Fuel supply system of methanol counterbalance forklift truck

Abstract

The fuel supply system comprises an engine assembly, a gasoline supply assembly, a methanol supply assembly and an engine controller, the gasoline supply assembly is arranged on one side of the engine assembly, the methanol supply assembly is arranged on the other side of the engine assembly, and the engine controller collects information of the engine assembly and sends the information to the methanol supply assembly. The engine assembly comprises an engine, an oil rail oil sprayer, a water temperature sensor, an oil rail pressure sensor and an oxygen sensor, and the water temperature sensor provides water temperature information for the engine controller to control the gasoline supply assembly and the methanol supply assembly to be started and stopped. The oil rail pressure sensor and the oxygen sensor provide oil rail oil sprayer pressure and engine tail gas oxygen content information for the engine controller to control oil spraying time of the oil rail oil sprayer. The environment application range of the methanol forklift truck is expanded, and the low-temperature starting problem is solved; the number of pipelines and connecting points is reduced, arrangement space is saved, and a compact forklift body structure is adapted.

Description

Technical Field

[0001] This invention belongs to the field of fuel supply technology, and in particular relates to a fuel supply system for a methanol counterbalance forklift. Background Technology

[0002] Counterbalance forklifts are commonly used equipment in industrial material handling, and their traditional power sources are mostly diesel, gasoline, or LPG. With increasing environmental protection requirements, methanol fuel is gaining attention due to its cleanliness and low cost. However, methanol fuel faces two major technical bottlenecks in its application: firstly, methanol engines are difficult to start at low temperatures, as methanol has poor vaporization performance in low-temperature environments, making it difficult to form a combustible mixture; secondly, methanol is highly corrosive, easily corroding conventional carbon steel pipes and rubber seals, leading to fuel leaks and system malfunctions.

[0003] Meanwhile, the compact body space of counterbalance forklifts makes it difficult to achieve a large-capacity fuel tank arrangement within a limited space using traditional methods. Using a one-piece welded stainless steel fuel tank would significantly increase manufacturing costs and would be incompatible with the chassis platforms of existing forklifts with different power types, hindering large-scale production. Summary of the Invention

[0004] To at least partially solve the technical problems existing in the prior art, the present invention provides a fuel supply system for a methanol counterbalance forklift.

[0005] The fuel supply system of the methanol counterbalance forklift of the present invention includes an engine assembly, a gasoline supply assembly, a methanol supply assembly, and an engine controller. The gasoline supply assembly is located on one side of the engine assembly and is used to supply gasoline fuel to the engine assembly. The methanol supply assembly is located on the other side of the engine assembly and is used to supply methanol fuel to the engine assembly. The engine controller collects information from the engine assembly and controls the switching between the gasoline supply assembly and the methanol supply assembly to supply fuel to the engine assembly. The engine assembly includes an engine, a fuel rail injector, a coolant temperature sensor, a fuel rail pressure sensor, and an oxygen sensor. The fuel rail injector is mounted on the engine intake manifold, and its control terminal is connected to the output terminal of the engine controller to control the fuel supply to the engine. The coolant temperature sensor is mounted on the engine to detect the engine coolant temperature and is connected to the engine controller's acquisition terminal to provide coolant temperature information to control the start and stop of the gasoline supply assembly and the methanol supply assembly. The fuel rail pressure sensor is mounted on the fuel rail injector to detect the fuel rail injector pressure. The oxygen sensor is mounted on the engine exhaust pipe to detect the oxygen content in the engine exhaust gas. The fuel rail pressure sensor and the oxygen sensor are connected to the engine controller's acquisition terminal to provide the engine controller with information on the fuel rail injector pressure and the oxygen content in the engine exhaust gas to control the fuel injection timing of the fuel rail injector.

[0006] Furthermore, in the fuel supply system of the aforementioned methanol counterbalance forklift, the gasoline supply component includes a gasoline tank, a gasoline pump assembly, and a gasoline pressure regulating valve. The gasoline pump assembly is connected to the gasoline tank, and the output terminal of the engine controller is connected to the control terminal of the gasoline pump assembly for controlling the operation of the gasoline pump assembly. The inlet of the gasoline pressure regulating valve is connected to the outlet of the gasoline pump assembly, and the outlet of the gasoline pressure regulating valve is connected to the inlet of the fuel rail injector for controlling the fuel rail injector inlet pressure. The pressure relief port of the gasoline pressure regulating valve is connected to the gasoline tank return line.

