Gasoline engine particulate capture system and control method thereof

Abstract

The present invention discloses a gasoline engine particulate trap system and a control method thereof. The gasoline engine particulate trap system includes a gasoline engine particulate trap unit disposed in an exhaust pipe, a heating unit disposed within the gasoline engine particulate trap unit, a pressure sensing unit connected to the intake and outlet ends of the gasoline engine particulate trap unit, and a control unit electrically connected to the pressure sensing unit and the heating unit. When a pressure difference is greater than or equal to a first preset pressure difference, the heating unit is controlled to heat the gasoline engine particulate trap unit to improve the combustion efficiency of solid particulate pollutants in the gasoline engine particulate trap unit. By employing the above-mentioned technical means, by disposing the heating unit within the gasoline engine particulate trap unit and heating the gasoline engine particulate trap unit according to the pressure difference between the two sides of the gasoline engine particulate trap unit, solid particulate pollutants can be burned within the gasoline engine particulate trap unit, thereby reducing pollutant emissions.

Description

Technical Field

[0001] The present invention relates to the field of vehicle control technology, and in particular to a gasoline engine particulate capture system and a control method thereof. Background Art

[0002] With the introduction of relevant regulations on automobile emissions, Gasoline Particulate Filter (GPF) has become an important means to meet the particle number limit in automobile emission standards. However, gasoline engines will produce a large amount of carbon soot when driving at low temperatures and low speeds, causing carbon soot to accumulate too quickly inside the GPF. At the same time, the exhaust temperature is low under low-speed conditions in cities, and the carbon soot is difficult to meet regeneration conditions and cannot be eliminated quickly. In the long run, the GPF cannot be regenerated due to excessive carbon accumulation, which will cause the GPF to be blocked and damaged. In severe cases, the vehicle will not be able to drive normally, and the maintenance and replacement cycle and cost are extremely high.

[0003] Among the GPF technologies currently used in the market, most of them increase the temperature inside the GPF by adjusting parameters to increase the exhaust temperature, thereby achieving the conditions for GPF regeneration. This method will bring about adverse consequences such as increased fuel consumption, poor power, and poor driving experience. Summary of the Invention

[0004] The embodiment of the present invention provides a gasoline engine particulate capture system and a control method thereof, so as to directly heat the gasoline engine particulate capture unit, thereby burning solid particulate pollutants in the gasoline engine particulate capture unit and reducing pollutant emissions.

[0005] In a first aspect, an embodiment of the present invention provides a gasoline engine particulate capture system, comprising: an exhaust pipe, a gasoline engine particulate capture unit, a heating unit, a pressure sensing unit, and a control unit;

[0006] The gasoline engine particulate capture unit is arranged in the exhaust pipe to capture solid particulate pollutants in the exhaust gas;

[0007] The heating unit is provided in the gasoline engine particulate capture unit and is used to heat the gasoline engine particulate capture unit;

[0008] a pressure sensing unit, connected to the air inlet and the air outlet of the gasoline engine particulate capture unit, respectively, for sensing the pressure difference between the air inlet and the air outlet;

[0009] The control unit is electrically connected to the pressure sensing unit and the heating unit, respectively, and is used to control the heating unit to heat the gasoline engine particulate capture unit when the pressure difference is greater than or equal to a first preset pressure difference, so as to improve the combustion efficiency of the solid particulate pollutants in the gasoline engine particulate capture unit.

[0010] Optionally, the control unit is further used to control the heating unit to stop heating the gasoline engine particulate capture unit to restore the engine combustion parameters when the pressure difference is less than a second preset pressure difference; the second preset pressure difference is less than the first preset pressure difference.

[0011] Optionally, the gasoline engine particulate capture system further includes a temperature sensing unit, and the control unit is further electrically connected to the temperature sensing unit;

[0012] The control unit is further configured to control the heating unit to perform first-stage heating at a first heating power when the engine is started; control the heating unit to perform second-stage heating at a second heating power when the temperature in the gasoline particulate capture unit reaches a first preset temperature; control the heating unit to perform third-stage heating at a third heating power during the second-stage heating process and when the pressure difference is greater than or equal to the first preset pressure difference; control the heating unit to perform fourth-stage heating at a fourth heating power when the temperature in the gasoline particulate capture unit reaches a second preset temperature until the pressure difference is less than the second preset pressure difference, and then control the heating unit to stop heating the gasoline particulate capture unit; the second heating power is less than the first heating power, the third heating power is equal to the first heating power, the fourth heating power is less than the second heating power, and the second preset temperature is greater than the first preset temperature.

