Preheating, heat dissipation and heat storage free piston internal combustion engine generator heat management system

Abstract

The invention relates to the technical field of thermal management of generators, in particular to a thermal management system of a free piston internal combustion engine generator with preheating, heat dissipation and heat storage functions. Comprising an engine, a temperature sensor is fixed to the engine, the top of the temperature sensor is connected with a whole vehicle ECU, one end of the whole vehicle ECU is connected with a controller, the top of one end of the engine is connected with a one-way control valve through a pipeline, and the bottom of the one-way control valve is connected with a water tank radiator through a pipeline; the bottom of the water tank radiator is connected with an engine water pump through a pipeline. According to the free piston internal combustion generator thermal management system with the preheating, heat dissipation and heat storage functions, cooling liquid flowing through a copper straight-through inner pipe is heated through PTC heating ceramic, the heated cooling liquid flows to an engine water jacket through an engine cooling system minor cycle to preheat an engine cylinder body, and the problems that an engine is hard to start normally due to overcooling, and the service life of the engine is prolonged are solved. Damage of cold start to the engine is greatly reduced, and normal and efficient operation of the engine is guaranteed.

Description

Technical Field

[0001] The present invention relates to the technical field of thermal management of generators, and in particular to a thermal management system for a free piston internal combustion generator capable of preheating, dissipating heat and storing heat. Background Art

[0002] Free-Piston Linear Generator (FPLG) is a new type of energy conversion device that combines an internal combustion engine and a linear motor. It mainly consists of two parts: a free-piston internal combustion engine and a linear motor.

[0003] The existing free piston internal combustion generator has a simple coupling system structure, and the internal combustion engine can operate at a larger compression ratio, with the advantages of high mechanical efficiency and low emissions. The free piston internal combustion generator does not require an external energy source during operation, but it needs to be preheated before starting. In winter in my country, especially in the northern region, the temperature is relatively low. After being parked outdoors overnight, the engine often becomes too cold and cannot start normally. Due to the low internal temperature of the engine, the fluidity of the fuel will deteriorate, which will greatly reduce the atomization effect of the fuel. Although some are equipped with a series of cold start devices, frequent cold starts will cause incomplete evaporation of the fuel to form carbon deposits, and will also increase engine wear and shorten its service life.

[0004] The existing free-piston internal combustion generator cooling system performs well in normal temperature environments and low-load conditions, but the cooling performance will be greatly reduced in high-temperature environments and high-load conditions. At the same time, the cooling mode can only be changed by adjusting the size of the coolant circulation. When driving in hot and harsh environments, the engine is prone to overheating, and even deflagration may occur in extreme cases. In addition, components such as the combustion chamber, piston and linear generator may face higher heat loads, and effective heat dissipation measures need to be taken.

[0005] Existing fuel vehicle engines generally have the problem of waste heat, but when starting the engine the next day, extra electricity and fuel have to be consumed to preheat the engine to ensure normal and efficient operation of the engine. This not only brings additional expenses, but the extra consumption of preheating the engine also causes further pollution to the environment, which is extremely unfriendly to both economy and the environment.

[0006] To this end, a free piston internal combustion generator thermal management system with preheating, heat dissipation and heat storage is designed to provide another technical solution to the above technical problems. Summary of the invention

[0007] Based on this, it is necessary to provide a free piston internal combustion generator thermal management system for preheating, heat dissipation and heat storage to solve the technical problems raised in the above background technology.

