CN112555079B - Methanol fuel engine and starting control method thereof - Google Patents
Methanol fuel engine and starting control method thereof Download PDFInfo
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- CN112555079B CN112555079B CN202011399144.0A CN202011399144A CN112555079B CN 112555079 B CN112555079 B CN 112555079B CN 202011399144 A CN202011399144 A CN 202011399144A CN 112555079 B CN112555079 B CN 112555079B
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02N—STARTING OF COMBUSTION ENGINES; STARTING AIDS FOR SUCH ENGINES, NOT OTHERWISE PROVIDED FOR
- F02N11/00—Starting of engines by means of electric motors
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D41/00—Electrical control of supply of combustible mixture or its constituents
- F02D41/30—Controlling fuel injection
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02N—STARTING OF COMBUSTION ENGINES; STARTING AIDS FOR SUCH ENGINES, NOT OTHERWISE PROVIDED FOR
- F02N11/00—Starting of engines by means of electric motors
- F02N11/10—Safety devices
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02N—STARTING OF COMBUSTION ENGINES; STARTING AIDS FOR SUCH ENGINES, NOT OTHERWISE PROVIDED FOR
- F02N11/00—Starting of engines by means of electric motors
- F02N11/10—Safety devices
- F02N11/108—Safety devices for diagnosis of the starter or its components
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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
- Y02T10/30—Use of alternative fuels, e.g. biofuels
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Electrical Control Of Air Or Fuel Supplied To Internal-Combustion Engine (AREA)
- Combined Controls Of Internal Combustion Engines (AREA)
- Output Control And Ontrol Of Special Type Engine (AREA)
Abstract
The invention discloses a methanol fuel engine and a starting control method thereof, wherein the methanol fuel engine comprises an air inlet main pipe, an air outlet main pipe and a plurality of air cylinders; one side of each cylinder is communicated with the air inlet main pipe through an air inlet manifold, and the other side of each cylinder is communicated with the air outlet main pipe through an air outlet manifold; the air inlet main pipe is provided with a first electric control three-way switching valve, the first electric control three-way switching valve comprises an inlet A, an outlet B and an outlet C, and the inlet A and the outlet B are connected in series with the air inlet main pipe; the exhaust main pipe is provided with a second electric control three-way switching valve, the second electric control three-way switching valve comprises an inlet D, an outlet E and an outlet F, and the inlet D and the outlet E are connected to the exhaust main pipe in series; a lapping pipe is connected between the outlet C and the outlet F. The methanol fuel engine of the invention has the following characteristics: 1. good cold start effect of the methanol fuel engine is realized without using additional equipment; 2. and automatically judging the cold start mode and starting the fully-closed circulating cold start.
Description
Technical Field
The invention relates to the field of engines, in particular to a methanol fuel engine and a starting control method thereof.
Background
Methanol fuel is increasingly used in automobiles. Once the temperature of gas in a cylinder of the methanol engine is lower than 15 ℃, the methanol is difficult to burn normally, the good starting performance of the methanol engine at low temperature is influenced, and the use condition of the methanol fuel engine is seriously influenced. Therefore, the engine is difficult to start under the low-temperature environment, and the use condition of the methanol fuel engine is seriously influenced.
How to solve the problem that the methanol fuel engine is difficult to start at low temperature is a technical problem which is urgently needed to be solved by the technical personnel in the field.
Disclosure of Invention
In order to solve the above technical problems, the present invention provides a methanol fuel engine, which can be normally started not only in normal temperature but also at low temperature; the invention also provides a starting control method of the methanol fuel engine.
In order to achieve the above object, the present invention adopts the following technical solutions.
The methanol fuel engine comprises an air inlet main pipe, an exhaust main pipe and a plurality of cylinders; one side of each cylinder is communicated with the intake manifold through an intake manifold, and the other side of each cylinder is communicated with the exhaust manifold through an exhaust manifold; the air inlet main pipe is provided with a first electric control three-way switching valve, the first electric control three-way switching valve comprises an inlet A, an outlet B and an outlet C, and the inlet A and the outlet B are connected in series with the air inlet main pipe; the exhaust main pipe is provided with a second electric control three-way switching valve, the second electric control three-way switching valve comprises an inlet D, an outlet E and an outlet F, and the inlet D and the outlet E are connected in series with the exhaust main pipe; a lapping pipe is connected between the outlet C and the outlet F.
