Methanol range extending power system

Abstract

The invention discloses a methanol range extending power system, which relates to the technical field of power systems, and comprises a cooling system, a single fuel methanol engine, a power battery and a control system, the single-fuel methanol engine adopts an EGR form, mixed gas in a cylinder is diluted through exhaust gas recirculation, and when the single-fuel methanol engine is in cold start, the exhaust gas in the cylinder is directly mixed with air; and the control system is used for performing graded auxiliary heating control on the single-fuel methanol engine through the power battery and the cooling system when the single-fuel methanol engine is at different starting environment temperatures. The starting problem of the methanol engine in different low-temperature environments is solved, and the energy utilization efficiency is improved.

Description

TECHNICAL FIELD

[0001] The application relates to the technical field of power systems, in particular to a methanol range-extended power system. BACKGROUND

[0002] Recently, new low-carbon and zero-carbon alternative fuels and their engine technology research and development are imminent, methanol fuel engine has obvious advantages in carbon reduction compared with traditional power, and ammonia hydrogen and other zero-carbon power technologies are not mature, and methanol fuel power is a relatively ideal transition mode for the shipping industry to reduce carbon emissions. The methanol engine can work for a long time and has good maneuverability, but the methanol fuel has large latent heat of vaporization, the single-fuel methanol engine has difficulty in cold start, and in addition, the methanol engine is prone to knock under high load. SUMMARY

[0003] The application aims to provide a methanol range-extended power system, which solves the starting problem of the methanol engine under different low-temperature environments and improves energy utilization efficiency.

[0004] To achieve the above-mentioned purpose, the application provides the following solutions.

[0005] The application provides a methanol range-extended power system, which comprises a cooling system, a single-fuel methanol engine, a power battery and a control system.

[0006] The single-fuel methanol engine adopts an EGR form and is diluted by exhaust gas recirculation to dilute the mixture in the cylinder, and when the single-fuel methanol engine is cold-started, the exhaust gas in the cylinder is directly mixed with air.

[0007] The control system is used for controlling the single-fuel methanol engine to be assisted and heated by the power battery and the cooling system when the single-fuel methanol engine is in different starting environmental temperatures.

[0008] Optionally, the methanol range-extended power system further comprises a generator, a frequency conversion power distribution device, a main propulsion motor, a gear box and a propeller which are connected in sequence.

[0009] The generator is connected with the single-fuel methanol engine.

[0010] Optionally, the methanol range-extended power system further comprises an exhaust system, the exhaust system comprises an EGR cooler, an EGR valve and a bypass valve, one end of the EGR cooler is connected with an intake manifold of the single-fuel methanol engine, the other end of the EGR cooler is connected with one end of the EGR valve, the other end of the EGR valve is connected with an exhaust pipe of the single-fuel methanol engine, and the bypass valve is connected in parallel to both ends of the EGR cooler.

[0011] A throttle valve is arranged on the intake manifold of the single-fuel methanol engine.

[0012] Optionally, the operation mode of the methanol extended-range power system includes a cold start mode and an extender start mode.

[0013] In the aspect of the step-assisted heating control of the single-fuel methanol engine by the power battery and the cooling system when the single-fuel methanol engine is at different ambient temperatures of different starts, the control system is configured to:

[0014] When the operation mode is in the cold start mode, determine whether the battery power of the power battery is greater than or equal to a power threshold to obtain a determination result.

[0015] If the determination result is yes, drive the main push motor by the power battery to drive the propeller through the gear box to work.

[0016] If the determination result is no, enter the extender start mode from the cold start mode, control the single-fuel methanol engine as a power source, and determine a temperature section of the coolant temperature of the single-fuel methanol engine, the temperature section being a first temperature stage, a second temperature stage, a third temperature stage, or a fourth temperature stage in ascending order.

[0017] If the temperature section is the first temperature stage, control the power battery to supply power to the electric heating grid of the water tank of the cooling system, the intake heating grid of the single-fuel methanol engine, and the methanol rail electric heating grid, control the bypass valve to be closed, and control the throttle valve to be enabled, monitor the coolant temperature of the single-fuel methanol engine, and when the coolant temperature of the single-fuel methanol engine is greater than or equal to a coolant threshold, determine that the cold start is successful, control the power battery to stop supplying power to the electric heating grid of the water tank of the cooling system, the intake heating grid of the single-fuel methanol engine, and the methanol rail electric heating grid, and control the bypass valve to be disconnected.

