Diesel engine aftertreatment device
By setting up a pressure sensor and directional valve in the diesel engine post-treatment device, the pressure difference is used to control the flow direction of the mixed gas, the efficient regeneration treatment of DPF is achieved, and the problems of local overheating and low regeneration efficiency of DPF are solved, and the emission performance and use of the diesel engine are improved. life.
Patent Information
- Application Number
- CN202411373018.6
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2024-09-29
- Publication Date
- 2025-01-03
AI Technical Summary
Diesel engine particle trap (DPF) is easily damaged by local overheating after long use. The traditional DPF regeneration method has problems such as high temperature requirements, high oil requirements and narrow catalyst activity range, which affects the regeneration efficiency.
A diesel engine post-treatment device is designed. By setting a pressure sensor and a directional valve on the parallel branch of the DPF, the pressure difference is used to control the flow direction of the mixed gas, and the efficient filtration and regeneration of carbon particles in the mixed gas are achieved to avoid overheating of the carrier.
It improves the regeneration efficiency of DPF, extends the service life of DPF, reduces exhaust back pressure and fuel consumption, and meets the requirements of increasingly stringent emission regulations.
Smart Images
Figure CN119244345A_ABST
Abstract
Description
Technical Field
[0001] The present application relates to the technical field of diesel engines, and in particular to a diesel engine aftertreatment device. Background Art
[0002] Diesel engines are widely used in transportation, industrial and agricultural production and other fields due to their advantages such as good fuel economy, high reliability, high thermal efficiency and long service life. The main pollutants emitted by diesel engines are nitrogen oxides NOx and particulate matter (PM), especially PM, which seriously endangers human health. In recent years, increasingly stringent emission regulations have put forward higher requirements for diesel engine PM emissions. Diesel particulate filter (DPF) technology is considered to be the most effective post-treatment method to reduce PM at present, with a capture efficiency of more than 90%. However, as DPF continuously captures PM in the exhaust, DPF will be blocked, resulting in increased exhaust back pressure, decreased performance and increased fuel consumption of the diesel engine. Therefore, the key to DPF technology is to remove the PM adsorbed by DPF in a timely manner, that is, DPF regeneration.
[0003] Traditional DPF regeneration methods are mainly divided into active regeneration and passive regeneration. Active regeneration includes thermal regeneration methods such as fuel injection heating regeneration, electric heating regeneration, microwave heating regeneration and infrared heating regeneration. Thermal regeneration technology mainly uses external energy to heat and burn PM deposited on the DPF. The reaction temperature is usually as high as 600°C or above, and the carrier is easily damaged due to local overheating. Passive regeneration mainly includes catalytic regeneration and continuous regeneration. Compared with thermal regeneration, catalytic regeneration technology with catalysts and continuous regeneration technology can greatly reduce the reaction temperature of PM, but the temperature range in which the catalyst remains active is narrow and the requirements for oil products are high. Therefore, traditional DPF regeneration methods have their own shortcomings and are subject to certain restrictions in use. Summary of the invention
[0004] The purpose of the present application is to provide a diesel engine aftertreatment device, which can solve the problem of damage caused by local overheating of the carrier and improve the regeneration efficiency.
[0005] The embodiment of the present application is implemented as follows:
[0006] The embodiment of the present application provides a diesel engine aftertreatment device, comprising an aftertreatment pipeline whose two ends are respectively connected to an intake channel and an exhaust channel of the diesel engine, a first branch and a second branch are arranged in parallel on the pipeline in the discharge direction of the exhaust channel through a first directional valve, a first DPF is arranged on the first branch, a second DPF is arranged on the second branch, the first branch and the second branch are connected at far ends, the first branch and the second branch are connected to the intake channel through a second directional valve on the loop of the first branch and the second branch, a first pressure sensor is respectively arranged upstream and downstream of the first DPF, a second pressure sensor is respectively arranged upstream and downstream of the second DPF, and the first pressure sensor and the second pressure sensor as well as the first directional valve and the second directional valve are respectively electrically connected to a controller;
[0007] The mixed gas discharged from the exhaust passage of the diesel engine passes through the first DPF of the first branch and the second DPF of the second branch in sequence according to the selection of the first directional valve, and then flows into the diesel engine through the intake passage through the loop connected by the second directional valve.