The air inlet temperature sensor and the water temperature sensor in the cylinder wall cooling water jacket are respectively connected with a signal input end of the ECU, and a signal output end of the ECU is respectively connected with control ends of the first electric control three-way switching valve and the second electric control three-way switching valve.
Furthermore, the device also comprises an electric control oil injector and an oil injection simulator, wherein an oil injector coil is arranged in the electric control oil injector, and a simulator coil is arranged in the oil injection simulator; the circuit also comprises a single-pole double-throw switch; the single-pole double-throw switch comprises a common end H, a normally closed end I and a normally opened end J, wherein the common end H is connected with the ECU, the normally closed end I is connected with the oil injector coil, and the normally opened end J is connected with the simulator coil; still including setting up the gas temperature sensor in the overlap joint pipe, gas temperature sensor is connected with ECU.
Based on the methanol fuel engine, the start control method comprises the following steps:
firstly, acquiring water temperature T1 in a cylinder wall cooling water jacket from a water temperature sensor in the cylinder wall cooling water jacket by an ECU;
the method comprises the following steps that an ECU judges whether a methanol fuel engine adopts a cold start mode or a normal start mode according to the water temperature T1 in a cylinder wall cooling water jacket:
when T1 is less than 15 ℃, the ECU controls the methanol fuel engine to adopt a cold start mode, and step three is executed, otherwise, the ECU controls the methanol fuel engine to adopt a normal start mode;
and step three, when the methanol fuel engine is in a cold start mode, the electric motor drives the flywheel to rotate, the flywheel drives the crankshaft to rotate, the pistons in the cylinders move up and down to do work on the gas in the cylinders, the temperature of the gas in the cylinders rises, the spark plugs fire normally, the ECU sends signals to the oil injection simulator, the oil injection simulator does not initiate oil injection actions after receiving the signals, then the oil injection simulator feeds the signals back to the ECU, and the ECU receives the signals and defaults that the oil injection process is completed. Further, the ECU acquires the lap pipe temperature T2 from the gas temperature sensor, and determines again that the methanol fuel engine assumes the cold start mode or the normal start mode:
when T2 is more than or equal to 15 ℃, the ECU controls the methanol fuel engine to adopt a normal starting mode;
when T2 is less than 15 ℃, the ECU controls the methanol fuel engine to adopt a cold start mode, and the third step is repeatedly executed until the engine adopts a normal start mode.
Further, in the second step, the normal start mode is: the ECU controls an inlet A and an outlet B of the first electric control three-way switching valve to be communicated, an outlet C of the first electric control three-way switching valve is closed, the ECU controls an inlet D and an outlet E of the second electric control three-way switching valve to be communicated, and an outlet F of the second electric control three-way switching valve is closed; the ECU controls the public end H of the single-pole double-throw switch to be communicated with the normally closed end I; the cold start mode is as follows: the ECU controls an outlet B of the first electric control three-way switching valve to be communicated with an outlet C, an inlet A is closed, the ECU controls an inlet D of the second electric control three-way switching valve to be communicated with an outlet F, and an outlet E is closed; and the ECU controls the common end H of the single-pole double-throw switch to be communicated with the normally open end J.
Compared with the prior art, the methanol fuel engine and the starting control method thereof have the following characteristics: 1. the good low-temperature cold start effect of the methanol fuel engine is realized without using additional equipment; 2. automatically judging and starting a cold start mode of the totally-enclosed cycle; 3. and a gas mode in a circularly preheated fully-closed space is adopted to ensure the good cold start function of the methanol fuel engine in a low-temperature environment.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the structures shown in the drawings without creative efforts.