[0013] Optionally, the gasoline engine particulate capture system further includes: an oxygen sensing unit;

[0014] The oxygen sensor unit is arranged in the exhaust pipe and is used to detect the air-fuel ratio of the exhaust gas in the exhaust pipe;

[0015] The control unit is also electrically connected to the oxygen sensor unit, and is used for heating in the fourth stage and controlling the air-fuel ratio to be K;

[0016] Among them, 1.05≤K≤1.08.

[0017] Optionally, the gasoline engine particulate capture system further includes: an inverter unit and a power supply unit;

[0018] The inverter unit is electrically connected to the power supply unit and the heating unit respectively, and is used to convert the direct current provided by the power supply unit into alternating current for the operation of the heating unit.

[0019] Optionally, the gasoline engine particulate capture system further includes: a three-way catalytic unit;

[0020] The three-way catalytic unit is arranged in the exhaust pipe to purify harmful gases in the exhaust pipe.

[0021] Optionally, the heating unit is an infrared radiator;

[0022] The volume of the infrared radiator is M, and the volume of the gasoline engine particulate capture unit is N;

[0023] Among them, 2 / 3≤M / N<1.

[0024] In a second aspect, an embodiment of the present invention further provides a method for controlling gasoline engine particulate capture, which is applied to the gasoline engine particulate capture system according to any one of the first aspects. The control method includes:

[0025] Obtaining a pressure difference between an air inlet and an air outlet of the gasoline engine particulate capture unit;

[0026] When the pressure difference is greater than or equal to a first preset pressure difference, a first control signal is output to control the heating unit to heat the gasoline engine particulate capture unit to improve the combustion efficiency of the solid particulate pollutants in the gasoline engine particulate capture unit.

[0027] Optionally, the control method further includes:

[0028] When the pressure difference is less than a second preset pressure difference, a second control signal is output to control the heating unit to stop heating the gasoline engine particulate capture unit to restore the combustion parameters of the engine; the second preset pressure difference is less than the first preset pressure difference.

[0029] Optionally, before outputting a first control signal to control the heating unit to heat the gasoline particulate trap unit when the pressure difference is greater than or equal to a first preset pressure difference to improve the combustion efficiency of the solid particulate pollutants in the gasoline particulate trap unit, the method further includes:

[0030] When the engine is started, a third control signal is output to control the heating unit to perform first-stage heating at a first heating power;

[0031] When the temperature in the gasoline engine particulate trap unit reaches a first preset temperature, outputting a fourth control signal to control the heating unit to perform second-stage heating at a second heating power;

[0032] When the pressure difference is greater than or equal to a first preset pressure difference, outputting a first control signal to control the heating unit to heat the gasoline engine particulate trap unit includes:

[0033] During the second stage heating process and when the pressure difference is greater than or equal to the first preset pressure difference, outputting a first control signal to control the heating unit to perform third stage heating at a third heating power;

[0034] When the pressure difference is less than a second preset pressure difference, outputting a second control signal to control the heating unit to stop heating the gasoline engine particulate trap unit includes:

[0035] When the temperature in the gasoline engine particulate capture unit reaches a second preset temperature, a fifth control signal is output to control the heating unit to perform fourth stage heating at a fourth heating power until the pressure difference is less than the second preset pressure difference, and then a second control signal is output to control the heating unit to stop heating the gasoline engine particulate capture unit; the second heating power is less than the first heating power, the third heating power is equal to the first heating power, the fourth heating power is less than the second heating power, and the second preset temperature is greater than the first preset temperature.

[0036] The technical solution provided by the embodiments of the present invention, by installing a gasoline engine particulate trap unit in the exhaust pipe, can capture solid particulate pollutants in the exhaust gas, concentrating the solid particulate pollutants in the gasoline engine particulate trap unit. Furthermore, by installing a heating unit within the gasoline engine particulate trap unit, direct heating of the gasoline engine particulate trap unit can be achieved. Specifically, when the pressure difference between the intake and outlet ends of the gasoline engine particulate trap unit is greater than or equal to a first preset pressure difference, it indicates that a large amount of solid particulate pollutants are captured in the gasoline engine particulate trap unit. The gasoline engine particulate trap unit is then heated by the heating unit, which can fully combust the solid particulate pollutants in the gasoline engine particulate trap unit. This can prevent clogging of the gasoline engine particulate trap unit and reduce pollutant emissions. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] Figure 1 A schematic structural diagram of a gasoline engine particulate capture system provided by an embodiment of the present invention;

[0038] Figure 2 A connection diagram of a control unit in a gasoline engine particulate capture system provided by an embodiment of the present invention;

