Detection circuit and detection method for detecting whether burner is successfully ignited

Abstract

A detection circuit for detecting whether a burner is successfully ignited, comprising a burner controller (31), an ignition coil (32), a first spark plug (23), a second spark plug (24), a first high-voltage ignition wire (321) and a second high-voltage ignition wire (322), wherein the first high-voltage ignition wire (321) is connected to the ignition coil (32) and a first ignition electrode (231), and transmits a high-voltage pulse signal to the first ignition electrode (231); the second high-voltage ignition wire (322) is connected to the ignition coil (32) and a second ignition electrode (241), and transmits the high-voltage pulse signal to the second ignition electrode (241); the first ignition electrode (231) and the second ignition electrode (241) are used for breaking down a gas by means of a high voltage difference between the first ignition electrode (231) and the second ignition electrode (241), so as to generate a spark, such that fuel is ignited by the spark to form a flame (4); and if the first ignition electrode (231), the second ignition electrode (241) and a housing (1) of a burner (100) form a circuit to generate a current signal, it is determined that ignition is successful, and otherwise, it is determined that ignition fails.

Description

A detection circuit and detection method for detecting whether the burner has successfully ignited.

[0001] This application claims priority to Chinese Patent Application No. 202411707207.2, filed on November 26, 2024, entitled "Detection Circuit and Detection Method for Detecting Whether a Burner Has Ignition Successfully", the entire contents of which are incorporated herein by reference. Technical Field

[0002] This application relates to a detection circuit and detection method for detecting whether a burner has successfully ignited, belonging to the field of engine exhaust aftertreatment technology. Background Technology

[0003] With the continuous upgrading of emission regulations, how to quickly increase the temperature of exhaust gas during engine cold starts in order to shorten the time to reach the operating temperature of aftertreatment carriers and / or to perform thermal management is a technical problem faced by those skilled in the art.

[0004] To address this, some related technologies have proposed a solution involving adding a burner to the exhaust aftertreatment system. However, the detection circuit and method used to determine whether the burner has successfully ignited still have room for improvement. Summary of the Invention

[0005] The purpose of this application is to provide an improved detection circuit and detection method for detecting whether a burner has successfully ignited.

[0006] To achieve the above objectives, this application adopts the following technical solution: a detection circuit for detecting whether a burner has successfully ignited, wherein the burner includes a housing, and the detection circuit includes:

[0007] Burner controller;

[0008] Ignition coil;

[0009] A first spark plug, the first spark plug including a first ignition electrode;

[0010] The second spark plug includes a second ignition electrode;

[0011] The first ignition high-voltage wire connects the ignition coil to the first ignition electrode; the first ignition high-voltage wire transmits the high-voltage pulse signal to the first ignition electrode.

[0012] The second ignition high-voltage wire connects the ignition coil and the second ignition electrode; the second ignition high-voltage wire transmits the high-voltage pulse signal to the second ignition electrode.

[0013] The first ignition electrode and the second ignition electrode are used to break down the gas by the high voltage difference between the first ignition electrode and the second ignition electrode to form a spark, and the fuel is ignited by the spark to form a flame.

[0014] If the first ignition electrode, the second ignition electrode, and the burner housing form a circuit and generate a current signal, then ignition is determined to be successful; otherwise, ignition is determined to be unsuccessful.

[0015] As a further improvement to the technical solution of this application, the housing includes an inner cavity for allowing exhaust gas to flow, and the burner further includes:

[0016] Combustion chamber assembly, the combustion chamber assembly being mounted on the housing, the combustion chamber assembly comprising:

[0017] The cylindrical body includes a circumferential wall and a combustion chamber enclosed by the circumferential wall, the combustion chamber being connected to the inner cavity;

[0018] Mounting base, the mounting base is fixed together with the cylindrical part, the mounting base includes an air intake channel, a first wall part, a second wall part and a mounting cylindrical part;

[0019] The first spark plug is installed on the first wall and protrudes into the combustion chamber.

