Device and method for trapping particulate matters in tail gas of range extender

Abstract

The invention discloses a range extender tail gas particulate matter trapping device and method, and the device comprises a particulate matter trapping unit which comprises a positive electrode and a negative electrode which are arranged in a staggered manner; the power supply unit is electrically connected with the positive electrode and the negative electrode, and the power supply unit is configured to selectively output a first voltage or a second voltage according to a control instruction; the controller is in communication connection with the power supply unit; the controller is used for acquiring a resistance value between the positive electrode and the negative electrode when the power supply unit outputs the first voltage, and determining the carbon loading capacity and / or the working state of the particle trapping unit based on the resistance value; and when the carbon loading capacity reaches a preset regeneration threshold value, the controller controls the power supply unit to switch and output a second voltage to the positive electrode and the negative electrode, and the current formed between the positive electrode and the negative electrode performs electric firing regeneration on the captured carbon particles. According to the invention, rapid heating and rapid regeneration of the trapping device are realized, and particulate matter emission of the range extender engine is reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of exhaust gas treatment, and in particular to a device and method for capturing particulate matter in exhaust gas of a range extender. Background Art

[0002] To reduce particulate matter emissions from range-extender engines, the industry generally employs a particulate filter (GPF) as an after-treatment device. These devices typically utilize high-temperature-resistant ceramic materials and a wall-flow honeycomb structure. Particulate matter generated by fuel combustion within the engine is captured by the GPF. As the engine operates, the amount of particulate matter collected by the GPF gradually increases, reducing the gas flow performance of the GPF. This increases the engine's exhaust backpressure, reducing combustion performance and power. Furthermore, existing GPF materials heat up slowly, taking a long time to reach the desired temperature, resulting in lengthy regeneration times and low efficiency. Summary of the Invention

[0003] In view of the above, the present invention aims to provide a device and method for capturing particulate matter in exhaust gas of a range extender to solve the above-mentioned technical problems.

[0004] The technical solution adopted in the present invention is as follows:

[0005] The present invention provides a device for capturing particulate matter from exhaust gas of a range extender, comprising:

[0006] a particle capture unit configured to capture carbon particles in the exhaust gas, the particle capture unit comprising a staggered positive electrode and a negative electrode;

[0007] a power supply unit electrically connected to the positive electrode and the negative electrode, the power supply unit being configured to selectively output a first voltage or a second voltage according to a control instruction, wherein a voltage value of the second voltage is higher than a voltage value of the first voltage;

[0008] and a controller, the controller being in communication with the power supply unit;

[0009] The controller is configured to obtain a resistance value between the positive electrode and the negative electrode when the power supply unit outputs the first voltage, and determine a carbon load and / or a working state of the particle capture unit based on the resistance value;

[0010] The controller is also used to control the power supply unit to switch and output the second voltage to the positive electrode and the negative electrode when the carbon load reaches a preset regeneration threshold, so as to utilize the current formed between the positive electrode and the negative electrode to perform electric burning regeneration on the captured carbon particles.

[0011] Optionally, the particle capture unit further includes an insulating resistor disposed between the positive electrode and the negative electrode, and the positive electrode, the negative electrode and the insulating resistor together constitute a mesh structure for capturing the carbon particles.

[0012] Optionally, the particle capture unit further includes a metal shell and an insulating ceramic layer nested in the metal shell, and the positive electrode and the negative electrode are stacked and laid inside the insulating ceramic layer.

[0013] Optionally, the controller determines the working state of the particle capture unit based on the resistance value, including:

[0014] When the resistance value is greater than a first preset resistance value, it is determined that an open circuit fault occurs in the particle capture unit;

[0015] When the resistance value is less than a second preset resistance value, it is determined that a short circuit fault occurs in the particle trap unit.

[0016] The present invention also provides a method for capturing particulate matter in exhaust gas of a range extender, comprising the following steps:

[0017] Providing a particle capture unit comprising staggered positive and negative electrodes, and utilizing the particle capture unit to capture carbon particles in exhaust gas;

[0018] Applying a first voltage to the positive electrode and the negative electrode, and measuring a resistance value between the positive electrode and the negative electrode;

[0019] determining a carbon loading of the particle capture unit based on the resistance value;

[0020] determining whether the carbon load reaches a preset regeneration threshold; and

[0021] If the carbon load reaches the preset regeneration threshold, the first voltage is stopped and a second voltage is applied to the positive electrode and the negative electrode. The voltage value of the second voltage is higher than the first voltage, and the captured carbon particles are electrically burned and regenerated by the current formed between the electrodes.