[0018] If the temperature section is the second temperature stage, control the power battery to supply power to the electric heating grid of the water tank of the cooling system, the intake heating grid of the single-fuel methanol engine, and the methanol rail electric heating grid, and control the bypass valve to be closed, monitor the coolant temperature of the single-fuel methanol engine, and when the coolant temperature of the single-fuel methanol engine is greater than or equal to a coolant threshold, determine that the cold start is successful, control the power battery to stop supplying power to the electric heating grid of the water tank of the cooling system, the intake heating grid of the single-fuel methanol engine, and the methanol rail electric heating grid, and control the bypass valve to be disconnected.

[0019] If the temperature segment is the third temperature stage, the control system controls the power battery to supply power to the intake air heater grid and the methanol rail electric heater grid of the single-fuel methanol engine, the bypass valve is closed, the coolant temperature at the single-fuel methanol engine is monitored, when the coolant temperature at the single-fuel methanol engine is greater than or equal to the coolant threshold value, it is determined that the cold start is successful, and the control system controls the power battery to stop supplying power to the intake air heater grid and the methanol rail electric heater grid of the single-fuel methanol engine, and the bypass valve is opened.

[0020] If the temperature segment is the fourth temperature stage, the control system controls the power battery to supply power to the intake air heater grid and the methanol rail electric heater grid of the single-fuel methanol engine, and the coolant temperature at the single-fuel methanol engine is monitored, when the coolant temperature at the single-fuel methanol engine is greater than or equal to the coolant threshold value, it is determined that the cold start is successful, and the control system controls the power battery to stop supplying power to the intake air heater grid and the methanol rail electric heater grid of the single-fuel methanol engine.

[0021] Optionally, the operation mode of the methanol extended-range power system further includes an extender power generation mode.

[0022] In the aspect of the control system controlling the power battery and the cooling system to perform the staged auxiliary heating of the single-fuel methanol engine when the single-fuel methanol engine is at different ambient temperatures, the control system is further configured to:

[0023] When the single-fuel methanol engine is successfully cold started from the fourth temperature stage, the control system monitors the power of the frequency conversion power distribution device, when the power of the frequency conversion power distribution device is greater than or equal to a charging threshold value, the operation mode enters the extender power generation mode, and the control system controls the frequency conversion power distribution device to charge the power battery.

[0024] Optionally, the operation mode of the methanol extended-range power system further includes an extender power generation mode, and the methanol extended-range power system is arranged on a ship.

[0025] The control system is further configured to, when the ship is in a cruising working condition, the operation mode of the methanol extended-range power system enters the extender power generation mode, the control system monitors the power of the frequency conversion power distribution device, when the power of the frequency conversion power distribution device is greater than or equal to a charging threshold value, the operation mode enters the extender power generation mode, and the control system controls the frequency conversion power distribution device to charge the power battery, and when the power of the power battery is greater than or equal to a set value, the control system controls the frequency conversion power distribution device to stop charging the power battery.

[0026] Optionally, the operation mode of the methanol extended-range power system further includes a hybrid driving mode, and the methanol extended-range power system is arranged on a ship.

[0027] The control system is also used for entering the mixed drive mode of the methanol extended range power system when the ship is in an emergency maneuvering condition, and superimposing power of the single fuel methanol engine and the power battery to drive the main propeller motor through the gear box.

[0028] Optionally, the operation mode of the methanol extended range power system further includes a pure electric mode; the methanol extended range power system is arranged on the ship.

[0029] The control system is also used for entering the pure electric mode of the methanol extended range power system when the ship is in a zero emission condition, and driving the main propeller motor through the gear box only by the power battery.

[0030] Optionally, a first switch is arranged between the power battery and the single fuel methanol engine, and the first switch is used for controlling whether the power battery supplies power to the air inlet heating grid and the methanol rail electric heating grid of the single fuel methanol engine.

[0031] A second switch is arranged between the power battery and the water tank of the cooling system.

[0032] A third switch is arranged between the power battery and the variable frequency power distribution device.

[0033] A fourth switch is arranged between the generator and the variable frequency power distribution device.