[0007] Furthermore, in the fuel supply system of the aforementioned methanol counterbalance forklift, the methanol supply component includes a methanol tank, a methanol pump assembly, and a methanol pressure regulating valve. The methanol pump assembly is connected to the methanol tank, the output terminal of the engine controller is connected to the control terminal of the methanol pump assembly for controlling the operation of the methanol pump assembly, the inlet of the methanol pressure regulating valve is connected to the outlet of the methanol pump assembly, the outlet of the methanol pressure regulating valve is connected to the inlet of the fuel rail injector for controlling the fuel rail injector inlet pressure, and the pressure relief port of the methanol pressure regulating valve is connected to the methanol tank return line.

[0008] Furthermore, in the fuel supply system of the aforementioned methanol counterbalance forklift, the gasoline pump assembly includes a gasoline pump, a gasoline level gauge, a gasoline filter, and a gasoline hose. The gasoline level gauge is located on one side of the gasoline pump and is used to detect the fuel level in the gasoline tank. The gasoline filter inlet is fixedly mounted on the gasoline pump outlet by bolts. The top of the gasoline filter is connected to the gasoline tank outlet by a flange. The gasoline filter outlet is connected to the gasoline pressure regulating valve inlet through the gasoline hose.

[0009] Furthermore, in the fuel supply system of the aforementioned methanol counterbalance forklift, the methanol pump assembly includes a methanol pump, a methanol level gauge, a methanol filter, and a methanol fuel line. The methanol level gauge is slidably mounted on one side of the methanol pump and is used to detect the amount of methanol in the tank. The top of the methanol pump is connected to the outlet of the methanol tank via a flange. The methanol filter is fixed to the engine via a clamp. The outlet of the methanol pump is connected to the inlet of the methanol filter via the methanol fuel line. The outlet of the methanol filter is connected to the inlet of the methanol pressure regulating valve via the methanol fuel line.

[0010] Furthermore, in the fuel supply system of the aforementioned methanol counterbalance forklift, the methanol fuel line is made of methanol-resistant nylon plastic.

[0011] Furthermore, in the fuel supply system of the aforementioned methanol counterbalance forklift, the methanol tank is made of stainless steel and is bolted to the forklift frame body made of carbon steel Q235.

[0012] Furthermore, in the fuel supply system of the aforementioned methanol counterbalance forklift, the engine controller sets the water temperature threshold for switching the fuel supply to the engine components to 20°C. When the water temperature detected by the water temperature sensor is below 20°C, the engine controller controls the gasoline supply component to work and the methanol supply component to stop working. When the water temperature detected by the water temperature sensor is higher than 20°C, the engine controller controls the methanol supply component to work and the gasoline supply component to stop working.

[0013] The fuel supply system for the methanol counterbalance forklift of the present invention has the following advantages and beneficial effects: By using a dual-fuel supply component design, the gasoline supply component is used to achieve low-temperature start-up, ensuring that the methanol engine can work normally when the water temperature is below 20°C, expanding the environmental applicability of methanol forklifts and effectively solving the problem of low-temperature start-up. Both gasoline and methanol supply components adopt an integrated layout, which significantly reduces the number of pipelines and connection points, reduces the risk of fuel leakage, saves layout space, and is compatible with the compact body structure of forklifts. Attached Figure Description

[0014] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only for further understanding of the embodiments of the present invention and constitute a part of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort. In the drawings: Figure 1 This is a control principle diagram of the fuel supply system of the methanol counterbalance forklift of the present invention. Figure 2 This is a schematic diagram of the overall structure of the fuel supply system of the methanol counterbalance forklift of the present invention. Figure 3 This is a schematic diagram of the fuel supply system of the methanol counterbalance forklift of the present invention.