[0008] Optionally, as an implementable manner, when the first directional valve chooses to connect to the first branch, the second directional valve chooses to connect to the circuit of the second branch, and when the first directional valve chooses to connect to the second branch, the second directional valve chooses to connect to the circuit of the first branch.
[0009] Optionally, as an implementable manner, a first vent and a second vent are disposed at a distal end of the first branch, a third vent and a fourth vent are disposed at a distal end of the second branch, and the first vent is connected to the third vent.
[0010] Optionally, as an implementable manner, the first vent and the third vent are connected via a connecting pipe, and a two-way valve electrically connected to a controller is provided in the connecting pipe to adjust the ventilation direction in the connecting pipe through the two-way valve.
[0011] Optionally, as an implementable manner, the second air vent is connected to a first air outlet pipe, and the fourth air vent is connected to a second air outlet pipe.
[0012] Optionally, as an implementable manner, a first control valve electrically connected to the controller is provided on the first air outlet pipe, and a second control valve electrically connected to the controller is provided on the second air outlet pipe.
[0013] Optionally, as an implementable manner, a third air outlet pipe is further included, and the distal end of the first air outlet pipe and the distal end of the second air outlet pipe are connected to the air inlet end of the third air outlet pipe.
[0014] Optionally, as an implementable manner, a throttle valve electrically connected to the controller is provided on the third air outlet pipe, and the ventilation flow in the third air outlet pipe is regulated by the throttle valve.
[0015] Optionally, as an implementable manner, a first filter is provided in the first DPF, and a second filter is provided in the second DPF, and carbon particles in the mixed gas discharged from the exhaust channel are filtered through the first filter and the second filter.
[0016] Optionally, as an implementable manner, a radiator is also provided on the air intake passage.
[0017] The beneficial effects of the embodiments of the present application include:
[0018] The diesel engine aftertreatment device provided by the present application comprises an aftertreatment pipeline whose two ends are respectively connected to the intake channel and the exhaust channel of the diesel engine, a first branch and a second branch are arranged in parallel on the pipeline in the discharge direction of the exhaust channel through a first directional valve, a first DPF is arranged on the first branch, a second DPF is arranged on the second branch, the far ends of the first branch and the second branch are connected, and the loops of the first branch and the second branch are connected to the intake channel through a second directional valve, a first pressure sensor is arranged upstream and downstream of the first DPF, and a second pressure sensor is arranged upstream and downstream of the second DPF, respectively, and the first pressure sensor and the second pressure sensor as well as the first directional valve and the second directional valve are electrically connected to a controller respectively; the mixed gas discharged from the exhaust channel of the diesel engine passes through the first DPF of the first branch and the second DPF of the second branch in sequence according to the selection of the first directional valve, and then flows into the diesel engine through the intake channel through the loop connected by the second directional valve, and the carbon particles in the mixed gas are regenerated through the diesel engine to solve the problem of local overheating and damage of the carrier and improve the regeneration efficiency. BRIEF DESCRIPTION OF THE DRAWINGS
[0019] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present application and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without paying creative work.
[0020] Figure 1 One of the structural schematic diagrams of the diesel engine aftertreatment device provided in the embodiment of the present application;
[0021] Figure 2 The second structural schematic diagram of the diesel engine after-treatment device provided in the embodiment of the present application;
[0022] Figure 3This is the third structural schematic diagram of the diesel engine after-treatment device provided in the embodiment of the present application.
