阅读说明：本技术 一种耦合双极荷电凝并系统的gpf氧泵辅助再生装置与方法 (GPF oxygen pump auxiliary regeneration device and method of coupled bipolar charge coagulation system ) 是由 汤东 韩宇彬 徐国梁 刘胜 雎志轩 于 2020-06-08 设计创作，主要内容包括：本发明提供了一种耦合双极荷电凝并系统的GPF氧泵辅助再生装置与方法,所述装置包括汽油机颗粒捕集器、荷电装置、电凝并装置和氧泵再生装置,氧泵再生装置中设有氧泵电解质片与电热丝；荷电装置对汽油机尾气中的颗粒物进行预荷电,电凝并装置使颗粒物进行碰撞凝并,电热丝对颗粒物进行加热,加热的同时氧泵电解质片进行补氧工作；还可通过步进电机改变过滤体的旋转速率,达到调节再生效率的目的。本发明可以同时兼顾颗粒物的捕集效率与再生效率,对颗粒捕集器无损坏,同时不浪费资源。(The invention provides a GPF oxygen pump auxiliary regeneration device and method of a coupling bipolar charge coagulation system, wherein the device comprises a gasoline engine particle trap, a charging device, an electric coagulation device and an oxygen pump regeneration device, and an oxygen pump electrolyte sheet and an electric heating wire are arranged in the oxygen pump regeneration device; the charging device carries out pre-charging on the particulate matters in the tail gas of the gasoline engine, the electric coagulation device leads the particulate matters to be collided and coagulated, the electric heating wire heats the particulate matters, and the oxygen pump electrolyte sheet carries out oxygen supplement work while heating; the rotation rate of the filter body can be changed through the stepping motor, and the aim of adjusting the regeneration efficiency is achieved. The invention can simultaneously give consideration to the trapping efficiency and the regeneration efficiency of the particulate matters, has no damage to the particulate trap and does not waste resources.)

1. A GPF oxygen pump auxiliary regeneration device of a coupling bipolar charge coalescence system is characterized by comprising a gasoline engine particle trap (3), a charging device, an electric coagulation device and an oxygen pump regeneration device;

the charging device comprises a stainless steel wire (13) and a heating coil (12), the stainless steel wire (13) is supported inside a cylindrical shell (19), and one end of the stainless steel wire (13) is connected with a high-voltage direct-current power supply (6); the heating coil (12) is wound outside the cylindrical shell (19); one end of the cylindrical shell (19) is communicated with the exhaust end of the gasoline engine particle catcher (3), and the other end of the cylindrical shell is communicated with the gasoline engine;

the electric coagulation device comprises a shell (20) and a high-voltage alternating-current power supply (4), wherein the shell (20) is arranged at two ends of the gasoline engine particle catcher (3), and the shell (20) is connected with the high-voltage alternating-current power supply (4);

the oxygen pump regeneration device comprises an oxygen sensor (2), a particulate matter sensor (10), a high-frequency ceramic body (21), a filter body (22), an electric heating wire (16) and an oxygen pump electrolyte sheet (18); the oxygen sensor (2) is arranged at the air inlet end of the gasoline engine particle trap (3), the middle shaft of the gasoline engine particle trap (3) is fixedly provided with a filter body (22), a high-frequency ceramic body (21) is filled between the top filter body (22) and the shell of the gasoline engine particle trap (3), an electric heating wire (16) is arranged in the high-frequency ceramic body (21) in a penetrating way, the electric heating wire (16) wraps one end of an oxygen pump electrolyte sheet (18), the other end of the oxygen pump electrolyte sheet (18) penetrates through an oxygen guide pipe (17) and is connected with an oxygen pump power supply (15), and the oxygen guide pipe (17) is communicated with the air inlet end cavity of the gasoline engine particle trap (; the air inlet end and the air outlet end of the gasoline engine particle catcher (3) are both provided with a particle sensor (10);

the high-voltage direct current power supply (6), the oxygen pump power supply (15), the oxygen sensor (2) and the particle sensor (10) are all connected with the ECU.