[0034] Optionally, the cooling system includes a water tank and a water pump, and the cooling liquid in the water tank is circulated and flows into the water jacket of the engine body, cylinder body and cylinder cover of the single fuel methanol engine through the water pump.

[0035] According to the specific embodiments provided in the application, the following technical effects are disclosed in the application:

[0036] The application provides a methanol extended range power system, a single fuel methanol engine adopts an exhaust gas recirculation (EGR) form, dilutes in-cylinder mixture through exhaust gas recirculation, absorbs heat released by combustion, reduces a combustion temperature peak value, thereby reducing a risk of knocking of the methanol engine under high compression ratio, improving thermal efficiency of the methanol engine and reducing NOx emission, and the power battery and the cooling system are used for controlling auxiliary heating of the single fuel methanol engine in different starting environment temperatures, solving a problem of cold starting of the methanol engine, reducing energy consumption and improving energy utilization efficiency. BRIEF DESCRIPTION OF DRAWINGS

[0037] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings needed in the embodiments. Obviously, the drawings described below only illustrate some of the embodiments of the present application, and for those skilled in the art, other drawings can also be obtained from these drawings without creative labor.

[0038] Figure 1 A structural schematic diagram of a methanol extended-range power system provided by an embodiment of the present application.

[0039] Figure 2 A control logic schematic diagram of a methanol extended-range power system provided by an embodiment of the present application. BRIEF DESCRIPTION OF DRAWINGS

[0041] 1-air filter, 2-compressor, 3-intercooler, 4-throttle valve, 5-first electric heating grid, 6-second electric heating grid, 7-third electric heating grid, 8-methanol filter, 9-methanol pump, 10-methanol fuel tank, 11-methanol rail, 12-generator, 13-methanol engine, 14-variable frequency power distribution equipment, 15-main electric motor, 16-gearbox, 17-propeller, 18-power battery, 19-water tank, 20-water pump, 21-EGR valve, 22-EGR cooler, 23-bypass valve, 24-turbine, S1-first switch, S2-second switch, S3-third switch, S4-fourth switch. DETAILED DESCRIPTION

[0042] The technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only some of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application.

[0043] In order to make the above-mentioned purposes, features and advantages of the present application more obvious and understandable, the present application will be further described in detail below with reference to the drawings and specific embodiments.

[0044] In an exemplary embodiment, the present application provides a methanol extended-range power system, as shown in the figure, which comprises a cooling system, a single-fuel methanol engine 13, a power battery 18 and a control system. Here, the power battery 18 is a power battery pack. Figure 1 The single-fuel methanol engine 13 adopts an EGR form, and the in-cylinder mixture is diluted by exhaust gas recirculation. When the single-fuel methanol engine 13 is cold started, the in-cylinder exhaust gas is directly mixed with air.

[0045] The single-fuel methanol engine 13 adopts an EGR form, and the in-cylinder mixture is diluted by exhaust gas recirculation. When the single-fuel methanol engine 13 is cold started, the in-cylinder exhaust gas is directly mixed with air.

[0046] The control system is used to control the single fuel methanol engine 13 by the power battery 18 and the cooling system when the single fuel methanol engine 13 is at different ambient temperatures of different starts.

[0047] The methanol extended range power system mainly consists of an intake system, an exhaust system, a cooling system, a methanol supply system and an electrical system, which are introduced as follows.

[0048] Intake system: Fresh air enters the compressor 2 through the air filter 1, and the pressurized air enters the intercooler 3 to be cooled by the coolant, then passes through the throttle valve 4, mixes with methanol fuel in the intake manifold, and then enters the cylinder to be ignited by the spark plug.

[0049] Exhaust system: The exhaust gas after combustion in the cylinder is mixed with fresh air through the EGR valve 21 and the EGR cooler 22, then enters the cylinder for exhaust gas recirculation, and the exhaust gas is converted into pollutants through aftertreatment, then passes through the turbine 24 for aftertreatment, and finally is discharged to the atmosphere. The use of EGR can reduce the risk of cylinder knock. During the cold start process, the bypass valve 23 of the EGR cooler 22 is opened, and the exhaust gas is directly mixed with fresh air after the EGR valve 21.

[0050] Cooling system: The coolant is pressurized by the water pump 20 and injected into the water jacket of the single fuel methanol engine 13, such as the engine body, cylinder body and cylinder head, to circulate and absorb the heat of high-temperature components such as the combustion chamber and the piston.

