Diesel oil-methanol dual-fuel injection system based on air assistance
By combining air-assisted injection technology and exhaust gas recirculation device, the problem of poor methanol fuel atomization was solved, and efficient combustion of diesel-methanol dual-fuel engine was achieved.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-03-14
- Publication Date
- 2026-03-27
AI Technical Summary
In existing diesel-methanol dual-fuel engines, methanol fuel absorbs heat during evaporation in the intake manifold, resulting in poor atomization, which prevents the rapid formation of a combustible mixture and makes it impossible to provide a stable gas supply through the gas cylinder, thus affecting combustion efficiency.
The system employs air-assisted injection technology combined with an exhaust gas recirculation device. By mixing exhaust gas with fresh air, the system provides a gas supply that enables methanol to be atomized twice. The injection system is controlled by an ECU.
It improves the atomization of methanol, ensuring complete vaporization of fuel in the intake manifold, and enhances combustion efficiency and the stability of the fuel injection system.
Smart Images
Figure CN224049316U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to a methanol injection system for a diesel-methanol dual-fuel engine based on air-assisted technology, specifically to a methanol injection system that uses air-assisted technology to inject methanol into the intake manifold. Technical Background
[0002] Methanol, as a clean fuel, is a crucial alternative fuel for achieving clean combustion in engines due to its high oxygen content and low emissions. Furthermore, its diverse production methods and wide availability give it a cost advantage. However, because methanol's latent heat of vaporization is 3-4 times that of gasoline and diesel, this high heat causes it to absorb more heat during evaporation in the intake manifold. This further lowers the average temperature of the intake manifold and cylinder, and the resulting cooling effect hinders complete vaporization, leading to poor atomization of the methanol fuel injected into the intake manifold and preventing the rapid formation of a combustible mixture.
[0003] Air-assisted injection technology is an injection technology that can improve fuel atomization characteristics at lower injection pressures.
[0004] This technology involves first injecting fuel through an upper nozzle into a premixing chamber filled with pressurized gas to achieve initial fuel atomization; then, the mixture is ejected through a lower nozzle, where the high-pressure airflow at the nozzle breaks down the surface tension of the droplets, causing secondary atomization. However, in practical applications, due to vehicle limitations, a stable gas supply cannot be provided for this technology via gas cylinders or similar equipment. Utility Model Content
[0005] The purpose of this invention is to overcome the shortcomings of the above-mentioned technologies at the present stage, so that methanol can be injected through air-assisted injection technology, and gas supply and methanol injection through the exhaust gas recirculation device can be realized.
[0006] To achieve the purpose of this utility model, the technical solution adopted by this utility model is as follows:
[0007] A diesel-methanol dual-fuel injection system based on air-assisted injection technology includes a methanol injection system, a diesel injection system, and a gas supply system.
[0008] The methanol injection system described above injects methanol into the intake manifold via an air-assisted injection system, and includes a methanol tank, an air-assisted injection device, an ECU, a methanol pump, a methanol filter, and a pressure relief valve.
[0009] The aforementioned diesel injection system injects diesel fuel into the cylinder via injectors and includes a diesel tank, a fuel-water separator, a high-pressure fuel pump, a fuel rail, injectors, and an ECU.
[0010] The methanol injection system and the diesel injection system are controlled by the ECU.
[0011] The air-assisted injection system realizes twice atomization of the methanol, and the upper and lower injectors of the air-assisted injector are opened by the ECU.
[0012] The gas supply device supplies air into the air-assisted injection device by mixing the exhaust gas with fresh air through the exhaust gas recirculation device, and comprises the exhaust gas recirculation device, the filter, the pressure stabilizing chamber and the temperature sensor.
[0013] The temperature sensor of the air supply system is connected with the ECU to control the supply amount of the fresh air.
[0014] Compared with the existing diesel-methanol dual fuel engine injection system, the methanol injection system has the advantages that:
[0015] 1. The methanol is injected by the air-assisted injection device to improve the atomization effect of the methanol.
[0016] 2. The exhaust gas recirculation device is used to provide gas for the air-assisted injector to make the air-assisted injection device work normally.
[0017] 3. The air-assisted injection is realized by using the exhaust gas recirculation device of the engine itself, and the system arrangement is simplified. BRIEF DESCRIPTION OF DRAWINGS
[0018] Figure 1 The figure is a structural schematic view of the methanol injection system
[0019] Wherein, 1, the methanol tank, 2, the methanol filter, 3, the methanol pump, 4, the pressure relief valve, 5, the ECU, 6, the air-assisted injector, 7, the oil tank, 8, the diesel filter, 9, the diesel pump, 10, the oil rail, 11, the injector, 12, the exhaust gas recirculation device, 13, the filter, 14, the pressure stabilizing chamber, 15, the temperature sensor, 16, the air inlet, 17, the cylinder, 18, the self-suction device. DETAILED DESCRIPTION
[0020] The methanol injection system will be further described below in combination with the drawings and examples.