[0022] Optionally, the method for capturing particulate matter in exhaust gas of a range extender further includes the step of performing fault diagnosis on the particulate capture unit based on the resistance value after applying the first voltage:

[0023] If the resistance value is greater than a first preset resistance value, it is determined that an open circuit fault occurs in the particle capture unit;

[0024] If the resistance value is less than a second preset resistance value, it is determined that a short circuit fault occurs in the particle trap unit.

[0025] Optionally, the step of electro-burning regeneration further comprises:

[0026] During the process of applying the second voltage, the resistance value is continuously monitored.

[0027] Optionally, the step of electro-burning regeneration further comprises:

[0028] When the resistance value increases to a preset regeneration completion value, the application of the second voltage is stopped, and the application of the first voltage is switched to complete the regeneration process.

[0029] The present invention further provides a computing device, comprising: a processor and a memory storing a computer program, wherein the computer program executes the method described above when executed by the processor.

[0030] The present invention also provides a computer-readable storage medium storing instructions, which, when executed on a computer, enable the computer to execute the method described above.

[0031] The above solution of the present invention includes at least the following beneficial effects:

[0032] The above-mentioned solution of the present invention includes: a particulate trap unit configured to trap carbon particles in exhaust gas, the particulate trap unit comprising a staggered arrangement of positive and negative electrodes; a power supply unit electrically connected to the positive and negative electrodes, the power supply unit configured to selectively output a first voltage or a second voltage according to a control instruction, wherein the second voltage has a higher voltage than the first voltage; and a controller communicatively connected to the power supply unit. The controller is configured to obtain a resistance value between the positive and negative electrodes when the power supply unit outputs the first voltage, and determine the carbon loading and / or operating status of the particulate trap unit based on the resistance value. The controller is further configured to control the power supply unit to switch output of the second voltage to the positive and negative electrodes when the carbon loading reaches a preset regeneration threshold, thereby electrically burning and regenerating the trapped carbon particles using the current generated between the positive and negative electrodes. The solution of the present invention utilizes a metal mesh and ceramic resistor design to achieve rapid heating, rapid regeneration, and precise OBD monitoring. It calculates carbon loading through conductivity, eliminating the need for a differential pressure sensor or PM sensor. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] In order to make the purpose, technical solutions and advantages of the present invention more clear, the present invention will be further described below with reference to the accompanying drawings, in which:

[0034] Figure 1 Schematic diagram of a device for capturing particulate matter from exhaust gas of a range extender provided in an embodiment of the present invention.

[0035] Figure 2 This is a flow chart of a method for capturing particulate matter in exhaust gas from a range extender provided in an embodiment of the present invention.

[0036] Description of reference numerals:

[0037] 1. Particulate matter collection device housing; 2. Insulating ceramics; 3. Metal electrodes; 4. Ceramic insulation resistance. DETAILED DESCRIPTION

[0038] The following describes embodiments of the present invention in detail. Examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended only to explain the present invention and are not to be construed as limiting the present invention.

[0039] The present invention proposes an embodiment of a device for collecting particulate matter from exhaust gas of a range extender. Specifically, Figure 1 shown, including:

[0040] a particle capture unit configured to capture carbon particles in the exhaust gas, the particle capture unit comprising a staggered positive electrode and a negative electrode;

[0041] a power supply unit electrically connected to the positive electrode and the negative electrode, the power supply unit being configured to selectively output a first voltage or a second voltage according to a control instruction, wherein a voltage value of the second voltage is higher than a voltage value of the first voltage;

[0042] and a controller, the controller being in communication with the power supply unit;

[0043] The controller is configured to obtain a resistance value between the positive electrode and the negative electrode when the power supply unit outputs the first voltage, and determine a carbon load and / or a working state of the particle capture unit based on the resistance value;

[0044] The controller is also used to control the power supply unit to switch and output the second voltage to the positive electrode and the negative electrode when the carbon load reaches a preset regeneration threshold, so as to utilize the current formed between the positive electrode and the negative electrode to perform electric burning regeneration on the captured carbon particles.