2. The GPF oxygen pump auxiliary regeneration device coupled with the bipolar charge coagulation system is characterized by further comprising a fuel meter (9) and a power meter (1), wherein the fuel meter (9) is used for acquiring the fuel consumption condition of a gasoline engine, the power meter (1) is used for acquiring the power of the whole device, the gasoline engine working condition is determined according to the fuel consumption condition and the power of the device, and the oxygen concentration under different working conditions is determined by comparing with the working condition in an ECU (electronic control Unit).

3. The GPF oxygen pump auxiliary regeneration device coupled with the bipolar charge coagulation system is characterized by further comprising a stepping motor (5) connected with an intermediate shaft of the gasoline engine particle trap (3), wherein the stepping motor (5) is connected with an ECU (electronic control unit) and is used for driving the filter body (22) to rotate.

4. The GPF oxygen pump auxiliary regeneration device coupled with the bipolar charge coagulation system is characterized by further comprising a flow sensor (8) and a bypass valve (11), wherein the flow sensor (8) is used for flow of tail gas of a gasoline engine and transmitting the flow to an ECU, and the ECU controls the bypass valve (11) to be opened when the flow of the tail gas of the gasoline engine is larger than a set threshold value.

5. The GPF oxygen pump assisted regeneration device of a coupled bipolar charge coagulation system according to claim 1, characterized in that the heating coil (12) is connected with a first heating power supply (7).

6. The GPF oxygen pump assisted regeneration device of a coupled bipolar charged coagulation system according to claim 1, characterized in that the heating wire (16) is connected with a second heating power supply (14).

7. The GPF oxygen pump auxiliary regeneration method of the coupled bipolar charge coagulation system according to any one of claims 1 to 6, is characterized by comprising the following steps:

the method comprises the following steps that a particulate matter sensor (10) obtains the deposition condition of particulate matters in a gasoline engine particulate trap (3) in real time, and when an ECU detects that the trapping efficiency of the particulate trap begins to decrease, an electric heating wire (16) is controlled to work to heat the particulate matters; in the combustion process of the particulate matters, the oxygen sensor (2) acquires the oxygen concentration of the tail gas of the gasoline engine under different working conditions in real time, and when the oxygen concentration is smaller than a set value, the oxygen pump electrolyte sheet (18) works to generate high-temperature oxygen which is regenerated together with the particulate matters in the filter body (22).

8. The GPF oxygen pump auxiliary regeneration method of the coupled bipolar charged coagulation system is characterized in that during regeneration, a particulate matter sensor (10) acquires the deposition condition of particulate matters inside a gasoline engine particle trap (3) in real time, and the rotation rate of a stepping motor (5) is adjusted by the trapping efficiency, so that the rotation rate of a filter body (22) is adjusted.

9. The GPF oxygen pump assisted regeneration method of a coupled bipolar charged coagulation system according to claim 7, characterized in that when the trapping efficiency is stable over a longer period of time, the heating wire (16) and oxygen pump electrolyte sheet (18) are turned off.

Technical Field

The invention belongs to the technical field of exhaust particulate matter regeneration, and particularly relates to a gasoline engine particulate filter (GPF) oxygen pump auxiliary regeneration device and method coupled with a bipolar charge coagulation system.

Background

The particulate matters are used as main influence factors of air pollution, so that the atmospheric pollution has great harm to human health, the limit of environmental protection regulations on the atmospheric pollution is increasingly strict, the six regulations in China increase the limit requirements on the particulate matter quantity and the particulate number of gasoline vehicles, and the test working condition is changed from a New European Driving Cycle (NEDC) to a global unified light vehicle test cycle (WLTC). Research shows that the particle number of the direct injection gasoline engine in the cylinder is higher than that of the air inlet injection gasoline engine, and the particle mass and the particle number ratio NEDC of the corresponding WLTC are greatly increased. Particle count has become a significant challenge in the design and development of direct injection gasoline vehicles, and one of the possible solutions is to add a gasoline particulate trap (GPF) to the vehicle. Research shows that GPF can effectively reduce the particle number of direct injection gasoline vehicles in cylinder, so that the particle number is lower than the regulation limit value, but the GPF faces the regeneration problem.