[0020] A second spark plug, the second spark plug being installed on the second wall portion, the second spark plug protruding into the combustion chamber; and

[0021] A diesel nozzle assembly is mounted on the mounting cylinder and is used to inject diesel fuel into the combustion chamber.

[0022] 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 orifice and a cut-off nozzle. The sleeve portion is provided with a mixing chamber communicating with the cut-off nozzle. The mixing chamber is used to mix diesel and air and is communicating with the combustion chamber.

[0023] As a further improvement to the technical solution of this application, the housing includes an inner cavity for allowing exhaust gas to flow, and the burner further includes:

[0024] Combustion chamber assembly, the combustion chamber assembly being mounted on the housing, the combustion chamber assembly comprising:

[0025] The cylindrical body includes a circumferential wall, a combustion chamber enclosed by the circumferential wall, and an opening located at the bottom of the cylindrical body, the opening connecting the combustion chamber and the inner cavity;

[0026] Mounting base, the mounting base is fixed together with the cylindrical body, the mounting base includes an air intake channel, a first wall, a first air hole through the first wall and connected to the air intake channel, a second wall, and a second air hole through the second wall and connected to the air intake channel.

[0027] The first spark plug is installed on the first wall and protrudes into the combustion chamber.

[0028] A second spark plug, the second spark plug being installed on the second wall portion, the second spark plug protruding into the combustion chamber; and

[0029] A diesel nozzle assembly, which is mounted on the mounting base, is used to inject diesel fuel into the combustion chamber;

[0030] The first spark plug is provided with a first airflow purging channel between the first spark plug and the first wall portion. The first air hole is connected to the air intake channel and the first airflow purging channel so as to use a portion of the air to purge the first spark plug.

[0031] A second airflow purging channel is also provided between the second spark plug and the second wall portion. The second air hole is connected to the air intake channel and the second airflow purging channel to use a portion of the air to purge the second spark plug.

[0032] As a further improvement to the technical solution of this application, the housing is provided with a raised mounting portion;

[0033] The mounting base includes a mounting plate and a mounting protrusion integrally formed with the mounting plate; the mounting plate is fixedly mounted to the mounting portion, and the mounting protrusion protrudes from the mounting plate;

[0034] Both the first airflow purging channel and the second airflow purging channel are annular and both penetrate the mounting plate.

[0035] As a further improvement of the technical solution of this application, the diesel nozzle assembly includes a valve needle, a first swirl assembly located at the bottom of the valve needle, a sleeve portion located at least partially 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 cut-off nozzle. The sleeve portion is provided with a mixing chamber communicating with the cut-off nozzle. The mixing chamber is communicating with the combustion chamber.

[0036] The combustion chamber assembly includes an annular airflow channel located between the mounting base 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. The second swirl assembly includes a second communication port connecting the annular airflow channel and the combustion chamber.

[0037] As a further improvement of the technical solution of this application, the ignition coil includes a primary coil, a secondary coil and an iron core, wherein the primary coil is charged by a battery through a switch, the secondary coil raises 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.

[0038] This application also discloses a detection method for detecting whether a burner has successfully ignited based on a detection circuit, wherein the detection circuit is the aforementioned detection circuit, and the detection method includes the following steps:

[0039] (a) The burner controller sends an ignition request signal to the ignition coil;

[0040] (b) The ignition coil transmits the high-voltage pulse signal to the first ignition electrode and the second ignition electrode through the first ignition high-voltage line and the second ignition high-voltage line;

[0041] (c) Determine whether a current signal is generated in the first ignition electrode, the second ignition electrode, and the burner housing due to the formation of a circuit;

[0042] (d) If yes, then ignition is considered successful; if no, then ignition is considered unsuccessful.

[0043] As a further improvement of the technical solution of this application, in step (c), the detection method includes determining whether a current signal is generated between the first ignition electrode, the second ignition electrode and the cylinder portion forming the combustion chamber due to the formation of a circuit.

[0044] As a further improvement to this application, between step (c) and step (d), the detection method further includes:

[0045] The current signal is amplified and converted into a pulse width signal, which is then output to the burner controller.

