A methanol engine with internal direct injection structure

Abstract

The application provides a methanol engine with an internal direct injection structure applied to the field of methanol engines, wherein the valve is directly installed in the interior of the cylinder, the methanol fuel can be directly atomized and injected in the interior of the cylinder, loss caused by injection of the methanol fuel in the intake pipe can be avoided, the first fuel injection is performed when the piston moves from the top dead center to 1 / 2 of the total stroke, the second fuel injection is performed when the piston moves to the bottom dead center position, the two fuel injections are performed in stages, the mixing effect of the two fuel injections can be enhanced by the disturbance of the air flow in the cylinder, the methanol fuel combustion efficiency is improved to a certain extent, fuel loss in the starting process of the methanol engine is reduced, the methanol fuel is fully combusted, the working efficiency is effectively improved, and the methanol engine is more economical and environmentally friendly.

Description

TECHNICAL FIELD

[0001] The application relates to the field of methanol engines, in particular to a methanol engine with an internal direct injection structure. BACKGROUND

[0002] The methanol engine is an engine using methanol as a substitute fuel, and has more obvious advantages in economy and emission compared with oil engines (gasoline engines and diesel engines). Therefore, the methanol engine is widely applied to mining and commercial mechanical equipment to provide power output.

[0003] In the prior art, the fuel supply system of the methanol engine is usually arranged in an air intake pipe, a nozzle for injecting methanol fuel is arranged in the air intake pipe, and the fuel is atomized and injected in the air intake process, so that the methanol fuel is mixed with the air flow in the air intake pipe and enters the cylinder together to be ignited to work. Since the air intake pipe and the cylinder have a certain distance, the fuel injection in this way causes a certain loss of the fuel mixed and transported in the air intake pipe, which leads to fuel waste and insufficient and uneven fuel mixing, and affects the working efficiency of the ignited fuel.

[0004] Therefore, the methanol engine with the internal direct injection structure is provided to solve the problems in the prior art and improve the fuel utilization rate and working efficiency of the methanol engine. SUMMARY

[0005] The application aims to improve the fuel utilization rate and working efficiency of the methanol engine, and provides a methanol engine with an internal direct injection structure compared with the prior art, which comprises a cylinder body and an engine controller, a vertical cylinder is arranged above the inside of the cylinder body, a crankcase communicating with the cylinder is arranged below the inside of the cylinder body, a piston is slidably arranged in the inside of the cylinder, the lower end of the piston is rotatably connected with a connecting rod, a horizontally arranged crankshaft is rotatably arranged in the inside of the crankcase, and the lower end of the connecting rod extends into the inside of the crankcase and is rotatably connected with the crankshaft.

[0006] A cylinder cover covering the cylinder is fixedly arranged on the top of the cylinder body, an intake valve and an exhaust valve communicating with the cylinder are arranged in the inside of the cylinder cover, a valve is slidably arranged in the inside of the intake valve and the exhaust valve, a spark plug and a nozzle extending into the inside of the cylinder are arranged on the cylinder cover, a cam mechanism for controlling the up-and-down movement of the valve is arranged on the upper end of the valve, a main oil pump is fixedly arranged on the outside of the cylinder body, the oil outlet of the main oil pump is in communication with the nozzle, and an oil supply pipe is connected to the oil inlet of the main oil pump.

[0007] By directly installing the valve in the interior of the cylinder, the methanol fuel can be directly atomized and injected in the interior of the cylinder, which is beneficial to avoid the loss caused by the injection of the methanol fuel in the intake pipe, and the injection in the cylinder, the mixing caused by the air flow disturbance of the intake and compression can directly improve the mixing uniformity of the methanol fuel and the gas, and further improve the methanol fuel combustion efficiency to a certain extent, which is beneficial to reduce the fuel loss in the starting process of the methanol engine, fully burn the fuel, and effectively improve the work efficiency, which is more economical and environmental protection.

[0008] Further, the intake valve and the exhaust valve are both provided with two, and the two intake valves and the two exhaust valves are symmetrically arranged on the left and right sides of the interior of the cylinder head.

