Engine waste gas treatment method and system of hybrid electric vehicle and hybrid electric vehicle
By using the main controller to determine the steady-state operating conditions of the engine in the hybrid vehicle engine exhaust gas treatment system, and controlling the opening and closing of valves, the exhaust gas is treated using only the main three-way catalytic converter, which solves the problem of three-way catalytic converter aging, extends its service life and reduces costs.
Patent Information
- Application Number
- CN202511019904.3
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-07-23
- Publication Date
- 2025-11-11
AI Technical Summary
Three-way catalysts are susceptible to aging due to high temperatures in the exhaust gas treatment of hybrid vehicle engines, resulting in a short service life, inability to meet China VI b (RDE) emission standards, and higher costs.
In the engine exhaust gas treatment system of hybrid vehicles, the operating status parameters are collected by the parameter acquisition module. The main controller determines whether the engine is in a steady-state operation condition and controls the opening and closing of the first and second control valves. The exhaust gas is treated by the main three-way catalytic converter, avoiding the use of the auxiliary three-way catalytic converter.
It extends the service life of the three-way catalyst, reduces costs, and enables flexible treatment of engine exhaust gases, meeting the China VI b (RDE) emission standards.
Smart Images
Figure CN120925952A_ABST
Abstract
Description
Technical Field
[0001] This application relates to the field of vehicle exhaust emission technology, and in particular to a method, system and hybrid vehicle for treating engine exhaust gas. Background Technology
[0002] As people's environmental awareness gradually increases and calls for environmental protection grow louder, vehicle emission control, as a major source of pollution, has become a focus of attention. Various countries and regions have successively tightened emission regulations, with the China VI b (RDE) emission standard being fully implemented on July 1, 2023. Regarding the exhaust emission control of hybrid vehicle engines, the China VI b (RDE) emission standard requires not only new vehicles to meet the emission regulations regarding gaseous gases and PM / PN pollutants, but also vehicles that have traveled 200,000 kilometers.
[0003] Currently, hybrid vehicles typically utilize three-way catalytic converters to treat engine exhaust gases. These catalysts usually contain precious metals such as platinum (Pt), palladium (Pd), and rhodium (Rh), which can be used to treat harmful substances in the exhaust gases, including CO, HC, and NO. X To carry out oxidation-reduction.
[0004] However, during use, three-way catalysts are easily affected by high-temperature exhaust gases and age, resulting in a shorter service life. More three-way catalysts are needed to meet the China VI b (RDE) emission requirements, which increases costs. Summary of the Invention
[0005] This application provides a method, system, and hybrid vehicle for treating engine exhaust gas of a hybrid vehicle, which solves the problem that in the prior art, the three-way catalytic converter is easily affected by high-temperature exhaust gas during use, resulting in aging, a short service life of the three-way catalytic converter, and the need for more three-way catalytic converters to meet the China VI b (RDE) emission regulations, which leads to high costs.
[0006] In a first aspect, this application provides a method for treating engine exhaust gas in a hybrid vehicle, applied to an engine exhaust gas treatment system for a hybrid vehicle. The system includes a parameter acquisition module, a main controller, a main three-way catalytic converter, a first emission branch, a second emission branch, and an exhaust port. The first and second emission branches are connected in parallel between the main three-way catalytic converter and the exhaust port. The first emission branch includes a first control valve, and the second emission branch includes a second control valve and a secondary three-way catalytic converter. The second control valve is connected between the main three-way catalytic converter and the secondary three-way catalytic converter. The main controller is electrically connected to the parameter acquisition module, the first control valve, and the second control valve. The method provided in this application includes:
[0007] The parameter acquisition module collects operating status parameters associated with the engine of the hybrid vehicle;
[0008] The main controller determines whether the hybrid vehicle's engine is in the preset thermal steady-state operating condition based on the operating status parameters;
[0009] When the main controller determines that the engine of the hybrid vehicle is in a preset steady-state thermal operation condition, it controls the opening of the first control valve and the closing of the second control valve so that the exhaust gas generated by the engine is treated by the main three-way catalytic converter and discharged from the exhaust port through the first exhaust branch.
[0010] In some implementations, the parameter acquisition module includes at least: a temperature sensor, a throttle opening sensor, and a power acquisition module;
[0011] The operating status parameters associated with the engine of a hybrid vehicle include at least: the temperature of the coolant used to cool the engine, collected by a temperature sensor; the rate of change of the throttle opening of the hybrid vehicle, collected by a throttle opening sensor; and the operating power of the engine, collected by a power acquisition module.