[0051] Methanol supply system: Methanol fuel from the methanol fuel tank 10 passes through the methanol pump 9 and the methanol filter 8, enters the methanol rail 11, and then is injected through the methanol nozzle to mix with the intake air, and then enters the cylinder to be ignited by the spark plug for combustion and work.

[0052] Electrical system: The methanol engine 13 drives the same shaft motor to generate electricity, which is transmitted to the frequency conversion power distribution equipment 14. Part of the electricity drives the main propulsion motor to work, and then drives the propeller 17 through the gear box 16 to rotate, providing power for the ship. Part of the electricity charges the power battery 18. According to the working scene, it can be divided into pure electric mode, range extender power supply mode and hybrid drive mode. The power battery 18 can provide electric energy to the electric heaters arranged in the water tank 19, the methanol rail 11 and the intake passage, and according to the sensor signals and the electric control logic, the electric heating grid heater heats the engine coolant, the intake air and the methanol fuel under different low-temperature start conditions, and the EGR cooler 22 bypasses.

[0053] The methanol extended range power system is deployed on the ship, solving the urgent needs of green and low-carbon development of the shipping industry.

[0054] The methanol extended-range power system further comprises a generator 12, a variable frequency power distribution device 14, a main push motor 15, a gear box 16 and a propeller 17 connected in sequence.

[0055] The generator 12 is connected with the single-fuel methanol engine 13.

[0056] The methanol extended-range power system further comprises an exhaust system, which comprises an EGR cooler 22, an EGR valve 21 and a bypass valve 23, one end of the EGR cooler 22 is connected with an intake manifold of the single-fuel methanol engine 13, the other end is connected with one end of the EGR valve 21, the other end of the EGR valve 21 is connected with an exhaust pipe of the single-fuel methanol engine 13, and the bypass valve 23 is connected in parallel to both ends of the EGR cooler 22.

[0057] A throttle valve 4 is arranged on an intake manifold of the single-fuel methanol engine 13.

[0058] The cooling system comprises a water tank 19 and a water pump 20, and cooling liquid in the water tank 19 is circulated and flows into water jackets of a body, a cylinder block and a cylinder head of the single-fuel methanol engine 13 through the water pump 20.

[0059] In an exemplary embodiment, a first switch S1 is arranged between the power battery 18 and the single-fuel methanol engine 13, and the first switch S1 is used to control whether the power battery 18 supplies power to an intake heater grid (a first electric heater grid 5) and a methanol rail electric heater grid (a second electric heater grid 6) of the single-fuel methanol engine 13.

[0060] A second switch S2 is arranged between the power battery 18 and the water tank 19 of the cooling system.

[0061] A third switch S3 is arranged between the power battery 18 and the variable frequency power distribution device 14.

[0062] A fourth switch S4 is arranged between the generator 12 and the variable frequency power distribution device 14.

[0063] In an exemplary embodiment, the operation modes of the methanol extended-range power system include a cold start mode and an extender start mode.

[0064] The methanol extended-range power system is deployed on a ship, and therefore the control system is a ship control system.

[0065] The control system determines the operation mode in real time based on parameters such as a ship speed sensor, an ambient temperature sensor, an engine coolant temperature sensor, a propulsion power demand and a rudder state.

[0066] The speed sensor is used to collect the sailing speed of the ship, the ambient temperature sensor is used to collect the ambient temperature, and the engine coolant temperature sensor is used to collect the coolant temperature at the single fuel methanol engine 13.

[0067] In the case that the single fuel methanol engine 13 is at different ambient temperatures at different start-ups, the single fuel methanol engine 13 is controlled to be assisted and heated in stages by the power battery 18 and the cooling system. Figure 2 The control system is used for:

[0068] When the operation mode is in the cold start mode, that is, the ship is in the cold start working condition, it is judged whether the battery capacity Q of the power battery 18 is greater than or equal to the capacity threshold Q1 (Q≥Q1), and a judgment result is obtained.

[0069] If the judgment result is yes, the main propeller motor 15 is driven by the power battery 18 to drive the propeller 17 to work through the gear box 16.