[0021] As Figure 1As shown, an air-assisted diesel-methanol dual fuel injection system includes 1, a methanol tank, 2, a methanol filter, 3, a methanol pump, 4, a pressure relief valve, 5, an ECU, 6, an air-assisted injector, 7, an oil tank, 8, a diesel filter, 9, a high-pressure diesel pump, 10, an oil rail, 11, an injector, 12, an exhaust gas recirculation device, 13, a filter, 14, a pressure stabilizing chamber, 15, a temperature sensor, 16, an intake port, 17, a cylinder, 18, a self-suction device; the methanol tank 1 is connected to the methanol filter 2 through the methanol pipe; the methanol filter 2 is connected to the methanol pump 3 through the methanol pipe; the methanol pump 3 is connected to the pressure relief valve 4 through the methanol pipe; the pressure relief valve 4 is connected to the ECU 5 through the line on one side, and connected to the air-assisted injector 6 through the methanol pipe on the other side; the air-assisted injector 6 is installed on the intake port 16; the exhaust gas recirculation device 12 is connected to the filter 13 through the gas path; the pressure stabilizing chamber 14 is installed between the filter 13 and the air-assisted injector 6 through the gas path; the self-suction device 18 is installed between the pressure stabilizing chamber 14 and the intake port 16 through the gas path; the temperature sensor 15 is installed in the pressure stabilizing chamber 14 and connected to the ECU 5 through the line; the oil tank 7 is connected to the diesel filter 8 through the oil pipe; the diesel filter 8 is connected to the high-pressure diesel pump 9 through the oil pipe; the high-pressure diesel pump 9 is connected to the oil rail 10 through the oil pipe; the oil rail 10 is connected to the injector 11; the injector 11 is installed on the cylinder 17.
[0022] The working principle of the methanol injection system is as follows: the methanol pump 3 sucks the methanol in the methanol tank 1, filters it through the methanol filter 2, and then enters the pressure relief valve 4 through the methanol pump 3. The pressure relief valve 4 is adjusted according to the control of the ECU 5, and then enters the air-assisted injector 6 through the methanol inlet. The methanol is injected into the intake port through air-assisted injection.
[0023] The working principle of the gas supply device is as follows: the exhaust gas enters the pressure stabilizing chamber 14 through the filter 13 after passing through the exhaust gas recirculation device 12, mixes with the fresh air introduced from the intake port 16 by the self-suction device 18, cools the exhaust gas, forms a mixed gas, and then enters the air inlet of the air-assisted injector 6 to complete the air-assisted injection.
[0024] When the air-assisted injector 6 is working, the methanol enters the air-assisted injector 6 through the methanol inlet, and the gas mixed and cooled by the exhaust gas recirculation device 12 and the intake port 16 enters through the air inlet of the air-assisted injector 6.
Claims
1. An air-assisted diesel-methanol dual fuel injection system based on air assistance, comprising a methanol tank (1), a methanol filter (2), a methanol pump (3), a pressure relief valve (4), an ECU (5), an air-assisted injector (6), an oil tank (7), a diesel filter (8), a diesel pump (9), an oil rail (10), an oil injector (11), an exhaust gas recirculation device (12), a filter (13), a pressure stabilizing chamber (14), a temperature sensor (15), an air intake passage (16), a cylinder (17), a self-suction device (18), characterized in that: Methanol tank (1) and methanol filter (2) through alcohol pipe connected; methanol filter (2) and methanol pump (3) through alcohol pipe connected; methanol pump (3) and pressure relief valve (4) through alcohol pipe connected; pressure relief valve (4) through line connection to ECU (5) on one side, on one side through alcohol pipe and air-assisted injector (6) alcohol inlet connected; air-assisted injector (6) is installed on the intake port (16); exhaust gas recirculation device (12) through air path and filter (13) connected; pressure stabilization chamber (14) through air path is installed between filter (13) and air-assisted injector (6); self-suction device (18) through air path is installed between pressure stabilization chamber (14) and intake port (16); temperature sensor (15) is installed in pressure stabilization chamber (14), and is connected to ECU (5) through line; oil tank (7) and diesel filter (8) through oil pipe connected; diesel filter (8) and high-pressure diesel pump (9) through oil pipe connected; high-pressure diesel pump (9) and oil rail (10) through oil pipe connected; oil rail (10) and oil injector (11) connected; oil injector (11) is installed on the cylinder (17).
2. An air-assisted diesel-methanol dual fuel injection system according to claim 1, wherein: Air-assisted injector (6) is used to inject methanol into the intake port (16), realizing air-assisted injection of methanol.
3. An air-assisted diesel-methanol dual fuel injection system according to claim 1, wherein: The gas source of air-assisted injector (6) is the mixed gas after the exhaust gas of engine and fresh air at intake port (16) are mixed and cooled.
4. An air-assisted diesel-methanol dual fuel injection system according to claim 1, wherein: Diesel injection system adopts in-cylinder direct injection, which is used for igniting the injected methanol mixture.