[0039] Figure 3 A flow chart of a gasoline engine particulate capture control method provided by an embodiment of the present invention;

[0040] Figure 4 A schematic flow chart of another gasoline engine particulate capture control method provided by an embodiment of the present invention;

[0041] Figure 5A flowchart of another method for controlling particulate matter capture in a gasoline engine provided by an embodiment of the present invention. DETAILED DESCRIPTION

[0042] The present invention will be further described in detail below with reference to the accompanying drawings and examples. It will be understood that the specific embodiments described herein are intended only to illustrate the present invention and are not intended to limit the present invention. It should also be noted that, for ease of description, the accompanying drawings only illustrate portions relevant to the present invention, not all structures.

[0043] Figure 1 A schematic structural diagram of a gasoline engine particulate collection system provided by an embodiment of the present invention is shown in FIG. Figure 2 A connection diagram of a control unit in a gasoline engine particulate collection system provided by an embodiment of the present invention is shown in FIG. Figure 1 and Figure 2 As shown, the gasoline engine particulate capture system includes: an exhaust pipe 10, a gasoline engine particulate capture unit 20, a heating unit 30, a pressure sensing unit 40 and a control unit 1000; the gasoline engine particulate capture unit 20 is arranged in the exhaust pipe 10 pipeline, and is used to capture solid particulate pollutants in the exhaust gas; the heating unit 30 is arranged in the gasoline engine particulate capture unit 20, and is used to heat the gasoline engine particulate capture unit 20; the pressure sensing unit 40 is respectively connected to the intake end and the outlet end of the gasoline engine particulate capture unit 20, and is used to sense the pressure difference between the intake end and the outlet end; the control unit 1000 is respectively electrically connected to the pressure sensing unit 40 and the heating unit 30, and is used to control the heating unit 30 to heat the gasoline engine particulate capture unit 20 when the pressure difference is greater than or equal to a first preset pressure difference, so as to improve the combustion efficiency of the solid particulate pollutants in the gasoline engine particulate capture unit 20.

[0044] Specifically, the gasoline particulate trap unit 20 is disposed in the exhaust pipe 10 and is capable of capturing solid particulate pollutants generated by combustion in the engine 50. For example, the solid particulate pollutants may be soot. A greater amount of soot captured within the gasoline particulate trap unit 20 indicates a greater carbon load, indicating a higher likelihood of clogging of the gasoline particulate trap unit 20. Resetting and regenerating the gasoline particulate trap unit 20 is necessary to reduce the amount of solid particulate pollutants.

[0045] Furthermore, the two ends of the pressure sensing unit 40 are respectively connected to the intake and outlet ends of the gasoline particulate trap unit 20, that is, the pressure sensing unit 40 can detect the pressure difference between the intake and outlet ends of the gasoline particulate trap unit 20. The heating unit 30 is disposed within the gasoline particulate trap unit 20. When the pressure difference is greater than or equal to a first preset pressure difference, the control unit 1000 can control the heating unit 30 to heat the gasoline particulate trap unit 20, thereby causing the solid particulate pollutants to be burned within the gasoline particulate trap unit 20, thereby improving the combustion efficiency of the solid particulate pollutants in the gasoline particulate trap unit 20, reducing the soot content, and achieving regeneration of the solid particulate pollutants within the gasoline particulate trap unit 20.

[0046] For example, the first preset pressure difference can be 2000 hPa. When the pressure difference is 2000 hPa, the mass of soot trapped in the gasoline engine particulate trap unit 20 is 4 g. It is understood that the pressure difference between the intake and outlet ends of the gasoline engine particulate trap unit 20 is proportional to the mass of soot in the gasoline engine particulate trap unit 20. In other words, the greater the pressure difference, the greater the soot mass, i.e., the more solid particulate pollutants in the gasoline engine particulate trap unit 20, and the easier it is to clog. The corresponding relationship between the pressure difference and the soot mass is shown in Table 1:

[0047] Table 1

[0048] Pressure difference (hPa) 100 200 500 1000 2000 10000 Soot mass (g) 0.5 1 2 3 4 8

[0049] For further reference, Figure 1 The heating unit 30 is an infrared radiator 301 ; the volume of the infrared radiator 301 is M, and the volume of the gasoline engine particulate collection unit 20 is N; wherein, 2 / 3≤M / N<1.