[0070] If the judgment result is no (that is, Q

[0071] If the temperature section is the first temperature stage, it indicates that the engine is in an extremely harsh temperature environment (-35℃), then the first switch S1, the second switch S2 and the bypass valve 23 of the EGR cooler 22 are all closed, the power battery 18 is controlled to supply power to the electric heating grid (the third electric heating grid 7) of the water tank 19 of the cooling system, the intake air heating grid of the single fuel methanol engine 13 and the methanol rail electric heating grid, the intake air, the coolant and the methanol fuel are heated by the electric heater, at the same time the bypass valve 23 is bypassed, the throttle valve 4 is enabled, and the intake air temperature is further heated by reducing the valve opening degree; the coolant temperature at the single fuel methanol engine 13 is monitored, and when the coolant temperature at the single fuel methanol engine 13 is greater than or equal to the coolant threshold (T≥T 冷却液阈值) is successful, and the first switch S1, the second switch S2 and the bypass valve 23 of the EGR cooler 22 are all disconnected, the control power battery 18 stops supplying power to the electric heating grid of the water tank 19 of the cooling system, the intake air heating grid of the single fuel methanol engine 13 and the methanol rail electric heating grid, the bypass valve 23 is disconnected, the electric heater stops heating, and the throttle valve 4 also stops working, that is, the throttle valve 4 also stops the intake air throttling and heating the intake air, and the exhaust gas normally passes through the EGR cooler 22 and mixes with fresh air.

[0072] If the temperature section is the second temperature stage, that is, the engine is in the general cold start condition (-10℃), the first switch S1, the second switch S2 and the bypass valve 23 of the EGR cooler 22 are all closed, the control power battery 18 supplies power to the electric heating grid of the water tank 19 of the cooling system, the intake air heating grid of the single fuel methanol engine 13 and the methanol rail electric heating grid, the cooling liquid and the methanol fuel are heated by the electric heater, the bypass valve 23 is closed, the exhaust gas of the single fuel methanol engine 13 bypasses the EGR cooler 22 and mixes with fresh air, which promotes the methanol atomization and improves the start reliability and combustion stability; the cooling liquid temperature at the single fuel methanol engine 13 is monitored, when the cooling liquid temperature at the single fuel methanol engine 13 is greater than or equal to the cooling liquid threshold value, it is determined that the cold start is successful, and the first switch S1, the second switch S2 and the bypass valve 23 of the EGR cooler 22 are all disconnected, that is, the control power battery 18 stops supplying power to the electric heating grid of the water tank 19 of the cooling system, the intake air heating grid of the single fuel methanol engine 13 and the methanol rail electric heating grid, the bypass valve 23 is disconnected, that is, the electric heater stops heating, and the exhaust gas normally passes through the EGR cooler 22 and mixes with fresh air.

[0073] If the temperature section is the third temperature stage, that is, the engine is in the normal cold start condition (0℃), the control power battery 18 supplies power to the intake air heating grid of the single fuel methanol engine 13 and the methanol rail electric heating grid, and the bypass valve 23 is closed (the first switch S1 and the bypass valve 23 of the EGR cooler 22 are closed, and the second switch S2 is disconnected), that is, the cooling liquid and the methanol fuel are heated by the electric heater, and the EGR cooler 22 is bypassed; the cooling liquid temperature at the single fuel methanol engine 13 is monitored, when the cooling liquid temperature at the single fuel methanol engine 13 is greater than or equal to the cooling liquid threshold value, it is determined that the cold start is successful, and the control power battery 18 stops supplying power to the intake air heating grid of the single fuel methanol engine 13 and the methanol rail electric heating grid (the first switch S1 is disconnected), and the bypass valve 23 is disconnected.

[0074] If the temperature stage is the fourth temperature stage, when the engine is in the cold start condition, the control system controls the power battery 18 to supply power to the intake heater grid and the methanol rail heater grid of the single fuel methanol engine 13 (the first switch S1 is closed, and the second switch S2 is opened), the cooling liquid and the methanol fuel are heated by the electric heater, and the cooling liquid temperature of the single fuel methanol engine 13 is monitored. When the cooling liquid temperature of the single fuel methanol engine 13 is greater than or equal to the cooling liquid threshold value, it is determined that the cold start is successful, and the power battery 18 stops supplying power to the intake heater grid and the methanol rail heater grid of the single fuel methanol engine 13 (the first switch S1 is opened), and the electric heater stops heating.

