Automobile engine waste heat recovery heating and refrigerating system

Abstract

The invention discloses an automobile engine waste heat recovery heating and refrigerating system, and relates to the technical field of automobile energy conservation and heat management. The waste heat recovery efficiency is high, heat loss is greatly reduced, the heat efficiency of the engine is improved, and fuel consumption is reduced; the heating temperature rise is faster in winter, the heating effect is stronger, and the vehicle using experience in the low-temperature environment is obviously improved; in summer, waste heat auxiliary refrigeration can be achieved, the load of an air conditioner compressor is reduced, and oil saving and emission reduction are further achieved; flexible high-temperature-resistant heat insulation paper is adopted, the structure is light and thin, wrapping performance is good, an engine body does not need to be changed, installation is easy and convenient, and universality is high; the external temperature of an engine compartment is reduced, thermal aging of peripheral parts is slowed down, the service life is prolonged, and the safety and reliability of the whole vehicle are improved.

Description

Technical Field

[0001] This invention relates to the field of automotive energy conservation and thermal management technology, specifically a waste heat recovery heating and cooling system for automotive engines. Background Technology

[0002] Automotive energy conservation and thermal management are core technologies for ensuring efficient vehicle operation. By optimizing thermal control, they improve energy efficiency, safety, and driving experience. Automotive thermal management is a system that comprehensively controls the heat sources and heat loads of the entire vehicle to maintain the operation of each component within its optimal temperature range, thereby ensuring safety, improving energy efficiency, and extending vehicle life.

[0003] Traditional automotive engines lose a significant amount of waste heat during operation through the engine block and exhaust system, resulting in low thermal efficiency. In winter, in-vehicle heating relies on engine coolant temperature, leading to slow heating and poor performance. In summer, the air conditioning compressor is directly driven by the engine, increasing fuel consumption and workload. Existing heat insulation and waste heat recovery devices are complex in structure, costly, and inconvenient to install, making it difficult to simultaneously achieve heat insulation, heat exchange, and vehicle compatibility. Therefore, this invention provides a waste heat recovery heating and cooling system for automotive engines. Summary of the Invention

[0004] To address the shortcomings of existing technologies, this invention provides a waste heat recovery system for automobile engines for heating and cooling, thereby solving the aforementioned problems.

[0005] To achieve the above objectives, the present invention is implemented through the following technical solution: a waste heat recovery heating and cooling system for automobile engines, comprising: an engine block, wherein the outer wall of the engine block and its exhaust section is wrapped with a high-temperature resistant heat-insulating paper wrapping layer, and a heat exchange pipeline is installed between the high-temperature resistant heat-insulating paper wrapping layer and the engine block;

[0006] It also includes: a circulation control unit and a heating / cooling switching device, wherein the circulation control unit is connected to both ends of the heat exchange pipeline, and is used to monitor the temperature and pressure parameters of the heat exchange medium in real time, and automatically adjust the circulation flow and direction of the medium according to the preset in-vehicle temperature threshold; the heating / cooling switching device is electrically connected to the circulation control unit.

[0007] Preferably, the high-temperature resistant heat-insulating paper wrapping layer is configured from the inside out as an inner heat-insulating paper, an outer heat-insulating paper, and an outer protective layer.

[0008] Preferably, both the inner and outer heat insulation paper are made of flexible ceramic fiber paper or aerogel composite heat insulation paper with a temperature resistance of ≥1000℃, and the thickness of the inner and outer heat insulation paper is 1-3mm. The outer protective layer is made of aluminum foil fiberglass cloth with a thickness of 0.3-0.5mm.

[0009] Preferably, the heat exchange pipeline is in close contact with the surface of the engine cylinder block, and is made of Φ6-Φ8mm copper pipe or high-temperature resistant flexible hose, arranged in a serpentine manner.

[0010] Preferably, the circulation control unit includes a temperature sensor, a pressure sensor, a central controller, and a power module.

[0011] Preferably, the temperature sensor is a PT1000 platinum resistance sensor, installed at the inlet and outlet ends of the heat exchange pipeline to collect medium temperature data in real time; the pressure sensor is a diffused silicon pressure sensor used to monitor the medium pressure in the pipeline; the central controller is based on an STM32F4 series microprocessor, integrating data acquisition, logic operation and control output functions, and can be set according to a preset vehicle interior temperature threshold; the power module adopts a DC / DC conversion circuit with an input voltage range of 12V-24V, providing stable power supply to the components in the circulation control unit.

[0012] Preferably, the circulation control unit is also equipped with a CAN communication interface to achieve real-time data interaction with the heating / cooling switching device.

[0013] Preferably, the heating / cooling switching device is based on a 12V circulating water pump and a temperature control valve to achieve flow regulation and automatic / manual switching between winter and summer modes.

