CN113339151B - Engine mixed injection control system and method for engine bench test - Google Patents
Engine mixed injection control system and method for engine bench test Download PDFInfo
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- CN113339151B CN113339151B CN202110596297.2A CN202110596297A CN113339151B CN 113339151 B CN113339151 B CN 113339151B CN 202110596297 A CN202110596297 A CN 202110596297A CN 113339151 B CN113339151 B CN 113339151B
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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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- 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
- F02D41/009—Electrical control of supply of combustible mixture or its constituents using means for generating position or synchronisation signals
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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
- F02D41/0097—Electrical control of supply of combustible mixture or its constituents using means for generating speed signals
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M15/00—Testing of engines
- G01M15/04—Testing internal-combustion engines
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/10—Internal combustion engine [ICE] based vehicles
- Y02T10/40—Engine management systems
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Combined Controls Of Internal Combustion Engines (AREA)
Abstract
The embodiment of the invention provides an engine mixed injection control system and method for an engine bench test, wherein the system comprises a GDI engine system and a PFI control system; the GDI engine system includes: the device comprises a GDI engine, a first engine controller with a GDI oil injection control chip, a sensor and a GDI actuator; the PFI control system includes: the upper computer is connected with the second engine controller, the PFI oil sprayer and a sensor in a GDI engine system through a universal electric control load box.
Description
Technical Field
The invention belongs to the field of fuel injection control of automobile engines, and particularly relates to an engine mixed injection control system and method for an engine bench test.
Background
In the field of control of current automobile engines, a GDI (direct injection in gasoline cylinders) + PFI (nozzle fuel injection) dual-injection control technology is developed on the basis of oil injection control of a traditional GDI engine so as to realize control of a GDI oil injection system and a PFI oil injection system under different working conditions and different working cycles (GDI or PFI can be independently adopted in one working cycle, and GDI and PFI can be simultaneously controlled). In order to implement the above control method, the related art in the prior art is mainly divided into three methods: the GDI + PFI cooperative control is realized through EMS software bottom development; secondly, ECU hardware is developed, and oil injection chips with GDI and PFI are needed to support driving of two kinds of oil injection; and thirdly, related parts, such as a high-pressure oil pump of a high-pressure oil injection system, a low-pressure oil rail of a low-pressure oil injection system and the like, are developed, and compared with the common high-pressure oil pump, a low-pressure fixing (for leading to an oil inlet of the low-pressure oil rail) is additionally added.
In order to further reduce the particulate matter emission of the engine and solve the problem of high particulate matter emission when the engine works in a high-load area, the engine bench test needs to be performed on the technology of performing double-injection control by adopting the three modes. The prior art has the defects that in order to carry out bench tests on the engine dual-injection control technology, the engine bench tests are carried out by adopting the three modes, and additional software and hardware development is needed, so that the development cost of software and hardware is very high, and the development period is very long.
Disclosure of Invention
The invention aims to provide an engine mixed injection control system and method for an engine bench test by using general equipment, which can control an engine to realize the mixed injection control of GDI (gasoline direct injection) injection and PFI (gasoline direct injection) injection under different working conditions and different working cycles in the bench test stage (GDI or PFI can be independently adopted in one working cycle, and GDI and PFI can be simultaneously controlled), provide a simple and convenient control mode for further reducing the particulate matter emission and solving the problem of high particulate matter emission in a high-load area, and solve the problems of high software and hardware development cost and long development period in a conventional development mode.
The invention adopts the following technical scheme:
the embodiment of the invention provides an engine mixed injection control system for an engine bench test, which comprises a GDI engine system and a PFI control system;
the GDI engine system includes: the device comprises a GDI engine, a first engine controller with a GDI oil injection control chip, a sensor and a GDI actuator;
the PFI control system includes: the upper computer is connected with sensors in the second engine controller, the PFI oil sprayer and the GDI engine system through a universal electric control load box;
after the engine mixed injection system is built and started, the first engine controller firstly controls the GDI actuator to inject oil to the GDI engine according to preset initial oil injection parameters; meanwhile, the upper computer sends a control signal to the PFI oil sprayer to enable the PFI oil sprayer not to spray oil to the GDI engine;
the second engine controller is used for judging cylinders according to signals of the sensors; enabling the upper computer to determine a first target oil injection parameter required by the PFI oil injector based on the cylinder judgment result; the upper computer sends an output oil injection driving signal carrying the first target oil injection parameter to the PFI oil injector so that the PFI oil injector injects oil to the GDI engine according to the first target oil injection parameter;
and after the PFI oil injector injects oil to the GDI engine, the first engine controller determines a second target oil injection parameter required by the GDI actuator according to a signal of the sensor, outputs an oil injection driving signal carrying the second target oil injection parameter to the GDI actuator and enables the GDI actuator to inject oil according to the second target oil injection parameter.