[0050] Specifically, the heating unit 30 is an infrared radiator 301, which can generate medium-wave infrared rays, thereby rapidly heating the gasoline engine particulate trap unit 20. In addition, the volume M of the infrared radiator 301 and the volume N of the gasoline engine particulate trap unit 20 satisfy: 2 / 3≤M / N<1. Since the infrared radiator 301 is arranged in the gasoline engine particulate trap unit 20 and the volume of the infrared radiator 301 is close to the volume of the gasoline engine particulate trap unit 20, the infrared radiator 301 can achieve uniform and large-area rapid heating of the interior of the gasoline engine particulate trap unit 20.

[0051] The gasoline engine particulate trap system provided by an embodiment of the present invention, by disposing a gasoline engine particulate trap unit in the exhaust pipe, can capture solid particulate pollutants in the exhaust gas, concentrating the solid particulate pollutants in the gasoline engine particulate trap unit. Furthermore, by disposing a heating unit within the gasoline engine particulate trap unit, the gasoline engine particulate trap unit can be directly heated. Specifically, when the pressure difference between the intake and outlet ends of the gasoline engine particulate trap unit is greater than or equal to a first preset pressure difference, it indicates that a large amount of solid particulate pollutants are captured in the gasoline engine particulate trap unit. The gasoline engine particulate trap unit is then heated by the heating unit, allowing the solid particulate pollutants to be fully combusted in the gasoline engine particulate trap unit. This prevents clogging of the gasoline engine particulate trap unit and reduces pollutant emissions.

[0052] Optional, continue to refer to Figure 1 and Figure 2 The control unit 1000 is further configured to control the heating unit 30 to stop heating the gasoline engine particulate capture unit 20 to restore the combustion parameters of the engine 50 when the pressure difference is less than a second preset pressure difference; the second preset pressure difference is less than the first preset pressure difference.

[0053] Specifically, when the pressure difference of the gasoline engine particulate capture unit 20 is less than the second preset pressure difference, it means that the content of solid particulate pollutants in the gasoline engine particulate capture unit 20 is small, and there is no need to regenerate the solid particulate pollutants inside the gasoline engine particulate capture unit 20. The control unit 1000 can control the heating unit 30 to stop heating the gasoline engine particulate capture unit 20 and restore the combustion parameters of the engine, that is, restore the air-fuel ratio of the engine 50 to 1, thereby avoiding energy waste.

[0054] For example, the second preset pressure difference may be 100 hPa. When the pressure difference is 100 hPa, the mass of soot trapped in the gasoline engine particulate trap unit 20 is 0.5 g.

[0055] For further reference, Figure 1 and Figure 2The gasoline engine particulate trap system also includes a temperature sensing unit 60, and the control unit 1000 is also electrically connected to the temperature sensing unit 60; the control unit 1000 is also used to control the heating unit 30 to perform a first stage heating with a first heating power when the engine 50 is started; when the temperature in the gasoline engine particulate trap unit 20 reaches a first preset temperature, control the heating unit 30 to perform a second stage heating with a second heating power; during the second stage heating process and when the pressure difference is greater than or equal to the first preset pressure difference, control the heating unit 30 to perform a third stage heating with a third heating power; when the temperature in the gasoline engine particulate trap unit 20 reaches a second preset temperature, control the heating unit 30 to perform a fourth stage heating with a fourth heating power until the pressure difference is less than the second preset pressure difference, and then control the heating unit 30 to stop heating the gasoline engine particulate trap unit 20; the second heating power is less than the first heating power, the third heating power is equal to the first heating power, the fourth heating power is less than the second heating power, and the second preset temperature is greater than the first preset temperature.

[0056] Specifically, when the engine 50 is started, the control unit 1000 controls the heating unit 30 to heat the gasoline particulate trap unit 20 at a first power. For example, the first heating power may be full power. This allows for rapid heating of the gasoline particulate trap unit 20 upon startup of the engine 50, rapidly raising the internal temperature of the gasoline particulate trap unit 20. When the temperature within the gasoline particulate trap unit 20 reaches a first preset temperature, the control unit 1000 controls the heating unit 30 to perform a second stage of heating at a second heating power. For example, the first preset temperature may be 500°C, and the second heating power may be 75% of the full power. In other words, when the engine 50 is first started, the heating unit 30 heats the gasoline particulate trap unit 20 at full power. When the temperature within the gasoline particulate trap unit 20 reaches 500°C, the heating unit 30 may continue to heat the gasoline particulate trap unit 20 at 75% power for the second stage. If, during the second stage of heating, the pressure difference between the intake and outlet ends of the gasoline engine particulate capture unit 20 is greater than or equal to the first preset pressure difference, it indicates that the content of solid particulate pollutants inside the gasoline engine particulate capture unit 20 is high and needs to be regenerated, that is, the control unit 1000 can control the heating unit 30 to continue to rapidly heat the gasoline engine particulate capture unit 20 at full power to achieve the regeneration combustion conditions of the solid particulate pollutants, so that the solid particulate pollutants are burned in the gasoline engine particulate capture unit 20, thereby reducing the carbon soot content.

