Electric heating nozzle, control method, device and storage medium

Abstract

The present invention provides an electric heating nozzle, which comprises a nozzle body, and a metal pipeline is connected to the inlet end of the nozzle body; the metal pipeline is sleeved on the urea inlet pipe of the nozzle body; an electromagnetic coil is sleeved on the connecting section where the metal pipeline is connected to the nozzle body; a metal protective cover is arranged on the outer periphery of the electromagnetic coil; the electromagnetic coil is connected to the output end of an electromagnetic induction generator; the electromagnetic induction generator is controlled by a processor. The present invention also proposes a corresponding electric heating control method, which can rapidly increase the urea temperature by driving an electromagnetic heating device when the engine is cold-started and the exhaust gas temperature at the nozzle installation location cannot meet the normal urea injection start temperature, thereby reducing the exhaust gas temperature required for urea hydrolysis.

Description

Technical Field

[0001] The present invention relates to the field of diesel engine exhaust aftertreatment, and in particular to an electric heating nozzle, a control method, a device and a storage medium. Background Art

[0002] With the increasingly stringent emission regulations, it is expected that the national VII emission regulations will further reduce the emission limits of pollutants NOx, PM, and PN on the basis of the national VI emission regulations; currently, the national VI emission regulations for heavy-duty vehicles use the WHSC and WHTC cycles for bench emission tests, and the NOx emission limits are 0.4 g / kWh and 0.46 g / kWh respectively; the WHTC cycle is divided into a cold cycle and a hot cycle, with their weights accounting for 14% and 86% respectively; it is expected that the NOx emission limit in the national VII emission regulations will be further tightened to 0.12 g / kWh, which is about 70% lower than the national VI emission limit.

[0003] The urea injection system is the core of the SCR aftertreatment system, and the nozzle is a key component of the injection system; since the exhaust temperature is relatively low when the diesel engine is just started, and urea cannot be hydrolyzed into ammonia at low temperatures, the SCR urea injection system cannot inject when the exhaust temperature is below 180°C; urea hydrolysis is an endothermic reaction, and increasing the urea temperature is beneficial to reducing the exhaust temperature required for urea injection; by quickly increasing the urea temperature, urea can be injected and hydrolyzed into NH3 at a lower exhaust temperature.

[0004] Raising the temperature of the urea aqueous solution from room temperature to 80°C - 90°C allows urea to be injected for hydrolysis reaction at an exhaust temperature of ≥150°C, greatly reducing the urea injection start temperature, which is one of the effective means to solve low-temperature emissions. Summary of the Invention

[0005] To solve at least one technical problem in the prior art, embodiments of the present invention provide an electric heating nozzle, a control method, a device and a storage medium, which are beneficial to reducing the exhaust temperature required for urea injection and are used to solve the problem of low-temperature NOx emissions. The technical solutions adopted by the embodiments of the present invention to achieve the above technical purposes are as follows:

[0006] In a first aspect, embodiments of the present invention provide an electric heating nozzle, including a nozzle body, and a metal pipeline is connected to the inlet end of the nozzle body; the metal pipeline is sleeved on the urea inlet pipe of the nozzle body; an electromagnetic coil is sleeved on the connection section where the metal pipeline is connected to the nozzle body; a metal protective cover is provided on the outer periphery of the electromagnetic coil;

[0007] The electromagnetic coil is connected to the output end of an electromagnetic induction generator; the electromagnetic induction generator is controlled by a processor.

[0008] Further, the diameter of the connection section is larger than the diameters of other sections of the metal pipeline.

[0009] In a second aspect, an embodiment of the present invention provides an electric heating control method, which is applicable to the electric heating nozzle as described above, and includes the following steps:

[0010] Step S10: After the vehicle starts, first detect the temperature signal of the exhaust gas upstream of the SCR.

[0011] Step S20: When the detected temperature is lower than the first injection temperature threshold, drive the electric heating nozzle into the preheating state. At this time, control the nozzle body not to inject urea, so that the electromagnetic induction generator operates in a low-power state.

[0012] Step S30: When the detected temperature is greater than or equal to the first injection temperature threshold, drive the electric heating nozzle into the full-load heating state. At this time, control the electromagnetic induction generator to operate in the maximum-power state, and control the nozzle body to inject urea.

[0013] Step S40: After the detected temperature is greater than the second injection temperature threshold, stop heating the electric heating nozzle. At this time, control the electromagnetic induction generator to cut off the output; control the nozzle body to inject urea.

[0014] Further, the first injection temperature threshold is configured to be between 150°C and 155°C.