Preferably, the sensors include a crankshaft speed sensor and a camshaft speed sensor.
Preferably, the upper computer determines the corresponding oil injection pulse width and oil injection time under the current engine rotating speed and load working condition based on the pre-stored cylinder judgment result and the preset corresponding relation between the oil injection pulse width and the oil injection time under different engine rotating speeds and load working conditions.
The embodiment of the invention also provides an engine mixed injection control method for the engine bench test, which is applied to the engine mixed injection control system for the engine bench test, and after the engine mixed injection system is built and started, the method comprises the following steps:
step S101, after the engine mixed injection system is built and started, the first engine controller firstly controls the GDI actuator to inject oil to the GDI engine according to preset initial oil injection parameters; meanwhile, the upper computer sends a control signal to the PFI oil sprayer to enable the PFI oil sprayer not to spray oil to the GDI engine;
step S102, the second engine controller is used for judging a cylinder according to the signal of the sensor; enabling the upper computer to determine a first target oil injection parameter required by the PFI oil injector based on the cylinder judgment result; the upper computer sends an output oil injection driving signal carrying the first target oil injection parameter to the PFI oil injector so that the PFI oil injector injects oil to the GDI engine according to the first target oil injection parameter;
step S103, after the PFI oil injector injects oil to the GDI engine, the first engine controller determines a second target oil injection parameter required by the GDI actuator according to a signal of the sensor, and outputs an oil injection driving signal carrying the second target oil injection parameter to the GDI actuator so that the GDI actuator injects oil to the GDI engine according to the second target oil injection parameter;
step S102 and step S103 are repeatedly executed until the engine mount test is stopped.
Preferably, in step S102: and the upper computer determines the corresponding oil injection pulse width and oil injection time under the current engine rotating speed and load working condition based on the pre-stored cylinder judgment result and the preset corresponding relation of the oil injection pulse width and the oil injection time under different engine rotating speeds and load working conditions.
The invention has the beneficial effects that:
the engine mixed injection control system and method for the engine bench test are provided by using general equipment, the engine can be controlled in the bench test stage to realize the mixed injection control of GDI (gasoline direct injection) injection and PFI (gasoline direct injection) injection under different working conditions and different working cycles (the GDI or the PFI can be independently adopted in one working cycle, and the GDI and the PFI can be simultaneously controlled), a simple and convenient control mode is provided for researching to further reduce the particulate matter emission and solving the problem of high particulate matter emission in a high-load area, and the problems of conventional development mode software, high hardware development cost and long development period are solved.
Drawings
FIG. 1 is a diagram of a prior art system control scheme;
FIG. 2 is a schematic diagram of the system of the present invention;
FIG. 3 is a system technology flow diagram of the present invention.
Detailed Description
The invention provides a control method for GDI + PFI mixed injection of an engine by utilizing general equipment, which can control the engine to realize the control of a GDI oil injection system and a PFI oil injection system under different working conditions and different working cycles (GDI or PFI can be independently adopted in one working cycle, and GDI and PFI can be simultaneously controlled).
Referring to fig. 2, in the present embodiment, there is provided a control system for implementing GDI + PFI mixed injection of an engine in an engine bench test by using general-purpose equipment, including:
the system comprises a set of GDI engine system (comprising a first engine controller (the first engine controller is provided with a GDI oil injection control chip) 1, a GDI engine 2, a GDI actuator 8, a sensor 7 and the like), a set of PFI control system (comprising a set of second engine controller (the second engine controller is provided with a PFI oil injection control chip) 3, a set of universal electric control load box 4, a set of PFI oil injector 5 and an upper computer 6 with automobile calibration software INCA).
