Engine waste heat utilization method based on exhaust system

Abstract

The invention relates to the field of exhaust systems, and discloses an engine waste heat utilization method based on an exhaust system, which comprises the following steps: S1, building an engine waste heat utilization system; s2, when the engine works and the environment outside the vehicle is in a low-temperature state, the management information module sends heating information to the control module; s3, after the control module receives the heating information, an electronic water pump and an air blower are started to work; and S4, the exhaust and heat exchange module conducts convection and radiation heat exchange, so that the temperature of the outer surface and the inner wall face of the heat exchange structure is increased, and cooling liquid is driven to be heated. By constructing the innovative engine waste heat utilization system and method, a large amount of heat energy which is originally lost through an exhaust system is effectively recycled. Particularly, a unique heat exchange module is adopted, heat energy in an exhaust system is transmitted to cooling liquid, warm air is finally provided for a passenger compartment through a series of heat exchange processes, the energy utilization efficiency is remarkably improved, and energy waste is reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of exhaust systems, and specifically to a method for utilizing the waste heat of an engine based on an exhaust system. Background Art

[0002] For a passenger vehicle (fuel vehicle, range extender vehicle, plug-in hybrid vehicle) equipped with an engine, when the engine is working, the mixture of fuel and air burns in the engine cylinder to push the piston to reciprocate and do work externally. The internal energy of the fuel is converted into mechanical energy to drive the vehicle, and at the same time, a large amount of heat is generated during combustion. A part of the heat is convectively exchanged through the cooling pipes in the engine cylinder, and then enters the engine compartment environment through the radiator in front of the passenger vehicle and is dissipated into the atmosphere. A small part of the heat is exchanged through the heat exchanger of the air conditioning system and is transferred to the passenger compartment and the battery pack when the passenger compartment or the battery pack needs to be heated up. The remaining heat is discharged into the atmospheric environment through the exhaust system of the engine along with the exhaust gas by convection, or is transferred to the components around the engine exhaust system by radiation.

[0003] When the air conditioning system heats the passenger compartment through the heater core for heating up, there are often pain points such as slow heating and long waiting time. Especially for vehicles with multiple rows of seats and a large seating space, the thermal comfort of the passenger compartment often cannot meet the requirements. High-end vehicles often add a rear air conditioning system on the original air conditioning system, which also brings a significant increase in cost while improving the thermal comfort of the passenger compartment. Summary of the Invention

[0004] Aiming at the deficiencies of the prior art, the present invention provides a method for utilizing the waste heat of an engine based on an exhaust system, which solves the problems of slow heating and long waiting time when the air conditioning system heats the passenger compartment through the heater core.

[0005] To achieve the above objectives, the present invention is realized through the following technical solutions: A method for utilizing the waste heat of an engine based on an exhaust system includes the following steps:

[0006] S1. Build an engine waste heat utilization system;

[0007] S2. When the engine is working and the outdoor environment is in a low-temperature state, the management information module sends a "heating" message to the control module;

[0008] S3. After receiving the "heating" message, the control module starts the electronic water pump and the blower to start working;

[0009] S4. The exhaust and heat exchange module performs convective and radiative heat exchange to increase the temperature of the outer surface and the inner wall surface of the heat exchange structure, driving the coolant to heat up;

[0010] S5. The blower conveys the external low-temperature air to the heater core, where it exchanges heat with the heated coolant, raising the air temperature and sending it into the passenger compartment to meet the thermal comfort requirements.

[0011] Preferably, the engine waste heat utilization system consists of multiple modules in a secondary manner, including a heat exchange module, a coolant circulation module, a control module, a management information module, an air delivery module, and a heat exchange module.

[0012] Preferably, step S1 includes:

[0013] S101. Construct a heat exchange module, select a heat exchange structure such as a hollow plate type, U-shaped surround, or circular ring surround, and embed it in the front muffler or rear muffler of the exhaust system;

[0014] S102. Connect the inner side of the pipes of the heat exchange module or the inner side of the plate heat exchange structure to the pipeline of the coolant circulation module;

[0015] S103. Set up a coolant circulation module, which includes an electric water pump and a water storage bottle, and connect the electric water pump and the water storage bottle to the control module to receive the regulation of the control module;

[0016] S104. Build a control module and establish a connection with the management information module to receive various information transmitted from the management information module;

[0017] S105. Connect the control module to the air delivery and heat exchange modules, so that the blower in the air delivery and heat exchange modules is controlled by the control module;

[0018] S106. Connect the heat exchange module with the air delivery and heat exchange modules, and at the same time ensure that the heater core in the air delivery and heat exchange modules is connected to the pipeline in the coolant circulation module to achieve effective heat exchange.