[0057] Furthermore, when the temperature within the gasoline particulate trap unit 20 reaches a second preset temperature, the heating unit 30 is controlled to perform a fourth stage of heating at a fourth heating power until the pressure difference is less than the second preset pressure difference, at which point the heating unit 30 is controlled to stop heating the gasoline particulate trap unit 20. For example, the fourth heating power may be half the full power, i.e., 50%. The second preset temperature may be 680°C, the regeneration temperature for solid particulate matter. In other words, when the temperature within the gasoline particulate trap unit 20 reaches 680°C, solid particulate matter can be regenerated through combustion. At this point, the heating unit 30 no longer needs to heat the gasoline particulate trap unit 20. In other words, the control unit 1000 can control the heating unit 30 to stop heating the gasoline particulate trap unit 20. This allows the heating unit 30 to heat the gasoline particulate trap unit 20 and regenerate solid particulate matter. Furthermore, the control unit 1000 can control the heating unit 30's heating power during different heating stages to ensure heating efficiency and energy conservation.

[0058] For example, the first heating power is equal to the third heating power, and both can be full power. The second heating power can be 75% of the full power. The fourth heating power can be 50% of the full power.

[0059] Optional, continue to refer to Figure 1 and Figure 2 The gasoline engine particulate capture system also includes: an oxygen sensor unit 70; the oxygen sensor unit 70 is arranged in the exhaust pipe 10, and is used to detect the air-fuel ratio of the exhaust in the exhaust pipe 10; the control unit 1000 is also electrically connected to the oxygen sensor unit 70, and is used to heat in the fourth stage and control the air-fuel ratio to K; wherein 1.05≤K≤1.08.

[0060] Specifically, the oxygen sensor unit 70 is installed in the exhaust pipe 10, enabling real-time monitoring of the air-fuel ratio (i.e., the mass ratio between air and fuel) in the exhaust pipe 10. Furthermore, during the fourth heating phase, i.e., the solid particulate matter regeneration phase, the control unit 1000 controls the air-fuel ratio K to satisfy the following: 1.05 ≤ K ≤ 1.08. In other words, the mass of air is greater than the mass of fuel, ensuring that the solid particulate matter fully reacts with oxygen and burns, thereby reducing pollutant emissions.

[0061] Optional, continue to refer to Figure 1 The gasoline engine particulate capture system further includes: an inverter unit 80 and a power supply unit 90; the inverter unit 80 is electrically connected to the power supply unit 90 and the heating unit 30 respectively, and is used to convert the direct current provided by the power supply unit 90 into alternating current for the operation of the heating unit 30.

[0062] Specifically, the inverter unit 80 is electrically connected to the power supply unit 90 and the heating unit 30. The inverter unit 80 converts the 380V DC power provided by the power supply unit 90 into 380V AC power with a frequency of 5-30 kHz for use by the heating unit 30. Furthermore, by adjusting the operating frequency of the inverter unit 80, the power of the heating unit 30 can be varied, thereby enabling the heating unit 30 to operate at different power levels during different heating stages, thereby achieving energy savings.

[0063] Exemplarily, the power supply unit 90 may be a power battery.

[0064] Optional, continue to refer to Figure 1 The gasoline engine particulate capture system further includes: a three-way catalytic unit 100; the three-way catalytic unit 100 is arranged in the exhaust pipe 10 to purify harmful gases in the exhaust pipe 10.

[0065] Specifically, the three-way catalytic unit 100 can be a purification device located in the exhaust pipe 10, which can convert harmful gases such as CO, HC and NOx discharged from the engine 50 into harmless CO2, H2O and N2 through oxidation and reduction, thereby reducing emissions.

[0066] In summary, the gasoline engine particulate capture system provided by the embodiment of the present invention has a heating unit provided in the gasoline engine particulate capture unit, and the heating unit is an infrared radiator. The power supply unit and the inverter unit can provide the infrared radiator with the AC voltage required for operation, so that the infrared radiator generates medium-wave infrared rays, thereby heating the gasoline engine particulate capture unit, and the heating power of the infrared radiator can be changed by changing the output frequency of the inverter unit, so that the infrared radiator heats the gasoline engine particulate capture unit with different working powers in different heating stages. In this way, on the one hand, regeneration can be carried out when the content of solid particulate pollutants in the gasoline engine particulate capture unit is high, and on the other hand, the performance of fast heating time, high heating efficiency and power saving can be achieved.