[0009] Further, the nozzle is also provided with two, and the two nozzles are respectively installed at the middle positions of the two symmetrically arranged intake valves and the two symmetrically arranged exhaust valves, and the spark plug is installed at the middle position of the interior of the cylinder head and corresponds to the center of the top of the cylinder.

[0010] Further, the lower end of the nozzle is provided as an inclined structure deviated from the center of the top of the cylinder.

[0011] Further, the top of the piston is provided with a groove corresponding to the valves, and the bottom of the groove is provided in parallel with the bottom of the valve in the corresponding direction, and the bottom of the valve is provided with an upwardly recessed arc-shaped notch.

[0012] Optionally, it further comprises a top cover fixedly covered on the top of the cylinder head, one side of the top of the cylinder head is provided with an intake cavity in communication with the two intake valves, and the other side of the top of the cylinder head is provided with an exhaust cavity in communication with the two exhaust valves, the top of the top cover is fixedly installed with an intake pipe and an exhaust pipe, and the intake pipe and the exhaust pipe are respectively communicated to the interior of the intake cavity and the exhaust cavity, and the intake pipe and the exhaust pipe extend to the same side direction and are spirally wound.

[0013] Further, a plurality of heat-conducting discs are fixedly arranged on the outer end wall of the intake pipe and the exhaust pipe.

[0014] Optionally, a preheating oil pipe located on the top of the top cover is fixedly communicated between the two nozzles, a T-shaped pipe is communicated at the middle position of the preheating oil pipe, an auxiliary oil pump symmetrically arranged with the main oil pump is also fixedly installed on the top of the top cover, the other two ends of the T-shaped pipe are respectively communicated with the oil outlet of the main oil pump and the oil inlet of the auxiliary oil pump, and one-way valves are installed at the communication positions, and the oil outlet of the auxiliary oil pump is communicated with a temporary storage tank, and the bottom of the temporary storage tank is communicated with the oil supply pipe, and one-way valves are also installed at the communication positions.

[0015] Further, the outer side of the oil supply pipe is fixedly wrapped with a protective sleeve located between the main oil pump and the temporary storage tank, and the inside of the protective sleeve is provided with an electric heating wire, and a plurality of vertically arranged metal sheets a are fixedly arranged on the inner end wall of the oil supply pipe inside the protective sleeve, and a plurality of metal sheets b are fixedly arranged on the top of the top cover.

[0016] A control method of a methanol engine with an internal direct injection structure, when the methanol engine is in an intake stroke, an engine controller calculates the amount of methanol required for a single combustion, as a unit fuel amount, a cam mechanism controls the downward movement of the intake valve in the intake valve, so that the intake valve is opened, and the synchronous piston moves from top to bottom inside the cylinder to perform the suction operation, when the piston moves from the top dead center in the cylinder to 1 / 2 of the total stroke, the engine controller controls the main oil pump to start, 50% of the unit fuel amount of methanol is sprayed into the cylinder in the form of atomization through the nozzle, the sprayed methanol is preheated by the temperature in the engine cylinder, when the piston moves from 1 / 2 of the total stroke to the bottom dead center position in the cylinder, the engine controller controls the main oil pump to spray the remaining 50% of the unit fuel amount of methanol into the cylinder in the form of atomization again, forming the secondary injection mixing of methanol fuel.

[0017] Compared with the prior art, the advantages of the present application are:

[0018] (1) The present application directly installs the valve in the inside of the cylinder, which can directly spray the methanol fuel in the inside of the cylinder, which is beneficial to avoid the loss caused by the injection of methanol fuel in the intake pipe, and directly injects in the cylinder, cooperates with the mixing caused by the air flow disturbance of the intake and compression, which can more directly improve the uniformity of methanol fuel and gas mixing, and thus improve the methanol fuel combustion efficiency to a certain extent, which is beneficial to reduce the fuel consumption during the operation of the methanol engine, fully burn the fuel, and effectively improve the work efficiency, which is more economical and environmental protection.

[0019] (2) By providing two intake valves and two exhaust valves, the internal intake efficiency and exhaust emission efficiency during the operation of a single cylinder can be effectively improved, and the stability and efficiency of the methanol engine during operation can be improved to a certain extent.