[0014] Beneficial effects

[0015] Compared with the prior art, the present invention has the following advantages:

[0016] High waste heat recovery efficiency significantly reduces heat loss, improves engine thermal efficiency, and reduces fuel consumption; faster heating in winter and stronger heating effect, significantly improving the driving experience in low-temperature environments; waste heat can assist in cooling in summer, reducing the load on the air conditioning compressor and further achieving fuel saving and emission reduction; using flexible high-temperature resistant heat insulation paper, the structure is thin and lightweight with good wrapping properties, requiring no modification to the engine body, making installation simple and highly versatile; reducing the external temperature of the engine compartment, slowing down the thermal aging of surrounding components, extending service life, and improving the safety and reliability of the entire vehicle. Attached Figure Description

[0017] Figure 1 This is a three-dimensional structural schematic diagram of the present invention;

[0018] Figure 2 This is a front sectional view of the present invention;

[0019] Figure 3 This is a block diagram of the circulation control unit and the heating / cooling switching device in this invention.

[0020] In the diagram: 1. Engine block; 2. High-temperature resistant heat insulation paper wrapping layer; 21. Inner heat insulation paper; 22. Outer heat insulation paper; 23. Outer protective layer; 3. Heat exchange pipeline; 4. Circulation control unit; 41. Temperature sensor; 42. Pressure sensor; 43. Central controller; 44. Power module; 5. Heating / cooling switching device. Detailed Implementation

[0021] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0022] Please see Figure 1-3 A waste heat recovery heating and cooling system for automobile engines includes: an engine block 1, the outer walls of the engine block 1 and its exhaust section are wrapped with a high-temperature resistant heat-insulating paper wrapping layer 2, and a heat exchange pipeline 3 is installed between the high-temperature resistant heat-insulating paper wrapping layer 2 and the engine block 1.

[0023] It also includes: a circulation control unit 4 and a heating / cooling switching device 5, wherein the circulation control unit 4 is connected to both ends of the heat exchange pipeline 3, and is used to monitor the temperature and pressure parameters of the heat exchange medium in real time, and automatically adjust the circulation flow and direction of the medium according to the preset in-vehicle temperature threshold; the heating / cooling switching device 5 is electrically connected to the circulation control unit 4.

[0024] Specifically, the high-temperature resistant heat-insulating paper wrapping layer 2 is configured from the inside out as an inner heat-insulating paper 21, an outer heat-insulating paper 22, and an outer protective layer 23. By setting the inner heat-insulating paper 21, it can closely fit the outer wall of the engine block 1 and the exhaust section, minimizing the direct loss of heat to the outside, and creating favorable heat retention conditions for the heat exchange pipeline 3 to efficiently absorb the engine's waste heat. The setting of the outer heat-insulating paper 22 further enhances the overall heat insulation effect, forming a double heat insulation barrier with the inner layer, further reducing heat loss. The outer protective layer 23 can effectively resist the damage to the heat insulation layer caused by dust, water vapor and mechanical friction in the external environment, and extend the service life of the entire wrapping layer.

[0025] Specifically, both the inner heat insulation paper 21 and the outer heat insulation paper 22 are made of flexible ceramic fiber paper or aerogel composite heat insulation paper with a temperature resistance of ≥1000℃. The thickness of both the inner and outer heat insulation papers is 1–3 mm. Both flexible ceramic fiber paper and aerogel composite heat insulation paper possess excellent high-temperature resistance, capable of withstanding the high temperatures generated during engine operation. They are not prone to aging or deformation over long-term use, effectively maintaining the structural integrity of the heat insulation layer and ensuring the stable operation of the waste heat recovery system. The thickness of 1–3 mm ensures excellent heat insulation while avoiding excessive space occupation in the engine compartment due to excessive thickness. It also considers the conformability of the flexible material, allowing it to tightly wrap the complex curved surfaces of the engine block 1 and the exhaust section, reducing the air gap between the heat insulation layer and the cylinder block. Improving heat retention efficiency lays the foundation for efficient waste heat collection in subsequent heat exchange pipelines. In addition, this thickness range facilitates installation and maintenance, avoiding increased construction difficulty due to excessive thickness or insufficient insulation performance due to insufficient thickness, thus achieving a good balance between practicality and performance. The outer protective layer 23 is made of aluminum foil fiberglass cloth. Aluminum foil fiberglass cloth has good high-temperature resistance and can withstand the long-term high-temperature environment in the engine compartment without deformation or aging. The aluminum foil material has excellent waterproof and moisture-proof properties, which can block the intrusion of external moisture and dust, preventing the inner insulation paper from reducing its insulation performance or becoming moldy due to moisture. The thickness of 0.3 to 0.5 mm can ensure sufficient mechanical strength to resist external mechanical friction and minor impacts, while avoiding increasing the overall weight of the wrapping layer and occupying too much engine compartment space due to excessive thickness.