[0012] In some implementations, the main controller determines whether the hybrid vehicle's engine is in a preset steady-state thermal operating condition based on operating status parameters, including:
[0013] When the coolant temperature is higher than the set temperature threshold, the rate of change of the throttle opening is less than the preset rate of change threshold, and the engine operating power is lower than the set power threshold, the main controller determines that the hybrid vehicle's engine is in a preset thermal steady-state operating condition.
[0014] In some implementations, after the main controller determines whether the hybrid vehicle's engine is in a preset steady-state thermal operating condition based on operating status parameters, the method provided in this application further includes:
[0015] When the main controller determines that the engine of the hybrid vehicle is not in the preset steady-state operating condition of the hot engine, it controls the first control valve to close and the second control valve to open, so that the exhaust gas generated by the engine is processed by the main three-way catalytic converter and the auxiliary three-way catalytic converter in sequence before being discharged from the exhaust port.
[0016] In some implementations, the parameter acquisition module includes at least: a temperature sensor, a throttle opening sensor, and a power acquisition module; the operating status parameters associated with the hybrid vehicle's engine include at least: the temperature of the coolant used to cool the engine, acquired by the temperature sensor; the rate of change of the throttle opening of the hybrid vehicle, acquired by the throttle opening sensor; and the engine's operating power, acquired by the power acquisition module. Based on the operating status parameters, the main controller determines whether the hybrid vehicle's engine is in a preset steady-state thermal operating condition, including:
[0017] The main controller determines that the engine of the hybrid vehicle is not in the preset steady-state operating condition when the coolant temperature is lower than or equal to the set temperature threshold, the rate of change of the throttle opening is greater than or equal to the preset rate of change threshold, or the engine operating power is greater than or equal to the set power threshold.
[0018] In some implementations, the set temperature threshold range is 75 degrees Celsius to 85 degrees Celsius, the preset rate of change threshold range is 3° / s to 8° / s, and the set power threshold is 25 kW to 35 kW.
[0019] Secondly, this application also provides an engine exhaust gas treatment system for a hybrid vehicle, including a parameter acquisition module, a main controller, a main three-way catalytic converter, a first emission branch, a second emission branch, and an exhaust port. The first emission branch and the second emission branch are connected in parallel between the main three-way catalytic converter and the exhaust port. The first emission branch includes a first control valve, and the second emission branch includes a second control valve and a secondary three-way catalytic converter. The second control valve is disposed between the main three-way catalytic converter and the secondary three-way catalytic converter. The main controller is electrically connected to the parameter acquisition module, the first control valve, and the second control valve, respectively. The main controller is used to execute the method executed by the main controller provided in the first aspect of this application.
[0020] In some embodiments, the system provided in this application further includes a first one-way valve and a second one-way valve. The input end of the first one-way valve is connected to the main three-way catalytic converter, the output end of the first one-way valve is connected to the first control valve, the first control valve is connected to the input end of the second one-way valve, and the output end of the first one-way valve is connected to the exhaust port.
[0021] Thirdly, this application also provides a hybrid vehicle equipped with the engine exhaust gas treatment system of the hybrid vehicle provided in the first aspect of this application.
[0022] Fourthly, this application also provides a storage medium storing a computer program, which, when executed by a main controller, causes the main controller to perform the method provided in the first aspect of this application.
[0023] Fifthly, this application also provides a computer program product, including a computer program that, when run, causes a hybrid vehicle to perform the method provided in the first aspect of this application.
[0024] This application provides a method, system, and hybrid vehicle for treating engine exhaust gas. The main controller can determine whether the hybrid vehicle's engine is in a preset steady-state operating condition based on operating status parameters. When the hybrid vehicle's engine is determined to be in the preset steady-state operating condition, it indicates that the fuel combustion is complete and the engine emits fewer harmful substances in the exhaust gas. Therefore, the first control valve is opened and the second control valve is closed, so that the exhaust gas generated by the engine is treated by the main three-way catalytic converter and discharged through the first exhaust branch. Understandably, based on the above, since the engine emits fewer harmful substances in the exhaust gas, only the main three-way catalytic converter is needed to treat the exhaust gas, which is sufficient to eliminate harmful substances and meet emission regulations. This eliminates the need for a secondary three-way catalytic converter, avoiding aging of the three-way catalyst in the secondary three-way catalytic converter, extending its service life, saving costs, and achieving "flexible" treatment of engine exhaust gas. Attached Figure Description
[0025] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.