[0020] (3) By extending the two nozzles into the inside of the cylinder, the methanol fuel can be atomized and injected on both sides of the cylinder, which is beneficial to improve the uniformity of fuel injection, further improve the uniformity and sufficiency of fuel mixing in the cylinder, and more effectively improve the fuel combustion efficiency in the cylinder, and the spark plug is arranged at the middle position, which can be ignited from the middle position, and the ignition is in the middle, which is beneficial to ensure the smoothness of the piston being pushed to do work, and is beneficial to reduce the probability of knock.

[0021] (4) By setting the lower end of the nozzle to be inclined to the cylinder circular position, the concentration of the atomized fuel after spraying can be effectively improved, which is beneficial to further improve the uniformity of fuel mixing and the uniformity of combustion after ignition.

[0022] (5) By opening a groove on the top of the piston and an arc-shaped notch on the bottom of the valve, the direction of the airflow during compression can be changed, thereby effectively improving the mixing effect of methanol fuel and intake air. The presence of the groove can provide space for the movement of the valve and improve the combustion chamber volume, thereby effectively improving the work efficiency of the methanol engine.

[0023] (6) By intertwining the intake pipe and the exhaust pipe in a spiral structure, the high-temperature exhaust gas can be used to preheat the intake air, thereby improving the combustion efficiency in the cylinder.

[0024] (7) By fixing a plurality of heat-conducting plates arranged side by side between the outer end walls of the intake pipe and the exhaust pipe, the structural connection strength between the intake pipe and the exhaust pipe is improved to some extent, and the heat conduction area between the intake pipe and the exhaust pipe is also effectively increased, which is beneficial to improve the efficiency of preheating the intake air by high-temperature exhaust gas.

[0025] (8) By connecting the oil inlet of the auxiliary oil pump with one end of the T-shaped pipe, the methanol engine can use the auxiliary oil pump to remove the residual fuel in the nozzle, preheating oil pipe and T-shaped pipe before starting, avoiding the interference of inaccurate residual fuel quantity measurement on the calculation of single fuel injection quantity when the device starts, and improving the control accuracy of fuel injection quantity of the engine.

[0026] (9) By wrapping the protective sleeve with electric heating wire around the outside of the oil supply pipe, the fuel can be preheated during fuel injection when the device starts, which improves the initial temperature of the fuel and improves its combustion efficiency. By setting a metal sheet b to transfer the heat generated by the fuel combustion in the cylinder, the electric heating wire can be turned off during normal operation of the engine, which can preheat the fuel and save energy.

[0027] (10) By injecting fuel for the first time when the piston moves from the top dead center to half of its total stroke, and injecting fuel for the second time when the piston moves to the bottom dead center position, the unit fuel injection formed by two-stage injection can enhance the mixing effect of the two fuel injections by the disturbance of the intake airflow in the cylinder, thereby further improving the uniformity and sufficiency of fuel and intake air mixing, which is beneficial to improve the efficiency of fuel combustion in the cylinder. BRIEF DESCRIPTION OF DRAWINGS

[0028] Figure 1 is the structure of the present application.

[0029] Figure 2 for Figure 1 structure diagram at A in the middle;

[0030] Figure 3 for the right perspective view of the application;

[0031] Figure 4 for the left perspective view of the application;

[0032] Figure 5 for the top view of the application;

[0033] Figure 6 for the right side sectional view of the application;

[0034] Figure 7 for the top sectional view of the application;

[0035] Figure 8 for the bottom structure diagram of the cylinder cover of the application;

[0036] Figure 9 for the split diagram of the internal structure of the cylinder cover and the top cover of the application;

[0037] Figure 10 for Figure 9 the top view of the structure.