[0075] In an exemplary embodiment, the operation mode of the methanol extended range power system further includes an extended range generator mode.

[0076] In the aspect of the auxiliary heating control of the single fuel methanol engine 13 by the power battery 18 and the cooling system when the single fuel methanol engine 13 is in different ambient temperatures, the control system is further configured to:

[0077] When the single fuel methanol engine 13 successfully starts from the fourth temperature stage, the electric quantity Q3 of the frequency conversion power distribution device 14 is monitored. When the electric quantity of the frequency conversion power distribution device 14 is greater than or equal to the charging threshold value (Q3≥Q 充电阈值 ), the operation mode enters the extended range generator mode, and the frequency conversion power distribution device 14 is controlled to charge the power battery 18, that is, the excess electric quantity of the extended range generator is used to charge the power battery 18.

[0078] In an exemplary embodiment, the operation mode of the methanol extended range power system further includes an extended range generator mode; and the methanol extended range power system is deployed on a ship.

[0079] When the ship is in the cruising condition, the operation mode of the methanol extended range power system enters the extended range generator mode, the fourth switch S4 is kept in the closed state, the extended range generator operates in the high-efficiency region to stably generate power, and the propulsion power demand is preferentially met, the electric quantity of the frequency conversion power distribution device 14 is monitored, when the electric quantity of the frequency conversion power distribution device 14 is greater than or equal to the charging threshold value (Q3≥Q 充电阈值 ), the operation mode enters the extended range generator mode, and the frequency conversion power distribution device 14 is controlled to charge the power battery 18, and when the electric quantity of the power battery 18 is greater than or equal to the set value, the frequency conversion power distribution device 14 is controlled to stop charging the power battery 18 (the third switch S3 is opened).

[0080] In an exemplary embodiment, the operation mode of the methanol extended range power system further comprises a hybrid drive mode; and the methanol extended range power system is arranged on a ship.

[0081] The control system is further configured to, when the ship is in an emergency maneuvering condition, the operation mode of the methanol extended range power system enters the hybrid drive mode, the third switch S3 and the fourth switch S4 are both closed, the single-fuel methanol engine 13 and the power battery 18 are powered in series, the power battery 18 and the methanol extender (single-fuel methanol engine 13) are connected in parallel, the power is stacked, the main propeller motor 15 is driven to work through the gear box 16 to drive the propeller 17, the maximum power is provided, and the main propeller motor 15 is driven to work by the propeller 17 to provide the maximum power.

[0082] In an exemplary embodiment, the operation mode of the methanol extended range power system further comprises a pure electric mode; and the methanol extended range power system is arranged on a ship.

[0083] The control system is further configured to, when the ship is in a zero-emission condition (entering a port or a strict emission area), the third switch S3 is closed, the operation mode of the methanol extended range power system enters the pure electric mode, only the power battery 18 drives the main propeller motor 15 to work through the gear box 16 to drive the propeller 17, the fourth switch S4 is disconnected, and the methanol extender stops working.

[0084] The application is based on the power switching logic of the ship navigation condition, and the methanol extender and the power battery are respectively and independently worked, connected in parallel, and differently power-distributed in the cold start, cruising, and emergency maneuvering conditions of the ship, so as to improve the stability and economy of the ship in the whole navigation condition and ensure that the ship navigation meets the emission requirements.

[0085] The application solves the starting problem of the methanol engine in different low-temperature environments through multiple auxiliary heating coupling and hierarchical control, reduces energy consumption loss, uses the single methanol fuel engine only as a power generation power, makes the methanol engine work in an efficient area, thereby avoiding a knock area, solves the high-load knock problem of the methanol engine, the methanol engine adopts an EGR form, dilutes the in-cylinder mixture, absorbs the heat released by combustion, and reduces the combustion temperature peak. In addition, the system energy management and power distribution problem of the ship in multiple conditions are controlled through a logical method, and the overall energy utilization efficiency is improved.