[0026] Figure 1 One of the structural block diagrams of the engine exhaust gas treatment system for a hybrid vehicle provided in the embodiments of this application;
[0027] Figure 2 A flowchart illustrating a method for treating engine exhaust gas in a hybrid vehicle as provided in an embodiment of this application;
[0028] Figure 3 A second structural block diagram of the engine exhaust gas treatment system for a hybrid vehicle provided in an embodiment of this application;
[0029] Figure 4 This is a functional block diagram of the engine exhaust gas treatment device for a hybrid vehicle provided in an embodiment of this application. Detailed Implementation
[0030] Embodiments of the present disclosure will now be described with reference to the accompanying drawings. However, it should be understood that these descriptions are exemplary only and are not intended to limit the scope of the disclosure. Furthermore, descriptions of well-known structures and technologies are omitted in the following description to avoid unnecessarily obscuring the concepts of the present disclosure.
[0031] The accompanying drawings illustrate various structural schematics according to embodiments of the present disclosure. These drawings are not to scale, and some details have been enlarged for clarity, and some details may have been omitted. The shapes of the various regions and layers shown in the drawings, as well as their relative sizes and positional relationships, are merely exemplary and may deviate from reality due to manufacturing tolerances or technical limitations. Furthermore, those skilled in the art can design regions / layers with different shapes, sizes, and relative positions as needed.
[0032] In the context of this disclosure, when a layer / element is referred to as being "above" another layer / element, the layer / element may be directly above the other layer / element, or there may be an intermediate layer / element between them. Additionally, if a layer / element is "above" another layer / element in one orientation, then when the orientation is reversed, the layer / element may be "below" the other layer / element.
[0033] Explanation of technical terms used in this application:
[0034] Engine Steady-State Operation (TESO): In hybrid vehicles (especially range-extended hybrids or series hybrids), engine steady-state operation (TESO) refers to the engine continuously operating within a highly efficient and stable operating range, primarily for power generation or auxiliary drive, in order to achieve optimal fuel economy and emission performance.
[0035] The three-way catalytic converter (TWC) is the core component of the exhaust aftertreatment system of a gasoline engine. Its function is to convert the three main harmful pollutants in the exhaust gas—carbon monoxide (CO), hydrocarbons (HC), and nitrogen oxides (NOx)—into harmless carbon dioxide (CO2), water (H2O), and nitrogen (N2) through catalytic oxidation-reduction reactions, thereby significantly reducing exhaust emissions pollution.
[0036] The technical solutions of this application and how they solve the aforementioned technical problems will be described in detail below with specific embodiments. These specific embodiments can be combined with each other, and the same or similar concepts or processes may not be repeated in some embodiments. The embodiments of this application will now be described with reference to the accompanying drawings.
[0037] This application provides a method for treating engine exhaust gas in a hybrid vehicle, applied to an engine exhaust gas treatment system for a hybrid vehicle. In this application embodiment, the hybrid vehicle is a range-extended hybrid vehicle. Figure 1As shown, the system provided in this embodiment includes a parameter acquisition module 12, a main controller 6, a main three-way catalytic converter 1, a first emission branch 4, a second emission branch 2, and an exhaust port 11. The first emission branch 4 and the second emission branch 2 are connected in parallel between the main three-way catalytic converter 1 and the exhaust port 11. The first emission branch 4 includes a first control valve 5. The second emission branch 2 includes a second control valve 10 and a secondary three-way catalytic converter 9, with the second control valve 10 connected between the main three-way catalytic converter 1 and the secondary three-way catalytic converter 9. The main controller 6 is electrically connected to the parameter acquisition module 12, the first control valve 5, and the second control valve 10. The main controller 6 can be, but is not limited to, an Electronic Control Unit (ECU) of a hybrid vehicle. Figure 2 As shown, the method provided in this application embodiment includes:
[0038] S201: Parameter acquisition module 12 acquires operating status parameters associated with the engine of the hybrid vehicle.
[0039] For example, the parameter acquisition module 12 includes at least a temperature sensor, a throttle opening sensor, and a power acquisition module. The operating status parameters associated with the hybrid vehicle's engine include at least: the temperature of the coolant used to cool the engine, acquired by the temperature sensor; the rate of change of the throttle opening of the hybrid vehicle, acquired by the throttle opening sensor; and the engine's operating power, acquired by the power acquisition module. The power acquisition module may include a speed sensor and a torque sensor. The speed sensor acquires the engine's speed, and the torque sensor acquires the engine's torque, thereby determining the engine's power based on the engine's speed and torque.