[0023] Icons: 100-diesel engine after-treatment device; 110-after-treatment pipeline; 111-first directional valve; 112-first branch; 1121-first DPF; 113-second branch; 1131-second DPF; 114-connecting pipe; 1141-two-way valve; 115-first outlet pipe; 1151-first control valve; 116-second outlet pipe; 1161-second control valve; 117-third outlet pipe; 1171-throttle valve; 118-second directional valve; 120-first pressure sensor; 130-second pressure sensor; 140-controller; 200-diesel engine; 210-intake channel; 211-radiator; 220-exhaust channel. DETAILED DESCRIPTION
[0024] In order to make the purpose, technical solution and advantages of the embodiments of the present application clearer, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, rather than all the embodiments. The components of the embodiments of the present application described and shown in the drawings here can be arranged and designed in various different configurations.
[0025] Therefore, the following detailed description of the embodiments of the present application provided in the accompanying drawings is not intended to limit the scope of the present application for which protection is sought, but merely represents selected embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in the field without creative work are within the scope of protection of the present application.
[0026] It should be noted that similar reference numerals and letters represent similar items in the following drawings, so once an item is defined in one drawing, it does not need to be further defined and explained in the subsequent drawings. In addition, the terms "first", "second", "third", etc. are only used to distinguish the description and cannot be understood as indicating or implying relative importance.
[0027] In the description of this application, it should also be noted that, unless otherwise clearly specified and limited, the terms "set", "install", "connect", and "connect" 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 a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two elements. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.
[0028] Please refer to Figure 1The present embodiment provides a diesel engine aftertreatment device 100, comprising an aftertreatment pipeline 110, the two ends of which are respectively connected to an intake channel 210 and an exhaust channel 220 of a diesel engine 200, a first branch 112 and a second branch 113 are arranged in parallel on the pipeline in the discharge direction of the exhaust channel 220 through a first directional valve 111, a first DPF 1121 is arranged on the first branch 112, a second DPF 1131 is arranged on the second branch 113, the first branch 112 and the second branch 113 are connected at far ends, the first branch 112 and the second branch 113 are connected to the intake channel 210 through a second directional valve 118 on the loop of the first branch 112 and the second branch 113, a first pressure sensor 120 is respectively arranged upstream and downstream of the first DPF 1121, a second pressure sensor 130 is respectively arranged upstream and downstream of the second DPF 1131, the first pressure sensor 120 and the second pressure sensor 130 and the first directional valve 111 and the second directional valve 118 are respectively electrically connected to a controller 140;
[0029] The mixed gas exhausted from the exhaust passage 220 of the diesel engine 200 passes through the first DPF 1121 of the first branch 112 and the second DPF 1131 of the second branch 113 in sequence according to the selection of the first directional valve 111, and then flows into the diesel engine 200 through the intake passage 210 through the loop connected by the second directional valve 118.
[0030] Specifically, when using the diesel engine aftertreatment device 100 of the present application, the first pressure sensor 120 upstream and downstream of the first DPF 1121 and the second pressure sensor 130 upstream and downstream of the first DPF 1121 respectively send pressure detection values to the controller 140, and the controller 140 calculates the pressure difference between the upstream and downstream of the first DPF 1121 and the pressure difference between the upstream and downstream of the second DPF 1131, and compares the sizes of the two pressure difference values. When the pressure difference between the upstream and downstream of the first DPF 1121 is less than the pressure difference between the upstream and downstream of the second DPF 1131, the controller 140 controls the first directional valve 111 to select the connection with the first branch 112, and controls the second directional valve 118 to select the connection with the second branch 113. The mixed gas discharged from the exhaust channel 220 of the diesel engine 200 passes through the first DPF 1121 of the first branch 112 in sequence according to the selection of the first directional valve 111 for carbon particle filtration, and then enters the second branch 113, carrying The carbon particles in the second DPF 1131 flow into the diesel engine 200 through the loop connected by the second directional valve 118 via the intake passage 210, and the particulate matter is burned by the diesel engine 200 to reduce the exhaust emission of the diesel engine 200. At this time, the pressure difference between the upstream and downstream of the first DPF 1121 is greater than the pressure difference between the upstream and downstream of the second DPF 1131. The controller 140 controls the first directional valve 111 to select the connection with the second branch 113, and controls the second directional valve 118 to select the connection with the first branch 112. The mixed gas discharged from the exhaust passage 220 of the diesel engine 200 passes through the second DPF 1131 of the second branch 113 in sequence according to the selection of the first directional valve 111 to filter the carbon particles, and then enters the first branch 112, carrying the carbon particles in the first DPF 1121 through the loop connected by the second directional valve 118 via the intake passage 210 into the diesel engine 200, and the particulate matter is burned by the diesel engine 200, thereby improving the treatment efficiency of the carbon particles.