[0008] In order to solve the above technical problems, the present invention adopts the following technical solutions:

[0009] A preheating, heat dissipation and heat storage free piston internal combustion generator thermal management system comprises an engine, a temperature sensor is fixed on the engine, a one-way control valve is connected to the top of one end of the engine through a pipeline, a water tank radiator is connected to the bottom of the one-way control valve through a pipeline, an engine water pump is connected to the engine through a pipeline at the bottom of the water tank radiator, the engine water pump is connected to the engine, a cooling fan is connected to one end of the water tank radiator, a first control valve is connected between the engine and the one-way control valve through a pipeline, an electric control water pump is connected to the bottom of the first control valve, one end of the electric control water pump is connected to a first three-way valve, one end of the first three-way valve is connected to a PTC heater, a second control valve is connected to the bottom of the PTC heater, the second control valve is connected to the pipeline between the engine water pump and the water tank radiator, the bottom of the first three-way valve is connected to a heat accumulator, the bottom of the heat accumulator is connected to the pipeline between the PTC heater and the second control valve, a check valve is connected between the first control valve and the electric control water pump through a pipeline, and the bottom of the check valve is connected to the pipeline between the second control valve and the engine water pump.

[0010] As a preferred implementation of the preheating, heat dissipation and heat storage free piston internal combustion generator thermal management system provided by the present invention, the top of the temperature sensor is connected to the vehicle ECU, and one end of the vehicle ECU is connected to a controller.

[0011] As a preferred implementation of the preheating, heat dissipation and heat storage free-piston internal combustion generator thermal management system provided by the present invention, the controller and the cooling fan, the controller and the engine water pump, the controller and the first control valve, the controller and the second control valve, the controller and the electronically controlled water pump, and the controller and the one-way control valve are all electrically connected through wires.

[0012] As a preferred embodiment of the preheating, heat dissipation and heat storage free piston internal combustion generator thermal management system provided by the present invention, the PTC heater includes a copper tube, a PTC heating ceramic, an aluminum shell, a polyurethane thermal insulation material and a first stainless steel shell, a copper tube is fixed to the inner side of the first stainless steel shell, one end of the copper tube is connected to the first three-way valve, a PTC heating ceramic is fixed to the outside of the copper tube and located on the inner side of the first stainless steel shell, an aluminum shell is fixed to the outside of the PTC heating ceramic, a polyurethane thermal insulation material is fixed to the outside of the aluminum shell, and the polyurethane thermal insulation material is located on the inner side of the first stainless steel shell.

[0013] As a preferred implementation of the preheating, heat dissipation and heat storage free piston internal combustion generator thermal management system provided by the present invention, coolant is provided inside the copper tube.

[0014] As a preferred embodiment of the preheating, heat dissipation and heat storage free piston internal combustion generator thermal management system provided by the present invention, one end of the PTC heating ceramic is connected to a wire, and one end of the wire passes through the aluminum shell and the polyurethane insulation material and extends out of the first stainless steel shell.

[0015] As a preferred embodiment of the preheating, heat dissipation and heat storage free piston internal combustion generator thermal management system provided by the present invention, the heat accumulator includes a heat accumulator water inlet, a bracket, a second stainless steel shell, a heat accumulator water outlet, a thermal insulation layer and a plate-shaped heat storage block, a heat accumulator water inlet is opened inside one end of the second stainless steel shell, the heat accumulator water inlet is connected to the first three-way valve, a heat accumulator water outlet is opened inside the other end of the second stainless steel shell, a bracket is fixed inside the second stainless steel shell, a plate-shaped heat storage block is fixed on the inner side of the bracket, and a thermal insulation layer is fixed on the outer side of the plate-shaped heat storage block.

[0016] It can be seen without a doubt that the above-mentioned technical solution of the present application can definitely solve the technical problem to be solved by the present application.

[0017] At the same time, through the above technical solutions, the present invention has at least the following beneficial effects:

[0018] The present invention provides a preheating, heat dissipation and heat storage free piston internal combustion generator thermal management system, which heats the coolant flowing through the copper straight-through inner tube by using PTC heating ceramics. The heated coolant flows to the engine water jacket through a small circulation of the engine cooling system to preheat the engine cylinder body, thereby solving the problem of the engine being difficult to start normally due to overcooling, greatly reducing the damage caused by cold starting to the engine, and ensuring the normal and efficient operation of the engine.