[0015] Explanation of reference numerals in the attached figures: 1: Engine components; 11: Engine; 12: Water temperature sensor; 13: Fuel rail injector; 14: Fuel rail pressure sensor; 15: Oxygen sensor. 2: Gasoline supply assembly; 21: Gasoline tank; 22: Fuel pump assembly; 221: Fuel pump; 222: Fuel level gauge; 223: Fuel filter; 224: Fuel line; 23: Gasoline pressure regulating valve; 3: Methanol supply components; 31: Methanol fuel tank; 32: Methanol pump assembly; 321: Methanol pump; 322: Methanol level gauge; 323: Methanol filter; 324: Methanol oil pipe; 33: Methanol pressure regulating valve; 4: Engine controller. Detailed Implementation

[0016] To make the objectives, technical solutions, and advantages of this invention clearer, the technical solutions of this invention will be clearly and completely described below in conjunction with specific embodiments and corresponding drawings. Obviously, the described embodiments are only a part of the embodiments of this invention, and not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of this invention without creative effort are within the scope of protection of this invention.

[0017] like Figures 1 to 3 As shown, the fuel supply system of the methanol counterbalance forklift of the present invention includes an engine assembly 1, a gasoline supply assembly 2, a methanol supply assembly 3, and an engine controller 4. The gasoline supply assembly 2 is located on one side of the engine assembly 1 and is used to supply gasoline fuel to the engine assembly 1. The methanol supply assembly 3 is located on the other side of the engine assembly 1 and is used to supply methanol fuel to the engine assembly 1. The engine controller 4 collects information from the engine assembly 1 and controls the switching between the gasoline supply assembly 2 and the methanol supply assembly 3 to supply fuel to the engine assembly 1, wherein: The engine assembly includes an engine 11, a fuel rail injector 13, a coolant temperature sensor 12, a fuel rail pressure sensor 14, and an oxygen sensor 15. The fuel rail injector 13 is mounted on the intake manifold of the engine 11. The control terminal of the fuel rail injector 13 is connected to the output terminal of the engine controller 4 to control the fuel supply of fuel to the engine 11. The coolant temperature sensor 12 is mounted on the engine 11 to detect the coolant temperature. The coolant temperature sensor 12 is connected to the acquisition terminal of the engine controller 4 to provide coolant temperature information to the engine controller 4 to control the start and stop of the gasoline supply assembly 2 and the methanol supply assembly 3. The fuel rail pressure sensor 14... The fuel rail injector 13 is mounted on the fuel rail injector 13 to detect its pressure. The oxygen sensor 15 is mounted on the exhaust pipe of the engine 11 to detect the oxygen content in the engine exhaust gas. The fuel rail pressure sensor 14 and the oxygen sensor 15 are connected to the acquisition terminal of the engine controller 4 to provide the engine controller 4 with information on the fuel rail injector 13 pressure and the oxygen content in the engine exhaust gas to control the fuel rail injector 13 injection time. Thus, the fuel rail pressure sensor 14 monitors the fuel rail injector 13 pressure in real time, and the engine controller 4 adjusts the fuel rail injector 13 injection time according to power requirements and the oxygen content in the engine exhaust gas detected by the oxygen sensor 15.

[0018] Furthermore, in the fuel supply system of the aforementioned methanol counterbalance forklift, the gasoline supply component 2 includes a gasoline tank 21, a gasoline pump assembly 22, and a gasoline pressure regulating valve 23. The gasoline pump assembly 22 is connected to the gasoline tank 21, and the output terminal of the engine controller 4 is connected to the control terminal of the gasoline pump assembly 22 to control the operation of the gasoline pump assembly 22. The inlet of the gasoline pressure regulating valve 23 is connected to the outlet of the gasoline pump assembly 22, and the outlet of the gasoline pressure regulating valve 23 is connected to the inlet of the fuel rail injector 13 to control the inlet pressure of the fuel rail injector 13. The pressure relief port of the gasoline pressure regulating valve 23 is connected to the return line of the gasoline tank 21, thereby enabling the engine controller 4 to control the operation of the gasoline pump assembly 22 according to the water temperature information, and to provide the fuel rail injector 13 with a stable pressure of 4 bar gasoline after the pressure is regulated by the gasoline pressure regulating valve 23.