[0026] Specifically, the heat exchange pipeline 3 is closely attached to the surface of the engine block 1, using Φ6-Φ8mm copper pipes or high-temperature resistant hoses. Copper pipes or high-temperature resistant hoses have excellent thermal conductivity, which can quickly transfer the waste heat of the engine block 1 and exhaust section to the internal circulating medium, improving the waste heat recovery efficiency. At the same time, they have good high temperature resistance and corrosion resistance, which can adapt to the high temperature environment during engine operation and the long-term scouring of the heat exchange medium, ensuring that the pipeline is not prone to leakage or damage. The Φ6-Φ8mm setting can ensure sufficient circulation flow of the heat exchange medium while avoiding the tightness of pipeline layout space in the engine compartment due to excessive pipe diameter. At the same time, the appropriate pipe diameter can effectively reduce the flow resistance of the medium, reduce the operating energy consumption of the circulation control unit, and ensure the high efficiency and energy saving of the waste heat recovery process. The heat exchange pipeline 3 is arranged in a serpentine manner, evenly distributed between the high-temperature resistant heat insulation paper wrapping layer 2 and the engine block 1, which can fully contact the engine surface, quickly absorb waste heat, and transfer heat to the internal circulating heat exchange medium.

[0027] Specifically, the circulation control unit 4 includes a temperature sensor 41, a pressure sensor 42, a central controller 43, and a power module 44.

[0028] Specifically, temperature sensor 41 is a PT1000 platinum resistance sensor with a range of -40℃ to 200℃, installed at the inlet and outlet ends of heat exchange pipeline 3 to collect medium temperature data in real time; pressure sensor 42 is a diffused silicon pressure sensor with a range of 0 to 2MPa, used to monitor the medium pressure in the pipeline; central controller 43 is based on an STM32F4 series microprocessor, integrating data acquisition, logic operation and control output functions, and can be set according to preset in-vehicle temperature thresholds (e.g., 22℃±2℃ in heating mode and 26℃±2℃ in cooling mode); power module 44 uses a DC / DC conversion circuit with an input voltage range of 12V-24V to provide stable power to the components in the circulation control unit 4.

[0029] Specifically, the circulation control unit 4 is also equipped with a CAN communication interface to achieve real-time data interaction with the heating / cooling switching device 5, ensuring the synchronization of mode switching.

[0030] Specifically, the heating / cooling switching device 5 uses a 12V circulating water pump and a thermostatic valve to achieve flow regulation and automatic / manual switching between winter and summer modes; thus, it can flexibly switch the working mode according to the actual temperature requirements inside the vehicle: in the winter heating scenario, the thermostatic valve opens the heating circuit channel, the 12V circulating water pump starts and drives the heat exchange medium (such as antifreeze) to flow through the heat exchange pipeline according to the set flow rate, efficiently absorbing the waste heat from the engine block and exhaust section, and then transferring the heat to the vehicle's heating heat exchanger, which blows warm air through the blower to raise the temperature inside the vehicle; when the temperature sensor 41 detects that the temperature inside the vehicle has reached the upper limit of the preset heating threshold, The central controller 43 uses CAN communication commands to reduce the opening of the temperature control valve or decrease the speed of the water pump, thereby reducing the medium circulation flow and maintaining a stable interior temperature within a comfortable range. In summer cooling scenarios, the switching device receives the cooling mode signal from the circulation control unit 4, and the temperature control valve switches to the cooling auxiliary circuit. The heat exchange medium transfers the absorbed engine waste heat to the heat dissipation module of the vehicle's air conditioning system, helping to reduce the heat dissipation load of the air conditioning compressor, thereby reducing compressor operating energy consumption and improving cooling efficiency. If the interior temperature is lower than the lower limit of the cooling threshold, the device automatically adjusts the circulation flow or stops the water pump to avoid over-cooling. In manual mode, users can directly select heating or cooling via the mode switching button on the vehicle's central control panel. The device responds instantly to commands, prioritizing manual operation to meet personalized temperature adjustment needs.

[0031] Working principle:

[0032] When the car engine starts, the engine block 1 and exhaust section quickly generate a large amount of waste heat. The high-temperature heat-resistant insulation paper wrapping layer 2 retains the heat on the engine surface through the double heat insulation barrier of the inner layer 21 and the outer layer 22, creating an efficient heat absorption environment for the heat exchange pipeline 3.