The traditional particle trap needs to reduce the pore diameter, the porosity and the like for improving the trapping efficiency of fine particles, which inevitably leads to the rising of exhaust back pressure of the gasoline engine and the increase of power loss, thereby leading to the performance reduction of the gasoline engine. With the increasingly strict emission regulations, research aiming at controlling the amount of micro-nano particles is increasingly important. The GPF carrier with the same structure parameters has higher trapping efficiency on the accumulation-state particles than the core-mode particles with smaller particle size. The bipolar charge coalescence technology increases the coalescence coefficient among particles through particle charging, so that particles with small particle sizes are coalesced into particles with large particle sizes, and the capture efficiency of GPF is improved. After the particle catcher works for a period of time, the exhaust back pressure is increased due to the increase of deposited particles, and further the filter body of the particle catcher is invalid and the fuel economy is reduced. For this case, the particle trap needs to be regenerated. The problem has two solutions, one is to reduce the temperature required by the oxidation of the particles in the running process of the engine, and the other is to make the deposited particles reach the oxidation temperature through an auxiliary system. The first approach is used for passive regeneration systems and the second is used for active regeneration systems. Generally, active regeneration consumes about 2% -3% of the fuel, while passive regeneration can reduce by about 80%. According to the structure and the material of the GPF, the use characteristics and the use working condition of the gasoline engine, the reasonable selection of the regeneration technology has important significance for the safe and effective regeneration of the GPF.

The existing GPF trapping and regeneration technology filters and traps particulate matters through a filter body, the trapping efficiency is continuously reduced due to the fact that the particulate matters are accumulated to a certain degree, the particulate matters are cleared through the regeneration technology, and the existing GPF trapping and regeneration technology has the defect that the trapping efficiency and the regeneration efficiency are not high enough, so that the trapping device is damaged and resources are wasted.

Disclosure of Invention

Aiming at the defects in the prior art, the invention provides a GPF oxygen pump auxiliary regeneration device and method for a coupled bipolar charge coagulation system, and the GPF oxygen pump auxiliary regeneration device and method can improve the capture efficiency and the regeneration efficiency of GPF.

The present invention achieves the above-described object by the following technical means.

A GPF oxygen pump auxiliary regeneration device coupled with a bipolar charge coagulation system comprises a gasoline engine particle trap, a charging device, an electric coagulation device and an oxygen pump regeneration device;

the charging device comprises a stainless steel wire and a heating coil, the stainless steel wire is supported in the cylindrical shell, and one end of the stainless steel wire is connected with a high-voltage direct-current power supply; the heating coil is wound outside the cylindrical shell; one end of the cylindrical shell is communicated with the exhaust end of the gasoline engine particle catcher, and the other end of the cylindrical shell is communicated with the gasoline engine;

the electrocoagulation device comprises a shell and a high-voltage alternating-current power supply, wherein the shell is arranged at two ends of the gasoline engine particle catcher and is connected with the high-voltage alternating-current power supply;

the oxygen pump regeneration device comprises an oxygen sensor, a particulate matter sensor, a high-frequency ceramic body, a filter body, an electric heating wire and an oxygen pump electrolyte sheet; the oxygen sensor is arranged at the air inlet end of the gasoline engine particle trap, the middle shaft of the gasoline engine particle trap is fixedly provided with a filter body, a high-frequency ceramic body is filled between the top filter body and the shell of the gasoline engine particle trap, an electric heating wire penetrates through the high-frequency ceramic body and wraps one end of an oxygen pump electrolyte sheet, the other end of the oxygen pump electrolyte sheet penetrates through an oxygen guide pipe and is connected with an oxygen pump power supply, and the oxygen guide pipe is communicated with a cavity at the air inlet end of the gasoline engine particle trap; the air inlet end and the air outlet end of the gasoline engine particle catcher are both provided with a particle sensor;

and the high-voltage direct current power supply, the oxygen pump power supply, the oxygen sensor and the particle sensor are all connected with the ECU.