[0067] Based on the same inventive concept, an embodiment of the present invention further provides a method for controlling gasoline engine particulate capture, which is applied to the gasoline engine particulate capture system described in the above embodiment. Figure 3 A flow chart of a gasoline engine particulate capture control method provided by an embodiment of the present invention is shown in FIG. Figure 3 As shown, the control method includes:

[0068] S101: Obtain a pressure difference between an air inlet and an air outlet of a gasoline engine particulate capture unit.

[0069] Specifically, the pressure sensing unit is connected to the intake and outlet ends of the gasoline engine particulate capture unit respectively, and the control unit is electrically connected to the pressure sensing unit. The control unit can obtain the pressure difference between the intake and outlet ends of the gasoline engine particulate capture unit.

[0070] S102 : When the pressure difference is greater than or equal to a first preset pressure difference, output a first control signal to control the heating unit to heat the gasoline engine particulate trap unit to improve the combustion efficiency of solid particulate pollutants in the gasoline engine particulate trap unit.

[0071] For example, the first preset pressure difference may be 2000 hPa. The first control signal may be understood as a control signal output by the control unit to control the heating unit to heat the gasoline engine particulate trap unit.

[0072] Specifically, when the pressure difference is greater than or equal to 2000 hPa, it indicates a high content of solid particulate matter within the gasoline engine particulate trap (PGT), i.e., a soot mass of 4g. This could cause clogging of the PGT and high pollutant emissions. Therefore, the control unit can output a first control signal to control the heating unit to heat the PGT to regenerate the solid particulate matter. In other words, heating the PGT by the heating unit can fully combust the solid particulate matter, thereby improving the combustion efficiency of the solid particulate matter in the PGT.

[0073] In a method for controlling gasoline engine particulate capture provided by an embodiment of the present invention, a control unit can control a heating unit to heat the gasoline engine particulate capture unit based on a pressure difference between the intake and outlet ends of the gasoline engine particulate capture unit detected by a pressure sensing unit. When the heating unit is operating, solid particulate pollutants can be regenerated in the gasoline engine particulate capture unit.

[0074] Optionally, based on the above embodiment, Figure 4 A flow chart of another gasoline engine particulate capture control method provided by an embodiment of the present invention is shown as follows: Figure 4 As shown, the control method includes:

[0075] S201: Obtain a pressure difference between an air inlet and an air outlet of a gasoline engine particulate capture unit.

[0076] S202 : When the pressure difference is greater than or equal to a first preset pressure difference, output a first control signal to control the heating unit to heat the gasoline engine particulate trap unit to improve the combustion efficiency of solid particulate pollutants in the gasoline engine particulate trap unit.

[0077] S203. When the pressure difference is less than a second preset pressure difference, output a second control signal to control the heating unit to stop heating the gasoline engine particulate trap unit to restore the combustion parameters of the engine; the second preset pressure difference is less than the first preset pressure difference.

[0078] For example, the second preset pressure difference may be 100 hPa. The second control signal may be understood as a control signal output by the control unit to control the heating unit to stop heating the gasoline engine particulate trap unit.

[0079] Specifically, when the pressure difference is less than 100hPa, it indicates that the content of solid particulate pollutants inside the gasoline engine particulate capture unit is low, that is, the mass of soot is 0.5g, and there is no need to regenerate the solid particulate pollutants. Therefore, the control unit can control the heating unit to stop heating the gasoline engine particulate capture unit and restore the engine's combustion parameters, that is, restore the engine's air-fuel ratio to 1, thereby avoiding energy waste.

[0080] In a gasoline engine particulate trap control method provided by an embodiment of the present invention, a control unit can control a heating unit to heat or stop the gasoline engine particulate trap unit according to a pressure difference between an intake end and an outlet end of the gasoline engine particulate trap unit detected by a pressure sensing unit.

[0081] Optionally, based on the above embodiment, Figure 5 A flow chart of another gasoline engine particulate capture control method provided by an embodiment of the present invention is shown as follows: Figure 5 As shown, the control method includes:

[0082] S301: Obtain a pressure difference between an air inlet and an air outlet of a gasoline engine particulate capture unit.

[0083] S302: When the engine is started, output a third control signal to control the heating unit to perform first-stage heating at a first heating power.

[0084] For example, the third control signal may be understood as a control signal output by the control unit to control the heating unit to perform the first stage heating of the gasoline engine particulate trap unit at the first heating power.