[0040] S202: The main controller 6 determines whether the engine of the hybrid vehicle is in the preset steady-state operating condition based on the operating status parameters. If yes, then execute S203; otherwise, execute S204.
[0041] When the coolant temperature is below or equal to the set temperature threshold (80 degrees Celsius), it indicates that the engine is in a cold start state. The fuel may be at a low temperature, and some fuel does not have enough time to atomize and evaporate, resulting in higher levels of harmful substances in the engine exhaust. Similarly, if the rate of change of throttle opening is greater than or equal to a preset rate of change threshold (e.g., 5° / s), it indicates that the engine speed is rising rapidly, and some fuel does not have enough time to atomize and evaporate, thus resulting in higher levels of harmful substances in the engine exhaust. When the engine's operating power is greater than or equal to the set power threshold (e.g., 30 kW), some fuel does not have enough time to atomize and evaporate, resulting in higher levels of harmful substances in the engine exhaust.
[0042] Thus, when the coolant temperature is lower than or equal to the set temperature threshold, the rate of change of the throttle opening is greater than or equal to the preset rate of change threshold, or the engine operating power is greater than or equal to the set power threshold, the main controller 6 determines that the hybrid vehicle's engine is not in the preset steady-state operating condition.
[0043] Conversely, if the coolant temperature is higher than the set temperature threshold (80 degrees Celsius), it indicates that the engine is in a cold start state. The fuel is at a higher temperature, allowing for more complete atomization and evaporation, resulting in fewer harmful substances in the engine exhaust. Similarly, if the rate of change of throttle opening is less than a preset threshold (e.g., 5° / s), it indicates stable engine speed, allowing for more complete atomization and evaporation of the fuel, thus resulting in fewer harmful substances in the engine exhaust. When the engine's operating power is less than a set power threshold (e.g., 30 kW), the fuel also allows for more complete atomization and evaporation, resulting in fewer harmful substances in the engine exhaust.
[0044] Thus, in other embodiments, the main controller 6 determines that the engine of the hybrid vehicle is in a preset thermal steady-state operating condition when the coolant temperature is higher than a set temperature threshold (e.g., 80 degrees Celsius), the rate of change of the throttle opening is less than a preset rate of change threshold (e.g., 5° / s), and the engine operating power is lower than a set power threshold (e.g., 30 kW).
[0045] It should be noted that the set temperature threshold range is 75°C-85°C, the preset rate of change threshold range is 3° / s-8° / s, and the set power threshold is 25kW-35kW. For example, the set temperature threshold can be 75°C, 80°C, or 85°C; the preset rate of change threshold can be 3° / s, 5° / s, or 8° / s; and the set power threshold can be 25kW, 30kW, or 35kW.
[0046] S203: The main controller 6 controls the opening of the first control valve 5 and the closing of the second control valve 10 so that the exhaust gas generated by the engine is treated by the main three-way catalytic converter 1 and discharged from the exhaust port 11 through the first exhaust branch 4.
[0047] Exemplarily, the system provided in this application embodiment further includes an emission pipeline control module 7. The emission pipeline control module 7 may be, but is not limited to, a microprocessor, and the main controller 6 is electrically connected to the microprocessor. The main controller 6 can notify the emission pipeline control module 7 to control the first control valve 5 to open and the second control valve 10 to close. After receiving the notification from the main controller 6, the emission pipeline control module 7 controls the first control valve 5 to open and the second control valve 10 to close. Still as... Figure 1 As shown, the first control valve 5 is in the open state and the second control valve 10 is in the closed state.
[0048] S204: The main controller 6 controls the first control valve 5 to close and the second control valve 10 to open, so that the exhaust gas generated by the engine is processed by the main three-way catalytic converter 1 and the auxiliary three-way catalytic converter 9 in sequence and then discharged from the exhaust port 11.
[0049] The main controller 6 can instruct the emission pipeline control module 7 to close the first control valve 5 and open the second control valve 10. Upon receiving the notification from the main controller 6, the emission pipeline control module 7 controls the first control valve 5 to close and the second control valve 10 to open. Figure 3 As shown, the first control valve 5 is in the closed state and the second control valve 10 is in the open state.