In this embodiment, on the basis of the existing system control technical scheme, the following features are added:
a crankshaft rotating speed signal and a camshaft rotating speed signal of the GDI system are led out from a sensor signal end of the existing GDI engine system, and the two signals are led into a universal electric control load box 4; the output end of a second engine controller (provided with a PFI oil injection control chip) 3 is connected with a universal electric control load box 4; connecting an upper computer 6 with a universal electrical control load box 4, and connecting a second engine controller 3 for controlling a peripheral PFI engine system; one end of a wiring harness of the PFI oil sprayer 5 is connected to the universal electric control load box 4, and one end of the PFI oil sprayer 5 is led into the GDI engine 2.
The second engine controller 3 realizes cylinder judgment (the specific process of cylinder judgment is the prior art) by receiving signals of the crankshaft rotation speed and the camshaft rotation speed, so that the upper computer calculates a second target injection parameter of the PFI injector for injecting oil to the GDI engine based on the cylinder judgment result.
Specifically, the upper computer determines the corresponding oil injection pulse width and oil injection time under the current engine rotating speed and load working condition based on the pre-stored cylinder judgment result and the preset corresponding relation between the oil injection pulse width and the oil injection time under different engine rotating speeds and load working conditions. In this embodiment, the injection pulse width and the injection time are the second target injection parameters.
The upper computer 6 sends an oil injection driving signal containing the second oil injection parameter to the PFI oil injector 5, controls the PFI oil injector 5 to act, and injects fuel oil into the GDI engine 2.
After the fuel oil is sprayed into the GDI engine 2 by the PFI controller 5, the crankshaft rotating speed signal and the camshaft rotating speed signal collected by the sensor can be changed, the first engine controller 1 obtains a first target fuel injection parameter acting on the GDI actuator 8 through calculation (the calculation process is the prior art), then an oil injection driving signal carrying the first target fuel injection is output to control the GDI actuator 8 to inject the fuel oil into the GDI engine 2, and the coordinated fuel injection control of a GDI fuel injection system and a PFI fuel injection system is realized.
In the embodiment, the PFI engine control system software of the upper computer 6 is simply modified, the upper computer 6 is connected with the universal electrical control load box 4, and is indirectly connected with and controls the second engine controller 3 of the peripheral PFI engine system, so that the oil injection open-loop manual control is realized, that is, the oil injection quantity can be manually controlled, and the oil injection pulse width and the oil injection time are manually controlled.
In the embodiment of the invention, the specific control flow during the bench test is as follows:
s1, checking that a GDI engine system has no fault;
s2, building an engine mixed injection control system, which specifically comprises the following steps:
s21, leading out camshaft rotating speed and crankshaft rotating speed signals acquired by a sensor 7 of a GDI engine system by using an additional wire harness (note here that the connection position is stable, otherwise camshaft and crankshaft signals are lost), and accessing the led-out crankshaft rotating speed and camshaft rotating speed signals into a signal receiving control panel of a universal electric control load box 4 to serve as input signals of a PFI engine control system, so that the GDI engine control system and the PFI engine control system are in a synchronous state;
s22, a second engine controller 3 of the PFI engine system is connected to a universal electric control load box 4;
and S23, connecting the PFI oil injector 5 to each air inlet channel of the GDI engine 2, and introducing the wire harness end of the PFI oil injector 5 into an output signal control panel of the universal electric control load box 4.
S24, the upper computer 6 is connected with the universal electrical control load box 4, the oil injection pulse width of the PFI oil injector 5 is set to be 0 manually in the upper computer 6 (the purpose is to enable the PFI oil injector 5 not to inject oil to the GDI engine 2 at the beginning), and the upper computer 6 is indirectly connected with the second engine controller 3 which controls the PFI engine system through the electrical control load box 4.
And S3, checking that the built new engine mixed injection control system has no fault.
And S4, operating the whole engine mixed injection control system.
S5, oil injection open-loop manual control of the PFI engine system is achieved through the INCA software in the upper computer 6, oil injection pulse width and oil injection time are manually controlled to achieve PFI oil injection manual control, and GDI engine system racks are operated to achieve GDI oil injection.
S6, through the process, the engine can be simply controlled to realize control of the GDI oil injection system and the PFI oil injection system under different working conditions and different working cycles (for example, the GDI or the PFI can be independently adopted in one working cycle, and the GDI and the PFI can be simultaneously controlled).