[0038] Explanation of the figure:

[0039] 1, cylinder block; 101, cylinder; 102, crankcase; 103, piston; 104, connecting rod; 105, crankshaft; 2, cylinder cover; 201, intake valve; 202, exhaust valve; 203, valve; 204, spark plug; 205, nozzle; 3, cam mechanism; 4, top cover; 401, intake cavity; 402, exhaust cavity; 403, intake pipe; 404, exhaust pipe; 405, heat conduction disc; 5, preheating oil pipe; 501, T-shaped pipe; 502, main oil pump; 503, auxiliary oil pump; 504, oil supply pipe; 505, temporary storage tank; 6, protective sleeve; 601, metal sheet a; 602, metal sheet b. DETAILED DESCRIPTION

[0040] The embodiments will be described in conjunction with the drawings in the specification, and all other embodiments obtained by those skilled in the art based on the embodiments in the specification without creative labor shall fall within the scope of protection of the application. EMBODIMENT

[0041] The application provides a methanol engine with an internal direct injection structure, please refer to Figure 1 - Figure 10, including a cylinder block 1 and an engine controller, a vertical cylinder 101 is arranged on the top of the inside of the cylinder block 1, a crankcase 102 is arranged on the bottom of the inside of the cylinder block 1 and is communicated with the cylinder 101, a piston 103 is slidably arranged in the cylinder 101, the lower end of the piston 103 is rotatably connected with a connecting rod 104, a crankshaft 105 is rotatably arranged in the crankcase 102, the lower end of the connecting rod 104 extends into the crankcase 102 and is rotatably connected with the crankshaft 105;

[0042] A cylinder cover 2 is fixedly arranged on the top of the cylinder block 1 and covers the cylinder 101, an intake valve 201 and an exhaust valve 202 are arranged in the cylinder cover 2 and are communicated with the cylinder 101, a valve 203 is slidably arranged in the intake valve 201 and the exhaust valve 202, a spark plug 204 and a nozzle 205 are arranged on the cylinder cover 2 and extend into the cylinder 101, a cam mechanism 3 is arranged on the upper end of the valve 203 and is used for controlling the up-and-down movement of the valve 203, a main oil pump 502 is fixedly arranged on the outside of the cylinder block 1, the oil outlet of the main oil pump 502 is communicated with the nozzle 205, and a supply pipe 504 is arranged on the oil inlet of the main oil pump 502.

[0043] During the starting process of the methanol engine, the cam mechanism 3 can control the up-and-down movement of the corresponding valve 203 in the intake valve 201 and the exhaust valve 202 according to the up-and-down movement state of the piston 103 and the rotation state of the crankshaft 105, and control the opening and closing of the intake valve 201 and the exhaust valve 202, the piston 103 moves down, up, down and up in the cylinder 101 during the four processes of the starting process of the methanol engine, which are intake stroke, compression stroke, working stroke and exhaust stroke, the engine controller is used for coordinately controlling the parameters and electrical operation during the starting process of the methanol engine, the above content is the basic technology of the engine operation in the prior art and is the commonly known knowledge in the prior art, so it is not described in detail here.

[0044] In the methanol engine in the application, when it is in the intake stroke during the starting process, the piston 103 moves downward in the interior of the cylinder 101, at this time, the external gas enters the interior of the cylinder 101 through the opened intake valve 201, synchronously, the main oil pump 502 is controlled to start, and the methanol delivered in the oil supply pipe 504 is directly sprayed in the interior of the cylinder 101 in the form of atomization through the nozzle 205, in the compression stroke, the piston 103 moves from the bottom dead center to the top dead center in the interior of the cylinder 101, realizing the mixing and compression of the methanol and the intake air, then the mixed methanol gas after compression is ignited by the spark plug 204, so that the impact force is generated to push the piston 103 to move downward to enter the working stroke, realizing the working operation of the engine, after the working is completed, the piston 103 moves upward to enter the exhaust stroke, in this process, the exhaust valve 202 is opened, and the exhaust gas generated by the combustion in the cylinder 101 is pushed out through the exhaust valve 202 by the upward movement of the piston 103.

[0045] In the application, by directly installing the valve 203 in the interior of the cylinder 101, the atomization spraying of the methanol fuel can be directly performed in the interior of the cylinder 101, which is beneficial to avoid the loss caused by the spraying of the methanol fuel in the intake pipe, and the spraying is directly performed in the cylinder 101, which can more directly improve the uniformity of the mixing of the methanol fuel and the gas, and further improve the combustion efficiency of the methanol fuel to a certain extent, which is beneficial to reduce the fuel loss during the starting process of the methanol engine, fully burn the fuel, and effectively improve the working efficiency, and is more economical and environmentally friendly.

