Detection circuit for detecting whether combustor is successfully ignited

Abstract

A detection circuit for detecting whether a combustor is successfully ignited comprises a combustor controller, an ignition coil, a first spark plug, a second spark plug, a first ignition high-voltage wire and a second ignition high-voltage wire. And the first ignition high-voltage wire is connected with the ignition coil and the first ignition electrode. And the first ignition high-voltage wire transmits a high-voltage pulse signal to the first ignition electrode. And the second ignition high-voltage wire is connected with the ignition coil and the second ignition electrode. And the second ignition high-voltage wire transmits a high-voltage pulse signal to the second ignition electrode. The first ignition electrode and the second ignition electrode are used for enabling high voltage difference between the first ignition electrode and the second ignition electrode to break down gas to form sparks, and fuel oil is ignited by the sparks to form flames.

Description

Technical Field

[0001] The utility model relates to a detection circuit for detecting whether a burner is ignited successfully, belonging to the technical field of engine exhaust post-processing. Background Art

[0002] With the continuous upgrading of emission regulations, how to quickly increase the exhaust temperature during engine cold start to shorten the time to reach the operating temperature of the aftertreatment substrate and / or perform thermal management is a technical problem faced by technicians in the relevant technical field.

[0003] To this end, a solution of adding a burner to the exhaust gas after-treatment system has been proposed in the related art. However, there is still room for improvement in the detection circuit for detecting whether the burner has been successfully ignited. Utility Model Content

[0004] The purpose of the utility model is to provide a detection circuit with an improved solution for detecting whether a burner is ignited successfully.

[0005] To achieve the above object, the present invention adopts the following technical solution: a detection circuit for detecting whether a burner is successfully ignited, the burner including a housing, the detection circuit including:

[0006] Burner controller;

[0007] ignition coil;

[0008] a first spark plug, the first spark plug comprising a first ignition electrode;

[0009] a second spark plug, the second spark plug comprising a second ignition electrode;

[0010] a first ignition high-voltage wire, connecting the ignition coil and the first ignition electrode; the first ignition high-voltage wire transmits a high-voltage pulse signal to the first ignition electrode;

[0011] a second ignition high-voltage wire, the second ignition high-voltage wire connecting the ignition coil and the second ignition electrode; the second ignition high-voltage wire transmitting a high-voltage pulse signal to the second ignition electrode;

[0012] The first ignition electrode and the second ignition electrode are used to generate a high voltage difference between the first ignition electrode and the second ignition electrode to break down the gas and form a spark, and the fuel is ignited by the spark to form a flame;

[0013] If the first ignition electrode, the second ignition electrode, and the shell of the burner form a loop to generate a current signal, it is determined that the ignition is successful; otherwise, it is determined that the ignition is unsuccessful.

[0014] As a further improved technical solution of the present invention, the housing includes an inner cavity for allowing exhaust gas to circulate, and the burner further includes:

[0015] A combustion chamber assembly, the combustion chamber assembly being mounted on the housing, the combustion chamber assembly comprising:

[0016] a barrel portion, the barrel portion comprising a circumferential wall and a combustion chamber surrounded by the circumferential wall, the combustion chamber being in communication with the inner cavity;

[0017] A mounting seat, the mounting seat being fixed to the cylindrical portion, the mounting seat comprising an air intake passage, a first wall portion, a second wall portion, and a mounting cylindrical portion;

[0018] a first spark plug, the first spark plug being mounted on the first wall portion and protruding into the combustion chamber;

[0019] a second spark plug, the second spark plug being mounted on the second wall portion and protruding into the combustion chamber; and

[0020] a diesel nozzle assembly, the diesel nozzle assembly being mounted on the mounting barrel portion and being used to inject diesel into the combustion chamber;

[0021] In which, the diesel nozzle assembly includes a valve needle, a first swirl assembly located at the bottom of the valve needle, and a sleeve portion located at least partially below the first swirl assembly. The first swirl assembly includes an inlet hole and a shut-off nozzle hole. The sleeve portion is provided with a mixing chamber connected to the shut-off nozzle hole. The mixing chamber is used to mix diesel and air, and the mixing chamber is connected to the combustion chamber.