[0046] As a further improvement of the technical solution of this application, in step (d), the burner controller determines whether there is a stable flame based on the duty cycle of the pulse width signal.

[0047] Compared with the prior art, the detection circuit and detection method of this application determine whether ignition is successful by judging whether the first ignition electrode, the second ignition electrode and the burner housing are connected in a circuit after ignition to generate a current signal. The determination time for successful ignition is shorter. Attached Figure Description

[0048] Figure 1 is a perspective view of the burner of this application in one embodiment;

[0049] Figure 2 is a left view of Figure 1;

[0050] Figure 3 is the front view of Figure 1;

[0051] Figure 4 is a cross-sectional view along line AA in Figure 2;

[0052] Figure 5 is a cross-sectional view along line BB in Figure 2;

[0053] Figure 6 is a cross-sectional view along line CC in Figure 1;

[0054] Figure 7 is a three-dimensional schematic diagram of the combustion chamber assembly of the burner of this application;

[0055] Figure 8 is the front view of Figure 7;

[0056] Figure 9 is a cross-sectional view along line DD in Figure 8;

[0057] Figure 10 is a magnified view of the circled part E in Figure 9;

[0058] Figure 11 is a cross-sectional view along line FF in Figure 3;

[0059] Figure 12 is a schematic diagram of the detection circuit for detecting whether the burner has successfully ignited according to this application. Detailed Implementation

[0060] The specific embodiments of this application will now be described in detail with reference to the accompanying drawings. Where several specific embodiments exist, features in these embodiments may be combined with each other without conflict. When the description involves the accompanying drawings, unless otherwise stated, the same numbers or symbols in different drawings represent the same or similar elements. The content described in the following exemplary embodiments does not represent all embodiments of this application; rather, they are merely examples of products consistent with this application and as described in the claims.

[0061] The terminology used in this application is for the purpose of describing specific embodiments only and is not intended to limit the scope of protection of this application. It should be understood that the terms such as "first," "second," and similar words used in the specification and claims of this application do not indicate any order, quantity, or importance, but are merely used to distinguish features.

[0062] Referring to Figures 1 to 10, this application discloses a burner 100 used in a diesel engine exhaust aftertreatment system to rapidly increase the temperature of the exhaust gas and / or perform thermal management. Those skilled in the art will understand 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.

[0063] In one embodiment of this application, the housing 1 is made of metal 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 burner 100 can be detachably connected to the diesel engine exhaust aftertreatment system via the first flange 13 and the second flange 14.

[0064] The housing 1 has an inner cavity 10 to allow exhaust gas to pass through. In the embodiment illustrated in this application, 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 understand that in other embodiments of this application, the housing 1 may also be a single, integral housing. In one embodiment of this application, the first half-housing 11 and the second half-housing 12 are welded together. 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.

[0065] Furthermore, in the embodiment illustrated in this application, the housing 1 is provided with a raised mounting portion 15, the axis of which forms an angle of less than 90° (e.g., 45°) with the axis of the inner cavity 10.

[0066] The combustion chamber assembly 2 is mounted on the mounting portion 15 and at least partially protrudes into the inner cavity 10. Furthermore, the housing 1 is provided with a raised portion 16 protruding towards the mounting portion 15, which directs a portion of the exhaust gas to the combustion chamber assembly 2 to provide some degree of heat dissipation for the combustion chamber assembly 2.

[0067] In the embodiment illustrated in this application, the combustion chamber assembly 2 includes a cylindrical body 21, a mounting base 22 fixed together with the cylindrical body 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.

[0068] In the embodiment illustrated in this application, the cylindrical portion 21 is made of a metallic material and protrudes into the inner cavity 10. The cylindrical portion 21 includes a circumferential wall 211, a combustion chamber 212 enclosed by the circumferential wall 211, and an opening 213 located at the bottom of the cylindrical portion 21, the opening 213 connecting the combustion chamber 212 and the inner cavity 10.