[0045] In this embodiment, the shell 1 of the particulate matter capture device is a cylindrical metal material, a layer of insulating ceramic 2 is nested inside the shell, and the metal electrode 3 is arranged inside the insulating ceramic 2, wherein the positive electrode and the negative electrode are stacked; a metal electrode material that can withstand >1000°C is selected and evenly stacked within the range of the insulating ceramic, with a distance of 1mm between layers, and the electrode layers are positive and negative arranged in sequence; a ceramic insulating resistor 4 with a voltage resistance of >1000V and a temperature resistance of >1000°C is selected and nested in the middle of each electrode layer, and the distance between adjacent ceramic insulating resistors 4 is 1mm; the positive electrode, the negative electrode and the ceramic insulating resistor 4 together constitute a mesh structure for capturing the carbon particles.

[0046] The positive and negative poles of the electrode layer are respectively connected to the power supply unit PDU. The power supply unit PDU can select the 12V or 800V switch to turn on according to the signal sent by the controller ECU; the DC-DC converter DCDC is connected to the vehicle's 800V power supply and can output 12V voltage power supply and 800V high-voltage power supply; the controller ECU is connected to the power supply unit PDU and identifies the carbon load of the particulate capture device by reading the current and resistance values ​​between the high and low voltage of the power supply unit PDU.

[0047] Working principle:

[0048] Particle capture: Metal electrodes and insulation resistors are arranged to form a dense mesh structure and placed in the engine's exhaust after-treatment pipeline. When particulate matter in the engine exhaust flows through the mesh structure, it can be electrostatically adsorbed.

[0049] Measurement of particle capture: The number and resistance of the ceramic resistors between the positive and negative poles of the metal electrode are constant. When carbon particles are captured in the mesh, the positive and negative poles of the electrodes are connected through the carbon particles, causing the resistance value between the positive and negative poles of the electrodes to change. The carbon particle capture capacity of the particle capture device can be measured based on the difference in resistance value.

[0050] Particulate matter trap regeneration: When the carbon load captured by the particulate matter trap exceeds a certain limit, the controller ECU instructs the power supply unit (PDU) to disconnect the 12V power supply and connect it to the 800V high-voltage power supply. The 800V high voltage generates a large current in the particulate matter trap electrodes. This high current flows through the electrodes and carbon particles, generating a large amount of heat, which burns the carbon particles to produce carbon dioxide, achieving regeneration. When the resistance between the electrodes drops to a certain limit, the controller ECU instructs the power supply unit (PDU) to disconnect the 800V high-voltage power supply and connect it to the 12V power supply.

[0051] like Figure 2 As shown, an embodiment of the present invention further provides a method for capturing particulate matter in exhaust gas of a range extender, comprising the following steps:

[0052] Step S1, providing a particle capture unit comprising staggered positive and negative electrodes, and utilizing the particle capture unit to capture carbon particles in exhaust gas;

[0053] Step S2, applying a first voltage to the positive electrode and the negative electrode, and measuring the resistance value between the positive electrode and the negative electrode;

[0054] Step S3, determining the carbon loading of the particle capture unit based on the resistance value;

[0055] Step S4, determining whether the carbon load reaches a preset regeneration threshold;

[0056] In step S5, if the carbon load reaches the preset regeneration threshold, the first voltage is stopped and a second voltage is applied to the positive electrode and the negative electrode. The second voltage has a higher voltage than the first voltage, and the captured carbon particles are regenerated by electric burning through the current formed between the electrodes.

[0057] In this embodiment, the specific control strategy of the range extender exhaust particulate matter capture method is:

[0058] After the vehicle is started, the controller ECU issues a command to the power supply unit (PDU) to output 12V. The controller ECU then reads the resistance between the electrodes. If the resistance between the electrodes is greater than a first set value, the particle trap is considered to be open-circuited or leaking. If the resistance between the electrodes is less than a second set value, the particle trap is considered to be short-circuited or clogged.

[0059] If the inter-electrode resistance is less than the third set value, the system determines that the particulate filter has a high carbon load and can initiate regeneration. The ECU then instructs the PDU to output 800V to initiate regeneration. If the inter-electrode resistance exceeds the fourth set value during regeneration, regeneration is terminated and the ECU instructs the PDU to switch the output voltage to 12V.