[0019] 2. The present invention analyzes and processes the engine cylinder temperature measured by the temperature sensor through the vehicle ECU, and then sends a signal to the controller to adjust the speed of the engine water pump and the cooling fan, so as to adjust the engine cooling mode and improve the cooling performance and driving performance under high heat environment and high load conditions.

[0020] 3. The present invention utilizes the physical properties of phase change materials that release heat when solidified and absorb heat when melted, which can effectively improve the waste of engine waste heat and the economic and environmental losses caused by preheating the engine the next day, making the vehicle more energy-saving and environmentally friendly. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0022] Figure 1 It is a schematic diagram of the structure of the vehicle cooling system of the present invention;

[0023] Figure 2 It is a schematic diagram of the structure of the PTC heater of the present invention;

[0024] Figure 3 It is a front view of the heat accumulator of the present invention;

[0025] Figure 4 is an isometric view of the heat accumulator of the present invention;

[0026] Figure 5 It is the control system logic diagram of the present invention;

[0027] Figure 6 It is the pipeline diagram of the PTC heating mode of the present invention;

[0028] Figure 7 It is the pipeline diagram of heat dissipation mode 1 and heat dissipation mode 2 of the present invention;

[0029] Figure 8 It is the pipeline diagram of heat dissipation mode three and heat storage mode one of the present invention;

[0030] Fig. 9 This is the heat storage mode 2 and the heat storage heating pipeline diagram of the present invention.

[0031] In the figure: 1. Engine; 2. PTC heater; 3. Heat accumulator; 4. Water tank radiator; 5. Cooling fan; 6. Engine water pump; 7. First three-way valve; 8. First control valve; 9. Second control valve; 10. Electronically controlled water pump; 11. Controller; 12. Vehicle ECU; 13. Check valve; 14. One-way control valve; 15. Temperature sensor; 21. Coolant; 22. Copper pipe; 23. PTC heating ceramic; 24. Aluminum shell; 25. Polyurethane insulation material; 26. First stainless steel shell; 27. Electric wire; 31. Water inlet of heat accumulator; 32. Bracket; 33. Second stainless steel shell; 34. Water outlet of heat accumulator; 35. Insulation layer; 36. Plate-shaped heat storage block. DETAILED DESCRIPTION

[0032] In order to make the purpose, technical solution and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0033] In order to enable those skilled in the art to better understand the solutions of the present invention, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings.

[0034] It should be noted that, in the absence of conflict, the embodiments of the present invention and the features and technical solutions in the embodiments may be combined with each other.

[0035] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, further definition and explanation thereof is not required in subsequent drawings.

[0036] Embodiment 1

[0037] Reference Figure 1-Figure 9 A thermal management system for a free piston internal combustion generator for preheating, heat dissipation and heat storage includes an engine 1, a temperature sensor 15 is fixed on the engine 1, so that the temperature of the engine 1 can be detected by the temperature sensor 15, the top of the temperature sensor 15 is connected to a vehicle ECU 12, one end of the vehicle ECU 12 is connected to a controller 11, so that the engine 1 can be operated by the control of the controller 11 after the vehicle ECU 12 receives the signal of the temperature sensor 15, and the top of one end of the engine 1 is connected to a one-way control valve 14 through a pipeline, so that the one-way control valve 14 can be turned on and off. The control valve 14 is connected to the coolant outlet of the engine 1, so that the one-way flow of the liquid can be controlled by the one-way control valve 14. The bottom of the one-way control valve 14 is connected to the water tank radiator 4 through a pipeline, so that the water tank radiator 4 is connected to the water outlet of the one-way control valve 14, so that the liquid in the water tank radiator 4 can flow with the engine 1 through the one-way control valve 14. The bottom of the water tank radiator 4 is connected to the engine water pump 6 through a pipeline, and the engine water pump 6 is connected to the engine 1, so that the water inside the water tank radiator 4 can be driven to flow through the operation of the engine water pump 6.