[0019] Furthermore, in the fuel supply system of the aforementioned methanol counterbalance forklift, the methanol supply component 3 includes a methanol tank 31, a methanol pump assembly 32, and a methanol pressure regulating valve 33. The methanol pump assembly 32 is connected to the methanol tank 31. The output terminal of the engine controller 4 is connected to the control terminal of the methanol pump assembly 32 to control the operation of the methanol pump assembly 32. The inlet of the methanol pressure regulating valve 33 is connected to the outlet of the methanol pump assembly 32, and the outlet of the methanol pressure regulating valve 33 is connected to the inlet of the fuel rail injector 13 to control the fuel rail injector 13 inlet pressure. The pressure relief port of the methanol pressure regulating valve 33 is connected to the return line of the methanol tank 31, thereby enabling the engine controller 4 to control the operation of the methanol pump assembly 32 according to the water temperature information, and to provide the fuel rail injector 13 with methanol at a stable pressure of 4 bar after the pressure is regulated by the methanol pressure regulating valve 33.

[0020] Furthermore, in the fuel supply system of the aforementioned methanol counterbalance forklift, the gasoline pump assembly 22 includes a gasoline pump 221, a gasoline level gauge 222, a gasoline filter 223, and a gasoline hose 224. The gasoline level gauge 222 is located on one side of the gasoline pump 221 and is used to detect the fuel level in the gasoline tank 21. The inlet of the gasoline filter 223 is fixedly mounted on the outlet of the gasoline pump 221 by bolts. The top of the gasoline filter 223 is connected to the outlet of the gasoline tank 21 by a flange. The outlet of the gasoline filter 223 is connected to the inlet of the gasoline pressure regulating valve 23 through the gasoline hose 224, thereby making the gasoline pump assembly 22 an integral structure installed inside the gasoline tank 21, which facilitates maintenance and individual replacement of parts.

[0021] Furthermore, in the fuel supply system of the aforementioned methanol counterbalance forklift, the methanol pump assembly 32 includes a methanol pump 321, a methanol level gauge 322, a methanol filter 323, and a methanol oil pipe 324. The methanol level gauge 322 is slidably disposed on one side of the methanol pump 321 and is used to detect the amount of methanol in the methanol tank 31. The top of the methanol pump 321 is connected to the outlet of the methanol tank 31 via a flange. The methanol filter 323 is fixed to the engine 11 by a clamp. The outlet of the methanol pump 321 is connected to the inlet of the methanol filter 323 via the methanol oil pipe 324. The outlet of the methanol filter 323 is connected to the inlet of the methanol pressure regulating valve 33 via the methanol oil pipe 324. Thus, the methanol pump assembly 32 is installed as a single unit inside the methanol tank 31, which facilitates maintenance and individual replacement of parts, and ensures that the engine 11 is provided with a stable methanol pressure of 4 bar and methanol that meets the combustion conditions.

[0022] Furthermore, in the fuel supply system of the aforementioned methanol counterbalance forklift, the methanol oil pipe 324 is made of methanol-resistant nylon plastic, thereby preventing methanol from corroding the oil circuit.

[0023] Furthermore, in the fuel supply system of the aforementioned methanol counterbalance forklift, the methanol tank 31 is made of stainless steel and is bolted to the forklift frame body made of carbon steel Q235, thereby preventing methanol from corroding the tank.

[0024] Furthermore, in the fuel supply system of the methanol counterbalance forklift described above, the engine controller 4 sets the water temperature threshold for switching the fuel supply to the engine assembly 1 to 20°C. When the water temperature detected by the water temperature sensor 12 is below 20°C, the engine controller 4 controls the gasoline supply component 2 to work and the methanol supply component 3 to stop working. When the water temperature detected by the water temperature sensor 12 is higher than 20°C, the engine controller 4 controls the methanol supply component 3 to work and the gasoline supply component 2 to stop working.