Among the above-mentioned technical scheme, still include fuel measurement appearance and power meter, the fuel measurement appearance is used for acquireing the fuel consumption condition of gasoline engine, and the power meter is used for acquireing the power of whole device, confirms the gasoline engine operating mode by the power of fuel consumption condition and device to compare with the operating mode among the ECU, confirm the oxygen concentration under the different operating modes.

In the technical scheme, the gasoline engine particle catcher further comprises a stepping motor connected with the middle shaft of the gasoline engine particle catcher, and the stepping motor is connected with the ECU and used for driving the filtering body to rotate.

In the technical scheme, the device further comprises a flow sensor and a bypass valve, wherein the flow sensor is used for the flow of the tail gas of the gasoline engine and transmitting the flow to the ECU, and when the flow of the tail gas of the gasoline engine is larger than a set threshold value, the ECU controls the bypass valve to be opened.

In the above technical solution, the heating coil is connected to a first heating power supply.

In the above technical scheme, the heating wire is connected with a second heating power supply.

A GPF oxygen pump auxiliary regeneration method of a coupled bipolar charge coagulation system comprises the following steps:

the method comprises the following steps that a particulate matter sensor acquires the deposition condition of particulate matters in a gasoline engine particulate trap in real time, and when an ECU detects that the trapping efficiency of the particulate trap begins to decrease, an electric heating wire is controlled to work to heat the particulate matters; in the combustion process of the particulate matters, the oxygen sensor acquires the oxygen concentration of the tail gas of the gasoline engine under different working conditions in real time, and when the oxygen concentration is smaller than a set value, the oxygen pump electrolyte sheet works to generate high-temperature oxygen which is regenerated together with the particulate matters in the filter body.

Furthermore, in the regeneration process, the particulate matter sensor acquires the particulate matter deposition condition in the gasoline engine particulate trap in real time, and the rotation rate of the stepping motor is adjusted by the trapping efficiency, so that the rotation rate of the filter body is adjusted.

Further, when the trapping efficiency is stable for a long time, the heating wire and the oxygen pump electrolyte sheet are turned off.

The invention has the beneficial effects that:

(1) according to the invention, the charging device is used for pre-charging the particulate matters in the gasoline engine tail gas, and then the electric coagulation device is used for carrying out collision coagulation on the particulate matters, so that the particle size is increased, and the trapping efficiency is improved.

(2) The invention combines the oxygen pump electrolyte sheet with the electric heating wire, and performs oxygen supplementation work while heating exhaust particles, thereby improving the exhaust oxygen concentration and better finishing the regeneration process.

(3) The invention utilizes the hollow filter body and connects the hollow filter body with the stepping motor, so that gas flows in from the radial direction and flows out from the axial direction, the charged coagulation process and the oxygen pump regeneration process can be simultaneously carried out, and meanwhile, the rotation rate of the stepping motor is regulated by the trapping efficiency according to the deposition condition of particulate matters in the gasoline engine particle trap, thereby changing the rotation rate of the filter body and achieving the purpose of regulating the regeneration efficiency.