According to the embodiment of the invention, the engine can be controlled in the stage of bench test to realize the mixed oil injection control of GDI oil injection and PFI oil injection under different working conditions and different working cycles (GDI or PFI can be independently adopted in one working cycle, and GDI and PFI can be simultaneously controlled), a simple and convenient control mode is provided for researching to further reduce the particulate matter emission and solving the problem of high particulate matter emission in a high-load area, and the problems of high software and hardware development cost and long development period in a conventional development mode are solved.
Claims (5)
1. An engine mixed injection control system for an engine bench test is characterized by comprising a GDI engine system and a PFI control system;
the GDI engine system includes: the device comprises a GDI engine (2), a first engine controller (1) with a GDI oil injection control chip, a sensor (7) and a GDI actuator (8);
the PFI control system includes: the engine control system comprises an upper computer (6), a second engine controller (3) with a PFI oil injection chip and a PFI oil injector (5), wherein the upper computer (6) is connected with the second engine controller (3) and the PFI oil injector (5) through a universal electric control load box (4) and a sensor (7) in a GDI engine system;
after the engine mixed injection system is built and started, the first engine controller (1) controls the GDI actuator (8) to inject oil to the GDI engine (2) according to preset initial oil injection parameters; meanwhile, the upper computer (6) sends a control signal to the PFI oil sprayer (5) to enable the PFI oil sprayer (5) not to spray oil to the GDI engine (2);
the second engine controller (3) is used for judging cylinders according to signals of the sensor (7); enabling the upper computer (6) to determine a first target oil injection parameter required by the PFI oil injector (5) based on a cylinder judgment result; the upper computer (6) sends an output oil injection driving signal carrying the first target oil injection parameter to the PFI oil injector (5) so as to inject oil to the GDI engine (2) according to the first target oil injection parameter;
after the PFI oil injector (5) injects oil to the GDI engine (2), the first engine controller (1) determines a second target oil injection parameter required by a GDI actuator (8) according to a signal of the sensor (7), outputs an oil injection driving signal carrying the second target oil injection parameter to the GDI actuator (8), and enables the GDI actuator (8) to inject oil according to the second target oil injection parameter and the GDI engine (2).
2. A system according to claim 1, characterized in that the sensor (7) comprises a crankshaft rotational speed sensor and a camshaft rotational speed sensor.
3. The system according to claim 1, characterized in that the upper computer (6) determines the corresponding injection pulse width and injection time under the current engine speed and load conditions based on the pre-stored cylinder judgment result and the preset corresponding relation of the injection pulse width and injection time under different engine speed and load conditions.
4. An engine mixed injection control method for an engine bench test, which is applied to the engine mixed injection control system for the engine bench test as claimed in any one of claims 1 to 3, and is characterized in that after the engine mixed injection system is built and started, the method comprises the following steps:
step S101, after the engine mixed injection system is built and started, the first engine controller (1) firstly controls the GDI actuator (8) to inject oil to the GDI engine (2) according to preset initial oil injection parameters; meanwhile, the upper computer (6) sends a control signal to the PFI oil sprayer (5) to enable the PFI oil sprayer (5) not to spray oil to the GDI engine (2);
step S102, the second engine controller (3) is used for judging cylinders according to signals of the sensor (7); enabling the upper computer (6) to determine a first target oil injection parameter required by the PFI oil injector (5) based on a cylinder judgment result; the upper computer (6) sends an output oil injection driving signal carrying the first target oil injection parameter to the PFI oil injector (5) so as to inject oil to the GDI engine (2) according to the first target oil injection parameter;
step S103, after the PFI oil injector (5) injects oil to the GDI engine (2), the first engine controller (1) determines a second target oil injection parameter required by the GDI actuator (8) according to a signal of the sensor (7), and the first engine controller (1) outputs an oil injection driving signal carrying the second target oil injection parameter to the GDI actuator (8) so that the GDI actuator (8) injects oil according to the second target oil injection parameter and the GDI engine (2);
the steps S102 and S103 are repeatedly executed until the engine mount test is stopped.
5. The method according to claim 4, wherein in step S102: and the upper computer (6) determines the corresponding oil injection pulse width and oil injection time under the current engine rotating speed and load working condition based on the pre-stored cylinder judgment result and the preset corresponding relation of the oil injection pulse width and the oil injection time under different engine rotating speeds and load working conditions.
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