[0033] The heat exchange medium (such as antifreeze) in the heat exchange pipeline 3 begins to circulate under the control of the circulation control unit 4: the temperature sensor 41 collects the temperature of the medium at the inlet and outlet of the pipeline in real time, the pressure sensor 42 monitors the pipeline pressure, and the data is transmitted to the central controller 43. The central controller 43 combines the preset in-vehicle temperature threshold (heating 22℃±2℃, cooling 26℃±2℃) and the in-vehicle temperature feedback received by the CAN communication interface to determine the current demand mode and send a command to the heating / cooling switching device 5.

[0034] During winter heating, the thermostatic valve of switching device 5 opens the heating circuit. The 12V circulating water pump drives the medium to flow through heat exchange pipe 3 to absorb waste heat, which is then transferred to the vehicle's interior heater heat exchanger. The blower then blows warm air to raise the interior temperature. When the interior temperature reaches the upper limit of the heating threshold, the central controller 43 instructs the thermostatic valve to reduce its opening or the water pump to slow down, maintaining a stable temperature. During summer cooling, the thermostatic valve switches to the cooling auxiliary circuit. The medium transfers waste heat to the vehicle's air conditioning cooling module, helping to reduce the compressor's heat dissipation load and reduce energy consumption. If the interior temperature is below the lower limit of the cooling threshold, the device automatically adjusts the flow rate or stops the water pump. In manual mode, the user can directly select the mode via the switch button on the central control panel, and the device prioritizes manual commands. The entire system significantly reduces vehicle energy consumption and improves energy efficiency and interior comfort by replacing or assisting traditional heating and cooling methods through waste heat recovery.

[0035] Furthermore, any content not described in detail in this specification is existing technology known to those skilled in the art.

[0036] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0037] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A waste heat recovery heating and cooling system for automobile engines, comprising: The engine cylinder block (1) is characterized in that the outer wall of the engine cylinder block (1) and its exhaust section is wrapped with a high-temperature heat-insulating paper wrapping layer (2), and a heat exchange pipeline (3) is installed between the high-temperature heat-insulating paper wrapping layer (2) and the engine cylinder block (1). It also includes: a circulation control unit (4) and a heating / cooling switching device (5), wherein the circulation control unit (4) is connected to both ends of the heat exchange pipeline (3) and is used to monitor the temperature and pressure parameters of the heat exchange medium in real time, and automatically adjust the circulation flow and direction of the medium according to the preset in-vehicle temperature threshold; the heating / cooling switching device (5) is electrically connected to the circulation control unit (4).

2. The automotive engine waste heat recovery heating and cooling system according to claim 1, characterized in that, The high-temperature resistant heat insulation paper wrapping layer (2) is configured as an inner heat insulation paper (21), an outer heat insulation paper (22) and an outer protective layer (23) from the inside to the outside.

3. The automotive engine waste heat recovery heating and cooling system according to claim 2, characterized in that, The inner heat insulation paper (21) and the outer heat insulation paper (22) are both made of flexible ceramic fiber paper or aerogel composite heat insulation paper with a temperature resistance of ≥1000℃. The thickness of the inner heat insulation paper (21) and the outer heat insulation paper (22) is 1 to 3 mm. The outer protective layer (23) is made of aluminum foil fiberglass cloth with a thickness of 0.3 to 0.5 mm.

4. The automotive engine waste heat recovery heating and cooling system according to claim 1, characterized in that, The heat exchange pipeline (3) is closely attached to the surface of the engine cylinder block (1), and is made of Φ6-Φ8mm copper pipe or high-temperature resistant flexible hose, arranged in a serpentine manner.

5. A waste heat recovery heating and cooling system for an automobile engine according to claim 1, characterized in that, The circulation control unit (4) includes a temperature sensor (41), a pressure sensor (42), a central controller (43), and a power module (44).

6. A waste heat recovery heating and cooling system for an automobile engine according to claim 5, characterized in that, The temperature sensor (41) is a PT1000 platinum resistance sensor, installed at the inlet and outlet of the heat exchange pipeline (3) to collect medium temperature data in real time; the pressure sensor (42) is a diffused silicon pressure sensor used to monitor the medium pressure in the pipeline; the central controller (43) is based on an STM32F4 series microprocessor, integrating data acquisition, logic operation and control output functions, and can be set according to the preset in-vehicle temperature threshold; the power module (44) adopts a DC / DC conversion circuit with an input voltage range of 12V-24V, providing stable power supply for each component in the circulation control unit (4).

7. A waste heat recovery heating and cooling system for an automobile engine according to claim 5, characterized in that, The cycle control unit (4) is also equipped with a CAN communication interface to achieve real-time data interaction with the heating / cooling switching device (5).

8. The automotive engine waste heat recovery heating and cooling system according to claim 1, characterized in that, The heating / cooling switching device (5) is based on a 12V circulating water pump and a temperature control valve to achieve flow regulation and automatic / manual switching between winter and summer modes.

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