pressure fuel common rail; 9-main oil sprayer; 10-secondary fuel injector; 17-cylinder.
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. In addition, the technical features involved in the embodiments of the present invention described below may be combined with each other as long as they do not conflict with each other.
The high-pressure common rail fuel control system provided by the invention comprises a main ECU, an auxiliary ECU, a main fuel injector 9, an auxiliary fuel injector 10, a main high-pressure common rail module and an auxiliary high-pressure common rail module. The system can be used for single-cylinder or multi-cylinder diesel engines;
the main ECU is electrically connected with a main oil injector and a main high-pressure common rail module (oil pressure control valves 6,13, common rail pressure sensors 7, 12); the auxiliary ECU is electrically connected with the auxiliary fuel injector and an auxiliary high-pressure common rail module (a hydraulic control valve and a common rail pressure sensor); the main ECU is connected with the auxiliary ECU through a CAN bus; the main ECU controller and the auxiliary ECU controller simultaneously acquire engine working signals of the diesel engine, such as the rotating speed, the throttle position, the cooling water temperature and the like. The main ECU and the auxiliary ECU respectively and independently and flexibly control the rail pressure of two sets of high-pressure common rail systems: 2-the fuel in the fuel tank enters the high-pressure fuel common rails 8 and 11 through the coarse filter 1, the fuel delivery pumps 3 and 16, the fine filters 4 and 15 and the high- pressure fuel pumps 5 and 14; the main ECU and the auxiliary ECU respectively perform feedback regulation on the opening of the high-pressure fuel pump according to the measured values of the common rail pressure sensors 7 and 12, and stabilize the fuel pressure of the two high-pressure rails as a set value; the pressure of the two oil pipes can be kept consistent, and the two oil pipes can also be controlled to work under different pressures. Generally, the main common rail pressure is 200MPa to 300MPa, and the auxiliary common rail pressure is about 200 MPa. The main oil injector and the auxiliary oil injector are arranged in a cylinder cover and directly inject fuel oil to the 17-cylinder. The mounting angles of the main oil sprayer and the auxiliary oil sprayer can be matched and adjusted with each other, the main oil sprayer is vertically mounted near the center of a cylinder cover, and the mounting inclination angle of the auxiliary oil sprayer is 30-60 degrees; the jet energy of the high-pressure fuel injection is utilized to organize airflow, so that the fuel-air mixing in the cylinder is promoted, and the good combustion of the high-strength diesel engine is realized.
The dual ECU control system operates in a master-slave mode:
the main ECU controls the auxiliary ECU to start or stop oil injection, and the auxiliary ECU controls the auxiliary oil injector to inject oil according to the oil injection quantity in the MAP, so that the reliability of highly-enhanced diesel engine fuel supply is ensured. Under the working condition of starting or medium and low load, the main ECU performs fuel supply control according to the working mode of a conventional high-pressure common rail diesel engine;
under the condition of high load (greater than 70% of the maximum load), the main ECU sends an instruction to the auxiliary ECU through the CAN bus, and the auxiliary ECU receives a mark for enabling the starting work in a program after the instruction. When the starting operation mark in the auxiliary ECU is 'yes', the program controls the auxiliary fuel injector to inject additional fuel into the cylinder according to the requirement (MAP). And when the load is less than 70% of the highest load, the main ECU sends a work stopping instruction to the auxiliary ECU through the CAN bus, the auxiliary ECU resets a work starting mark in the program after receiving the instruction, and the program controls the auxiliary fuel injector to stop fuel injection.
Through calculation and test, the oil injection quantity of the auxiliary oil injection system under different high-load working conditions (the rotating speed of the diesel engine, the position of an accelerator and the like) is calibrated, an oil injection quantity control MAP (MAP) diagram of the auxiliary oil injector is drawn and stored in the auxiliary ECU. In order to avoid detonation pressure and over-high pressure rise rate, the opening time of the main oil injector is 20-25 degrees before the top dead center, and the opening time of the auxiliary oil injector is 10-15 degrees before the top dead center.
It will be understood by those skilled in the art that the foregoing is only a preferred embodiment of the present invention, and is not intended to limit the invention, and that any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the scope of the present invention.