[0038] A cooling fan 5 is connected to one end of the water tank radiator 4, so that the water tank radiator 4 can be cooled by the operation of the cooling fan 5. A first control valve 8 is connected between the engine 1 and the one-way control valve 14 through a pipeline. An electric-controlled water pump 10 is connected to the bottom of the first control valve 8. One end of the electric-controlled water pump 10 is connected to a first three-way valve 7. One end of the first three-way valve 7 is connected to a PTC heater 2. The first three-way valve 7 is respectively provided with three connection ports a, b, and c. The connection a on the first three-way valve 7 is connected to the outlet of the electric-controlled water pump 10, and the connection port b on the first three-way valve 7 is connected to the inlet of the PTC heater 2. A second control valve 9 is connected to the bottom of the PTC heater 2. The second control valve 9 is connected to the pipeline between the engine water pump 6 and the water tank radiator 4, so that the second control valve 9 can be controlled to control whether the liquid in the PTC heater 2 flows into the pipeline between the engine water pump 6 and the water tank radiator 4;

[0039] The bottom of the first three-way valve 7 is connected to the heat accumulator 3, so that the c connection port on the first three-way valve 7 can be connected to the inlet of the heat accumulator 3, so that the first three-way valve 7 can realize the connection of three devices, the bottom of the heat accumulator 3 is connected to the pipeline between the PTC heater 2 and the second control valve 9, and a check valve 13 is connected between the first control valve 8 and the electric control water pump 10 through a pipeline, and the bottom of the check valve 13 is connected to the pipeline between the second control valve 9 and the engine water pump 6, so that the check valve 13 can prevent liquid from flowing back;

[0040] Preferably, the controller 11 and the cooling fan 5, the controller 11 and the engine water pump 6, the controller 11 and the first control valve 8, the controller 11 and the second control valve 9, the controller 11 and the electronically controlled water pump 10, and the controller 11 and the one-way control valve 14 are all electrically connected through wires, so that the controller 11 can control whether the cooling fan 5, the engine water pump 6, the first control valve 8, the second control valve 9, the electronically controlled water pump 10 and the one-way control valve 14 are working.

[0041] The PTC heater 2 includes a copper tube 22, a PTC heating ceramic 23, an aluminum shell 24, a polyurethane insulation material 25, a first stainless steel shell 26 and an electric wire 27. The copper tube 22 is fixed to the inner side of the first stainless steel shell 26. The interior of the copper tube 22 is provided with a coolant 21. One end of the copper tube 22 is connected to the first three-way valve 7 so that the coolant 21 can flow inside the copper tube 22. The PTC heating ceramic 23 is fixed to the outer side of the copper tube 22 and located inside the first stainless steel shell 26. The aluminum shell 24 is fixed to the outer side of the PTC heating ceramic 23. A polyurethane heat-insulating material 25 is fixed to the outside of the aluminum shell 24, and the polyurethane heat-insulating material 25 is located on the inner side of the first stainless steel shell 26, so that the PTC heating ceramic 23 can be wrapped by the aluminum shell 24, and the aluminum shell 24 can be insulated by the polyurethane heat-insulating material 25 to reduce heat loss. One end of the PTC heating ceramic 23 is connected to a wire 27, and one end of the wire 27 passes through the aluminum shell 24 and the polyurethane heat-insulating material 25 and extends out of the first stainless steel shell 26, so that the PTC heating ceramic 23 can be operated externally through the wire 27;