Drawings

Fig. 1 is a schematic structural diagram of a GPF oxygen pump auxiliary regeneration device of the coupled bipolar charge coagulation system of the present invention;

FIG. 2 is a schematic structural view of a gasoline engine particulate trap according to the present invention, FIG. 2(a) is a front view of the gasoline engine particulate trap according to the present invention, and FIG. 2(b) is a side view of the gasoline engine particulate trap according to the present invention;

the device comprises a power meter 1, an oxygen sensor 2, a gasoline engine particle trap 3, a high-voltage alternating current power supply 4, a stepping motor 5, a high-voltage direct current power supply 6, a first heating power supply 7, a flow sensor 8, a fuel oil meter 9, a particulate matter sensor 10, a bypass valve 11, a ceramic heating coil 12, a stainless steel wire 13, a second heating power supply 14, an oxygen pump power supply 15, an electric heating wire 16, an oxygen guide pipe 17, an oxygen pump electrolyte sheet 18, a cylindrical shell 19, a shell 20, a high-frequency ceramic body 21 and a filter 22.

Detailed Description

The invention will be further described with reference to the following figures and specific examples, but the scope of the invention is not limited thereto.

As shown in fig. 1, a GPF oxygen pump auxiliary regeneration device coupled with a bipolar charge coagulation system comprises a gasoline engine particle trap 3, a charging device, an electric coagulation device and an oxygen pump regeneration device.

The charging device consists of a cylindrical shell 19, a stainless steel wire 13, a heating coil 12, a high-voltage direct-current power supply 6 and a first heating power supply 7; one end of the cylinder shell 19 is communicated with the exhaust end of the gasoline engine particle catcher 3, and the other end is communicated with the gasoline engine; the stainless steel wire 13 is supported in the center of the inside of the cylindrical shell 19, one end of the stainless steel wire 13 is connected with the high-voltage direct-current power supply 6, and the high-voltage direct-current power supply 6 is connected with the cylindrical shell 19; a heating coil 12 is wound outside the cylindrical case 19, and the heating coil 12 is connected to the first heating power supply 7. The cylindrical shell 19 is made of stainless steel, and the heating coil 12 is made of ceramic. The cylindrical shell 19 is grounded.

The electric coagulation device consists of a shell 20 and a high-voltage alternating-current power supply 4, wherein the shell 20 is connected with the high-voltage alternating-current power supply 4 through a lead; the shell 20 is arranged at two ends of the gasoline engine particle catcher 3, the shell 20 is made of stainless steel materials, and the shell 20 is wrapped by insulating materials.

As shown in fig. 2(a) and (b), the oxygen pump regeneration device is composed of an oxygen pump power supply 15, a second heating power supply 14, an oxygen sensor 2, a particulate matter sensor 10, a flow sensor 8, a stepping motor 5, a fuel meter 9, a power meter 1, a bypass valve 11, a high-frequency ceramic body 21, a filter body 22, a heating wire 16, an oxygen pump electrolyte sheet 18, and an oxygen conduit 17. Wherein the oxygen sensor 2 and the power meter 1 are arranged at the air inlet end of the gasoline engine particle catcher 3; a filter body 22 is fixed on a middle shaft of the gasoline engine particle catcher 3, a high-frequency ceramic body 21 is filled between the top filter body 22 and the shell of the gasoline engine particle catcher 3, and the filter body 22 is in a hollow cylinder shape; the heating wire 16 is arranged in the high-frequency ceramic body 21 in a penetrating way, and the heating wire 16 is connected with the second heating power supply 14; one end of an oxygen pump electrolyte sheet 18 is wrapped in the heating wire 16, the other end of the oxygen pump electrolyte sheet 18 penetrates through an oxygen guide pipe 17 and is connected with an oxygen pump power supply 15, and the oxygen guide pipe 17 is communicated with a gas inlet end cavity of the gasoline engine particle trap 3; the air inlet end and the air outlet end of the gasoline engine particle catcher 3 are respectively connected with a particle sensor 10; the middle shaft of the gasoline engine particle catcher 3 is connected with the output shaft of the stepping motor 5, so as to drive the filter 22 to rotate; the bypass valve 11 is positioned at the exhaust end of the gasoline engine particle catcher 3, the flow sensor 8 is arranged on a cylinder shell 19 close to the gasoline engine, and the gasoline engine is also provided with a fuel metering instrument 9.