[0046] Please refer to Figure 2 and Figure 8 The intake valve 201 and the exhaust valve 202 are both provided with two, the two intake valves 201 and the two exhaust valves 202 are symmetrically arranged on the left and right sides in the interior of the cylinder head 2, during the starting process of the methanol engine, the two intake valves 201 are simultaneously opened during the intake stroke, and the two exhaust valves 202 are simultaneously opened during the exhaust stroke, by providing the two intake valves 201 and the two exhaust valves 202, the internal intake efficiency and the exhaust emission efficiency during the starting process of the single cylinder 101 can be effectively improved, and the stability and efficiency during the running process of the methanol engine are improved to a certain extent.

[0047] Please refer to Figure 2 and Figure 8, two nozzles 205 are symmetrically arranged in the middle of the two intake valves 201, and two nozzles 205 are symmetrically arranged in the middle of the two exhaust valves 202, and the spark plug 204 is arranged in the middle of the cylinder head 2 and corresponds to the top center of the cylinder 101, and in the operation of the methanol engine, the two nozzles 205 are connected with the oil outlet of the main oil pump 502, and when the main oil pump 502 is started to pump oil, the fuel can be atomized and injected into the cylinder 101 through the two nozzles 205 at the same time, and the two nozzles 205 are extended into the cylinder 101, and the methanol fuel can be atomized and injected on both sides of the cylinder 101 at the same time, which is beneficial to improve the uniformity of fuel injection, further improve the uniformity of fuel mixing in the cylinder 101, and more effectively improve the fuel combustion efficiency in the cylinder 101, and the spark plug 204 is arranged in the middle position, and the fuel ignition operation is performed from the middle position, and the ignition is in the middle, which is beneficial to ensure the smoothness of the piston 103 being pushed to work, and is beneficial to reduce the probability of knocking.

[0048] Please refer to Figure 6 The lower end of the nozzle 205 is inclined to the top center of the cylinder 101, and in the operation of the methanol engine, by arranging the lower end of the nozzle 205 to be inclined to the circular position of the cylinder 101, the concentration of the atomized fuel after being sprayed out can be more effectively improved, which is beneficial to further improve the uniformity of fuel mixing and the uniformity of combustion after being ignited.

[0049] Please refer to Figure 7 and Figure 8 The top of the piston 103 is provided with a groove corresponding to the plurality of valves 203, and the bottom of the groove is arranged to be parallel to the bottom of the valve 203 in the corresponding direction, and the bottom of the valve 203 is provided with an upwardly recessed arc-shaped notch, and in the operation of the methanol engine, by arranging the groove on the top of the piston 103 and the arc-shaped notch on the bottom of the valve 203, the pushing direction of the compressed gas flow can be changed, thereby effectively improving the mixing effect of methanol fuel and intake air, and the existence of the groove can provide a certain space for the movement of the valve 203, improve the combustion chamber volume, and thereby effectively improve the working efficiency of the methanol engine. Embodiment

[0050] The present application provides a methanol engine with an internal direct injection structure, please refer to Figure 1 - Figure 10Also include the top cover 4 fixed cover in the top of the cylinder head 2, the top of the cylinder head 2 side is provided with two intake valve 201 communication with the intake chamber 401, the top of the cylinder head 2 the other side is provided with two exhaust valve 202 communication with the exhaust chamber 402, the top of the top cover 4 is fixedly installed with intake pipe 403 and exhaust pipe 404, and the intake pipe 403 and exhaust pipe 404 are communicated to the intake chamber 401 and exhaust chamber 402 inside, the intake pipe 403 and exhaust pipe 404 extend to the same side direction, and are spirally wound.

[0051] The methanol engine starting process, when in the intake stroke, the outside gas enters into the intake chamber 401 through the intake pipe 403, and then enters into the cylinder 101 through the opened intake valve 201, and mixes with the fuel injected into the cylinder 101, when in the exhaust stroke, the exhaust gas generated by the combustion in the cylinder 101 is pushed upward by the piston 103, enters into the exhaust chamber 402 through the opened exhaust valve 202, and then is discharged outward through the exhaust pipe 404, since the exhaust gas generated by the combustion of methanol fuel has a high temperature, the intake pipe 403 and the exhaust pipe 404 are spirally wound, the high-temperature exhaust gas can be used to preheat the intake, the intake temperature is improved, and the combustion efficiency in the cylinder 101 is effectively improved.