[0042] The heat accumulator 3 includes a heat accumulator water inlet 31, a bracket 32, a second stainless steel shell 33, a heat accumulator water outlet 34, a heat insulation layer 35 and a plate-shaped heat storage block 36. The heat accumulator water inlet 31 is opened inside one end of the second stainless steel shell 33, and the heat accumulator water inlet 31 is connected to the first three-way valve 7. The heat accumulator water outlet 34 is opened inside the other end of the second stainless steel shell 33, so that the heat accumulator water inlet 31 and the heat accumulator water outlet 34 form a flow inside the second stainless steel shell 33, and the second stainless steel shell 33 is connected to the first three-way valve 7. A bracket 32 ​​is fixed inside the shell 33, a plate-shaped heat storage block 36 is fixed on the inner side of the bracket 32, and an insulation layer 35 is fixed on the outer side of the plate-shaped heat storage block 36, so that the plate-shaped heat storage block 36 can reduce heat loss and extend the insulation time by adjusting the temperature of the insulation layer 35, so that the plate-shaped heat storage block 36 can be placed vertically inside the second stainless steel shell 33, and each surface of the plate-shaped heat storage block 36 does not contact the second stainless steel shell 33, and the overlapping plate-shaped heat storage blocks 36 are supported by the bracket 32.

[0043] In this embodiment, the composite phase change material inside the heat storage block 36 is preferably barium hydroxide octahydrate Ba(OH)2·8HO, which has a phase change temperature of 78°C and a latent heat of 263.7 kJ / kg. The materials of the phase change material packaging container and the second stainless steel shell 33 are 1 mm thick copper and stainless steel, respectively.

[0044] In this embodiment and the second embodiment, the top, bottom, one end, the other end, one side and the other side in the description of the positional relationship of the structure are all based on the present application. Figure 1-Figure 9The illustrated orientation in the figure is described, which does not indicate the necessary installation position of the structure in the actual application of the device of the present application. The position can be adjusted as needed during actual installation, but the connection relationship of the structure is correct. The specific liquid flow direction can refer to the middle 6, Figure 7 , Figure 8 and Fig. 9 The arrows in the figure indicate the direction, and the connection relationship between the inlet and outlet is explained according to the flow direction of the coolant liquid.

[0045] The use process of the preheating, heat dissipation and heat storage free piston internal combustion generator thermal management system provided by the present invention is as follows: when in use, the temperature sensor 15 installed on the engine 1 collects the temperature signal, and transmits the collected temperature signal to the vehicle ECU 12 for analysis, and the vehicle ECU 12 transmits the analyzed temperature signal to the controller 11, and the controller 11 controls the gear size of the cooling fan 5 and the engine water pump 6, so that the system can complete different heat dissipation modes;

[0046] When the temperature sensor 15 transmits the temperature signal to the vehicle ECU 12, the temperature data is first compared with the temperature T0 when the engine 1 is started. If the cylinder temperature of the engine 1 is less than T0, the PTC heater 2 enters the heating mode, the PTC heater 2 is turned on, and the coolant 21 flowing through the inside of the PTC heater 2 pipeline is heated, and then flows through the second control valve 9 and the engine water pump 6 and enters the engine 1 to preheat the cylinder of the engine 1;

[0047] When the cylinder temperature of engine 1 is preheated to exceed the starting temperature T0, the PTC heater 2 is turned off, the engine 1 is ignited, and the cooling cycle begins. The cylinder temperature of engine 1 is lower than the predetermined temperature T1, and the cooling system enters cooling mode 1, with the cooling fan 5 rotating at a low speed and the engine water pump 6 rotating at a low speed. If the cylinder temperature is higher than the predetermined temperature T1 and lower than the predetermined temperature T2, the cooling mode 2 is entered, with the cooling fan 5 rotating at a medium speed and the engine water pump 6 rotating at a medium speed. If the cylinder temperature is higher than the predetermined temperature T3, the cooling mode 3 is entered, with the cooling fan 5 rotating at a high speed and the engine water pump 6 rotating at a high speed.

[0048] Embodiment 2

[0049] Reference Figure 6-Figure 9 , based on the first embodiment, different heat dissipation modes are disclosed.

