Dual-rail single-nozzle methanol-diesel dual-fuel injection system and control method

Abstract

The present invention discloses a dual-rail, single-nozzle methanol-diesel dual-fuel injection system and control method, comprising an electronic control unit, a two-in-one nozzle, a methanol rail, and a diesel rail. The two-in-one nozzle is disposed in the combustion chamber of an engine. The methanol rail is connected to the two-in-one nozzle via a pipeline and supplies methanol fuel to the two-in-one nozzle. The diesel rail is connected to the two-in-one nozzle via a pipeline and supplies diesel fuel to the two-in-one nozzle. The two-in-one nozzle, the methanol rail, and the diesel rail are all electrically connected to the electronic control unit and are controlled by the electronic control unit. The methanol-diesel dual-fuel injection system of the present invention can improve the fuel economy and emission performance of a diesel engine. The system simultaneously injects methanol and diesel fuel through a single nozzle, achieving an optimal mixture of the two fuels. The high octane value of methanol is utilized to improve combustion efficiency and reduce emissions.

Description

Technical Field

[0001] The present invention relates to the field of engine design and manufacturing, and in particular to a dual-rail single-nozzle methanol-diesel dual-fuel injection system and a control method thereof. Background Art

[0002] With the intensifying global energy crisis and increasingly stringent emissions regulations, methanol-diesel dual-fuel engines have recently seen widespread use in marine propulsion, generator sets, and other power systems. Currently, methanol-diesel dual-fuel engines are typically modified from existing diesel engines. Fuel injection methods primarily include: 1. Direct methanol-diesel injection into the cylinders; 2. Methanol injection into the intake manifold and diesel injection into the cylinders. Both fuel injection methods require two independent fuel injection systems and controllers, namely, a methanol pump, a methanol rail, a diesel pump, a diesel rail, a methanol nozzle, a diesel nozzle, and an injection controller.

[0003] Existing fuel injection methods require two fuel nozzles and two injection controllers, increasing overall engine cost. Dual direct injection systems require two nozzles, making their placement on the cylinder head difficult, increasing engine development costs. Installing the nozzles in the intake duct interferes with other components. This can also lead to uneven fuel distribution, causing unstable cylinder operation and making it difficult to precisely control the load requirements of each cylinder. This reduces engine efficiency and makes it difficult to achieve a balance between high performance and low emissions.

[0004] The invention relates to a dual-rail single-nozzle methanol-diesel dual-fuel injection system, aiming to improve the fuel economy and emission performance of a diesel engine.

[0005] The information disclosed in this background technology section is only intended to enhance understanding of the overall background of the invention and should not be regarded as an admission or any form of suggestion that the information constitutes the prior art already known to a person skilled in the art. Summary of the Invention

[0006] The purpose of the present invention is to provide a dual-rail, single-nozzle methanol-diesel dual-fuel injection system that can improve the fuel economy and emission performance of diesel engines. The system simultaneously injects methanol and diesel fuel through a single nozzle to achieve an optimal mixture of the two fuels, and utilizes the high octane value of methanol to improve combustion efficiency and reduce emissions.

[0007] Another object of the present invention is to provide a control method for a dual-rail single-nozzle methanol-diesel dual fuel injection system.

[0008] To achieve the above objectives, the present invention provides a dual-rail single-nozzle methanol-diesel dual-fuel injection system, comprising an electronic control unit, a two-in-one nozzle, a methanol rail, and a diesel rail; the two-in-one nozzle is arranged in the combustion chamber of the engine; the methanol rail is connected to the two-in-one nozzle via a pipeline and supplies methanol fuel to the two-in-one nozzle; the diesel rail is connected to the two-in-one nozzle via a pipeline and supplies diesel fuel to the two-in-one nozzle; wherein the two-in-one nozzle, the methanol rail, and the diesel rail are all electrically connected to the electronic control unit and are all controlled by the electronic control unit.

[0009] In a preferred embodiment, the two-in-one nozzle is provided with independent methanol channels and diesel channels, and the electronic control unit controls the pressures in the methanol rail and the diesel rail to achieve synchronous injection of the two fuels.

[0010] In a preferred embodiment, the dual-rail single-nozzle methanol-diesel dual-fuel injection system further includes a methanol pressure regulator, which is connected to the methanol rail via a pipeline. The electronic control unit controls the pressure of methanol entering the methanol rail via the methanol pressure regulator to achieve precise control of the methanol injection pressure.