[0069] In the embodiment illustrated in this application, the mounting base 22 is made of metal, and the cylindrical portion 21 is separately disposed from the mounting base 22 but 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 beside the mounting cylindrical portion 222. The mounting plate 221 is fixedly mounted to the mounting portion 15, and both the mounting cylindrical portion 222 and the mounting protrusion 223 protrude upward from the mounting plate 221.

[0070] The diesel nozzle assembly 25 is installed in the mounting 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 located at least partially below the first swirl assembly 252, and a second swirl assembly 254 cooperating with the sleeve portion 253.

[0071] In one embodiment of this application, the first swirl assembly 252 includes a plurality of swirl plates 2521 to form a swirl channel 2520. The top swirl plate 2521 of the first swirl assembly 252 has an inlet hole 2522, and the bottom swirl plate 2521 of the first swirl assembly 252 has a flow-blocking nozzle 2523. Each swirl plate 2521 has a swirl groove. Diesel fuel enters the swirl channel 2520 through the inlet hole 2522 of the first swirl assembly 252 and is injected into the mixing chamber 2531 from the flow-blocking nozzle 2523 at a certain angle and initial velocity. The first swirl assembly 252 can throttle the diesel fuel to a certain extent, thereby enabling the diesel fuel nozzle assembly 25 to be better atomized even at low flow rates. The flow-blocking nozzle improves the continuity of diesel fuel injection at low power, while significantly improving the accuracy of fuel injection metering. Furthermore, at high power, it accelerates diesel fuel breakup, resulting in better atomization and faster ignition. This application greatly improves the adaptability of the diesel nozzle assembly 25 to different operating conditions by setting the first swirl component 252.

[0072] In the embodiment illustrated in this application, the combustion chamber assembly 2 includes an annular airflow channel 255 located between the mounting cylinder portion 222 and the diesel nozzle assembly 25.

[0073] The sleeve portion 253 includes a mixing chamber 2531 communicating with the swirling channel 2520 and a first opening 2530 communicating with the annular airflow channel 255. In the embodiment illustrated in this application, the sleeve portion 253 includes a hollow cylindrical portion 2533 and a hollow conical portion 2534 connected to the cylindrical portion 2533. The mixing chamber 2531 penetrates the cylindrical portion 2533 and the conical portion 2534. The mixing chamber 2531 communicates with the combustion chamber 212. The second swirling assembly 254 is located outside the conical portion 2534, and a conical airflow channel 256 is formed between the second swirling assembly 254 and the conical portion 2534. The conical airflow channel 256 communicates with the combustion chamber 212. The second swirling assembly 254 also includes a second connecting port 257 connecting the annular airflow channel 255 and the conical airflow channel 256.

[0074] In the embodiment illustrated in this application, the first spark plug 23 and the second spark plug 24 are installed on the mounting protrusion 223, and both the first spark plug 23 and the second spark plug 24 protrude into the combustion chamber 212.

[0075] Specifically, the mounting protrusion 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 that penetrates the first wall portion 2231 and communicates with the air intake channel 2230, a second wall portion 2233 for mounting the second spark plug 24, and a second air hole 2234 that penetrates the second wall portion 2233 and communicates with the air intake channel 2230.

[0076] In the embodiment illustrated in this application, a first airflow purging channel 2235 is further provided between the first spark plug 23 and the first wall portion 2231, and the first airflow purging channel 2235 penetrates the mounting plate 221 to communicate with the combustion chamber 212. Similarly, a second airflow purging channel 2236 is further provided between the second spark plug 24 and the second wall portion 2233, and the second airflow purging channel 2236 penetrates the mounting plate 221 to communicate with the combustion chamber 212. In the embodiment illustrated in this application, both the first airflow purging channel 2235 and the second airflow purging channel 2236 are annular. The first air vent 2232 connects the air intake channel 2230 and the first airflow purging channel 2235 to use a portion of the air to purge the first spark plug 23 to prevent carbon buildup. The second vent 2234 connects the air intake channel 2230 and the second airflow purging channel 2236 to use a portion of the air to purge the second spark plug 24 to prevent carbon buildup.