FIG. 1 is a schematic diagram of the connection of an inlet A and an outlet B of a first electric control three-way switching valve and the connection of an inlet D and an outlet E of a second electric control three-way switching valve in a methanol fuel engine according to the invention;
FIG. 2 is a schematic diagram of the connection between the outlet B and the outlet C of the first electrically controlled three-way switching valve and the connection between the inlet D and the outlet F of the second electrically controlled three-way switching valve in the methanol fuel engine according to the present invention;
FIG. 3 is a schematic diagram of a methanol fueled engine start control process;
FIG. 4 is a schematic diagram of a single-pole double-throw switch with the common terminal H connected to the normally closed terminal I;
FIG. 5 is a schematic diagram of a single-pole double-throw switch with a common terminal H connected to a normally open terminal J;
in the above figures:
1 an air inlet main pipe; 2 an exhaust manifold; 3, a cylinder; 4 an intake manifold; 5 an exhaust manifold; 6 a first electric control three-way switching valve; 7 a second electric control three-way switching valve; 8, connecting pipes; 9 a gas temperature sensor; 10 water temperature sensor in the cooling water jacket of the cylinder wall; 11 single pole double throw switch;
t1, cooling the water temperature in the water jacket on the cylinder wall; t2 lap tube temperature.
Detailed Description
In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in detail below.
In the following description, specific details are set forth in order to provide a thorough understanding of the present invention. The invention can be embodied in many different forms than those described herein and those skilled in the art will appreciate that the invention is susceptible to similar forms of embodiment without departing from the spirit and scope of the invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.
A methanol fuel engine comprises an air inlet manifold 1, an air outlet manifold 2 and a plurality of cylinders 3; one side of each cylinder 3 is communicated with the intake manifold 1 through an intake manifold 4, and the other side of each cylinder 3 is communicated with the exhaust manifold 2 through an exhaust manifold 5; the air inlet main pipe 1 is provided with a first electric control three-way switching valve 6, the first electric control three-way switching valve 6 comprises an inlet A, an outlet B and an outlet C, and the inlet A and the outlet B are connected to the air inlet main pipe 1 in series; the exhaust main pipe 2 is provided with a second electric control three-way switching valve 7, the second electric control three-way switching valve 7 comprises an inlet D, an outlet E and an outlet F, and the inlet D and the outlet E are connected in series with the exhaust main pipe 2; a lapping pipe 8 is connected between the outlet C and the outlet F. The water-cooling water jacket further comprises an ECU and a water temperature sensor 10 in the water jacket, wherein the signal output end of the water temperature sensor 10 in the water jacket is connected with the signal input end of the ECU, and the signal output end of the ECU is respectively connected with the control ends of the first electric-control three-way switching valve 6 and the second electric-control three-way switching valve 7. An Electronic Control Unit (ECU) is also called a "traveling computer" or a "vehicle-mounted computer". The controller is a microcomputer controller special for the automobile in terms of application and is also called a singlechip special for the automobile. It is the same as common single-chip microcomputer, and is composed of microprocessor (CPU), memory (ROM, RAM), input/output interface (I/O), A/D converter and large scale integrated circuit for shaping and driving.
In the above embodiment, the first electrically controlled three-way switching valve 6 is disposed on the intake manifold 1 of the methanol fuel engine, the inlet a and the outlet B are connected in series to the intake manifold 1, the second electrically controlled three-way switching valve 7 is disposed on the exhaust manifold 2, the inlet D and the outlet E are connected in series to the exhaust manifold 2, and the overlap pipe 8 is connected between the outlet C and the outlet F. Under a normal state, an inlet A and an outlet B of the first electric control three-way switching valve 6 are communicated, an outlet C of the first electric control three-way switching valve is closed, an inlet D and an outlet E of the second electric control three-way switching valve 7 are communicated, an outlet F of the second electric control three-way switching valve is closed, and the methanol fuel engine realizes external circulation.
When the inlet A of the first electric control three-way switching valve 6 is closed, the outlet B is communicated with the outlet C, the outlet E of the second electric control three-way switching valve 7 is closed, the inlet D is communicated with the outlet F, and the methanol fuel engine realizes internal circulation.