[0011] In a preferred embodiment, the dual-rail single-nozzle methanol-diesel dual fuel injection system further includes a methanol pump, the oil outlet of the methanol pump is connected to the methanol pressure regulator through a pipeline, and the electronic control unit controls the methanol pump to deliver methanol fuel to the methanol rail through the methanol pressure regulator.

[0012] In a preferred embodiment, the dual-rail single-nozzle methanol-diesel dual-fuel injection system further includes a methanol filter and a methanol fuel tank; the oil outlet of the methanol filter is connected to the methanol pump via a pipeline; the methanol fuel tank is used to store methanol fuel; wherein the methanol fuel stored in the methanol fuel tank is filtered by the methanol filter and then transported to the methanol pressure regulator and the methanol rail by the methanol pump.

[0013] In a preferred embodiment, the dual-rail single-nozzle methanol-diesel dual-fuel injection system further includes a diesel pump, which is connected to the diesel rail via a pipeline. The electronic control unit generates high-pressure diesel through the diesel pump and then sends it to the diesel rail to achieve precise control of the methanol injection pressure.

[0014] In a preferred embodiment, the dual-rail single-nozzle methanol-diesel dual-fuel injection system further includes a diesel filter and a diesel fuel tank; the oil outlet of the diesel filter is connected to the oil inlet of the diesel pump via a pipeline; the oil outlet of the diesel fuel tank is connected to the oil inlet of the diesel filter via a pipeline; wherein the diesel fuel stored in the diesel fuel tank is filtered by the diesel filter and then delivered to the diesel rail by the diesel pump.

[0015] In a preferred embodiment, the dual-rail single-nozzle methanol-diesel dual-fuel injection system further includes a pressure sensor, which is disposed on the methanol rail and the diesel rail. The electronic control unit precisely controls the pressure in the methanol rail and the diesel rail by monitoring the data of the pressure sensor in real time.

[0016] To achieve the above-mentioned another object, the present invention also provides a control method for a dual-rail single-nozzle methanol-diesel dual-fuel injection system. The control method is used for controlling the aforementioned dual-rail single-nozzle methanol-diesel dual-fuel injection system, and the control method includes: a methanol pump draws methanol fuel from a methanol fuel tank, and after filtering impurities in the methanol fuel through a methanol filter, an electronic control unit controls the pressure of the methanol fuel entering the methanol rail through a methanol pressure regulator, thereby achieving precise control of the methanol injection pressure; a diesel pump draws diesel fuel that has passed through the diesel filter from the diesel fuel tank, establishes high-pressure diesel, and then sends it to the diesel rail, and the electronic control unit controls the diesel pump to achieve precise control of the diesel injection pressure; the electronic control unit precisely controls the pressures in the methanol rail and the diesel rail by real-time monitoring of data from the pressure sensor; and the two-in-one nozzle is controlled by the electronic control unit for injection, and the electronic control unit controls the two-in-one nozzle to spray an optimal ratio of methanol fuel and diesel fuel mixture into the combustion chamber based on calibration data.

[0017] In a preferred embodiment, independent methanol channels and diesel channels are provided inside the two-in-one nozzle, and the electronic control unit controls the methanol rail and the diesel rail to achieve synchronous injection of methanol fuel and diesel fuel through the methanol channel and the diesel channel.

[0018] Compared with the existing technology, the dual-track single-nozzle methanol-diesel dual-fuel injection system and control method of the present invention have the following beneficial effects: the proposal simultaneously injects methanol and diesel fuels through a single nozzle, and the engine cylinder head does not need to process an additional nozzle mounting hole or add an additional nozzle component, thereby effectively reducing the production cost of the engine; and the proposal uses a specially designed single nozzle structure with separate methanol and diesel channels, which can simultaneously inject methanol and diesel fuels, making the fuel mixing more complete and the landing point more precise, effectively suppressing the occurrence of detonation, and improving the thermal efficiency of combustion. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 2. It is a schematic diagram of the structural arrangement of a methanol-diesel dual-fuel injection system according to one embodiment of the present invention;

[0020] Figure 2 is a schematic diagram illustrating components of a methanol-diesel dual-fuel injection system according to one embodiment of the present invention;

[0021] Figure 3Schematic diagram of the principle structure of a methanol-diesel dual-fuel injection system according to one embodiment of the present invention.