Claims (8)
1. A double-ECU high-pressure common rail fuel oil control system for a highly intensified diesel engine is characterized by comprising a main ECU, an auxiliary ECU, a main oil injector, an auxiliary oil injector, a main high-pressure common rail module and an auxiliary high-pressure common rail module;
the main ECU is electrically connected with the main oil injector and the main high-pressure common rail module; the auxiliary ECU is electrically connected with the auxiliary oil injector and the auxiliary high-pressure common rail module; the main ECU is connected with the auxiliary ECU through a CAN bus;
under the working conditions of diesel engine starting and low and medium load, the main ECU is used for controlling the main oil injector and the main high-pressure common rail module to perform fuel oil supply control according to the working mode of the conventional high-pressure common rail diesel engine;
under the high-load working condition of the diesel engine, the main ECU sends an instruction to the auxiliary ECU to start the auxiliary ECU, and the auxiliary ECU controls the auxiliary oil injector and the auxiliary high-pressure common rail module to be matched with the main ECU to supply extra fuel.
2. The dual-ECU high-pressure common rail fuel control system for the highly intensified diesel engine as claimed in claim 1, wherein the installation angles of the main fuel injector and the auxiliary fuel injector are matched and adjusted according to requirements.
3. The dual-ECU high-pressure common rail fuel oil control system for the highly intensified diesel engine as claimed in claim 2, wherein the main injector is vertically installed in the central position area of the cylinder cover, and the installation inclination angle of the auxiliary injector is 30-60 °.
4. The dual-ECU high pressure common rail fuel control system for the highly intensified diesel engine as claimed in claim 1, wherein the high load condition is greater than 70% of the maximum load.
5. The dual-ECU high pressure common rail fuel control system for the highly intensified diesel engine according to any one of claims 1-4, characterized in that the sub-ECU controls the sub-injector to inject extra fuel into the cylinder according to a MAP when starting.
6. The dual-ECU high-pressure common rail fuel control system for the highly-intensified diesel engine as claimed in claim 5, wherein the MAP is obtained by plotting the fuel injection quantity of the auxiliary fuel injection system calibrated under different high-load conditions.
7. The dual-ECU high-pressure common rail fuel oil control system for the highly intensified diesel engine according to claims 1-6, characterized in that the opening time of the main oil injector is 20-25 degrees before the top dead center, and the opening time of the auxiliary oil injector is 10-15 degrees before the top dead center
8. A diesel engine control method based on the control system according to any one of claims 1 to 7, characterized by comprising:
s1, collecting an engine working signal and judging the current working condition of a diesel engine;
s2, under the working conditions of diesel engine starting and low and medium load, controlling a main oil injector and a main high-pressure common rail module by using a main ECU to perform fuel oil supply control according to the working mode of a conventional high-pressure common rail diesel engine;
under the high-load working condition of the diesel engine, the main ECU sends an instruction to the auxiliary ECU to start the auxiliary ECU, and the auxiliary ECU controls the auxiliary oil injector and the auxiliary high-pressure common rail module to be matched with the main ECU to supply extra fuel.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110493130.3A CN113123890A (en) | 2021-05-07 | 2021-05-07 | double-ECU high-pressure common rail fuel control system and method for highly-intensified diesel engine |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110493130.3A CN113123890A (en) | 2021-05-07 | 2021-05-07 | double-ECU high-pressure common rail fuel control system and method for highly-intensified diesel engine |
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| CN113123890A true CN113123890A (en) | 2021-07-16 |
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| CN202110493130.3A Pending CN113123890A (en) | 2021-05-07 | 2021-05-07 | double-ECU high-pressure common rail fuel control system and method for highly-intensified diesel engine |
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2021
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| JP2002161821A (en) * | 2000-11-29 | 2002-06-07 | Toyota Motor Corp | Fuel system for internal combustion engine |
| US20040168673A1 (en) * | 2003-02-28 | 2004-09-02 | Shinogle Ronald D. | Fuel injection system including two common rails for injecting fuel at two independently controlled pressures |
| CN1621678A (en) * | 2003-11-28 | 2005-06-01 | 株式会社电装 | Fuel injection device having two separate common rails |
| KR101073634B1 (en) * | 2007-05-29 | 2011-10-18 | 맨 디젤 앤드 터보 필리얼 아프 맨 디젤 앤드 터보 에스이 티스크랜드 | Fuel injection system for large two-stroke diesel engine |
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Application publication date: 20210716 |