[0086] Those skilled in the art can understand that all or part of the processes in the above-mentioned embodiment methods can be completed by instructing the relevant hardware through a computer program. The computer program can be stored in a non-volatile computer readable storage medium, and when the computer program is executed, the processes of the above-mentioned embodiments of the methods can be included. Any reference to memory, databases or other media used in the embodiments provided in the present application can include at least one of non-volatile and volatile memory. Non-volatile memory can include read-only memory (ROM), magnetic tape, floppy disk, flash memory, optical storage, high-density embedded non-volatile memory, resistive memory (ReRAM), magnetoresistive random access memory (MRAM), ferroelectric memory (FRAM), phase change memory (PCM), graphene memory, etc. Volatile memory can include random access memory (RAM) or external cache memory, etc. As an illustration but not limitation, RAM can be in various forms, such as static random access memory (SRAM) or dynamic random access memory (DRAM), etc.

[0087] The database involved in the embodiments provided in the present application can include at least one of a relational database and a non-relational database. The non-relational database can include a distributed database based on a block chain, etc., without being limited thereto. The processor involved in the embodiments provided in the present application can be a general processor, a central processing unit, a graphics processing unit, a digital signal processor, a data processing logic of programmable logic, etc., without being limited thereto.

[0088] The technical features of the above embodiments can be combined arbitrarily. To make the description concise, all possible combinations of the technical features in the above embodiments are not described, however, as long as the combinations of the technical features do not exist contradictory, they should be considered as the scope of the present application.

[0089] The principles and implementation modes of the present application are described by using specific examples in the present application. The above-mentioned embodiments are only used to help understand the method and its core idea of the present application; at the same time, for those skilled in the art, according to the idea of the present application, the specific implementation mode and application range will be changed. In conclusion, the content of the present application should not be understood as a limitation.

Claims

1. A methanol range extender power system, characterized in that, The methanol range-extending power system includes: a cooling system, a single-fuel methanol engine, a power battery, and a control system; The single-fuel methanol engine uses EGR to dilute the in-cylinder mixture through exhaust gas recirculation. When the single-fuel methanol engine is cold-started, the exhaust gas in the cylinder is directly mixed with the air. The control system is used to perform graded auxiliary heating control of the single-fuel methanol engine through the power battery and the cooling system when the single-fuel methanol engine is at different starting ambient temperatures.

2. The methanol range extender power system according to claim 1, characterized in that, The methanol range extender power system also includes a generator, frequency conversion power distribution equipment, main propulsion motor, gearbox and propeller connected in sequence; The generator is connected to the single-fuel methanol engine.

3. The methanol range extender power system according to claim 2, characterized in that, The methanol range extender power system also includes an exhaust system, which includes an EGR cooler, an EGR valve, and a bypass valve. One end of the EGR cooler is connected to the intake manifold of the single-fuel methanol engine, and the other end is connected to one end of the EGR valve. The other end of the EGR valve is connected to the exhaust pipe of the single-fuel methanol engine. The bypass valve is connected in parallel to both ends of the EGR cooler. The single-fuel methanol engine is equipped with a throttle valve on its intake manifold.

4. The methanol range extender power system according to claim 3, characterized in that, The operating modes of the methanol range extender power system include cold start mode and range extender start mode; In terms of graded auxiliary heating control of the single-fuel methanol engine through the power battery and the cooling system when the single-fuel methanol engine is at different starting ambient temperatures, the control system is used for: When the operating mode is cold start mode, it is determined whether the battery capacity of the power battery is greater than or equal to the capacity threshold, and the determination result is obtained; If the judgment result is yes, then the power battery drives the main propulsion motor to drive the propeller through the gearbox. If the judgment result is whether to enter the range extender start mode from the cold start mode, control the single-fuel methanol engine as the power source, and determine the temperature range of the coolant temperature at the single-fuel methanol engine. The temperature range is the first temperature stage, the second temperature stage, the third temperature stage, or the fourth temperature stage that increases sequentially. If the temperature range is the first temperature stage, the power battery is controlled to supply power to the electric heating grid of the water tank of the cooling system, the intake heating grid of the single-fuel methanol engine, and the methanol rail electric heating grid. At the same time, the bypass valve is controlled to close and the throttle valve is enabled. The coolant temperature at the single-fuel methanol engine is monitored. When the coolant temperature at the single-fuel methanol engine is greater than or equal to the coolant threshold, the cold start is determined to be successful. At the same time, the power battery is controlled to stop supplying power to the electric heating grid of the water tank of the cooling system, the intake heating grid of the single-fuel methanol engine, and the methanol rail electric heating grid. The bypass valve is disconnected and the throttle valve stops working. If the temperature range is the second temperature stage, the power battery is controlled to supply power to the electric heating grid of the water tank of the cooling system, the intake heating grid of the single-fuel methanol engine, and the methanol rail electric heating grid, and the bypass valve is closed; the coolant temperature at the single-fuel methanol engine is monitored, and when the coolant temperature at the single-fuel methanol engine is greater than or equal to the coolant threshold, the cold start is determined to be successful, and at the same time the power battery is controlled to stop supplying power to the electric heating grid of the water tank of the cooling system, the intake heating grid of the single-fuel methanol engine, and the methanol rail electric heating grid, and the bypass valve is disconnected; If the temperature range is the third temperature stage, the power battery is controlled to supply power to the intake heating grille and methanol rail electric heating grille of the single-fuel methanol engine, the bypass valve is closed, and the coolant temperature at the single-fuel methanol engine is monitored. When the coolant temperature at the single-fuel methanol engine is greater than or equal to the coolant threshold, the cold start is determined to be successful. At the same time, the power battery is controlled to stop supplying power to the intake heating grille and methanol rail electric heating grille of the single-fuel methanol engine, and the bypass valve is disconnected. If the temperature range is the fourth temperature stage, the power battery is controlled to supply power to the intake heating grille and methanol rail electric heating grille of the single-fuel methanol engine, and the coolant temperature at the single-fuel methanol engine is monitored. When the coolant temperature at the single-fuel methanol engine is greater than or equal to the coolant threshold, the cold start is determined to be successful, and the power battery is controlled to stop supplying power to the intake heating grille and methanol rail electric heating grille of the single-fuel methanol engine.