[0050] In addition, as before Figure 1 and Figure 3 As shown, the system provided in this embodiment further includes a first one-way valve 3 and a second one-way valve 84. The input end of the first one-way valve 3 is connected to the main three-way catalytic converter 1, the output end of the first one-way valve 3 is connected to the first control valve 5, the first control valve 5 is connected to the input end of the second one-way valve 84, and the output end of the first one-way valve 3 is connected to the exhaust port 11. The second one-way valve 84 can prevent exhaust gas from the exhaust port 11 from flowing back into the first emission branch. The first one-way valve 3 can prevent exhaust gas in the first emission branch 4 from flowing back into the main three-way catalytic converter 1 when the first control valve 5 is open and the second control valve 10 is closed.
[0051] In summary, the hybrid vehicle engine exhaust gas treatment method provided in this application embodiment allows the main controller 6 to determine whether the hybrid vehicle's engine is in a preset steady-state thermal operating condition based on operating status parameters. When it is determined that the hybrid vehicle's engine is in the preset steady-state thermal operating condition, it indicates that the fuel combustion is complete and the engine exhaust gas contains fewer harmful substances. Therefore, the first control valve 5 is opened and the second control valve 10 is closed, so that the exhaust gas generated by the engine is treated by the main three-way catalytic converter 1 and discharged through the first exhaust branch 4 to the exhaust port 11. Understandably, based on the above, since the engine exhaust gas contains fewer harmful substances, only the main three-way catalytic converter 1 is needed to treat the exhaust gas to fully eliminate harmful substances and meet emission regulations, without the need for the auxiliary three-way catalytic converter 9 to treat the exhaust gas. This avoids the aging of the three-way catalyst in the auxiliary three-way catalytic converter 9, extends the service life of the three-way catalyst, saves costs, and achieves "flexible" treatment of engine exhaust gas that is fully automated and requires no manual intervention.
[0052] like Figure 4As shown, this application embodiment provides an engine exhaust gas treatment device for a hybrid vehicle, comprising a main controller 6 configured in the engine exhaust gas treatment system of the hybrid vehicle. It should be noted that the basic principle and technical effects of the engine exhaust gas treatment device for a hybrid vehicle provided in this application embodiment are the same as those in the above embodiments. For the sake of brevity, any parts not mentioned in this application embodiment can be referred to the corresponding content in the above embodiments. The system provided in this application embodiment also includes a parameter acquisition module 12, a main three-way catalytic converter 1, a first emission branch 4, a second emission branch 2, and an exhaust port 11. The first emission branch 4 and the second emission branch 2 are connected in parallel between the main three-way catalytic converter 1 and the exhaust port 11. The first emission branch 4 includes a first control valve 5, and the second emission branch 2 includes a second control valve 10 and a secondary three-way catalytic converter 9. The second control valve 10 is connected between the main three-way catalytic converter 1 and the secondary three-way catalytic converter 9. The main controller 6 is electrically connected to the parameter acquisition module 12, the first control valve 5, and the second control valve 10, respectively. The device provided in this application embodiment includes a data receiving unit, a working condition determination unit, and a valve control unit, wherein…
[0053] The data receiving unit is used to receive operating status parameters associated with the engine of the hybrid vehicle from the parameter acquisition module 12.
[0054] The operating condition determination unit is used to determine whether the engine of the hybrid vehicle is in a preset steady-state operating condition based on the operating status parameters.
[0055] The valve control unit is used to control the opening of the first control valve 5 and the closing of the second control valve 10 when the engine of the hybrid vehicle is determined to be in a preset steady-state operating condition, so that the exhaust gas generated by the engine is treated by the main three-way catalytic converter 1 and discharged from the exhaust port 11 through the first exhaust branch 4.
[0056] In some embodiments, the parameter acquisition module 12 includes at least a temperature sensor, a throttle opening sensor, and a power acquisition module; the operating status parameters associated with the hybrid vehicle's engine include at least the temperature of the coolant used to cool the engine, acquired by the temperature sensor; the rate of change of the throttle opening of the hybrid vehicle, acquired by the throttle opening sensor; and the engine's operating power, acquired by the power acquisition module. The operating condition determination unit is specifically used to determine that the hybrid vehicle's engine is in a preset thermo-engine steady-state operating condition when the coolant temperature is higher than a set temperature threshold, the rate of change of the throttle opening is less than a preset rate of change threshold, and the engine's operating power is lower than a set power threshold.