[0031] The diesel engine aftertreatment device 100 provided in the present application comprises an aftertreatment pipeline 110 respectively connected to an intake channel 210 and an exhaust channel 220 of a diesel engine 200 at both ends, a first branch 112 and a second branch 113 are arranged in parallel on the pipeline in the discharge direction of the exhaust channel 220 through a first directional valve 111, a first DPF 1121 is arranged on the first branch 112, a second DPF 1131 is arranged on the second branch 113, the far ends of the first branch 112 and the second branch 113 are connected, the loops of the first branch 112 and the second branch 113 are connected to the intake channel 210 through a second directional valve 118, a first pressure sensor 120 is respectively arranged upstream and downstream of the first DPF 1121, and a pressure sensor 120 is arranged at the upstream and downstream of the first DPF 1121. A second pressure sensor 130 is provided upstream and downstream of the second DPF 1131, respectively, and the first pressure sensor 120 and the second pressure sensor 130 as well as the first directional valve 111 and the second directional valve 118 are electrically connected to the controller 140, respectively; the mixed gas discharged from the exhaust passage 220 of the diesel engine 200 passes through the first DPF 1121 of the first branch 112 and the second DPF 1131 of the second branch 113 in sequence according to the selection of the first directional valve 111, and then flows into the diesel engine 200 through the intake passage 210 through the loop connected by the second directional valve 118, and the carbon particles in the mixed gas are regenerated inside the diesel engine 200 to solve the problem of local overheating and damage of the carrier and improve the regeneration efficiency.
[0032] In a feasible embodiment of the present application, Figure 1 As shown, when the first directional valve 111 selects to connect the first branch 112 , the second directional valve 118 selects to connect the circuit of the second branch 113 ; when the first directional valve 111 selects to connect the second branch 113 , the second directional valve 118 selects to connect the circuit of the first branch 112 .
[0033] Please refer to Figure 1 and Figure 2 When the first directional valve 111 selects to connect to the first branch 112, the second directional valve 118 selects to connect to the loop of the second branch 113. The mixed gas discharged from the exhaust passage 220 of the diesel engine 200 passes through the first DPF 1121 of the first branch 112 for carbon particle filtration according to the selection of the first directional valve 111, and then enters the second branch 113. The mixed gas carries the carbon particles in the second DPF 1131 and flows into the diesel engine 200 through the loop connected by the second directional valve 118 through the intake passage 210. The particulate matter is burned by the diesel engine 200 to reduce the exhaust emissions of the diesel engine 200.
[0034] Please refer to Figure 1 and Figure 3When the first directional valve 111 selects to connect to the second branch 113, the second directional valve 118 selects to connect to the loop of the first branch 112. The mixed gas discharged from the exhaust passage 220 of the diesel engine 200 passes through the second DPF 1131 of the second branch 113 in sequence according to the selection of the first directional valve 111 for carbon particle filtration. After entering the first branch 112, the mixed gas carrying the carbon particles in the first DPF 1121 flows into the diesel engine 200 through the loop connected by the second directional valve 118 through the intake passage 210, and the particulate matter is burned by the diesel engine 200, thereby improving the treatment efficiency of the carbon particles.