[0022] As a further improved technical solution of the present invention, the housing includes an inner cavity for allowing exhaust gas to circulate, and the burner further includes:

[0023] A combustion chamber assembly, the combustion chamber assembly being mounted on the housing, the combustion chamber assembly comprising:

[0024] a cylindrical portion, the cylindrical portion comprising a circumferential wall, a combustion chamber surrounded by the circumferential wall, and an opening at the bottom of the cylindrical portion, the opening communicating with the combustion chamber and the inner cavity;

[0025] a mounting base, the mounting base being fixed to the cylindrical portion, the mounting base comprising an air intake passage, a first wall portion, a first air hole penetrating the first wall portion and communicating with the air intake passage, a second wall portion, and a second air hole penetrating the second wall portion and communicating with the air intake passage;

[0026] a first spark plug, the first spark plug being mounted on the first wall portion and protruding into the combustion chamber;

[0027] a second spark plug, the second spark plug being mounted on the second wall portion and protruding into the combustion chamber; and

[0028] a diesel nozzle assembly, the diesel nozzle assembly being mounted on the mounting seat and being used to inject diesel into the combustion chamber;

[0029] Wherein, a first airflow purge channel is further provided between the first spark plug and the first wall portion, and the first air hole communicates with the air intake channel and the first airflow purge channel to purge the first spark plug with a portion of air;

[0030] A second airflow purge channel is further provided between the second spark plug and the second wall portion, and the second air hole communicates with the air intake channel and the second airflow purge channel to purge the second spark plug with a portion of air.

[0031] As a further improved technical solution of the present invention, the housing is provided with a raised mounting portion;

[0032] The mounting seat includes a mounting plate and a mounting convex portion integrally formed with the mounting plate; the mounting plate is mounted and fixed to the mounting portion, and the mounting convex portion protrudes from the mounting plate;

[0033] The first airflow purge channel and the second airflow purge channel are both annular and pass through the mounting plate.

[0034] As a further improved technical solution of the present invention, the diesel nozzle assembly includes a valve needle, a first swirl assembly located at the bottom of the valve needle, a sleeve portion at least partially located below the first swirl assembly, and a second swirl assembly cooperating with the sleeve portion, the first swirl assembly including an inlet hole and a shutoff nozzle hole, the sleeve portion is provided with a mixing chamber connected to the shutoff nozzle hole, and the mixing chamber is connected to the combustion chamber;

[0035] The combustion chamber assembly includes an annular airflow channel located between the mounting seat and the diesel nozzle assembly, the annular airflow channel is connected to the air intake channel, the sleeve portion includes a first opening connecting the annular airflow channel and the mixing chamber, and the second swirl assembly includes a second connecting port connecting the annular airflow channel and the combustion chamber.

[0036] As a further improved technical solution of the present invention, the ignition coil includes a primary coil, a secondary coil and an iron core, wherein the primary coil controls the battery to charge the primary coil through a switch, the secondary coil increases the low voltage of the primary coil to a high voltage, and the iron core is used to enhance the magnetic field and electromagnetic induction effects.

[0037] Compared with the prior art, the detection circuit of the present invention determines whether the ignition is successful by judging whether the first ignition electrode, the second ignition electrode and the shell of the burner are connected into a loop after ignition to generate a current signal, and the judgment time for successful ignition is shorter. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] Figure 1 It is a three-dimensional schematic diagram of a burner of the present invention in one embodiment;

[0039] Figure 2 yes Figure 1 Left view of;

[0040] Figure 3 yes Figure 1 The main view;

[0041] Figure 4 It is along Figure 2 Schematic diagram of the cross section along line AA;

[0042] Figure 5 It is along Figure 2 Schematic cross-section of the middle BB line;

[0043] Figure 6 It is along Figure 1 Schematic cross-section of the mid-CC line;

[0044] Figure 7 It is a three-dimensional schematic diagram of the combustion chamber assembly of the burner of the utility model;

[0045] Figure 8 yes Figure 7 The main view;

[0046] Figure 9 It is along Figure 8 Schematic cross-section of the middle DD line;

[0047] Figure 10 yes Figure 9 A partial enlarged view of the circled portion E;

[0048] Figure 11 It is along Figure 3 Schematic cross-section of the FF line;

[0049] Figure 12 It is a schematic diagram of a detection circuit for detecting whether a burner is ignited successfully in the present invention. DETAILED DESCRIPTION

[0050] The following will describe the specific embodiments of the present invention in detail with reference to the accompanying drawings. If there are several specific embodiments, the features of these embodiments can be combined with each other without conflict. When the description refers to the drawings, unless otherwise specified, the same numbers or symbols in different drawings represent the same or similar elements. The contents described in the following exemplary embodiments do not represent all embodiments of the present invention. On the contrary, they are only examples of products that are consistent with the present invention and are described in the claims of the present invention.