[0060] Compared with traditional particle capture devices, the beneficial effects of this patent are as follows:

[0061] 1) Using high voltage instead of high-temperature combustion to eliminate carbon particulate matter does not generate high temperatures, has low safety risks, and can also reduce engine fuel consumption;

[0062] 2) The traditional regeneration method of the particle collection device heats up slowly and needs to maintain high temperature for a long time. The high-voltage electric burning regeneration method heats up quickly and has high regeneration efficiency;

[0063] 3) Traditional particulate matter collection devices require a pressure difference and a PM sensor to monitor carbon load and leakage. This patent can calculate the carbon load through electrical voltage division without the need for the above two sensors, simplifying the post-processing system structure and reducing costs.

[0064] An embodiment of the present invention further provides a computing device comprising: a processor and a memory storing a computer program, wherein the computer program, when executed by the processor, performs the method described in the above embodiment. All implementations of the above method embodiments are applicable to this embodiment and can achieve the same technical effects.

[0065] The present invention also provides a computer-readable storage medium storing instructions that, when executed on a computer, cause the computer to execute the method described in the above embodiment. All implementations of the above method embodiments are applicable to this embodiment and can achieve the same technical effects.

[0066] Those skilled in the art will appreciate that the units and algorithm steps of each example described in conjunction with the embodiments disclosed herein can be implemented in electronic hardware, or a combination of computer software and electronic hardware. Whether these functions are performed in hardware or software depends on the specific application and design constraints of the technical solution. Professionals and technicians can use different methods to implement the described functions for each specific application, but such implementation should not be considered beyond the scope of the present invention.

[0067] Those skilled in the art will clearly understand that, for the convenience and brevity of description, the specific working processes of the systems, devices and units described above can refer to the corresponding processes in the aforementioned method embodiments and will not be repeated here.

[0068] In the embodiments provided by the present invention, it should be understood that the disclosed devices and methods can be implemented in other ways. For example, the device embodiments described above are merely illustrative. For example, the division of the units is merely a logical function division. In actual implementation, there may be other division methods, such as multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. In addition, the mutual coupling or direct coupling or communication connection shown or discussed can be through some interface, indirect coupling or communication connection of devices or units, which can be electrical, mechanical or other forms.

[0069] The units described as separate components may or may not be physically separate, and the components shown as units may or may not be physical units, that is, they may be located in one place or distributed across multiple network units. Some or all of these units may be selected to achieve the purpose of this embodiment according to actual needs.

[0070] In addition, each functional unit in each embodiment of the present invention may be integrated into one processing unit, or each unit may exist physically separately, or two or more units may be integrated into one unit.

[0071] If the functions are implemented in the form of software functional units and sold or used as independent products, they can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the present invention, or the part that contributes to the prior art, or part of the technical solution, can be embodied in the form of a software product. This computer software product is stored in a storage medium and includes several instructions for enabling a computer device (which can be a personal computer, server, or network device, etc.) to execute all or part of the steps of the method described in each embodiment of the present invention. The aforementioned storage medium includes various media that can store program code, such as a USB flash drive, a mobile hard drive, ROM, RAM, a magnetic disk, or an optical disk.

[0072] In addition, it should be pointed out that in the apparatus and method of the present invention, it is obvious that each component or each step can be decomposed and / or recombined. These decompositions and / or recombinations should be regarded as equivalent solutions of the present invention. Moreover, the steps of performing the above-mentioned series of processing can naturally be performed in chronological order according to the order of description, but they do not necessarily need to be performed in chronological order, and some steps can be performed in parallel or independently of each other. For those of ordinary skill in the art, it can be understood that all or any steps or components of the method and apparatus of the present invention can be implemented in hardware, firmware, software or a combination thereof in any computing device (including a processor, storage medium, etc.) or a network of computing devices. This can be achieved by those of ordinary skill in the art using their basic programming skills after reading the description of the present invention.

[0073] Therefore, the purpose of the present invention can also be achieved by running a program or a group of programs on any computing device. The computing device can be a well-known general-purpose device. Therefore, the purpose of the present invention can also be achieved simply by providing a program product containing program code that implements the method or device. That is to say, such a program product also constitutes the present invention, and the storage medium storing such a program product also constitutes the present invention. Obviously, the storage medium can be any well-known storage medium or any storage medium developed in the future. It should also be pointed out that in the device and method of the present invention, it is obvious that each component or each step can be decomposed and / or recombined. These decompositions and / or recombinations should be regarded as equivalent schemes of the present invention. In addition, the steps of performing the above-mentioned series of processing can naturally be performed in chronological order according to the order of description, but do not necessarily need to be performed in chronological order. Certain steps can be performed in parallel or independently of each other.

