CN211058886U

CN211058886U - DPF regeneration control system based on dual-fuel technology

Info

Publication number: CN211058886U
Application number: CN201921662497.8U
Authority: CN
Inventors: 刘军桓; 杨军; 孙平; 王乐健; 吴鹏程; 刘增光
Original assignee: Jiangsu University
Current assignee: Jiangsu University
Priority date: 2019-09-30
Filing date: 2019-09-30
Publication date: 2020-07-21
Anticipated expiration: 2029-09-30

Abstract

The utility model provides a DPF regeneration control system based on dual fuel technology relates to engine exhaust and handles technical field. The system comprises an alcohol and diesel dual-fuel engine, an alcohol nozzle, a diesel nozzle, an ECU, a DPF, a pressure sensor behind the DPF, an internal temperature sensor inside the DPF, a pressure sensor before the DPF, a DOC, a temperature sensor behind the DOC and a temperature sensor before the DOC. The sensor, the alcohol nozzle and the diesel nozzle are all connected with the ECU, and the DPF is an active DPF regeneration device. The alcohol nozzle and the diesel nozzle are used for the control system for DPF regeneration, so that the proportion of dual-fuel injection amount can be adjusted in real time, the content of HC and CO in exhaust gas is increased, and the active DPF regeneration device can efficiently realize regeneration through DOC treatment.

Description

DPF regeneration control system based on dual-fuel technology

Technical Field

The utility model belongs to the technical field of the diesel engine tail gas aftertreatment, specifically, relate to a DPF regeneration control system based on dual fuel technology.

Background

As an internal combustion engine different from a gasoline engine, the diesel engine has better economical efficiency and high thermal efficiency and is widely applied to every corner of industry, agriculture and daily life. However, the huge holding capacity of diesel vehicles also causes environmental problems, and carbon monoxide (CO), Hydrocarbon (HC), nitrogen oxide (NOx), and Particulate Matter (PM) in the emissions may pose certain hazards to the environment and humans. The organic soluble components and polycyclic aromatic hydrocarbon in the PM have certain carcinogenicity, and the inhalation of the PM can increase the mechanical composition of human lungs and cause harm to human hearts and respiratory systems. NOx is a main factor causing acid rain and photochemical smog, and can enter the lung of a human body through breathing to react with water to generate nitrous acid and nitric acid, so that strong stimulation and corrosion effects are generated on lung tissues, and the permeability of capillaries and alveolar walls is increased to cause pulmonary edema. Therefore, control of diesel emissions is imperative.

Diesel Particulate Filter (DPF) is one of the most common off-board purification technologies currently used to reduce PM, and the PM trapping efficiency can reach over 90%. However, during the process of trapping the DPF, a large amount of PM may accumulate, causing clogging of the DPF, which in turn increases the exhaust back pressure and affects the normal operation of the engine. Therefore, in order to improve the practicability of the DPF, the DPF must be regenerated at a proper time.

Currently, the common DPF regeneration techniques can be classified into passive regeneration and active regeneration. The principle of the method is that the temperature of the active regeneration system is increased to the combustion temperature of the particles through an external heating source, so that the particles react with oxygen in tail gas and the like to remove the particles, and the purpose of regeneration is achieved.

SUMMERY OF THE UTILITY MODEL

Exist not enoughly among the prior art, the utility model provides a DPF regeneration control system based on dual fuel technology utilizes HC and CO in the Oxidation catalytic Converter (Diesel Oxidation Converter, DOC) Oxidation tail gas to further promote and make exhaust temperature to make DPF reach the light-off temperature, effectual realization regeneration process.

To achieve the above object, the present invention adopts the following embodiments:

a DPF regeneration control system based on dual-fuel technology comprises an alcohol and diesel dual-fuel engine, an alcohol nozzle, a diesel nozzle, an ECU, a DPF rear pressure sensor, a DPF inner temperature sensor, a DPF front pressure sensor, a DOC rear temperature sensor and a DOC front temperature sensor;

the exhaust pipe of the alcohol and diesel dual-fuel engine is sequentially provided with a DOC and a DPF;

the DPF internal temperature sensor is positioned inside the DPF;

the DPF front pressure sensor and the DPF rear pressure sensor are respectively arranged on the exhaust pipes in front of and behind the DPF and are connected with the ECU;

the DOC front temperature sensor and the DOC rear temperature sensor are respectively arranged on the exhaust pipes in front of and behind the DOC;

the alcohol and diesel dual-fuel engine is provided with an inlet valve, a diesel nozzle and an exhaust valve;

the alcohol nozzle, the diesel nozzle and the alcohol and diesel dual-fuel engine are all connected with the ECU.

Furthermore, the ECU is also connected with an electronic controller of the whole vehicle.