5. The methanol range extender power system according to claim 4, characterized in that, The operating modes of the methanol range extender power system also include the range extender power generation mode; In terms of providing graded auxiliary heating control for the single-fuel methanol engine via the power battery and the cooling system when the single-fuel methanol engine is at different starting ambient temperatures, the control system is further configured to: After the single-fuel methanol engine successfully starts from the fourth temperature stage, the power of the variable frequency power distribution equipment is monitored. When the power of the variable frequency power distribution equipment is greater than or equal to the charging threshold, the operating mode enters the range extender power generation mode, and the variable frequency power distribution equipment is controlled to charge the power battery.

6. The methanol range extender power system according to claim 2, characterized in that, The methanol range-extended power system also includes a range-extended power generation mode; the methanol range-extended power system is deployed on a ship. The control system is also used to, when the ship is in cruising condition, switch the operating mode of the methanol range extender power system to the range extender power generation mode, monitor the power of the variable frequency power distribution equipment, and when the power of the variable frequency power distribution equipment is greater than or equal to a charging threshold, switch the operating mode to the range extender power generation mode, control the variable frequency power distribution equipment to charge the power battery, and when the power of the power battery is greater than or equal to a set value, control the variable frequency power distribution equipment to stop charging the power battery.

7. The methanol range extender power system according to claim 2, characterized in that, The methanol range extender power system also includes a hybrid drive mode; the methanol range extender power system is deployed on a ship; The control system is also used to, when the ship is in an emergency maneuvering condition, switch the operating mode of the methanol range extender power system to the hybrid drive mode, combining the power of the single-fuel methanol engine and the power battery to jointly drive the main propulsion motor to drive the propeller through the gearbox.

8. The methanol range extender power system according to claim 2, characterized in that, The methanol range extender power system also includes a pure electric mode; the methanol range extender power system is deployed on a ship; The control system is also used to, when the ship is in zero-emission operation, switch the methanol range extender power system to pure electric mode, where the main propulsion motor is driven by the power battery to drive the propeller through the gearbox.

9. The methanol range extender power system according to claim 3, characterized in that, A first switch is provided between the power battery and the single-fuel methanol engine. The first switch is used to control whether the power battery supplies power to the intake heating grille and methanol rail electric heating grille of the single-fuel methanol engine. A second switch is provided between the power battery and the water tank of the cooling system; A third switch is provided between the power battery and the frequency conversion power distribution equipment; A fourth switch is provided between the generator and the frequency conversion power distribution equipment.

10. The methanol range extender power system according to claim 3, characterized in that, The cooling system includes a water tank and a water pump. The coolant in the water tank is pumped into the water jackets of the engine block, cylinder block, and cylinder head of the single-fuel methanol engine and circulates therethrough.

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