[0019] Preferably, the various information received from the management information module mentioned in step 104 includes heating information.

[0020] An engine waste heat utilization system based on an exhaust system, characterized in that an engine waste heat utilization system based on an exhaust system includes a heat exchange module, and a coolant circulation module is connected to the heat exchange module. The inner side of the pipes of the heat exchange module or the inner side of the plate heat exchange structure is connected to the pipeline of the coolant circulation module to ensure that the coolant flows in the heat exchange structure.

[0021] Preferably, a control module is connected to the coolant circulation module, and the electric water pump and the water storage bottle in the coolant circulation module are connected to the control module and are affected by its control effect.

[0022] Preferably, a management information module is connected to the control module, and the control module receives the information transmitted from the management information module, where the specific information content includes heating.

[0023] Preferably, an air delivery and heat exchange module is connected to the control module, and the blower in the air delivery and heat exchange module is connected to and controlled by the control module.

[0024] Preferably, the heat exchange module is connected to the air delivery and heat exchange module. At the same time, the warm air core in the air delivery and heat exchange module is connected to the pipeline in the coolant circulation module to achieve heat exchange.

[0025] The application of a method for utilizing the waste heat of an engine based on an exhaust system, such as the method for utilizing the waste heat of an engine based on an exhaust system according to any one of claims 1-4, is applied to the automotive field, especially in the new energy vehicle field and the commercial vehicle field.

[0026] The present invention provides a method for utilizing the waste heat of an engine based on an exhaust system. It has the following beneficial effects:

[0027] 1. By constructing an innovative engine waste heat utilization system and method, the present invention effectively recovers a large amount of heat energy that was originally dissipated through the exhaust system. In particular, a unique heat exchange module is adopted to transfer the heat energy in the exhaust system to the coolant, and through a series of heat exchange processes, finally warm air is provided for the passenger compartment, significantly improving the energy utilization efficiency and reducing energy waste.

[0028] 2. When the air conditioning system heats up the passenger compartment through heat exchange in the warm air core, the present invention effectively solves the problems of slow heating and long waiting time. Through an optimized heat exchange process and a precise control module, the temperature of the passenger compartment can be quickly increased, significantly shortening the waiting time for passengers in a warm environment and significantly improving the thermal comfort of the passenger compartment. Especially for vehicles with multiple rows of seats and a large seating space, it can better meet the heating needs of the people in the vehicle. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 is a flowchart of the present invention;

[0030] Figure 2 is a flowchart of S1 in the present invention;

[0031] Figure 3 is a system flowchart of the present invention;

[0032] Figure 4 is a flowchart in the working state of the present invention. DETAILED DESCRIPTION OF THE INVENTION

[0033] Next, in combination with the accompanying drawings of the present invention, the technical solutions in the embodiments of the present invention will be clearly and completely described. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0034] Embodiment 1:

[0035] Please refer to the attached Figure 1 - attached Figure 4 , the embodiment of the present invention provides a method for utilizing the waste heat of an engine based on an exhaust system, including the following steps:

[0036] S1. Build an engine waste heat utilization system, where the system consists of multiple modules in two levels, including a heat exchange module, a coolant circulation module, a control module, a management information module, an air delivery, and a heat exchange module. Each module has a specific function and role. For the detailed module functions and roles, please refer to an engine waste heat utilization system based on an exhaust system;

[0037] S101. Construct a heat exchange module, select a heat exchange structure such as a hollow plate type, a U-shaped surround, or a circular ring surround, and embed it in the front muffler and / or the rear muffler of the exhaust system to maximize the full contact between the heat exchange structure and the high-temperature exhaust gas and achieve efficient heat exchange;

[0038] S102. Connect the inner side of the pipeline of the heat exchange module or the inner side of the plate heat exchange structure to the pipeline of the coolant circulation module to ensure that the coolant can flow smoothly in the heat exchange structure, ensure that the heat can be effectively transferred from the heat exchange structure to the coolant, realize the initial transfer of heat, and the smooth flow of the coolant helps to improve the heat exchange efficiency;

[0039] S103. Set up a coolant circulation module, which includes an electronic water pump and a water storage bottle, and connect the electronic water pump and the water storage bottle to the control module to receive the regulation of the control module. The electronic water pump can provide stable power to promote the circulation of the coolant in the system, while the water storage bottle can balance the volume change of the coolant caused by temperature changes to ensure the stable operation of the system;

[0040] S104. Build a control module and establish a connection with the management information module to receive various information transmitted from the management information module. The various information includes heating information. As the "brain" of the entire system, the control module can accurately control other modules according to the received information to realize the intelligent operation of the system;

[0041] S105. Connect the control module to the air delivery and heat exchange module, so that the blower in the air delivery and heat exchange module is controlled by the control module. The control module can adjust the working state of the blower according to the actual demand to ensure the best effect of air delivery and heat exchange.