Further, the alcohol nozzle is located on an intake manifold of an alcohol and diesel dual fuel engine.

Further, the alcohol nozzle is connected with an alcohol fuel tank, a valve and an injection amount control device are arranged on a pipeline between the alcohol nozzle and the alcohol fuel tank, and the injection amount control device is connected with the ECU.

Further, the DPF is an active DPF regeneration device.

The utility model discloses an advantage reaches and is showing the effect:

the utility model discloses a novel DPF regeneration control system and method that provide on the basis of dual fuel technique utilizes the engine HC and the higher characteristics of CO emission when burning with dual fuel, uses HC and CO in the oxidation catalytic converter DOC oxidation tail gas to further promote and make exhaust temperature to make DPF reach the temperature of initiating combustion, effectual realization DPF regeneration process. Judging the time for entering the dual-fuel mode from the pure diesel mode by means of the pressure drop calculated by the pressure sensors at the two ends of the DPF; according to the fuel injection control, the ECU calculates the injection quantity of two fuels to be adjusted according to the information of the current working condition of the engine, the exhaust temperature, the internal temperature of the DPF and the like; the regeneration protection control method is to control the internal temperature of the DPF by adjusting the ratio of two fuels, so as to prevent the DPF from being damaged due to overheating. In order to facilitate the application of the dual fuel technology, the engine is modified to provide an injection environment for the second fuel, and a nozzle is arranged on the air inlet manifold. The DPF regeneration control method belongs to active regeneration and has better reliability and controllability.

Drawings

The invention will be further explained with reference to the drawings and the specific embodiments.

Fig. 1 is a structural diagram of a novel DPF regeneration control system according to the present invention.

The reference numerals are as follows:

1. an intake valve; 2. an alcohol nozzle; 3. a diesel nozzle; 4. an exhaust valve; 5. an ECU; 6. an electronic controller; 8. a DPF; 7. A post-DPF pressure sensor; 9. a DPF internal temperature sensor; 10. a DPF front pressure sensor; 12. a DOC; 11. a DOC rear temperature sensor; 13. an exhaust gas temperature sensor; 14. alcohol and diesel dual fuel engines.

Detailed Description

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

As shown in fig. 1, DPF regeneration control system based on dual fuel technology, including mellow wine diesel oil dual fuel engine 14, mellow wine nozzle 2, diesel nozzle 3, ECU5, DPF8, pressure sensor 7 behind the DPF, the inside temperature sensor 9 of DPF, pressure sensor 10 before the DPF, DOC12, temperature sensor 11 behind the DOC and temperature sensor 13 before the DOC.

The alcohol and diesel dual-fuel engine 14 is provided with an inlet valve 1 and an exhaust valve 4, the exhaust valve 4 of the alcohol and diesel dual-fuel engine 14 is connected with an exhaust pipe, and the exhaust pipe of the alcohol and diesel dual-fuel engine 14 is sequentially provided with a DOC12 and a DPF 8; the DPF internal temperature sensor 9 is inside the DPF 8; the DPF front pressure sensor 10 and the DPF rear pressure sensor 7 are respectively arranged on the exhaust pipes in front of and behind the DPF8 and are connected with the ECU 5; the temperature sensor 13 before the DOC and the temperature sensor 11 after the DOC are respectively arranged on the exhaust pipes before and after the DOC 12.

The two fuel nozzles of the alcohol and diesel dual fuel engine 14 are the alcohol nozzle 2 and the diesel nozzle 3, respectively. The alcohol nozzle 2 is located on the intake manifold of an alcohol and diesel dual fuel engine 14. The alcohol nozzle 2 is connected to an alcohol fuel tank, and a valve and an injection amount control device connected to the ECU5 are provided on a pipe between the alcohol nozzle 2 and the alcohol fuel tank. The diesel nozzle 3 and the alcohol and diesel dual fuel engine 14 are connected to an ECU 5.

Preferably, the ECU5 is further connected to the electronic controller 6 of the entire vehicle, and is configured to obtain the operating condition of the engine 14 in real time as a basis for the decision-making of the ECU 5.

Preferably, the ECU5 receives feedback signals from the DPF rear pressure sensor 7, the DPF internal temperature sensor 9, the DPF front pressure sensor 10, the DOC rear temperature sensor 11, and the DOC front temperature sensor 13. The decision of dual fuel injection is made according to the received internal temperature when the DPF8 is regenerated, the pressure before and after the DPF8, and the temperature before and after the DOC12, and the operation of the alcohol nozzle 2, the diesel nozzle 3, and the alcohol and diesel dual fuel engine 14 is controlled. The fuel injected by the alcohol nozzle 2 and the diesel nozzle 3 is carried into the cylinder by air to participate in combustion; the oxidation catalytic converter DOC12 is arranged behind an engine exhaust pipe and in front of the DPF8 and used for combusting HC and CO in exhaust gas, so that the aim of improving the exhaust temperature is fulfilled, and a temperature environment suitable for DPF8 regeneration is created.