[0057] In some embodiments, the valve control unit is also used to control the first control valve 5 to close and the second control valve 10 to open when it is determined that the engine of the hybrid vehicle is not in a preset steady-state operating condition, so that the exhaust gas generated by the engine is processed by the main three-way catalytic converter 1 and the auxiliary three-way catalytic converter 9 in sequence and then discharged from the exhaust port 11.
[0058] In some embodiments, the parameter acquisition module 12 includes at least a temperature sensor, a throttle opening sensor, and a power acquisition module; the operating status parameters associated with the hybrid vehicle's engine include at least the temperature of the coolant used to cool the engine, acquired by the temperature sensor; the rate of change of the throttle opening of the hybrid vehicle, acquired by the throttle opening sensor; and the engine's operating power, acquired by the power acquisition module. The operating condition determination unit is specifically used to determine that the hybrid vehicle's engine is not in a preset steady-state operating condition when the coolant temperature is lower than or equal to a set temperature threshold, the rate of change of the throttle opening is greater than or equal to a preset rate of change threshold, or the engine's operating power is greater than or equal to a set power threshold.
[0059] In some implementations, the set temperature threshold range is 75 degrees Celsius to 85 degrees Celsius, the preset rate of change threshold range is 3° / s to 8° / s, and the set power threshold is 25 kW to 35 kW.
[0060] Please refer to Figure 1 and Figure 3 This application also provides an engine exhaust gas treatment system for a hybrid vehicle, including a parameter acquisition module 12, a main controller 6, a main three-way catalytic converter 1, a first emission branch 4, a second emission branch 2, and an exhaust port 11. The first emission branch 4 and the second emission branch 2 are connected in parallel between the main three-way catalytic converter 1 and the exhaust port 11. The first emission branch 4 includes a first control valve 5, and the second emission branch 2 includes a second control valve 10 and a secondary three-way catalytic converter 9. The second control valve 10 is disposed between the main three-way catalytic converter 1 and the secondary three-way catalytic converter 9. The main controller 6 is electrically connected to the parameter acquisition module 12, the first control valve 5, and the second control valve 10, respectively. The main controller 6 is used to execute the method executed by the main controller 6 in the above embodiments of this application.
[0061] In some embodiments, the system provided in this application also includes a first one-way valve 3 and a second one-way valve 84. The input end of the first one-way valve 3 is connected to the main three-way catalytic converter 1, the output end of the first one-way valve 3 is connected to the first control valve 5, the first control valve 5 is connected to the input end of the second one-way valve 84, and the output end of the first one-way valve 3 is connected to the exhaust port 11.
[0062] In addition, this application also provides a hybrid vehicle equipped with the engine exhaust gas treatment system of the hybrid vehicle provided in the first aspect of this application.
[0063] In addition, this application embodiment also provides a storage medium storing a computer program, which, when executed by the main controller, causes the main controller to perform the method provided in the above embodiments of this application.
[0064] In addition, this application also provides a computer program product, including a computer program that, when run, causes a hybrid vehicle to perform the method provided in the above embodiments of this application.
[0065] The above description does not provide detailed technical specifications regarding the structure of each layer. However, those skilled in the art should understand that layers and regions of desired shapes can be formed using various technical means. Furthermore, to form the same structure, those skilled in the art can also design methods that are not entirely identical to those described above. Additionally, although various embodiments have been described above, this does not mean that the measures in the various embodiments cannot be advantageously combined.
[0066] Although preferred embodiments of this application have been described, those skilled in the art, upon learning the basic inventive concept, can make other changes and modifications to these embodiments. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments as well as all changes and modifications falling within the scope of this application.
[0067] Obviously, those skilled in the art can make various modifications and variations to this application without departing from the spirit and scope of this application. Therefore, if such modifications and variations fall within the scope of the claims of this application and their equivalents, this application also intends to include such modifications and variations.