[0051] The terms used in this utility model are for the purpose of describing specific embodiments only and are not intended to limit the scope of protection of this utility model. It should be understood that the terms "first", "second" and similar terms used in the specification and claims of this utility model do not indicate any order, quantity or importance, but are merely used to distinguish features.

[0052] Please refer to Figures 1 to 10 As shown, the present invention discloses a burner 100 for use in a diesel engine exhaust aftertreatment system to rapidly increase exhaust gas temperature and / or perform thermal management. Those skilled in the art will appreciate that, in one embodiment, the diesel engine exhaust aftertreatment system includes a diesel oxidation catalyst (DOC), a diesel particulate filter (DPF), and a selective catalytic reduction (SCR). The burner includes a housing 1 and a combustion chamber assembly 2 mounted on the housing 1.

[0053] In one embodiment of the present invention, the housing 1 is made of a metal material and includes a first half-housing 11, a second half-housing 12, a first flange 13 fixed to one end of the first half-housing 11 and the second half-housing 12, and a second flange 14 fixed to the other end of the first half-housing 11 and the second half-housing 12. The first flange 13 and the second flange 14 enable the burner 100 to be detachably connected to the diesel engine exhaust after-treatment system.

[0054] The housing 1 is provided with an inner cavity 10 to allow exhaust gas to flow through. In the illustrated embodiment of the present invention, the inner cavity 10 is formed by the first half-housing 11 and the second half-housing 12. Of course, those skilled in the art will appreciate that in other embodiments of the present invention, the housing 1 may also be a one-piece housing. In one embodiment of the present invention, the first half-housing 11 and the second half-housing 12 are welded to each other. The first flange 13 is welded to one end of the first half-housing 11 and the second half-housing 12, and the second flange 14 is welded to the other end of the first half-housing 11 and the second half-housing 12.

[0055] In addition, in the illustrated embodiment of the present invention, the housing 1 is provided with a raised mounting portion 15 , and the axis of the mounting portion 15 forms an angle less than 90° (eg, an angle of 45°) with the axis of the inner cavity 10 .

[0056] The combustion chamber assembly 2 is mounted on the mounting portion 15 and at least partially protrudes into the inner cavity 10. In addition, the housing 1 is further provided with a raised portion 16 protruding toward the mounting portion 15. The raised portion 16 is used to direct a portion of the exhaust gas toward the combustion chamber assembly 2 to dissipate heat from the combustion chamber assembly 2 to a certain extent.

[0057] In the illustrated embodiment of the present invention, the combustion chamber assembly 2 includes a cylinder portion 21, a mounting base 22 fixed to the cylinder portion 21, a first spark plug 23 mounted on the mounting base 22, a second spark plug 24 mounted on the mounting base 22, and a diesel nozzle assembly 25 mounted on the mounting base 22.

[0058] In the illustrated embodiment of the present invention, the barrel portion 21 is made of metal and protrudes into the inner cavity 10. The barrel portion 21 includes a circumferential wall 211, a combustion chamber 212 surrounded by the circumferential wall 211, and an opening 213 at the bottom of the barrel portion 21, the opening 213 connecting the combustion chamber 212 with the inner cavity 10.

[0059] In the illustrated embodiment of the present invention, the mounting base 22 is made of metal, and the cylindrical portion 21 and the mounting base 22 are provided separately and assembled and fixed together. The mounting base 22 includes a mounting plate 221, a mounting cylindrical portion 222 integrally formed with the mounting plate 221, and a mounting protrusion 223 integrally formed with the mounting plate 221 and located adjacent to the mounting cylindrical portion 222. The mounting plate 221 is mounted and fixed to the mounting portion 15, and the mounting cylindrical portion 222 and the mounting protrusion 223 both protrude upward from the mounting plate 221.