Further, referring to fig. 4 and 5, the fuel injection system further comprises an electric control fuel injector and a fuel injection simulator, wherein a fuel injector coil is arranged in the electric control fuel injector, and a simulator coil is arranged in the fuel injection simulator; the electronic control oil injector receives the signal from the ECU, controls the oil injector to inject oil and sends a signal to the ECU to indicate that the oil injection is finished; the oil injection simulator receives the signal from the ECU, does not control the oil injection of the oil injector, but still needs to send the signal to the ECU, so that the ECU does not report faults. Referring to fig. 4 and 5, a single pole double throw switch 11 is further included; the single-pole double-throw switch 11 comprises a common end H, a normally closed end I and a normally opened end J, wherein the common end H is connected with the ECU, the normally closed end I is connected with an oil injector coil, and the normally opened end J is connected with an emulator coil; the device also comprises a gas temperature sensor 9 arranged in the lap joint pipe, and the gas temperature sensor 9 is connected with the ECU. When the common end H is communicated with the normally closed end I, the ECU controls the oil injector to inject oil and sends a signal to the ECU to indicate that the oil injection is finished. When the public end H is switched to be communicated with the normally open end J, the oil injection simulator only sends a signal to the ECU, and the ECU is ensured not to report faults.
A start-up control method of a methanol fuel engine, based on the above methanol fuel engine, comprising the steps of:
firstly, acquiring water temperature T1 in a cylinder wall cooling water jacket from a water temperature sensor 10 in the cylinder wall cooling water jacket by an ECU;
step two, the ECU judges whether the methanol fuel engine adopts a cold start mode or a normal start mode according to the water temperature T1 in the cylinder wall cooling water jacket:
when T1 is less than 15 ℃, the ECU controls the methanol fuel engine to adopt a cold start mode, and step three is executed, otherwise, the ECU controls the methanol fuel engine to adopt a normal start mode;
step three, the methanol fuel engine is in a cold start mode, the air inlet channel and the exhaust channel are closed, the air cylinder 3 and the lap joint pipe 8 form a closed environment, the electric motor drives the flywheel to rotate, the flywheel drives the crankshaft to rotate, the pistons in the air cylinders move up and down to do work on the air in the air cylinders, the air temperature in the air cylinders rises, the spark plugs fire normally, meanwhile, the ECU obtains the temperature T2 of the lap joint pipe from the air temperature sensor 9, and the methanol fuel engine is judged to adopt the cold start mode or the normal start mode again:
when T2 is more than or equal to 15 ℃, the ECU controls the methanol fuel engine to adopt a normal starting mode;
and when the T2 is less than 15 ℃, the ECU controls the methanol fuel engine to adopt a cold start mode, and repeatedly executes the step three until the engine adopts a normal start mode.
Specifically, in step two, the normal start mode is: the ECU controls the inlet A and the outlet B of the first electric control three-way switching valve 6 to be communicated, the outlet C is closed, the ECU controls the inlet D and the outlet E of the second electric control three-way switching valve 7 to be communicated, and the outlet F is closed; and the ECU controls the common end H of the single-pole double-throw switch 11 to be communicated with the normally closed end I, controls the oil sprayer to spray oil and sends a signal to the ECU to indicate that the oil spraying is finished. The cold start mode is as follows: the ECU controls an outlet B of the first electric control three-way switching valve 6 to be communicated with an outlet C, an inlet A is closed, the ECU controls an inlet D of the second electric control three-way switching valve 7 to be communicated with an outlet F, and an outlet E is closed; the ECU controls the public end H of the single-pole double-throw switch 11 to be communicated with the normally open end J, and the oil injection simulator only sends signals to the ECU to ensure that the ECU does not report faults.
Although the invention has been described in detail in this specification with reference to specific embodiments and examples, it will be apparent to those skilled in the art that certain changes and modifications can be made thereto without departing from the scope of the invention. Accordingly, such modifications and improvements are intended to be within the scope of this invention as claimed.