[0074] The above is a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principles of the present invention. These improvements and modifications should also be regarded as within the scope of protection of the present invention.

Claims

1. A device for collecting particulate matter from exhaust gas of a range extender, characterized in that: include: a particle capture unit configured to capture carbon particles in the exhaust gas, the particle capture unit comprising a staggered positive electrode and a negative electrode; a power supply unit electrically connected to the positive electrode and the negative electrode, the power supply unit being configured to selectively output a first voltage or a second voltage according to a control instruction, wherein a voltage value of the second voltage is higher than a voltage value of the first voltage; and a controller, the controller being communicatively connected to the power supply unit; The controller is configured to obtain a resistance value between the positive electrode and the negative electrode when the power supply unit outputs the first voltage, and determine a carbon load and / or a working state of the particle capture unit based on the resistance value; The controller is also used to control the power supply unit to switch and output the second voltage to the positive electrode and the negative electrode when the carbon load reaches a preset regeneration threshold, so as to utilize the current formed between the positive electrode and the negative electrode to perform electric burning regeneration on the captured carbon particles.

2. The device for capturing particulate matter from exhaust gas of a range extender according to claim 1, characterized in that: The particle capture unit further includes an insulating resistor disposed between the positive electrode and the negative electrode. The positive electrode, the negative electrode, and the insulating resistor together constitute a mesh structure for capturing the carbon particles.

3. The device for capturing particulate matter from exhaust gas of a range extender according to claim 1 or 2, characterized in that: The particle capture unit further includes a metal shell and an insulating ceramic layer nested in the metal shell, and the positive electrode and the negative electrode are stacked and laid inside the insulating ceramic layer.

4. The device for capturing particulate matter from exhaust gas of a range extender according to claim 1, characterized in that: The controller determines the operating state of the particle capture unit based on the resistance value, including: When the resistance value is greater than a first preset resistance value, it is determined that an open circuit fault occurs in the particle capture unit; When the resistance value is less than a second preset resistance value, it is determined that a short circuit fault occurs in the particle trap unit.

5. A method for capturing particulate matter from range extender exhaust, characterized in that: The following steps are involved: Providing a particle capture unit comprising staggered positive and negative electrodes, and utilizing the particle capture unit to capture carbon particles in exhaust gas; Applying a first voltage to the positive electrode and the negative electrode, and measuring the resistance between the positive electrode and the negative electrode; determining a carbon loading of the particle capture unit based on the resistance value; determining whether the carbon load reaches a preset regeneration threshold; as well as If the carbon load reaches the preset regeneration threshold, the first voltage is stopped and a second voltage is applied to the positive electrode and the negative electrode. The voltage value of the second voltage is higher than the first voltage. The captured carbon particles are electrically burned and regenerated by the current formed between the positive electrode and the negative electrode.

6. The method for capturing particulate matter from exhaust gas of a range extender according to claim 5, characterized in that: The method further includes the step of performing a fault diagnosis on the particle trap unit based on the resistance value after applying the first voltage: If the resistance value is greater than a first preset resistance value, it is determined that an open circuit fault occurs in the particle capture unit; If the resistance value is less than a second preset resistance value, it is determined that a short circuit fault occurs in the particle trap unit.

7. The method for capturing particulate matter from exhaust gas of a range extender according to claim 5, characterized in that: The step of electric burning regeneration also includes: During the process of applying the second voltage, the resistance value is continuously monitored.

8. The method for capturing particulate matter from exhaust gas of a range extender according to claim 5, characterized in that: The step of electric burning regeneration also includes: When the resistance value increases to a preset regeneration completion value, the application of the second voltage is stopped, and the application of the first voltage is switched to complete the regeneration process.

9. A computing device, characterized in that include: A processor and a memory storing a computer program, wherein when the computer program is executed by the processor, the method according to any one of claims 1 to 8 is performed.

10. A computer-readable storage medium, characterized in that: The device stores instructions, which, when executed on a computer, enable the computer to execute the method according to any one of claims 1 to 8.

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