[0077] The working principle of the burner 100 in this application is as follows:

[0078] Airflow path: Air flows into the mounting protrusion 223 from the air intake channel 2230. A portion of the airflow passes through the first air hole 2232 and enters the combustion chamber 212 through the first airflow purging channel 2235; a portion of the airflow passes through the second air hole 2234 and enters the combustion chamber 212 through the second airflow purging channel 2236; the majority of the airflow enters the annular airflow channel 255. The air entering the annular airflow channel 255 is further 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 conical airflow channel 256.

[0079] Oil circuit: Diesel fuel flows from the oil passage of the diesel nozzle assembly 25 to the first swirl assembly 252. Diesel fuel flows through the swirl channel 2520 to the mixing chamber 2531. Diesel fuel is atomized and mixed with 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 diesel fuel again (second atomization). Finally, the diesel fuel entering the combustion chamber 212 has better ignition properties.

[0080] When the ignition conditions are met, the first spark plug 23 and the second spark plug 24 discharge and ignite the diesel fuel. The combustion of the diesel fuel will rapidly raise the temperature of the exhaust gas, thereby enabling the exhaust gas aftertreatment carrier in the diesel engine exhaust gas aftertreatment system to quickly reach the working temperature. This helps to shorten the time it takes for the exhaust gas aftertreatment carrier of the diesel engine to reach the working temperature under cold start conditions.

[0081] When the burner 100 is operating, the diesel fuel 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 incomplete combustion, resulting in soot formation and carbon deposits on the first spark plug 23 and the second spark plug 24. Carbon deposits are extremely harmful; when they reach a certain level, they can cause the insulation between the first spark plug 23 and the second spark plug 24 and the mounting protrusion 223 to disappear, leading to safety issues. In this application, by introducing air through the first vent hole 2232 and the second vent hole 2234 to purge the first spark plug 23 and the second spark plug 24, the diesel fuel concentration in this area can be reduced, the air-fuel ratio increased, combustion efficiency improved, and soot formation reduced. Simultaneously, due to the enhanced airflow, soot is less likely to adhere to 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.

[0082] In addition, this application also discloses a detection method for detecting whether the burner 100 has been successfully ignited. The detection method uses a detection circuit including a burner controller 31, an ignition coil 32, a first ignition high-voltage line 321 connecting the ignition coil 32 to the first ignition electrode 231 of the first spark plug 23, and a second ignition high-voltage line 322 connecting the ignition coil 32 to the second ignition electrode 241 of the second spark plug 24.

[0083] The burner controller 31 sends an ignition request signal and receives a flame detection signal.

[0084] The ignition coil 32 includes a primary coil, a secondary coil, and an iron core. The primary coil controls the charging of the battery through a switch. The secondary coil raises the low voltage of the primary coil to a high voltage. The iron core is used to enhance the magnetic field and electromagnetic induction effect.

[0085] The first ignition high voltage line 321 transmits the high voltage pulse signal to the first ignition electrode 231, and the second ignition high voltage line 322 transmits the high voltage pulse signal to the second ignition electrode 241.

[0086] The first ignition electrode 231 and the second ignition electrode 241 are used to break down the gas by the high voltage difference between the two electrodes to form a spark. The fuel is ignited by the spark to form a flame 4.

[0087] The working principle of the detection method is as follows: The burner controller 31 controls the charging and discharging of the primary coil. When the primary coil is powered on, 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 of the primary coil decays rapidly, and the secondary coil induces a very high voltage. This high-voltage pulse signal is transmitted to the first spark plug 23 and the second spark plug 24 through the first ignition high-voltage line 321 and the second ignition high-voltage line 322, and the resulting spark ignites the mixture of diesel and air to produce a flame 4. When diesel burns, it produces a large number of charged positive and negative ions and electrons. These charged ions form a circuit between the first ignition electrode 231, the second ignition electrode 241, and the housing 1 of the burner 100, generating a weak current signal. This current signal is amplified and converted into a pulse width signal, which is then output to the burner controller 31. Specifically, in one embodiment of this application, 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 then 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.