[0042] S106. Connect the heat exchange module to the air delivery and heat exchange module. At the same time, ensure that the warm air core in the air delivery and heat exchange module is connected to the pipeline in the coolant circulation module to achieve effective heat exchange, transfer the heat of the coolant heated by the heat exchange module to the air, so as to provide warm air for the passenger compartment and meet the comfort needs of passengers.

[0043] S2. When the engine is working and the outdoor environment is in a low-temperature state, the management information module sends a "heating" message to the control module, triggering the heating function of the system according to the actual environmental conditions to ensure that the vehicle interior is provided with warmth when needed.

[0044] S3. After receiving the "heating" message, the control module starts the electronic water pump and the blower to start working.

[0045] S4. The exhaust gas exchanges heat with the heat exchange module through convection and radiation, increasing the temperature of the outer surface and the inner wall surface of the heat exchange structure, driving the coolant to heat up, maximizing the recovery of waste heat in the exhaust gas, and improving the energy utilization efficiency.

[0046] S5. The blower transports the external low-temperature air to the warm air core, exchanges heat with the heated coolant, increases the air temperature and sends it into the passenger compartment to meet the thermal comfort requirements, provides a stable and comfortable temperature environment for the passenger compartment, and enhances the riding experience of passengers.

[0047] An engine waste heat utilization system based on an exhaust system, including a heat exchange module. A coolant circulation module is connected to the heat exchange module. The inner side of the pipeline or the inner side of the plate heat exchange structure of the heat exchange module is connected to the pipeline of the coolant circulation module to ensure the flow of the coolant in the heat exchange structure. A control module is connected to the coolant circulation module. The electronic water pump and the water storage bottle in the coolant circulation module are connected to the control module and are affected by its control effect. A management information module is connected to the control module. The control module receives the information transmitted from the management information module, and the specific information content includes heating. An air delivery and heat exchange module is connected to the control module. The blower in the air delivery and heat exchange module is connected to the control module and is controlled by it. The heat exchange module is connected to the air delivery and heat exchange module. At the same time, the warm air core in the air delivery and heat exchange module is connected to the pipeline in the coolant circulation module to achieve heat exchange.

[0048] Embodiment 2:

[0049] An efficiency calculation module is connected to the control module. By collecting and calculating various key parameters, it can accurately evaluate the efficiency of the engine waste heat utilization system, providing a quantitative basis for system optimization and improvement. A collection module is connected to the efficiency calculation module. The collection module includes a temperature sensor, a mass sensor, a flow sensor, a specific heat capacity measurement sensor, a rotational speed sensor, a displacement measurement sensor, a density sensor, a wind speed sensor, and a pressure sensor;

[0050] The collection module collects and extracts various parameters required by the calculation module for substitution into the formula. The specific parameters include the specific heat capacity c of the coolant, the mass m of the coolant, the temperature difference ΔT recovery of the coolant temperature rise, the mass m exhaust of the exhaust gas discharged per unit time, the specific heat capacity c exhaust of the exhaust gas, the temperature difference ΔT exhaust between the exhaust gas and the environment, the rotational speed n of the electronic water pump, the displacement V of the electronic water pump, the density ρ of the coolant, the cross-sectional area A of the air duct of the blower, the air velocity v, and the air pressure p of the blower; and transmits the extracted parameters to the efficiency calculation module;

[0051] The efficiency calculation module stores a calculation formula. The specific calculation formula is:

[0052] Efficiency of the engine waste heat utilization system:

[0053]

[0054] Where:

[0055] η: System efficiency.

[0056] Q2: The actually recovered waste heat.

[0057] Q1: Total waste heat of the engine exhaust.

[0058] The actually recovered waste heat:

[0059] Q2 = c × m × ΔT1

[0060] Where:

[0061] c: Specific heat capacity of the coolant.

[0062] m: Mass of the coolant.

[0063] ΔT1: Temperature difference of the coolant temperature rise.

[0064] Total waste heat of the engine exhaust:

[0065] Q1 = m3 × c3 × ΔT3

[0066] Where:

[0067] m3: Mass of the exhaust gas discharged per unit time.

[0068] c3: Specific heat capacity of the exhaust gas.

[0069] ΔT3: Temperature difference between the exhaust gas and the environment.

[0070] Comparative experiment:

[0071] In order to further prove the effectiveness of a method for utilizing the waste heat of an engine based on an exhaust system, a comparative experiment was conducted.

[0072] Experimental setup: Two cars of the same model and similar configurations were selected and labeled as Car A and Car B respectively. Car A used the method for utilizing the waste heat of an engine based on an exhaust system, and Car B was a common air-conditioning system, with other conditions remaining the same.