[0050] refer to Figure 6In a low temperature environment, before the engine 1 is started, the temperature sensor 15 collects the signal of the cylinder temperature of the engine 1, and after filtering, the vehicle ECU 12 determines whether the cylinder temperature is greater than the engine 1 start temperature T0. If the temperature is less than the start temperature T0, the system enters the engine 1 preheating mode, the a and b ports of the first three-way valve 7 are opened, the c port is closed, and the first control valve 8 is opened. At this time, the controller 11 controls the operation of the electronically controlled water pump 10, and the PTC heater 2 starts to work. After the coolant 21 is heated by the PTC heater 2, it flows through the second control valve 9 and the engine water pump 6 into the engine 1 water jacket and then heats the engine 1 cylinder. When the predetermined temperature is reached, the preheating is completed, the PTC heater 2 is turned off, the engine 1 is started, and the cooling cycle mode is entered.

[0051] In the preheating mode, in order to make the engine 1 reach the predetermined temperature as soon as possible to start, after the coolant 21 flows out of the coolant outlet of the engine 1, the route passes through the first control valve 8, the electronically controlled water pump 10, the a port and the b port of the first three-way valve 7, the second control valve 9, and the engine water pump 6 to enter the engine 1. At this time, the one-way control valve 14 is closed, that is, the coolant 21 does not flow through the water tank radiator 4, and the coolant 21 only flows in the cooling small circulation route to reduce heat loss. In addition, after the coolant 21 flows out of the PTC heater 2, it will pass through the check valve 13, the electronically controlled water pump 10, and the a port and the b port of the first three-way valve 7 to re-enter the PTC heater 2 for heating, thereby improving the preheating efficiency.

[0052] In this embodiment, the cooling liquid 21 flows through the pipeline diagram. Figure 6 , where the black bold line indicates the path of the coolant 21, and the shaded part of the first three-way valve 7, the first control valve 8, the second control valve 9, and the check valve 13 indicates the opening of the valve. The dotted line connecting the engine water pump 6, the first control valve 8, the second control valve 9, the electronically controlled water pump 10, the controller 11, the vehicle ECU 12, the one-way control valve 14, and the temperature sensor 15 in the figure represents the electronic control line, and the coolant 21 does not flow through this line. Figures 6 to 9 The bold, dotted, and shaded parts of Figure 5 The same is not described below.

[0053] When the engine 1 is running, there are multiple heat dissipation modes.

[0054] After the engine 1 is preheated and reaches the predetermined starting temperature, the one-way control valve 14 is opened, and the coolant 21 can flow through the water tank radiator 4 and then return to the engine 1. The cooling cycle is carried out simultaneously, and the cylinder temperature of the engine 1 is further detected and analyzed to select different heat dissipation modes. The present invention presets three different temperature gears corresponding to three different degrees of heat dissipation modes. The three heat dissipation modes achieve different degrees of heat dissipation by adjusting the speed of the cooling fan 5 and the engine water pump 6.

[0055] like Figure 7 ① The cylinder temperature of the engine 1 exceeds the starting temperature T0 but is lower than the predetermined temperature T1, and the engine 1 enters the cooling mode 1. Under the action of the controller 11, the cooling fan 5 is turned on and the fan is at a low speed, the engine water pump 6 pump speed is at a low speed, the first control valve 8 and the second control valve 9 are closed, and the coolant 21 flows through the engine water pump 6, the engine 1, the one-way control valve 14, and the water tank radiator 4 to complete the large circulation cooling system.

[0056] ② The cylinder temperature exceeds the predetermined temperature T1 and is lower than the predetermined temperature T2, and then enters mode 2. The engine water pump 6 rotates at medium speed, the cooling fan 5 rotates at medium speed, and the coolant circulation route is the same as mode 1.