[0052] Please refer to Figure 10 The outer end wall of the intake pipe 403 and the exhaust pipe 404 is fixedly provided with a plurality of heat-conducting discs 405 arranged side by side, in the methanol engine starting process, the plurality of heat-conducting discs 405 arranged side by side are fixedly installed between the outer end walls of the intake pipe 403 and the exhaust pipe 404, which improves the structural connection strength between the intake pipe 403 and the exhaust pipe 404 to some extent, and effectively enhances the heat conduction area between the intake pipe 403 and the exhaust pipe 404, which is beneficial to improving the efficiency of preheating the intake by the high-temperature exhaust gas. Embodiment

[0053] The present application provides a kind of methanol engine with inner direct injection structure, please refer to Figure 1 - Figure 10 Two nozzles 205 are fixedly communicated with preheating oil pipe 5 located in the top of top cover 4, and T-shaped pipe 501 is communicated at the middle position of preheating oil pipe 5, auxiliary oil pump 503 is fixedly installed on the top of top cover 4 and is symmetrically arranged with main oil pump 502, other two ends of T-shaped pipe 501 are respectively communicated with the oil outlet of main oil pump 502 and the oil inlet of auxiliary oil pump 503, and one-way valve is installed at the communicated position, and the oil outlet of auxiliary oil pump 503 is communicated with temporary storage tank 505, and the bottom of temporary storage tank 505 is communicated with oil supply pipe 504, and one-way valve is also installed at the communicated position.

[0054] The methanol engine starting process, the main oil pump 502 power start, the oil supply pipe 504 for the methanol fuel pumping, methanol fuel through the main oil pump 502 oil outlet into the T pipe 501, then through the T pipe 501 dispersed to two nozzles 205, then through the two nozzle 205 synchronous injection in the cylinder 101, before the methanol engine start fuel injection, auxiliary oil pump 503 is controlled to start in advance, through the auxiliary oil pump 503, the nozzle 205, preheating oil pipe 5 and T pipe 501 in the residual methanol fuel is pre pumped into the temporary storage tank 505, the engine controller in the calculation of single fuel injection amount, will calculate the nozzle 205, preheating oil pipe 5 and T pipe 501 in the space of the residual amount of fuel, when the methanol engine continues to run, auxiliary oil pump 503 stop starting, the fuel collected in the temporary storage tank 505 is sent into the cylinder 101 under the pumping of the main oil pump 502 for use, to avoid waste.

[0055] By connecting the auxiliary oil pump 503 with the T pipe 501, the methanol engine can be started by the auxiliary oil pump 503 to remove the residual fuel in the nozzle 205, preheating oil pipe 5 and T pipe 501, avoiding the interference of the residual fuel quantity measurement on the calculation of single fuel injection amount when starting the device, which is beneficial to improve the control accuracy of the engine fuel injection amount. By connecting the temporary storage tank 505 for collecting residual fuel with the oil supply pipe 504, the residual fuel can be reused in the subsequent fuel supply process, which is beneficial to save energy. At the same time, by installing one-way valves at each port connection, the stability of residual fuel extraction and fuel supply can be ensured, avoiding the interference of fuel backflow, effectively improving the stability of the engine. The two one-way valves installed in the T pipe 501 are used to prevent the fuel pumped by the main oil pump 502 from entering the auxiliary oil pump 503 and to prevent the residual fuel from flowing back to the main oil pump 502. The one-way valve installed at the lower end of the temporary storage tank 505 is used to prevent the fuel in the oil supply pipe 504 from entering the temporary storage tank 505.