[0025] Specifically, when engine 11 starts, engine controller 4 controls the operation of gasoline supply component 2 or methanol supply component 3 based on the water temperature information collected by water temperature sensor 12. When engine sensor 12 detects that the water temperature of engine 11 is below 20°C, engine controller 4 controls gasoline pump 221 to start. Gasoline in gasoline tank 21 is pumped out by gasoline pump 221, filtered by gasoline filter 223, and then enters gasoline pressure regulating valve 23 to regulate the pressure, ensuring that the gasoline pressure is stable at 4 bar. When the pressure is greater than 4 bar, the pressure is released through the pressure relief port of gasoline pressure regulating valve 23. When the pressure is less than 4 bar, the pressure is held up, and the appropriate gasoline is delivered to fuel rail injector 13. The gasoline injector on fuel rail injector 13 injects gasoline into the intake manifold of engine 11, where it mixes with air to form a combustible mixture. After ignition, it provides power to engine 11 and heats the engine block. When engine 11 starts working, when water temperature sensor 12 detects that the water temperature of engine 11 is higher than 20°C, engine controller 4 controls gasoline pump 221 to stop working and simultaneously starts methanol pump 321 to work, and methanol tank Methanol is pumped out by methanol pump 321, filtered by methanol filter 323, and then enters methanol pressure regulating valve 33 to regulate the pressure, ensuring that the methanol pressure is stable at 4 bar. When the pressure is greater than 4 bar, the pressure is released through the pressure relief port of methanol pressure regulating valve 33. When the pressure is less than 4 bar, the pressure is held up, and the gasoline is delivered to the fuel rail injector 13. The methanol injector on the fuel rail injector 13 injects it into the intake manifold to provide power to engine 11. When the fuel rail pressure sensor 14 detects that the pressure of the fuel rail injector 13 is high, and the engine controller 4 adjusts the injection time of the fuel rail injector 13 to reduce the power demand and the oxygen content in the engine exhaust gas detected by oxygen sensor 15 to ensure that the fuel and oxygen concentration ratio is within the design range. When the fuel rail pressure sensor 14 detects that the pressure of the fuel rail injector 13 is low, and the engine controller 4 adjusts the injection time of the fuel rail injector 13 to increase the power demand and the oxygen content in the engine exhaust gas detected by oxygen sensor 15 to ensure that the fuel and oxygen concentration ratio is within the design range.

[0026] In summary, compared with the prior art, the fuel supply system of the methanol counterbalance forklift of the present invention has the following advantages and beneficial effects: through the dual fuel supply component design, the gasoline supply component is used to achieve low temperature start-up, ensuring that the methanol engine can work normally when the water temperature is below 20°C, expanding the environmental applicability range of the methanol forklift, and effectively solving the problem of low temperature start-up. Both gasoline and methanol supply components adopt an integrated layout, which significantly reduces the number of pipelines and connection points, reduces the risk of fuel leakage, saves layout space, and is compatible with the compact body structure of forklifts.

[0027] It should be noted that, unless otherwise expressly specified and limited, the term "connection" or its synonyms should be interpreted broadly in this document. For example, "connection" can be a fixed connection or a detachable connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can be the internal communication of two elements or the interaction between two elements. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances. Furthermore, expressions such as "first" and "second" are merely used to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Meanwhile, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. In addition, the terms "front," "rear," "left," "right," "upper," and "lower" in this document refer to the placement states shown in the accompanying drawings.

[0028] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A fuel supply system for a methanol counterbalanced fork lift truck, characterized by, The fuel supply system of the methanol balance forklift truck comprises an engine assembly, a gasoline supply assembly, a methanol supply assembly and an engine controller, the gasoline supply assembly is arranged on one side of the engine assembly for supplying gasoline fuel to the engine assembly, the methanol supply assembly is arranged on the other side of the engine assembly for supplying methanol fuel to the engine assembly, the engine controller collects information of the engine assembly and controls the gasoline supply assembly and the methanol supply assembly to switch and supply oil to the engine assembly, wherein: The engine assembly comprises an engine, an oil rail injector, a water temperature sensor, an oil rail pressure sensor and an oxygen sensor, the oil rail injector is arranged on an intake manifold of the engine, a control end of the oil rail injector is connected with an output end of the engine controller for controlling the oil rail injector to supply oil to the engine, the water temperature sensor is arranged on the engine for detecting water temperature of the engine, the water temperature sensor is connected with a collection end of the engine controller for providing water temperature information to the engine controller to control the gasoline supply assembly and the methanol supply assembly to start and stop, the oil rail pressure sensor is arranged on the oil rail injector for detecting pressure of the oil rail injector, the oxygen sensor is arranged on an exhaust pipe of the engine for detecting oxygen content of exhaust gas of the engine, the oil rail pressure sensor and the oxygen sensor are connected with the collection end of the engine controller for providing pressure information of the oil rail injector and oxygen content information of the exhaust gas of the engine to the engine controller to control oil injection time of the oil rail injector.