[0060] The diesel nozzle assembly 25 is installed in the installation cylinder portion 222. The diesel nozzle assembly 25 includes a valve needle 251, a first swirl assembly 252 located at the bottom of the valve needle 251, a sleeve portion 253 at least partially located below the first swirl assembly 252, and a second swirl assembly 254 that cooperates with the sleeve portion 253.

[0061] In one embodiment of the present invention, the first swirl assembly 252 includes several swirl plates 2521 to form a swirl channel 2520. The top swirl plate 2521 of the first swirl assembly 252 is provided with an inlet hole 2522, and the bottom swirl plate 2521 is provided with a shutoff nozzle 2523. Each swirl plate 2521 is provided with a swirl groove. Diesel fuel enters the swirl channel 2520 through the inlet hole 2522 of the first swirl assembly 252 and is sprayed into the mixing chamber 2531 through the shutoff nozzle 2523 at a specific angle and initial velocity. The first swirl assembly 252 throttles the diesel fuel to a certain degree, thereby achieving better atomization of the diesel nozzle assembly 25 even at low flow rates. The shutoff nozzle improves the continuity of diesel injection at low power levels and significantly enhances the accuracy of fuel metering. Furthermore, at high power levels, diesel fuel fragmentation is accelerated, resulting in better atomization and faster ignition. The utility model greatly improves the adaptability of the diesel nozzle assembly 25 to different working conditions by providing the first swirl assembly 252 .

[0062] In the illustrated embodiment of the present invention, the combustion chamber assembly 2 includes an annular airflow channel 255 located between the mounting cylinder portion 222 and the diesel nozzle assembly 25 .

[0063] The sleeve portion 253 includes a mixing cavity 2531 communicating with the swirl channel 2520 and a first opening 2530 communicating with the annular airflow channel 255. In the illustrated embodiment of the present invention, the sleeve portion 253 includes a hollow cylindrical portion 2533 and a hollow conical portion 2534 connected to the cylindrical portion 2533. The mixing cavity 2531 extends through the cylindrical portion 2533 and the conical portion 2534. The mixing cavity 2531 communicates with the combustion chamber 212. The second swirl assembly 254 is located outside the conical portion 2534. A conical airflow channel 256 is formed between the second swirl assembly 254 and the conical portion 2534. The conical airflow channel 256 communicates with the combustion chamber 212. The second swirl assembly 254 also includes a second connecting port 257 connecting the annular airflow channel 255 with the conical airflow channel 256.

[0064] In the illustrated embodiment of the present invention, the first spark plug 23 and the second spark plug 24 are mounted on the mounting convex portion 223 , and both the first spark plug 23 and the second spark plug 24 protrude into the combustion chamber 212 .

[0065] Specifically, the mounting bulge 223 is provided with an air intake channel 2230, a first wall portion 2231 for mounting the first spark plug 23, a first air hole 2232 penetrating the first wall portion 2231 and connected to the air intake channel 2230, a second wall portion 2233 for mounting the second spark plug 24, and a second air hole 2234 penetrating the second wall portion 2233 and connected to the air intake channel 2230.

[0066] In the illustrated embodiment of the present invention, a first airflow purge channel 2235 is further defined between the first spark plug 23 and the first wall portion 2231. The first airflow purge channel 2235 extends through the mounting plate 221 to communicate with the combustion chamber 212. Similarly, a second airflow purge channel 2236 is further defined between the second spark plug 24 and the second wall portion 2233. The second airflow purge channel 2236 extends through the mounting plate 221 to communicate with the combustion chamber 212. In the illustrated embodiment of the present invention, both the first airflow purge channel 2235 and the second airflow purge channel 2236 are annular in shape. The first air hole 2232 connects the air intake channel 2230 with the first airflow purge channel 2235, allowing a portion of air to purge the first spark plug 23 to prevent carbon deposits. The second air hole 2234 communicates with the air intake channel 2230 and the second air flow purge channel 2236 to use a portion of air to purge the second spark plug 24 to prevent carbon deposition.