[0015] Further, the low-power state of the electromagnetic induction generator is 10% - 30% of its maximum-power state.

[0016] Further, the second injection temperature threshold is configured to be between 200°C and 230°C.

[0017] In a third aspect, an embodiment of the present invention provides an electric heating control device, including:

[0018] A memory storing a computer program;

[0019] A processor for running the computer program, and when the computer program runs, it executes the steps of the method as described above.

[0020] In a fourth aspect, an embodiment of the present invention provides a storage medium, in which a computer program is stored, and the computer program is configured to execute the steps of the method as described above when running.

[0021] The beneficial effects brought by the technical solutions provided in the embodiments of the present invention are as follows: Through the electric heating nozzle and the corresponding electric heating control method provided by the present invention, when the engine is cold-started and the exhaust gas temperature at the nozzle installation location cannot meet the normal urea injection start temperature, the electromagnetic heating device can be driven to quickly increase the urea temperature, thereby reducing the exhaust gas temperature required for urea hydrolysis, enabling urea to be injected at a lower exhaust gas temperature, effectively reducing emission pollutants, and meeting the emission control requirements. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a schematic structural diagram of the electric heating nozzle in the embodiment of the present invention.

[0023] Figure 2 It is a schematic diagram of the electric heating control method in the embodiment of the present invention. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0024] In order to make the objectives, technical solutions and advantages of the present invention clearer and more understandable, the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0025] In the description of the embodiments of the present invention, it should be noted that the orientation or positional relationship indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the present invention. In addition, the terms "first", "second", and "third" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0026] In the description of the embodiments of the present invention, it should be noted that unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected, or indirectly connected through an intermediate medium, and can also be the internal communication of two components. It can be a wireless connection or a wired connection. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0027] In addition, the technical features involved in the different embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0028] Such as Figure 1As shown in the figure, an electric heating nozzle proposed in an embodiment of the present invention includes a nozzle body 1, and a metal pipeline 2 is connected to the inlet end of the nozzle body 1; the metal pipeline 2 is sleeved on the urea inlet pipe of the nozzle body 1; an electromagnetic coil 3 is sleeved on the connection section 201 where the metal pipeline 2 is connected to the nozzle body 1; a metal protective cover 4 is arranged on the outer periphery of the electromagnetic coil 3;

[0029] The electromagnetic coil 3 is connected to the output end of an electromagnetic induction generator; the electromagnetic induction generator is controlled by a post-treatment controller ACU; the post-treatment controller ACU controls the on / off and driving duty ratio of the electromagnetic induction generator by issuing instructions to achieve variable and adjustable heating power; in other embodiments, the electromagnetic induction generator can also be controlled by a separate processor;

[0030] Specifically, the electromagnetic coil 2 is a low-resistance copper coil with an insulating material wrapped on the outer layer; the metal protective cover 4 plays a role in shielding electromagnetic interference, preventing the electromagnetic coil 2 from interfering with the solenoid valve of the nozzle, and at the same time can play a certain heat preservation role; it also prevents the electromagnetic coil 2 from being damaged by external bumps;

[0031] The electric heating nozzle proposed in this application can quickly heat the urea aqueous solution flowing through the metal pipeline 2 through the principle of induction heating; the electromagnetic induction generator drives the electromagnetic coil 2, and the electromagnetic coil 2 generates an alternating electromagnetic field with a relatively high energy density, generating an eddy current effect on the metal pipeline 2, converting electrical energy into heat energy; the urea aqueous solution in the urea inlet pipe flowing through the metal pipeline 2 can be quickly heated; the advantage of electromagnetic induction heating is high heating efficiency, fast heating speed, and non-contact heating can be achieved;

[0032] More preferably, the diameter of the connection section 201 is larger than the diameters of other sections of the metal pipeline 2; the diameter of the connection section 201 is thickened here, which can generate more heat in the connection section, facilitating the rapid heating of the urea aqueous solution in the urea inlet pipe;

[0033] Based on the electric heating nozzle proposed in the above embodiment, an embodiment of the present invention also proposes an electric heating control method, which is implemented by the post-treatment controller ACU, as Figure 2 shown, including the following steps:

[0034] Step S10, after the vehicle is started, first detect the temperature signal of the exhaust gas upstream of the SCR;

[0035] Step S20, when the detected temperature is lower than the first injection temperature threshold, drive the electric heating nozzle into the preheating state, and at this time control the nozzle body not to inject urea, so that the electromagnetic induction generator operates in a low-power state;

[0036] Specifically, the first injection temperature threshold is configured to be between 150°C and 155°C;