[0085] Specifically, when the engine is started, the control unit controls the heating unit to heat the gasoline particulate trap unit at a first power. For example, the first heating power may be full power, which enables rapid heating of the gasoline particulate trap unit upon engine startup, rapidly increasing the internal temperature of the gasoline particulate trap unit.

[0086] S303: When the temperature in the gasoline engine particulate trap unit reaches a first preset temperature, output a fourth control signal to control the heating unit to perform second-stage heating at a second heating power.

[0087] For example, the first preset temperature may be 500° C. The second heating power may be 75% of the full power. The fourth control signal may be understood as a control signal output by the control unit to control the heating unit to perform the second stage heating of the gasoline engine particulate filter unit at the second heating power.

[0088] Specifically, when the engine is just started, the heating unit heats the gasoline engine particulate trap unit at full power until the temperature inside the gasoline engine particulate trap unit reaches 500°C. The heating unit can then continue to heat the gasoline engine particulate trap unit at 75% power for the second stage.

[0089] S304. During the second stage heating process and when the pressure difference is greater than or equal to the first preset pressure difference, output a first control signal to control the heating unit to perform third stage heating at a third heating power to improve the combustion efficiency of solid particulate pollutants in the gasoline engine particulate capture unit.

[0090] Specifically, during the second stage of heating, if the pressure difference between the intake end and the outlet end of the gasoline engine particulate capture unit is greater than or equal to the first preset pressure difference, it means that the content of solid particulate pollutants inside the gasoline engine particulate capture unit is high and needs to be regenerated. That is, the control unit can control the heating unit to continue to rapidly heat up the gasoline engine particulate capture unit at full power to achieve the regeneration combustion conditions of the solid particulate pollutants, so that the solid particulate pollutants are burned in the gasoline engine particulate capture unit, thereby reducing the carbon soot content.

[0091] S305. When the temperature in the gasoline engine particulate trap unit reaches a second preset temperature, output a fifth control signal to control the heating unit to perform fourth stage heating at a fourth heating power until the pressure difference is less than the second preset pressure difference, and then output a second control signal to control the heating unit to stop heating the gasoline engine particulate trap unit.

[0092] Among them, the second heating power is less than the first heating power, the third heating power is equal to the first heating power, the fourth heating power is less than the second heating power, and the second preset temperature is greater than the first preset temperature.

[0093] For example, the second preset temperature may be 680° C. The fifth control signal may be understood as a control signal output by the control unit to control the heating unit to perform a fourth stage of heating the gasoline engine particulate trap unit at a fourth heating power.

[0094] Specifically, when the temperature inside the gasoline engine particulate capture unit reaches 680°C, solid particulate pollutants can be regenerated through combustion. At this time, the heating unit no longer needs to heat the gasoline engine particulate capture unit, that is, the control unit can control the heating unit to stop heating the gasoline engine particulate capture unit. In this way, on the one hand, the gasoline engine particulate capture unit can be heated by the heating unit to achieve the regeneration of solid particulate pollutants. On the other hand, the heating power of the heating unit in different heating stages can be controlled by the control unit to ensure heating efficiency and power saving effect.

[0095] The control method for gasoline engine particulate capture provided in an embodiment of the present invention heats the gasoline engine particulate capture unit at different operating powers in different heating stages through a heating unit. This allows, on the one hand, regeneration to be performed when the content of solid particulate pollutants in the gasoline engine particulate capture unit is high, and on the other hand, the heating time is fast, the heating efficiency is high, and energy saving is achieved.

[0096] Note that the above are only preferred embodiments of the present invention and the technical principles employed. Those skilled in the art will appreciate that the present invention is not limited to the specific embodiments described herein, and that various obvious changes, readjustments, combinations, and substitutions are possible for those skilled in the art without departing from the scope of the present invention. Therefore, although the present invention has been described in detail through the above embodiments, the present invention is not limited to the above embodiments and may include many other equivalent embodiments without departing from the scope of the present invention. The scope of the present invention is determined by the scope of the appended claims.