[0067] The working principle of the burner 100 of the present utility model is as follows:

[0068] Air Path: Air flows from the air intake channel 2230 into the mounting convex portion 223. A portion of the airflow passes through the first air hole 2232 and enters the combustion chamber 212 through the first air purge channel 2235. A portion of the airflow passes through the second air hole 2234 and enters the combustion chamber 212 through the second air purge channel 2236. The majority of the airflow enters the annular airflow channel 255. The air entering the annular airflow channel 255 is divided into two paths: one path passes through the first connecting port 2532 and enters the mixing chamber 2531; the other path passes through the second connecting port 257 and enters the combustion chamber 212 through the tapered airflow channel 256.

[0069] Oil circuit: Diesel flows from the oil channel of the diesel nozzle assembly 25 to the first swirl assembly 252, and then flows into the mixing chamber 2531 through the swirl channel 2520. The diesel is atomized and mixed with the air passing through the first connecting port 2532 (first atomization). Another path of air passing through the second connecting port 257 forms a swirl and is atomized and mixed with the diesel again (second atomization), ultimately making the diesel entering the combustion chamber 212 have better ignition properties.

[0070] When the ignition conditions are met, the first spark plug 23 and the second spark plug 24 discharge to ignite the diesel. The combustion of the diesel will extremely quickly increase the temperature of the exhaust gas, so that the exhaust gas after-treatment carrier in the exhaust gas after-treatment system of the diesel engine quickly reaches the operating temperature, which is beneficial to shorten the time it takes for the exhaust gas after-treatment carrier to reach the operating temperature during a cold start of the diesel engine.

[0071] When the burner 100 is operating, the diesel concentration near the first spark plug 23, the second spark plug 24, and the top of the combustion chamber 212 is relatively high. This area is prone to producing soot due to incomplete combustion, which in turn causes carbon deposits on the first spark plug 23 and the second spark plug 24. Carbon deposits are extremely harmful. When the carbon deposits reach a certain level, the insulation between the first spark plug 23 and the second spark plug 24 and the mounting bulge 223 is lost, causing certain safety issues. In the present invention, by introducing air from the first air hole 2232 and the second air hole 2234 to purge the first spark plug 23 and the second spark plug 24 respectively, the diesel concentration in this area can be reduced, the air-to-fuel ratio can be increased, the combustion efficiency can be improved, and the generation of soot can be reduced. At the same time, due to the enhanced air flow, soot is not easily adsorbed on the surfaces of the first spark plug 23, the second spark plug 24, and the spark plug mounting holes, thereby reducing the risk of carbon deposits in this area.

[0072] In addition, the present invention also discloses a detection method for detecting whether the burner 100 is successfully ignited. The detection method adopts a detection circuit including a burner controller 31, an ignition coil 32, a first ignition high-voltage wire 321 connecting the ignition coil 32 and the first ignition electrode 231 of the first spark plug 23, and a second ignition high-voltage wire 322 connecting the ignition coil 32 and the second ignition electrode 241 of the second spark plug 24.

[0073] The burner controller 31 sends an ignition request signal and receives a flame detection signal.

[0074] The ignition coil 32 includes a primary coil, a secondary coil, and an iron core, wherein the primary coil is charged by a battery through switch control, the secondary coil increases the low voltage of the primary coil to a high voltage, and the iron core is used to enhance the magnetic field and electromagnetic induction effect.

[0075] The first ignition high-voltage line 321 transmits a high-voltage pulse signal to the first ignition electrode 231 , and the second ignition high-voltage line 322 transmits a high-voltage pulse signal to the second ignition electrode 241 .

[0076] The first ignition electrode 231 and the second ignition electrode 241 are used to generate a high voltage difference between the two electrodes to break down the gas and form a spark, which ignites the fuel and forms a flame 4 .

[0077] The detection method operates as follows: The burner controller 31 controls the charging and discharging of the primary coil. When the primary coil is powered, a strong magnetic field is generated around it as the current increases, and the iron core stores the magnetic field energy. When the switching device disconnects the primary coil circuit, the magnetic field rapidly decays, and a high voltage is induced in the secondary coil. This high-voltage pulse signal is transmitted to the first and second spark plugs 23 and 24 via the first and second ignition high-voltage wires 321 and 322. The resulting spark ignites the diesel-air mixture, producing flame 4. Diesel combustion generates a large number of charged positive and negative ions and electrons. These charged ions form a circuit between the first and second ignition electrodes 231 and 241, and the burner housing 100, generating a weak current signal. This current signal is amplified and converted into a pulse width signal, which is output to the burner controller 31. Specifically, in one embodiment of the present invention, these charged ions form a circuit between the first ignition electrode 231, the second ignition electrode 241, and the cylindrical portion 21 forming the combustion chamber 212, generating a weak current signal. This current signal is amplified and converted into a pulse width signal, which is output to the burner controller 31. The burner controller 31 determines whether there is a stable flame 4 based on the duty cycle of the pulse width signal, thereby determining whether ignition is successful.