[0035] It should be noted that a first filter is disposed in the first DPF 1121 , and a second filter is disposed in the second DPF 1131 . Particulate matter in the mixed gas discharged from the exhaust passage 220 is filtered through the first filter and the second filter.
[0036] Furthermore, a radiator 211 is provided on the air intake passage 210 to dissipate heat for the reflux gas in the air intake passage 210 .
[0037] In a feasible embodiment of the present application, Figure 1 As shown, the first branch 112 is provided with a first vent and a second vent at a distal end thereof, the second branch 113 is provided with a third vent and a fourth vent at a distal end thereof, and the first vent is communicated with the third vent.
[0038] Furthermore, the first vent and the third vent are connected via a connecting pipe 114 , and a two-way valve 1141 electrically connected to the controller 140 is provided in the connecting pipe 114 to adjust the ventilation direction in the connecting pipe 114 via the two-way valve 1141 .
[0039] Furthermore, the second vent is connected to the first air outlet pipe 115 , and the fourth vent is connected to the second air outlet pipe 116 .
[0040] Furthermore, a first control valve 1151 electrically connected to the controller 140 is provided on the first air outlet pipe 115 , and a second control valve 1161 electrically connected to the controller 140 is provided on the second air outlet pipe 116 .
[0041] Furthermore, a third air outlet pipe 117 is included, and the distal end of the first air outlet pipe 115 and the distal end of the second air outlet pipe 116 are connected to the air inlet end of the third air outlet pipe 117 .
[0042] Furthermore, a throttle valve 1171 electrically connected to the controller 140 is provided on the third air outlet pipe 117 , and the ventilation flow in the third air outlet pipe 117 is adjusted by the throttle valve 1171 .
[0043] Please refer to Figure 1 and Figure 2When the pressure difference between the upstream and downstream of the first DPF 1121 is less than the pressure difference between the upstream and downstream of the second DPF 1131, the controller 140 controls the first directional valve 111 to connect to the first branch 112, controls the second directional valve 118 to connect to the second branch 113, controls the ventilation direction of the two-way valve 1141 from the first ventilation port to the third ventilation port, the first control valve 1151 is opened, and the second control valve 1161 is closed, and the mixed gas discharged from the exhaust passage 220 of the diesel engine 200 is sequentially connected according to the selection of the first directional valve 111. The carbon particles are filtered by the first DPF 1121 of the first branch 112 and then discharged from the first vent and the second vent. Part of the filtered mixed gas enters the second branch 113 through the connecting pipe 114, and carries the carbon particles in the second DPF 1131 through the loop connected to the second directional valve 118 and flows into the diesel engine 200 through the intake channel 210. The particulate matter is burned by the diesel engine 200 to reduce the exhaust emissions of the diesel engine 200, and part of the filtered mixed gas is discharged through the first outlet pipe 115 and the third outlet pipe 117 in sequence.
[0044] It should be noted that when the airflow entering the second branch 113 through the connecting pipe 114 is small, the throttle valve 1171 is controlled by the controller 140 to reduce the ventilation flow in the third outlet pipe 117 to ensure that the carbon particles in the second DPF 1131 flow into the diesel engine 200 through the loop connected to the second directional valve 118 via the intake passage 210.
[0045] Please refer to Figure 1 and Figure 3 When the pressure difference between the upstream and downstream of the first DPF 1121 is greater than the pressure difference between the upstream and downstream of the second DPF 1131, the controller 140 controls the first directional valve 111 to connect to the second branch 113, controls the second directional valve 118 to connect to the first branch 112, controls the ventilation direction of the two-way valve 1141 from the third vent to the first vent, the second control valve 1161 is opened, and the first control valve 1151 is closed. The mixed gas discharged from the exhaust passage 220 of the diesel engine 200 is sequentially connected to the second branch 113 according to the selection of the first directional valve 111. The carbon particles are filtered by the second DPF 1131 of the second branch 113 and then discharged from the third and fourth vents. After a portion of the filtered mixed gas enters the first branch 112 through the connecting pipe 114, it carries the carbon particles in the first DPF 1121 and flows into the diesel engine 200 through the intake passage 210 through the loop connected by the second directional valve 118. The particulate matter is burned by the diesel engine 200, thereby improving the treatment efficiency of the carbon particles. The portion of the filtered mixed gas is discharged through the second outlet pipe 116 and the third outlet pipe 117 in sequence.