[0037] The low-power state of the electromagnetic induction generator is 10% to 30% of its maximum power state;

[0038] Step S30, when the detected temperature is greater than or equal to the first injection temperature threshold, drive the electro-heating nozzle into the full-load heating state. At this time, control the electromagnetic induction generator to operate at the maximum power state, and control the nozzle body to inject urea;

[0039] In this stage, the urea aqueous solution can be quickly heated to the predetermined temperature, so that the urea aqueous solution can be injected earlier at a lower exhaust temperature, reducing the NOx value of the diesel engine low-temperature emissions;

[0040] Step S40, when the detected temperature is greater than the second injection temperature threshold, stop heating the electro-heating nozzle. At this time, control the electromagnetic induction generator to cut off the output; control the nozzle body to inject urea;

[0041] The second injection temperature threshold is configured to be between 200°C and 230°C; at this time, the exhaust temperature has reached the temperature at which normal-temperature urea can be hydrolyzed, and the ACU can drive and control the nozzle body to inject urea normally.

[0042] The embodiment of the present invention also proposes an electro-heating control device, including: a processor and a memory; the processor communicates with the memory, for example, connected and communicated with each other through a communication bus; the memory stores a computer program; the processor is used to run the computer program, and when the computer program runs, it executes the steps of the method described above; the processor can adopt a post-processing controller ACU, or a CPU, or other general-purpose processors, a digital signal processor (Digital Signal Processor, DSP), an application-specific integrated circuit (Application Specific Integrated Circuit, ASIC), a field-programmable gate array (Field-Programmable Gate Array, FPGA) or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components and other chips, or a combination of the above various chips or circuits; the memory can include volatile memory, such as random access memory; the memory can also include non-volatile memory, such as flash memory, hard disk or solid-state drive; the memory can also include a combination of the above types of memory;

[0043] An embodiment of the present invention also provides a storage medium, in which a computer program is stored, and the computer program is configured to execute the steps of the method described above when running; the storage medium can be a magnetic disk, an optical disk, a read-only memory (ROM), a random access memory (RAM), a flash memory, a hard disk drive (HDD), or a solid-state drive (SSD), etc.; the storage medium can also include a combination of the above-mentioned types of memories.

[0044] Finally, it should be noted that the above specific embodiments are only used to illustrate the technical solutions of the present invention rather than to limit them. Although the present invention has been described in detail with reference to the embodiments, those of ordinary skill in the art should understand that the technical solutions of the present invention can be modified or equivalently replaced without departing from the spirit and scope of the technical solutions of the present invention, and they should all be covered by the scope of the claims of the present invention.

Claims

1. An electric heating control method is applicable to an electric heating nozzle. The electric heating nozzle includes a nozzle body, and a metal pipeline is connected to the inlet end of the nozzle body; the metal pipeline is sleeved on the urea inlet pipe of the nozzle body; an electromagnetic coil is sleeved on the connecting section where the metal pipeline is connected to the nozzle body; a metal protective cover is arranged on the outer periphery of the electromagnetic coil; the electromagnetic coil is connected to the output end of an electromagnetic induction generator; the electromagnetic induction generator is controlled by a processor; It is characterized in that, The method includes the following steps: Step S10, after the vehicle starts, first detect the temperature signal of the exhaust gas upstream of the SCR; Step S20, when the detected temperature is lower than the first injection temperature threshold, drive the electric heating nozzle into the preheating state. At this time, control the nozzle body not to inject urea, so that the electromagnetic induction generator operates in a low-power state; Step S30, when the detected temperature is greater than or equal to the first injection temperature threshold, drive the electric heating nozzle into the full-load heating state. At this time, control the electromagnetic induction generator to operate in the maximum-power state, and control the nozzle body to inject urea; Step S40, when the detected temperature is greater than the second injection temperature threshold, stop heating the electric heating nozzle. At this time, control the electromagnetic induction generator to cut off the output; control the nozzle body to inject urea; The first injection temperature threshold is configured to be between 150°C and 155°C; The low-power state of the electromagnetic induction generator is 10% - 30% of its maximum-power state; The second injection temperature threshold is configured to be between 200°C and 230°C.

2. The electric heating control method according to claim 1, wherein, the diameter of the connecting section is larger than the diameters of other sections of the metal pipeline.

3. An electric heating control device, characterized in that, It includes: a memory storing a computer program; a processor for running the computer program, and when the computer program runs, it executes the steps of the method according to any one of claims 1 - 2.

4. A storage medium, characterized in that, the storage medium stores a computer program, and the computer program is configured to execute the steps of the method according to any one of claims 1 - 2 when running.

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