Claims

1. A gasoline engine particulate capture system, characterized in that: include: Exhaust pipe, gasoline engine particulate trap unit, heating unit, pressure sensing unit and control unit; The gasoline engine particulate capture unit is arranged in the exhaust pipe to capture solid particulate pollutants in the exhaust gas; The heating unit is provided in the gasoline engine particulate capture unit and is used to heat the gasoline engine particulate capture unit; a pressure sensing unit, connected to the air inlet and the air outlet of the gasoline engine particulate capture unit, respectively, for sensing the pressure difference between the air inlet and the air outlet; The control unit is electrically connected to the pressure sensing unit and the heating unit, respectively, and is configured to control the heating unit to heat the gasoline particulate trap unit when the pressure difference is greater than or equal to a first preset pressure difference, so as to improve the combustion efficiency of the solid particulate pollutants in the gasoline particulate trap unit; Wherein, the gasoline engine particulate capture system further includes a temperature sensing unit, and the control unit is also electrically connected to the temperature sensing unit; The control unit is further configured to control the heating unit to perform first-stage heating at a first heating power when the engine is started; control the heating unit to perform second-stage heating at a second heating power when the temperature in the gasoline particulate trap unit reaches a first preset temperature; control the heating unit to perform third-stage heating at a third heating power during the second-stage heating process and when the pressure difference is greater than or equal to the first preset pressure difference; control the heating unit to perform fourth-stage heating at a fourth heating power when the temperature in the gasoline particulate trap unit reaches a second preset temperature until the pressure difference is less than the second preset pressure difference, and then control the heating unit to stop heating the gasoline particulate trap unit; the second preset pressure difference is less than the first preset pressure difference; The second heating power is less than the first heating power, the third heating power is equal to the first heating power, the fourth heating power is less than the second heating power, and the second preset temperature is greater than the first preset temperature.

2. The gasoline engine particulate capture system according to claim 1, characterized in that: The gasoline engine particulate capture system further includes: an oxygen sensing unit; The oxygen sensor unit is arranged in the exhaust pipe and is used to detect the air-fuel ratio of the exhaust gas in the exhaust pipe; The control unit is also electrically connected to the oxygen sensor unit, and is used for heating in the fourth stage and controlling the air-fuel ratio to be K; Among them, 1.05≤K≤1.

08.

3. The gasoline engine particulate capture system according to claim 1, characterized in that: The gasoline engine particulate capture system further includes: an inverter unit and a power supply unit; The inverter unit is electrically connected to the power supply unit and the heating unit respectively, and is used to convert the direct current provided by the power supply unit into alternating current for the operation of the heating unit.

4. The gasoline engine particulate capture system according to claim 1, characterized in that: The gasoline engine particulate capture system further includes: a three-way catalytic unit; The three-way catalytic unit is arranged in the exhaust pipe to purify harmful gases in the exhaust pipe.

5. The gasoline engine particulate capture system according to claim 1, characterized in that: The heating unit is an infrared radiator; The volume of the infrared radiator is M, and the volume of the gasoline engine particulate capture unit is N; Among them, 2 / 3≤M / N<1.

6. A gasoline engine particulate capture control method, applied to the gasoline engine particulate capture system according to any one of claims 1 to 5, characterized in that: The control method includes: Obtaining a pressure difference between an air inlet and an air outlet of the gasoline engine particulate capture unit; When the pressure difference is greater than or equal to a first preset pressure difference, outputting a first control signal to control the heating unit to heat the gasoline engine particulate trap unit to improve the combustion efficiency of the solid particulate pollutants in the gasoline engine particulate trap unit; Wherein, before outputting a first control signal to control the heating unit to heat the gasoline engine particulate trap unit when the pressure difference is greater than or equal to a first preset pressure difference to improve the combustion efficiency of the solid particulate pollutants in the gasoline engine particulate trap unit, the method further includes: When the engine is started, a third control signal is output to control the heating unit to perform first-stage heating at a first heating power; When the temperature in the gasoline engine particulate trap unit reaches a first preset temperature, outputting a fourth control signal to control the heating unit to perform second-stage heating at a second heating power; When the pressure difference is greater than or equal to a first preset pressure difference, outputting a first control signal to control the heating unit to heat the gasoline engine particulate trap unit includes: During the second stage heating process and when the pressure difference is greater than or equal to the first preset pressure difference, outputting a first control signal to control the heating unit to perform third stage heating at a third heating power; When the pressure difference is less than a second preset pressure difference, outputting a second control signal to control the heating unit to stop heating the gasoline engine particulate capture unit includes: When the temperature in the gasoline engine particulate capture unit reaches a second preset temperature, a fifth control signal is output to control the heating unit to perform fourth stage heating at a fourth heating power until the pressure difference is less than the second preset pressure difference, and then a second control signal is output to control the heating unit to stop heating the gasoline engine particulate capture unit; the second preset pressure difference is less than the first preset pressure difference; the second heating power is less than the first heating power, the third heating power is equal to the first heating power, the fourth heating power is less than the second heating power, and the second preset temperature is greater than the first preset temperature.

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