[0088] The detection method includes the following steps:

[0089] (a) The burner controller 31 sends an ignition request signal to the ignition coil 32;

[0090] (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 line 321 and the second ignition high-voltage line 322;

[0091] (c) Determine whether a current signal is generated in the first ignition electrode 231, the second ignition electrode 241 and the housing 1 of the burner 100 due to the formation of a circuit;

[0092] (d) If yes, then ignition is considered successful; if no, then ignition is considered unsuccessful.

[0093] In step (c), the detection method includes determining whether a current signal is generated between the first ignition electrode 231, the second ignition electrode 241, and the cylinder portion 21 forming the combustion chamber 212 due to the formation of a circuit.

[0094] Between step (c) and step (d), the detection method further includes:

[0095] The current signal is amplified and converted into a pulse width signal, which is then output to the burner controller 31.

[0096] 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 ignition is successful.

[0097] The detection method of this application has the following beneficial effects:

[0098] (1) Due to the fast transmission speed of electrical signals, the time for judging successful ignition is short. Since ignition requires a large amount of fuel injection and a low air-fuel ratio, although this is conducive to rapid ignition, the emission of hydrocarbons will be higher. This application uses ion signals to judge whether ignition is successful. The burner controller 31 can adjust the air-fuel ratio in advance to ensure more complete combustion of fuel.

[0099] (2) When flame 4 is lost, this application can also make a quick judgment, thereby preventing excessive fuel injection that leads to excessive hydrocarbon emissions.

[0100] (3) It is helpful to diagnose carbon deposits on the ignition electrodes (e.g., the first ignition electrode 231 and / or the second ignition electrode 241). When the ignition electrodes are not injected, the ignition electrodes can be operated, and the presence of carbon deposits around the ignition electrodes can be determined based on the feedback pulse width signal. When there is no flame 4 but the ion signal is still present, it indicates that a circuit may have been formed between the ignition electrodes and the cylinder portion 21 that forms the combustion chamber 212 due to carbon deposits.

[0101] The above embodiments are only used to illustrate this application and are not intended to limit the technical solutions described in this application. All technical solutions and their improvements that do not depart from the spirit and scope of this application should be covered within the scope of the claims of this application.

Claims

1. A detection circuit for detecting whether a burner has successfully ignited, the burner comprising a housing, characterized in that, The detection circuit includes: Burner controller; Ignition coil; A first spark plug, the first spark plug including a first ignition electrode; The second spark plug includes a second ignition electrode; The first ignition high-voltage wire connects the ignition coil to the first ignition electrode; the first ignition high-voltage wire transmits the high-voltage pulse signal to the first ignition electrode. The second ignition high-voltage wire connects the ignition coil and the second ignition electrode; the second ignition high-voltage wire transmits the high-voltage pulse signal to the second ignition electrode. The first ignition electrode and the second ignition electrode are used to break down the gas by the high voltage difference between the first ignition electrode and the second ignition electrode to 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 burner housing form a circuit and generate a current signal, then ignition is determined to be successful; otherwise, ignition is determined to be unsuccessful.

2. The detection circuit as described in claim 1, characterized in that: The housing includes an inner cavity for allowing exhaust gases to pass through, and the burner further includes: Combustion chamber assembly, the combustion chamber assembly being mounted on the housing, the combustion chamber assembly comprising: The cylindrical body includes a circumferential wall and a combustion chamber enclosed by the circumferential wall, the combustion chamber being connected to the inner cavity; Mounting base, the mounting base is fixed together with the cylindrical part, the mounting base includes an air intake channel, a first wall part, a second wall part and a mounting cylindrical part; The first spark plug is installed on the first wall and protrudes into the combustion chamber. A second spark plug, the second spark plug being installed on the second wall portion, the second spark plug protruding into the combustion chamber; and A diesel nozzle assembly is mounted on the mounting cylinder and is used to inject diesel fuel into the combustion chamber. 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 orifice and a cut-off nozzle. The sleeve portion is provided with a mixing chamber communicating with the cut-off nozzle. The mixing chamber is used to mix diesel and air and is communicating with the combustion chamber.