[0057] ③ The cylinder temperature exceeds the predetermined temperature T2 and is lower than the predetermined temperature T3, and then enters the heat dissipation mode 3 and the heat storage mode 1, the engine water pump 6 is at high speed, and the cooling fan 5 is at high speed. In addition to the large circulation route of the coolant 21 flowing through the mode 1 and mode 2, the engine 1, the first control valve 8, the electronically controlled water pump 10, the port a and port c of the first three-way valve 7, the heat storage tank 3, the second control valve 9, and the engine water pump 6 constitute an additional cooling circulation route to enhance the heat dissipation capacity of the cooling system, and at the same time complete the utilization of the residual heat of the engine 1, forming a heat storage mode pipeline, and the heat is stored in the heat storage tank 3 for use in the heat storage heating mode.

[0058] After engine 1 is turned off, heat storage mode 2 is started.

[0059] The engine 1 has just finished running for a period of time, and the temperature of the coolant 21 is relatively high, so the heat storage mode 2 is started. Fig. 9 : At this time, the large circulation route of the cooling system is closed, the electronically controlled water pump 10 is running, and the coolant 21 flows through the first control valve 8, the electronically controlled water pump 10, the first three-way valve 7a and c ports, the heat accumulator 3, the second control valve 9, the engine water pump 6, and the engine 1 to form a heat storage route.

[0060] Depend on Figure 3 and Figure 4 In the heat storage mode, the high-temperature coolant 21 enters the heat storage tank from the heat storage tank water inlet 31 to flush the plate heat storage block 36. At this time, the temperature of the coolant 21 is higher than the phase change temperature of the composite phase change material barium hydroxide octahydrate (usually the phase change temperature of the phase change material is 78°C, and the phase change latent heat value is 263.7 kJ / kg). The composite phase change material undergoes a phase change from solid to liquid. The plate heat storage block 36 absorbs the heat and stores it. After that, the coolant 21 flows out from the heat storage tank outlet 34 and returns to the engine 1. This cycle continues until the end of the heat storage mode 2. The heat storage tank 3 adopts vacuum insulation technology, and the vacuum insulation efficiency is 94%, which improves the economy of the vehicle.

[0061] It is beneficial for the heat storage device 3 to be preheated.

[0062] When the engine 1 is turned off for a long time or before starting the next day, the heat stored in the heat accumulator 3 can be used to preheat the engine 1. Fig. 9 : When the engine 1 is cold started, the coolant 21 is in a small circulation mode, the electronically controlled water pump 10 is turned on, the first control valve 8 is turned on, and the second control valve 9 and the engine water pump 6 are turned on. When the coolant 21 flows through the heat accumulator 3, the temperature is lower than the temperature of the composite phase change material in the plate-shaped heat storage block 36. The composite phase change material undergoes a phase change from liquid to solid. The coolant 21 absorbs heat and the temperature continues to rise. After preheating is completed, the engine 1 starts and the heat dissipation mode is turned on. When the PTC heater 2 enters the preheating mode, after the coolant 21 flows out of the heat accumulator 3, it will pass through the check valve 13, the electronically controlled water pump 10, and the a and c ports of the first three-way valve 7 to re-enter the heat accumulator 3 to speed up the preheating speed.

[0063] The preferred embodiments of the present invention disclosed above are only used to help explain the present invention. The preferred embodiments do not describe all the details in detail, nor do they limit the present invention to the specific implementation methods described. Obviously, many modifications and changes can be made according to the content of this specification. This specification selects and specifically describes these embodiments in order to better explain the principles and practical applications of the present invention, so that those skilled in the art can understand and use the present invention well. The present invention is limited only by the claims and their full scope and equivalents.