[0078] The detection method comprises the following steps:

[0079] (a) The burner controller 31 sends an ignition request signal to the ignition coil 32;

[0080] (b) the ignition coil 32 transmits the high voltage pulse signal to the first spark plug 23 and the second spark plug 24 through the first ignition high voltage wire 321 and the second ignition high voltage wire 322;

[0081] (c) determining whether a current signal is generated by forming a loop between the first ignition electrode 231, the second ignition electrode 241, and the housing 1 of the burner 100;

[0082] (d) If yes, the ignition is judged to be successful; if not, the ignition is judged to be unsuccessful.

[0083] In step (c), the detection method includes determining whether a current signal is generated due to formation of a loop between the first ignition electrode 231 , the second ignition electrode 241 , and the barrel portion 21 forming the combustion chamber 212 .

[0084] Between step (c) and step (d), the detection method further comprises:

[0085] The current signal is amplified and converted into a pulse width signal, which is then output to the burner controller 31 .

[0086] In step (d), the burner controller 31 determines whether there is a stable flame 4 based on the duty cycle of the pulse width signal, thereby determining whether the ignition is successful.

[0087] The detection method of the utility model has the following beneficial effects:

[0088] (1) Due to the fast transmission speed of the electrical signal, the time required to determine whether the ignition is successful is short. Since a large amount of fuel injection and a low air-fuel ratio are required during ignition, although this is conducive to rapid ignition, the emission of hydrocarbons will be higher. The present invention uses ion signals to determine whether the ignition is successful. The burner controller 31 can adjust the air-fuel ratio in advance to ensure more complete combustion of the fuel.

[0089] (2) When the flame 4 is lost, the present invention can also make a quick judgment, thereby preventing the problem of excessive hydrocarbon emissions caused by excessive fuel injection.

[0090] (3) It is helpful to diagnose carbon deposits on the ignition electrode (for example, the first ignition electrode 231 and / or the second ignition electrode 241). When the ignition electrode is operated when no fuel injection is performed, it can be determined whether there is carbon deposit around the ignition electrode based on the feedback pulse width signal. When there is no flame 4 but the ion signal still exists, it means that a circuit may be formed between the ignition electrode and the cylindrical portion 21 forming the combustion chamber 212 due to carbon deposits.

[0091] The above embodiments are only used to illustrate the present invention and are not intended to limit the technical solutions described in the present invention. The understanding of this specification should be based on technical personnel in the relevant technical field. Although this specification has described the present invention in detail with reference to the above embodiments, ordinary technical personnel in the field should understand that technical personnel in the relevant technical field can still modify or replace the present invention with equivalents, and all technical solutions and improvements that do not depart from the spirit and scope of the present invention should be covered by the scope of the claims of the present invention.

Claims

1. A detection circuit for detecting whether a burner is ignited successfully, wherein the burner comprises a housing, characterized in that: The detection circuit comprises: Burner controller; ignition coil; a first spark plug, the first spark plug comprising a first ignition electrode; a second spark plug, the second spark plug comprising a second ignition electrode; a first ignition high-voltage wire, connecting the ignition coil and the first ignition electrode; the first ignition high-voltage wire transmits a high-voltage pulse signal to the first ignition electrode; a second ignition high-voltage wire, the second ignition high-voltage wire connecting the ignition coil and the second ignition electrode; the second ignition high-voltage wire transmitting a high-voltage pulse signal to the second ignition electrode; The first ignition electrode and the second ignition electrode are used to generate a high voltage difference between the first ignition electrode and the second ignition electrode to break down the gas and form a spark, and the fuel is ignited by the spark to form a flame; If the first ignition electrode, the second ignition electrode, and the shell of the burner form a loop to generate a current signal, it is determined that the ignition is successful; otherwise, it is determined that the ignition is unsuccessful.