Specific example 1:

the alcohol and diesel dual-fuel engine 14 is in and maintains a pure diesel injection mode, the alcohol nozzle 2 is closed, air enters the alcohol and diesel dual-fuel engine 14 through the air inlet valve 1, is discharged from the exhaust valve 4, and is discharged out of the system after sequentially passing through the DOC12 and the DPF 8; the ECU5 monitors the pressure difference between two ends of the DPF8 through the DPF front pressure sensor 10 and the DPF rear pressure sensor 7, and compares the pressure difference with the upper limit threshold value of the pressure difference prestored in the ECU5 to judge whether the DPF8 needs to be regenerated; if the pressure difference across the DPF8 is detected to be less than the upper pressure difference threshold value, the alcohol and diesel dual-fuel engine 14 continues to be in and maintain the pure diesel injection mode; if the pressure difference between two ends of the DPF8 is larger than the upper limit threshold value of the pressure difference, the ECU5 sends signals to the alcohol nozzle 2 and the diesel nozzle 3 to enable the alcohol and diesel dual-fuel engine 14 to enter a dual-fuel working mode, the temperature inside the DPF8 reaches the regeneration temperature by adjusting the injection quantity proportion of the alcohol and the diesel to regenerate the DPF8, meanwhile, the temperature inside the DOC12 is guaranteed to be suitable for the oxidation treatment of HC and CO, and the dual-fuel working mode is stopped until the pressure difference between two ends of the DPF8 is smaller than the upper limit threshold value of the pressure difference, and the pure diesel injection mode.

This DPF regeneration controlling means belongs to the initiative regenerating unit, the inside temperature of ratio control DPF through adjusting two kinds of fuel of regeneration protection control's method, working mode is rationally selected according to the operating mode of engine, prevent that the DPF from destroying because of overheated, real time monitoring device inside temperature takes corresponding measure, can prevent to cause adverse effect because of the high temperature or cross low, this method and device have combined DOC, utilize the engine HC and CO emission higher characteristics when burning dual fuel, HC and CO in the oxidation tail gas of oxidation catalytic converter DOC further promote and make exhaust temperature, thereby make the DPF reach the ignition temperature, effectual realization DPF regeneration process. The DPF can be efficiently regenerated.

The embodiment is a preferred embodiment of the present invention, but the present invention is not limited to the above embodiment, and any obvious improvement, replacement or modification which can be made by those skilled in the art without departing from the essence of the present invention belongs to the protection scope of the present invention.

Claims

1. A DPF regeneration control system based on a dual-fuel technology is characterized by comprising an alcohol and diesel dual-fuel engine (14), an alcohol nozzle (2), a diesel nozzle (3), an ECU (5), a DPF (8), a DPF rear pressure sensor (7), a DPF inner temperature sensor (9), a DPF front pressure sensor (10), a DOC (12), a DOC rear temperature sensor (11) and a DOC front temperature sensor (13);

a DOC (12) and a DPF (8) are sequentially arranged on an exhaust pipe of the alcohol and diesel dual-fuel engine (14);

the DPF internal temperature sensor (9) is positioned inside the DPF (8);

the DPF front pressure sensor (10) and the DPF rear pressure sensor (7) are respectively arranged on the exhaust pipes in front of and behind the DPF (8) and are connected with the ECU (5);

the DOC front temperature sensor (13) and the DOC rear temperature sensor (11) are respectively arranged on the exhaust pipes in front of and behind the DOC (12) and are connected with the ECU (5);

the alcohol and diesel dual-fuel engine (14) is provided with an intake valve (1), a diesel nozzle (3) and an exhaust valve (4);

the alcohol nozzle (2), the diesel nozzle (3) and the alcohol and diesel dual-fuel engine (14) are connected with the ECU (5).

2. DPF regeneration control system based on dual fuel technology according to claim 1, characterized in that said ECU (5) is also connected with the electronic controller (6) of the whole vehicle.

3. The DPF regeneration control system based on dual fuel technology of claim 1, characterized in that the alcohol nozzle (2) is located on the intake manifold of an alcohol and diesel dual fuel engine (14).

4. DPF regeneration control system based on dual fuel technology according to claim 3, characterized in that the alcohol nozzle (2) is connected to the alcohol fuel tank, on the pipe between the alcohol nozzle (2) and the alcohol fuel tank there are valves and injection quantity control means, said injection quantity control means being connected to the ECU (5).

5. The dual fuel technology based DPF regeneration control system of claim 1, wherein the DPF (8) is an active DPF regeneration device.