[0022] Description of main reference numerals:

[0023] 1- Electronic Control Unit (ECU), 2- Two-in-one Injector, 3- Methanol Rail, 4- Methanol Pressure Regulator, 5- Methanol Filter, 6- Methanol Fuel Tank, 7- Methanol Pump, 8- Diesel Rail, 9- Diesel Pump, 10- Diesel Fuel Tank, 11- Diesel Filter. DETAILED DESCRIPTION

[0024] The specific embodiments of the present invention are described in detail below with reference to the accompanying drawings, but it should be understood that the protection scope of the present invention is not limited by the specific embodiments.

[0025] Unless expressly stated otherwise, throughout the specification and claims, the term "comprise" or variations such as "include" or "comprising", etc., will be understood to include the stated elements or components but not to exclude other elements or other components.

[0026] like Figures 1 to 3 As shown, a dual-rail single-nozzle methanol-diesel dual-fuel injection system according to a preferred embodiment of the present invention mainly includes an electronic control unit 1 (ECU), a two-in-one nozzle 2, a methanol rail and a diesel rail; the two-in-one nozzle 2 is arranged at the combustion chamber of the engine; the methanol rail 3 is connected to the two-in-one nozzle 2 through a pipeline and provides methanol fuel to the two-in-one nozzle 2; the diesel rail 8 is connected to the two-in-one nozzle 2 through a pipeline and provides diesel fuel to the two-in-one nozzle 2; wherein the two-in-one nozzle 2, the methanol rail 3 and the diesel rail 8 are all electrically connected to the electronic control unit 1 and are all controlled by the electronic control unit 1.

[0027] See also Figure 3 In some embodiments, a special design structure is adopted inside the two-in-one nozzle 2, which is provided with an independent methanol channel (not shown) and a diesel channel (not shown). The electronic control unit 1 controls the pressure in the methanol rail 3 and the diesel rail 8 to achieve synchronous injection of the two fuels.

[0028] In some embodiments, the dual-rail single-nozzle methanol-diesel dual-fuel injection system further includes a methanol pressure regulator 4 , which is connected to the methanol rail 3 through a pipeline. The electronic control unit 1 controls the pressure of methanol entering the methanol rail 3 through the methanol pressure regulator 4 , thereby achieving precise control of the methanol injection pressure.

[0029] In some embodiments, the dual-rail single-nozzle methanol-diesel dual fuel injection system further includes a methanol pump 7 , the oil outlet of the methanol pump 7 is connected to the methanol pressure regulator 4 through a pipeline, and the electronic control unit 1 controls the methanol pump 7 to deliver methanol fuel to the methanol rail 3 through the methanol pressure regulator 4 .

[0030] In some embodiments, the dual-rail single-nozzle methanol-diesel dual-fuel injection system further includes a methanol filter 5 and a methanol fuel tank 6; the oil outlet of the methanol filter 5 is connected to the methanol pump 7 through a pipeline; the methanol fuel tank 6 is used to store methanol fuel; wherein the methanol fuel stored in the methanol fuel tank 6 is filtered by the methanol filter 5 and then transported to the methanol pressure regulator 4 and the methanol rail 3 by the methanol pump 7.

[0031] In some embodiments, the dual-rail single-nozzle methanol-diesel dual fuel injection system further includes a diesel pump 9 , which is connected to the diesel rail 8 via a pipeline. The electronic control unit 1 creates high-pressure diesel through the diesel pump 9 and then sends it to the diesel rail 8 to achieve precise control of the methanol injection pressure.

[0032] In some embodiments, the dual-rail single-nozzle methanol-diesel dual-fuel injection system further includes a diesel filter 11 and a diesel fuel tank 10; the oil outlet of the diesel filter 11 is connected to the oil inlet of the diesel pump 9 via a pipeline; the oil outlet of the diesel fuel tank 10 is connected to the oil inlet of the diesel filter 11 via a pipeline; wherein the diesel fuel stored in the diesel fuel tank 10 is filtered by the diesel filter 11 and then delivered to the diesel rail 8 by the diesel pump 9.