3. The detection circuit as described in claim 1, characterized in that: The housing includes an inner cavity for allowing exhaust gases to pass through, and the burner further includes: Combustion chamber assembly, the combustion chamber assembly being mounted on the housing, the combustion chamber assembly comprising: The cylindrical body includes a circumferential wall, a combustion chamber enclosed by the circumferential wall, and an opening located at the bottom of the cylindrical body, the opening connecting the combustion chamber and the inner cavity; Mounting base, the mounting base is fixed together with the cylindrical body, the mounting base includes an air intake channel, a first wall, a first air hole through the first wall and connected to the air intake channel, a second wall, and a second air hole through the second wall and connected to the air intake channel. The first spark plug is installed on the first wall and protrudes into the combustion chamber. A second spark plug, the second spark plug being installed on the second wall portion, the second spark plug protruding into the combustion chamber; and A diesel nozzle assembly, which is mounted on the mounting base, is used to inject diesel fuel into the combustion chamber; The first spark plug is provided with a first airflow purging channel between the first spark plug and the first wall portion. The first air hole is connected to the air intake channel and the first airflow purging channel so as to use a portion of the air to purge the first spark plug. A second airflow purging channel is also provided between the second spark plug and the second wall portion. The second air hole is connected to the air intake channel and the second airflow purging channel to use a portion of the air to purge the second spark plug.

4. The detection circuit as described in claim 3, characterized in that: The housing is provided with a raised mounting portion; The mounting base includes a mounting plate and a mounting protrusion integrally formed with the mounting plate; the mounting plate is fixedly mounted to the mounting portion, and the mounting protrusion protrudes from the mounting plate; Both the first airflow purging channel and the second airflow purging channel are annular and both penetrate the mounting plate.

5. The detection circuit as described in claim 3, characterized in that: The diesel injector assembly includes a valve needle, a first swirl assembly located at the bottom of the valve needle, a sleeve portion located at least partially below the first swirl assembly, and a second swirl assembly cooperating with the sleeve portion. The first swirl assembly includes an inlet orifice and a cut-off nozzle orifice. The sleeve portion is provided with a mixing chamber communicating with the cut-off nozzle orifice, and the mixing chamber is communicating with the combustion chamber. The combustion chamber assembly includes an annular airflow channel located between the mounting base 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. The second swirl assembly includes a second communication port connecting the annular airflow channel and the combustion chamber.

6. The detection circuit as described in claim 1, characterized in that: The ignition coil includes a primary coil, a secondary coil, and an iron core. The primary coil is charged by a battery through a switch. The secondary coil raises the low voltage of the primary coil to a high voltage. The iron core is used to enhance the magnetic field and electromagnetic induction effect.

7. A detection method for determining whether a burner has successfully ignited based on a detection circuit, characterized in that, The detection circuit is the detection circuit as described in any one of claims 1 to 6, and the detection method includes the following steps: (a) The burner controller sends an ignition request signal to the ignition coil; (b) The ignition coil transmits the high-voltage pulse signal to the first ignition electrode and the second ignition electrode through the first ignition high-voltage line and the second ignition high-voltage line; (c) Determine whether a current signal is generated in the first ignition electrode, the second ignition electrode, and the burner housing due to the formation of a circuit; (d) If yes, then ignition is considered successful; if no, then ignition is considered unsuccessful.

8. The detection method as described in claim 7, characterized in that: In step (c), the detection method includes determining whether a current signal is generated between the first ignition electrode, the second ignition electrode, and the cylinder portion forming the combustion chamber due to the formation of a circuit.

9. The detection method as described in claim 7, characterized in that: Between step (c) and step (d), the detection method further includes: The current signal is amplified and converted into a pulse width signal, which is then output to the burner controller.

10. The detection method as described in claim 9, characterized in that: In step (d), the burner controller determines whether there is a stable flame based on the duty cycle of the pulse width signal.

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