2. The detection circuit according to claim 1, wherein: The housing includes an inner cavity for allowing exhaust gas to circulate, and the burner further includes: A combustion chamber assembly, the combustion chamber assembly being mounted on the housing, the combustion chamber assembly comprising: a barrel portion, the barrel portion comprising a circumferential wall and a combustion chamber surrounded by the circumferential wall, the combustion chamber being in communication with the inner cavity; A mounting seat, the mounting seat being fixed to the cylindrical portion, the mounting seat comprising an air intake passage, a first wall portion, a second wall portion, and a mounting cylindrical portion; a first spark plug, the first spark plug being mounted on the first wall portion and protruding into the combustion chamber; a second spark plug, the second spark plug being mounted on the second wall portion and protruding into the combustion chamber; and a diesel nozzle assembly, the diesel nozzle assembly being mounted on the mounting barrel portion and being used to inject diesel into the combustion chamber; In which, the diesel nozzle assembly includes a valve needle, a first swirl assembly located at the bottom of the valve needle, and a sleeve portion located at least partially below the first swirl assembly. The first swirl assembly includes an inlet hole and a shut-off nozzle hole. The sleeve portion is provided with a mixing chamber connected to the shut-off nozzle hole. The mixing chamber is used to mix diesel and air, and the mixing chamber is connected to the combustion chamber.

3. The detection circuit according to claim 1, wherein: The housing includes an inner cavity for allowing exhaust gas to circulate, and the burner further includes: A combustion chamber assembly, the combustion chamber assembly being mounted on the housing, the combustion chamber assembly comprising: a cylindrical portion, the cylindrical portion comprising a circumferential wall, a combustion chamber surrounded by the circumferential wall, and an opening at the bottom of the cylindrical portion, the opening communicating with the combustion chamber and the inner cavity; a mounting base, the mounting base being fixed to the cylindrical portion, the mounting base comprising an air intake passage, a first wall portion, a first air hole penetrating the first wall portion and communicating with the air intake passage, a second wall portion, and a second air hole penetrating the second wall portion and communicating with the air intake passage; a first spark plug, the first spark plug being mounted on the first wall portion and protruding into the combustion chamber; a second spark plug, the second spark plug being mounted on the second wall portion and protruding into the combustion chamber; and a diesel nozzle assembly, the diesel nozzle assembly being mounted on the mounting seat and being used to inject diesel into the combustion chamber; Wherein, a first airflow purge channel is further provided between the first spark plug and the first wall portion, and the first air hole communicates with the air intake channel and the first airflow purge channel to purge the first spark plug with a portion of air; A second airflow purge channel is further provided between the second spark plug and the second wall portion, and the second air hole communicates with the air intake channel and the second airflow purge channel to purge the second spark plug with a portion of air.

4. The detection circuit according to claim 3, wherein: The housing is provided with a raised mounting portion; The mounting seat includes a mounting plate and a mounting convex portion integrally formed with the mounting plate; the mounting plate is mounted and fixed to the mounting portion, and the mounting convex portion protrudes from the mounting plate; The first airflow purge channel and the second airflow purge channel are both annular and pass through the mounting plate.

5. The detection circuit according to claim 3, wherein: The diesel nozzle assembly includes a valve needle, a first swirl assembly located at the bottom of the valve needle, a sleeve portion at least partially located below the first swirl assembly, and a second swirl assembly cooperating with the sleeve portion. The first swirl assembly includes an inlet hole and a shutoff nozzle hole. The sleeve portion is provided with a mixing chamber connected to the shutoff nozzle hole, and the mixing chamber is connected to the combustion chamber. The combustion chamber assembly includes an annular airflow channel located between the mounting seat and the diesel nozzle assembly, the annular airflow channel is connected to the air intake channel, the sleeve portion includes a first opening connecting the annular airflow channel and the mixing chamber, and the second swirl assembly includes a second connecting port connecting the annular airflow channel and the combustion chamber.

6. The detection circuit according to claim 1, wherein: The ignition coil includes a primary coil, a secondary coil and an iron core, wherein the primary coil controls the battery to charge the primary coil through a switch, the secondary coil increases the low voltage of the primary coil to a high voltage, and the iron core is used to enhance the magnetic field and electromagnetic induction effects.

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