[0033] See also Figure 2 In some embodiments, the dual-rail single-nozzle methanol-diesel dual-fuel injection system further includes a pressure sensor, which is disposed on the methanol rail 3 and the diesel rail 8 or other components. The electronic control unit 1 precisely controls the pressures in the methanol rail 3 and the diesel rail 8 by monitoring the data from the pressure sensors in real time.

[0034] See also Figure 2In some embodiments, a dual-rail single-nozzle methanol-diesel dual-fuel injection system is provided with an injection control box and a monitoring and safety box, wherein the injection control box includes a crankshaft speed sensor, a camshaft speed sensor, an oil pressure sensor, an oil temperature sensor, a fresh water inlet pressure sensor, a fresh water outlet pressure sensor, a boost air pressure sensor, a boost air temperature sensor, a gas pressure sensor, and a gas temperature sensor, and many other devices. The electronic control unit 1 can control the injection system through feedback information from the above-mentioned many sensors; the monitoring and safety box further includes an exhaust temperature thermocouple, an axle temperature sensor, a safety speed sensor, an oil pressure sensor, a supercharger speed sensor, a start output, a shutdown output, an emergency shutdown output, a fuel leak input, a knock sensor, a NOx sensor, and a user IO, and many other components. The electronic control unit 1 can monitor the status of the entire machine in real time through feedback information from the above-mentioned many components.

[0035] See also Figure 3 In some embodiments, the diesel fuel of the dual-rail single-nozzle methanol-diesel dual-fuel injection system is generally delivered to the diesel rail 8 at a high pressure of 400 to 1600 bar through the engine-mounted diesel high-pressure pump and the diesel high-pressure pressure-limiting valve on the high-pressure pump. Excess diesel fuel is returned to the diesel fuel tank through an integrated control return line. Methanol fuel is generally delivered to the methanol rail 3 at a pressure of 300 to 600 bar through methanol peripheral pressure-building equipment or the engine-mounted methanol pump 7.

[0036] To achieve another of the aforementioned objectives, the present invention further provides a control method for a dual-rail, single-nozzle methanol-diesel dual-fuel injection system. The control method is used for controlling the aforementioned dual-rail, single-nozzle methanol-diesel dual-fuel injection system, and the control method includes: a methanol pump 7 pumps methanol fuel from a methanol fuel tank 6, and after filtering impurities in the methanol fuel through a methanol filter 5, an electronic control unit 1 controls a methanol pressure regulator 4 to precisely control the pressure of the methanol fuel entering the methanol rail 3, thereby achieving precise control of the methanol injection pressure; a diesel pump 9 pumps diesel fuel from a diesel fuel tank 10 after passing through a diesel filter 11, and after generating high-pressure diesel, delivers it to a diesel rail 8, and the electronic control unit 1 controls the diesel pump 9 to precisely control the diesel injection pressure; the electronic control unit 1 precisely controls the pressures within the methanol rail 3 and the diesel rail 8 by real-time monitoring of data from the pressure sensors; and the electronic control unit 1 controls the two-in-one nozzle 2 for injection, and the electronic control unit 1 controls the two-in-one nozzle 2 to inject an optimal ratio of methanol fuel and diesel fuel mixture into the combustion chamber based on calibration data.

[0037] In some embodiments, the two-in-one nozzle 2 adopts a special design structure, which has independent methanol channels and diesel channels inside. The electronic control unit 1 controls the methanol rail 3 and the diesel rail 8 to achieve synchronous injection of methanol fuel and diesel fuel through the methanol channel and the diesel channel.

[0038] In summary, the dual-track single-nozzle methanol-diesel dual-fuel injection system and control method of the present invention have the following advantages: the proposal simultaneously injects methanol and diesel fuels through a single nozzle, and the engine cylinder head does not need to process an additional nozzle mounting hole or add an additional nozzle component, which effectively reduces the production cost of the engine; and the proposal uses a specially designed single nozzle structure with separate methanol and diesel channels, which can simultaneously inject methanol and diesel fuels, making the fuel mixing more complete and the landing point more precise, effectively suppressing the occurrence of knock, and improving the thermal efficiency of combustion.

[0039] The foregoing descriptions of specific exemplary embodiments of the present invention are for purposes of illustration and description. These descriptions are not intended to limit the invention to the precise forms disclosed, and it is apparent that many variations and modifications are possible in light of the foregoing teachings. The exemplary embodiments have been selected and described for the purpose of explaining the specific principles of the invention and their practical application, thereby enabling those skilled in the art to realize and utilize a variety of exemplary embodiments of the invention and various options and modifications. The scope of the invention is intended to be defined by the claims and their equivalents.