Claims (3)
1. A methanol fuel engine is characterized by comprising an air inlet main pipe (1), an air outlet main pipe (2) and a plurality of cylinders (3); one side of each cylinder (3) is communicated with the intake manifold (1) through an intake manifold (4), and the other side of each cylinder (3) is communicated with the exhaust manifold (2) through an exhaust manifold (5);
the air inlet main pipe (1) is provided with a first electric control three-way switching valve (6), the first electric control three-way switching valve (6) comprises an inlet A, an outlet B and an outlet C, and the inlet A and the outlet B are connected to the air inlet main pipe (1) in series;
a second electric control three-way switching valve (7) is arranged on the exhaust main pipe (2), the second electric control three-way switching valve (7) comprises an inlet D, an outlet E and an outlet F, and the inlet D and the outlet E are connected to the exhaust main pipe (2) in series;
a lapping pipe (8) is connected between the outlet C and the outlet F;
the water-cooling water jacket further comprises an ECU and a water temperature sensor (10) in the water jacket, wherein the signal output end of the water temperature sensor (10) in the water jacket is connected with the signal input end of the ECU, and the signal output end of the ECU is respectively connected with the control ends of the first electric-control three-way switching valve (6) and the second electric-control three-way switching valve (7);
the oil injection simulator comprises an oil injection device, an oil injection coil and an oil injection simulator, wherein the oil injection device is internally provided with the oil injection coil;
the circuit also comprises a single-pole double-throw switch (11);
the single-pole double-throw switch (11) comprises a common end H, a normally closed end I and a normally opened end J, wherein the common end H is connected with the ECU, the normally closed end I is connected with an oil injector coil, and the normally opened end J is connected with an emulator coil; the device also comprises a gas temperature sensor (9) arranged in the lap joint pipe, wherein the gas temperature sensor (9) is connected with the ECU.
2. A start control method of a methanol fuel engine based on claim 1, characterized by comprising the steps of:
step one, an ECU acquires water temperature T1 in a cylinder wall cooling water jacket from a water temperature sensor (10) in the cylinder wall cooling water jacket;
step two, the ECU judges whether the methanol fuel engine adopts a cold start mode or a normal start mode according to the water temperature T1 in the cylinder wall cooling water jacket:
when T1 is less than 15 ℃, the ECU controls the methanol fuel engine to adopt a cold start mode, and step three is executed, otherwise, the ECU controls the methanol fuel engine to adopt a normal start mode;
step three, when the methanol fuel engine is in a cold start mode, the electric motor drives the flywheel to rotate, the flywheel drives the crankshaft to rotate, the piston in each cylinder moves up and down, the gas in the cylinder is acted, the temperature of the gas in the cylinder rises, the spark plug normally fires, the ECU acquires the temperature T2 of the lap joint pipe from the gas temperature sensor (9), and the methanol fuel engine is judged to adopt the cold start mode or the normal start mode again:
when T2 is more than or equal to 15 ℃, the ECU controls the methanol fuel engine to adopt a normal starting mode;
and when the T2 is less than 15 ℃, the ECU controls the methanol fuel engine to continue to keep the cold starting mode, and repeatedly executes the step three until the engine adopts the normal starting mode.
3. The start control method of a methanol fuel engine as set forth in claim 2, characterized in that in step two, the normal start mode is: the ECU controls an inlet A and an outlet B of the first electric control three-way switching valve (6) to be communicated, an outlet C of the first electric control three-way switching valve is closed, the ECU controls an inlet D and an outlet E of the second electric control three-way switching valve (7) to be communicated, and an outlet F of the second electric control three-way switching valve is closed; the ECU controls the common end H of the single-pole double-throw switch (11) to be communicated with the normally closed end I;
the cold start mode is as follows: the ECU controls an outlet B of the first electric control three-way switching valve (6) to be communicated with an outlet C, an inlet A is closed, the ECU controls an inlet D of the second electric control three-way switching valve (7) to be communicated with an outlet F, and an outlet E is closed; the ECU controls the common end H of the single-pole double-throw switch (11) to be connected with the normally open end J.
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| CN202011399144.0A CN112555079B (en) | 2020-12-02 | 2020-12-02 | Methanol fuel engine and starting control method thereof |
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| CN202011399144.0A CN112555079B (en) | 2020-12-02 | 2020-12-02 | Methanol fuel engine and starting control method thereof |
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| CN112555079A (en) | 2021-03-26 |
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