[0056] Please refer to Figure 7 and Figure 10The outer side of the oil supply pipe 504 is wrapped by a protective sleeve 6 between the main oil pump 502 and the temporary storage tank 505, and the inside of the protective sleeve 6 is provided with an electric heating wire, and a plurality of vertical metal sheets a601 are fixedly arranged on the inner end wall of the part of the oil supply pipe 504 in the protective sleeve 6, and a plurality of metal sheets b602 are fixedly arranged on the top of the top cover 4, and during the starting process of the methanol engine, the fuel in the main oil pump 502 can be preheated by the protective sleeve 6 provided with the electric heating wire wrapped outside the oil supply pipe 504, and when the methanol engine is normally started, the electric heating wire in the protective sleeve 6 can be turned off, and due to the existence of the metal sheets b602, the heat generated by the fuel combustion in the cylinder 101 can be efficiently conducted to the preheating oil pipe 5, and the entering fuel is preheated, which is beneficial to improve the temperature of the methanol fuel supplied at the initial start and improve the combustion efficiency.

[0057] By wrapping the protective sleeve 6 provided with the electric heating wire outside the oil supply pipe 504, the fuel can be preheated during the fuel injection when the device starts, the initial temperature of the fuel is improved, and the combustion efficiency is improved, and by fixing the metal sheets a601 arranged around the inside of the oil supply pipe 504, the efficiency of heat transfer from the electric heating wire to the fuel in the oil supply pipe 504 can be effectively improved, and at the same time, the metal sheets b602 are arranged to transfer the heat generated by the fuel combustion in the cylinder 101, which is beneficial to turn off the electric heating wire during the normal operation of the engine, which can realize the preheating of the fuel and save energy. EMBODIMENT

[0058] The application provides a control method of a methanol engine with an internal direct injection structure, please refer to Figure 1 - Figure 10When the engine is in the intake stroke, the engine controller calculates the amount of methanol required for a single combustion, as a unit fuel amount, the cam mechanism 3 controls the valve 203 in the intake valve 201 to move downward, so that the intake valve 201 is opened, and the synchronous piston 103 moves from top to bottom inside the cylinder 101 to perform the suction operation, when the piston 103 moves from the top dead center in the cylinder 101 to the total stroke 1 / 2, the engine controller controls the main oil pump 502 to start, and sprays 50% of the unit fuel amount of methanol into the cylinder 101 in the form of atomization through the nozzle 205, the sprayed methanol is preheated by the temperature in the engine cylinder, when the piston 103 moves from the total stroke 1 / 2 to the bottom dead center position in the cylinder 101, the engine controller controls the main oil pump 502 to spray the remaining 50% of the unit fuel amount of methanol into the cylinder 101 again in the form of atomization, forming the secondary injection mixture of methanol fuel, during the starting process of the methanol engine, the first fuel injection is performed when the piston 103 moves from the top dead center to the total stroke 1 / 2, and the second fuel injection is performed when the piston 103 moves to the bottom dead center position, the unit fuel injection is formed by the two-stage injection, the mixing effect of the two fuel injections can be enhanced by the disturbance of the intake air flow in the cylinder 101, and the uniformity and sufficiency of the fuel and air mixture are further improved, which is beneficial to improve the combustion efficiency of the fuel in the cylinder 101.

[0059] The above is only the best implementation mode adopted by the present application in combination with the current actual demand, but the protection scope of the present application is not limited thereto.