Claims

1. A dual-track single-nozzle methanol-diesel dual fuel injection system, characterized in that: include: Electronic control unit; A two-in-one nozzle, which is arranged at the combustion chamber of the engine; a methanol rail, which is connected to the two-in-one nozzle through a pipeline and provides methanol fuel to the two-in-one nozzle; and a diesel rail, which is connected to the two-in-one nozzle through a pipeline and provides diesel fuel to the two-in-one nozzle; The two-in-one nozzle, the methanol rail, and the diesel rail are all electrically connected to the electronic control unit and are controlled by the electronic control unit; The two-in-one nozzle is provided with independent methanol and diesel channels, and the electronic control unit controls the pressure in the methanol and diesel rails to achieve synchronous injection of the two fuels. The dual-rail single-nozzle methanol-diesel dual-fuel injection system further includes a methanol pressure regulator, which is connected to the methanol rail via a pipeline. The electronic control unit controls the pressure of methanol entering the methanol rail through the methanol pressure regulator to achieve precise control of the methanol injection pressure. The dual-rail single-nozzle methanol-diesel dual-fuel injection system further includes a methanol pump, the oil outlet of which is connected to the methanol pressure regulator via a pipeline, and the electronic control unit controls the methanol pump to deliver methanol fuel to the methanol rail through the methanol pressure regulator; The dual-rail single-nozzle methanol-diesel dual-fuel injection system further includes a diesel pump connected to the diesel rail via a pipeline. The electronic control unit generates high-pressure diesel through the diesel pump and then delivers it to the diesel rail to achieve precise control of the methanol injection pressure. The dual-rail single-nozzle methanol-diesel dual-fuel injection system further includes pressure sensors disposed on the methanol rail and the diesel rail. The electronic control unit precisely controls the pressures within the methanol rail and the diesel rail by monitoring data from the pressure sensors in real time.

2. The dual-rail single-nozzle methanol-diesel dual fuel injection system according to claim 1, characterized in that: Also includes: a methanol filter, the oil outlet of which is connected to the methanol pump through a pipeline; as well as a methanol fuel tank for storing methanol fuel; The methanol fuel stored in the methanol fuel tank is filtered by the methanol filter and then transported to the methanol pressure regulator and the methanol rail by the methanol pump.

3. The dual-rail single-nozzle methanol-diesel dual fuel injection system according to claim 2, characterized in that: Also includes: a diesel filter, the oil outlet of which is connected to the oil inlet of the diesel pump through a pipeline; as well as a diesel fuel tank, the oil outlet of which is connected to the oil inlet of the diesel filter through a pipeline; The diesel fuel stored in the diesel fuel tank is filtered by the diesel filter and then delivered to the diesel rail by the diesel pump.

4. A control method for a dual-track single-nozzle methanol-diesel dual fuel injection system, characterized in that: It is used for controlling the dual-rail single-nozzle methanol-diesel dual-fuel injection system according to any one of claims 1 to 3, and the control method includes: The methanol pump draws methanol fuel from the methanol fuel tank, and after the methanol filter filters impurities in the methanol fuel, the electronic control unit controls the methanol pressure regulator to control the pressure of the methanol fuel entering the methanol rail, thereby achieving precise control of the methanol injection pressure; The diesel pump extracts the diesel fuel that has passed through the diesel filter from the diesel fuel tank, creates high-pressure diesel, and then delivers it to the diesel rail. The electronic control unit controls the diesel pump to achieve precise control of the diesel injection pressure. The electronic control unit accurately controls the pressure in the methanol rail and the diesel rail by monitoring the data of the pressure sensor in real time; and The two-in-one nozzle is controlled by the electronic control unit, and the electronic control unit controls the two-in-one nozzle to spray a mixture of methanol fuel and diesel fuel in an optimal ratio into the combustion chamber according to calibration data.

5. The control method of the dual-rail single-nozzle methanol-diesel dual fuel injection system according to claim 4, characterized in that: An independent methanol channel and a diesel channel are provided inside the two-in-one nozzle. The electronic control unit controls the methanol rail and the diesel rail to achieve synchronous injection of methanol fuel and diesel fuel through the methanol channel and the diesel channel.

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