2. The fuel supply system of the methanol counterbalanced fork truck according to claim 1, characterized by The gasoline supply assembly comprises a gasoline tank, a gasoline pump assembly and a gasoline pressure regulating valve, the gasoline pump assembly is connected with the gasoline tank, an output end of the engine controller is connected with a control end of the gasoline pump assembly for controlling the gasoline pump assembly to work, an oil inlet of the gasoline pressure regulating valve is connected with an oil outlet of the gasoline pump assembly, an oil outlet of the gasoline pressure regulating valve is connected with an oil inlet of the oil rail injector for controlling oil inlet pressure of the oil rail injector, and a pressure relief port of the gasoline pressure regulating valve is connected with an oil return pipeline of the gasoline tank.

3. The fuel supply system of the methanol counterbalanced fork truck according to claim 1, characterized by The methanol supply assembly comprises a methanol tank, a methanol pump assembly and a methanol pressure regulating valve, the methanol pump assembly is connected with the methanol tank, an output end of the engine controller is connected with a control end of the methanol pump assembly for controlling the methanol pump assembly to work, an oil inlet of the methanol pressure regulating valve is connected with an oil outlet of the methanol pump assembly, an oil outlet of the methanol pressure regulating valve is connected with an oil inlet of the oil rail injector for controlling oil inlet pressure of the oil rail injector, and a pressure relief port of the methanol pressure regulating valve is connected with an oil return pipeline of the methanol tank.

4. The fuel supply system of the methanol counterbalanced fork truck according to claim 2, characterized by The gasoline pump assembly comprises a gasoline pump, a gasoline liquid level meter, a gasoline filter and a gasoline oil pipe, the gasoline liquid level meter is arranged on one side of the gasoline pump for detecting oil amount of the gasoline tank, an oil inlet of the gasoline filter is fixedly arranged on an oil outlet of the gasoline pump through bolts, a top of the gasoline filter is connected with an oil outlet of the gasoline tank through a flange, and an oil outlet of the gasoline filter is connected with the oil inlet of the gasoline pressure regulating valve through the gasoline oil pipe.

5. The fuel supply system of the methanol counterbalanced fork truck according to claim 3, wherein The methanol pump assembly comprises a methanol pump, a methanol liquid level meter, a methanol filter and a methanol oil pipe, the methanol liquid level meter is slidably arranged on one side of the methanol pump and used for detecting the oil amount of the methanol oil tank, the top of the methanol pump is connected with the oil outlet of the methanol oil tank through a flange, the methanol filter is fixed on the engine through a clamp, the oil outlet of the methanol pump is connected with the oil inlet of the methanol filter through the methanol oil pipe, and the oil outlet of the methanol filter is connected with the oil inlet of the methanol pressure regulating valve through the methanol oil pipe.

6. The fuel supply system of the methanol counterbalanced fork truck according to claim 5, wherein The methanol oil pipe is made of methanol-resistant nylon plastic.

7. The fuel supply system of the methanol counterbalanced fork truck according to claim 3, wherein The methanol oil tank is made of stainless steel and is assembled on the forklift frame main body made of carbon steel Q235 through bolts.

8. The fuel supply system of the methanol counterbalanced fork truck according to claim 1, characterized by The engine controller sets the water temperature threshold for switching the oil supply of the engine assembly to 20℃; When the water temperature detected by the water temperature sensor is lower than 20℃, the engine controller controls the gasoline supply assembly to work and the methanol supply assembly to stop working; When the water temperature detected by the water temperature sensor is higher than 20℃, the engine controller controls the methanol supply assembly to work and the gasoline supply assembly to stop working.

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