Claims
1. A method for treating engine exhaust gas of a hybrid vehicle, characterized in that, An engine exhaust gas treatment system for hybrid vehicles includes a parameter acquisition module, a main controller, a main three-way catalytic converter, a first emission branch, a second emission branch, and an exhaust port. The first emission branch and the second emission branch are connected in parallel between the main three-way catalytic converter and the exhaust port. The first emission branch includes a first control valve, and the second emission branch includes a second control valve and a secondary three-way catalytic converter. The second control valve is connected between the main three-way catalytic converter and the secondary three-way catalytic converter. The main controller is electrically connected to the parameter acquisition module, the first control valve, and the second control valve. The method includes: The parameter acquisition module collects operating status parameters associated with the engine of the hybrid vehicle; The main controller determines whether the engine of the hybrid vehicle is in a preset thermal steady-state operating condition based on the operating status parameters. When the main controller determines that the engine of the hybrid vehicle is in a preset steady-state thermal operation condition, it controls the first control valve to open and the second control valve to close, so that the exhaust gas generated by the engine is treated by the main three-way catalytic converter and discharged from the exhaust port through the first exhaust branch.
2. The method according to claim 1, characterized in that, The parameter acquisition module includes at least: a temperature sensor, a throttle opening sensor, and a power acquisition module; The operating status parameters associated with the engine of the hybrid vehicle include at least: the temperature of the coolant used to cool the engine, collected by the temperature sensor; the rate of change of the throttle opening of the hybrid vehicle, collected by the throttle opening sensor; and the operating power of the engine, collected by the power acquisition module.
3. The method according to claim 2, characterized in that, The main controller determines whether the hybrid vehicle's engine is in a preset steady-state thermal operation condition based on the operating status parameters, including: The main controller determines that the engine of the hybrid vehicle is in a preset thermal steady-state operating condition when the temperature of the coolant is higher than a set temperature threshold, the rate of change of the throttle opening is less than a preset rate of change threshold, and the operating power of the engine is lower than a set power threshold.
4. The method according to claim 1, characterized in that, After the main controller determines whether the hybrid vehicle's engine is in a preset steady-state thermal operating condition based on the operating status parameters, the method further includes: When the main controller determines that the engine of the hybrid vehicle is not in the preset steady-state operating condition, it controls the first control valve to close and the second control valve to open, so that the exhaust gas generated by the engine is processed by the main three-way catalytic converter and the auxiliary three-way catalytic converter in sequence before being discharged from the exhaust port.
5. The method according to claim 4, characterized in that, The parameter acquisition module includes at least: a temperature sensor, a throttle opening sensor, and a power acquisition module; the operating status parameters associated with the engine of the hybrid vehicle include at least: the temperature of the coolant used to cool the engine, acquired by the temperature sensor; the rate of change of the throttle opening of the hybrid vehicle, acquired by the throttle opening sensor; and the operating power of the engine, acquired by the power acquisition module. The main controller determines whether the engine of the hybrid vehicle is in a preset steady-state thermal engine operating condition based on the operating status parameters, including: The main controller determines that the engine of the hybrid vehicle is not in a preset steady-state operating condition when the temperature of the coolant is lower than or equal to a set temperature threshold, the rate of change of the throttle opening is greater than or equal to a preset rate of change threshold, or the operating power of the engine is greater than or equal to a set power threshold.
6. The method according to claim 3 or 5, characterized in that, The set temperature threshold range is 75 degrees Celsius to 85 degrees Celsius, the preset rate of change threshold range is 3° / s to 8° / s, and the set power threshold is 25 kW to 35 kW.
7. An engine exhaust gas treatment system for a hybrid vehicle, characterized in that, The device includes a parameter acquisition module, a main controller, a main three-way catalytic converter, a first emission branch, a second emission branch, and an exhaust port. The first emission branch and the second emission branch are connected in parallel between the main three-way catalytic converter and the exhaust port. The first emission branch includes a first control valve, and the second emission branch includes a second control valve and a secondary three-way catalytic converter. The second control valve is disposed between the main three-way catalytic converter and the secondary three-way catalytic converter. The main controller is electrically connected to the parameter acquisition module, the first control valve, and the second control valve, respectively. The main controller is used to execute the method executed by the main controller according to any one of claims 1-6.
8. The system according to claim 7, characterized in that, The system also includes a first one-way valve and a second one-way valve. The input end of the first one-way valve is connected to the main three-way catalytic converter, the output end of the first one-way valve is connected to the first control valve, the first control valve is connected to the input end of the second one-way valve, and the output end of the first one-way valve is connected to the exhaust port.
9. A hybrid vehicle, characterized in that, The hybrid vehicle is equipped with the engine exhaust gas treatment system as described in claim 7 or 8.
10. A storage medium storing a computer program, characterized in that, When the computer program is executed by the main controller, it causes the main controller to perform the method as described in any one of claims 1-6.