[0073] Experimental environment: The experiment was conducted in an environment with an outdoor temperature of 0°C, and the initial temperature of the passenger compartments of both cars was 5°C.

[0074] Experimental procedure: Start the engine, and at the same time, turn on the air-conditioning heating system, and record the temperature changes of the passenger compartments of both cars every 5 minutes for 30 minutes.

[0075] Experimental analysis: It can be seen from the experimental data that within the same time, the temperature rise rate of the passenger compartment of Car A equipped with the waste heat utilization system was significantly faster than that of Car B without the system. This indicates that the method for utilizing the waste heat of an engine based on an exhaust system can effectively improve the heating efficiency of the air-conditioning system, shorten the waiting time for temperature rise, and enhance the thermal comfort of the passenger compartment.

[0076] Experimental data (table):

[0077]

[0078] Although the embodiments of the present invention have been shown and described, it will be understood by those of ordinary skill in the art that various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principles and spirit of the present invention, and the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A method for utilizing engine waste heat based on an exhaust system, characterized in that: The following steps are involved: S1, build engine waste heat utilization system; S2. When the engine is running and the outside environment is at a low temperature, the management information module sends a "heating" message to the control module; S3. After receiving the "heating" information, the control module starts the electronic water pump and blower to start working; S4. The exhaust gas and the heat exchange module conduct convection and radiation heat exchange, so that the temperature of the outer surface and inner wall of the heat exchange structure increases, driving the temperature of the coolant to rise; S5. The blower delivers low-temperature external air to the heater core, where it exchanges heat with the heated coolant, raising the air temperature and delivering it into the passenger compartment to meet thermal comfort requirements.

2. The method for utilizing engine waste heat based on an exhaust system according to claim 1, characterized in that: The engine waste heat utilization system is composed of multiple modules, including a heat exchange module, a coolant circulation module, a control module, a management information module, an air delivery module, and a heat exchange module.

3. The method for utilizing engine waste heat based on an exhaust system according to claim 1, characterized in that: Step S1 includes: S101. Construct a heat exchange module, select a hollow plate, U-shaped surround or ring surround heat exchange structure, and embed it into the front muffler or rear muffler of the exhaust system; S102. Connecting the inner side of the pipe of the heat exchange module or the inner side of the plate heat exchange structure to the pipe of the coolant circulation module; S103. Setting a coolant circulation module, including an electronic water pump and a water storage bottle, and connecting the electronic water pump and the water storage bottle to the control module to accept the control of the control module; S104. Build a control module and establish a connection with the management information module to receive various information transmitted from the management information module; S105. Connecting the control module to the air delivery and heat exchange module so that the blower in the air delivery and heat exchange module is controlled by the control module; S106. Connect the heat exchange module with the air delivery and heat exchange modules, and ensure that the warm air core in the air delivery and heat exchange modules is connected with the pipeline in the coolant circulation module to achieve effective heat exchange.

4. The method for utilizing engine waste heat based on an exhaust system according to claim 3, characterized in that: The various information mentioned in step 104 is received from the management information module, and the various information includes heating information.

5. An engine waste heat utilization system based on an exhaust system according to any one of claims 1 to 8, characterized in that: An engine waste heat utilization system based on an exhaust system includes a heat exchange module, to which a coolant circulation module is connected. The inner side of a pipeline of the heat exchange module or the inner side of a plate heat exchange structure is connected to the pipeline of the coolant circulation module to ensure that the coolant flows in the heat exchange structure.

6. The engine waste heat utilization system based on the exhaust system according to claim 5, characterized in that: The coolant circulation module is connected to a control module, and the electronic water pump and the water storage bottle in the coolant circulation module are connected to the control module and are affected by the control effect thereof.

7. The engine waste heat utilization system based on the exhaust system according to claim 6, characterized in that: The control module is connected to a management information module, and the control module receives information transmitted from the management information module, wherein specific information content includes heating.

8. The engine waste heat utilization system based on the exhaust system according to claim 7, characterized in that: The control module is connected to an air delivery and heat exchange module, and the blower in the air delivery and heat exchange module is connected to the control module and is controlled by it.

9. The engine waste heat utilization system based on the exhaust system according to claim 8, characterized in that: The heat exchange module is connected to the air delivery and heat exchange module. At the same time, the warm air core in the air delivery and heat exchange module is connected to the pipeline in the coolant circulation module to achieve heat exchange.

10. An application of an engine waste heat utilization method based on an exhaust system, characterized in that: The method for utilizing engine waste heat based on an exhaust system as described in any one of claims 1 to 4 is applied in the automotive field, especially in the field of new energy vehicles and commercial vehicles.

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