Claims

1. A methanol engine having an internal direct injection structure, comprising a cylinder block (1) and an engine controller, characterized by, The inside of the cylinder body (1) is provided with a vertically arranged cylinder (101), and the lower part of the inside of the cylinder body (1) is provided with a crankcase (102) which is communicated with the cylinder (101), the inside of the cylinder (101) is slidably provided with a piston (103), and the lower end of the piston (103) is rotatably connected with a connecting rod (104), the inside of the crankcase (102) is rotatably provided with a horizontally arranged crankshaft (105), and the lower end of the connecting rod (104) extends into the inside of the crankcase (102) and is rotatably connected with the crankshaft (105). The top of the cylinder body (1) is fixedly provided with a cylinder cover (2) which covers the top of the cylinder (101), and the inside of the cylinder cover (2) is provided with an intake valve (201) and an exhaust valve (202) which are communicated with the cylinder (101), the inside of the intake valve (201) and the exhaust valve (202) is slidably provided with a valve (203), the cylinder cover (2) is further provided with a spark plug (204) and a nozzle (205) which extend into the inside of the cylinder (101), the upper end of the valve (203) is provided with a cam mechanism (3) for controlling the up-and-down movement of the valve (203), the outside of the cylinder body (1) is fixedly provided with a main oil pump (502), and the oil outlet of the main oil pump (502) is communicated with the nozzle (205), and the oil inlet of the main oil pump (502) is communicated with an oil supply pipe (504). Further comprising a top cover (4) which is fixedly covered on the top of the cylinder cover (2), the nozzle (205) is provided with two nozzles (205), the two nozzles (205) are fixedly communicated with a preheating oil pipe (5) which is located on the top of the top cover (4), and the middle position of the preheating oil pipe (5) is communicated with a T-shaped pipe (501), the top of the top cover (4) is further fixedly provided with an auxiliary oil pump (503) which is symmetrically arranged with the main oil pump (502), and the oil outlet of the auxiliary oil pump (503) is communicated with a temporary storage tank (505). When the piston (103) moves from the top dead center in the cylinder (101) to the position of 1 / 2 of the total stroke, the engine controller controls the main oil pump (502) to start, and 50% of the unit fuel amount of methanol is sprayed into the cylinder (101) in the form of atomization through the nozzle (205), and the sprayed methanol is preheated by the temperature in the engine cylinder; When the piston (103) moves from the position of 1 / 2 of the total stroke to the bottom dead center in the cylinder (101), the engine controller controls the main oil pump (502) to spray the remaining 50% of the unit fuel amount of methanol into the cylinder (101) in the form of atomization, forming the secondary injection of methanol fuel.

2. The methanol engine with internal direct injection structure according to claim 1, characterized in that, The intake valve (201) and the exhaust valve (202) are provided with two intake valves (201) and two exhaust valves (202), respectively, which are symmetrically arranged on the left and right sides of the inside of the cylinder cover (2).

3. The methanol engine with internal direct injection according to claim 1, characterized in that, Two said nozzles (205) are respectively installed in the middle position of the symmetrically arranged two intake valves (201) and the middle position of the symmetrically arranged two exhaust valves (202), and the spark plug (204) is installed at the middle position inside the cylinder head (2) and corresponds to the top center of the cylinder (101).

4. The methanol engine with internal direct injection according to claim 1, characterized in that, The lower end of the nozzle (205) is inclined to the top center of the cylinder (101).

5. The methanol engine having the internal direct injection structure according to claim 1, characterized by The top of the piston (103) is provided with a recess corresponding to the plurality of valves (203), and the bottom of the recess is parallel to the bottom of the valve (203) in the corresponding direction.

6. The methanol engine having the internal direct injection structure according to claim 1, characterized by The top of the cylinder head (2) is provided with an intake cavity (401) connected with the two intake valves (201), and the other side of the top of the cylinder head (2) is provided with an exhaust cavity (402) connected with the two exhaust valves (202), the top of the top cover (4) is fixedly installed with an intake pipe (403) and an exhaust pipe (404), and the intake pipe (403) and the exhaust pipe (404) are respectively communicated to the inside of the intake cavity (401) and the exhaust cavity (402), the intake pipe (403) and the exhaust pipe (404) extend to the same side direction and are spirally wound.

7. The methanol engine having the internal direct injection structure according to claim 6, characterized by The outer end wall of the intake pipe (403) and the exhaust pipe (404) is fixedly provided with a plurality of heat conducting discs (405) arranged side by side.

8. The methanol engine with internal direct injection according to claim 1, characterized in that, The other two ends of the T-shaped pipe (501) are respectively communicated with the oil outlet of the main oil pump (502) and the oil inlet of the auxiliary oil pump (503), and one-way valves are installed at the communication positions, the bottom of the temporary storage tank (505) is communicated with the oil supply pipe (504), and a one-way valve is also installed at the communication position.

9. The methanol engine having the internal direct injection structure according to claim 1, characterized by, The outer side of the oil supply pipe (504) is fixedly wrapped with a protective sleeve (6) between the main oil pump (502) and the temporary storage tank (505), and an electric heating wire is installed in the protective sleeve (6), a plurality of vertically arranged metal sheets a (601) are fixedly arranged on the inner end wall of the oil supply pipe (504) in the protective sleeve (6), and a plurality of metal sheets b (602) are fixedly arranged on the outer end wall of the preheating oil pipe (5).

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