[0046] It should be noted that when the airflow entering the first branch 112 through the connecting pipe 114 is small, the throttle valve 1171 is controlled by the controller 140 to reduce the ventilation flow in the third outlet pipe 117 to ensure that the carbon particles in the first DPF 1121 flow into the diesel engine 200 through the loop connected to the second directional valve 118 via the intake passage 210.
[0047] The above description is only the preferred embodiment of the present application and is not intended to limit the present application. For those skilled in the art, the present application may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.
Claims
1. A diesel engine aftertreatment device, characterized in that: A post-processing pipeline is provided, with two ends respectively connected to an intake channel and an exhaust channel of a diesel engine; a first branch and a second branch are provided in parallel on a pipeline in a discharge direction of the exhaust channel through a first directional valve; a first DPF is provided on the first branch, a second DPF is provided on the second branch, the first branch and the second branch are connected at their far ends, and the first branch and the second branch are connected to the intake channel through a second directional valve on the loops; a first pressure sensor is provided respectively upstream and downstream of the first DPF, and a second pressure sensor is provided respectively upstream and downstream of the second DPF; the first pressure sensor and the second pressure sensor as well as the first directional valve and the second directional valve are respectively electrically connected to a controller; The mixed gas discharged from the exhaust passage of the diesel engine passes through the first DPF of the first branch and the second DPF of the second branch in sequence according to the selection of the first directional valve, and then flows into the diesel engine through the intake passage through the loop connected by the second directional valve.
2. The diesel engine aftertreatment device according to claim 1, characterized in that: When the first directional valve selects to connect the first branch, the second directional valve selects to connect the circuit of the second branch; when the first directional valve selects to connect the second branch, the second directional valve selects to connect the circuit of the first branch.
3. The diesel engine aftertreatment device according to claim 1, characterized in that: The first branch is provided with a first vent and a second vent at a distal end thereof, the second branch is provided with a third vent and a fourth vent at a distal end thereof, and the first vent is communicated with the third vent.
4. The diesel engine aftertreatment device according to claim 3, characterized in that: The first vent and the third vent are communicated with each other through a connecting pipe, and a two-way valve electrically connected to a controller is arranged in the connecting pipe so as to adjust the ventilation direction in the connecting pipe through the two-way valve.
5. The diesel engine aftertreatment device according to claim 3, characterized in that: The second vent is connected to a first air outlet pipe, and the fourth vent is connected to a second air outlet pipe.
6. The diesel engine aftertreatment device according to claim 5, characterized in that: The first air outlet pipe is provided with a first control valve electrically connected to the controller, and the second air outlet pipe is provided with a second control valve electrically connected to the controller.
7. The diesel engine aftertreatment device according to claim 6, characterized in that: It also includes a third air outlet pipe, and the distal end of the first air outlet pipe, the distal end of the second air outlet pipe and the air inlet end of the third air outlet pipe are connected.
8. The diesel engine aftertreatment device according to claim 7, characterized in that: The third air outlet pipe is provided with a throttle valve electrically connected to the controller, and the ventilation flow in the third air outlet pipe is adjusted by the throttle valve.
9. The diesel engine aftertreatment device according to claim 1, characterized in that: A first filter is disposed in the first DPF, and a second filter is disposed in the second DPF. Carbon particles in the mixed gas discharged from the exhaust passage are filtered through the first filter and the second filter.
10. The diesel engine aftertreatment device according to claim 1, characterized in that: A radiator is also arranged on the air intake passage.