Claims

1. A thermal management system for a free piston internal combustion generator with preheating, heat dissipation and heat storage, characterized in that: The invention comprises an engine (1), wherein a temperature sensor (15) is fixed on the engine (1), the top of one end of the engine (1) is connected to a one-way control valve (14) through a pipeline, the bottom of the one-way control valve (14) is connected to a water tank radiator (4) through a pipeline, the bottom of the water tank radiator (4) is connected to an engine water pump (6) through a pipeline, the engine water pump (6) is connected to the engine (1), one end of the water tank radiator (4) is connected to a cooling fan (5), a first control valve (8) is connected between the engine (1) and the one-way control valve (14) through a pipeline, the bottom of the first control valve (8) is connected to an electric control water pump (10), and the electric control water pump (10) is connected to the engine (1). One end is connected to a first three-way valve (7), one end of the first three-way valve (7) is connected to a PTC heater (2), the bottom of the PTC heater (2) is connected to a second control valve (9), the second control valve (9) is connected to a pipeline between an engine water pump (6) and a water tank radiator (4), the bottom of the first three-way valve (7) is connected to a heat accumulator (3), the bottom of the heat accumulator (3) is connected to a pipeline between the PTC heater (2) and the second control valve (9), a check valve (13) is connected between the first control valve (8) and the electric control water pump (10) via a pipeline, and the bottom of the check valve (13) is connected to a pipeline between the second control valve (9) and the engine water pump (6).

2. A preheating, heat dissipation and heat storage free piston internal combustion generator thermal management system according to claim 1, characterized in that: The top of the temperature sensor (15) is connected to a vehicle ECU (12), and one end of the vehicle ECU (12) is connected to a controller (11).

3. A preheating, heat dissipation and heat storage free piston internal combustion generator thermal management system according to claim 2, characterized in that: The controller (11) and the cooling fan (5), the controller (11) and the engine water pump (6), the controller (11) and the first control valve (8), the controller (11) and the second control valve (9), the controller (11) and the electric-controlled water pump (10), and the controller (11) and the one-way control valve (14) are all electrically connected via wires.

4. A preheating, heat dissipation and heat storage free piston internal combustion generator thermal management system according to claim 1, characterized in that: The PTC heater (2) comprises a copper tube (22), a PTC heating ceramic (23), an aluminum shell (24), a polyurethane thermal insulation material (25) and a first stainless steel shell (26); the copper tube (22) is fixed to the inner side of the first stainless steel shell (26); one end of the copper tube (22) is connected to a first three-way valve (7); the PTC heating ceramic (23) is fixed to the outer side of the copper tube (22) and located on the inner side of the first stainless steel shell (26); the aluminum shell (24) is fixed to the outer side of the PTC heating ceramic (23); the polyurethane thermal insulation material (25) is fixed to the outer side of the aluminum shell (24); the polyurethane thermal insulation material (25) is located on the inner side of the first stainless steel shell (26).

5. A preheating, heat dissipation and heat storage free piston internal combustion generator thermal management system according to claim 4, characterized in that: A cooling liquid (21) is arranged inside the copper tube (22).

6. A preheating, heat dissipation and heat storage free piston internal combustion generator thermal management system according to claim 4, characterized in that: One end of the PTC heating ceramic (23) is connected to an electric wire (27), and one end of the electric wire (27) passes through the aluminum shell (24) and the polyurethane insulation material (25) and extends out of the first stainless steel shell (26).

7. A preheating, heat dissipation and heat storage free piston internal combustion generator thermal management system according to claim 1, characterized in that: The heat accumulator (3) comprises a heat accumulator water inlet (31), a bracket (32), a second stainless steel shell (33), a heat accumulator water outlet (34), a thermal insulation layer (35) and a plate-shaped heat storage block (36); a heat accumulator water inlet (31) is provided inside one end of the second stainless steel shell (33); the heat accumulator water inlet (31) is connected to a first three-way valve (7); a heat accumulator water outlet (34) is provided inside the other end of the second stainless steel shell (33); a bracket (32) is fixed inside the second stainless steel shell (33); a plate-shaped heat storage block (36) is fixed inside the bracket (32); and a thermal insulation layer (35) is fixed outside the plate-shaped heat storage block (36).

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