The high-voltage direct-current power supply 6, the high-voltage alternating-current power supply 4, the oxygen pump power supply 15, the first heating power supply 7, the second heating power supply 14, the oxygen sensor 2, the particulate matter sensor 10, the flow sensor 8, the stepping motor 5, the bypass valve 11, the fuel meter 9 and the power meter 1 are all connected with the ECU.

In this embodiment, the stainless steel wire 13 has a length of 500mm and a diameter of 1.5 mm; the tail gas discharged by the gasoline engine flows in along the radial direction and is discharged along the axial direction.

The fuel metering instrument 9 is used for obtaining the fuel consumption condition of the gasoline engine, the power meter 1 is used for obtaining the power of the whole device, the working condition of the gasoline engine is determined according to the fuel consumption condition and the power of the device, and the working condition is compared with the working condition stored in the ECU to determine the oxygen concentration under different working conditions; this process is performed prior to active regeneration. The flow sensor 8 is used for the flow of the tail gas of the gasoline engine and transmitting the flow to the ECU, and when the flow of the tail gas of the gasoline engine is overlarge (an exhaust flow threshold value is arranged in the ECU), the ECU controls the bypass valve 11 to be opened.

The method for carrying out charged coagulation and trapping particulate matters by using the gasoline engine particulate trap comprises the following steps: the stainless steel wire 13 through connecting high voltage direct current power supply 6 carries out the precharge to the particulate matter in the gasoline engine tail gas to tail gas after the precharge is heated through heating coil 12, discharges unnecessary vapor, and tail gas gets into the coagulation electric field on 3 upper portions of gasoline engine particle trap, and the relative motion between the coagulation electric field reinforcing particulate matter promotes collision and condensation between the particulate matter, accomplishes the entrapment process.

The active regeneration method of the gasoline engine particle catcher active regeneration device comprises the following steps: the method comprises the steps that the deposition condition of particulate matters in a gasoline engine particulate trap 3 is obtained in real time by a particulate matter sensor 10 and is transmitted to an ECU (electronic control Unit), when the ECU detects that the trapping efficiency of the particulate trap begins to decrease, the ECU enables an electric heating wire 16 to work by controlling a second heating power supply 14, the electric heating wire 16 and a high-frequency ceramic body 21 heat a filter body 22, the ignition temperature of the deposited particulate matters is reached, and the particulate matters begin to burn; in the combustion process, the oxygen sensor 2 is used for acquiring the oxygen concentration of the tail gas of the gasoline engine under different working conditions in real time, the exhaust oxygen concentration data is fed back to the ECU, when the oxygen concentration is insufficient (smaller than a set value in the ECU), the ECU controls the oxygen pump power supply 15 to supply power to the oxygen pump electrolyte sheet 18, the oxygen pump electrolyte sheet 18 works to generate high-temperature oxygen, the high-temperature oxygen enters the gasoline engine particle trap 3 through the oxygen guide pipe 17, the oxygen concentration of the regeneration air flow is improved, and the regeneration air flow and the particulate matters are regenerated in the filter 22; in the regeneration process, the particulate matter sensor 10 acquires the particulate matter deposition condition inside the gasoline engine particulate trap 3 in real time, the capture efficiency regulates the rotation rate of the stepping motor 5, and the rotation rate of the stepping motor 5 is regulated by the ECU, so that the rotation rate of the filter body 22 is changed, and the purpose of regulating the regeneration efficiency is achieved; when the trapping efficiency is stable for a long period of time, the ECU turns off the second heating power supply 14 and the oxygen pump power supply 15, and the heating wire 16 and the oxygen pump electrolyte sheet 18 stop operating.

In the above process, the deposition condition of the particulate matter and the rotation rate of the stepping motor 5 are determined in advance through a calibration test and stored in the ECU.

The present invention is not limited to the above-described embodiments, and any obvious improvements, substitutions or modifications can be made by those skilled in the art without departing from the spirit of the present invention.